cvSobel

#include "stdafx.h"
#include <cv.h>
#include <highgui.h>
#include <cxcore.h>
#include <math.h>
using namespace cv;
int g_slider_position=0,high=0,low=0;
CvCapture* capture         = NULL;
void onTrackbarSlide(int pos) {}
//------------------------------------------
int main( int argc, char* argv[] ) {
    capture = cvCreateFileCapture( "C:\\Users\\abc\\Desktop\\MVI_0035.avi" );
    if(!capture){
        return -1;
    }
 CvSize size = cvSize(
       (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_WIDTH),
       (int)cvGetCaptureProperty( capture, CV_CAP_PROP_FRAME_HEIGHT)
    );
    IplImage* frame = cvCreateImage(size,IPL_DEPTH_8U,3);
    IplImage* grey = cvCreateImage(size,IPL_DEPTH_8U,1);
 IplImage* edge = cvCreateImage(size, IPL_DEPTH_8U, 1);
    IplImage* dirsx = cvCreateImage(size, IPL_DEPTH_16S, 1);
    IplImage* dirsy = cvCreateImage(size, IPL_DEPTH_16S, 1);
    IplImage* dirsxy = cvCreateImage(size, IPL_DEPTH_16S, 1);
    IplImage* dirx = cvCreateImage(size, IPL_DEPTH_8U, 1);
 IplImage* diry = cvCreateImage(size, IPL_DEPTH_8U, 1);
    IplImage* dirxy = cvCreateImage(size, IPL_DEPTH_8U, 1);
    while( (frame=cvQueryFrame(capture)) != NULL ) {
  cvCvtColor(frame,grey,CV_RGB2GRAY); 
  cvNamedWindow( "gray", CV_WINDOW_AUTOSIZE );
  cvNamedWindow( "canny", CV_WINDOW_AUTOSIZE );
  cvNamedWindow( "sobel", CV_WINDOW_AUTOSIZE );
  cvCreateTrackbar("T","gray",&g_slider_position,1000,onTrackbarSlide);
  cvCreateTrackbar("high","canny",&high,1000,onTrackbarSlide);
  cvCreateTrackbar("low","canny",&low,1000,onTrackbarSlide);
  cvSmooth(grey,grey,CV_GAUSSIAN,13);
  cvCanny(grey, edge, low, high);
  //-----------------------
  cvSobel(grey,dirsx,1,0, 3);
  cvConvertScaleAbs(dirsx,dirx,1,0);
  cvSobel(grey,dirsy,0,1, 3);
  cvConvertScaleAbs(dirsy,diry,1,0);
  cvAddWeighted(dirsx,0.707,dirsy,0.707,0,dirsxy);
     cvConvertScaleAbs(dirsxy,dirxy,1,0);
  //-------------------
  cvShowImage( "gray", grey );
  cvShowImage( "canny", edge );
  cvShowImage("sobel", dirxy);
  cvWaitKey(1001-g_slider_position);
    }
    cvReleaseImage( &frame );
 cvReleaseImage( &grey );
    cvReleaseCapture( &capture );
 cvDestroyWindow( "gray" );
 cvDestroyWindow( "canny" );
 cvDestroyWindow( "sobel" );
    return(0);
}