Image processing apparatus, image reading apparatus, image forming apparatus, information acquisition system, image processing method, and program

Abstract

The objective is to appropriately determine whether or not to perform tilt correction and to prevent image distortion caused by tilt correction. [Solution] The system includes a tilt detection unit that detects the tilt of a transported object based on an image read from the object, and a tilt correction unit that corrects the image based on the tilt of the object. The tilt correction unit determines whether or not to correct the image based on the width of the object in a direction perpendicular to the transport direction of the object and the width of an object guide that guides the transport of the object.

Claims

1. A tilt detection unit detects the tilt of the object being transported based on the image read from the object, A tilt correction unit that corrects the image based on the tilt of the subject, Equipped with, The tilt correction unit is characterized by determining whether or not to correct the image based on the width of the subject in a direction perpendicular to the transport direction of the subject and the width of the subject guide that guides the transport of the subject.

2. The image processing apparatus according to claim 1, wherein the tilt correction unit corrects the image when the difference obtained by subtracting the width of the subject from the width of the subject guide is greater than a first threshold, and does not correct the image when the difference is not greater than the first threshold.

3. The tilt correction unit is, If the difference obtained by subtracting the width of the subject from the width of the subject guide is greater than the first threshold, or if the length of the subject in a direction parallel to the transport direction is less than the width of the subject, the image is corrected. The image processing apparatus according to claim 1, wherein the image is not corrected when the difference is not greater than the first threshold and the length of the subject is not less than the width of the subject.

4. The image processing apparatus according to claim 1, wherein the tilt correction unit further determines whether or not to correct the image based on the transport speed of the subject.

5. The tilt correction unit is, If the difference obtained by subtracting the width of the subject from the width of the subject guide is greater than the first threshold, and the transport speed is greater than the second threshold, the image is corrected. The image processing apparatus according to claim 4, wherein the image is not corrected if the difference is not greater than the first threshold, or if the transport speed is not greater than the second threshold.

6. The image processing apparatus according to claim 1, further comprising a size detection unit for detecting the width of the subject based on the aforementioned image.

7. A transport means for transporting the subject, A subject guide that guides the transport of the aforementioned subject, A reading unit for reading the subject, An image processing apparatus according to any one of claims 1 to 6, An image reading device having [a certain feature].

8. A subject tray on which the subject is placed, The image reading device according to claim 7, further comprising a first sensor disposed near the subject tray for detecting the width of the subject.

9. The image reading device according to claim 7, further comprising a first sensor for detecting the width of the subject between the position where the transport means starts transporting the subject and the reading position of the reading unit.

10. A second sensor for detecting the length of the subject, The system further includes a setting unit for setting the orientation of the subject, It further possesses, The image reading device according to claim 7, wherein the tilt correction unit determines whether or not to correct the image based on the length of the subject detected by the second sensor and the width of the subject obtained from the orientation set by the setting unit.

11. It further includes a setting unit for setting the size and orientation of the subject, The image reading device according to claim 7, wherein the tilt correction unit determines whether or not to correct the image based on the width of the subject obtained from the size and orientation set by the setting unit.

12. It further includes a setting unit for setting the width of the subject, The image reading device according to claim 7, wherein the tilt correction unit determines whether or not to correct the image based on the width of the subject set by the setting unit.

13. The image reading device according to claim 7, An image forming unit that forms an image on a medium based on the image read by the aforementioned image reading device, An image forming apparatus having

14. The image reading device according to claim 7, Information acquisition means for acquiring information about the subject from the aforementioned image, An information acquisition system.

15. An image processing method performed by an image processing device, A tilt detection step in which the tilt of the transported object is detected based on the image read from the object, A tilt correction step that corrects the image based on the tilt of the subject, Includes, The tilt correction step is characterized by determining whether or not to correct the image based on the width of the subject in a direction perpendicular to the transport direction of the subject and the width of the subject guide that guides the transport of the subject.

16. Computers, A tilt detection means for detecting the tilt of a transported object based on an image read from the object, A tilt correction means for correcting the image based on the tilt of the subject, It is designed to function as such. The tilt correction means is a program that determines whether or not to correct the image based on the width of the subject in a direction perpendicular to the transport direction of the subject and the width of the subject guide that guides the transport of the subject.

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