The principle of digital watermark is the method of adding digital watermark\nin the frequency domain. The digital watermark hides the watermark in digital\nmedia, such as image, voice, video, etc., so as to realize the functions of\ncopyright protection, and identity recognition. DCT for Discrete Cosine\nTransform is used to transform the image pixel value and the frequency domain\ncoefficient matrix to realize the embedding and extracting of the blind\nwatermark in the paper. After success, the image is attacked by white noise\nand Gaussian low-pass filtering. The result shows that the watermark signal\nembedded based on the DCT algorithm is relatively robust, and can effectively\nresist some attack methods that use signal distortion to destroy the watermark,\nand has good robustness and imperceptibility.
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