Solid-state imaging device and recognition system having multiple pixels stacked in the vertical direction

A recognition system, comprising:

• a solid-state imaging device, comprising:
• a plurality of unit pixels arranged in a matrix in a pixel array;
• a signal processing circuit that reads out a signal from each of the unit pixels of the plurality of unit pixels,
• wherein each of the unit pixels includes:
• a first pixel that is disposed on a first surface and that detects light of a first wavelength band;
• and
• a second pixel that is disposed on a second surface parallel to the first surface and that detects light of a second wavelength band different from the first wavelength band, and
• wherein the signal processing circuit includes a first conversion circuit that is connected to the first pixel and the second pixel in each of the unit pixels and that converts an analog signal output from each of the first pixel and the second pixel into a digital signal;
• a first drive circuit that drives the first pixel in each of the unit pixels;
• and
• a second drive circuit that drives the second pixel in each of the unit pixels,
• wherein the first drive circuit and the second drive circuit are provided on opposite sides of the pixel array;
• and
• a recognition processing section that executes recognition processing based on first detection data acquired in the first pixel and second detection data acquired in the second pixel, in the solid-state imaging device.