Image reading device, and method of controlling the same

An image reading device comprising:

• a plurality of linear image sensors that are arranged so that adjacent image sensors include an overlapping region in which portions of reading regions of the adjacent image sensors overlap in a main scanning direction in which a document is read;
• a first buffer configured to store image data obtained by a first linear image sensor, which reads the document precedingly among the plurality of linear image sensors, reading an image of a predetermined line of the document;
• a second buffer configured to store image data obtained by a second linear image sensor, which is subsequent to the first linear image sensor among the plurality of linear image sensors, reading an image of the predetermined line of the document;
• and
• a circuit including at least one processor, and configured to perform:
• synthesizing first image data that corresponds to the overlapping region among the image data stored in the first buffer and second image data that corresponds to the overlapping region among the image data stored in the second buffer so as to generate image data of the overlapping region;
• generating image data of the predetermined line that corresponds to the first linear image sensor and the second linear image sensor based on image data in which image data of the overlapping region are excluded from the image data stored in the first buffer, image data in which the image data of the overlapping region are excluded from the image data stored in the second buffer, and the image data generated by the synthesizing;
• and
• executing, across in a sub-scanning direction of the document, the synthesizing and the generating.

A method of controlling an image reading device that includes a plurality of linear image sensors that are arranged so that adjacent image sensors include an overlapping region in which portions of reading regions of the adjacent image sensors overlap in a main scanning direction in which a document is read, the method comprising:

• storing image data obtained by the plurality of linear image sensors reading a predetermined line of the document;
• determining image data that corresponds to a plurality of overlapping regions with reading out the image data stored in the storing;
• synthesizing first image data obtained by a first linear image sensor and second image data obtained by as second liner sensor so as to generate image data of each of the plurality of overlapping regions, the first linear image sensor and the second linear sensor being adjacent in the main scanning direction among the plurality of linear image sensors;
• generating image data of the predetermined line of the document based on image data in which image data of the plurality of overlapping regions are excluded from the image data stored in the storing and the image data of each of the plurality of overlapping region generated in the synthesizing;
• and
• controlling so as to repeatedly execute, in a sub-scanning direction of the document, the storing, the determining, the synthesizing, and the generating on the predetermined line of the document.

A method of controlling an image reading device that includes a plurality of linear image sensors that are arranged so that adjacent image sensors include an overlapping region in which portions of reading regions of the adjacent image sensors overlap in a main scanning direction in which a document is read, the method comprising:

• first buffering image data obtained by a first linear image sensor reading an image of a predetermined line of the document, the first linear image sensor reading the document precedingly among the plurality of linear image sensors;
• second buffering image data obtained by a second linear image sensor reading an image of the predetermined line of the document, the second linear image sensor being subsequent to the first linear image sensor among the plurality of linear image sensors;
• synthesizing first image data that corresponds to the overlapping region among the image data stored in the first buffering and second image data that corresponds to the overlapping region among the image data stored in the second buffering so as to generate image data of the overlapping region;
• and
• generating image data of the predetermined line corresponding to the first linear image sensor and the second linear image sensor based on image data in which image data of the overlapping region are excluded from the image data stored in the first buffering, image data in which the image data of the overlapping region are excluded from the image data stored in the second buffering, and the image data generated in the synthesizing;
• and
• controlling so as to execute, across in a sub-scanning direction of the document, processing in the first buffering, the second buffering, the synthesizing, and the generating.