Radiation imaging apparatus, control method therefor, radiation imaging system, and storage medium

A control method for a radiation imaging apparatus configured to perform radiation imaging of a subject, the radiation imaging apparatus including an image generation unit configured to generate a radiation image based on an incident radiation, the control method comprising:

• in a case where it is determined, based on a camera image captured by a camera and output data output from a detection sensor configured to detect at least either one of a position or a movement, that at least any one of conditions including a positional relation between the radiation imaging apparatus and a radiation generation apparatus configured to generate the radiation, a positional relation between the subject and the radiation imaging apparatus, or a posture of the subject becomes a predetermined state in the radiation imaging, performing control so that a transition is made from a wait state in which a lower power consumption is provided than in an imaging-ready state in which the radiation is detectable by the image generation unit, to the imaging-ready state.