Image processing apparatus, method of controlling image processing apparatus, and storage medium

A method of controlling an image processing apparatus comprising the steps of:

• obtaining a plurality of inputted images that are contiguously captured;
• performing determination of a first region based on the obtained inputted images, the first region being formed from pixels each having a change in pixel value below a predetermined threshold in a predetermined period, the determination being performed in each of a plurality of the continuous predetermined periods;
• performing determination of a second region based on a plurality of the first regions determined in the plurality of the continuous predetermined periods, respectively;
• performing determination of a third region by subjecting image data representing the determined second region to image processing;
• and
• updating a background image based on the obtained inputted images and any of the determined third region.

A non-transitory computer readable storage medium storing a program which causes a computer to perform the steps of:

• obtaining a plurality of inputted images that are contiguously captured;
• performing determination of a first region based on the obtained inputted images, the first region being formed from pixels each having a change in pixel value below a predetermined threshold in a predetermined period, the determination being performed in each of a plurality of the continuous predetermined periods;
• performing determination of a second region based on a plurality of the first regions determined in the plurality of the continuous predetermined periods, respectively;
• performing determination of a third region by subjecting image data representing the determined second region to image processing;
• and
• updating a background image based on the obtained inputted images and any of the determined third region.