Coding distortion removal method, moving picture coding method, moving picture decoding method, and apparatus for realizing the same, program
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShinya Kadono, Sheng Mei Shen, Teck Wee Foo, Chak Joo Lee, Zhong Xue
Life of this patent
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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.
Claims5
A coding distortion removal method for removing coding distortion in an area disposed on both sides of a boundary line between a first block and an adjacent second block in an interlaced picture composed of odd-line pixels and even-line pixels and having a plurality of blocks forming a moving picture image,
- the first block being a frame structure block having a specific number of odd-line pixels and a specific number of even-line pixels of the interlaced picture, and
- the second block being a field structure block having one field composed of a specific number of odd-line pixels of the interlaced picture, and another field composed of a specific number of even-line pixels of the interlaced picture, the coding distortion removal method comprising:
- converting the first block from a frame structure block to a field structure block;
- comparing a difference of pixel values in pixels of the second block and pixel values in pixels of the converted first block with a specific threshold value;
- and
- removing coding distortion based on the result of the comparison.
Dependencies are inferred from the claim text.