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:
Feb. 03, 2004
Filed:
Feb. 07, 2000
Russell A. Brown, Palo Alto, CA (US);
Sun Microsystems, Inc., Palo Alto, CA (US);
Abstract
The present invention is a compression scheme for compressing audio and video data. An image is divided into blocks of pixels. In one test, if all of the pixels are approximately equal to the corresponding pixels in the previous block, then no data is sent for that block. In a second test, if all of the pixels in a block are approximately equal to a mean pixel value, then only one color value is transmitted. In a third test, if quantization of the pixels via companding results in an acceptable representation, the quantization is performed. The present invention uses quantization codes that are proportional to the logarithm of the magnitude of the range quantized, computation of a magnitude byte that permits rapid discovery of the number of bits used for quantization of a block, recursive packing and unpacking of quantized pixel data, and two-dimensional paths through the block.