Erosion,dilation and morphological operations

struct morphParameters{
	int shape;
	int size;
	int oper;
	Mat* src;
	Mat* res;
};
void morphology(Mat* src, Mat *result, int size)
{
	int choice;
	morphParameters dil, ero, morph;
	cout << "0: erosion,1:dilation,2:morph operation";
	cin >> choice;

	if (choice == 1)
	{
		namedWindow("Dilation", CV_WINDOW_AUTOSIZE);
		dil.src = src;
		dil.res = result;
		dil.shape = 0;
		dil.size = size;
		createTrackbar("0:rectangle 1:cross 2:ellipse", "Dilation", &(dil.shape), 2, Dilation, (void*)(&dil));
		createTrackbar("Size: 2n+1: Choose n", "Dilation", &dil.size, 21, Dilation, (void*)(&dil));
		Dilation(0, (void*)&dil);
	}
	else if (choice == 0)
	{

		namedWindow("Erosion", CV_WINDOW_AUTOSIZE);
		ero.res = result;
		ero.src = src;
		ero.shape = 0;
		ero.size = size;
		createTrackbar("0:rectangle 1:cross 2:ellipse", "Erosion", &(ero.shape), 2, Erosion, (void*)(&ero));
		createTrackbar("Size: 2n+1: Choose n", "Erosion", &ero.size, 21, Erosion, (void*)(&ero));
		Erosion(0, (void*)&ero);

	}
	else
	{
		namedWindow("Morphological", CV_WINDOW_AUTOSIZE);
		morph.res = result;
		morph.src = src;
		morph.shape = 0;
		morph.size = size;
		morph.oper = 0;
		createTrackbar("0:opening\n 1:closing \n2: gradient \n3:top hat 4: \nblack hat\n", "Morphological", &(morph.oper), 4, Morphological, (void*)(&morph));
		createTrackbar("Size: 2n+1: Choose n", "Morphological", &morph.size, 21, Morphological, (void*)(&morph));
		Morphological(0, (void*)&morph);
	}
	
	waitKey(0);


}

void Erosion(int ,void* input)
{
	morphParameters *data;
	data = (morphParameters*)input;
	printParam(*data);
	// We need to create a kernel of a particular size and shape
	Mat kernel;
	kernel = getStructuringElement(0, Size(2 * data->size + 1, 2 * data->size + 1), Point(data->size, data->size));
	erode(*data->src, *data->res, kernel);
	morphologyEx(*data->src, *data->res,data->shape, kernel);
	imshow("Erosion", *data->res);

}

void Dilation(int, void* input)
{
	
	morphParameters *data;
	data = (morphParameters*)input;
	printParam(*data);
	// We need to create a kernel of a particular size and shape
	Mat kernel;
	kernel = getStructuringElement(0, Size(2 * data->size + 1, 2 * data->size + 1), Point(data->size, data->size));
	dilate(*data->src, *data->res, kernel);
	imshow("Dilation", *data->res);
}

void Morphological(int, void* input)
{
	morphParameters *data;
	data = (morphParameters*)input;
	printParam(*data);
	// We need to create a kernel of a particular size and shape
	Mat kernel;
	kernel = getStructuringElement(0, Size(2 * data->size + 1, 2 * data->size + 1), Point(data->size, data->size));
	morphologyEx(*data->src, *data->res, data->oper , kernel);
	imshow("Morphological", *data->res);

}