Research On Active Non-uniformity Correction Method For Infrared Images

In recent years,infrared imaging technology is widely used in national security,night vision and other fields.Because of the limitation of the material and technology of the infrared focal plane array,it is inevitable that the image is inhomogeneous,which makes the necessary details submerged in the noise,thus affecting the visual observation,so it is necessary to process the infrared image.At present,infrared image processing algorithms are mainly divided into two categories: scene based and calibration based.However,these two kinds of algorithms have their own limitations in the correction process.Based on this,this paper studies the limitations of two kinds of algorithms in the correction process.In the process of calibration based algorithm,the blank is usually used to update the calibration parameters,resulting in the phenomenon of "pot cover" in the middle of the image,which is dark and bright around,so a new structure is needed to solve the problem.In order to solve this problem,this paper puts forward a correction method of built-in baffle,which is built into the infrared optical system,and a multi-functional trigger button is set on the lens body,so as to realize the active control of the cutting in and cutting out of the baffle.Experimental results show that this method can solve the problem of "pot cover" in images.On the basis of the above structure,the control method of the built-in blank is improved,and the method of controlling the blank based on the electronic bayonet is proposed.The cut in and cut out of the blank is controlled by the contact of the end face of the infrared movement core and the end face of the infrared lens,so as to realize the simple and effective control of the blank.The algorithm based on scene class must depend on the motion of scene in the process of correction.In response to this need,this paper proposes a method of active motion control for the scene.An optical plate is added between the focal plane array and the infrared optical system.By changing the angle between the normal vector of the optical plate and the normal vector of the focal plane,the relative motion between the target scene and the focal plane is realized.The practicability of this method is proved by ZEMAX simulation.Based on the analysis of the above structure,the row and column projection algorithm is used as the basis,and the motion detection link is added to the algorithm for simulation verification.The results show that when the active motion control is carried out,all indicators are greatly improved.