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:
Oct. 28, 2003
Filed:
Feb. 02, 2000
Mikhail Shnaider, Ormond, AU;
Xing Zhang, New South Wales, AU;
Motorola, Inc., Schaumburg, IL (US);
Abstract
An image compression system ( ) having a wavelet transform module ( ) for decomposing an input image subdivided into blocks using a wavelet transformation utilizes a statistics generator ( ) to determine average statistics over several blocks to provide an indication of the activity of a current image block. This activity value is passed to a quantisation control module ( ) which determines quantisation parameters for a quantisation module ( ) which quantises the transform coefficients output from the wavelet transform module ( ). The quantised transform coefficients are the coded for onward transmission or storage by coder ( ). The quantisation control module ( ) also receives bit rate information for the current image block from a rate monitoring module, which determines the bit rate for the current block from a desired bit rate and information on the number of bits used for the previous image block.