A new lossless watermarking scheme based on DCT coefficients

Watermarking techniques have been proposed to solve the problem of copyright protection and authentication of digital media. In this paper, a robust blind lossless watermarking scheme is proposed that is based on similarity between DCT coefficients of original image and watermark. The watermark extraction procedure does not require the original image and extracts the watermark by using the secret key information. The experimental results showed that the proposed scheme was robust against various attacks such as JPEG compression, filtering, cropping, and additive Noise while the quality of extracted watermark was acceptable.