咱们先上代码

#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>
using namespace cv;
using namespace std;

int main()
{
	VideoCapture cap(0);
	Mat img;
	Mat imgHSV, mask, imgColor;
	int hmin = 0, smin = 0, vmin = 0;
	int hmax = 179, smax = 255, vmax = 255;

	namedWindow("Trackbars", (640, 200)); // Create Window
	createTrackbar("Hue Min", "Trackbars", &hmin, 179);
	createTrackbar("Hue Max", "Trackbars", &hmax, 179);
	createTrackbar("Sat Min", "Trackbars", &smin, 255);
	createTrackbar("Sat Max", "Trackbars", &smax, 255);
	createTrackbar("Val Min", "Trackbars", &vmin, 255);
	createTrackbar("Val Max", "Trackbars", &vmax, 255);

	while (true) {

		cap.read(img);
		cvtColor(img, imgHSV, COLOR_BGR2HSV);

		Scalar lower(hmin, smin, vmin);
		Scalar upper(hmax, smax, vmax);

		inRange(imgHSV, lower, upper, mask);
		// hmin, smin, vmin, hmax, smax, vmax;
		cout << hmin << ", " << smin << ", " << vmin << ", " << hmax << ", " << smax << ", " << vmax << endl;
		imshow("Image", img);
		imshow("Mask", mask);
		waitKey(1);
	}
}

逐步讲解

VideoCapture cap(0);
	Mat img;
	Mat imgHSV, mask, imgColor;
	int hmin = 0, smin = 0, vmin = 0;
	int hmax = 179, smax = 255, vmax = 255;namedWindow("Trackbars", (640, 200)); // Create Window
	createTrackbar("Hue Min", "Trackbars", &hmin, 179);
	createTrackbar("Hue Max", "Trackbars", &hmax, 179);
	createTrackbar("Sat Min", "Trackbars", &smin, 255);
	createTrackbar("Sat Max", "Trackbars", &smax, 255);
	createTrackbar("Val Min", "Trackbars", &vmin,25);
	createTrackbar("Val Max", "Trackbars", &vmax, 255);

这部分是打开我们的摄像头VideoCapture cap(0);0是电脑自带的摄像头，1是外部摄像头。随后建立一个hsv调节窗口。为了确定我们颜色具体的hsv我们应该先查找一下对应颜色的hsv范围

之后我们便可以缩小我们的hsv范围，一以下是这调节hsv的界面

cap.read(img);
		cvtColor(img, imgHSV, COLOR_BGR2HSV);

		Scalar lower(hmin, smin, vmin);
		Scalar upper(hmax, smax, vmax);

		inRange(imgHSV, lower, upper, mask);
		// hmin, smin, vmin, hmax, smax, vmax;
		cout << hmin << ", " << smin << ", " << vmin << ", " << hmax << ", " << smax << ", " << vmax << endl;
		imshow("Image", img);
		imshow("Mask", mask);
		waitKey(1);

这边就是得到一个我们最后得到颜色的hsv以及我们最后的一个效果图。下面就用一个红色物体来测试一下我们的代码。