Image processing apparatus and control method thereof, image reading apparatus, and a non-transitory computer-readable storage medium comprising a sub-scanning direction processing unit configured to perform reduction processing, and a main-scanning direction processing unit to connect data after reduction processing and reduces the connected data

An image processing method that performs processes of reducing read data from an image reading apparatus in a main-scanning direction and a sub-scanning direction orthogonal to the main-scanning direction, wherein

• the image reading apparatus includes a plurality of line image sensors having a longitudinal direction as the main-scanning direction disposed in the main-scanning direction, the plurality of line image sensors are displaced in the sub-scanning direction, and the image reading apparatus relatively moves the plurality of line image sensors and an original in the sub-scanning direction to read an image on the original, wherein
• the image processing method comprises:
• performing a sub-scanning direction process that performs reduction processing for each of the plurality of line image sensors in the sub-scanning direction;
• and
• performing a main-scanning direction process that connects data after the reduction processing is performed for each of the plurality of line image sensors in the sub-scanning direction process in the main-scanning direction and reduces the connected data in the main-scanning direction.

A non-transitory computer-readable storage medium that stores a program for causing a computer to execute respective processes of an image processing method that performs processes of reducing read data from an image reading apparatus in a main-scanning direction and a sub-scanning direction orthogonal to the main-scanning direction, wherein

• the image reading apparatus includes a plurality of line image sensors having a longitudinal direction as the main-scanning direction disposed in the main-scanning direction, the plurality of line image sensors are displaced in the sub-scanning direction, and the image reading apparatus relatively moves the plurality of line image sensors and an original in the sub-scanning direction to read an image on the original, wherein
• the image processing method comprises:
• performing a sub-scanning direction process that performs reduction processing for each of the plurality of line image sensors in the sub-scanning direction;
• and
• performing a main-scanning direction process that connects data after the reduction processing is performed for each of the plurality of line image sensors in the sub-scanning direction process in the main-scanning direction and reduces the connected data in the main-scanning direction.