Image processing apparatus and control method thereof, and reading method in image reading system

A method of controlling an image processing apparatus which reads an original placed on an original plate as digital image data using an image reading unit, comprising:

• a detection step of detecting a code image, which is recorded on an original and includes reading setting information, from an image read by a prescan using the image reading unit;
• an extraction step of extracting the reading setting information from the detected code image;
• and
• a reading control step of executing a main scan using the image reading unit based on the extracted reading setting information,
• wherein the reading setting information includes reading range information designated by a relative position to the original that records the code image with reference to a position and a direction of the code image.

A reading method in an image reading system, which comprises a reading unit adapted to read an original placed on an original plate as image information according to reading setting information, and an information code detection unit adapted to detect an information code from the image information, comprising:

• a step of acquiring size information of a specific region from the information code detected by the information code detection unit;
• a step of acquiring relative position information of the information code to the specific region from the information code;
• a step of generation the reading setting information based on the size information and the relative position information, and extracting information of the specific region from the image information;
• and
• a step of determining the presence/absence of a modification to the placed original based on the extracted information of the specific region,
• wherein the image information is discarded if the absence of a modification is determined in the determining step, and the image information is saved if the presence of a modification is determined in the determining step.