Double Color Infrared Image Processing And Color Display System Design

Infrared imaging technology is widely used in military and civilian fields with lots of advantages. Infrared images of the different bands have their own special characteristics which could be a complement to each other. The image processed by pseudo-color technology with infrared images of different bands could pool their respective strengths to improve image quality and enhance target identification. So the dual-band infrared imaging technology is very hot the infrared study abroad in recent years. It is a priority to design a full set of dual-band infrared color imaging system because of the large lag between our country and western countries.Based on the mid-wave and long-wave dual-band infrared quantum detector, aim to solve the problems large volume and high power consumption of DSP+FPGA processing system, the FPGA system is designed with the embodied soft-core NIOS II which is the control and processing center. This system not only ensures the imaging results, but also meets the requirements of system. The overall design of dual-band infrared imaging system is introduced at first, including the power supply circuit, the drive circuit, the image processing circuit, etc. The voltage and current supply of the respective circuit unit and the main chip and its design is analyzed. The mid-wave signals and long-wave signals alternating readout drive timing is designed based on the detector’s multi-channel readout circuit. Also two gain correction methods are brought out and analyzed. In the image preprocessing subsystem, NISO II soft core is the control center of process flow and calculating center of complex algorithm. The details of NIOS II core’s operating steps and the specific implementation of the algorithms in the soft-core are introduced. The menu control function is designed by the method of character superimposing to solve the problem of manually controlling the image screen. The differences and the reasons for forming the differences are analyzed. A color display method is designed based on the differences between images of different bands. This method could not only highlight the high temperature target, but also save the details of background. Finally, the system is tested and the results prove the feasibility of the system design.