CAJ | 학술논문

利用图像块的小波对比度可以判定图像各像素的LSB(Least Significant Bit)嵌入深度,以提高嵌入容量并保持栽密图像的质量.提出了一种新的基于小渡对比度的密写方案,将图像块像素的低4位置0后进行小波变换并计算小波对比度作为嵌入深度的判决信息,由嵌入深度逐块逐像素密写.实验结果表明,该方法不仅保持了较高的嵌入容量,而且提取秘密信息时不需任何附加信息.
이용도상괴적소파대비도가이판정도상각상소적LSB(Least Significant Bit)감입심도,이제고감입용량병보지재밀도상적질량.제출료일충신적기우소도대비도적밀사방안,장도상괴상소적저4위치0후진행소파변환병계산소파대비도작위감입심도적판결신식,유감입심도축괴축상소밀사.실험결과표명,해방법불부보지료교고적감입용량,이차제취비밀신식시불수임하부가신식.
For steganography,using the wavelet contrast to decide the embedding depth in Least-Significant-Bit(LSB) can improve the hiding capacity and maintain a good visual quality of the stego-image.A new method is presented based on wavelet contrast.Firstly,the image is divided into blocks and set the least 4 bits of each pixel as 0,then decomposes with one-level wavelet transform to get the wavelet contrast and obtain the number of bit-planes for embedding.Finally,the secret information is embed-ded in LSB according to the different embedding length for each image block.The experimental results demonstrate the proposed method can hide large information,while maintain a good visual quality of the stego-image.Meanwhile,the embedded data can be extracted from the stego-image without any additional information.