Pupil segmentation in the light-field camera and its relation to 3D object positions and the reconstructed depth of field.
Pupil segmentation in the light-field camera and its relation to 3D object positions and the reconstructed depth of field.
复制标题
光场相机中的瞳孔分割及其与 3D 物体位置和重建景深的关系。
作者：
E. Serabyn
光场相机的光线跟踪模拟用于计算作为3D源位置的函数的点源响应。每个点源位置在小透镜阵列的焦平面中产生唯一且良好确定的分割光瞳图案，其中横向物体偏移改变图案的位置和对称性，并且散焦距离改变图案的直径。因此，分割的瞳孔图像可以用于推断点源的3D位置。数值模拟表明，分割的瞳孔图像的质心和宽度可以用来推断横向图像的位置的检测器像素的大小，和图像散焦的小透镜焦距的精度。在稀疏源情况下，例如，通过使用荧光显微镜或颗粒跟踪，因此可以从观察到的点源响应图案准确地确定3D点源位置。瞳孔分割的程度也直接限制了对光场图像进行重新聚焦的能力-对于足够大的图像散焦距离，瞳孔段的数量超过了单个小透镜后面的“整个”瞳孔内的像素数量，图像不再能够在数字上聚焦，从而定义了光场相机的景深。该约束意味着景深比通常的成像焦深大每个小透镜的检测器像素的数量的因子，这与一般预期一致。
A ray-trace simulation of the light-field camera is used to calculate point source responses as a function of 3D source positions. Each point source location yields a unique and well-determined segmented-pupil pattern in the lenslet array's focal plane, with lateral object offsets changing the pattern's location and symmetry, and defocus distances altering the pattern's diameter. Segmented-pupil images can thus be used to infer point sources' 3D locations. Numerical simulations show that the centroids and widths of segmented pupil images can be used to deduce lateral image positions to the size of a detector pixel, and image defocus to the accuracy of the lenslet focal length. In sparse-source cases, such as, e.g., fluorescence microscopy or particle tracking, 3D point-source locations can thus be accurately determined from the observed point source response patterns. The degree of pupil segmentation also directly constrains the ability to refocus light-field images-for image defocus distances large enough that the number of pupil segments exceeds the number of pixels within a "whole" pupil behind a single lenslet, the image can no longer be brought to focus numerically, thus defining the light-field camera's depth of field. This constraint implies a depth of field larger than the usual imaging depth of focus by a factor of the number of detector pixels per lenslet, consistent with the general expectation.
影响因子：
3.8
作者：
Cohen, Noy;Yang, Samuel;Levoy, Marc
通讯作者：
Levoy, Marc