IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND STORAGE MEDIUM STORING IMAGE PROCESSING PROGRAM

• US 20130051683A1
• Filed: 06/29/2012
• Published: 02/28/2013
• Est. Priority Date: 08/22/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Tanaka, Hiroshi
• Granted Patent: US 8,861,883 B2
• Time in Patent Office: Days
• US Class Current: 382/203
• CPC Class Codes: G06T 5/73 Deblurring; Sharpening
• CPC Class Codes: G06V 10/993 Evaluation of the quality of the acquired pattern

Abstract

An image processing apparatus includes: a recognition unit that performs character recognition on an image including at least one character and that obtains a score indicating a recognition accuracy of at least one character region extracted through the character recognition; a local blurring-degree computation unit that computes a first degree of blurring of the at least one character region; and a blurring-degree computation unit that computes a second degree of blurring of the image by using the score and the first degree of blurring of the at least one character region.

Claims

1. An image processing apparatus comprising:

a recognition unit that performs character recognition on an image including at least one character and that obtains a score indicating a recognition accuracy of at least one character region extracted through the character recognition;

a local blurring-degree computation unit that computes a first degree of blurring of the at least one character region; and

a blurring-degree computation unit that computes a second degree of blurring of the image by using the score and the first degree of blurring of the at least one character region.

2. An image processing apparatus comprising:

a memory that stores an image including at least one character; and

a processor that executes

performing first character recognition on the image,

obtaining a first score indicating a recognition accuracy of at least one character region extracted through the first character recognition,

computing a first degree of blurring of the at least one character region, and

computing a second degree of blurring of the image by using the first score and the first degree of blurring of the at least one character region.

3. The image processing apparatus according to claim 2,

wherein the processor further executes

computing a first reliability rate indicating reliability of the first degree of blurring of the at least one character region based on the first score of the at least one character region, and

in the computing of the second degree of blurring, computing the second degree of blurring based on weighted averaging of the first degree of blurring using the first reliability rate.

4. The image processing apparatus according to claim 2,

wherein the processor further executes

performing first correction on the image by using the second degree of blurring, and

outputting the corrected image.

5. The image processing apparatus according to claim 4,

wherein in the outputting of the corrected image, when the corrected image satisfies a certain condition, the corrected image is output.

6. The image processing apparatus according to claim 5,

wherein, when the certain condition is not satisfied, the processor further executes

performing second character recognition on the corrected image,

computing a third degree of blurring of the image based on the second character recognition,

performing second correction based on the third degree of blurring,

determining whether or not a result of the second correction satisfies the certain condition, and

when the result of the second correction satisfies the certain condition, outputting the image that has been subjected to the second correction.

7. The image processing apparatus according to claim 6,

wherein the processor further executes,

computing a first reliability rate indicating reliability of the first degree of blurring of the at least one character region based on the first score of the at least one character region, and

in the computing of the second degree of blurring, computing the second degree of blurring based on weighted averaging of the first degree of blurring using the first reliability rate.

8. The image processing apparatus according to claim 7,

wherein, in the outputting of the image, when the number of character regions having a second score or a second reliability rate that is used to compute the third degree of blurring and that is equal to or more than a threshold is equal to or less than the number of character regions having the first score or the first reliability rate that is used to compute the second degree of blurring and that is equal to or more than the threshold, the image that has been subjected to the second correction is output.

9. The image processing apparatus according to claim 3,

wherein, in the computing of the first reliability rate, a probability value indicating a possibility with which a character in the at least one character region is correctly recognized is computed as the first reliability rate.

10. The image processing apparatus according to claim 3,

wherein, in the computing of the first degree of blurring, at least one character region is selected from the at least one extracted character region based on the first score or the first reliability rate, and the first degree of blurring is computed for the at least one selected character region.

11. An image processing method executed by a computer, the image processing method comprising:

performing first character recognition on an image including at least one character;

obtaining a score indicating a recognition accuracy of at least one character region extracted through the first character recognition;

computing a first degree of blurring of the at least one character region; and

computing a second degree of blurring of the image by using the score and the first degree of blurring of the at least one character region.

12. The image processing method according to claim 11, the image processing method further comprising:

computing a reliability rate indicating reliability of the first degree of blurring of the at least one character region based on the score of the at least one character region; and

in the computing of the second degree of blurring, computing the second degree of blurring based on weighted averaging of the first degree of blurring using the reliability rate.

13. The image processing method according to claim 11, the image processing method further comprising:

performing first correction on the image by using the second degree of blurring; and

outputting the corrected image.

14. The image processing method according to claim 13,

wherein in the outputting of the corrected image, when the corrected image satisfies a certain condition, the corrected image is output.

15. The image processing method according to claim 14, the image processing method further comprising:

when the certain condition is not satisfied,

performing second character recognition on the corrected image;

computing a third degree of blurring of the image based on the second character recognition;

performing second correction based on the third degree of blurring;

determining whether or not a result of the second correction satisfies the certain condition; and

when the result of the second correction satisfies the certain condition, outputting the image that has been subjected to the second correction.

16. A storage medium storing an image processing program that causes a computer to execute operations, the operations comprising:

performing first character recognition on an image including at least one character;

obtaining a score indicating a recognition accuracy of at least one character region extracted through the first character recognition;

computing a first degree of blurring of the at least one character region; and

computing a second degree of blurring of the image by using the score and the first degree of blurring of the at least one character region.

17. The storage medium according to claim 16, the operations further comprising:

computing a reliability rate indicating reliability of the first degree of blurring of the at least one character region based on the score of the at least one character region; and

in the computing of the second degree of blurring, computing the second degree of blurring based on weighted averaging of the first degree of blurring using the reliability rate.

18. The storage medium according to claim 16, the operations further comprising:

performing first correction on the image by using the second degree of blurring; and

outputting the corrected image.

19. The storage medium according to claim 18,

wherein in the outputting of the corrected image, when the corrected image satisfies a certain condition, the corrected image is output.

20. The storage medium according to claim 19, the operations further comprising:

when the certain condition is not satisfied,

performing second character recognition on the corrected image;

computing a third degree of blurring of the image based on the second character recognition;

performing second correction based on the third degree of blurring;

determining whether or not a result of the second correction satisfies the certain condition; and

when the result of the second correction satisfies the certain condition, outputting the image that has been subjected to the second correction.