一种基于小波变换的数字图像加密算法

Study on digital arithmetic of image based on wavelet transforms

小波变换在时域和频域上同时具有良好的局部化性质,并对各种信号特征进行多分辨率分析有极大的适应性,已广泛用于信号与图像处理、语言识别与合成等科技领域.在二维离散小波变换及MATLAB快速算法的基础上,分析了在二维离散小波变换后的图像中加入数字水印成分,并利用反变换将其还原回原始图像,原始图像失真小,还原数字水印信息失真小,可以有效的应用在数字水印技术中.

The wavelet transform is localized in both time domain and frequency domain, adaptable for multi-differentiation analysis of many signal features. It is widely applied in processing of signal and image, language identification and combination. Based on the quick arithmetic of 2-D DWT and MATLAB, analyzed the digital watermark inserted in the image after 2-D DWT, and performed a reverse transform. The original image encounters less loss and there is less loss to watermark information. This arithmetic is effective in digital watermark technique.