Embedding and Extracting a Watermark in an Image using DCT

Abstract

The DCT watermarking algorithm has been implemented in this paper for the image cryptography. Security and capacity of watermarking data are important issues to be considered.  Number of researched are going in this field and major studies are going to increase capacity and security feature of a watermark. In this paper a new approach is to achieve capacity and security feature in watermarking. To enhance capacity feature, idea of branching or say nesting is being used. As per nesting concept, one watermark is inserted into another. This helps to increase the number of bit that can be included in watermarks.