1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/********************************
Author: Sravanthi Kota Venkata
********************************/
#include "sdvbs_common.h"
F2D* calcSobel_dY(F2D* imageIn)
{
int rows, cols;
I2D *kernel_1, *kernel_2;
float temp;
int kernelSize, startCol, endCol, halfKernel, startRow, endRow, i, j, kernelSum;
int k, kernelSum_2, outputRows, outputCols;
F2D *imageOut, *tempOut;
float kernelSum_1;
rows = imageIn->height;
cols = imageIn->width;
// level 1 is the base image.
outputRows = rows;
outputCols = cols;
imageOut = fSetArray(outputRows, outputCols, 0);
tempOut = fSetArray(outputRows, outputCols, 0);
kernel_1 = iMallocHandle(1, 3);
kernel_2 = iMallocHandle(1, 3);
asubsref(kernel_1,0) = 1;
asubsref(kernel_1,1) = 0;
asubsref(kernel_1,2) = -1;
kernelSize = 3;
kernelSum_1 = 2.0;
asubsref(kernel_2,0) = 1;
asubsref(kernel_2,1) = 2;
asubsref(kernel_2,2) = 1;
kernelSum_2 = 4;
startCol = 1;
endCol = cols - 1;
halfKernel = 1;
startRow = 1;
endRow = rows - 1;
for(i=startRow; i<endRow; i++)
{
for(j=startCol; j<endCol; j++)
{
temp = 0;
for(k=-halfKernel; k<=halfKernel; k++)
{
temp += subsref(imageIn,(i+k),j) * asubsref(kernel_1,k+halfKernel);
}
subsref(tempOut,i,j) = temp/kernelSum_1;
}
}
for(i=startRow; i<endRow; i++)
{
for(j=startCol; j<endCol; j++)
{
temp = 0;
for(k=-halfKernel; k<=halfKernel; k++)
{
temp += subsref(tempOut,i,j+k) * asubsref(kernel_2,k+halfKernel);
}
subsref(imageOut,i,j) = temp/(float)kernelSum_2;
}
}
fFreeHandle(tempOut);
iFreeHandle(kernel_1);
iFreeHandle(kernel_2);
return imageOut;
}
|
