The Color Image Digital Watermarking Algorithm Based on Coordinate Transformation and Quaternion Fourier Transform

With the rapid development of information technology and Internet technology, people can easily exchange transmit digital information, which not only brings convenience to people's work life, but also rampant piracy media. In face temptation that pirated media obtain huge benefits, some are desperate steal works without copyright sell spread them at will. this case, protection anti-theft version authentication very important measures solve current problems, watermarking(DW) is an method authentication, so it more concerned studied by researchers. This paper mainly studies color image DW algorithm based on coordinate transformation quaternion Fourier transform, including representation image, transform analysis, log polar transformation, watermark embedding extraction. Experimental results show in noise range, smaller compression ratio is, complete be extracted. When reaches 80%, completely