CAJ | 학술논문

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。
제출일충용우JPEG도상적고용량가역수인산법。해산법이용JPEG도상DCT계수적령계수간격학정수개적위치，이용간격중령계수적개수학정수인감입량，진이감입수인신식。저양주불회대래여위치도등임하액외신식。해산법이용령계수간격준학지제취수인，병능재수인제취후무손지회복원시JPEG도상。실험결과표명，해산법재감입대량수인신식적정황하잉능취득만의적 PSNR치，차도상문건대소적증가교소。
A high‐capacity reversible watermarking algorithm for JPEG images is proposed .The algo‐rithm determines the embedding positions with the zero coefficients intervals of DCT coefficients in JPEG images .The embedding capacity is calculated based on the zero values number in each interval .Moreo‐ver ,it brings no additional information ,e .g .the location map .According to the zero coefficients inter‐vals ,watermark information can be extracted accurately ,and the original image can be recovered loss‐lessly .Experimental results show that the algorithm can obtain the watermarked images with high per‐ceptual quality and high capacity ,and the increment of image file size is smaller than other reversible wa‐termarking schemes for JPEG images .