Image processing method, image processing program and recording medium for recording the same program

Abstract

An image correction processing apparatus for correcting a pixel value of each pixel constituting image data obtained from an original image affected by the peripheral light-off is disclosed. The apparatus includes a pixel coordinate transforming unit (70) for converting a distance between each pixel of a group of pixels which have an equal amount of peripheral light amount reduction and which are located on a common contour line of an oval about a predetermined reference pixel located at the center thereof and said predetermined reference pixel into a radius of a true circle having a diameter corresponding to the major axis of the oval; a cos<4> calculating unit (71) for obtaining, for each pixel, an angle value thereof in proportion to the radius obtained by the conversion and then obtaining a cos<4> value of the angle value; and a correction calculating unit (72) for multiplying an inverse of said cos<4> value obtained for each pixel by a pixel value of this pixel, thereby to obtain a corrected pixel value for the pixel.

Description

technical field [0001] The present invention relates to, for example, reading an original image recorded on a negative film as digital image data, and performing a pixel value calculation of each pixel on the image data of the original image when exposing a printing paper in a digital exposure method. Revised image processing method. Background technique [0002] Previously, photographs were printed by irradiating light on a negative film on which the original image was recorded, and irradiating the light transmitted through the negative film onto the printing paper to realize the simulated exposure of printing. In addition, in recent years, red, blue, and green monochromatic lights have been converted into red, blue, and green monochromatic lights based on digital images obtained by scanning images on film and digital image data obtained by photographing digital cameras. The pixels are individually irradiated onto the printing paper to achieve the digital exposure of the p...

AI Technical Summary

Problems solved by technology

[0013] Therefore, in order to solve the above-mentioned problems, an object of the present invention is to provide an image processing that can reliably and efficiently correct the decrease in the light intensity of the surrounding area, that is, the occurrence of uneven light intensity in the surrounding area, on the original image. Method, image processing program, and recording medium for recording image processing program

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