CPC H04N 23/661 (2023.01) [G06T 7/90 (2017.01); H04N 23/56 (2023.01); H04N 23/84 (2023.01); H04N 23/88 (2023.01); G06T 2207/10024 (2013.01); G06T 2207/10048 (2013.01)] | 11 Claims |
1. An imaging device having a lens and an image sensor, the imaging device comprising:
an infrared cut filter that is inserted on or removed from an imaging optical path of the lens;
a visible light sensor that measures an amount of visible light components based on information acquired from the image sensor;
an infrared illumination apparatus that irradiates infrared light, wherein the intensity of the infrared illumination by the infrared illumination apparatus is corrected according to characteristics of reflected infrared light;
at least one processor; and
a memory coupled to the at least one processor, the memory storing instructions that, when executed by the at least one processor, cause the at least one processor to cause an intensity of the infrared illumination by the infrared illumination apparatus to gradually change as the amount of visible light components measured by the visible light sensor decreases from a first threshold to a second threshold,
wherein, if the amount of visible light components is less than or equal to the first threshold, the infrared cut filter is removed from the imaging optical path,
wherein the instructions further cause the at least one processor to:
calculate a chrominance component from an image acquired from the image sensor;
calculate a first chrominance component from the image with the infrared cut filter inserted on the imaging optical path;
calculate a second chrominance component from the image with the infrared cut filter removed from the imaging optical path;
wherein, if the second chrominance component is less than or equal to a third threshold that is greater than a fourth threshold and if the first chrominance component and the second chrominance component are equal to or greater than the fourth threshold, the instructions further cause the at least one processor to cause the intensity of the infrared illumination by the infrared illumination apparatus to decrease as the amount of visible light components decreases.
|