发明名称 |
Reduction of noise visibility in a digital video system |
摘要 |
The effects of noise in a video processing system are reduced, resulting in improved image quality. A digital video signal containing a luminance component in Y color space is processed by increasing the amplitude of the luminance data in accordance with a nonlinear transfer function. As a result, low-amplitude components of the luminance signal are reduced. Subsequent quantization errors in transform coefficients produced by a spatial compression routine in a video encoder are consequently reduced. Inverse operations are performed at a video decoder to recover the original luminance data. The invention reduces quantization noise which is manifested particularly as dust-like variations in luminance intensity in an otherwise darkened region of a video image. A decoder apparatus is also presented.
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申请公布号 |
US6021216(A) |
申请公布日期 |
2000.02.01 |
申请号 |
US19990226770 |
申请日期 |
1999.01.06 |
申请人 |
GENERAL INSTRUMENT CORPORATION |
发明人 |
SATHE, VINAY;PAIK, WOO H. |
分类号 |
H04N7/26;H04N7/30;H04N7/50;(IPC1-7):G06K9/00;G06K9/36 |
主分类号 |
H04N7/26 |
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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