Image processing apparatus, radiation imaging apparatus, image processing method, and storage medium

A radiation imaging apparatus comprising:

• a radiation generator configured to generate radiation;
• a detection unit configured to detect the radiation;
• and
• an image processing apparatus configured to process image data detected by the detection unit,
• the image processing apparatus comprising:
• a first correction unit configured to perform correction processing of subtracting a first dark image obtained in a state without radiation irradiation from an object image, thereby removing a dark component of the object image;
• an evaluation value obtaining unit configured to obtain an evaluation value by a varying dark component included in a corrected image that has undergone the correction processing based on the first dark image and a second dark image obtained after the first dark image;
• and
• a second correction unit configured to perform correction processing of removing the varying dark component from the corrected image based on the evaluation value.

An image processing method comprising:

• performing correction processing of subtracting a first dark image obtained in a state without radiation irradiation from an object image, thereby removing a dark component of the object image;
• obtaining an evaluation value by a varying dark component included in a corrected image that has undergone the correction processing based on the first dark image and a second dark image obtained after the first dark image;
• and
• performing correction processing of removing the varying dark component from the corrected image based on the evaluation value.

A computer-readable storage medium storing a program that causes a computer to function as each unit of an image processing apparatus, the image processing apparatus comprising:

• a first correction unit configured to perform correction processing of subtracting a first dark image obtained in a state without radiation irradiation from an object image, thereby removing a dark component of the object image;
• an evaluation value obtaining unit configured to obtain an evaluation value by a varying dark component included in a corrected image that has undergone the correction processing based on the first dark image and a second dark image obtained after the first dark image;
• and
• a second correction unit configured to perform correction processing of removing the varying dark component from the corrected image based on the evaluation value.