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公开(公告)号：EP0559982B1
公开(公告)日：1999-05-26
申请号：EP92308888.4
申请日：1992-09-30
CPC分类号： H04N5/9264 , H04N5/783 , H04N19/124 , H04N19/14 , H04N19/146 , H04N19/147 , H04N19/15 , H04N19/154 , H04N19/172 , H04N19/176 , H04N19/18 , H04N19/196 , H04N19/60 , H04N19/94
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公开(公告)号：EP0559982A3
公开(公告)日：1994-09-14
申请号：EP92308888.4
申请日：1992-09-30
CPC分类号： H04N5/9264 , H04N5/783 , H04N19/124 , H04N19/14 , H04N19/146 , H04N19/147 , H04N19/15 , H04N19/154 , H04N19/172 , H04N19/176 , H04N19/18 , H04N19/196 , H04N19/60 , H04N19/94
摘要： An image compression encoding and decoding method and apparatus therefor is disclosed in which DC coefficients of a DCT block are scalar-quantized and AC coefficients are classified-vector-quantized (CVQ), and respective DCT blocks are classified by the least value of the square of the result that horizontal AC coefficients and vertical AC coefficients are subtracted from a representative value of a preset reference class. Using a multilevel compression method, lowest level codes are vector-partitioned by P-units with respect to each classified DCT block, and code books of representative vectors corresponding to the partitioned vectors are provided. Indices of corresponding representative vectors in respective code books and the classified codes are taken as encoding data corresponding to AC coefficients to keep a constant number of bits. Code books of S-units of representative vectors corresponding to errors are provided again, and corresponding indices and parity data in the respective code books are provided thereby performing a multi-level-classification-vector-quantization to be encoded. Decoding is performed in the reverse sequence of encoding. During a high speed search, only the lowest level codes having a constant number of bits are decoded regardless of the complexity of the picture.
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公开(公告)号：EP0559982A2
公开(公告)日：1993-09-15
申请号：EP92308888.4
申请日：1992-09-30
CPC分类号： H04N5/9264 , H04N5/783 , H04N19/124 , H04N19/14 , H04N19/146 , H04N19/147 , H04N19/15 , H04N19/154 , H04N19/172 , H04N19/176 , H04N19/18 , H04N19/196 , H04N19/60 , H04N19/94
摘要： An image compression encoding and decoding method and apparatus therefor is disclosed in which DC coefficients of a DCT block are scalar-quantized and AC coefficients are classified-vector-quantized (CVQ), and respective DCT blocks are classified by the least value of the square of the result that horizontal AC coefficients and vertical AC coefficients are subtracted from a representative value of a preset reference class. Using a multilevel compression method, lowest level codes are vector-partitioned by P-units with respect to each classified DCT block, and code books of representative vectors corresponding to the partitioned vectors are provided. Indices of corresponding representative vectors in respective code books and the classified codes are taken as encoding data corresponding to AC coefficients to keep a constant number of bits. Code books of S-units of representative vectors corresponding to errors are provided again, and corresponding indices and parity data in the respective code books are provided thereby performing a multi-level-classification-vector-quantization to be encoded. Decoding is performed in the reverse sequence of encoding. During a high speed search, only the lowest level codes having a constant number of bits are decoded regardless of the complexity of the picture.
摘要翻译： 公开了一种图像压缩编码和解码方法及其装置，其中对DCT块的DC系数进行标量量化并对AC系数进行分类矢量量化（CVQ），并且通过平方的最小值对各个DCT块进行分类 从预设参考类别的代表值中减去水平AC系数和垂直AC系数的结果。 使用多级压缩方法，针对每个分类的DCT块，由P个单位矢量划分最低级代码，并且提供与分割的矢量对应的代表矢量的代码簿。 将相应代码簿中的相应代表矢量的索引和分类代码作为对应于AC系数的编码数据以保持恒定的比特数。 再次提供与错误相对应的代表矢量的S单元的码本，并且提供各个码本中的对应索引和奇偶校验数据，从而执行要被编码的多级分类矢量量化。 解码以相反的编码顺序执行。 在高速搜索期间，无论图像的复杂程度如何，只有具有恒定位数的最低级代码才被解码。
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