| CPC H04N 23/76 (2023.01) [H04N 23/71 (2023.01); H04N 23/73 (2023.01)] | 10 Claims |
|
1. An image capture apparatus, comprising:
at least one processor that, in operation, performs:
a first brightness adjustment that adjusts brightness during capture of an image of an object;
a second brightness adjustment that adjusts brightness of an analog image signal of the object captured with the brightness adjusted by the first brightness adjustment;
an analog/digital (A/D) conversion on the analog image signal having the brightness adjusted by the second brightness adjustment;
a third brightness adjustment that adjusts brightness of a digital image signal on which the A/D conversion has been performed; and
a gain-up adjustment that increases, by real-time change adjustment using a gamma characteristic, a digital gain for a low illuminance portion of the digital image signal for which the brightness has been adjusted by the third brightness adjustment,
wherein:
the first brightness adjustment is an exposure time adjustment that adjusts exposure time,
the second brightness adjustment is an analog gain adjustment that adjusts an output amplitude of the analog image signal,
the third brightness adjustment is a digital gain adjustment that adjusts an output amplitude of the digital image signal, and
when the first brightness adjustment, the second brightness adjustment, or the third brightness adjustment is performed, the at least one processor sets a brightness point at which a gain coefficient α starts to change by adjusting a value of the digital gain from a maximum value to any reduced value in order to adjust a brightness level at which the real-time change adjustment using the gamma characteristic with respect to brightness of the object is started.
|