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basicOCR/basicOCR/preprocessing.cpp at master · Overlord-R/basicOCR · GitHub
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preprocessing.cpp
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/*
* preprocessing.c
*
*
* Created by damiles on 18/11/08.
* Copyright 2008 __MyCompanyName__. All rights reserved.
*
*/
#
include
"
preprocessing.h
"
#
ifdef
_CH_
#
pragma
package <opencv>
#
endif
#
ifndef
_EiC
#
include
"
cv.h
"
#
include
"
highgui.h
"
#
include
<
stdio.h
>
#
include
<
ctype.h
>
#
include
<
math.h
>
#
endif
/*
****************************************************************
*
* Find the min box. The min box respect original aspect ratio image
* The image is a binary data and background is white.
*
******************************************************************
*/
void
findX
(IplImage* imgSrc,
int
* min,
int
* max){
int
i;
int
minFound=
0
;
CvMat data;
CvScalar maxVal=
cvRealScalar
(imgSrc->
width
*
255
);
CvScalar val=
cvRealScalar
(
0
);
//
For each col sum, if sum < width*255 then we find the min
//
then continue to end to search the max, if sum< width*255 then is new max
for
(i=
0
; i< imgSrc->
width
; i++){
cvGetCol
(imgSrc, &data, i);
val=
cvSum
(&data);
if
(val.
val
[
0
] < maxVal.
val
[
0
]){
*max= i;
if
(!minFound){
*min= i;
minFound=
1
;
}
}
}
}
void
findY
(IplImage* imgSrc,
int
* min,
int
* max){
int
i;
int
minFound=
0
;
CvMat data;
CvScalar maxVal=
cvRealScalar
(imgSrc->
width
*
255
);
CvScalar val=
cvRealScalar
(
0
);
//
For each col sum, if sum < width*255 then we find the min
//
then continue to end to search the max, if sum< width*255 then is new max
for
(i=
0
; i< imgSrc->
height
; i++){
cvGetRow
(imgSrc, &data, i);
val=
cvSum
(&data);
if
(val.
val
[
0
] < maxVal.
val
[
0
]){
*max=i;
if
(!minFound){
*min= i;
minFound=
1
;
}
}
}
}
CvRect
findBB
(IplImage* imgSrc){
CvRect aux;
int
xmin, xmax, ymin, ymax;
xmin=xmax=ymin=ymax=
0
;
findX
(imgSrc, &xmin, &xmax);
findY
(imgSrc, &ymin, &ymax);
aux=
cvRect
(xmin, ymin, xmax-xmin, ymax-ymin);
return
aux;
}
IplImage
preprocessing
(IplImage* imgSrc,
int
new_width,
int
new_height){
IplImage* result;
IplImage* scaledResult;
CvMat data;
CvMat dataA;
CvRect bb;
//
bounding box
CvRect bba;
//
boundinb box maintain aspect ratio
//
Find bounding box
bb=
findBB
(imgSrc);
//
Get bounding box data and no with aspect ratio, the x and y can be corrupted
cvGetSubRect
(imgSrc, &data,
cvRect
(bb.
x
, bb.
y
, bb.
width
, bb.
height
));
//
Create image with this data with width and height with aspect ratio 1
//
then we get highest size betwen width and height of our bounding box
int
size=(bb.
width
>bb.
height
)?bb.
width
:bb.
height
;
result=
cvCreateImage
(
cvSize
( size, size ),
8
,
1
);
cvSet
(result,
CV_RGB
(
255
,
255
,
255
),
NULL
);
//
Copy de data in center of image
int
x=(
int
)
floor
((
float
)(size-bb.
width
)/
2
.
0f
);
int
y=(
int
)
floor
((
float
)(size-bb.
height
)/
2
.
0f
);
cvGetSubRect
(result, &dataA,
cvRect
(x,y,bb.
width
, bb.
height
));
cvCopy
(&data, &dataA,
NULL
);
//
Scale result
scaledResult=
cvCreateImage
(
cvSize
( new_width, new_height ),
8
,
1
);
cvResize
(result, scaledResult,
CV_INTER_NN
);
//
Return processed data
return
*scaledResult;
}
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