文献类型：期刊文献

英文题名：Dynamic RGB-to-CMYK conversion using visual contrast optimisation

作者：Chen, Zhihua[1];Wang, Zhenzhu[1];Sheng, Bin[2,3];Li, Chao[1];Shen, Ruimin[2];Li, Ping[4]

机构：[1]East China Univ Sci & Technol, Dept Comp Sci & Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Dept Comp Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;[3]Chinese Acad Sci, Inst Software, State Key Lab Comp Sci, Beijing, Peoples R China;[4]Educ Univ Hong Kong, Dept Math & Informat Technol, Hong Kong, Hong Kong, Peoples R China

年份：2017

卷号：11

期号：7

起止页码：539

外文期刊名：IET IMAGE PROCESSING

收录：;EI(收录号：20172803934628);WOS:【SCI-EXPANDED(收录号:WOS:000404997300010)】；

基金：The work was supported by the National Natural Science Foundation of China (nos. 61572316, 61671290), the National High-tech R&D Program of China (863 Program) (no. 2015AA015904), the Key Program for International S&T Cooperation Project (no. 2016YFE0129500) of China, the Science and Technology Commission of Shanghai Municipality Program (no. 13511505000), the Science and Technology Commission of Shanghai Municipality (no. 16DZ0501100), the interdisciplinary Program of Shanghai Jiao Tong University (no. 14JCY10), and a grant from The Education University of Hong Kong (no. FLASS/DRF/ECR-7).

语种：英文

外文关键词：image colour analysis; optimisation; entropy; filtering theory; dynamic RGB-to-CMYK conversion; visual contrast optimisation; standard colour space; CMYK colour model; subtractive colour space; CMYK conversion methods; dynamic CMYK colour conversion; ink consumption; static conversion method

摘要：As the standard colour space used by printers, Cyan, Magenta, Yellow, Black (CMYK) colour model is a subtractive colour space used to describe the printing process. Existing CMYK conversion methods rely on static conversion table, which may not preserve the subtle visual structures of images, due to the local visual contrast loss caused by the static colour mapping. Therefore, the authors propose a novel dynamic Red, Green, Blue (RGB)-to-CMYK colour conversion, which utilises the weighted entropy to extract the pixels with filter response change dramatically. They obtain the image activity map by combining these pixels with high skin probability regions, and optimise the colour conversion of each pixel to ensure that the ink used for each pixel can be saved, while the visual contrast can be preserved with ink-saving. In this way, their proposed technique can achieve dynamic CMYK colour conversion, in which the consumption of ink can be reduced without the loss of visual contrast. The experimental results have shown that their dynamic CMYK colour conversion saved 10-25% ink consumption compared with the static conversion method, while with high visual quality for the converted images.