Patent ID: 8805072
Filing Date: 2014-08-12
Classification: G06T

Abstract:
1. An image processing device comprising: a creating unit configured to create a gray level histogram from a gray level value of each pixel in a multi-level image; an average gray level value calculation unit configured to calculate an average gray level value of each pixel in the multi-level image; a parameter calculation unit configured to calculate a gray level conversion parameter for converting the average gray level value which is calculated in the average gray level value calculation unit to a gray level median value of each of the pixels; a correction unit configured to correct the gray level values of the gray level histogram on the basis of the a gray level conversion parameter which is calculated in the parameter calculation unit; a selection unit configured to select a temporary threshold value from the gray level histogram of which the gray level values are corrected in the correction unit; a determination unit configured to determine a threshold value for binarizing each of the pixels by performing an inverse correction with respect to the temporary threshold value which is selected in the selection unit on the basis of the gray level conversion parameter obtained in the parameter calculation unit; and a binarizing unit configured to binarize the multi-level image using the threshold value which is determined in the determination unit.