IEEE Trans Image Process - Hierarchical colorant-based direct binary search halftoning.

Tópicos

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Resumo

Colorant-based direct binary search (CB-DBS) halftoning proposed in provides an image quality benchmark for dispersed-dot halftoning algorithms. The objective of this paper is to further push the image quality limit. An algorithm called hierarchical colorant-based direct binary search (HCB-DBS) is developed in this paper. By appropriately integrating yellow colorant into dot-overlapping and dot-positioning controls, it is demonstrated that HCB-DBS can achieve better halftone texture of both individual and joint dot-color planes, without compromising the dot distribution of more visible halftone of cyan and magenta colorants. The input color specification is first converted from colorant space to dot-color space with minimum brightness variation principle for full dot-overlapping control. The dot-colors are then split into groups based upon dot visibility. Hierarchical monochrome DBS halftoning is applied to make dot-positioning decision for each group, constrained on the already generated halftone of the groups with higher priority. And dot-coloring is decided recursively with joint monochrome DBS halftoning constrained on the related total dot distribution. Experiments show HCB-DBS improves halftone texture for both individual and joint dot-color planes. And it reduces the halftone graininess and free of color mottle artifacts, comparing to CB-DBS.

Resumo Limpo

colorantbas direct binari search cbdbs halfton propos provid imag qualiti benchmark disperseddot halfton algorithm object paper push imag qualiti limit algorithm call hierarch colorantbas direct binari search hcbdbs develop paper appropri integr yellow color dotoverlap dotposit control demonstr hcbdbs can achiev better halfton textur individu joint dotcolor plane without compromis dot distribut visibl halfton cyan magenta color input color specif first convert color space dotcolor space minimum bright variat principl full dotoverlap control dotcolor split group base upon dot visibl hierarch monochrom dbs halfton appli make dotposit decis group constrain alreadi generat halfton group higher prioriti dotcolor decid recurs joint monochrom dbs halfton constrain relat total dot distribut experi show hcbdbs improv halfton textur individu joint dotcolor plane reduc halfton graini free color mottl artifact compar cbdbs

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