Image Watermarking Analysis: Using Discrete Cosine Transform and LSB Substitution
In this paper, the authors describe a new very accurate and reliable method that can detect watermarked image by LSB embedding in randomly scattered pixels in both 24-bit color images and 8-bit grayscale or color images, the LSB Modification and DCT are two techniques are analyzed by using various distortion metrics the methods for their robustness. Watermark is a "Secret message" that is embedded into a "Cover (original or host) message". Only the knowledge of a secret key allows them to extract the watermark from the cover message. Effectiveness of a watermarking algorithm is a function of it's: resilience to attacks, capacity and stealth.