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:
Sep. 07, 2010
Filed:
Apr. 25, 2007
Chao-ho Chen, Tai-Nan, TW;
Chung-yih Lee, Taipei, TW;
Chao-Ho Chen, Tai-Nan, TW;
Chung-Yih Lee, Taipei, TW;
Huper Laboratories Co., Ltd., Jong-Shan District, Taipei, TW;
Abstract
A method of effective image authentication and image restoration by hiding watermarks in DCT (Discrete Cosine Transform) coefficients is presented. The basic concept is to embed the selected significant watermarking bits for authentication and restoration into the selected medium- and low-frequency DCT coefficients. Thus, the illegally tampered regions can be detected, and then the original information in that region can be extracted for restoration. Experimental results show that the proposed authentication and restoration techniques can be applied to a DVR (Digital Video Recorder) system, in which no original image information is involved, and it can effectively detect the illegally tampered region and restore the tampered region in the human visual perceptual quality by only using a little embedded original information.