发明名称 |
Method, apparatus and computer program for halftoning digital images |
摘要 |
<p>The invention relates to a method for generating a halftone image comprising, for each input pixel, adding a previously determined error term to the input pixel value to obtain a modified input pixel value; determining an error diffusion threshold level based on the input pixel value; applying a quantization operation to the modified input pixel value using the determined error diffusion threshold level for obtaining an output pixel value; determining an error contribution. The error diffusion threshold level depends on a result of a comparison operation performed between the input pixel value and a threshold value selected from a set of threshold values, the selection of the threshold value being based on the position of the input pixel in the input image.</p> |
申请公布号 |
EP1798951(B1) |
申请公布日期 |
2015.04.08 |
申请号 |
EP20060125776 |
申请日期 |
2006.12.11 |
申请人 |
OCÉ-TECHNOLOGIES B.V. |
发明人 |
CITTADINI, FERUCCIO;PERVILLÉ, JACQUES C.E. |
分类号 |
H04N1/405 |
主分类号 |
H04N1/405 |
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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