Image processing apparatus and control method thereof, image reading apparatus, and storage medium

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.