In this paper, a computational photography system is utilized to sample 4D light fields. The system is implemented using a normal DSLR camera with a mask printed using Kodak LVT technique. We reconfigure the camera by inserting a pinhole array mask in front of the sensors. The mask blocks part of light and samples the rest that passes through the pinholes. With these 4D light field data, the refocused images are obtained by rearranging the captured sub-images. The range of refocusing is also studied to avoid diffraction blurring effect in the refocused images.
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Chen et al. (2010) studied this question.
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