Fragile watermarking with quality control for binary images
Chune Zhang, Zhengding Qiu · 2005
An improved and fragile watermarking scheme with quality control for binary images is proposed in this paper. In this paper, a secret key and a weight matrix are used to protect the hidden data. For an m/spl times/n block, our scheme can embed as high as /spl lfloor/log/sub 2/(mn+1)/spl rfloor/ bits of data at a cost of two pixels being flipped. Pixel flippability guides the whole scheme to control the watermarked image quality. A new measure is proposed to evaluate binary image quality. Shuffling is also adopted to improve the watermarking capacity and at the same time make the scheme more secure.