中文说明：对比dct和dwt在图像数字水印应用中的特点，分析其特性。
English Description：
Compare the characteristics of DCT and DWT in the application of image digital watermarking, and analyze their characteristics.
Compare the characteristics of DCT and DWT in the application of image digital watermarking
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中文说明：对比dct和dwt在图像数字水印应用中的特点，分析其特性。
English Description：
Compare the characteristics of DCT and DWT in the application of image digital watermarking, and analyze their characteristics.