opencv11_基本阈值操作

#include <stdio.h>
#include "math.h"

using namespace cv;
Mat src, dst, gray;

int threshold_value = 127;
int threshold_max = 255;
String s[] = { "input", "output" };
int type_value = 2;
int type_max = 4;

void (int, void*);
int main(int argc, char** argv) {

	src = imread("D:/documents/pictures/test.jpg");
	if (!src.data) {
		printf("could not openn");
		return -1;
	}

	namedWindow(s[0], CV_WINDOW_AUTOSIZE);
	namedWindow(s[1], CV_WINDOW_AUTOSIZE);
	imshow(s[0], src);
	
	createTrackbar("threshold value", s[1], &threshold_value, threshold_max, threshold_demo);
	createTrackbar("type value", s[1], &type_value, type_max, threshold_demo);
	threshold_demo(0, 0);

	waitKey(0);
	return 0;
 }

void (int, void*) {
	cvtColor(src, gray, CV_BGR2GRAY);
	
	//THRESH_BINARY_INV 1
	//THRESH_TRUNC 2
	//THRESH_ZERO 3
	//THRESH_ZERO_INV 4
	
	threshold(gray, dst,threshold_value, threshold_max, type_value);
	//threshold(gray, dst, 0, 255, THRESH_OTSU | type_value);//自动计算阈值
	//threshold(gray, dst, 0, 255, THRESH_TRIANGLE | type_value);//三角形法计算阈值
	
	imshow(s[1], dst);
}