Research On Correction Method Of Infrared Aero-optical Thermal Radiation Effect

Aero-optic effect which has a great impact on the optical imaging detection system carried on the aircraft is produced by the interaction between inflow and optical dome during the flight of high-speed and ultra-high-speed aircraft.The aero-optic effect also greatly reduces the precise guidance and detection level of the aircraft.Therefore,the correction of aero-optical effects is of great significance to the development of aircraft science and technology,precision guidance technology and detection technology.And the correction method of aero-optical thermal radiation effect studied in this paper is a key link in the study of aero-optical correction.In this paper,through the research of related technologies,three methods about the correction of aero-optical thermal radiation effect are proposed.The first method is to apply the prior theory of dark channel to build the correction model and optimize the iterative solution by using the sparseness of dark channel in the degraded image of aero-optics thermal radiation.Compared with the classical correction methods of aero-optical thermal radiation effect,the experimental results show that the correction method of aero-optical thermal radiation effect based on dark channel prior theory can effectively calculate the pixel offset caused by thermal radiation effect and restore the image.The other method is to use the difference of gradient distribution information between the clear image and the aero-optical thermal radiation image,in addition,the low rank description is used to constrain again,so as to build a correction model of aero-optical thermal radiation effect and optimize its kernel norm.Compared with the classical image layering algorithm,the experimental results show that the algorithm can effectively separate the image into two layers,one is the thermal radiation effect layer,the other is the corrected image layer.The last method is to apply the image decomposition technique to the correction of aero-optical thermal radiation effect by using the difference between the frequency characteristics of the image and the aero-optical thermal radiation degradation image to build a calibration model and optimize the estimation.Finally,the degraded image is decomposed into low-frequency information representing aero-optical thermal radiation effect and high-frequency information representing clear image.Comparing with the advanced correction methods of aero-optical thermal radiation effect,the experimental results show that the proposed algorithm is effective in calculating the number of iterations and the degree of restoration.