CAJ | 학술논문

为提供较大的隐写容量和保持良好的载密图像质量,提出一种基于视觉感知和菱形编码的图像隐写算法。根据人类视觉系统,针对人眼对图像的高中低灰度区、纹理区及平滑区的敏感度的不同,在不同区域选择嵌入不同数量的秘密信息；同时为了尽可能减少对图像像素值的改变,采用改进的菱形编码来嵌入秘密信息。实验结果表明,与HVS-OPAP算法相比,该算法图像的嵌入容量提高了4.09%,获取的隐写图像具有更好的不可感知性,同时峰值信噪比平均提高了1.5 dB,而且该算法具有抗RS隐写分析能力,安全性更高。
위제공교대적은사용량화보지량호적재밀도상질량,제출일충기우시각감지화릉형편마적도상은사산법。근거인류시각계통,침대인안대도상적고중저회도구、문리구급평활구적민감도적불동,재불동구역선택감입불동수량적비밀신식；동시위료진가능감소대도상상소치적개변,채용개진적릉형편마래감입비밀신식。실험결과표명,여HVS-OPAP산법상비,해산법도상적감입용량제고료4.09%,획취적은사도상구유경호적불가감지성,동시봉치신조비평균제고료1.5 dB,이차해산법구유항RS은사분석능력,안전성경고。
In order to provide larger capacity of the hidden secret messages and maintain a good visual quality of stego-image,a novel image steganography based on visual perception and Diamond Encoding( DE) is proposed. According to the Human Visual System(HVS),human eyes have different sensitivity on high gray areas,middle gray areas and low gray areas,texture areas and smooth areas. The different amounts of secret messages are embedded in the different areas of cover images. Especially,the modified DE is used to minimize the change of the image pixel value. Experimental results show that the proposed method can effectively improve the embedding capacity than HVS-OPAP algorithm by 4 . 09%, while stego-image has better imperceptibility, PSNR average of 1. 5 dB, and RS steganalysis methods can not detect whether the secret information is embedded,so it has a better security.