US 12,422,335 B2
Calibration of a light-field generation device
Christian Kludt, Karlsruhe (DE); and Marcos López Martinez, Karlsruhe (DE)
Assigned to Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V., Munich (DE)
Appl. No. 18/250,381
Filed by FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V., Munich (DE)
PCT Filed Oct. 26, 2021, PCT No. PCT/EP2021/079614
§ 371(c)(1), (2) Date Apr. 25, 2023,
PCT Pub. No. WO2022/090193, PCT Pub. Date May 5, 2022.
Claims priority of application No. 10 2020 128 141.2 (DE), filed on Oct. 26, 2020.
Prior Publication US 2023/0417629 A1, Dec. 28, 2023
Int. Cl. G01M 11/06 (2006.01); G01M 11/02 (2006.01)
CPC G01M 11/065 (2013.01) [G01M 11/0264 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for calibrating a light field generating device, which has a display unit with pixels for generating light and a lens field unit with optical lenses for deflecting the light generated by the display unit, and a control unit for controlling the display unit, each lens of the lens field unit being assigned a plurality of pixels of the display unit, the method having the following steps:
a) generating light through one or more pixels of the display unit according to a predetermined calibration pattern;
b) detecting the light generated according to the calibration pattern by a measuring unit of a calibration device which is arranged in a predetermined spatial relation to the light field generating device;
c) respectively calculating a deflection angle of the lens field unit for the pixel or pixels which have generated light according to the calibration pattern, on the basis of the detected light by a calculation unit of the calibration device in dependence on the predetermined calibration pattern and the predetermined spatial relation; and
d) calibrating the light field generating device by utilizing at least one calculated deflection angle and a predetermined calculation model of the light field generating device with an assignment of respective deflection angles of the lens field unit to at least a majority of the pixels of the display unit in the control unit of the light field generating device,
wherein a number of optical lenses of the lens field unit and/or a description of a geometrical arrangement of the optical lenses of the lens field unit and/or one or more properties of respective optical lenses of the lens field unit is/are quantified by the predetermined calculation model.