关键词: 整数提升小波, 恢复水印, 篡改定位, 水印容量, 变容量

Abstract: In order to improve the recovery quality of tampered image, increasing watermark capacity is often used by traditional recovery watermark scheme. But it will lead to watermarked image quality decline. Aiming at the problem, image variable capacity recovery watermark scheme using integer lifting wavelet is proposed. According to the texture feature of 2×2 image block, the variable capacity recovery watermark is generated by using integer lifting wavelet transform coefficients, and embedded into the less significant bit planes of the other mapping image block after encrypted. Connecting with the adjacent block feature, tampered image is authenticated and recovered by using recovery watermark. Experimental results show that this scheme can well meet the requirement of watermark invisibility, and effectively resist attacks such as cropping attack, collage attack and daub attack, and better recover tampered image.

Key words: integer lifting wavelet, recovery watermark, tamper localization, watermark capacity, variable capacity