Study Of Infrared Image Processing And Transmission System Based On DSP

Infrared imaging technology is widely used in both military field and national economy field by means of finding, detecting and identifying the targets. With the emergence and development of the infrared focal plane arrays (IRFPA), infrared imaging technology becomes a technology which is developed in emphasis in many countries. However, due to several limiting factor, such as the production of materials and manufacturing processes and other factors, every detector on IRFPA can have different responses under the same stimulus, what is considered as the nonuniformity problem, which seriously affected the quality of infrared imaging. So it is an urgent task to research the high-efficient, real-time processing system of infrared image to obtain high-quality infrared images.The development of DSP technology has put the theory achievement of digital signal processing field into practical systems, at the same time it plays an important role in the field of image processing. The paper designs an infrared image processing system based on DSP, employing the TMS320VC5509A DSP as the core processor and giving the hardware and software design of system.The paper firstly analyzes the cause of the infrared images of nonuniformity, by discussion and comparison of several commonly used methods of nonuniformity correction, selected two-point algorithm, which is suitable for real-time implementation. Then designed the hardware processing platform based on 5509A, each module of the circuit design is introduced in detail, the hardware circuit of the system includes the function modules as image acquisition circuit, the memory extension circuit, the interface circuit of USB and the peripheral circuits. In the software design of system, firstly, introduced the timing logic control design of data acquisition on CPLD, showing the simulation waveform, and then completed the design of two-point correction algorithm, on this basis, to explore a method of gray-scale linear transformation that is suitable for the real-time system, simulating two kinds of arithmetics in the software platform. Then, the paper focuses on the software design of USB, including USB firmware, drivers, and applications.Finally, the system has been debugged, after repeated debugging and testing, the entire system can operation stable and reliable. Making the algorithm operate in the hardware system, experimental result verifies that two-point correction algorithm and linear gray transform algorithm can meet the real-time requirements, and the quality of processed image has greatly improved than the original image.