Watermark Detection Technique on the Digital Image Using Discrete Fractional Fourier Transform (DFRFT)

Abstract

Watermark is a technique of information concealment into digital data. One of the aims to give watermark to the digital image is copyrights protection. Before process or duplicate the digital image ,needed some watermark detection to know the existence of watermarking in the digital image. We did it to appreciate the copyrights of someone for the ownership of digital image. The detection is done to know what is the digital image has been lable with watermark or not. In this research, detection watermark existence done with discrete fractional fourier transform (DFRFT). To know the existence from the watermark inside the digital image done with comparing the detection value with threshold. At simulation has done to attack process using rotation, noise, and cropping. The result of this research is giving information to user about the existence of watermark in the digital image. Key word : watermark, digital image, DFRFT, threshold