A novel iris biometric watermarking scheme is proposed focusing on iris recognition instead of the traditional watermark for increasing the security of the digital products. The preprocess of iris image is to be done firstly, which generates the iris biometric template from person's eye images. And then the templates are to be on discrete cosine transform; the value of the discrete cosine is encoded to BCH error control coding. The host image is divided into four areas equally correspondingly. The BCH codes are embedded in the singular values of each host image's coefficients which are obtained through discrete cosine transform (DCT). Numerical results reveal that proposed method can extract the watermark effectively and illustrate its security and robustness.
Abstract. The traditional watermark is replaced with a novel coding watermarking scheme, which is focusing on BCH error control coding for increasing the security of the digital products. The pretreatment of watermark image is to be done first of all; iris image is transferred into the binary sequence. And then the binary sequence is to be on discrete cosine transform, the value of the discrete cosine is encoded to BCH error control coding. The BCH codes are embedded into the coefficients of discrete wavelet-transformed host image. Many results show that proposed method can extract the watermark effectively and illustrate its security and robustness.
In order to solve the problems of the existing standard Brinell hardness machine such as low automation, the time-consuming indentation measurement and the human influence in indentation measurement, a calibration machine for reference block was designed. It shows that this machine can reduce the influence of the temperature difference between the hardness block and the measurement platform; it eliminates the time for the indentation measuring system to find the indentation and juxtapose it with the centre of the field of view and implements fully Brinell hardness automatic calibration.
Abstract.A novel digital watermarking scheme is proposed instead of the traditional watermarking. The binary watermark image is processed by error-correcting coding before it is embedded into the discrete wavelet-transformed host image. It is more effective to improve the security and robustness of the watermarked image by proposed scheme. Amount tests and results indicate that the proposed scheme have security and robustness against noise and commonly image processing methods such as Gaussian's noise, filtering, JPEG compression, and crop procession etc.
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