Image Hash method using pseudo-random block and SVD
Guan Yajuan · Computer Engineering and Applications Journal · 2012
A secure and robust image Hash method is proposed based on wavelet transform,pseudo-random block and singular value decomposition. After wavelet transform sub-band is divided into overlapping sub-image blocks,so that the main information of image can be obtained,and the smaller block of tampering with regional information may be obtained by the overlapping block. By pseudorandom dividing and pseudo-random scrambling,Hash cannot be forged without the key,so security of Hash is enhanced. Experimental results show that the proposed method is robust to content-preserving modifications such as JPEG compression,median filtering,additive noise,distortion,re-scaling and the slight geometry transformation,and it is sensitive to different contents and the operation of localized tampering.