Opencv learning notes -day8 (keyboard typing (waitkey()); Wait for typing) action: triggers some action when the appropriate character is typed using the keyboard)

day8- Keyboard response operation

function

waitKey(); Waiting for typing

When using the keyboard to type the appropriate characters Trigger certain actions

Code

quickopencv.h

#pragma once

#include <opencv2\highgui.hpp>

#include <opencv2\imgproc.hpp>

using namespace cv;
// Defining classes 
class QuickDemo{
    
public:
	void colorSpace_Demo(Mat &image);// Color space conversion function 2021-12-24
	void mat_creation_demo(Mat &image);//Mat Object and creation 2021-12-27
	void pixel_vist_Demo(Mat &image);// Read and write operation of image pixels 2022-1-3
	void operators_demo(Mat &image);// Arithmetic operation of image pixels 2022-1-4
	void tracking_bar_demo(Mat &image);// Scroll bar operation demonstration 2022-1-7
	void key_demo(Mat &image);// Keyboard response operation 2022-1-12
};

OpencvTest.cpp

#include <iostream>
#include <opencv2\highgui.hpp>
#include <opencv2\imgproc.hpp>
#include<quickopencv.h>

using namespace cv;
using namespace std;


int main()
{
    
	Mat scr = imread("D:\\ Study \\OpenCV Study \\pictures\\image\\1.jpg");// Open a picture 
	if (!scr.data == 1)// Sentenced to empty 
		return -1;
	namedWindow(" window 1", WINDOW_NORMAL);// establish  WINDOW_FREERATIO window 
	imshow(" window 1",scr);// Show in the created window 
	QuickDemo qd;
	qd.key_demo(scr);// Type action 
	waitKey(0);
	return 0;
}

#include <opencv2\highgui.hpp>

#include <opencv2\imgproc.hpp>

#include<quickopencv.h>

#include <iostream>
void QuickDemo::key_demo(Mat &image)
{
    
	Mat dst = Mat::zeros(image.size(), image.type());
	while (true)
	{
    
		int c = waitKey(100);
		if (c == 27)// Key in  ESC key   sign out 
		{
    
			break;
		}
		if (c == 49){
    // Key in  1  You can type 1 when   Add some features   For example, convert to grayscale image 
			//std::cout << "you enter key #1" << std::endl;
			cvtColor(image, dst, COLOR_BGR2GRAY);// Go gray 
		}
		if (c == 50){
    // Key in  2  turn hsv
			//std::cout << "you enter key #2" << std::endl;
			cvtColor(image, dst, COLOR_BGR2HSV);// turn hsv
		}
		if (c == 51){
    // Key in  3  adjust brightness 
			Mat m = Mat::zeros(image.size(), image.type());
			m = Scalar(50, 50, 50);
			add(image,m,dst);
			std::cout << "you enter key #3" << std::endl;
		}
		imshow(" Keyboard response ", dst);
	}//while

}

Show results

When no characters are typed

Key in 1 Convert to grayscale image

Key in 2 Convert to hsv Images

Key in 3 Pictures increase brightness

type ESC key sign out