Digital Image Watermarking using DCT and Zip Compression Technique
With the exponential growth of internet and high speed networks operating throughout the world it is a challenging task to protect copyright of an individual’s creation. In this paper, a spread-spectrum-like discrete cosine transform (DCT) domain watermarking technique for copyright protection of still digital images is analyzed. In our approach, the watermark is embedded in the mid frequency band of the DCT blocks only in the sub band which is carrying low frequency components and the high frequency sub band components remain untouched. With this approach we are developing an application for copyright protection and X-ray medical application too .For further security we are using ZIP Compression Technique. In effect, the main purpose of image compression is to trim down redundancy of the image data in order to be able to store or transmit data in an efficient form.
