The Research Of Color Image Copyright Protection Based On The Android Platform

With the popularity of the Internet and the rapid development of multimedia processing technology, sharing multimedia information has become the theme in the Internet age, but it comes with the security of digital information faces the severe challenges. So, the copyright protection network transmission of multimedia information has become a very important and challenging research topic. Under this background, it arises the digital watermarking technology. And it as an information hiding technique, the basic idea is to embed secret information into digital images, audio, video and other digital products, to achieve the effect of copyright protection, which has become a multimedia hot topic in the field of information security.At the same time, with the promotion of mobile communications market and the wide popularity of smart mobile devices, which makes the mobile phone has become the main way to obtain multimedia information. Currently, the Android platform becomes the hottest smart phone operating system because of its efficient open source and good user experience. Considering the information authenticity verification is the current focus, combines IMEI, IMSI and GPS position information with digital watermark, and proposes a method of generating watermark information based on IMEI, IMSI, and GPS position information. It can easily understand the image come from which phone, SIM card and access and publish geographic location of this image when extracted watermark information, which can improve the authenticity of the digital watermark. Therefore, take the Android phones for example, combined with digital watermarking technology, and use the IMEI+IMSI+GPS location information as watermark information, design and implement a system of copyright protection and applied to color images.The main research work of this paper is divided into the following sections:(1) Analysis the basic framework of digital watermarking system, which containing watermark generation, watermark embedding and watermark extraction. Take the image watermarking as the example, focuses on the typical digital watermarking algorithm, including spatial and transform domain algorithm, and expounds the performance evaluation of digital watermark, mainly including the robustness of the watermark and the subjective and objective assessment of the image distortion.(2) Take the color image as the example, combined with the relevant theoretical knowledge(discrete wavelet transform, discrete cosine transform and singular value decomposition), and improved a watermarking algorithm based on DWT-DCT-SVD of color images, and has carried on simulation analysis to the algorithm, which lays theoretical basis for the implementation on the Android mobile phone.(3) According to the function and performance requirements of the system, designed the system overall function, and used the Java language to complete the programming system main modules on the Eclipse platform, which include landing and registration module, image acquisition module, generating watermark information module, embedding and extracting watermark information modules and save module etc. At last, test and realization on the mobile phone.