发明名称 |
System and method for eliminating background pixels from a scanned image |
摘要 |
An image desired to be reproduced is scanned to determine its video pixel gray values. A histogram generator generates a histogram distribution representing a frequency of the gray values. The histogram distribution is analyzed to determine a background peak gray value of the image and a standard deviation of the histogram distribution based on a Gaussian approximation. A thresholding circuit dynamically adjusts the background peak value based on the standard deviation and a selected scaling factor to generate a background threshold value. The background threshold value expands a range of background gray values in the image which are eliminated during image reproduction. Eliminating substantially all background gray values improves the quality of the reproduced image.
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申请公布号 |
US6222642(B1) |
申请公布日期 |
2001.04.24 |
申请号 |
US19980131912 |
申请日期 |
1998.08.10 |
申请人 |
XEROX CORPORATION |
发明人 |
FARRELL BARBARA L.;SHIAU JENG-NAN |
分类号 |
G06K9/38;G06K9/40;G06T5/00;H04N1/40;H04N1/407;(IPC1-7):G06K15/02;G06K9/52;G06T5/40 |
主分类号 |
G06K9/38 |
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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