发明名称 |
METHOD FOR ENCODING AND DECODING IMAGE BLOCK, ENCODER AND DECODER |
摘要 |
A method for encoding and decoding an image block, an encoder, and a decoder are provided. The method for encoding an image block comprises: determining a local dynamic range of the block; adaptively precision-extending pixel values of the block based on the local dynamic range of the block; and encoding the block with an adaptively extended precision. The method for decoding an image block comprises: determining a minimum pixel value of the block and an indicating value for indicating a precision extension factor according to precision extension information; decoding the block according to the indicating value; and de-extending precision of the decoded block based on the minimum pixel value of the block and the precision extension factor. The precision of the intermediate calculations may be improved without increasing an original intermediate bit depth used in intermediate calculations. |
申请公布号 |
US2015365701(A1) |
申请公布日期 |
2015.12.17 |
申请号 |
US201514739081 |
申请日期 |
2015.06.15 |
申请人 |
THOMSON LICENSING |
发明人 |
LE PENDU Mikael;THOREAU Dominique;GUILLEMOT Christine;ALAIN Martin |
分类号 |
H04N19/625;H04N19/42;H04N19/44 |
主分类号 |
H04N19/625 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
Issy de Moulineaux FR |