Data transmission apparatus, system and method, and image processing apparatus

An image processing system having devices connected by a serial bus, comprising:

• recognition means for recognizing processing capability information indicative of an image-data processing capability of a receiving device of image data transfer, prior to the image data transfer;
• determination means for determining a data block size of image data transmitted by a transmitting device, in accordance with the processing capability information recognized by said recognition means;
• and
• transfer means for sequentially transferring the image data in the data block size determined by determination means from said transmitting device to said receiving device.

An image processing apparatus for processing image data sent to a target device through a serial bus, comprising:

• reception means for receiving processing capability information indicative of an image-data processing capability of said target device, prior to image data transfer;
• determination means for determining a data block size of image data to be transferred, in accordance with the processing capability information received by said reception means;
• and
• transmission means for sequentially transmitting the image data in the data block size determined by said determination means to said target device.

A data transmission method for host and target devices connected by a serial bus, said method comprising the steps of:

• transmitting data amount information indicative of an amount of data to be transferred between said host device and said target device by asynchronous transfer;
• transferring the data in accordance with the data amount information;
• and
• if next data transfer is performed, performing the next data transfer without transmission of the data amount information.

An image processing apparatus for processing image data received from a host device through a serial bus, comprising:

• communication means for communicating data amount information indicative of an amount of data to be transferred with said host device, by asynchronous transfer;
• and
• reception means for receiving image data transferred from said host device in accordance with the data amount information,
• wherein if next data transfer is performed, the next data transfer is performed without communication of the data amount information.

An image processing apparatus for processing image data sent to a target device through a serial bus, comprising:

• communication means for communicating data amount information indicative of an amount of data to be transferred with said target device, by asynchronous transfer;
• and
• transmission means for transmitting image data to said target device in accordance with the data amount information,
• wherein if next data transfer is performed, the next data transfer is performed without communication of the data amount information.

A computer program product comprising a computer readable medium having computer program codes, for executing data transmission between devices connected by a serial bus, said product comprising:

• communication process procedure codes for notifying processing capability information indicative of a data processing capability of a receiving device of data transfer, from said receiving device to a transmitting device of the data transfer, prior to start of the data transfer;
• determination process procedure codes for determining a data block size of data to be transferred by said transmitting device, in accordance with the notified processing capability information;
• and
• transmission process procedure codes for transmitting the data in the determined data block size from said transmitting device to said receiving device.

A computer program product comprising a computer readable medium having computer program codes, for executing data transmission between devices connected by a serial bus, said product comprising:

• recognition process procedure codes for recognizing processing capability information indicative of an image-data processing capability of a receiving device of image data transfer, prior to the image data transfer;
• determination process procedure codes for determining a data block size of image data transmitted by a transmitting device, in accordance with the processing capability information recognized at said recognition process;
• and
• transmission process procedure codes for sequentially transferring the image data in the data block size determined at said determination process from said transmitting device to said receiving device.

A computer program product comprising a computer readable medium having computer program codes, for executing data transmission between host and target devices connected by a serial bus, said product comprising:

• communication process procedure codes for transmitting data amount information indicative of an amount of data to be transferred between said host device and said target device by asynchronous transfer;
• transmission process procedure codes for transferring the data in accordance with the data amount information;
• and
• control process procedure codes for, if next data transfer is performed, performing the next data transfer without transmission of the data amount information.