Among the common applications of plenoptic cameras are depth reconstruction and post-shot refocusing. These require a calibration relating the camera-side light field to that of the scene. Numerous methods with this goal have been developed based on thin lens models for the plenoptic camera's main lens and microlenses. Our work addresses the often-overlooked role of the main lens exit pupil in these models and specifically in the decoding process of standard plenoptic camera (SPC) images. We formally deduce the connection between the refocusing distance and the resampling parameter for the decoded light field and provide an analysis of the errors that arise when the exit pupil is not considered. In addition, previous work is revisited with respect to the exit pupil's role and all theoretical results are validated through a ray-tracing-based simulation. With the public release of the evaluated SPC designs alongside our simulation and experimental data we aim to contribute to a more accurate and nuanced understanding of plenoptic camera optics.

翻译：全光相机的常见应用包括深度重建和拍摄后重对焦。这些应用需要建立相机侧光场与场景侧光场之间的标定关系。基于全光相机主透镜和微透镜的薄透镜模型，已有多种方法可达成该目标。本研究聚焦于主透镜出瞳在这些模型中常被忽视的作用，特别是在标准全光相机（SPC）图像解码过程中的影响。我们严格推导了重对焦距离与解码光场重采样参数之间的关联，并分析了忽略出瞳时产生的误差。此外，本文重新审视了先前工作中关于出瞳作用的研究，并通过基于光线追踪的仿真验证了所有理论结果。通过公开所评估的SPC设计方案、仿真数据及实验数据，我们旨在推动对全光相机光学更精准、更细致的理解。