The Development Of Real-time Infrared Camera Video Image Processor

The quality of the infrared image can't be improved too much because of the limits of the detector's materials and the manufacturing technology in the first generation of Infrared Image System with 32 detectors. Two main problems are existed: First, because of the wide dynamic range of the display, the gray value of the most normal objects are distributed into the lower level to assure that the infrared image of certain high temperature objects can be displayed. So the gray value of the scene's infrared image is lower and it makes against watching normal objects from these images. On the other hand, the responsibility of the detectors is not consonant with each other, which causes the serious non-unification among the infrared detectors. The distinguishability of the image has been reduced, which will reduce the distance of the infrared system's operation at the same time. In this paper, it gives out an effective method to improve the performance of the infrared system based on the in-depth research about the feature of the detectors: to apply a DSP+FPGA based high-speed real-time digital signal processor to equalize the image's gray histogram and to correct the non-unification of the 32 detectors. The main content of this paper includes:Have an in-depth research in the theory of the digital image process. Based on the research mentioned above, it brings forward the scheme and the corresponding arithmetic of the real-time image process. Due to the scheme it also discusses the methods and standards how to choose the right devices used in this image process system. The main parameters and developing environments of these devices are listed, too.Design and debug the hardware of this real-time infrared image processor. In the paper, the function and the circuit design of every module in the system are discussed in detail. The diagrams of every module are also listed.Design the software of this infrared image processor. The software flow charts of every module in the processor are described in detail in the paper.The final goal to design the processor is to obtain an independent and built-in real-time infrared image processor. Based on the discussion above, the DSP+FPGA scheme, which can be implemented by the current technology, is an effective and no costly scheme. With the field practice of the infrared image processor, this scheme has achieved a satisfactory result.