发明名称 |
VARIABLE LOCALIZED BIT DEPTH INCREASE FOR FIXED-POINT TRANSFORMS IN VIDEO CODING |
摘要 |
This disclosure describes techniques for mitigating rounding errors in a fixed-point transform associated with video coding by applying a variable localized bit-depth increase at the transform. More specifically, the techniques include selecting a constant value based on a size of a fixed-point transform in a video coding device and applying a variable localized bit-depth increase at the transform with a value equal to the constant value. Applying the variable localized bit-depth increase includes left-shifting a transform input signal by a number of bits equal to the constant value before the fixed-point transform, and right-shifting a transform output signal by a number of bits equal to the constant value after the fixed-point transform. The constant value is selected from a plurality of constant values stored on the video coding device. Each of the constant values is pre-calculated for one of a plurality of different transform sizes supported by the video coding. |
申请公布号 |
EP2594072(B1) |
申请公布日期 |
2016.08.17 |
申请号 |
EP20110733767 |
申请日期 |
2011.07.08 |
申请人 |
QUALCOMM INCORPORATED |
发明人 |
JOSHI, RAJAN, L.;CHIEN, WEI-JUNG;KARCZEWICZ, MARTA;REZNIK, YURIY;CHEN, PEISONG;CHUANG, HSIAO-CHIANG |
分类号 |
H04N19/176;H04N19/122;H04N19/157;H04N19/184;H04N19/196;H04N19/42;H04N19/46;H04N19/60;H04N19/61 |
主分类号 |
H04N19/176 |
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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