An auto-restorable semi-fragile watermarking algorithm for color image
Tan Chun-jia · Computer Engineering and Science · 2015
A semi-fragile digital watermarking algorithm for color image tamper detection and recovery is proposed.Firstly,the color image is converted from RGB space to YCbCr space.Secondly,recovery signals are extracted and embedded into the middle and high-frequency wavelet coefficients of the chrominance components(Cb and Cr),then the L+1level wavelet coefficients of the Ycomponent are modulated into detection watermarking,which will be embedded into the low frequency coefficient of the Ycomponent.When we authenticate,authentication watermarking is extracted from the Ycomponent,the tampered positions are identified,and then recovery singles are extracted from the Cband Crcomponents to restore the tampered areas.Simulation results show that our algorithm can not only be used in color image authentication and recovery but is also fragile to regular manipulation.