Dsp-based Infrared Image Processing And Transmission System Research

The quality of infrared image is the most important factor which is used to evaluate the infrared image system, and the nonuniformity is the key restriction that prevents from improving the quality of the image. The nonuniformity correction is necessary in all infrared image system. The two-point correction, which is used widely now, can not make the quality of the image better because of the limitation of correction principle. At the same time, the infrared image system based on fiber transmission is more and more important in the monitor, detection ,and so on. Therefore, it has active meaning to research the infrared image system based on fiber transmission.The main research work and the achievement obtained include the following contents:Aiming at the nonlinearity of photoresponse that two-point correction do not consider, a new approach to nonuniformity correction was proposed, named"curve-beeline"correction. The new method has a good practicability as well as two-point correction, and performs more perfectly than two-point correction.Technology of digital signal process(DSP) is applied in nonuniformity correction process. The hardware system for nonuniformity correction of infrafed image is completed using TMS320DM642 as the main component, including the circuit for the video capture and display, the memory, the power source, the clock and the reset, and so on. At the same time, the hardware system for fiber transmission is completed using the HDMP-1032/34, CY7B923/33, and the FPGA.In the CCS, the drivers for the video capture and display of the TMS320DM642 are completed, the nonuniformity correction of the infrared image using the"curve-beeline"correction is realized, and the real-time process is achieved. In the Quartus II, the control program for the fiber transmission child system is completed using the VHDL program language, and the transmission is realized accurately and in high speed. At the same time, FIFO with Ping-Pong structure is designed to realize the interface in high speed between DSP and transmission system.The tests for the DSP image process and the fiber transmission system are presented, using the infrared camera designed by COERI. The testing results showed that the"curve-beeline"correction could improve the quality of the image evidently, and make the nonuniformity down to 1%; 17Mbytes/s for the transmission capacity of the system is achieved.