33 results on '"Renxiang Li"'
Search Results
2. Head pose tracking and gesture detection using block motion vectors on mobile devices.
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Renxiang Li, Cüneyt M. Taskiran, and Mike Danielsen
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- 2007
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3. Transcriptome analysis reveals the key role of overdominant expression of photosynthetic and respiration-related genes in the formation of tobacco(Nicotiana tabacum L.) biomass heterosis
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Anbin Lu, Shuaibo Zeng, Kai Pi, Benshan Long, Zejun Mo, and Renxiang Liu
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Heterosis ,Tobacco leaves biomass ,Photosynthesis ,Respiration. ,Biotechnology ,TP248.13-248.65 ,Genetics ,QH426-470 - Abstract
Abstract Background Leaves are the nutritional and economic organs of tobacco, and their biomass directly affects tobacco yield and the economic benefits of farmers. In the early stage, our research found that tobacco hybrids have more leaves and larger leaf areas, but the performance and formation reasons of biomass heterosis are not yet clear. Results This study selected 5 parents with significant differences in tobacco biomass and paired them with hybrid varieties. It was found that tobacco hybrid varieties have a common biomass heterosis, and 45 days after transplantation is the key period for the formation of tobacco biomass heterosis; By analyzing the biomass heterosis of hybrids, Va116×GDH94 and its parents were selected for transcriptome analysis. 76.69% of the differentially expressed genes between Va116×GDH94 and its parents showed overdominant expression pattern, and these overdominant expression genes were significantly enriched in the biological processes of photosynthesis and TCA cycle; During the process of photosynthesis, the overdominant up-regulation of genes such as Lhc, Psa, and rbcl promotes the progress of photosynthesis, thereby increasing the accumulation of tobacco biomass; During the respiratory process, genes such as MDH, ACO, and OGDH are overedominantly down-regulated, inhibiting the TCA cycle and reducing substrate consumption in hybrid offspring; The photosynthetic characteristics of the hybrid and its parents were measured, and the net photosynthetic capacity of the hybrid was significantly higher than that of the parents. Conclusion These results indicate that the overdominant expression effect of differentially expressed genes in Va116×GDH94 and its parents plays a crucial role in the formation of tobacco biomass heterosis. The overdominant expression of genes related to photosynthesis and respiration enhances the photosynthetic ability of Va116×GDH94, reduces respiratory consumption, promotes the increase of biomass, and exhibits obvious heterosis.
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- 2024
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4. Towards the Tetrabenzo-Fused Circumazulene via In-Solution and On-Surface Synthesis
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Fupeng Wu, Wangwei Xu, Yubin Fu, Renxiang Liu, Lin Yang, Pascal Ruffieux, Roman Fasel, Ji Ma, and Xinliang Feng
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circumazulene ,nanographenes ,nonalternant ,benzannulation ,in-solution synthesis ,on-surface synthesis ,Chemistry ,QD1-999 - Published
- 2024
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5. Real-Time Multimodal Human-Avatar Interaction.
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Yun Fu 0001, Renxiang Li, Thomas S. Huang, and Mike Danielsen
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- 2008
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6. An arbitrary ratio resizer for MPEG applications.
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Renxiang Li and Sami Levi
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- 2000
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7. Reliable motion detection/compensation for interlaced sequences and its applications to deinterlacing.
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Renxiang Li, Bing Zheng, and Ming L. Liou
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- 2000
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8. Optimization of fast block motion estimation algorithms.
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Bing Zeng, Renxiang Li, and Ming L. Liou
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- 1997
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9. A new three-step search algorithm for block motion estimation.
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Renxiang Li, Bing Zeng, and Ming L. Liou
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- 1994
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10. Genome-wide identification and characterization of Glutathione S-Transferases (GSTs) and their expression profile under abiotic stresses in tobacco (Nicotiana tabacum L.)
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Zejun Mo, Ying Huang, Tianxiunan Pu, Lili Duan, Kai Pi, Jiajun Luo, Benshan Long, Anbin Lu, and Renxiang Liu
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Nicotiana tabacum L. ,GST family ,Characterization ,Expression pattern ,Abiotic stress ,Biotechnology ,TP248.13-248.65 ,Genetics ,QH426-470 - Abstract
Abstract Background Glutathione S-transferases (GSTs) are large and multifunctional proteases that play an important role in detoxification, protection against biotic and abiotic stresses, and secondary metabolite transportation which is essential for plant growth and development. However, there is limited research on the identification and function of NtGSTs. Results This study uses K326 and other six tobacco varieties (Hongda, HG, GDH11, Va116, VG, and GDH88) as materials to conduct comprehensive genome-wide identification and functional characterization of the GST gene in tobacco. A total of 59 NtGSTs were identified and classified into seven subfamilies via the whole-genome sequence analysis, with the Tau type serving as the major subfamily. The NtGSTs in the same branch of the evolutionary tree had similar exon/intron structure and motif constitution. There were more than 42 collinear blocks between tobacco and pepper, tomato, and potato, indicating high homology conservation between them. Twelve segmental duplicated gene pairs and one tandem duplication may have had a substantial impact on the evolution and expansion of the tobacco GST gene family. The RT-qPCR results showed that the expression patterns of NtGSTs varied significantly among tissues, varieties, and multiple abiotic stresses, suggesting that NtGST genes may widely respond to various abiotic stresses and hormones in tobacco, including NtGSTF4, NtGSTL1, NtGSTZ1, and NtGSTU40. Conclusions This study provides a comprehensive analysis of the NtGST gene family, including structures and functions. Many NtGSTs play a critical regulatory role in tobacco growth and development, and responses to abiotic stresses. These findings offer novel and valuable insights for understanding the biological function of NtGSTs and the reference materials for cultivating highly resistant varieties and enhancing the yield and quality of crops.
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- 2023
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11. Overdominant expression of related genes of ion homeostasis improves K+ content advantage in hybrid tobacco leaves
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Kai Pi, Wen Luo, Zejun Mo, Lili Duan, Yuzhou Ke, Pingsong Wang, Shuaibo Zeng, Yin Huang, and Renxiang Liu
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Heterosis ,Tobacco ,Potassium ,Ion homeostasis ,Botany ,QK1-989 - Abstract
Abstract Background Potassium(K+) plays a vital role in improving the quality of tobacco leaves. However, how to improve the potassium content of tobacco leaves has always been a difficult problem in tobacco planting. K+ content in tobacco hybrid is characterized by heterosis, which can improve the quality of tobacco leaves, but its underlying molecular genetic mechanisms remain unclear. Results Through a two-year field experiment, G70×GDH11 with strong heterosis and K326×GDH11 with weak heterosis were screened out. Transcriptome analyses revealed that 80.89% and 57.28% of the differentially expressed genes (DEGs) in the strong and weak heterosis combinations exhibited an overdominant expression pattern, respectively. The genes that up-regulated the overdominant expression in the strong heterosis hybrids were significantly enriched in the ion homeostasis. Genes involved in K+ transport (KAT1/2, GORK, AKT2, and KEA3), activity regulation complex (CBL-CIPK5/6), and vacuole (TPKs) genes were overdominant expressed in strong heterosis hybrids, which contributed to K+ homeostasis and heterosis in tobacco leaves. Conclusions K+ homeostasis and accumulation in tobacco hybrids were collectively improved. The overdominant expression of K+ transport and homeostasis-related genes conducted a crucial role in the heterosis of K+ content in tobacco leaves.
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- 2022
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12. Genome-wide identification and expression analysis of the ftsH protein family and its response to abiotic stress in Nicotiana tabacum L
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Tianxiunan Pu, Zejun Mo, Long Su, Jing Yang, Ke Wan, Linqi Wang, Renxiang Liu, and Yang Liu
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FtsH family ,Gene expression patterns ,Abiotic stress ,Biotechnology ,TP248.13-248.65 ,Genetics ,QH426-470 - Abstract
Abstract Background The filamentous temperature-sensitive H protease (ftsH) gene family plays an important role in plant growth and development. FtsH proteins belong to the AAA protease family. Studies have shown that it is a key gene for plant chloroplast development and photosynthesis regulation. In addition, the ftsH gene is also involved in plant response to stress. At present, the research and analysis of the ftsH gene family are conducted in microorganisms such as Escherichia coli and Oenococcus and various plants such as Arabidopsis, pear, rice, and corn. However, analysis reports on ftsH genes from tobacco (Nicotiana tabacum L.), an important model plant, are still lacking. Since ftsH genes regulate plant growth and development, it has become necessary to systematically study this gene in an economically important plant like tobacco. Results This is the first study to analyze the ftsH gene from Nicotiana tabacum L. K326 (NtftsH). We identified 20 ftsH genes from the whole genome sequence, renamed them according to their chromosomal locations, and divided them into eight subfamilies. These 20 NtftsH genes were unevenly distributed across the 24 chromosomes. We found four pairs of fragment duplications. We further investigated the collinearity between these genes and related genes in five other species. Quantitative real-time polymerase chain reaction (qRT-PCR) analysis identified differential expression patterns of NtftsH in different tissues and under various abiotic stress conditions. Conclusions This study provides a comprehensive analysis of the NtftsH gene family. The exon–intron structure and motif composition are highly similar in NtftsH genes that belong to the same evolutionary tree branch. Homology analysis and phylogenetic comparison of ftsH genes from several different plants provide valuable clues for studying the evolutionary characteristics of NtftsH genes. The NtftsH genes play important roles in plant growth and development, revealed by their expression levels in different tissues as well as under different stress conditions. Gene expression and phylogenetic analyses will provide the basis for the functional analysis of NtftsH genes. These results provide a valuable resource for a better understanding of the biological role of the ftsH genes in the tobacco plant.
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- 2022
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13. Genome-wide identification and expression analysis of the bZIP transcription factor family genes in response to abiotic stress in Nicotiana tabacum L.
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Lili Duan, Zejun Mo, Yue Fan, Kuiyin Li, Mingfang Yang, Dongcheng Li, Yuzhou Ke, Qian Zhang, Feiyan Wang, Yu Fan, and Renxiang Liu
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bZIP family ,Nicotiana tabacum L. ,Gene expression patterns ,Abiotic stress ,Biotechnology ,TP248.13-248.65 ,Genetics ,QH426-470 - Abstract
Abstract Background The basic leucine zipper (bZIP) transcription factor (TF) is one of the largest families of transcription factors (TFs). It is widely distributed and highly conserved in animals, plants, and microorganisms. Previous studies have shown that the bZIP TF family is involved in plant growth, development, and stress responses. The bZIP family has been studied in many plants; however, there is little research on the bZIP gene family in tobacco. Results In this study, 77 bZIPs were identified in tobacco and named NtbZIP01 through to NtbZIP77. These 77 genes were then divided into eleven subfamilies according to their homology with Arabidopsis thaliana. NtbZIPs were unevenly distributed across twenty-two tobacco chromosomes, and we found sixteen pairs of segmental duplication. We further studied the collinearity between these genes and related genes of six other species. Quantitative real-time polymerase chain reaction analysis identified that expression patterns of bZIPs differed, including in different organs and under various abiotic stresses. NtbZIP49 might be important in the development of flowers and fruits; NtbZIP18 might be an important regulator in abiotic stress. Conclusions In this study, the structures and functions of the bZIP family in tobacco were systematically explored. Many bZIPs may play vital roles in the regulation of organ development, growth, and responses to abiotic stresses. This research has great significance for the functional characterisation of the tobacco bZIP family and our understanding of the bZIP family in higher plants.
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- 2022
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14. Real-Time Multimodal Human–Avatar Interaction
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T.S. Huang, M. Danielsen, Renxiang Li, and Yun Fu
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business.industry ,Computer science ,Animation ,Viseme ,Facial recognition system ,Rendering (computer graphics) ,Motion estimation ,Media Technology ,Visual communication ,Computer vision ,Artificial intelligence ,Electrical and Electronic Engineering ,User interface ,business ,Face detection ,Mobile device ,Computer animation ,Computer facial animation - Abstract
This paper presents a novel real-time multimodal human-avatar interaction (RTM-HAI) framework with vision-based remote animation control (RAC). The framework is designed for both mobile and desktop avatar-based human-machine or human-human visual communications in real-world scenarios. Using 3-D components stored in the Java mobile 3-D (M3G) file format, the avatar models can be flexibly constructed and customized on the fly on any mobile devices or systems that support the M3G standard. For the RAC head tracker, we propose a 2-D real-time face detection/tracking strategy through an interactive loop, in which the detection and tracking complement each other for efficient and reliable face localization, tolerating extreme user movement. With the face location robustly tracked, the RAC head tracker selects a main user and estimates the user's head rolling, tilting, yawing, scaling, horizontal, and vertical motion in order to generate avatar animation parameters. The animation parameters can be used either locally or remotely and can be transmitted through socket over the network. In addition, it integrates audio-visual analysis and synthesis modules to realize multichannel and runtime animations, visual TTS and real-time viseme detection and rendering. The framework is recognized as an effective design for future realistic industrial products of humanoid kiosk and human-to-human mobile communication.
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- 2008
15. Overdominant expression of genes plays a key role in root growth of tobacco hybrids
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Kai Pi, Ying Huang, Wen Luo, Shuaibo Zeng, Zejun Mo, Lili Duan, and Renxiang Liu
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heterosis ,overdominant expression ,root system ,transcriptomics ,WGCNA ,Plant culture ,SB1-1110 - Abstract
Heterosis has greatly improved the yield and quality of crops. However, previous studies often focused on improving the yield and quality of the shoot system, while research on the root system was neglected. We determined the root numbers of 12 F1 hybrids, all of which showed strong heterosis, indicating that tobacco F1 hybrids have general heterosis. To understand its molecular mechanism, we selected two hybrids with strong heterosis, GJ (G70 × Jiucaiping No.2) and KJ (K326 × Jiucaiping No.2), and their parents for transcriptome analysis. There were 84.22% and 90.25% of the differentially expressed genes were overdominantly expressed. The enrichment analysis of these overdominantly expressed genes showed that “Plant hormone signal transduction”, “Phenylpropanoid biosynthesis”, “MAPK signaling pathway - plant”, and “Starch and sucrose metabolism” pathways were associated with root development. We focused on the analysis of the biosynthetic pathways of auxin(AUX), cytokinins(CTK), abscisic acid(ABA), ethylene(ET), and salicylic acid(SA), suggesting that overdominant expression of these hormone signaling pathway genes may enhance root development in hybrids. In addition, Nitab4.5_0011528g0020、Nitab4.5_0003282g0020、Nitab4.5_0004384g0070 may be the genes involved in root growth. Genome-wide comparative transcriptome analysis enhanced our understanding of the regulatory network of tobacco root development and provided new ideas for studying the molecular mechanisms of tobacco root development.
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- 2023
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16. Fast motion estimation algorithms for video encoding and deinterlacing
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Renxiang Li
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- 2014
17. Effect of the over-dominant expression of proteins on nicotine heterosis via proteomic analysis
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Zejun Mo, Yuanyuan Pu, Junhao Zhou, Zonglin Tian, Jianhui Teng, Qian Chen, Lili Duan, and Renxiang Liu
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Medicine ,Science - Abstract
Abstract Heterosis is a common biological phenomenon that can be used to optimize yield and quality of crops. Using heterosis breeding, hybrids with suitable nicotine content have been applied to tobacco leaf production. However, the molecular mechanism of the formation of nicotine heterosis has never been explained from the perspective of protein. The DIA proteomics technique was used to compare the differential proteomics of the hybrid Va116 × Basma, showing strong heterosis in nicotine content from its parent lines Va116 and Basma. Proteomics analysis indicated that 65.2% of DEPs showed over-dominant expression patterns, and these DEPs included QS, BBL, GS, ARAF and RFC1 which related to nicotine synthesis. In addition, some DEPs (including GST, ABCE2 and ABCF1 and SLY1) that may be associated with nicotinic transport exhibited significant heterosis over the parental lines. These findings demonstrated that the efficiency of the synthesis and transport of nicotine in hybrids was significantly higher than that in the parent lines, and the accumulation of over-dominant expression proteins may be the cause of heterosis of nicotinic content in hybrids.
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- 2021
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18. Reliable motion detection/compensation for interlaced sequences and its applications to deinterlacing
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Bing Zheng, M.L. Liou, and Renxiang Li
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Motion compensation ,Signal processing ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Motion detection ,Image processing ,law.invention ,Quarter-pixel motion ,law ,Deinterlacing ,Interlaced video ,Motion estimation ,Media Technology ,Computer vision ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,Mathematics - Abstract
We present a new method for the motion detection/compensation between opposite parity fields in interlaced video sequences. We introduce a phase-correction filter, which is applied to one type (even or odd) of fields before motion detection/compensation. By means of this phase-correction filter, the motion-compensated PSNR has been improved by more than 2 dB, on average. We also present a new deinterlacing algorithm based on the newly developed motion detection/compensation. This algorithm requires storing one field only, and the phase-corrected field is used for both motion detection/compensation and intrafield deinterlacing, thus making the proposed algorithm computationally very efficient. Excellent deinterlacing results have been obtained.
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- 2000
19. Comparative transcriptome analysis between inbred lines and hybrids provides molecular insights into K+ content heterosis of tobacco (Nicotiana tabacum L.)
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Zejun Mo, Wen Luo, Kai Pi, Lili Duan, Pingsong Wang, Yuzhou Ke, Shuaibo Zeng, Rongli Jia, Ting Liang, Ying Huang, and Renxiang Liu
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potassium ,heterosis ,transcriptomics ,Nicotiana tabacum ,quality ,Plant culture ,SB1-1110 - Abstract
Potassium (K+) is essential for crop growth. Increasing the K+ content can often directly promote the improvement of crop yield and quality. Heterosis plays an important role in genetic improvement and leads to genetic gains. We found that the K+ content of tobacco showed significant heterosis, which is highly significant for cultivating tobacco varieties with high K+ content. However, the mechanism by which K+ content heterosis occurs in tobacco leaves is not clear. In this study, a comprehensive comparative transcriptome sequencing analysis of root samples from the hybrid G70 × GDH11 and its parental inbred lines G70 and GDH11 was performed to elucidate the importance of the root uptake capacity of K+ in the formation of heterosis. The results showed that 29.53% and 60.49% of the differentially expressed genes (DEGs) exhibited dominant and over-dominant expression patterns, respectively. These non-additive upregulated DEGs were significantly enriched in GO terms, such as metal ion transport and reaction, ion balance and homeostasis, ion channel activity, root meristem growth, and regulation of root hairs. The KEGG annotation results indicated that these genes were mainly involved in the pathways such as energy metabolism, carbohydrate formation, amino acid metabolism, and signal transduction. Further analysis showed that probable potassium transporter 17 (NtKT17) and potassium transporter 5-like (NtKT5), associated with potassium ion absorption, glutamate receptor 2.2-like and glutamate receptor 2.8-like, associated with ion channel activity, LOC107782957, protein detoxification 42-like, and probable glutamate carboxypeptidase 2, associated with root configuration, showed a significantly higher expression in the hybrids. These results indicated that the over-dominant expression pattern of DEGs played a key role in the heterosis of K+ content in tobacco leaves, and the overexpression of the genes related to K+ uptake, transport, and root development in hybrids helped to improve the K+ content of plants, thus showing the phenomenon of heterosis.
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- 2022
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20. Optimization of fast block motion estimation algorithms
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Renxiang Li, Bing Zeng, and M.L. Liou
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Optimization problem ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Motion vector ,Quarter-pixel motion ,Motion field ,Robustness (computer science) ,Search algorithm ,Motion estimation ,Media Technology ,Computer vision ,Algorithm design ,Artificial intelligence ,Electrical and Electronic Engineering ,business ,Algorithm ,Mathematics - Abstract
There are basically three approaches for carrying out fast block motion estimation: (1) fast search by a reduction of motion vector candidates; (2) fast block-matching distortion (BMD) computation; and (3) motion field subsampling. The first approach has been studied more extensively since different ways of reducing motion vector candidates may result in significantly different performance; while the second and third approaches can in general be integrated into the first one so as to further accelerate the estimation process. In this paper, we first formulate the design of good fast estimation algorithms based on motion vector candidate reduction into an optimization problem that involves the checking point pattern (CPP) design via minimizing the distance from the true motion vector to the closest checking point (DCCP). Then, we demonstrate through extensive studies on the statistical behavior of real-world motion vectors that the DCCP minimization can result in fast search algorithms that are very efficient as well as highly robust. To further utilize the spatiotemporal correlation of motion vectors, we develop an adaptive search scheme and a hybrid search idea that involves a fixed CPP and a variable CPP. Simulations are performed to confirm their advantages over conventional fast search algorithms.
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- 1997
21. A flexible display module for DVD and set-top box applications
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Renxiang Li, K.T. Mo, N.K. Chung, D.M. Fisher, and Vena Wong
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Upsampling ,Signal processing ,NTSC ,Flexible display ,Computer science ,business.industry ,Computer graphics (images) ,Media Technology ,Window (computing) ,Digital television ,Electrical and Electronic Engineering ,business ,Aspect ratio (image) - Abstract
This paper presents a flexible, multi-mode display module for DVD and set-top box (STB) applications. The display module features: (1) vertical/horizontal post processing for chroma upsampling and rate conversions; (2) aspect ratio conversion for displaying 16:9 or 4:3 decoded pictures on either 16:9 or 4:3 devices; (3) user programmable, window based display with half or double window resizing; (4) sub-picture mixing and OSD overlay. All these functions are supported for both interlaced and progressive picture formats for PAL as well as NTSC systems.
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- 1997
22. Proteomics and Co-expression Network Analysis Reveal the Importance of Hub Proteins and Metabolic Pathways in Nicotine Synthesis and Accumulation in Tobacco (Nicotiana tabacum L.)
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Zejun Mo, Lili Duan, Yuanyuan Pu, Zonglin Tian, Yuzhou Ke, Wen Luo, Kai Pi, Ying Huang, Qiong Nie, and Renxiang Liu
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nicotine ,proteomics ,weighted gene co-expression network analysis ,metabolites ,enzyme activity ,Nicotiana tabacum ,Plant culture ,SB1-1110 - Abstract
Nicotine is a unique alkaloid present in tobacco that is widely used in cigarettes and in the agricultural, chemical, and pharmaceutical industries. However, the research on nicotine is mostly limited to its synthesis pathways, and only a few studies have explored the effects of other metabolic pathways on nicotine precursors. Regulating the nicotine content in tobacco can greatly promoting the application of nicotine in other fields. In this study, we performed global data-independent acquisition proteomics analysis of four tobacco varieties. Of the four varieties, one had high nicotine content and three had a low nicotine content. A total of 31,259 distinct peptides and 6,018 proteins across two samples were identified. A total of 45 differentially expressed proteins (DEPs) co-existed in the three comparison groups and were mainly involved in the transport and metallic processes of the substances. Most DEPs were enriched in the biosynthesis of secondary metals, glutathione metabolism, carbon metabolism, and glycolysis/gluconeogenesis. In addition, the weighted gene co-expression network analysis identified an expression module closely related to the nicotine content (Brown, r = 0.74, P = 0.006). Gene Ontology annotation and Kyoto Encyclopaedia of Genes and Genomes enrichment analysis showed that the module proteins were mainly involved in the synthesis and metabolism of nicotine precursors such as arginine, ornithine aspartate, proline, and glutathione. The increased levels of these precursors lead to the synthesis and accumulation of nicotine in plants. More importantly, these proteins regulate nicotine synthesis by affecting the formation of putrescine, which is the core intermediate product in nicotine anabolism. Our results provide a reference for tobacco variety selection with a suitable nicotine content and regulation of the nicotine content. Additionally, the results highlight the importance of other precursor metabolism in nicotine synthesis.
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- 2022
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23. Data Hiding with Tree Based Parity Check
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C.K.M. Yuk, Oscar C. Au, Renxiang Li, K.K. Lai, and Sui-Yuk Lam
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Computer science ,Distortion ,Information hiding ,Data mining ,computer.software_genre ,Host (network) ,computer ,Digital watermarking ,Parity bit ,Image (mathematics) - Abstract
In this paper, we propose a novel algorithm namely tree based parity check (TBPC) that can be applied to most of the existing data hiding algorithms to achieve improvement in visual quality. In data hiding process, distortion is created when the original image is modified. Most existing data hiding algorithms try to minimize the visual artifacts introduced by the modifications. The proposed algorithm tries to reduce the probability of modifying the original host image. Theoretical analysis and experimental results are given in this paper. Both measures suggest that an improvement in visual quality is achieved in the watermarked image.
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- 2007
24. Real-Time Humanoid Avatar for Multimodal Human-Machine Interaction
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Yun Fu, Renxiang Li, Thomas S. Huang, and M. Danielsen
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Computer science ,business.industry ,Mobile computing ,Animation ,Viseme ,Rendering (computer graphics) ,Human machine interaction ,Motion estimation ,Computer vision ,Artificial intelligence ,User interface ,business ,Computer animation ,Avatar - Abstract
A novel framework of multimodal human-machine or human-human interaction via real-time humanoid avatar communication is proposed for real-world mobile application. It integrates audio-visual analysis and synthesis modules to realize real-time head tracking, multichannel and runtime animations, visual TTS and real-time viseme detection and rendering. The 3D avatar provides customized modeling for low-bit rate virtual communication by adopting M3G standard and supports MPEG-4 FAPs. A robust user head tracker and the associated head pose and motion estimation scheme are developed for real-time avatar animation control at remote locations. The framework is recognized as an effective design for realistic industrial products of human-to-human mobile communication.
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- 2007
25. Halftone Image Data Hiding with Block-Overlapping Parity Check
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C.K.M. Yuk, Shu-Kei Yip, Sui-Yuk Lam, Renxiang Li, and Oscar C. Au
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Halftone ,Pixel ,Computer science ,Information hiding ,Watermark ,Data mining ,computer.software_genre ,computer ,Grayscale ,Digital watermarking ,Algorithm ,Parity bit ,Block (data storage) - Abstract
In this paper, we propose an innovative algorithm, namely block-overlapping parity check (BOPC), that can be applied to the existing halftone image data hiding algorithms data hiding smart pair toggling (DHSPT) to achieve improvement in visual quality. The proposed algorithm utilizes the properties of block-overlapping parity check to reduce the number of pair toggling required in DHSPT. Our experiments suggest that the proposed algorithm reduces the number of pixel pair toggling significantly and has a better performance in terms of modified peak-signal-to-noise ratio (MPSNR), especially when the watermark payload is high.
- Published
- 2007
26. A robust and fast block motion estimation algorithm
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Bing Zeng, M.L. Liou, and Renxiang Li
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Motion field ,business.industry ,Robustness (computer science) ,Adaptive system ,Motion estimation ,Computer vision ,Artificial intelligence ,business ,Motion vector ,Quarter-pixel motion ,Mathematics ,Block-matching algorithm ,Coding (social sciences) - Abstract
The authors present a new algorithm for fast block motion estimation in video coding applications. In this new algorithm, general characteristics of the block motion field are explored and related to the block motion vector statistics in the search window. As such, they present a way to design the optimal checking point pattern based on minimizing an objective function that is defined to be an average distance measure and such a pattern can be made adaptive to the motion statistics. Then, they suggest a regular checking point pattern which can be regarded as a sub-optimal solution. Simulation results show that motion estimation with the suggested pattern is both fast and robust. >
- Published
- 2002
27. An arbitrary ratio resizer for MPEG applications
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S. Levi and Renxiang Li
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business.industry ,Computer science ,Digital video ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Luma ,Sampling (statistics) ,Motion detection ,Deinterlacing ,Media Technology ,Electronic engineering ,Digital television ,Electrical and Electronic Engineering ,business ,Algorithm ,Digital filter - Abstract
We present a linear arbitrary ratio resizer for the interoperability of digital video in MPEG applications. The resizer supports conversions among interlaced/progressive 4:2:0, 4:2:2 and 4:4:4 formats with arbitrary resizing and fractional shift. Particularly, for interlaced to progressive conversion (deinterlacing), we propose a motion detection based deinterlacing algorithm, which combines resizing with deinterlacing, and thus is bandwidth efficient. A framework is established for sampling distance, which incorporates the fractional phase shift in the input/output luma/chroma samples. Phase factors and data loading signals are calculated with the sampling distance. With the proposed algorithm, a filter can be generated and implemented on the fly using software. Scheduling information for hardware implementation can also be obtained from the algorithm.
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- 2002
28. Overexpression of DBF-Interactor Protein 6 Containing an R3H Domain Enhances Drought Tolerance in Populus L. (Populus tomentosa)
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Yang Liu, Xinzhuan Yao, Lu Zhang, Litang Lu, and Renxiang Liu
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NtDIP6 ,POD ,CAT ,drought stress ,RT-qPCR analysis ,transgenic poplars ,Plant culture ,SB1-1110 - Abstract
Drought is the primary disaster that endangers agricultural production, including animal husbandry, and affects the distribution, growth, yield, and quality of crops. Previous study had revealed that DIP, as a potential regulator of DBF activity, played an important role in response to drought stress in maize. In this study, a total of 67 DIPs were identified from seventeen land plants, including six tobacco DIPs (NtDIPs). NtDIP6 gene was further selected as a candidate gene for subsequent experiments based on the phylogenetic analysis and structural analysis. The transgenic tobacco and poplar plants over-expressing NtDIP6 gene were generated using the Agrobacterium- mediated method. Although there was not phenotypic difference between transgenic plants and wild-type plants under normal conditions, overexpression of the NtDIP6 gene in transgenic tobacco and poplar plants enhanced the drought tolerance under drought treatments in comparison with the wild type. The content of antioxidant defense enzymes peroxidase (POD), catalase (CAT), and the photosynthetic rate increased in NtDIP6-Ox transgenic tobacco and poplar plants, while the content of malondialdehyde decreased, suggesting that the overexpression of NtDIP6 enhances the antioxidant capacity of transgenic poplar. Furthermore, the results of qRT-PCR showed that the level of expression of drought-related response genes significantly increased in the NtDIP6-Ox transgenic plants. These results indicated that NtDIP6, as a positive response regulator, improves drought stress tolerance by scavenging superoxide via the accumulation of antioxidant defense enzymes.
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- 2021
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29. Transcriptomic analysis reveals overdominance playing a critical role in nicotine heterosis in Nicotiana tabacum L.
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Maozhu Tian, Qiong Nie, Zhenhua Li, Jie Zhang, Yiling Liu, Yao Long, Zhiwei Wang, Guoqing Wang, and Renxiang Liu
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Nicotine ,Heterosis ,Nicotiana tabacum L. ,RNA-seq ,Botany ,QK1-989 - Abstract
Abstract Background As a unique biological phenomenon, heterosis has been concerned with the superior performance of the heterosis than either parents. Despite several F1 hybrids, containing supernal nicotine content, had been discovered and applied to heterosis utilization in Nicotiana tabacum L., nevertheless, the potential molecular mechanism revealing nicotine heterosis has not been illustrated clearly. Result Phenotypically, the F1 hybrids (Vall6 × Basma) show prominent heterosis in nicotine content by 3 years of field experiments. Transcriptome analysis revealed that genes participating in nicotine anabolism (ADC, PMT, MPO, QPT, AO, QS, QPT, A622, BBLs) and nicotine transport (JAT2, MATE1 and 2, NUP1 and 2) showed an upregulated expression in the hybrid, a majority of which demonstrated an overdominant performance. RT-PCR confirmed that nicotine anabolism was induced in the hybrid. Conclusions These findings strongly suggest that nicotine synthesis and transport efficiency improved in hybrid and overdominance at gene-expression level played a critical role in heterosis of nicotine metabolism.
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- 2018
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30. Real-Time Multimodal Human--Avatar Interaction.
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Yun Fu, Renxiang Li, Huang, Thomas S., and Danielsen, Mike
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THREE-dimensional imaging ,AVATARS (Virtual reality) ,JAVA programming language ,VISUAL communication ,HUMAN-machine systems ,AUDIOVISUAL materials ,MOBILE communication systems - Abstract
This paper presents a novel real-time multimodal human-avatar interaction (RTM-HAI) framework with vision-based remote animation control (RAC). The framework is designed for both mobile and desktop avatar-based human-machine or human-human visual communications in real-world scenarios. Using 3-D components stored in the Java mobile 3-D (M3G) file format, the avatar models can be flexibly constructed and customized on the fly on any mobile devices or systems that support the M3G standard. For the RAC head tracker, we propose a 2-D real-time face detection/tracking strategy through an interactive loop, in which the detection and tracking complement each other for efficient and reliable face localization, tolerating extreme user movement. With the face location robustly tracked, the RAC head tracker selects a main user and estimates the user's head rolling, tilting, yawing, scaling, horizontal, and vertical motion in order to generate avatar animation parameters. The animation parameters can be used either locally or remotely and can be transmitted through socket over the network. In addition, it integrates audio-visual analysis and synthesis modules to realize multichannel and runtime animations, visual TTS and real-time viseme detection and rendering. The framework is recognized as an effective design for future realistic industrial products of humanoid kiosk and human-to-human mobile communication. [ABSTRACT FROM AUTHOR]
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- 2008
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31. Reliable motion detection/compensation for interlaced sequences and its applications to...
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Renxiang Li and Bing Zeng
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VIDEO recording ,ALGORITHMS - Abstract
Presents a method for the motion detection/compensation between opposite parity fields in interlaced video sequences. Interlaced-to-progressive scan conversion; Phase-correction filter implementation; Aliasing term suppression for real-world interlaced signals; Experiment results for motion compensation; Proposed deinterlacing algorithms.
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- 2000
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32. A Non-Synonymous Single Nucleotide Polymorphism in the HJURP Gene Associated with Susceptibility to Hepatocellular Carcinoma among Chinese.
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Wenfeng Huang, Hongxing Zhang, Yumin Hao, Xiaobing Xu, Yun Zhai, Shaoxia Wang, Yang Li, Fuchao Ma, Yuanfeng Li, Zhifu Wang, Yang Zhang, Xiumei Zhang, Renxiang Liang, Zhongliang Wei, Ying Cui, Yongqiang Li, Xinsen Yu, Hongzan Ji, Fuchu He, Weimin Xie, and Gangqiao Zhou
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Medicine ,Science - Abstract
HJURP (Holliday Junction-Recognizing Protein) plays dual roles in DNA repair and in accurate chromosome segregation during mitosis. We examined whether the single nucleotide polymorphisms (SNPs) of HJURP were associated with the risk of occurrence of hepatocellular carcinoma (HCC) among chronic hepatitis B virus (HBV) carriers from well-known high-risk regions for HCC in China.Twenty-four haplotype-tagging SNPs across HJURP were selected from HapMap data using the Haploview software. We genotyped these 24 SNPs using the using Sequenom's iPLEX assay in the Fusui population, consisting of 348 patients with HCC and 359 cancer-free controls, and further investigated the significantly associated SNP using the TaqMan assay in the Haimen population, consisting of 100 cases and 103 controls. The genetic associations with the risk of HCC were analyzed by logistic regression.We observed an increased occurrence of HCC consistently associated with A/C or C/C genotypes of the non-synonymous SNP rs3771333 compared with the A/A genotype in both the Fusui and Haimen populations, with a pooled odds ratio 1.82 (95% confidence interval, 1.33-2.49; P = 1.9 × 10-4). Case-only analysis further indicated that carriers of the at-risk C allele were younger than those carrying the A/A genotype (P = 0.0016). In addition, the expression levels of HJURP in C allele carriers were lower than that in A/A genotype carriers (P = 0.0078 and 0.0010, for mRNA and protein levels, respectively).Our findings suggest that rs3771333 in HJURP may play a role in mediating the susceptibility to HCC among Chinese.
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- 2016
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33. A robust and fast block motion estimation algorithm.
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Renxiang Li, Bing Zeng, and Liou, M.L.
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- 1994
- Full Text
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