An image processing apparatus includes a memory, a correction circuit, and a calculation circuit. The memory stores image data of an original image that is moved in a sub-scanning direction with respect to an image sensor. The correction circuit sequentially reads the image data from the memory line by line in the main scanning direction, extracts a pixel in a position corresponding to the inclination, and forms an inclination-corrected line in the main scanning direction to correct the inclination. The calculation circuit calculates an amount of movement of a corner of the original image with respect to the sub-scanning direction before and after correction of inclination of the original image with respect to a main scanning direction. The correction circuit restricts progress of formation of the inclination-corrected line based on the amount of movement. The amount of movement is applied when the inclination of the original image is corrected.

There is provided an image scanner apparatus, including: a platen; a carriage including an image sensor that captures an image of a script on the platen; an antenna unit on the carriage; and a controller circuit that controls the carriage to move in a forward way and a backward way in a sub-scanning direction over the platen, detects a position of an NFC (Near Field Communication) tag on the script in the sub-scanning direction via the antenna unit, and then detects a position of the NFC tag in a main-scanning direction via the antenna unit.

An image reader including a document table having a reference point, a first region of a sheet having a predetermined size when a vertex of the sheet is positioned on the reference point, and a second region, a changing mechanism changing a reading position in a sub scanning direction, and a controller configured to control the changing mechanism to change the reading position to a first position such that a distance in the sub scanning direction between the reference point and the first position corresponds to a length of the predetermined sheet size in the sub scanning direction, acquire specific digital data of the second region through image reading in the first position with a light source turned off, compare a particular value of the specific digital data with a criterion value within the second region, and determine a state of a document cover based on the comparison.

An image reader including a document table having a reference point, a first region of a sheet having a predetermined size when a vertex of the sheet is positioned on the reference point, and a second region, a changing mechanism changing a reading position in a sub scanning direction, and a controller configured to control the changing mechanism to change the reading position to a first position such that a distance in the sub scanning direction between the reference point and the first position corresponds to a length of the predetermined sheet size in the sub scanning direction, acquire specific digital data of the second region through image reading in the first position with a light source turned off, compare a particular value of the specific digital data with a criterion value within the second region, and determine a state of a document cover based on the comparison.

There is provided an image scanner apparatus, including: a platen; a carriage including an image sensor that captures an image of a script on the platen; an antenna unit on the carriage; and a controller circuit that controls the carriage to move in a forward way and a backward way in a sub-scanning direction over the platen, detects a position of an NFC (Near Field Communication) tag on the script in the sub-scanning direction via the antenna unit, and then detects a position of the NFC tag in a main-scanning direction via the antenna unit.

A document scanning apparatus reading an image of a document includes a signal output unit configured to output a pulse signal at predetermined intervals, a sensor configured to detect a document set on a platen glass, the sensor having a light emitting unit configured to emit light in response to a pulse signal output from the signal output unit and a light receiving unit configured to output a detection signal in accordance with light output from the light emitting unit, and a control unit configured to receive the detection signal output from the light receiving unit. In this case, the signal output unit outputs the pulse signal at a different time point from the predetermined intervals in response to a request from an external apparatus.

An image reader including a document table having a reference point, a first region of a sheet having a predetermined size when a vertex of the sheet is positioned on the reference point, and a second region, a changing mechanism changing a reading position in a sub scanning direction, and a controller configured to control the changing mechanism to change the reading position to a first position such that a distance in the sub scanning direction between the reference point and the first position corresponds to a length of the predetermined sheet size in the sub scanning direction, acquire specific digital data of the second region through image reading in the first position with a light source turned off, compare a particular value of the specific digital data with a criterion value within the second region, and determine a state of a document cover based on the comparison.

An image reader including a document table having a reference point, a first region of a sheet having a predetermined size when a vertex of the sheet is positioned on the reference point, and a second region, a changing mechanism changing a reading position in a sub scanning direction, and a controller configured to control the changing mechanism to change the reading position to a first position such that a distance in the sub scanning direction between the reference point and the first position corresponds to a length of the predetermined sheet size in the sub scanning direction, acquire specific digital data of the second region through image reading in the first position with a light source turned off, compare a particular value of the specific digital data with a criterion value within the second region, and determine a state of a document cover based on the comparison.