Research On Wide Laser Beam Detection Based On Double-lens Stitching

Since its inception,laser has been widely used in actual production and life due to its good directionality and monochromaticity.With the continuous development of science and technology,the wide field of view laser beam is also widely used in infrared laser fuze and other aspects.However,if you want to use the laser to the maximum,a necessary premise is to accurately detect the quality of the laser beam,so it is very important for the research of wide laser beam detection.In this paper,a detection system based on phase-dependent registration,dual-lens splicing rotation combined with additional marking points is used to realize the detection of a wide laser beam with a large field of view and no obvious feature points.This paper mainly includes the following parts:According to the wide laser beam parameters studied in this paper,the stitching scheme of the detection system is designed,and the theory of image stitching technology is deeply studied.According to its process,image stitching technology starts from three aspects: image preprocessing,image registration and image fusion.In this paper,image preprocessing mainly involves image noise reduction,gray compensation and distortion correction;Image registration currently has two technical methods based on regional gray and feature-based registration technology.In this paper,the first one is selected according to the actual situation,and the registration algorithm is improved accordingly;The image fusion selected the weighted average fusion algorithm with fade-in and fade-out based on specific experimental results.Considering the design difficulty of the large field of view lens,the dual-lens field of view stitching and rotation scheme for this subject was finally established.The performance index of the imaging objective lens is determined according to the structural parameters,and the CMOS module lens is designed and optimized using CODE V optical design software.The MTF curves of the objective lens in different fields of view are basically consistent and close to the diffraction limit.The root mean square value of the circle of confusion is smaller than the single pixel size of the selected detector,but the lens has a certain degree of barrel distortion.The final design result meets the design requirements after the post-correction.Finally,normalize the gray value of the dual lens to complete the optical system design and related experiments.On the basis of the phase correlation image registration algorithm determined in the above work combined with the added mark points,combined with the design results of the optical system,the final wide laser beam double-lens stitching detection algorithm was established,and simulated the dual-lens stitching algorithm with additional marking points.Finally the actual testing system was tested in the laboratory environment,and the factors affecting the stitching effect were analyzed and summarized,thus verifying that the wide laser beam testing system based on the double-lens stitching met the expected design requirements.