| Recent years, with the development of image sensors and digital-image-processing technology, the requirements of high-resolution images increase in the case of the industrial production, especially a large view of field. Panoramic imaging technology has been widely applied in machine vision, computer vision and virtual reality, and advanced panoramic imaging technology can promote the development in various fields.The traditional panoramic imaging technologies include multi-camera systems, rotary stitching, fish-eye lens, multi-faceted multi-angle lenses and pericentric lenses. But the hardware is complexity and expensive, the demanding of the image stitching technology is critical and not real-time imaging. This paper is to design a new kind of panoramic imaging device to overcome the traditional shortcomings and promote the development of computer vision technology.This dissertation presents a 360° panoramic imaging device for the columnar objects by ordinary camera lens and a mirror. The shape of the mirror is obtained by ellipse rotating around the long axis for 180°, which is get by single viewpoint constraint calculation. Mirror parameters are constrained by the camera depth of field, field of view angle and resolution. For a particular cylinder size, the optimum mirror should satisfy the camera depth of field constrai nts and the system resolution should reach 80% of the original camera resolution. The device is simulated by ZEMAX optical design software to determine the optimal panoramic imaging device according to the evaluation standards of image quality and the cont rast of the simulation results. Finally, the perspective projection panoramas are achieved by a systematic calibration method for omni-directional cameras.Compared to the traditional imaging device, this dissertation provides a 360° panoramic imaging device and mirror design method for machine vision. The designed panoramic imaging device is simple. The mirror-design method is accurate, low cost, low distortion and high imaging quality. |
