Reducing undesirable block based image processing artifacts by DC image filtering
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United States of America Patent
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Nov 10, 2009
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app pub date -
Oct 29, 2003
filing date -
Oct 29, 2003
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Abstract
A post-processing manager provides reconstructed block based picture post-processing that is uncoupled from picture decoding by dividing a reconstructed image that was encoded using block based processing into non-overlapping blocks, creating a DC image by computing the DC value of each block, creating a zero mean image by subtracting the DC value of each block from the corresponding pixels of that block, filtering the DC image and adding the filtered DC image to the zero mean image. A weak filtering operation can be applied to reduce blocking artifacts, and a strong filtering operation can be applied to smooth luminance transitions.
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