Image processing apparatus for performing noise reduction processing

An image processing apparatus comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor, the memory having instructions that, when executed by the at least one processor, cause the at least one processor to function as:
• an obtaining unit configured to obtain a first radiation image of an inspection target object that has been captured by a radiation imaging apparatus;
• and
• a generation unit configured to generate a second radiation image including noise reduced as compared with the first radiation image, by inputting the first radiation image obtained by the obtaining unit to a learned model obtained by performing learning using learning data including a radiation image to which noise simulating system noise of the radiation imaging apparatus and noise simulating a quantum noise included in radiation that have been obtained by using a distribution that is based on a manufacturing variation among radiation imaging apparatuses are added,
• wherein the noise simulating system noise is obtained by using a distribution indicating a variation among a plurality of system noise characteristics, that is generated by the manufacturing variation among the radiation imaging apparatuses, and being obtained by using an average and a variance of the plurality of system noise characteristics.