一种用于JPEG图像的高容量可逆水印算法

提出一种用于JPEG图像的高容量可逆水印算法 。该算法利用JPEG图像DCT系数的零系数间隔确定修改的位置，利用间隔中零系数的个数确 定水印嵌入量，进而嵌入水印信息。这样做不会带来如位置图等任何额外信息 。该算法利用零系数间隔准确地提取水印，并能在水印提取后无损地恢复原始JPEG图像。实 验结果表明，该算法在嵌入大量水印信息的情况下仍能取得满意的PSNR值，且图像文件大小 的增加较小。

High Capacity Reversible Watermarking Scheme for JPEG Images

A high capacity reversible watermarking algorithm for JPEG images is proposed. The al gorithm determines the embedding positions with the zero coefficients intervals of DCT coefficients in JPEG images. The embedding capacity is calculated based o n the zero values number in each interval. Moreover, it brings no additional information, e.g. the locatio n map. According to the zero coefficients intervals, watermark information can be extracted accurately, and the original image can be recovered losslessly. Exp erimental results show that the algorithm can obtain the watermarked images wit h high perceptual quality and high capacity, and the increment of image file siz e is smaller than other reversible watermarking schemes for JPEG images.