used to design fragile and semi-fragile watermarking by Abstract-In recent time watermarking technique becomes a keeping the chip rate smaller. The term chip rate in SS potential solution for copyright protection, authentication and watermarking indicates the number of cover signal's sample integrity verification of digital media. Among the widely used over which each watermark bit is spread [7]. Such image watermarking techniques, spread spectrum modulation based method becomes appealing due to its inherent advantage of watrmrking alithms wen de i nsatial domai greater robustness and is used widely for various applications.marovide falityof reale implementation tough Some watermarking applications, for example, digital television hardware realization. Hardware implementation of digital broadcasting, internet protocol television (IP-TV), etc. essentially watermarking offers advantages over software realization in demand development of low cost watermark algorithms in order terms of less area, low execution time, and less power [8], [9]. to implement in real-time environment. This paper proposes a If a chip is fitted in the digital devices, the output video or block based multiple bit spatial domain spread spectrum image images can be marked right at the origin although the same watermarking scheme where a gray scale watermark image is can be done using software after those videos or images represented by less number of binary digits using novel channel downloaded to the computer. But in this case embedding coding and spatial biphase modulation principle. VLSI software will take more time compared to hardware. The implementation using Field Programmable Gate Array (FPGA) example of TV broadcast will highlight the significance where has been developed for the algorithm and circuit can be . . integrated into the existing digital still camera framework. The digital media is to be marked in real time and hardware is the proposed image watermarking algorithm may be applied for only solution. VLSI architecture have been developed for authentication as well as secured communication in real time some of the digital image and video watermarking algorithms. environment. The objective of this paper is to develop an image Keywords-SS watermarking, channel coding, biphase modulation, watermarking algorithm that can serve the purpose of media FPGA, VLSI authentication as well as secured communication of a image like message signal in real time environment. This has been I. INTRODUCTION accomplished by exploiting the strong spatial correlation of the neighboring pixel values of the cover image. This Although it is easy to process, store and transmit almost noise c eiono relaties of the mSB (mos free digital multimedia signals through general purpose corlto. fesrltv saiiyo h S ms franee dig h modern di ital mlieisgnsthou gecne purose significant bit) planes of the gray levels against various image channel w processing operations and is used for watermark signal have to keep in mind about the emerging problems like representation....
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