From f618466c25d43f3bae9e40920273bf77de1e1149 Mon Sep 17 00:00:00 2001
From: leochanj105 <leochanj@live.unc.edu>
Date: Mon, 19 Oct 2020 23:09:30 -0400
Subject: initial sd-vbs

initial sd-vbs

add sd-vbs

sd-vbs
---
 SD-VBS/common/c/calcSobel_dX.c | 77 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 SD-VBS/common/c/calcSobel_dX.c

(limited to 'SD-VBS/common/c/calcSobel_dX.c')

diff --git a/SD-VBS/common/c/calcSobel_dX.c b/SD-VBS/common/c/calcSobel_dX.c
new file mode 100644
index 0000000..4be5845
--- /dev/null
+++ b/SD-VBS/common/c/calcSobel_dX.c
@@ -0,0 +1,77 @@
+/********************************
+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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