A Novel Semi-fragile Authentication Watermarking Scheme of Color JPEG Image in Compressed Domain

A novel semi-fragile watermarking scheme of JPEG image in compressed domain is proposed. A chaotic map model based an authentication generating model is introduced. The DCT-transformed matrix of luminance plane in YCbCr color space is quantized by a modified quantized table. Then the low-frequency coefficients and location of each image block are used as the input of authentication generating model to generate binary authentication sequence. The sequence is embedded in the middle-frequency coefficients of each block after quantization. Finally, the authentication results are improved by a cross window. Experimental results illustrate that the watermarked image has good imperceptibility and could tolerate multiple cycles of JPEG compression. It is also sensitive to malicious manipulations and could localize those tampered regions correctly.