F-Number Adaptation for Maximizing the Sensor Usage of Light Field Cameras
Chuanpu Li, Xin Jin, Junke Li, Qionghai Dai · 2019
Since the effective imaging area in micro lens array (MLA) of the light field camera cannot completely cover the MLA plane, the imaging response of MLA cannot fully cover the sensor plane, which decreases the sensor usage. Hence, an f-number adaptation model is proposed to maximize the sensor usage without changing the structure of light field cameras. By deriving the relationship between the main lens f-number, the macropixel diameter and the sensor usage, a constrained concave optimization model is proposed. A pixel extraction method is also proposed to make a full use of the increased effective pixels. The experimental results demonstrate the effectiveness of the proposed model in terms of the effective pixel number, the subaperture number and improving 3D reconstruction quality. It is also robust to different light field camera architectures and different arrangements of MLA.