Bus system for accessing a memory in an image processing system

An image processing system comprising a control section which receives and provides various control signals, at least one image data input/output section into which image data is input and from which image data is output in response to a control signal from the control section, an image memory which temporarily stores the image data input from the at least one image data input/output section and at least one image processing section which reads out the image data from the image memory in response to a control signal from the control section and processes the image data, wherein the improvement comprises:

• a data bus control section which is connected to the image memory by way of a single data bus and to the at least one image data input/output section and the at least one image processing section by way of respective data buses;
• packs into a parallel format a plurality of serially received pieces of image data, input to the data bus control section from the at least one image data input/output section and/or the at least one image processing section, thereby forming packed image data, and outputs the packed image data to the image memory in response to a control signal from the control section;
• and unpacks packed image data input to the data bus control section from the image memory into a plurality of pieces of image data and outputs the pieces of image data to the at least one image data input/output section and/or the at least one image processing section in response to a control signal from the control section.