Abstract. Three-dimensional light field imaging in laparoscopic surgery is an emerging technology, which has the potential to enable three-dimensional imaging. Calibration of the three-dimensional light field endoscope (3D LFE) is essential but challenging as the disparity is much smaller than that of the conventional light field camera. The geometrical model for 3D LFE is established, and a calibration method based on virtual objective lens and virtual feature points is proposed. First, the virtual objective lens is introduced and the parameters about it are calibrated using corner features in center subaperture images. Second, two types of virtual feature points are proposed to calibrate the parameters about the microlens array, one is on the black-and-white board line and the other is selectively determined but can be anywhere on the checkerboard. Moreover, the relationship between the virtual feature points mapping in the microlens image and the virtual feature points mapping in the central subaperture image is deduced to overcome tiny light field disparity. Experimental results verify the performance of our calibration method.

中文翻译：

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基于虚拟物镜和虚拟特征点的光场内窥镜标定

摘要。腹腔镜手术中的三维光场成像是一项新兴技术，具有实现三维成像的潜力。三维光场内窥镜 (3D LFE) 的校准是必不可少的，但由于其差异远小于传统光场相机的差异，因此具有挑战性。建立了3D LFE的几何模型，提出了一种基于虚拟物镜和虚拟特征点的标定方法。首先，引入虚拟物镜，利用中心子孔径图像中的角点特征对其参数进行标定。其次，提出了两种类型的虚拟特征点来校准微透镜阵列的参数，一个在黑白棋盘线上，另一个是选择性确定的，但可以在棋盘上的任何位置。此外，推导出微透镜图像中的虚拟特征点映射与中央子孔径图像中的虚拟特征点映射之间的关系，以克服微小的光场差异。实验结果验证了我们的校准方法的性能。