论文标题
基于投影模型分析的未关注光场相机的两步校准方法
A Two-step Calibration Method for Unfocused Light Field Camera Based on Projection Model Analysis
论文作者
论文摘要
准确校准光场相机对于其应用至关重要。在过去的几十年中，这一领域取得了迅速的进步。在本文中，首先对校准的最先进的投影模型进行了详细的分析，这些模型进一步解释了三个表示，包括射线和像素，3D物理点和像素之间的对应关系以及捕获的光场的3D物理点和3D信号之间。基于分析，将投影模型中的参数分组为方向参数集和深度参数集。然后，提出了每一组参数的两个步骤校准方法。所提出的方法能够将传统的摄像机校准方法重复使用方向参数集。进一步提出了简单的基于原始图像的深度参数集的校准。进行了系统的验证，以评估所提出的校准方法的性能。实验结果表明，在各种基准标准下，所提出的方法的准确性和鲁棒性优于其对应物。
Accurately calibrating light field camera is essential to its applications. Rapid progress has been made in this area in the past decades. In this paper, detailed analysis was first performed towards the state of the art projection models for calibration which were further interpreted in three representations, including the correspondence between rays and pixels, 3D physical points and pixels and between 3D physical points and 3D signal structure of the captured light field. Based on the analysis, parameters in the projection model were grouped into direction parameter set and depth parameter set. A two-step calibration method was then proposed with each step dealing with each set of parameters. The proposed method is able to reuse traditional camera calibration methods for the direction parameter set. A simply raw image-based calibration of depth parameter set was further proposed. Systematic validations were conducted to evaluate the performance of the proposed calibration method. Experimental results show that the accuracy and robustness of the proposed method outperforms its counterparts under various benchmark criteria.
