OpenCV Sobel edge detector

http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/sobel_derivatives/sobel_derivatives.html

Orignal

Sobel X Gradient

Sobel Y Gradient

Sobel Gradient

	#include <iostream>
	#include <stdio.h>
	#include <stdlib.h>
	#include "opencv2/highgui/highgui.hpp"
	#include "opencv2/imgproc/imgproc.hpp"
	#include "opencv2/core/core.hpp"
	using namespace std;
	using namespace cv;
	#include "Functions.h"
	int main()
	{
	Mat image;
	//image = imread("lena.jpg",1);
	image = imread("building.jpg",1);
	if(image.empty())
	{
	cout << "Could not open or find the image" << std::endl ;
	return -1;
	}
	/// Convert it to gray
	cvtColor( image, image, CV_RGB2GRAY );
	resize(image,image,Size(0,0),0.5,0.5,INTER_LINEAR);
	namedWindow("Image", CV_WINDOW_AUTOSIZE );
	imshow("Image", image);
	/// Generate grad_x and grad_y
	Mat grad_x, grad_y;
	Mat abs_grad_x, abs_grad_y;
	int scale = 1;
	int delta = 0;
	int ddepth = CV_16S;
	Mat grad;
	/// Gradient X
	//Scharr( image, grad_x, ddepth, 1, 0, scale, delta, BORDER_DEFAULT );
	Sobel( image, grad_x, ddepth, 1, 0, 3, scale, delta, BORDER_DEFAULT );
	convertScaleAbs( grad_x, abs_grad_x );
	/// Gradient Y
	// Scharr( image, grad_y, ddepth, 0, 1, scale, delta, BORDER_DEFAULT );
	Sobel( image, grad_y, ddepth, 0, 1, 3, scale, delta, BORDER_DEFAULT );
	convertScaleAbs( grad_y, abs_grad_y );
	/// Total Gradient (approximate)
	addWeighted( abs_grad_x, 0.5, abs_grad_y, 0.5, 0, grad );
	namedWindow("ImageSobel", CV_WINDOW_AUTOSIZE );
	imshow( "ImageSobel", grad );
	namedWindow("ImageSobelGx", CV_WINDOW_AUTOSIZE );
	imshow( "ImageSobelGx", abs_grad_x );
	namedWindow("ImageSobelGy", CV_WINDOW_AUTOSIZE );
	imshow( "ImageSobelGy", abs_grad_y );
	waitKey(0);
	return 0;
	}

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