APPARATUS AND METHOD FOR CORRECTING A LOW TONE WITH NON-LINEAR MAPPING AND COMPUTER READABLE MEDIUM STORED THEREON COMPUTER EXECUTABLE INSTRUCTION RECORDED WITH TIME-SERIES DATA STRUCTURE

摘要

An apparatus and a method for correcting a low tone with non-linear mapping and a computer readable medium recording a program of the method are provided to process a low tone area by harmonizing brightness to be equal or similar to an image information value of a bright image, thereby removing error with regard to color information. An apparatus(100) corrects a low tone area of an input image. A brightness calculation unit(130) calculates a brightness value of each pixel by using image information of each pixel of a target image to be converted. A calculation unit(135) calculates a light adjustment value per each pixel by using the image information and brightness value of each pixel. The light adjustment value indicates response degree with regard to brightness degree of an image based on image information of each pixel. A converting unit(170) converts the image information of each pixel by using a ratio of the image information to the light adjustment value.