tailieunhanh - Báo cáo hóa học: " Similarity criterion for image resizing"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Similarity criterion for image resizing | Hua et al. EURASIP Journal on Advances in Signal Processing 2011 2011 27 http content 2011 1 27 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Similarity criterion for image resizing Shungang Hua Xiaoxiao Li and Qing Zhong Abstract Based on bidirectional similarity measure between patches of image in this study we investigate the similarity criterion of image for resizing image. First our scheme implements image resizing by Seam Carving step by step. For each step we remove five seams and then calculate the dissimilarity between the original image and its resized one as well as the relative difference of dissimilarity between neighboring steps. According to the relative differences of dissimilarity of all steps we can assess the degree of distortion of the resized image and conclude the similarity criterion. On the basis of the similarity criterion we present an effective image-resizing algorithm by combining Seam Carving Scaling and Bidirectional Similarity iteration. Before the salient feature gets damaged markedly we change the resizing method from Seam Carving to Scaling and resize the image up to the preferred size. Then we can update the resized image to eliminate artifacts by iterative computations of Bidirectional Similarity measure. Experiments show that even though the amount of adjustment is large our algorithm can preserve the important information local structures and global visual effect adequately. Keywords image resizing similarity criterion dissimilarity relative difference of dissimilarity 1. Introduction With the rapid development of the multimedia technology various display devices have been emerging endlessly such as computer screen digital TV mobile media MP4 digital camera and so on. In order that digital image and video should be transmitted and displayed in different display devices digital image and video need to be changed to different size or aspect ratio for .