The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2008
Filed:
Sep. 27, 2004
Tetsuya Hayashi, Hanno, JP;
Tetsuya Hayashi, Hanno, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
An image compression device provided for effective utilization of the memory used for image storage and for attaining a reduction in the compression processing time of an image. An image quality evaluation value calculation section calculates the image quality evaluation value of the block for image quality evaluation value calculation which is compressed using four quantization tables in which the quantized data in each is different. A quantization table selection section calculates an approximation curve for approximations or supplies the image quality evaluation value of the block for image quality evaluation value calculation for each quantization table and from the calculated approximation curve further calculates a standard table value for practicable compression to reduce the file size without deterioration of the image quality. Subsequently, a quantization section compresses the original image data using the quantization table with the calculated standard table value.