Abstract: Based on the theory, which diversity can improve receiving performance greatly, color image is regarded as a communication channel with multi-channels. The meaningful watermark signals are modulated with sine wave. And then they are embedded into wavelet domain of 3 channels of the color image by characteristics of channels. In detection, based on the good effect of denoising and whitening to 1/f noise of wavelet transformation, a Rake receiver of watermarks is devised for the diversity. Experimental results show that the detection effect of Rake receiver is quite remarkable.

Key words: Wavelet transformation, Rake receiver, Watermark, Color image, Diversity

摘要： 利用分集接收能够大幅度地改善系统接收性能的原理，把彩色图像看成是多通道的通信信道，将有意义水印信号进行正弦调制，按照图像信道的特点分别嵌入到彩色图像3个通道的小波域中。在水印检测时，利用小波变换的良好去噪能力和对1/f噪声的良好白化效果，设计了水印的Rake接收机，以达到分集接收的目的。从实验结果看，RAKE接收机的效果十分突出。

关键词: 小波变换, Rake接收机, 水印, 彩色图像, 分集