gistfile1.cpp

#include <string>
#include "image_loader.h"
#include <cv.h>
#include <highgui.h>

/**
 * constructs a box filter. a matrix with all 1s and is normalized.
 * @param size of box filter as an int.
 */
void makeBoxFilter( CvMat * mat, int w )
{
	double one_over_w_squared = 1.0 / ( w * w );
	double data[w][w];

	// initialize data array
	for( int i = 0; i < w; i++ )
	{
		for( int j = 0; j < w; j++ )
		{
			//data[i][j] = one_over_w_squared;
			data[i][j] = 1.0;
		}
	}

	cvInitMatHeader( mat, w, w, CV_64FC1, data );
}

int main( int argc, char * argv[] )
{
	// load image
	std::string filename = "cameraman.tif";
	ImageLoader original_image( filename );
	IplImage * grayscale_image = cvCreateImage( cvSize( original_image.image->width, original_image.image->height ), IPL_DEPTH_8U, 1 );
	IplImage * box_filtered_image = cvCreateImage( cvSize( original_image.image->width, original_image.image->height ), IPL_DEPTH_8U, 1 );
	CvMat * box_filter = new CvMat();
	makeBoxFilter( box_filter, 3 );

	// Convert image to grayscale
	cvCvtColor( original_image.image, grayscale_image, CV_BGR2GRAY );
	cvFilter2D( grayscale_image, box_filtered_image, box_filter );

	// create window
	cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );
	cvShowImage( "mainWin", box_filtered_image );

	cvWaitKey( 0 );

	cvReleaseImage( &grayscale_image );
	return 0;
}