发明名称 |
Image processing apparatus including low-linear-density dot region detection unit, and image forming apparatus including the same |
摘要 |
An image processing apparatus includes a maximum/minimum density detecting unit which detects a center pixel of a matrix of NxN pixels in image data that has a maximum or minimum density. A determination unit determines whether the absolute value of a difference between an average of densities of diagonal pixels of the matrix and a density of the center pixel is larger than a threshold value. A peak pixel detecting unit detects peak pixels of the matrix, each peak pixel being the center pixel having a maximum or minimum density, and the absolute value of the difference with respect to the center pixel being larger than the threshold value. A dot region detecting unit detects one of neighboring pixels of the matrix as being a dot region based on the number of the peak pixels in a target region and the number of the peak pixels in each of neighboring regions.
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申请公布号 |
US7085013(B2) |
申请公布日期 |
2006.08.01 |
申请号 |
US20030662415 |
申请日期 |
2003.09.16 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
YAMAKAWA SHINJI |
分类号 |
H04N1/40;G06T5/00;G06T5/20;G06T5/30;G06T7/40;H04N1/409;H04N1/46;H04N1/60 |
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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