Patent ID: 8780389

Claim:
An image processing device comprising: a detecting unit configured to detect a command; an image-processing circuit; a heater; a plurality of processors including a first processor and a second processor having a lower processing capacity than the first processor, the first processor having a halted state and an active state, the first processor not being driven in the halted state and being driven in the active state; and memory storing instructions that, when executed, cause the image processing device to: determine whether or not the command indicates that a process is to be executed by the first processor; determine whether or not a processor load, of the second processor, required for the process is larger than a prescribed threshold processor load; if the command does not indicate that the process is to be executed by the first processor: if the processor load of the second processor required for the process is larger than the prescribed threshold processor load, activate a first power state, in which the first processor is activated to the active state, and execute the process using the first processor without using the second processor while the second processor is active; if the processor load of the second processor required for the process is not larger than the prescribed threshold processor load, execute the process using the second processor in a second power state, wherein the image-processing circuit and the heater are both powered off in the second power state; if the command indicates that the process is to be executed by the first processor: activate a third power state, in which the image-processing circuit and the second processor are driven and the heater is powered off; upon receipt of an instruction to initiate image formation, activate a fourth power state in which the heater and the image-processing circuit are both driven; and if the image processing device has not received an instructions to initiate image formation for a predefined amount of time since switching to the third power state, switch from the third power state to the second power state.