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Computational reconstruction for three-dimensional imaging via a diffraction grating
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DOI：10.1364/OE.27.027820.png)
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摘要
En 中文
This paper describes a computational reconstruction method for 3-D imaging via a diffraction grating. An optical device consisting of a diffraction grating with a camera produces a parallax image array (PIA) for 3-D imaging in an efficient way according to recent researches. Unlike other capturing systems for a PIA such as a lens array with a camera and a camera array, a diffraction grating with a camera has an advantage in terms of the optical system complexity. However, since the diffraction grating is transparent, the captured raw image by the diffraction grating has no feature to detect the boundary of each parallax image. Moreover, the diffraction grating allows parallax images to overlap each other due to its optical property. Those problems prevent computational reconstruction from generating 3-D images. To remedy those problems, we propose a 3-D computational reconstruction method via a diffraction grating. The proposed method using a diffraction grating includes analyzing the PIA pickup process and converting a captured raw image into a well-defined PIA. Our analysis introduces a virtual pinhole; thus, a diffraction grating works as a camera array. Also, it defines the effective object area to segment parallax images and provides a mapping between each segmented parallax image and corresponding virtual pinhole. The minimum image area is also defined to determine the minimum field of view for our reconstruction. Optical experimental results indicated the proposed theoretical analysis and computational reconstruction in diffraction grating imaging are feasible in 3-D imaging. To our best knowledge, this is the first report on 3-D computational reconstruction via a diffraction grating. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keyword:
LENSLET ARRAY
IMAGES
PARALLAX
DISPLAY
ENHANCEMENT
CONVOLUTION
EXTRACTION
GENERATION
PROPERTY
LATTICE
