Public Watermarking Algorithm Based on Error-correcting Coding

摘要

With the rapid development of computer multimedia, how to protect digital products from being copied, pirated and juggled has been an urgent problem in the information security field. Digital watermarking is a new method to resolve the referred problems. This article proposes a public watermark embedding algorithm based on error-correcting coding, which can improve the correction of extracted watermark. It is processed in DCT domain in order to improve the robustness against JPEG compression. The experimental results indicate the watermarks are invisibility and robust in the algorithms(the extracted watermark's NC ≥ 0.88, the watermarked image's