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:
Jan. 06, 2004
Filed:
Sep. 15, 1997
Kiminori Sugisaki, Kanagawa, JP;
Jason Fischl, Tokyo, JP;
Nobuaki Izumi, Chiba, JP;
Naofumi Yanagihara, Tokyo, JP;
Yuka Kiyama, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
A picture data compressing device has picture data divided by a blocking circuit in to a plurality of blocks, each block consisting of a pre-set number of pixels and shuffled by a shuffling circuit . The blocked and shuffled data is transformed by a DCT circuit into data in the frequency domain and re-quantized by a quantization circuit , thereby compressing the picture data. A red detector determines whether a block from the shuffling circuit is the red-based block. If the red detector detects a red-based block, a controller controls the quantization circuit so that the quantization step of the quantization circuit will become finer. Thus, the data of the red-based block susceptible to block distortion may be quantized with a finer quantization step for improving reproduction and alleviating block distortion.