发明名称 |
Apparatus outputting quantized image data, selecting from filters with different error spreading effects |
摘要 |
An image processing apparatus includes an edge detector for detecting whether or not a target pixel of an input image signal is at an edge portion of a discontinuous density image; a first quantizer for generating quantized image data with respect to the target pixel by using a first error spreading filter having a relatively high error spreading effect, such that a density error between the input image signal and an output multilevel image signal is incorporated in "m" neighboring pixels surrounding the target pixel; a second quantizer for generating quantized image data with respect to the target pixel by using a second error spreading filter having a relatively low error spreading effect, such that a density error between the input image signal and the output multilevel image signal is incorporated in "m" neighboring pixels surrounding the target pixel; and a selector for selecting either the quantized image data generated by the first quantizer or the quantized image data generated by the second quantizer in accordance with the result of a detection made by the edge detector.
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申请公布号 |
US5363210(A) |
申请公布日期 |
1994.11.08 |
申请号 |
US19920950173 |
申请日期 |
1992.09.24 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
SASAKI, TOMIO;OBATA, MASAHITO |
分类号 |
H04N1/40;H04N1/405;(IPC1-7):G06F15/70 |
主分类号 |
H04N1/40 |
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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