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Plenoptic imaging device

a technology of optical imaging and optical image, applied in the field of optical imaging devices, can solve the problems of limited utility, inability to perform inversion steps, inferior throughput, etc., and achieve the effects of simple optical design, high spatial resolution, and multiplicating optical images

Inactive Publication Date: 2018-07-19
UNIV DES SAARLANDES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a simple optical device that can be added to existing cameras to capture multiple plenoptic dimensions, such as wavelength, time, and direction. It uses inter-reflections within mirror systems to achieve high dynamic range, multispectral, and polarization imaging. Compared to other light-field cameras, the invention explores an orthogonal end of the design space, with a high spatial resolution and a low number of angular views. It also allows for regulation of the depth of field and control of light field aliasing. Overall, the invention provides a flexible and efficient way to capture plenoptic imaging with any standard camera.

Problems solved by technology

Optical flow [Horn and Schunck 1981] can be applied, but in practice, it is of limited utility since it is based on the brightness constancy assumption which may be violated when different optical pre-filters are being used.
Often, this inversion step is ill-posed and has to be regularized using prior information about the signal.
2008], even though the latter leads to a lower SNR because the light throughput is inferior.

Method used

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first embodiment

[0033]FIG. 1 shows a schematic overview of a plenoptic imaging device according to the invention.

[0034]The original image of the standard camera lens 110 is projected on a diffuser screen 120 that is placed in the location that would usually be occupied by the cameras sensor. This diffuser 120 is observed through an image multiplier 130, e.g. a mirror arrangement, which produces a number of copies of the original image that still carry the physical information of the plenoptic function, except for directional light variation. A pick-up imaging system 140 projects the information exiting the mirror system on a filter plane 150. This projected image on the filter plane 150 has the dimensions of the original sensor, but contains spatially separated copies of the original image. These copies can be individually modulated by optical filters placed in the filter plane, hereby, enabling, among others, snapshot high dynamic range, multispectral, and polarization imaging. It would be possibl...

second embodiment

[0050]FIG. 3 shows a design for an imaging device according to the invention that can be used for light-field imaging. Here, the filter plane and the 1:1 imaging system of the filter-based design are omitted and the output of the pickup system is imaged directly onto the sensor. The light-field imaging effect is based on a subsampling of the main lens aperture [Ng et al. 2005].

[0051]By omitting the diffuser component, one preserves the directionality of the plenoptic function on the entrance plane and can sample it in the sub-images. A difficulty is the divergent nature of the image cast by the main lens onto the entrance plane, see FIG. 4 (a). For clarity, a pinhole-like aperture of the pickup system is shown, including two scene points that are imaged from three directions each. One sees that vignetting occurs; the blue view is completely blocked for the upper scene point whereas the green view is missing for the lower scene point. The problem comes from the mismatch between the e...

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PUM

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Abstract

A plenoptic imaging device includes an image multiplier for obtaining a multitude of optical images of an object or scene; and a diffuser screen. The image multiplier may be a kaleidoscope. The device may include an array of optical filters for filtering the multitude of optical images.

Description

RELATED APPLICATION[0001]This application is a continuation of U.S. patent application Ser. No. 14 / 765,572; filed Aug. 4, 2015 and titled “Plenoptic Imaging Device,” which is a National Stage Entry of PCT / EP2014 / 052747, filed Feb. 12, 2014, which claims priority from U.S. provisional application No. 61 / 764,084, filed Feb. 13, 2013 and from European patent application No. 13155094.9, filed Feb. 13, 2013, the entire contents of each of which are hereby fully incorporated herein by reference for all purposes.[0002]The present invention relates to a non-permanent, reconfigurable camera add-on for high dynamic range, multispectral, polarization, and light-field imaging.TECHNICAL BACKGROUND[0003]Imaging dimensions of the plenoptic function has been a long-standing goal [Adelson and Bergen 1991]. Access to the full properties of the incident light on a sensor, e.g. the direction, spectrum, the temporal variation, the polarization and other properties has a large number of applications in s...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/225G02B5/04G02B5/02G02B5/20G02B27/08
CPCG02B5/0273G02B5/04G02B27/08H04N2213/001H04N13/214H04N5/2254H04N13/218H04N13/257G02B5/201G02B27/0075H04N23/55
Inventor KLEHM, OLIVERIHRKE, IVORESTREPO, JOHNMANAKOV, ALKHAZURHEGEDUS, RAMON
Owner UNIV DES SAARLANDES
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