Apparatus and method for adaptive spatial segmentation-based noise reducing for encoded image signal
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United States of America Patent
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Jul 11, 2006
Grant Date -
Jun 24, 2004
app pub date -
Dec 10, 2003
filing date -
Jun 12, 2001
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Abstract
An efficient and non-iterative post processing method and system is proposed for mosquito noise reduction in DCT block-based decoded images. The post-processing is based on a simple classification that segments a picture in multiple regions such as Edge, Near Edge, Flat, Near Flat and Texture regions. The proposed technique comprises also an efficient and shape adaptive local power estimation for equivalent additive noise and provides simple noise power weighting for each above cited region. An MMSE or MMSE-like noise reduction with robust and effective shape adaptive windowing is utilized for smoothing mosquito and/or random noise for the whole image, particularly for Edge regions. Finally, the proposed technique comprises also, for chrominance components, efficient shape adaptive local noise power estimation and correction.
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