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arrayfire/examples/image_processing/image_editing.cpp at master · arrayfire/arrayfire · GitHub
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arrayfire
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examples
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image_processing
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image_editing.cpp
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arrayfire
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examples
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image_processing
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image_editing.cpp
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/*
******************************************************
* Copyright (c) 2014, ArrayFire
* All rights reserved.
*
* This file is distributed under 3-clause BSD license.
* The complete license agreement can be obtained at:
* http://arrayfire.com/licenses/BSD-3-Clause
*******************************************************
*/
#
include
<
arrayfire.h
>
#
include
<
cmath
>
#
include
<
cstdio
>
#
include
<
cstdlib
>
using
namespace
af
;
/*
*
* contrast value should be in the rnage [-1,1]
*
*/
array
changeContrast
(
const
array &in,
const
float
contrast) {
float
scale =
tan
((contrast +
1
) * Pi /
4
);
return
(((in /
255
.
0f
-
0
.
5f
) * scale +
0
.
5f
) *
255
.
0f
);
}
/*
*
* brightness value should be in the rnage [0,1]
*
*/
array
changeBrightness
(
const
array &in,
const
float
brightness,
const
float
channelMax =
255
.
0f
) {
float
factor = brightness * channelMax;
return
(in + factor);
}
array
clamp
(
const
array &in,
float
min =
0
.
0f
,
float
max =
255
.
0f
) {
return
((in < min) *
0
.
0f
+ (in > max) *
255
.
0f
+
(in >= min && in <= max) * in);
}
/*
*
* radius effects the level of details that will effected during sharpening
* process amount value should be in the range [0,1] or [1,] note: value of 1.0
* for amount results unsharp masking values > 1.0 results in highboost filter
* effect
*
*/
array
usm
(
const
array &in,
float
radius,
float
amount) {
int
gKernelLen
=
2
* radius +
1
;
array blurKernel =
gaussianKernel
(
gKernelLen
,
gKernelLen
);
array blur =
convolve
(in, blurKernel);
return
(in + amount * (in - blur));
}
/*
*
* x,y - starting position of zoom
* width, height - dimensions of the rectangle to where we have to zoom in
*
*/
array
digZoom
(
const
array &in,
int
x,
int
y,
int
width,
int
height) {
array cropped =
in
(
seq
(x, width -
1
),
seq
(y, height -
1
), span);
return
resize
(cropped, (
unsigned
)in.
dims
(
0
), (
unsigned
)in.
dims
(
1
));
}
/*
*
* a - foregound image
* b - background image
* mask - mask map
*
*/
array
alphaBlend
(
const
array &a,
const
array &b,
const
array &mask) {
array tiledMask;
if
(mask.
dims
(
2
) != a.
dims
(
2
)) tiledMask =
tile
(mask,
1
,
1
, a.
dims
(
2
));
return
a * tiledMask + (
1
.
0f
- tiledMask) * b;
}
void
normalizeImage
(array &in) {
float
min = af::min<
float
>(in);
float
max = af::max<
float
>(in);
in =
255
.
0f
* ((in - min) / (max - min));
}
/*
*
* dimensions of the mask control the thickness of the boundary that
* will be extracted by the following function
*/
array
boundary
(
const
array &in,
const
array &mask) {
array ret_val = in -
erode
(in, mask);
normalizeImage
(ret_val);
return
ret_val;
}
int
main
(
int
argc,
char
**argv) {
try
{
int
device = argc >
1
?
atoi
(argv[
1
]) :
0
;
af::setDevice
(device);
af::info
();
array man =
loadImage
(
ASSETS_DIR
"
/examples/images/man.jpg
"
,
true
);
array fight =
loadImage
(
ASSETS_DIR
"
/examples/images/fight.jpg
"
,
true
);
array nature =
resize
(
loadImage
(
ASSETS_DIR
"
/examples/images/nature.jpg
"
,
true
),
fight.
dims
(
0
), fight.
dims
(
1
));
array intensity =
colorSpace
(fight,
AF_GRAY
,
AF_RGB
);
array mask =
clamp
(intensity,
10
.
0f
,
255
.
0f
) >
0
.
0f
;
array blend =
alphaBlend
(fight, nature, mask);
array highcon =
changeContrast
(man,
0.3
);
array highbright =
changeBrightness
(man,
0.2
);
array translated =
translate
(man,
100
,
100
,
200
,
126
);
array sharp =
usm
(man,
3
,
1.2
);
array zoom =
digZoom
(man,
28
,
10
,
192
,
192
);
array morph_mask =
constant
(
1
,
3
,
3
);
array bdry =
boundary
(man, morph_mask);
af::Window
wnd
(
"
Image Editing Operations
"
);
printf
(
"
Press ESC while the window is in focus to exit
\n
"
);
while
(!wnd.
close
()) {
wnd.
grid
(
2
,
5
);
wnd
(
0
,
0
).
image
(man /
255
,
"
Input
"
);
wnd
(
1
,
0
).
image
(highcon /
255
,
"
High Contrast
"
);
wnd
(
0
,
1
).
image
(highbright /
255
,
"
High Brightness
"
);
wnd
(
1
,
1
).
image
(translated /
255
,
"
Translation
"
);
wnd
(
0
,
2
).
image
(sharp /
255
,
"
Unsharp Masking
"
);
wnd
(
1
,
2
).
image
(zoom /
255
,
"
Digital Zoom
"
);
wnd
(
0
,
3
).
image
(nature /
255
,
"
Background for blend
"
);
wnd
(
1
,
3
).
image
(fight /
255
,
"
Foreground for blend
"
);
wnd
(
0
,
4
).
image
(blend /
255
,
"
Alpha blend
"
);
wnd
(
1
,
4
).
image
(bdry /
255
,
"
Boundary extraction
"
);
wnd.
show
();
}
}
catch
(af::exception &e) {
fprintf
(stderr,
"
%s
\n
"
, e.
what
());
throw
;
}
return
0
;
}
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