Thumrongrat Amornraksa and Rapee Puertpan

pp. 77 - 87

Abstract

Digital watermarking is a technique used to provide a proof of intellectual ownership by embedding a secret information, known as a watermark, into multimedia data. In this paper, a technique based on lumi nance averaging is proposed to improve the efficiency in the watermark retrieval process by minimizing the degradation of the watermarked image. In the experiments, we compared four different components con tained within the image; red, blue, green color components, and luminance component, to be used as a chan nel to carry the watermark signal. Moreover, three different techniques used to adjust the watermark amplitude, namely, Gaussian, Equal gain, and No pixel-weighting marks, were compared to observe their performance. The experimental results showed that applying Gaussian pixel-weighting marks technique in the blue color component gave the best performance.