Robust CRT-based watermarking technique for authentication of image and document

The advent of the Internet and the wide availability of computers, scanners, and printers make digital data acquisition, exchange, and transmission as simple tasks. However, making digital data accessible to others through networks also creates opportunities for malicious parties to make salable copies of copyrighted content without permission of the content owner. Digital watermarking techniques have been proposed as a solution to the problem of copyright protection of multimedia data in network environments. In this paper, we propose a novel CRT-based technique for digital watermarking and also look into increasing the capacity of watermark embedding in the host images. The proposed CRT-based technique, besides being computationally efficient, is also more resistant to different types of attacks together with a significant reduction in processing time and minimal distortion of the original image. Experimental results have shown that the performance of the new scheme is superior in both the quality of the extracted watermark and processing times in comparison to the two existing SVD-based watermarking techniques.