A New Technique for Digital Image Watermarking

A New Technique for Digital Image Watermarking

Xiang-Sheng Wu

【期刊名称】《计算机科学技术学报（英文版）》 【年(卷),期】2005(020)006

【摘要】In this paper, a new technique is proposed for rotation, scaling and translation (RST) invariant image watermarking based on log-polar mappings (LPM) and phase-only filtering (POF). The watermark is embedded in the LPM of Fourier magnitude spectrum of the original image, and a small portion of resulting LPM spectrum is used to calculate the watermark positions. This technique avoids computing inverse log-polar mapping (ILPM) to preserve the quality of the watermarked image, and avoids exhaustive search to save computation time and reduce false detection. Experimental results demonstrate that the digital watermarking technique is invariant and robust to rotation, scaling, and translation transformation. 【总页数】6页(843-848)

【关键词】digital image watermarking;log-polar mapping 【作者】Xiang-Sheng Wu

【作者单位】Information Engineering Department, Guangdong Economics and Management College, Guangzhou 510400, P.R. China 【正文语种】中文 【中图分类】TP3