Image forming apparatus and method of controlling the same

1. An image forming apparatus comprising:

at least one document feeder to feed an original document;

a time delay integration image sensor to scan the original document and read image data including a plurality of channels each comprising a first pixel array, which is a time delay integration pixel array and a second pixel array that is not a time delay integration pixel array; and

a controller to activate a time delay integration function of the time delay integration image sensor when a direction for feed of the original document corresponds to a sub-scanning direction of the time delay integration image sensor, and to deactivate the time delay integration function of the time delay integration image sensor when the direction for feed of the original document does not correspond to the sub-scanning direction of the time delay integration image sensor, during reading of the original document, and to control a direction of time delay integration based on a relationship between a scanning or sub-scanning direction and a positioning of the first pixel array and the second pixel array.

2. The image forming apparatus according to claim 1 , wherein the at least one document feeder comprises:

a first document feeder to feed the original document in a first direction; and

a second document feed to feed the original document in an opposite direction to the first direction.

3. The image forming apparatus according to claim 2 , wherein the first document feeder is a sheet feed type document feeder to automatically feed the original document, and the second document feeder is a platen type document feeder to fix the original document onto a platen glass.

4. The image forming apparatus according to claim 1 , wherein

the second pixel array installed to be spaced apart from the first pixel array by a predetermined interval in the sub-scanning direction.

5. An image forming apparatus comprising:

at least one document feeder to feed an original document;

a time delay integration image sensor to scan the original document and read image data; and

a controller to activate a time delay integration function of the time delay integration image sensor and to read the image data from the original document, and to perform image correction for improvement of quality of the image data by acquiring a plurality of image data from a same target object at a time delay and integrating the plurality of image data when a direction for feed of the original document does not correspond to a sub-scanning direction of the time delay integration image sensor.

6. The image forming apparatus according to claim 5 , wherein the at least one document feeder comprises:

a first document feeder to feed the original document in a first direction; and

a second document feed to feed the original document in an opposite direction to the first direction.

7. The image forming apparatus according to claim 6 , wherein the first document feeder is a sheet feed type document feeder to automatically feed the original document, and the second document feeder is a platen type document feeder to fix the original document onto a platen glass.

8. The image forming apparatus according to claim 5 , wherein the time delay integration image sensor comprises:

a first pixel array; and

a second pixel array installed to be spaced apart from the first pixel array by a predetermined interval in the sub-scanning direction.

9. The image forming apparatus according to claim 8 , wherein the first pixel array is a time delay integration pixel array.

10. A method of controlling an image forming apparatus comprising at least one document feeder to feed an original document, and a time delay integration image sensor including a plurality of channels each comprising a first pixel array, which is a time delay integration pixel array and a second pixel array that is not a time delay integration pixel array to scan the original document and read image data, the method comprising:

receiving an operation command;

reading image data from the original document in response to the operation command;

activating a time delay integration function of the time delay integration image sensor when a direction for feed of the original document corresponds to a sub-scanning direction of the time delay integration image sensor during reading of the original document;

controlling a direction of the time delay integration based on a relationship between a scanning or sub-scanning direction and a positioning of the first pixel array and the second pixel array; and

deactivating the time delay integration function of the time delay integration image sensor when the direction for feed of the original document does not correspond to the sub-scanning direction of the time delay integration image sensor during the reading of the original document.

11. A method of controlling an image forming apparatus comprising at least one document feeder to feed an original document, and a time delay integration image sensor to scan the original document and read image data, the method comprising:

receiving an operation command;

activating a time delay integration function of the time delay integration image sensor to read image data from the original document in response to the operation command; and

performing image correction for improvement of quality of the image data by acquiring a plurality of image data from a same target object at a time delay and integrating the plurality of image data when a direction for feed of the original document does not correspond to a sub-scanning direction of the time delay integration image sensor.

12. An image forming apparatus comprising:

a first document feeder to feed an original document in a first direction;

a second document feed to feed the original document in a second direction;

a time delay integration image sensor including a plurality of channels each comprising a first pixel array, which is a time delay integration pixel array and a second pixel array that is not a time delay integration pixel array to scan the original document fed through the first document feeder in a first sub-scanning direction to read image data, and to scan the original document fed through the second document feeder in a second sub-scanning direction to read image data; and

a controller to deactivate a time delay integration function of the time delay integration image sensor when the original document fed through the first document feeder is scanned in the first sub-scanning direction to read the image data, and to activate the time delay integration function of the time delay integration image sensor when the original document fed through the second document feeder is scanned in the second sub-scanning direction to read the image data, and to control a direction of time delay integration based on a relationship between a scanning or sub-scanning direction and a positioning of the first pixel array and the second pixel array.

13. The image forming apparatus according to claim 12 , wherein:

the first document feeder is an automatic document feeder to automatically feed the original document and transfer the original document along a preset feed path such that the original document is scanned by the image sensor while being transferred on a sensing surface of the time delay integration image sensor in an opposite direction to the first sub-scanning direction; and

the second document feeder is a platen type document feeder to allow the original document aligned on a surface of a platen glass to be scanned while the time delay integration image sensor moves in the second sub-scanning direction when the original document is aligned on the surface of the platen glass.

14. The image forming apparatus according to claim 12 , wherein:

the first document feeder is a platen type document feeder to allow the original document aligned on a surface of a platen glass to be scanned while the time delay integration image sensor moves in the second sub-scanning direction when the original document is aligned on the surface of the platen glass; and

the second document feeder is an automatic document feeder to automatically feed the original document and transfer the original document along a preset feed path such that the original document is scanned by the image sensor while being transferred on a sensing surface of the time delay integration image sensor in an opposite direction to the first sub-scanning direction.