c++ - OpenCV 在实时相机提要中改变颜色

Question

我正在使用 openCV 2.4.9。我在新窗口中使用 OpenCV run camera 打开相机。我想通过按键更改相机提要的颜色。例如，当我单击“1”时，相机馈送更改为灰度，“2”-> 黑白，“3”-> HSV，当我按“ESC”返回 (0) 时。到目前为止，这是我想出的:

#include <iostream>
#include <conio.h>
using namespace std;

#include<opencv\cv.h>
#include<opencv\highgui.h>
#include "opencv2\core\core.hpp"
#include "opencv2\imgproc\imgproc.hpp"


void main(){

  CvCapture *capture = cvCaptureFromCAM(CV_CAP_ANY);
  IplImage *frame = 0, *image = 0;
  int key = 0, last = 0;

  cvNamedWindow("WebCamera", CV_WINDOW_AUTOSIZE);

  while(key != 27)  {

          frame = cvQueryFrame(capture);
          image = cvCloneImage(frame);

        // i try to use swich and case for this but i can't get it work
        // when using cvtColor need to use Mat image but when use cvShowImage need IplImage 
        //  switch(last)
        //  {
        //      case '1': 
        //           cvtColor(image,HSVimage,CV_BGR2HSV);
        //      case '2': 
        //           cvtColor(image,HSVimage,CV_BGR2GRAY);
        //      case '3': 
        //           . 
        //           .
        //      default: break;
        //  }


          cvShowImage("WebCamera", image);
          cvReleaseImage(&image);
          key = cvWaitKey(1);
          if (key != -1) last = key;
  }
  cvDestroyWindow("WebCamera");
  cvReleaseCapture(&capture);

  exit(0);
}

我想在同一窗口中一次又一次地更改颜色，或者(如果不可能)为每个滤色器打开和关闭窗口。谢谢。对不起英语不好

Answer 1

它应该与下面的代码一起工作。从 this 得到的OpenCV 教程和来自 OpenCV documentation .

#include "opencv2/opencv.hpp"
#include <iostream>

using namespace cv;
using namespace std;

int main()
{
    int key = 0, last = 0;
    VideoCapture cap(0); // open the default camera
    if(!cap.isOpened()) // check if we camera is opened
    { 
        cout << "Cannot open selected camera" << endl;
        return -1;   
    } 
    namedWindow("Capture",1);
    Mat convertedImage;

    for(;;) //Loop until user hit "esc"
    {
        Mat frame;
        cap >> frame; // get a new frame from camera            

        switch(last)
        {
           case '1':
           { 
               cvtColor(frame,convertedImage,CV_BGR2GRAY);
               break;
           }
          case '2': //Binarization to generate Black/White image
          {
               Mat img_gray;
               cvtColor(frame,img_gray,CV_BGR2GRAY); //First convert to gray
               //Binarization. Use your parameters here or try adaptiveThreshold
               threshold(img_gray, convertedIamge, 0, 255, CV_THRESH_BINARY | CV_THRESH_OTSU); 
          }
          case '3': 
          {  
              cvtColor(frame,convertedImage,CV_BGR2HSV);
              break;
          }
          default: //use to prevent ecxeption at program start or use case '0' to show original image
          {
                  convertedImage = frame;
          }
        }

        imshow("Capture", convertedImage); //show converted image

        key = waitKey(1);
        if (key != -1)             
            last = key;  

        if(key == 27)
          break;            

        // the camera will be deinitialized automatically in VideoCapture destructor
    }
    return 0;
}