17 February 2010 Integral imaging using pupil modulation and depth-control processing
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Integral imaging system uses a lens array to capture an object and display a three-dimensional (3-D) image of that object. In principle, a 3-D image is generated at the depth position of the object, but for an object located away from the lens array in the depth direction, the modulation transfer function (MTF) of the integral imaging system will be degraded. In this paper, we propose a method that uses pupil modulation and depth-control processing to alleviate this degraded MTF. First, to alleviate changes in the MTF due to differences in depth when capturing the object, we use a pupil-modulated elemental lens to obtain an elemental image. Next, we use a filter having characteristics opposite those of the MTF characteristics of the pupil-modulated elemental lens to restore the degraded image. Finally, we apply depth-control processing to the restored elemental image to generate a reconstructed image near the lens array. This method can alleviate degradation in the MTF of the integral imaging system when an object is located at a distance from the lens array. We also show results of computer simulations that demonstrated the effectiveness of the proposed method.
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Jun Arai, Jun Arai, Masahiro Kawakita, Masahiro Kawakita, Makoto Okui, Makoto Okui, Eisuke Nakasu, Eisuke Nakasu, Fumio Okano, Fumio Okano, "Integral imaging using pupil modulation and depth-control processing", Proc. SPIE 7524, Stereoscopic Displays and Applications XXI, 75241Q (17 February 2010); doi: 10.1117/12.839113; https://doi.org/10.1117/12.839113

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