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:
Dec. 11, 2007
Filed:
Sep. 30, 2003
Axel Becker, Cammeray, AU;
Stephen James Hardy, Leichhardt, AU;
David Dominique M Poulouin, Saint Donan, FR;
James Philip Andrew, Waverton, AU;
Andrew Peter Bradley, North Ryde, AU;
Axel Becker, Cammeray, AU;
Stephen James Hardy, Leichhardt, AU;
David Dominique M Poulouin, Saint Donan, FR;
James Philip Andrew, Waverton, AU;
Andrew Peter Bradley, North Ryde, AU;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of compressing a current image of a sequence of images is disclosed. Firstly, the current image is transformed with a predetermined transform such as the DWT to provide a set of transform coefficients (step). The method then retrieves (step), for at least one transform coefficient of a current image, a predetermined number of bits, preferably two, of a corresponding transform coefficient of a previously compressed image of the sequence. The corresponding transform coefficient is truncated at a truncation bitplane and the retrieved bits are the least significant bits of the truncated corresponding transform coefficient. The transform coefficient of the current image is set to a new value that is a function of the retrieved bits (step) and bits of the transform coefficients of the current image are stored for use in compressing one or more subsequent images of the sequence (step).