Video Watermark System Based On DSP

Video Watermark is used for copyright protection of digital video production. As for important method of copyright protection, digital watermark technology have been widely researched and used, but practical digital watermark technology based on video colorized image is not enough. The video watermark arithmetic has the request of processing continuous frames in real-time and availability of playing video naturally. According to the characteristic of human vision system and YCbCr video signal which used for capturing realtime image, the watermark signal can be embedded in coefficient of DCT transform of carrier's luminance. YCbCr colorized system is accord with the characteristic of HVS and used for JPEG system. With watermark embedded in coefficient of DCT transform, it can avoid abundance calculation and satisfied the requst of HVS.With the rapid development of image process technology and DSP, a growing number of DSP chips are used in image processing. The image processing algorithm and software designing is the main problems in this research. As for the vital algorithm of DCT and IDCT transform, the algorithm speed is most import in the system. How to select a rapid DCT and IDCT algorithm and take full advantage of the DSP hardware structures and powerful instructions to realize the two-dimensional DCT and IDCT rapid algorithms is the linchpin in this paper.In the paper, we first provided an overview of video watermark significance, characteristics, development and so on. Then we simplely introduced the features and development of DSP, highlighting the features and programming methods TMS320C6713. Video watermark algorithm is the focus of this research, through compare multiple watermark algorithms, we adopt digital watermark embedded algorithm which based on DCT frequency transformation algorithm. With the Winograd algorithm, the complicated eight points DCT and IDCT transform is simplified into simple addition andmultiplication, which according with hardware characteristics of DSP. Utilizing the parallelism of very long instruction wordarchitecture and pipeline execution to achieve high speed performance, the realtime image watermarking is well embedded. In hardware system, using the high-speed FIFO and high-speed transmission of DSP's QDMA, completed the high-speed video capturing. Through the use of USB2.0 high-speed transmission and high-speed host computer interface of DSP's HPI, completed the high-speed video display. With the capture and display processing running in background of dsp system, a real-time floating point watermark embedded algorithm is well completed in entire system design.In this paper, the main Characteristics is that the Real-time watermarking algorithm is realized in float DSP image processing system. We run our code on DSP platform, the result indicate that image measurement system is a real-time system which can meet common application's requirements.