An image correction processor and an image correction processing method that ensure proper interpolation processing of defective pixels even in the event that grids are arranged for imaging such that a sequence of defective pixel groups of a radiographic image detector is in parallel with the grid direction of scattered radiation removal grids. The image correction processor is provided with a line defect detection section (52) to detect a line defect pixel group, a frequency band division section (53) to divide the line defect pixel group and image signal around a region thereof into a low-frequency band and a high-frequency band, an interpolation processing section (54) that performs the arbitrary interpolation using pixel values of neighboring pixels for the pixel values of line defect pixels for the low-frequency band image signal and performs the interpolation using the predefined interpolation functions for the high-frequency band image signal, and a frequency band synthesizing section (55) that synthesizes the low-frequency band image signal and the high-frequency band image signal after interpolation to reconstruct the original image signal.
