Implementation for a Digital Watermarking Algorithm on Different Image Format Types

Abstract

Digital watermarking can be defined simply as hiding a message in a digital image, song or video. Watermarking is widely being used for many applications.  In this paper a secure image watermarking algorithm using array extraction from the original image will be implemented on different types of images using MATLAB code.  The algorithm was proposed to send a message through an image by extracting 5 binary arrays of size (1x5) containing 1 and 0 from that used image, and then the binary arrays would be updated in a way that they can carry the secret message of 5 letters or less. In this paper the same algorithm will be implemented by extracting first, 5 binary arrays of size (1x5) containing 1 and 0 from that image to send a message composed of 5 numbers, each number of two digits. Then extracting 6 binary arrays of size (1x6) containing 1 and 0 from the same image, and the binary arrays also would be updated in a way that they can carry the secret message of 6 numbers, each number of two digits. Also this algorithm by extracting 5 arrays or 6 arrays will be implemented on different image format types to find out what is the suitable image format to be used in this algorithm, with no noticeable image distortion or loss in its size, to ensure the algorithm strength and security to send secret numbers or passwords through images. The same algorithm will be implemented to send secret numbers. First by using the first 25 pixels from any used image by extracting 5 binary arrays of size (1x5), then by using the first 36 pixels from the same used image by extracting 6 binary arrays of size (1x6) and making a comparison between both results using MATLAB.