The Research Of Iris Recognition System Based On DSP

The iris recognition is a new biometrics recognition technology. It can reach the precision veracity. The high veracity of iris recognition is the special feature in numerous biometrics recognition technologies. It is paid attention to by more and more domestic and international relevant researchers because of high veracity and good economic benefits of iris recognition. It can not only be used in secret places, but also in the airport, bank, finance, police, entry and exit ports, security, network, e-business. The barrier for iris recognition in practice is its high cost.At first, the paper designed a cheap collection device for iris image. The device consists of a cheap CCD camera, visible light leds and infrared leds. The iris image in the CCD camera is very clear so that the demand of iris recognition is satisfied.Secondly, the paper developed the hardware and software of iris recognition device based on the DSP. The test of video-in , video-out, asynchronous serial interface(RS232), universal serial bus(USB) interface and others are completed on printed board. The software of I2C bus simulation, data transmission between two channels of EDMA, the logic control with CPLD, the booting and guiding of DSP, the interrupt program and others are tested.At last, the appraisal of iris image quality on the iris recognition system is discussed in the paper. A kind of evaluation method for iris image quality is introduced. And, the indexes of image clearity, eccentricity of inner and external boundaries and the iris visibility are discussed. Finally, the three indexes are synthesized into a comprehensive quality index for iris image. The experimental results are given. It shows that the true quality level of iris images can be represented by the comprehensive quality index of the iris picture exactly.