US 11,747,517 B2
Sky monitoring system
Yujie Wu, Ecublens (CH); Jérôme Henri Kämpf, Corcelles-Près-Concise (CH); and Jean-Louis Scartezzini, Lausanne (CH)
Assigned to ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL), Lausanne (CH)
Appl. No. 16/636,671
Filed by Ecole Polytechnique Federale De Lausanne (EPFL), Lausanne (CH)
PCT Filed Aug. 5, 2018, PCT No. PCT/IB2018/055889
§ 371(c)(1), (2) Date Feb. 5, 2020,
PCT Pub. No. WO2019/030639, PCT Pub. Date Feb. 14, 2019.
Claims priority of application No. 10 2017 007 333.3 (DE), filed on Aug. 5, 2017.
Prior Publication US 2021/0149080 A1, May 20, 2021
Int. Cl. G01W 1/12 (2006.01); H04N 13/239 (2018.01); G03B 17/56 (2021.01); H04N 23/698 (2023.01); H04N 25/772 (2023.01)
CPC G01W 1/12 (2013.01) [G03B 17/565 (2013.01); H04N 13/239 (2018.05); H04N 23/698 (2023.01); H04N 25/772 (2023.01)] 20 Claims
OG exemplary drawing
 
1. A sky monitoring system, comprising:
an image sensor,
a wide-angle lens positioned relative to the image sensor to direct light thereto,
a microprocessor communicatively coupled to the image sensor, and
a memory unit communicatively coupled to the microprocessor,
wherein the image sensor, the wide-angle lens, the microprocessor, and the memory unit are integrated into one single sky monitoring device, and wherein a spectral response of the image sensor is corrected according to a CIE photopic luminosity function V(λ),
wherein the microprocessor, using the memory unit, is configured to:
capture a plurality of pictures of a sky scene;
subdivide each of the plurality of pictures of the sky scene into a group of patches, wherein each patch corresponds to a unique incident angle of observed light rays from the sky;
determine a luminance value for each of the patches;
calculate an output based on the luminance values of the patches; and
supply as the output an illuminance map of a surface inside a building.