Research And Realization On Copyright Protection Of The Engieering Drawing Based On Blind-watermarking And Zero-watermarking

With the rapid development of network technology, the network manufacture has injected new vigor. The engineering drawing is extensively applied. However, the copyright protection has become bottleneck.The digital watermarking technique is an available tool to solve these problems. Presently, the algorithm on digital watermarking focuses on the gray image, audio and video digital watermarking, in the color drawing, people now use the normal algorithm of digital watermarking, zero-watermarking based on it, became research not very long. The research of the watermarking on the two-dimensional vector graphics is very little. Also, the thesis designs the architecture of copyright protection of the engineering drawing. The copyright protection system based on this architecture can resolve a series of problems on the copyright registration, such as copyright authentication, copyright dispute and so on.Aiming at the characteristics of two-dimensional vector graphics, this thesis proposes the blind-watermarking algorithm about it. The algorithm is based on Dual Tree complex wavelet transform. First we discrete distill the adumbration of the two-dimensional vector graphics, and then we use Dual Tree complex wavelet transform. After then, we choose the modulus of the lowest frequency, make the value of them into one or zero. With change the relationship of the pixel value of binary image, we achieve the watermarks embedding. And lots of experiments have shown the good imperceptibility and robustness under the attacks.Aiming at the digital watermarking algorithm based on color drawing. This thesis proposes a mothid of the"zero-watermarking"based on the color drawing. The"zero-watermarking"technology makes use of the major character of the color drawing to construct watermarking information. It does not have to change the major character of the color drawing. To decrease the relationship among the parts of the color drawing, the format of it was changed at first, which was changed from the format of RGB to YIQ. Then, this thesis uses DWT to the part of the brightness. After then, the thesis uses the lowest part of the frequency to construct"zero-watermarking". As the information of the zero-watermarking was created by the major character of the color drawing which was not changed when the information of zero-watermarking was created, so there is no conflict of the watermark rubost property and invisible property. And a lot of experiments have shown the better robustness and lower false alarm rate.