Photoelectric conversion device, apparatus, and signal processing method

A photoelectric conversion device comprising:

• a pixel array including at least one pixel region for which a common exposure time is set, the at least one pixel region including a plurality of counting pixels each configured to output a pixel signal corresponding to a counted value of a number of photons incident during a given exposure time;
• and
• a control unit configured to control the common exposure time of the pixel array,
• wherein the at least one pixel region includes at least one detection unit configured to detect an event indicating a change in the pixel signals, and a selection unit configured to select one of the plurality of counting pixels included in the at least one pixel region as at least one first counting pixel connected to the at least one detection unit,
• wherein, in a case where the event is detected, the control unit determines a length of the common exposure time of the at least one pixel region,
• wherein the at least one pixel region further includes a setting unit configured to set a condition under which imaging is performed by the photoelectric conversion device,
• wherein the control unit determines the length of the common exposure time of the at least one pixel region based on the event and the condition, and
• wherein the setting unit derives, as the condition, an optical flow in the at least one pixel region based on the event.