公开(公告)号：US20090281425A1

公开(公告)日：2009-11-12

申请号：US12097854

申请日：2006-12-21

申请人： Toshiyuki Sasahara ,  Kazuhiko Kikuchi ,  Kazuhiro Sunagawa ,  Yoshinobu Watanabe

发明人： Toshiyuki Sasahara ,  Kazuhiko Kikuchi ,  Kazuhiro Sunagawa ,  Yoshinobu Watanabe

IPC分类号： A61B8/14 ,  G06K9/36

CPC分类号： H04N19/17 ,  G01S7/5206 ,  H04N19/124 ,  H04N19/176 ,  H04N19/60

摘要： An image compression unit includes a block divider 11 that divides image data into a plurality of blocks, a DCT portion 12 that subjects the image data of each block to DCT, a quantization factor output portion 15 that outputs a quantization factor as a numerical value indicative of fineness of quantization, a correction value computation portion 16 that computes a correction value that is determined uniquely according to a position of a block of image data, a quantizer 13 that quantizes the data having been subjected to DCT, based on a value obtained by multiplying the correction value by the quantization factor, and an encoder 14 that encodes the quantized data and outputs compressed data. This configuration makes it possible to provide an image compression/decompression unit that is capable of varying a compression ratio in a frame, without encoding compression parameters of each block.

摘要翻译： 图像压缩单元包括将图像数据分割成多个块的块分割器11，对每个块的图像数据进行DCT处理的DCT部分12，将量化因子作为数字值输出的量化因子输出部分15 量化精度的校正值计算部16，计算根据图像数据块的位置唯一地确定的校正值的校正值计算部16;量化器13，其对经过DCT的数据进行量化，基于由 将校正值乘以量化因子，以及编码器14，其对量化数据进行编码并输出压缩数据。 该配置使得可以提供能够改变帧中的压缩比的图像压缩/解压缩单元，而不对每个块的压缩参数进行编码。

公开(公告)号：US08155464B2

公开(公告)日：2012-04-10

申请号：US12097854

申请日：2006-12-21

申请人： Toshiyuki Sasahara ,  Kazuhiko Kikuchi ,  Kazuhiro Sunagawa ,  Yoshinobu Watanabe

发明人： Toshiyuki Sasahara ,  Kazuhiko Kikuchi ,  Kazuhiro Sunagawa ,  Yoshinobu Watanabe

IPC分类号： G06K9/36

CPC分类号： H04N19/17 ,  G01S7/5206 ,  H04N19/124 ,  H04N19/176 ,  H04N19/60

摘要： An image compression unit includes a block divider that divides image data into a plurality of blocks, a DCT portion that subjects the image data of each block to DCT, a quantization factor output portion that outputs a quantization factor as a numerical value indicative of fineness of quantization, a correction value computation portion that computes a correction value that is determined uniquely according to a position of a block of image data, a quantizer that quantizes the data having been subjected to DCT, based on a value obtained by multiplying the correction value by the quantization factor, and an encoder that encodes the quantized data and outputs compressed data. This configuration makes it possible to provide an image compression/decompression unit that is capable of varying a compression ratio in a frame, without encoding compression parameters of each block.

摘要翻译： 图像压缩单元包括将图像数据分割成多个块的块分割器，对每个块的图像数据进行DCT的DCT部分，将量化因子作为数字值输出的量化因子输出部分， 量化，校正值计算部分，其计算根据图像数据块的位置唯一地确定的校正值;量化器，其对经过DCT的数据进行量化，基于通过将校正值乘以 量化因子和编码量化数据并输出压缩数据的编码器。 该配置使得可以提供能够改变帧中的压缩比的图像压缩/解压缩单元，而不对每个块的压缩参数进行编码。