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:
Apr. 10, 2012
Filed:
Dec. 21, 2006
Toshiyuki Sasahara, Miyagi, JP;
Kazuhiko Kikuchi, Miyagi, JP;
Kazuhiro Sunagawa, Miyagi, JP;
Yoshinobu Watanabe, Kanagawa, JP;
Toshiyuki Sasahara, Miyagi, JP;
Kazuhiko Kikuchi, Miyagi, JP;
Kazuhiro Sunagawa, Miyagi, JP;
Yoshinobu Watanabe, Kanagawa, JP;
Panasonic Corporation, Osaka, JP;
Abstract
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.