Cryptography in Digital Watermarking - A Wavelet based Contrast Sensitivity

Development of compression algorithm for multimedia data such as MPEG – ¾ and JPEG standards increase in the network data transmission speed have allowed use of applications. Digital multimedia data are spread or manipulating. It is necessary to protect and secure the data (image). The embedded data into original data to make ownership can also be captured with encryption and decryption techniques. It provides a better content of transmitted data. The decrypted image is larger in size than encrypted or original image as it is being initiated through the proposed theory using MATLAB.