发明名称 |
QUANTIZATION ADJUSTMENTS FOR DC SHIFT ARTIFACTS |
摘要 |
A video encoder identifies one or more portions of a video picture that contain DC shift blocks and adjusts quantization (e.g., by selecting a smaller quantization step size) to reduce contouring artifacts when the picture is reconstructed. The encoder can identify the portion(s) of the picture that contain DC shift blocks by identifying one or more gradient slope regions in the picture and analyzing quantization effects on DC coefficients in the gradient slope region(s). The encoder can select a coarser quantization step size for a high-texture picture portion. |
申请公布号 |
EP2005755(A4) |
申请公布日期 |
2015.09.23 |
申请号 |
EP20070755274 |
申请日期 |
2007.04.09 |
申请人 |
MICROSOFT TECHNOLOGY LICENSING, LLC |
发明人 |
ZUO, XIPING;LIN, CHIH-LUNG;HSU, POHSIANG |
分类号 |
H04N19/192;H04N19/117;H04N19/124;H04N19/14;H04N19/154;H04N19/176;H04N19/18;H04N19/59;H04N19/61;H04N19/86 |
主分类号 |
H04N19/192 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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