Image sensor having output of integral image

An image sensor having an output of an integral image is provided. The image sensor includes a pixel circuit, a line accumulator, and a volume accumulator. The pixel circuit includes a plurality of pixels for capturing pixel values of the pixels. The line accumulator is used for accumulating the pixel values of the pixels from a first pixel to a target pixel in a target pixel line of the image so as to obtain an accumulated line pixel value. The volume accumulator is used for adding the accumulated line pixel value output by the line accumulator to an integral pixel value of the pixel corresponding to the target pixel in a previous pixel line of the target pixel line, and using an adding result as the integral pixel value of the target pixel, so as to output the integral pixel value of the target pixel to form an integral image.