CAJ | 학술논문

通过修改JPEG图像块中的DCT系数,提出一种新的稳健可逆信息隐藏方法。遍历块中特定位置连续6个DCT系数的均值,找出最接近0的均值进行嵌入。由于连续DCT系数的均值接近0,经过压缩操作不会有太大的变化,因此所嵌入的秘密信息有一定的稳健性。为了对抗攻击,在嵌入秘密信息时,通过比较并改变系数的大小,将改变量分为两个等级进行自适应嵌入。若含密图像未被压缩,则不仅可以正确提取秘密信息,而且可以恢复原始图像；若含密图像已被压缩,则只能正确提取秘密信息,不能恢复原始图像。实验结果表明,在经过质量因子为85以上的压缩攻击后,含密图像的视觉效果很好,并且仍能正确提取秘密信息。
통과수개JPEG도상괴중적DCT계수,제출일충신적은건가역신식은장방법。편력괴중특정위치련속6개DCT계수적균치,조출최접근0적균치진행감입。유우련속DCT계수적균치접근0,경과압축조작불회유태대적변화,인차소감입적비밀신식유일정적은건성。위료대항공격,재감입비밀신식시,통과비교병개변계수적대소,장개변량분위량개등급진행자괄응감입。약함밀도상미피압축,칙불부가이정학제취비밀신식,이차가이회복원시도상；약함밀도상이피압축,칙지능정학제취비밀신식,불능회복원시도상。실험결과표명,재경과질량인자위85이상적압축공격후,함밀도상적시각효과흔호,병차잉능정학제취비밀신식。
This paper proposes a robust reversible information hiding scheme based on DCT coe?cients modification in JPEG images. The mean of six consecutive DCT coef-ficients close to zero is found. Since the mean of these six coe?cients changes very little after compression, robustness can be achieved. The coe?cients are modified to embed in-formation using two different levels to resist attack. If the stego-image is not recompressed, the secret information can be correctly extracted, and the original image can be recovered. If the stego-image is recompressed, the secret information is still extractable without error, but the original image cannot be recovered. Experimental results show that the proposed scheme is effective after recompression attack with Q=85 or above, and the stego-images have good visual quality.