发明名称 Multi-mode alpha image processing
摘要 An alpha image encoding and decoding scheme operable according two different modes is disclosed. In the encoding, an alpha image is decomposed into alpha image blocks (600) comprising image elements (610). The blocks (600) are compressed into block representations (700) according to one of the two compression modes. A block representation (700) comprises a color codeword (720), an intensity codeword (730), an alpha codeword (740) and a sequence (750) of image element associated indices indicative of one of the codewords (730, 740). The compression and decompression mode to use for a block (600) is determined based on the alpha codeword (740). In a high alpha-resolution mode, the index sequence (750) comprises alpha indices selecting one of the quantized alpha values (740A, 740B) of the alpha codeword (740) and intensity indices selecting an intensity modifier from a modifier set represented by the intensity codeword (730). In a high luminance-resolution mode, the index sequence (750) only comprises intensity indices.
申请公布号 US7693337(B2) 申请公布日期 2010.04.06
申请号 US20040583454 申请日期 2004.12.17
申请人 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) 发明人 STROEM JACOB;AKENINE-MOELLER TOMAS
分类号 G06K9/36;G06T;G06T9/00;G09G5/00;G09G5/02;H03M7/00;H04N7/26;H04N7/30 主分类号 G06K9/36
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