Title: Method for local non-linear geometric attack resisting watermark based on image phase characteristic
Application Number: 200610137067 Application Date: 2006.10.16
Publication Number: 1932879 Publication Date: 2007.03.21
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G06T1/00
Applicant(s) Name: Li Jingbing Address:
Inventor(s) Name:
Attorney & Agent: mozhen
Abstract:
    A figure watermark technology based on image phase character belongs to multimedia signal dispose field. The first step is to embed the watermark: (1) pick up one vector standing for original image phase character, in the phase sub-space through DFT transform; (2) get one two-valued logic list through Hash function for the phase feature vector and the watermark. The extraction of watermark includes the follows- (3) get phase feature vector to the image by DFT transform; (4) pick up the watermark through Hash function and two-valued logic list. It is the figure watermark technology based on image phase character with stronger ability to resist local non-linearity geometry attack.
Time: 9