Patent ID: 8848260

Claim:
An image processing apparatus, comprising: a data output control unit to output image data on a line-by-line basis in response to a line synchronizing signal; and a data output interface circuit to transfer via a bus the image data that is output from the data output control unit on a line-by-line basis in response to the line synchronizing signal, wherein the data output interface circuit makes a transition, together with the bus, from a normal state to a power saving state when a predetermined check period next following completion of transfer, by the data output interface circuit, of image data for one line output from the data output control unit passes before transfer of image data for a next one line, and returns, together with the bus, from the power saving state to the normal state for transfer of image data for the next one line, and wherein the image processing apparatus further comprises: a pseudo-data transfer determining unit to detect a state of image data output from the data output control unit to the data output interface circuit on a line-by-line basis, and to decide based on the detected state whether to output pseudo data to the data output interface circuit before an end of the predetermined check period following completion of transfer, by the data output interface circuit, of image data for one line, the pseudo data serving to prevent the data output interface circuit and the bus from making a transition to the power saving state; and a pseudo data transfer unit to output the pseudo data to the data output interface circuit before the end of the predetermined check period following completion of transfer, by the data output interface circuit, of image data for one line, the outputting of the pseudo data being in response to an event that the pseudo-data transfer determining unit decides to output the pseudo data to the data output interface circuit before the end of the predetermined check period following completion of transfer, by the data output interface circuit, of image data for one line.