Abstract
This Letter reports a novel method to establish the metric relationship of depth value between object space and image space for unfocused plenoptic cameras. A three-dimensional (3D) measurement system was introduced to precisely construct benchmarks and matching features to compute the metric depths in the object space and the corresponding depth values in the image space for metric calibration. After metric calibration, precise measurement of the depth dimension was possible. Furthermore, with the aid of metric spatio-angular parameters determined via light field ray calibration, transverse dimensions were computed from the measured depth, realizing light field 3D measurement for unfocused plenoptic cameras. Finally, we experimentally performed accuracy analysis of the proposed method with depth measurement precision of 0.5mm in a depth range of 300mm, which illuminated potential applications of unfocused plenoptic cameras in the field of 3D measurement.
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