发明名称 |
Method for enhancing compressibility and visual quality of scanned document images |
摘要 |
A system and method of image processing for smoothing, denoising, despeckling and sharpening scanned document images which is performed prior to a compression. The scanned image is selectively smoothed by anisotropic diffusion filtering in a single iteration with a 3x3 kernel, which provides denoising, edge-preserving smoothing. The smoothed image data is then selectively sharpened using variable contrast mapping that provides overshoot-free variable-sharpening and despeckling. Image quality is improvides while increasing compressibility of the image.
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申请公布号 |
US6731821(B1) |
申请公布日期 |
2004.05.04 |
申请号 |
US20000675270 |
申请日期 |
2000.09.29 |
申请人 |
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. |
发明人 |
MAURER RON P.;BARASH DANNY |
分类号 |
G06K9/40;H04N1/409;(IPC1-7):G06K9/36 |
主分类号 |
G06K9/40 |
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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