Document reading device for generating a cropped image and method for controlling the same

A document reading device, comprising:

• a document conveyer that conveys a document along a document conveying path;
• a first reader that reads, in a first reading position in the document conveying path, a first surface of the conveyed document such that a read area is larger than the conveyed document;
• a second reader that reads, in a second reading position in the document conveying path, a second surface that is opposite to the first surface such that another read area is larger than the conveyed document;
• a region detector capable of executing a process of detecting a first document region that is a region of a document in a first document image data obtained by the reading on the first surface and a process of detecting a second document region that is a region of the document in a second document image data obtained by the reading on the second surface;
• and
• a cropping processor that crops a document portion on the first surface from the first document image data as first cropped image data, and crops a document portion on the second surface from the second document image data as second cropped image data, based on one of the first and second document regions that is successfully detected, wherein,
• when the region detector successfully detects the first document region, the cropping processor crops the first document region of the first document image data as the first cropped image data, recognizes a second corresponding region corresponding to the first document region in the second document image data, and crops the second corresponding region in the second document image data as the second cropped image data.

A document reading device, comprising:

• a document conveyer that conveys a document along a document conveying path;
• a first reader that reads, in a first reading position in the document conveying path, a first surface of the conveyed document such that a read area is larger than the conveyed document;
• a second reader that reads, in a second reading position in the document conveying path, a second surface that is opposite to the first surface such that another read area is larger than the conveyed document;
• a region detector capable of executing a process of detecting a first document region that is a region of a document in a first document image data obtained by the reading on the first surface and a process of detecting a second document region that is a region of the document in a second document image data obtained by the reading on the second surface;
• and
• a cropping processor that crops a document portion on the first surface from the first document image data as first cropped image data, and crops a document portion on the second surface from the second document image data as second cropped image data, based on one of the first and second document regions that is successfully detected, wherein,
• when the region detector successfully detects the first document region, the cropping processor does not perform the process of detecting the second document region.

A method for controlling a document reading device, comprising:

• conveying a document along a document conveying path;
• reading, in a first reading position in the document conveying path, a first surface of the conveyed document such that a read area is larger than the conveyed document;
• reading, in a second reading position in the document conveying path, a second surface that is opposite to the first surface such that another read area is larger than the conveyed document;
• detecting a first document region that is a region of a document in a first document image data obtained by the reading on the first surface;
• detecting a second document region that is a region of the document in a second document image data obtained by the reading on the second surface;
• and
• cropping a document portion on the first surface from the first document image data as first cropped image data, and cropping a document portion on the second surface from the second document image data as second cropped image data, based on one of the first and second document regions that is successfully detected, wherein,
• when the document reading device fails to detect the first document region and successfully detects the second document region, the document reading device recognizes a first corresponding region that corresponds to the second document region in the first document image data and crops the first corresponding region from the first document image data as the first cropped image data.