double threshold( InputArray src, OutputArray dst,
                  double thresh, double maxval, int type );

void adaptiveThreshold( InputArray src, OutputArray dst,
                                     double maxValue, int adaptiveMethod,
                                     int thresholdType, int blockSize, double C );

 1 #include<opencv2/opencv.hpp>
 2 #include<iostream>
 3 
 4 using namespace cv;
 5 using namespace std;
 6 
 7 #define WINDOW_NAME "【程序窗口】"
 8 
 9 int g_nThresholdValue = http://www.mamicode.com/100;
10 int g_nThresholdType = 3;
11 Mat g_srcImage, g_grayImage, g_dstImage;
12 
13 void on_Threshold(int, void *);
14 
15 int main(int argc, char** argv) {
16     g_srcImage = imread("C:\\Users\\Nelsoner\\Desktop\\Camera Roll\\05.jpg");
17 
18     //存留一份源图的灰度图
19     cvtColor(g_srcImage, g_grayImage, COLOR_RGB2GRAY);
20         
21     namedWindow(WINDOW_NAME);
22     imshow(WINDOW_NAME, g_srcImage);
23 
24     createTrackbar("模式", WINDOW_NAME, &g_nThresholdType, 4, on_Threshold);
25     createTrackbar("参数值", WINDOW_NAME, &g_nThresholdValue, 255, on_Threshold);
26     on_Threshold(0, 0);
27 
28     waitKey(0);
29     return 0;
30 }
31 
32 void on_Threshold(int, void *) {
33     threshold(g_grayImage, g_dstImage, g_nThresholdValue, 255, g_nThresholdType);
34     imshow(WINDOW_NAME, g_dstImage);
35 }