CODING DISTORTION REMOVAL METHOD, VIDEO ENCODING METHOD, AND APPARATUS AND PROGRAM FOR THE SAME
First Claim
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1. A method for coding, on a block basis, an image segmented into a plurality of blocks, comprising:
- decoding a coded block to obtain a decoded block, determining a filter selection parameter that determines, using a quantization parameter, a threshold value to change a coding distortion removal method;
removing coding distortion in pixels on both sides of a block boundary between adjacent decoded blocks by applying a coding distortion removal method selected based on comparison of a difference value of pixels in adjacent decoded blocks with the threshold value determined based on the filter selection parameter; and
encoding the filter selection parameter to obtain a coded filter selection parameter.
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Abstract
Mosaic-shaped block noise occurs when a compressed video signal is reproduced. This block noise is removed but removing block noise from every block using a deblocking filter imposes a significant load on the deblocking filter. This load is therefore reduced by determining whether coding distortion removal (deblocking) is necessary, and applying a deblocking filter only when needed.
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Citations
6 Claims
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1. A method for coding, on a block basis, an image segmented into a plurality of blocks, comprising:
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decoding a coded block to obtain a decoded block, determining a filter selection parameter that determines, using a quantization parameter, a threshold value to change a coding distortion removal method;
removing coding distortion in pixels on both sides of a block boundary between adjacent decoded blocks by applying a coding distortion removal method selected based on comparison of a difference value of pixels in adjacent decoded blocks with the threshold value determined based on the filter selection parameter; and
encoding the filter selection parameter to obtain a coded filter selection parameter. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification