Image processing apparatus, control method for image processing apparatus, program, and image forming apparatus

An image processing apparatus in which a power state is switchable between a first power state and a second power state where a power consumption is lower than in the first power state, the image processing apparatus comprising:

• a detection unit configured to detect a presence of an object for a single area or multiple areas individually and obtain a location of each of the areas where the object is detected as detection location information;
• a registration unit configured to register a piece or multiple pieces of detection pattern information that can identify a piece or multiple pieces of detection location information and a detection order thereof;
• and
• a control unit configured to perform control such that a return process for switching the power state from the second power state to the first power state is started when the detection location information sequentially detected by the detection unit is matched with a detection-order leading part of any of the detection pattern information registered in the registration unit, the return process is continued while the detection pattern information is matched, and the return process is not continued when the detection pattern information is not matched.