发明名称
摘要 Image data is encoded into sync blocks of fixed length and maximum data volume by dividing a vertical interval of image data samples, such as a field or frame of samples, into a plurality of blocks (G1, G2,...) and deriving the orthogonal transform of the image data samples in each block (G1, G2,...). A block of conversion coefficients that are produced by the orthogonal transform are quantized with the same quantizing step to produce weighted, quantized conversion coefficients having a weighting factor that is a function of the visual activity of that block. Then, the weighted, quantized conversion coefficients of a block are variable length coded and the variable length codes of a predetermined number of blocks are combined into a sync block of fixed length. <IMAGE>
申请公布号 EP0517256(A3) 申请公布日期 1994.01.05
申请号 EP19920109562 申请日期 1992.06.05
申请人 SONY CORPORATION 发明人 YANAGIHARA, NAOFUMI;NAGAI, MICHIO
分类号 G06T9/00;H04N5/926;H04N7/52;H04N7/54;H04N19/60 主分类号 G06T9/00
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