A solid-state image sensor includes a pixel array including a plurality of pixel sub-arrays arranged in a main scanning direction, each of the pixel sub-arrays having a plurality of pixels two-dimensionally arranged to form a plurality of rows along the main scanning direction and a plurality of columns along the sub-scanning direction. The solid-state image sensor further includes control lines, signal lines, a pixel control circuit, and a read out circuit. The pixel control circuit applies a control signal to each pixel of each of the plurality of pixel sub-arrays through each of the plurality of signal lines, to cause each pixel to generate a pixel signal having a phase difference between the plurality of pixel sub-arrays. The readout circuit reads the pixel signal from each pixel of each of the plurality of pixel sub-arrays such that the pixel signal has a phase difference between the plurality of pixel sub-arrays.