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. 26, 2004
Filed:
Dec. 29, 2000
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an image encoding apparatus for receiving and encoding an image signal, the input image signal is encoded in units of blocks in accordance with an encoding parameter via a DCT device, quantizer, and variable-length encoder. The encoded codes are multiplexed together with information indicating the presence/absence of scrambling, authentication data, a quantization parameter used in the quantizer, and a quantization parameter obtained by converting this quantization parameter. A copyrighted image signal is scrambled upon encoding, an image decoding apparatus of an authentic viewer normally plays back, and an image decoding apparatus of an unauthentic viewer plays back an image with which the viewer can recognize its outline.