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公开(公告)号：US5214502A
公开(公告)日：1993-05-25
申请号：US810337
申请日：1991-12-19
CPC分类号： H04N11/042 , H04N19/126 , H04N19/186 , H04N19/63 , H04N19/10 , H04N19/102
摘要： To enable a digital composite color video signal (NTSC or PAL) to be compressed directly, that is without dividing it into its components and compressing the components separately, the digital composite color video signal is decorrelated, for example by spatial sub-band filtering, to form data sets, for example sub-bands, representing dc luminance information, ac luminance information and dc chrominance information. The data sets are then quantized in accordance with respective quantization values from a quantization matrix, those quantization values being such that the amount of quantization of each of some of the data sets to which the dc luminance information and the dc chrominance information is at least predominantly confined is less than the average of the amounts of quantization of the remaining data sets. At least some of the quantized data sets are then entropy encoded.
摘要翻译： 为了使数字复合彩色视频信号（NTSC或PAL）能够被直接压缩，即不将其划分成其组件并分别压缩组件，数字复合彩色视频信号例如通过空间子带滤波去相关， 以形成表示直流亮度信息，交流亮度信息和直流色度信息的数据组，例如子带。 然后根据来自量化矩阵的相应量化值量化数据组，这些量化值使得直流亮度信息和直流色度信息至少主要地对数据集中的每一个的量化量 限制小于剩余数据集的量化量的平均值。 至少一些量化数据集然后被熵编码。
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公开(公告)号：US5613091A
公开(公告)日：1997-03-18
申请号：US141609
申请日：1993-10-27
CPC分类号： H04N19/00 , H04N19/129 , H04N19/15 , H04N19/186 , H04N19/63 , H04N19/70 , H04N19/98
摘要： A signal processing system includes a compression encoder 16 for compressing an input block of data samples including a plurality of sub-blocks, each sub-block including an array of data samples, into a block of compressed data. A sequencer 14' accesses the data samples of the input block to be passed to the compression encoder 16 with the sub-blocks being accessed in a predetermined first order and the data samples within each sub-block being accessed in a predetermined pseudo-random order such that successively accessed locations in the array of samples for a sub-block are scattered throughout that sub-block. The pseudo random accessing sequence enables occupancy of a buffer 73 for the compressed data block to be linearised. The sequencer can include a counter 62, the output of which addresses a look-up table 65 for generating the pseudo-random sequence in a repeatable manner.
摘要翻译： 信号处理系统包括压缩编码器16，用于将包括多个子块的数据样本的输入块压缩到包含数据样本阵列的每个子块中，以压缩数据块。 定序器14'以预定的第一顺序访问要传送到压缩编码器16的输入块的数据样本，并以预定的伪随机顺序访问每个子块内的数据采样 使得用于子块的样本阵列中的连续访问的位置分散在该子块中。 伪随机访问序列使压缩数据块的缓冲器73的占用被线性化。 定序器可以包括计数器62，其输出端寻址用于以可重复的方式生成伪随机序列的查找表65。
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公开(公告)号：US5260781A
公开(公告)日：1993-11-09
申请号：US885853
申请日：1992-05-20
CPC分类号： H04N19/136 , H04N19/129 , H04N19/176 , H04N19/63 , H04N19/13 , H04N19/91
摘要： A data compression system in which decorrelated data is fed to an entropy encoder (20) in batches having an internal monotonic decrease in average information content from start to end. This results in longer zero runs and more rapid attainment of end of block codes. A data sequencing circuit (18) comprising nested inter-sub band (60) and intra-sub band (72) counters for use with sub band filtered video data is also described.
摘要翻译： 一种数据压缩系统，其中去相关数据被批量地馈送到熵编码器（20），其具有从开始到结束的平均信息内容的内部单调降低。 这导致更长的零运行和更快速地获得块代码的结束。 还描述了包括用于与子带滤波的视频数据一起使用的嵌套子频带（60）和子频带（72）计数器的数据排序电路（18）。
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