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 |
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.
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