Patent ID: 11917290
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. An image pickup apparatus comprising:
a photoelectric conversion device having a pixel including a photoelectric conversion element that outputs a signal according to an incident photon, a photon counter that measures the number of photons incident to the pixel, a time counter that measures a time until the photo counter reaches a first threshold after the photo counter starts measurement and outputs the measured time as a pixel value,
at least one processor or circuit configured to function as:
a first threshold changing unit configured to change the first threshold; and
a voltage measuring unit configured to detect a voltage of a power supply for driving the photoelectric conversion device,
wherein if the voltage of the power supply is lower than a predetermined threshold, the first threshold is set lower compared to a case in which the voltage of the power supply is equal to or higher than the predetermined threshold.