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Aiming at the different texture characteristics of the forest and the smoke image,a smoke segmentation method about the improvement of differential box-counting(DBC)fractal dimension algorithm is proposed.Firstly,the improved algorithm expands the scope of child window based on the existing algorithm,calculates every pixel fractal dimension and analyses them.Then,it filters the pixels marked the smoke feature by choosing the fit threshold,it can realize smoke image segmentation.Finally,the expansive algorithm in the morphology is used to the connected processing.The experimental results demonstrate that the improved differential box-counting fractal dimension algorithm has a satisfying segmentation result.

Objectives Essential hypertension is considered to be a multifactorial trait resulting from the combined influence of environmental and genetic determinants. The aim of the study is to assess the association between the human AGTR1 gene and essential hypertension (EH) using a haplotype-based case-control study in Han Chinese subjects. Design and methods Seven tag SNPs and the A1166C polymorphism of the AGTR1 gene were genotyped in 510 hypertension subjects and 510 normotensive subjects using PCR-RFLP method. Results Single SNP analyses indicated that the rs12695895 was significantly associated with hypertension, adjusted for covariates. Compared with the other haplotypes, Hap4 (AGGACTT) which carry the susceptible rs12695895 A allele was found to significantly increase the risk of EH with odds ratios equal to 1.84 ( p = 0.0002). Conclusions The present results indicate that rs12695895 might be a genetic marker for EH and Hap4 (AGGACTT) was associated with hypertension in Han Chinese population.