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/********************************
Author: Sravanthi Kota Venkata
********************************/
#include <stdio.h>
#include <stdlib.h>
#include "sdvbs_common.h"
F2D* calcSobel_dX(F2D* imageIn)
{
int rows, cols;
F2D *kernel_1, *kernel_2;
float temp;
int kernelSize, startCol, endCol, halfKernel, startRow, endRow, i, j, kernelSum;
int k, kernelSum_1, kernelSum_2;
F2D *imageOut, *tempOut;
rows = imageIn->height;
cols = imageIn->width;
imageOut = fSetArray(rows, cols, 0);
tempOut = fSetArray(rows, cols, 0);
kernel_1 = fMallocHandle(1, 3);
kernel_2 = fMallocHandle(1, 3);
asubsref(kernel_1,0) = 1;
asubsref(kernel_1,1) = 2;
asubsref(kernel_1,2) = 1;
kernelSize = 3;
kernelSum_1 = 4;
asubsref(kernel_2,0) = 1;
asubsref(kernel_2,1) = 0;
asubsref(kernel_2,2) = -1;
kernelSum_2 = 2;
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,j+k) * asubsref(kernel_2,k+halfKernel);
}
subsref(tempOut,i,j) = temp/kernelSum_2;
}
}
for(i=startRow; i<endRow; i++)
{
for(j=startCol; j<endCol; j++)
{
temp = 0;
for(k=-halfKernel; k<=halfKernel; k++)
{
temp += subsref(tempOut,(i+k),j) * asubsref(kernel_1,k+halfKernel);
}
subsref(imageOut,i,j) = temp/(float)kernelSum_1;
}
}
fFreeHandle(tempOut);
fFreeHandle(kernel_1);
fFreeHandle(kernel_2);
return imageOut;
}
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