Patent ID: 6546197
Filing Date: 2003-04-08
Classification: H04N

Abstract:
A method of correcting image data picked up from a frame photographed on a photo filmstrip through a taking lens, wherein said photo filmstrip is curved along a direction to be concave on the side of said taking lens with a center point of said frame located on an optical axis of said taking lens in a focal plane of said taking lens when said frame is photographed, said method comprising the steps of:determining a first kind of correction amount for each pixel of said picture, to compensate for decrease in exposure amount that results from decrease in illuminance in a focal plane of said taking lens with radial distance from an optical axis of said taking lens, provided that said photo filmstrip is held flat in said focal plane when said frame is photographed: determining a second kind of correction amount for each pixel of said picture on the basis of increase in illuminance in those portions of said frame which are shifted from said focal plane toward said taking lens as a result of the curvature of said photo filmstrip behind said taking lens; and correcting image data of each pixel in accordance with an exposure correction amount obtained from said first and second kinds of correction amounts.