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:
Jun. 14, 1994
Filed:
Jun. 02, 1992
Naofumi Yanagihara, Tokyo, JP;
Michio Nagai, Saitama, JP;
Sony Corporation, Tokyo, JP;
Abstract
Image data is encoded into sync blocks of fixed length and maximum data volume by dividing a vertical interval of image data samples, such as a field or frame of samples, into a plurality of blocks and deriving the orthogonal transform of the image data samples in each block. A block of conversion coefficients that are produced by the orthogonal transform are quantized with the same quantizing step to produce weighted, quantized conversion coefficients having a weighting factor that is a function of the visual activity of that block. Then, the weighted, quantized conversion coefficients of a block are variable length coded and the variable length codes of a predetermined number of blocks are combined into a sync block of fixed length.