The present invention uses a computer to digitally watermark color images using wavelet transform and discrete cosine transform so that the watermark is invisibly inserted into the color image while the watermark is not damaged by compression, filtering, and truncation. It is about a method.;The present invention provides a method for converting a color image of an RGB mode into a YIQ mode by a conversion matrix, a discrete wavelet transform of a Y value of color image data converted into a YIQ mode, and a discrete cosine transform of a watermark of a general image. And converting the color image by converting the discrete wavelet transform into a watermark of the general image, and inversely converting the combined image by wavelet to generate a converted Y value among the color image data. And converting the converted Y value, the I value, and the Q value by an inverse transformation matrix to generate a color image in which the watermark of the RGB mode is inserted.;The digital watermarking method of the color image using the wavelet transform and the DCT transform of the present invention has a high watermark preservation for lossy compression and other image processing, and is a watermarking method for the color image, which has not been applied in the conventional method. Appropriate.
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