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1. 发明授权

US07542616B2 Apparatus and method for compressing image data 失效
标题翻译：用于压缩图像数据的装置和方法
公开(公告)号：US07542616B2
公开(公告)日：2009-06-02
申请号：US10721389
申请日：2003-11-25
申请人： Masahiko Hatanaka , Hisayoshi Zenke , Shusuke Miyaji
发明人： Masahiko Hatanaka , Hisayoshi Zenke , Shusuke Miyaji
IPC分类号： G06K9/36
CPC分类号： H04N19/124 , H04N19/149 , H04N19/15 , H04N19/172 , H04N19/194 , H04N19/60
摘要： An image data compressing apparatus includes an image data compressor for compressing image data input thereto at first and second compression rates to produce first and second compressed data, respectively, an approximate-expression selector having an approximate-expression table including approximate expressions corresponding to sample data sizes, respectively, and a compression rate determining unit for determining the second compression rate. The approximate-expression selector selects an approximate expression from the approximate expressions. The first approximate expression corresponds to a first sample data size nearest a data size of the first compressed data among the sample data sizes. Each of the approximate expressions indicates a change of a data size in response to a compression rate. The compression rate determining unit determines the second compression rate based on the selected approximate expression. The image data compressing apparatus provides a desired size of the compressed image data by maximum two of the compressing operations.
摘要翻译：图像数据压缩装置包括图像数据压缩器，用于分别以第一和第二压缩率压缩输入到其中的图像数据，以分别产生第一和第二压缩数据;近似表达式选择器，具有包括与样本数据相对应的近似表达式的近似表达式表以及压缩率确定单元，用于确定第二压缩率。近似表达式选择器从近似表达式中选择近似表达式。第一近似表达式对应于样本数据大小中最接近第一压缩数据的数据大小的第一样本数据大小。每个近似表达式表示响应于压缩率的数据大小的改变。压缩率确定单元基于所选择的近似表达式来确定第二压缩率。图像数据压缩装置通过最多两个压缩操作来提供压缩图像数据的期望大小。

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