An image-processor for shooting images at a high frame rate in time series maintaining a high sensitivity and a high speed is provided. The image-processor comprises a high-speed image-obtaining unit 1 for arranging the imaging elements in a one-dimensional or two-dimensional manner to obtain images at a high frame rate, a pixel selection unit 2 for selecting pixels constituting the image maintaining a predetermined sampling interval, and a peripheral pixel value addition unit 3 for a adding up pixel values of pixels selected by the pixel selection unit 2 and pixel values of peripheral pixeling. It comprises further a pixel value adjusting unit 4 for adjusting the pixel values of the sample pixels calculated by the peripheral pixel value addition unit 3 so as to be suited as pixel values of the output image, and an image output unit 5 for producing pixel values of sample pixels calculated by the pixel value adjusting unit 4 as an image of one frame.