Research On Extension Method Of Sight Distance In Photoelectric Telescope System

In recent years, with continuous progress of science and technology, the horizon of the monomer photoelectric telescope has reached the limit, and therefore, seeking method for extension of sight distance in photoelectric telescope system has certain research significance. The line of sight optical imaging system is often characterized by its own system and the detector surface element mutually. However, in the actual research and development for production, both the optical system itself and the size of the sensor have reached the limit of production, and it is very difficult to make any breakthrough. Moreover, in terms of their system hardware itself, it is also difficult to make any change due to the high economic costs and technical barriers. Thus, under this circumstance, this dissertation suggests multiple stitching methods to achieve the purpose of extension of sight distance without changing hardware conditions for a single photoelectric telescope itself.In this dissertation, the positional relationship between multiple sub-apertures and their distribution are firstly investigated, and the corresponding mathematical models of photoelectric telescope stitching are also established. Subsequently, experimental platform is set up and the measured images are obtained. Finally, the obtained images are processed by image fusion reconstruction algorithm based on wavelet transform. In conclusion, the images with higher spatial resolution make the extension of sight distance.In image feature matching, the SIFT feature matching algorithm is used for coarse matching. In order to reduce the wrong matching in the coarse matching, this dissertation proposes an improved correction scheme for purification through the criterion of distance ratio to sift the results of coarse matching. Traditional methods are also applied for comparison. It is proved that the scheme proposed in this dissertation is feasible and effective.After the final test of the full program, all the obtained results are analyzed by both subjective and objective aspects. It is demonstrated that the fused image is higher in resolution than a single sub-aperture imaging, proving that the use of stitching method is useful for extension of sight distance.