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• Gamut mapping distortions cannot be evaluated effectively by grayscale metrics. • Unlike conventional distortions, gamut mapping also incorporate global distortions. • Quality assessment metrics can be used for benchmarking gamut mapping algorithms. Gamut mapping is a key technology to achieve high-quality cross-media color reproduction. To optimize a gamut mapping algorithm, an important step is to conduct an accurate evaluation of its psycho-visual performance. This paper presents an objective blind image quality assessment (BIQA) metric for gamut-mapped images based on natural scene statistics. Considering both the local and global aspects of distortions in gamut-mapped images, two categories of statistics are analyzed. Specifically, the local statistical features are used to portray structural and color distortions and features extracted from global statistics are utilized to characterize the naturalness of image. The proposed metric does not need ground truth quality scores for training, thus it is "completely" blind. Experimental results on three gamut mapping databases demonstrate that our method outperforms the state-of-the-art general-purpose BIQA models. To further validate its effectiveness, the proposed metric is applied for benchmarking GMAs as an application and achieves encouraging performance. [ABSTRACT FROM AUTHOR]

Trypsin-like serine protease (TLS) is ubiquitous in animals and plays a number of diverse roles, including dietary protein digestion, hemolymph coagulation, antimicrobial activity and immune responses, among others. This study reports the isolation of a 1048 bp full-length cDNA sequence of TLS from triangle-shell pearl mussel ( Hyriopsis cumingii ), including a 12 bp 5' UTR (untranslated region), a 172 bp 3' UTR, and an open reading frame (ORF) of 864 bp by rapid amplification of cDNA ends (RACE). Bioinformatic analysis shows that the gene belongs to the trypsin-like serine protease superfamily, and contains a 15 residues N-terminal signal peptide and a conserved C-terminal domain. In comparison to other serine proteases, the catalytic triad were identified as His-98, Asp-149, and Ser-240. Quantitative real-time PCR (qPCR) showed a broad expression of the TLS gene in ten tested tissues. Time-course expression analysis demonstrated that the expression level of the TLS mRNA was significantly up-regulated in eight tested tissues (liver, intestine, gill, heart, axe foot, adductor muscle, kidney and gonad), but down-regulated in mantle and stomach after Aeromonas hydrophila injection. This is one of the results indicate that TLS may be involved in innate defense reactions against A. hydrophila in triangle-shell pearl mussel. [ABSTRACT FROM AUTHOR]