基于LSB的JPEG灰度图像可逆信息隐藏方法  

Reversible Information Hiding Method of JPEG Grayscale Image Based on LSB

作　　者：肖丽丽 宋赫轩 林辉 王端 XIAO Lili;SONG Hexuan;LIN Hui;WANG Duan(Institute of Nuclear Industry,Beijing 102413,China;China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]核工业学院,北京102413 [2]中国原子能科学研究院,北京102413

出　　处：《自动化应用》2024年第10期188-192,共5页Automation Application

摘　　要：使用修改量化表等常规JPEG图像可逆信息隐藏方法,难以对抗格式转换造成的秘密信息丢失,例如,当JPEG转为PNG格式后再转回JPEG时,许多常规JPEG图像可逆信息隐藏方法都会失效。因此,探索了一种针对DCT量化前区块像素的改写模式,并利用LSB的思路将秘密信息嵌入JPEG灰度图像中。为了保证图片大小在隐写后的增加量在可控范围内,采用了先压缩控制图片大小再嵌入秘密信息的方式,确保了秘密信息能够被完整提取。结果表明,当嵌入8×8区块中靠近低频区域时,针对[0,0]或[1,1]或[2,2]单个位置的改写,与针对([0,0],[1,1])或([0,0],[2,2])2个位置的改写。与原始原图相比,最终得到的载密图片PSNR值均在50以上,SSIM值均在0.99以上,说明嵌入后的载密图片与原始图片相似程度很高,肉眼难以辨别。It is difficult to resist the loss of secret information caused by format conversion by using conventional JPEG reversible information hiding methods such as modified quantization table.For example,when JPEG is converted to PNG format and then converted back to JPEG format,many conventional JPEG reversible information hiding methods will fail.Therefore,a rewriting mode for pixels before DCT quantization is explored,and secret information is embedded into JPEG gray image by using LSB idea.In order to ensure that the increase in the size of the image after steganography is within a controllable range,a method of compressing and controlling image size before embedding secret information is adopted,ultimately ensuring that the secret information can be extracted completely.The results show that:When embedded in an 8x8 block near the low frequency region,rewriting a single position for[0,0]or[1,1]or[2,2]is performed,and rewriting two positions for([0,0],[1,1])or([0,0],[2,2])is performed.Compared with the initial original image,the PSNR value of the final steganographic image is above 50,and the SSIM value is above 0.99,indicating that the embedded steganographic image is very similar to the original image,and it is difficult for the naked eye to distinguish.

关 键 词：可逆信息隐藏 JPEG图像 灰度图像 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]