Image processing method and apparatus to scan on both sides of a document

A non-transitory computer-readable storage medium which stores a program for causing a computer of an image processing apparatus, including a plurality of scanning units configured to scan on both sides of a document, the plurality of scanning units including a first scanning unit and a second scanning unit, an image processing unit configured to execute image processing based on image data obtained by scanning of any one of the plurality of scanning units, and a transfer unit configured to transfer first image data obtained by the first scanning unit scanning on a first side of the document to the image processing unit in accordance with a synchronous signal, and after completion of transfer of the first image data, transfer second image data obtained by the second scanning unit scanning on a second side of the document to the image processing unit in accordance with the synchronous signal, to execute steps of:

• setting processing contents of the image processing to be executed by the image processing unit;
• and
• changing, when transferring the second image data on which the image processing is not executed by the image processing unit, from a storage unit in which the second image data has been temporarily stored, to the image processing unit, a cycle time of the synchronous signal in accordance with the processing contents set in the setting step.

An image scanning apparatus for transferring image data to an image processing unit configured to execute image processing based on the image data, comprising:

• a plurality of scanning units configured to scan on both sides of a document, the plurality of scanning units including a first scanning unit and a second scanning unit;
• a transfer unit configured to transfer first image data obtained by the first scanning unit scanning on a first side of the document to the image processing unit in accordance with a synchronous signal, and after completion of transfer of the first image data, transfer second image data obtained by the second scanning unit scanning on a second side of the document to the image processing unit in accordance with the synchronous signal, wherein the second image data is temporarily stored in a storage unit before transfer of the second image data,
• wherein the transfer unit transfers the second image data on which the image processing is not executed by the image processing unit, from the storage unit in which the second image data has been temporarily stored, to the image processing unit in accordance with the synchronous signal, whose cycle time is changed in accordance with processing contents of the image processing to be executed by the image processing unit.