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摘要：针对信息安全，提出基于Canny 边缘检测和2k 修正的信息隐藏算法。秘密信息仅
仅隐藏在边界像素上，首先利用Canny 边缘检测算子检测载体图像的边缘，然后利用伪随机数
序列对边缘像素进行重排。为了增强秘密信息的安全性，采用霍夫曼编码把秘密信息变成二进
制位流。每个像素隐藏的位数由其灰度值确定。最后，为了增强隐写图像的视觉效果，采用2k
修正法进一步减小隐写图像和载体图像之间的误差。实验证明提出的方法比LSB-2 和文献[12]
的方法更好。
Abstract: A new algorithm is proposed which is based on Canny edge detector and 2k correction.#br# Firstly, Canny edge detector is applied to detect the edge of cover image and only edge pixels are#br# selected for embedding payload. PRNG is used to randomize the edge pixels in order to enhance#br# security. Then Huffman encoding is practiced to code the secret data before embedded according to#br# Huffman table. Calculate coherent bit length L on the base of relevant edge pixels. Finally, the#br# method of 2k correction is applied to achieve better imperceptibility in stego image. The experiment#br# shows that the proposed method is better in PSNR and capacity than LSB-2 and scheme [12].
