Image processing apparatus, flicker reduction method, imaging apparatus, and flicker reduction program

Abstract

An image processing apparatus includes: an integrating unit integrating an input image signal over a time interval equal to one horizontal period or longer; a normalizing unit normalizing an integrated value obtained by the integrating unit, or a difference value in the integrated value between adjacent fields or frames; an extracting unit extracting a spectrum of the normalized integrated value or difference value; an estimating unit estimating a flicker component on a field-by-field basis or frame-by-frame basis from the extracted spectrum; a detecting unit detecting a deviation of the latest flicker component, from the estimated latest flicker component and one or more flicker components estimated in the past; a correcting unit correcting the latest flicker component on the basis of the detected deviation of the flicker component; and a computing unit computing a corrected flicker component and the input image signal so as to cancel out the corrected flicker component.