Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan, ROC.
IEEE Trans Image Process. 2010 Aug;19(8):2056-69. doi: 10.1109/TIP.2010.2045709. Epub 2010 Mar 15.
In this paper, a watermarking scheme, called majority-parity-guided error-diffused block truncation coding (MPG-EDBTC), is proposed to achieve high image quality and embedding capacity. EDBTC exploits the error diffusion to effectively reduce blocking effect and false contour which inherently exhibit in traditional BTC. In addition, the coding efficiency is significantly improved by replacing high and low means evaluation with extreme values substitution. The proposed MPG-EDBTC embeds a watermark simultaneously during compression by evaluating the parity value in a predefined parity-check region (PCR). As documented in the experimental results, the proposed scheme can provide good robustness, image quality, and processing efficiency. Finally, the proposed MPG-EDBTC is extended to embed multiple watermarks and achieves excellent image quality, robustness, and capacity. Nowadays, most multimedia is compressed before it is stored. It is more appropriate to embed information such as watermarks during compression. The proposed method has been proved to solve effectively the inherent problems in traditional BTC, and provide excellent performance in watermark embedding.
本文提出了一种水印方案，称为多数奇偶校验引导误差扩散块截断编码（MPG-EDBTC），以实现高质量和大容量的嵌入。EDBTC 利用误差扩散有效地减少了传统 BTC 中固有的块效应和伪轮廓。此外，通过用极值替换代替高低均值评估，大大提高了编码效率。所提出的 MPG-EDBTC 通过在预定义的奇偶校验区域 (PCR) 中评估奇偶校验值，在压缩过程中同时嵌入水印。如实验结果所述，所提出的方案可以提供良好的鲁棒性、图像质量和处理效率。最后，将所提出的 MPG-EDBTC 扩展到嵌入多个水印，并实现了优异的图像质量、鲁棒性和容量。如今，大多数多媒体在存储之前都进行了压缩。在压缩过程中嵌入水印等信息更为合适。所提出的方法已被证明有效地解决了传统 BTC 中的固有问题，并在水印嵌入方面提供了出色的性能。
