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公开(公告)号:US06501397B1
公开(公告)日:2002-12-31
申请号:US09578286
申请日:2000-05-25
IPC分类号: H03M700
CPC分类号: H04N19/34 , H04N19/12 , H04N19/147 , H04N19/184 , H04N19/436 , H04N19/46
摘要: The present invention is directed to a variable coding of the bit-planes for a particular source signal. This includes first partitioning or grouping the different bit-planes into embedded sub-signals and then coding each sub-signal. This technique enables an encoder according to the present invention to control and achieve a desired trade-off point between scalability and coding-efficiency. Therefore, in cases where bit or bit-plane level granularity is not required, coding efficiency can be improved by combining two or more bit-planes prior to coding. In addition, since the statistical nature of each bit-plane is different, the level of grouping used across the bit-planes can vary.
摘要翻译: 本发明涉及用于特定源信号的位平面的可变编码。 这包括首先将不同的位平面划分或分组成嵌入的子信号,然后对每个子信号进行编码。 这种技术使得根据本发明的编码器能够在可扩展性和编码效率之间控制和实现期望的权衡点。 因此,在不需要位或位平面级粒度的情况下,可以通过在编码之前组合两个或多个位平面来提高编码效率。 另外,由于每个位平面的统计特性不同,所以在平面上使用的分组水平可以变化。
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公开(公告)号:US06577773B1
公开(公告)日:2003-06-10
申请号:US09488030
申请日:2000-01-20
IPC分类号: G06K936
CPC分类号: H04N19/126 , H04N19/60 , H04N19/61
摘要: A quantizer is disclosed in which the quantization errors are symmetrically divided around the respective reconstruction levels. The quantizer prevents quantization errors from accumulating when the quantizer operates in a recursive loop. This is important if such a quantizer is used, inter alia, for compressing image data in the prediction loop of an MPEG decoder. The quantizer prevents such a decoder from drifting away from the encoder's local prediction loop.
摘要翻译: 公开了量化器,其中量化误差围绕相应的重建级别对称地分割。 当量化器在递归循环中操作时,量化器防止量化误差累积。 如果使用这样的量化器特别是用于压缩MPEG解码器的预测循环中的图像数据,这是重要的。 量化器防止这种解码器远离编码器的局部预测环路漂移。
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公开(公告)号:US06553146B1
公开(公告)日:2003-04-22
申请号:US09488029
申请日:2000-01-20
IPC分类号: G06K936
CPC分类号: H04N19/14 , H04N19/126 , H04N19/149 , H04N19/176 , H04N19/61
摘要: When embedded memory compression is used in the recursive loop of a predictive (MPEG) encoder/decoder, a given compression factor must be achieved. To this end, the image is divided in segments, i.e. groups of (macro)blocks. Each segment is feedforward coded using a quantization strategy such that the compression factor is achieved. This leaves spare bits in the (fixed) segment size. In accordance with the invention, the space left unused by segments is used for refining the quantization of segments having a higher than average activity.
摘要翻译: 当在预测(MPEG)编码器/解码器的递归循环中使用嵌入式存储器压缩时,必须实现给定的压缩因子。 为此,图像被划分成片段,即(宏)块组。 每个段使用量化策略进行前馈编码,使得实现压缩因子。 这将留下(固定)段大小的备用位。 根据本发明,由片段未使用的空间用于精细化具有高于平均活性的片段的量化。
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