Research And Design Of The Image Identification System In Bill Sorter

Paper currency recognition is a kind of technology about image processing which is widely used at present. It has a wide market prospect and development space especially in bank. The bill sortors which are used in optical financial facility widely provide most strick demand about the bill image recognition and processing technolugy. The key point of studying the bill sortor system is the design of hardware circuit and high efficient recognition algorithm. This thesis makes a deep research on these problems. Finally, a kind of hardware circuit and its corresponding recognition method for paper currency are provided in this thesis. The system can meet the technology level of real time and accuracy.In the design of test system hardware circuit, the technologies of CIS, complex programmable logic device (CPLD) and digital signal processor (DSP) are combined. After high speed collection through CIS and conversion with A/D, the bill image datas are saved in the DSP space, selected TI compony TMS320C6711 as DSP, which used high speed digital signal processing function fully, and the DSP gives the image datas a series of disposal in order to realize the recognition and separation. Selected Xilinx compony XC95144 as CPLD, which used high speed logic signal processing function fully, and the CPLD provides the clock and logical signals for the whole system.In the bill image recognition arithmetic design, digital image processing technique, pattern recognition and improved SOFM neural network are used to recognize the current 4th and 5th RMB images. The recognition method has a strong adaptability. It is based on the gray level feature of RMB images. After the steps of orientation, lean adjustment, measure of the size and extraction of the image feature, we can recognize its value, version, direction, deformity and dirty, etc. Furthmore, bill are recognized and sorted.As a result, the experiment proves that the bill sortor project system, its bill image test hardware circuit andbill image recognition arithmetic can meet the technology requirements, and it has high practical values.