Imaging device

An imaging device comprising:

• pixels each of which includes a charge accumulation region and a readout circuit and accumulates charge depending on an amount of exposure;
• a first frame memory;
• a second frame memory;
• an image processing circuit;
• and
• a first light source that emits infrared light having a peak at a first wavelength,
• wherein the first frame memory temporarily stores a first digital signal corresponding to a first analog signal read out through the readout circuit,
• the second frame memory temporarily stores a second digital signal corresponding to a second analog signal depending on an amount of charge accumulated in each of the pixels during a first exposure period following a reading period in which the first analog signal is read out,
• the image processing circuit outputs a difference between a first difference and a second difference, the first difference being a difference between a third digital signal and the second digital signal, the third digital signal corresponding to a third analog signal corresponding to an amount of charge cumulatively accumulated in each of the pixels during the first exposure period and a second exposure period following the first exposure period, the second difference being a difference between the second digital signal and the first digital signal, and
• at least one of the first exposure period or the second exposure period includes a period in which the first light source is in an on-state.