JP2010130441A5

JP2010130441A5 -

Info

Publication number: JP2010130441A5
Application number: JP2008303937A
Authority: JP
Filing date: 2008-11-28
Publication date: 2011-08-04
Anticipated expiration: 2028-11-28

Claims

A character area detecting means for detecting a character area from the photographed image;
An inclination angle detecting means for detecting an inclination angle of a character string from the character area detected by the character area detecting means;
Inclination angle correcting means for correcting the inclination angle of the character string so that the inclination angle becomes a predetermined angle;
Character string aspect ratio detection means for detecting an aspect ratio of a character in a character string whose inclination angle is corrected by the inclination angle correction means,
An aspect ratio correction unit that corrects the character aspect ratio of the character string with the tilt angle corrected so that the aspect ratio detected by the character string aspect ratio detection unit is a predetermined value;
A character image correction apparatus comprising:

A plurality of reference images in which character strings having predetermined different inclination angles are formed in advance,
The inclination angle detecting means is
For the character strings in the plurality of reference images, calculate a degree of correlation representing the similarity of the inclination angle of the character string in the character area detected by the character area detection means,
Based on the inclination angle of the character string of the reference image having a high degree of correlation among the plurality of reference images, the inclination angle of the character string in the character area detected by the character area detection means is detected. ,
The character image correction apparatus according to claim 1, wherein

The character string aspect ratio detecting means is
The character string character string direction and projected to each of the character string direction orthogonal to the character string direction, said projected the character string direction, and the character string direction perpendicular to each pixel distribution detection for detecting the pixel distribution in the Means,
First character size detection means for detecting a character size in a direction orthogonal to the character string direction of the character string based on the pixel distribution in the character string direction detected by the pixel distribution detection means;
Second character size detection means for detecting a character size in the character string direction of the character string based on the pixel distribution in the character string orthogonal direction detected by the pixel distribution detection means;
With
The aspect ratio is detected based on a ratio between the character size detected by the first character size detecting unit and the character size detected by the second character size detecting unit.
The character image correction apparatus according to claim 1 or 2, wherein

A character area detection procedure for detecting a character area from a captured image;
An inclination angle detection procedure for detecting an inclination angle of a character string from the character area detected by the character area detection procedure;
An inclination angle correction procedure for correcting the inclination angle of the character string so that the inclination angle becomes a predetermined angle;
A character string aspect ratio detection procedure for detecting an aspect ratio of a character in a character string whose inclination angle is corrected by the inclination angle correction procedure;
An aspect ratio correction procedure for correcting the character aspect ratio of the character string whose tilt angle has been corrected so that the aspect ratio detected in the character string aspect ratio detection procedure has a predetermined value;
A character image correction method comprising:

Using a plurality of reference images in which character strings having different inclination angles are formed in advance,
In the inclination angle detection procedure,
For the character strings in the plurality of reference images, calculate a correlation indicating the similarity of the inclination angle of the character string in the character area detected in the character area detection procedure,
Based on the inclination angle of the character string of the reference image having a high degree of correlation among the plurality of reference images, the inclination angle of the character string in the character area detected in the character area detection procedure is detected.
The character image correction method according to claim 4, wherein:

In the character string aspect ratio detection procedure,
The character string character string direction and projected to each of the character string direction orthogonal to the character string direction, said projected the character string direction, and the character string direction perpendicular to each pixel distribution detection for detecting the pixel distribution in the Procedure and
A first character size detection procedure for detecting a character size in a direction orthogonal to the character string direction of the character string based on the pixel distribution in the character string direction detected by the pixel distribution detection procedure;
A second character size detection procedure for detecting a character size of the character string in the character string direction based on the pixel distribution in the character string orthogonal direction detected by the pixel distribution detection procedure;
Use
Detecting the aspect ratio based on a ratio between the character size detected in the first character size detection procedure and the character size detected in the second character size detection procedure;
6. The character image correction method according to claim 4, wherein