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. 27, 2007
Filed:
Sep. 29, 1998
James Philip Andrew, Waverton, AU;
James Philip Andrew, Waverton, AU;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of compressing data is disclosed including applying a transform to the data to produce transformed data having a series of parts; entropy encoding the magnitude of the transformed data of at least one of said parts; and separately encoding the value of said transformed data. Preferably said entropy encoding utilizes the number of non-zero coefficients surrounding a spatial location of a corresponding transformed data value and the entropy encoding can include encoding the number of leading zeros in transformed data values. The method further includes quantizing transformed portions of said data to integer values including a sign bit and a predetermined number of coefficient bits. Ideally, the preferred embodiment includes wavelet transforming the data with each of the sub-band components of the wavelet transform being separately entropy encoded. The present invention is ideally suited to the compression of image data.