Abstract:

In order to authenticate the binary images, a fragile watermarking technique for image authentication and ownership verification is proposed. The pixels are firstly divided into two groups according to pixel spread difference (PSD), one is the “flippable” pixels and the other is the “unflippable” pixels. Then, the image block is permutated by a chaotic sequence. According to the encrypted ownership watermarks, the “flippable” pixels in the four parts of the image block are altered to get the watermarked image block. Experiments show the imperceptibility of the watermarking process, the proposed algorithm can successfully localize the content modifications, and protect the uniform regions that is the key problem in binary image authentication. The photonic crystal structures with excellent slow light properties can be achieved through designing the waveguide based on the conclusion.

Key words: image authentication, ownership verification, digital watermarking, binary images, chaos