发明名称 |
Noise reduction circuit and method |
摘要 |
A noise reduction circuit and method effectively reduce noise with a simple structure regardless of the partial content of an image while suppressing an increase in the capacity of the image memory used and process delays. The present invention forms noise-reduced data by utilizing a correlation between from the difference between a pixel subjected to noise reduction and data of a pixel that is shifted by a predetermined amount in a time direction and/or spatial direction, and forms a difference cause discriminating signal indicating whether the difference is due to a valid change of the image. The noise-reduced data and the difference cause discriminating signal are formed for a plurality of different correlations. Final noise-reduced video data are obtained by selecting a method for determining the final noise-reduced video data based on the difference cause discriminating signals, and accordingly selecting/combining the plurality of noise-reduced data.
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申请公布号 |
US2005122433(A1) |
申请公布日期 |
2005.06.09 |
申请号 |
US20040981776 |
申请日期 |
2004.11.05 |
申请人 |
OKI ELECTRIC CO., LTD. |
发明人 |
SATOU TAKAYUKI;TAKAHASHI HIDETSUGU |
分类号 |
H04N5/21;H04N9/64;(IPC1-7):H04N9/64 |
主分类号 |
H04N5/21 |
代理机构 |
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地址 |
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