OpenCV之阈值化

#include 
#include 
#include 
#include 
#include 
#include 
 
using namespace cv;
using namespace std;

#define WINDOW_NAME "[程序窗口]" // 窗口标题定义的宏

//全局变量
int g_nThresholdValue = 100;
int g_nThresholdType = 3;
Mat g_srcImage, g_grayImage, g_dstImage;

//全局函数
void on_Threshold(int, void*); //回调函数

int main(int argc, char** argv)
{
	//1.读入源图片
	g_srcImage = imread("700levi.jpg");

	//2.存留一份原图的灰度图
	cvtColor(g_srcImage, g_grayImage, COLOR_RGB2GRAY);

	//3.创建窗口并显示原图
	namedWindow(WINDOW_NAME, WINDOW_AUTOSIZE);

	//4.创建滑动条来控制阈值
	createTrackbar("模式", WINDOW_NAME, &g_nThresholdType, 4, on_Threshold);
	createTrackbar("参数值", WINDOW_NAME, &g_nThresholdValue, 255, on_Threshold);

	//5.初始化自定义的阈值回调函数
	on_Threshold(0, 0);

	//6.轮询等待用户按键, 如果esc按下, 则退出程序
	while (1)
	{
		int key;
		key = waitKey(20);
		if ((char)key == 27) { break; }
	}

	waitKey(0);
	return 0;
}

void on_Threshold(int, void*) {
	//调用回调函数
	threshold(g_grayImage, g_dstImage, g_nThresholdValue, 255, g_nThresholdType);
	//更新效果图
	imshow(WINDOW_NAME, g_dstImage);
}