IMAGE PROCESSING DEVICE, IMAGE PROCESSING METHOD, IMAGE PROCESSING PROGRAM, AND INFORMATION STORAGE MEDIUM STORING IMAGE PROCESSING PROGRAM

摘要

The value of a first leakage current outputted from each signal line is stored in a storage unit in the state where a radiation is equally applied to a radiation image detector and the charge in accordance with the amount of the applied radiation is held. The value of a second leakage current outputted from each signal line is acquired in the state where a radiation having transmitted through a subject is applied to the radiation image detector and the charge in accordance with the amount of the applied radiation is held in the radiation image detector. If the first and second leakage current values are equal for each line corresponding to each signal line, all pixels on the lines are judged to be background areas (lines A, C). If the second leakage current value is smaller than the first leakage current value and larger than a predetermined value, it is judged that the subject areas and the background areas are mixed on the lines (lines B, D, E) and the total number of pixels of the background areas on the lines can be obtained from the ratio of the first leakage current value to the second leakage current value. The way that a subject area and a background area in the image in which the radiation having transmitted through the subject is applied to the radiation image detector and held therein are distributed is estimated before the completion of the reading of the image.