3 May 2012 A split-sensor light field camera for extended depth of field and superresolution
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Abstract
It has been shown that the original light field camera behaves the opposite of a conventional one: Image blur decays away from a certain plane in space, a property that is called inverted depth of field.1 Moreover, the blur at such out of focus plane is bounded from above. This property allows the light field camera to exceed the depth of field of conventional imaging systems as well as that of other computational devices. In this paper, we propose a novel design to further improve the light field camera. The proposed system can drastically reduce the loss in resolution at the out of focus plane while retaining the advantages of the original camera design. We introduce a beam splitter (prism or glass) to provide the same field of view on two halves of the sensor. We also split a microlens array in two halves matching the sensor partition. The focal length of the microlenses in one half can be different from those of the other half. In the geometric optics approximation this architecture ensures that each half of the sensor can measure light ray samples with different (and partially complementary) aliasing properties.
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Paolo Favaro, Paolo Favaro, } "A split-sensor light field camera for extended depth of field and superresolution", Proc. SPIE 8436, Optics, Photonics, and Digital Technologies for Multimedia Applications II, 843602 (3 May 2012); doi: 10.1117/12.924927; https://doi.org/10.1117/12.924927
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