Design of retina-like scanning system based on distortion effect of lens

Retina-like scanning has the advantages of rotation and scale invariance, redundant data compression and variable resolution information acquisition. The traditional method of retina-like scanning has the disadvantages of complex system structure and slow scanning speed. Therefore, a method of retina-like scanning based on the distortion of lens and rotation of Abbe prism was proposed to realize the scanning ring growth and target field scanning. The distortion of lens could enlarge the incident spot with different fields of view to realize the retina-like spots structure. The initial parameters of the lens were solved by the objective-image relationship, and the aspheric parameters of the lens could be optimized with the growth coefficient between the rings of the scanning spot as the objective function of lens distortion optimization. The focal length of this system is 14.24 mm and the working distance is 25 mm. The simulation results show that the retina-like scanning with 16 circles can be realized on the image plane with the diameter of 27.66 mm, when the incident laser is a 1×16 linear array laser with the height of 20 mm. And the maximum ring growth coefficient of the scanning spots is 1.08. Compared with the retina-like scanning system, this method has the advantages of low cost, simple structure and fast scanning speed.