According to the present invention, an imaging unit, comprising an imaging device, an imaging device driver, and a signal-processing block, is provided. The imaging device has pixels which are arranged in a first direction. The pixels are alternately and repeatedly covered with N1 kinds of different color filters along the first direction. The imaging device driver drives the imaging device. N1*N2 pixels successively arranged in the first direction are defined as a pixel block. The imaging device driver orders the N1 pixels covered with the different color filters in the pixel block to output pixel signals when a first output method with thinning out is carried out. The signal-processing block averages the pixel signals output from a plurality of the pixel blocks for every color of the color filter