1. An imaging apparatus comprising: a pixel section having a plurality of pixels arranged in two dimensions for effecting a photoelectric conversion; a light blocking section for blocking a light to conceal said pixel section in accordance with a light blocking instruction signal; a region setting section for outputting said light blocking instruction signal and setting a correcting pixel region from which pixel data for a correction are extracted within an effective pixel region of said pixel section where an object image is formed; a line memory for retaining pixel data from said correcting pixel region at the time of blocking light; and a correcting section for correcting an output of pixel data from said pixel section using the pixel data retained at said line memory.