Design and implementation of the Middle Frequency Hefts Algorithm about Digital Image of DCT Domain

On the base of Fourier transformation and discrete cosine transformation of image considering the performance of discrete cosine transformation of image, technology of watermarks scrambled watermarks was analyzed, the Middle Frequency Hefts Algorithm Based on Digital Image of DCT Domain was designed. Because of the YCbCr color system according with human vision system, embedding watermark signals into carrier´s DTC coefficient of color heft could avoid a great deal of counts with the method of embedding multidimensional hefts as well as could achieve the demand of human vision system. The results show that, by embedding watermark signals into the middle frequency hefts, the robust is strong and the capability of this algorithm of resisting signals process, such as compressing, zooming and sampling is preferable.