发明名称 |
ADAPTIVE QUANTIZATION WITH BALANCED PIXEL-DOMAIN DISTORTION DISTRIBUTION IN IMAGE PROCESSING |
摘要 |
<p>Methods and encoders and decoders for adaptively quantizing transform domain coefficients in image and/or video encoding/decoding. For an image having a number of blocks, each block having N coefficients, the quantization step size for each coefficient is selected dynamically, thus resulting in a quantizer that may apply different step sizes to different coefficients. The selected step sizes for each coefficient are used for those coefficients within all blocks in the image/frame. In one aspect, the step sizes are selected on the basis of balancing pixel domain distortion when the image/frame is decoded.</p> |
申请公布号 |
EP2396770(A4) |
申请公布日期 |
2012.12.12 |
申请号 |
EP20100740868 |
申请日期 |
2010.02.12 |
申请人 |
RESEARCH IN MOTION LIMITED |
发明人 |
YU, XIANG;HE, DAKE;YANG, EN-HUI |
分类号 |
G06T9/00;H04N7/26;H04N7/50;H04N19/89 |
主分类号 |
G06T9/00 |
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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