公开(公告)号：US20030113025A1

公开(公告)日：2003-06-19

申请号：US10251658

申请日：2002-09-19

Applicant: STMicroelectronics S.A.

Inventor： Jean-Michel Bard ,  Jean-Luc Danger ,  Lucas Hui ,  Christophe Cunat

IPC: G06K009/36 ,  G06K009/46 ,  G06K009/38

CPC classification number: H04N19/436 ,  H04N19/126 ,  H04N19/152 ,  H04N19/176 ,  H04N19/194 ,  H04N19/196 ,  H04N19/197 ,  H04N19/60

Abstract: Method of compressing a digital image signal in which a first quantization step set, which is unique for a given segment, is determined so that the number of bits needed to encode the quantized data corresponding to this segment is greater than a target value. This first quantization step set then being modified, as a priority, for the blocks of the segment for which the gain, in the course of this modification, on the reduction of the number of bits needed to encode the quantized data corresponding to the segment to which it belongs, is the highest. This modification is carried out, on as many blocks as is necessary for the number of bits of this segment to be less than or equal to the target value. Device to implement this method.

Abstract translation: 对数字图像信号进行压缩的方法，其中确定对于给定段是唯一的第一量化步长集合，使得对与该段对应的量化数据进行编码所需的位数大于目标值。 作为优先级，该第一量化步长作为优先级被修改为在该修改过程中增益对于其对应于该段的量化数据进行编码所需的位数减少的段的块 它属于哪个，是最高的。 在该段的位数小于或等于目标值所需的块上执行该修改。 设备实现这种方法。