文章基本信息

标题：Shape-adaptive DCT and Its Application in Region-based Image Coding
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作者：Yamin Zheng ; Xiaoyan Wang ; Chengyou Wang 等
期刊名称：International Journal of Signal Processing, Image Processing and Pattern Recognition
印刷版ISSN：2005-4254
出版年度：2014
卷号：7
期号：1
页码：99-108
DOI：10.14257/ijsip.2014.7.1.10
出版社：SERSC
摘要：To get better and flexible performance, region-based image coding has been studiedwidely in the last few years. In region-based image coding, the whole image can be dividedinto two parts: region-of-interest (ROI) and background area. ROI is coded in lowcompression ratio, while background area is coded in high compression ratio. In this paper,shape-adaptive DCT (SA-DCT) for coding arbitrarily shaped image segments is introduced.And two region-based image coding methods using discrete cosine transform (DCT) and SADCTare presented. The algorithm based on SA-DCT is comparable with the one based onDCT in terms of reconstructed images’ effects. Experimental results show that the algorithmbased on SA-DCT performs better than the one based on DCT both in subjective effect andobjective effect. Therefore, SA-DCT is a more suitable transform for region-based imagecoding than DCT.
关键词：image coding; discrete cosine transform (DCT); shape-adaptive DCT (SADCT);region-of-interest (ROI); image segmentation