Image processing apparatus having functions including scan function, control method thereof, and storage medium storing program for executing control method

Abstract

An image processing apparatus that executes jobs in parallel using a small number of resources. A controller includes an image processor that applies an image process to image data. A scanner controller includes storage for storing image data generated by scanning a document with a scanner and transfers the image data stored to the controller through a data bus. A processor executes instructions to set a frequency of an image transfer clock to a first frequency when a first job including a process that transfers image data generated by scanning documents to the controller is executed alone, and set the frequency of the image transfer clock to a second frequency lower than the first frequency when the first job is executed in parallel to a second job including an image process. The frequency of the image transfer clock is maintained at the second frequency until finishing the first job.