Research On Optical System Design Method For Light Field Imaging

Light field imaging technology is part of computational photography, a field that aims to improve capabilities and overcome limitations of conventional photography by combining imaging system design method and image reconstruction algorithm. The paper studies image formation model and refocusing algorithm of light field camera with microlens array, focusing on how to design plenoptic camera from the perspective of geometrical optics. The paper mainly includes the following work:First, the entire process of image formation and refocusing of light field photography with microlens array is simulated by tracing real ray and calculating spot diagram; Fast MTF measurement using ISO12233 slanted edge methodology is utilized to evaluate image quality.Second, based on the basic principle of digital refocusing, two algorithms are proposed:ray projection method and ray tracing method. Their advantages and disadvantages are compared.Third, by studying the image formation model of light field camera, factors affecting the resolution of refocusing image and depth of field of light filed camera are derived, which can help a designer to choose reasonable parameters of optical system.Fourth, refocusing results of plenoptic cameras with different parameters are simulated. The stop location, aberration and field of view of the main lens have proved to affect the refocusing image quality.