An image forming apparatus, which includes a first storage, a second storage, and a bus, includes a first controller configured to store first image data based on input image data, in the first storage, when the input image data is input via the bus; a second controller configured to store second image data based on the first image data, in the second storage; a third controller configured to store third image data based on the second image data, in the first storage; a fourth controller configured to output output image data based on the third image data; and an image former configured to perform image formation based on the output image data.

An image forming apparatus which is capable of reducing a load on a data bus therein when controlling an image reading apparatus depending on its image processing capability. When acquired identification information about the image forming apparatus is included in a clock control table 600, a clock frequency for controlling hardware of the image reading apparatus in accordance with the clock control table 600, while setting the clock frequency therefor to a default setting of the clock control table 600 when the acquired identification information is not included in the clock control table 600, wherein a minimum value of clock frequencies in the clock control table 600 is set as the default setting of the clock control table 600.

In a general aspect, a method for authenticating a plurality of slave devices connected to a master device can include: generating and sending by the master device a respective challenge to each slave device; in each slave device, generating a response to the respective challenge and transmitting it to the master device; verifying by the master device the response of one of the slave devices; returning by the master device the remaining responses to respective slave devices distinct from those that generated the responses; and verifying by each slave device the response returned thereto by the master device and transmitting the result of the verification to the master device.

An image reading apparatus in which a session timeout does not take place in a case where user's confirmation is obtained before image data obtained by reading originals is transmitted. Before transmission of image data, a control unit determines whether a protocol having a time out is selected. If the selected protocol has a timeout, the control unit determines whether a memory is in a memory full state each time image data of one page is stored into the memory. If the memory is in a memory full state, the user is requested to confirm as to whether transmission is to be performed. If the necessity of transmission is confirmed by the user, the control unit establishes a session with a destination and transmits image data of pages stored in the memory to the destination.

There are provided an image forming apparatus that is connected to an information apparatus via a USB and a method of controlling the same. The image forming apparatus includes a Web server, a Web application that operates on the Web server, and a communication unit that performs communication by Internet Protocol. The image forming apparatus transfers data, received by a transmission/reception unit that transmits/receives data to/from the information apparatus via the USB, to the Web server via the communication unit.

An electronic apparatus includes a power switch element configured to switch on and off power supply, a power-source supply controller configured to request an external apparatus for the power supply when coupling with the external apparatus is established, and a power switch configured to switch on and off the power switch element. The power-source supply controller includes an output unit configured to switch from a first state to a second state when the coupling with the external apparatus is established. The electronic apparatus includes a power controlling switch element between the power switch element and the output unit, the power controlling switch element being configured to keep the power switch element off by remaining off until the power switch is operated when the output unit is in the second state and the power switch element is off.