Application Research About Identity Authentication Based On DCT Watermarking

With the development of automation and information, an accurate and high effective personal identification is more important. Today the traditional methods of identification become more limited and more faulted, whereas Biometrics becomes the new development trend of the personal identification owing to its particular advantage. Automatic fingerprint identification system, a technology of fingerprint identification using the computer, is the hotspot of Biometrics. The thesis applies digital watermarking technology mainly. A invisible fingerprint watermark is embedded in the owner photo of the identification document holder. Similarity is used to distinguish true or false.By discrete cosine transform(DCT), still image compression coding technique, and human visual system(HVS), the 2-dimensional digital watermark(gray image) is embedded adaptively into the color host image, the original image is not needed. Experimental results show that the proposed watermarking scheme is invisible and robust against various signal processing such as compression, filtering and noise adding. Some possible research directions in the future is proposed.