Solid-state imaging device

A solid-state image pickup device comprising:

• a plurality of optoelectronic conversion units having different sizes;
• a first optical signal accumulation unit configured to perform an optoelectronic conversion in a first period by the optoelectronic conversion units and accumulate a first optical signal;
• a first reference potential accumulation unit configured to accumulate a first reference potential corresponding to the first optical signal;
• a second optical signal accumulation unit configured to perform an optoelectronic conversion in a second period by the optoelectronic conversion units and accumulate a second optical signal, the second period being shorter than the first period;
• and
• a combining unit configured to perform a Correlated Double Sampling (CDS) process, the combining unit comprising:
• a counter configured to:
• count in a downward direction to acquire a first value corresponding to the first reference potential,
• after acquiring the first value, count in an upward direction to acquire a second value corresponding to the first optical signal in the first period,
• based on the second value being equal to or greater than a predetermine value, count in the downward direction to acquire a third value corresponding to the first reference potential, and
• after acquiring the third value, count in the upward direction to acquire a fourth value corresponding to the second optical signal in the second period,
• and store the fourth value as the CDS processed optical signal.