Patent ID: 6580460
Filing Date: 2003-06-17
Classification: H04N

Abstract:
An image input/output system built by connecting an image output device and an image input device, said image output device outputting an image signal received from said image input device, and supplying electric power to said image input device,said image input device being connected to said image output device via a connection cable to transmit image data to said image output device and to receive the electric power supplied from said image output device, said image input device comprising: a power supply unit; and a power supply control unit (i) for determining whether to receive the electric power from said image output device, (ii) for, when it is determined that said image input device can receive the electric power from said image output device, using the electric power from said image output device, and (iii) for, when it is determined that said image input device cannot receive the electric power from said image output device, using electric power from said power supply unit, wherein said image input device further comprises means for, when said image input device can receive the electric power from said image output device, measuring a supplied electric power amount, and optimizing an arithmetic operation speed of an image processing operation of said image input device in accordance with the obtained electric power value.