| With the development of science and technology, the infrared thermal imaging technology have been increasingly used in the military and civilian field. In particular the uncooled infrared imaging system with its low cost, high reliability, small size, and low power consumption plays a key role in the development of infrared thermal imaging systems. Traditional refrigeration type infrared detection system refrigerator is expensive, bulky and high powered, which prevents the wide use of the infrared imaging system. To reduce the cost, size, power consumption and enhance the reliability, we use the uncooled infrared imaging system, and implement it based on FPGA, so that the infrared imaging system can be used more widely.The system uses a single FPGA system architecture. Infrared image processing algorithms is implemented by hardwared control logic, which greatly improves the real-time image processing speed and effectively reduce the circuit size. The FPGA systerm consists of uncooled infrared detector module, field programmable gate array(FPGA) signal processing module, image storage module and video display module. It can realize data acquisition, processing and real-time displaying of infrared image (size of the detector640×480, spectral response8-14μm).With the limitation of the infrared detector material and technological level, the detection units of uncooled infrared focal plane array (IRFPA) have nonuniform response characteristics, and there are blind pixels in the image. In view of the above two problems, we have studied the nonuniformity correction and blind element interpolation algorithm. Flow process design by FPGA is proposed for non-uniformity correction, which has a higher efficiency, better real-time, compared with DSP technology. |
