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:
Mar. 18, 2003
Filed:
Aug. 13, 1999
Stephan D. Schaem, Fair Oaks, CA (US);
GlobalStreams, Inc., Clayton, MO (US);
Abstract
A method of compressing a video image comprising a two-dimensional array of pixels, the image being divided into an array of contiguous blocks, the method comprising the steps of: (1) calculating, for each pixel within a block, a difference between a predicted luminance and an actual luminance; (2) assigning a frequency characteristic to the block based on a magnitude of the differences of the pixels within the block; (3) determining, for each pixel within the block, a quantized difference code based on the calculated difference and the assigned frequency characteristic; and (4) storing the frequency characteristic of the block and the quantized difference codes for each pixel within the block; and wherein the step of assigning comprises calculating a sum of the squares of the differences of all pixels within the block, and selecting the frequency characteristic from a set of predetermined frequency characteristics based on the calculated sum.