学习c++版opencv3.4之15-基本阈值操作

图像阈值,阈值类型。

阈值二值化。

#include 
#include 
#include 

using namespace std;
using namespace cv;

int threshold_value = 100;
int threshold_max = 255;
string outwindow = "threshold img";
Mat src, dst;
void mythreshold(int, void*);
int main(){
    src = imread("/Users/ming/Documents/test.jpg");
    if (!src.data){
        printf("cannot load image ...");
        return -1;
    }
    namedWindow("src img", CV_WINDOW_AUTOSIZE);
    imshow("src img", src);
    
    namedWindow(outwindow, CV_WINDOW_AUTOSIZE);
    createTrackbar("thershold value:", outwindow, &threshold_value, threshold_max, mythreshold); //创建滑动拖动条.第一个为拖动按钮的名字,第二个为显示窗口的名字,threshold_value为动态调整的变量,threshold_max为变量最大值,mythreshold为回掉函数
    mythreshold(0, 0);
    
    waitKey(0);
    return 0;
}

void mythreshold(int, void*){
    cvtColor(src, dst, CV_BGR2GRAY);
    cout<<"threshold_value: "<

创建两个拖动按钮,动态调节阈值和二值化方式。

#include 
#include 
#include 

using namespace std;
using namespace cv;

int threshold_value = 100, threshold_max = 255;
int threshold_type = 0, threshold_type_max = 4;
string outwindow = "threshold img";
Mat src, dst;
void mythreshold(int, void*);
int main(){
    src = imread("/Users/ming/Documents/test.jpg");
    if (!src.data){
        printf("cannot load image ...");
        return -1;
    }
    namedWindow("src img", CV_WINDOW_AUTOSIZE);
    imshow("src img", src);
    
    namedWindow(outwindow, CV_WINDOW_AUTOSIZE);
    /* 创建两个拖动按钮 */
    createTrackbar("thershold value:", outwindow, &threshold_value, threshold_max, mythreshold); //创建滑动拖动条.第一个为拖动按钮的名字,第二个为显示窗口的名字,threshold_value为动态调整的变量,threshold_max为变量最大值,mythreshold为回掉函数
    createTrackbar("threshold type:", outwindow, &threshold_type, threshold_type_max, mythreshold);
    mythreshold(0, 0);
    
    waitKey(0);
    return 0;
}

void mythreshold(int, void*){
    cvtColor(src, dst, CV_BGR2GRAY);
    cout << "threshold_type: " << threshold_type << endl;
    cout << "threshold_value: " << threshold_value << endl;
    threshold(dst, dst, threshold_value, threshold_max, threshold_type);
    imshow(outwindow, dst);
    return;
}

学习c++版opencv3.4之15-基本阈值操作_第1张图片

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