Radiation imaging apparatus, image processing apparatus, and image processing method

A radiation imaging apparatus comprising:

• an imaging sensor having a plurality of pixels arranged in a matrix pattern, the pixels including a first pixel group for obtaining a pixel value corresponding to a radiation dose and a second pixel group for obtaining an offset value even with irradiation with radiation;
• and
• an image processing apparatus configured to process an image obtained from the imaging sensor,
• wherein the image processing apparatus includes
• a first correction unit configured to perform offset correction of a radiation image obtained from the plurality of pixels by an imaging operation with irradiation with radiation based on a dark image obtained from the plurality of pixels by an imaging operation without irradiation with radiation,
• a calculation unit configured to calculate a statistic value of pixel values obtained from the second pixel group of the radiation image corrected by the first correction unit, and
• a second correction unit configured to correct pixel values obtained from the first pixel group, which are corrected by the first correction unit, based on a temporal variation in the statistic value obtained by the calculation unit.

An image processing method for processing an image obtained from an imaging sensor having a plurality of pixels arranged in a matrix pattern, the pixels including a first pixel group for obtaining a pixel value corresponding to a radiation dose and a second pixel group for obtaining an offset value even with irradiation with radiation, the method comprising:

• executing first correction processing of performing offset correction of a radiation image obtained from the plurality of pixels by an imaging operation with irradiation with radiation by using an offset image based on a dark image obtained from the plurality of pixels by an imaging operation without irradiation with radiation;
• calculating a statistic value of pixel values obtained from the second pixel group of the radiation image corrected by the first correction processing;
• and
• executing second correction processing of correcting pixel values obtained from the first pixel group, corrected by the first correction, based on a temporal variation in the statistic value.