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diff --git a/sci_gateway/cpp/opencv_imboxfilt3.cpp b/sci_gateway/cpp/opencv_imboxfilt3.cpp
new file mode 100644
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--- /dev/null
+++ b/sci_gateway/cpp/opencv_imboxfilt3.cpp
@@ -0,0 +1,130 @@
+/***************************************************
+Author : Yash S. Bhalgat
+****************************************************
+Usage :
+	1) box_filtered_image = imboxfilt3(input_img);
+		In this usage, the default filter size of 3x3 is used.
+	
+	2) box_filtered_image = imboxfilt3(input_img, filter_height, filter_width);
+
+Example : 
+	img = imread("lena.jpg");
+	imshow(img);
+	box_filtered_img = imboxfilt3(img, 9, 9);
+	imshow(box_filtered_img);
+***************************************************/
+
+#include <numeric>
+#include "opencv2/core/core.hpp"
+#include "opencv2/highgui/highgui.hpp"
+#include "opencv2/opencv.hpp"
+#include <iostream>
+using namespace cv;
+using namespace std;
+extern "C"
+{
+  #include "api_scilab.h"
+  #include "Scierror.h"
+  #include "BOOL.h"
+  #include <localization.h>
+  #include <sciprint.h>
+  #include "../common.h"
+  
+  int opencv_imboxfilt3(char *fname, unsigned long fname_len)
+  {
+
+    SciErr sciErr;
+    int intErr = 0;
+    int iRows=0,iCols=0;
+    int *piAddr2  = NULL;
+    int *piAddr3  = NULL;
+    int i,j,k;
+	
+	//Default filter size
+	double filter_height = 3;
+	double filter_width = 3;
+
+    //checking input argument
+    CheckInputArgument(pvApiCtx, 1, 3);
+    CheckOutputArgument(pvApiCtx, 1, 1) ;
+	
+	int inputarg = *getNbInputArgument(pvApiCtx);
+	
+	
+    Mat image;
+    retrieveImage(image,1);
+	
+	
+	if(inputarg >= 2){
+		//for value of filter_height
+		sciErr = getVarAddressFromPosition(pvApiCtx,2,&piAddr2);
+		if (sciErr.iErr)
+		{
+			printError(&sciErr, 0);
+			return 0;
+		}
+		intErr = getScalarDouble(pvApiCtx, piAddr2, &filter_height);
+		if(intErr)
+			return intErr;
+
+		//for value of filter_width
+		sciErr = getVarAddressFromPosition(pvApiCtx,3,&piAddr3);
+		if (sciErr.iErr)
+		{
+			printError(&sciErr, 0);
+			return 0;
+		}
+		intErr = getScalarDouble(pvApiCtx, piAddr3, &filter_width);
+		if(intErr)
+			return intErr;
+	}
+
+
+    //taking the cases which can lead to an error
+    Mat filtered_image(image.rows,image.cols,image.type());
+    
+    if(filter_height<0)
+    {
+        sciprint("Positive Value Required for Height. 3 value was used instead");
+        filter_height=3;
+    }
+    if(filter_width<0)
+    {
+        sciprint("Positive Value Required for Width. 3 value was used instead");
+        filter_width=3;
+    }
+    if((int)filter_height%2==0)
+    {
+        filter_height+=1;
+        sciprint("Odd Value Required for Height. %f value was used instead",&filter_height);
+    }
+    if((int)filter_width%2==0)
+    {
+        filter_width+=1;
+        sciprint("Odd Value Required for Width. %f value was used instead",&filter_width);
+    }
+
+    //temporary size variable, to use in function
+    Size sz(filter_height,filter_width);
+
+    //opencv function called
+    //if both filter_size is not given, default value of 3x3 is used
+    boxFilter(image,filtered_image, -1, sz);
+
+    //returning image
+    string tempstring = type2str(filtered_image.type());
+    char *checker;
+    checker = (char *)malloc(tempstring.size() + 1);
+    memcpy(checker, tempstring.c_str(), tempstring.size() + 1);
+    returnImage(checker,filtered_image,1);
+    free(checker);
+
+    //Assigning the list as the Output Variable
+    AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1;
+    //Returning the Output Variables as arguments to the Scilab environment
+    ReturnArguments(pvApiCtx);
+    return 0;
+
+  }
+/* ==================================================================== */
+}