The Study And Realization Of Infrared Image System Non-uniformity Correction Algorithm Based On TMS320DM6437

The infrared thermal imaging technology, which is widely used in the military and civilian fields, has great potential. Imaging of infrared focal plane arrays (IRFPA) is the future developing direction of the infrared thermal imaging system. However, due to the limits of semiconductor materials and technology, IRFPA has the non-uniformity in each pixel unit. The performance of infrared imaging system was strongly influenced by the non-uniformity of IRFPA. In some extreme cases, the detecting ability of the infrared detector was even lost. Non-uniformity correction of IRFPA must be implemented in the practical application. Therefore, non-uniformity correction technology research has a high theoretical and practical value.At first, the main characteristics of infrared images and the causes of non-uniformity about infrared focal plane are introduced in the paper. Then the calibration-based and scene-based non-uniformity correction algorithms have been studied deeply. Principles, methods, merits and demerits were analyzed in detail for every algorithm. So on this basis, a non-uniformity correction algorithm called"S"curve in accordance with the nonlinear response feature of IRFPA is proposed. Then a comparative analysis of correction algorithms is made in the paper. The experiments show that 'S' curve correction algorithm can get better effect of non-uniformity correction in a large dynamic range.The final image quality was deeply affected by the blind-pixel, which is the extreme case of the non-uniformity of IRFPA. In this paper, the comparative study of various types of blind-pixel detection and compensation algorithm was given, and their advantages and disadvantages were also discussed. Finally, this paper presents a blind-pixel compensation algorithm based on space-time correlated. The experiments show that not only the small block of blind-pixel, but also the large block of blind-pixel can be compensated by blind-pixel compensation algorithm based on space-time.At last, the structure, working principle and design of the infrared imaging system based on TMS320DM6437 are introduced. And the implementations of blind-pixel processing and non-uniformity correction algorithms are discussed on the platform of TMS320DM6437. The experiments show that the system has the advantages of high computing speed, real-time, high processing-precision, large dynamic-range, strong commonality, etc.