发明名称 |
Threshold matrix generation method, halftone image generation method, and halftone image generating apparatus |
摘要 |
<p>Each of moire elements which are repeat elements of first-order moire appearing by overlaying halftone images of first and second color components is positioned at one of candidate positions arranged at a moire pitch Pm in first and second moire directions orthogonal to each other. In a matrix area of a third color component, dot centers are arranged in a first tilt direction tilted relatively to the first moire direction by an angle of arctan((Pm)/(Pm)) and a second tilt direction orthogonal to the first tilt direction at a pitch of the square root of ((Pm 2 )+(Pm 2 )), and a threshold matrix of the color component is generated so that a halftone dot grows from each dot center in accordance with increase of gray level of the color component of the original image. Thus, it is possible to suppress second-order moire appearing in overlaying halftone images of the first to third color components.</p> |
申请公布号 |
EP2101482(B1) |
申请公布日期 |
2015.01.28 |
申请号 |
EP20090002044 |
申请日期 |
2009.02.13 |
申请人 |
DAINIPPON SCREEN MFG. CO., LTD. |
发明人 |
ASAI, HIROSHI |
分类号 |
H04N1/52 |
主分类号 |
H04N1/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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