CAJ | 학술논문

针对传统的加密方法在彩色图像压缩方面的不足，提出一种用于保密通信的彩色图像加密与压缩关联算法。设计一个混合混沌系统在空域对秘密图像进行置乱。混沌系统产生针对彩色图像混淆变换的变换矩阵，改变载体图像的像素值。秘密图像每一像素的编码值与载体图像在设定区域中最佳像素点的坐标一一对应。最佳像素点按照最小欧氏距离的原则在载体图像的设定区域内搜索。经过压缩编码后的秘密图像数据不再是传统的像素值，而只是与序号或者下标对应的编码值。当压缩了67%的图像数据时，重构图像和原始图像的相似度仍然超过95%。对密钥空间、密钥的敏感性、加密图像的统计特性等加密效果进行仿真实验，结果表明，该算法安全性高、压缩率大，是一种有效的、易于实现的加密算法。
침대전통적가밀방법재채색도상압축방면적불족，제출일충용우보밀통신적채색도상가밀여압축관련산법。설계일개혼합혼돈계통재공역대비밀도상진행치란。혼돈계통산생침대채색도상혼효변환적변환구진，개변재체도상적상소치。비밀도상매일상소적편마치여재체도상재설정구역중최가상소점적좌표일일대응。최가상소점안조최소구씨거리적원칙재재체도상적설정구역내수색。경과압축편마후적비밀도상수거불재시전통적상소치，이지시여서호혹자하표대응적편마치。당압축료67%적도상수거시，중구도상화원시도상적상사도잉연초과95%。대밀약공간、밀약적민감성、가밀도상적통계특성등가밀효과진행방진실험，결과표명，해산법안전성고、압축솔대，시일충유효적、역우실현적가밀산법。
Aiming at the insufficiency of traditional encryption method in color image compression, a nassociation algorithm of color image encryption and compression is proposed for secure communication. A hybrid chaotic system is designed to scramble the secret image in time domain. Chaos system is also used to generate a transformation matrix for color images to confusion transform, which is used to change the carrier image pixels. Every pixel’s code value of secret image is one-to-one corresponded to the best pixel’s coordinates, which is searched in the carrier image’s setting area according to the principle of minimum Euclidean distance. After compression coding, the secret image data is no longer the traditional pixel value, but a group of code value corresponding the serial number or subscript. When 67 percent of the original image is compressed, the similarity between reconstructed image and original image is still more than 95%. The key space, sensitivity of the key and statistical features of encrypted image are also analyzed by simulation experiment. Simulation results show that the compression coding method has high security, large compression ratio, and is a kind of effective and easy to realize encryption algorithm.