裁剪程序在每個循環中繪製兩個矩形openCV

Question

我大概可以在我的編程風格上使用一些指針（最近在OpenCV/C++中自學），但手頭的問題與我的裁剪程序中的繪圖有關。

我點擊圖像上的一個點，它繪製一個矩形，然後我可以調整矩形大小並點擊「z」裁剪並將圖像保存到目標文件夾中。但是每當我點擊程序中的任何地方時，它會繪製一個新的矩形，但保留最近一次的矩形。所以我總是有兩個矩形。我認爲這可能與setMousecallback的工作方式有關，但我不確定。打擊是我的代碼

#include "opencv2/opencv.hpp" 
#include <iostream> 
#include <string> 
#include <stdio.h> 
#include <fstream> 

using namespace cv; 
using namespace std; 

Mat img; 
string * strPtr; 
int width, height; 

void matResize(Mat& img){ 
    if(width > 600 && height > 600){ 
     int scale = width/600; 
     width = width/scale; 
     height = height/scale; 
     resize(img, img, Size(width, height)); 
    } 
} 

void onMouse(int evt, int x, int y, int flags, void* param) { 
    if(evt == CV_EVENT_LBUTTONDOWN) { 
     img = imread(*strPtr); 
     transpose(img,img); 
     flip(img, img, 1); 
     width = img.cols; 
     height = img.rows; 
     matResize(img); 

     Point* ptPtr = (Point*)param; 
     ptPtr->x = x; 
     ptPtr->y = y; 
    } 
} 

int main(int argc, char* argv[]) 
{ 

    ifstream file("/home/willem/Desktop/Training/ThumbsUp/img4resize/files.txt"); 
    //Read each file location into a vector array 
    string str; 
    vector<string> fileLocations; 
    while (getline(file, str)){ 
     fileLocations.push_back(str); 
    } 

    //Loop to process each Image 
    for(int i = 0; i < fileLocations.size(); ++i){ 
     //Square Properties 
     Point2i pt(0,0); 
     int X, Y; 
     int hlen = 0; 
     Rect rect; 

     //Image name and rotation 
     int found = fileLocations[i].find_last_of("/"); 
     int len = fileLocations[i].length(); 
     string tempstr = fileLocations[i].substr(found+1,len-1); 
     namedWindow(tempstr); 
     img = imread(fileLocations[i]); 
     transpose(img,img); 
     flip(img, img, 1); 
     strPtr = &fileLocations[i]; 

     //resize to scale 
     width = img.cols; 
     height = img.rows; 
     matResize(img); 

     //Mouse Properties 
     setMouseCallback(tempstr, onMouse, (void*)&pt); 

     //Image update loop 
     while(1){ 

      //Update MouseClick Position 
      X = pt.x; 
      Y = pt.y; 

      //Set square properties 
      if(X == 0){ 
       if(height > width) 
        hlen = (int)(height*(1.0/3)); 
       else 
        hlen = (int)(width*(1.0/3)); 

       rect = Rect(X-hlen,Y-hlen,2*hlen,2*hlen); 
      } 

      int waitKeyVar = waitKey(10); 
      if(waitKeyVar % 255 == 129 || waitKeyVar == 133){ 
       //"q" 
       //Skip image 
       destroyWindow(tempstr); 
       break; 
      } 
      cout << waitKeyVar % 255 << endl; 
      if(waitKeyVar == 119 || waitKeyVar % 255 == 135){ 
       //"w" 
       //Resize rect -5% 
       hlen = hlen*0.95; 
      } 
      if(waitKeyVar == 101 || waitKeyVar % 255 == 117){ 
       //"e" 
       //resize rect +5% 
       hlen = hlen*1.05; 
      } 

      if(waitKeyVar == 122 || waitKeyVar % 255 == 138){ 
       //"z" 
       //crop and save image 
       Mat cropped = img(Rect(X-hlen,Y-hlen, 2*hlen, 2*hlen)); 
       string destination = "/home/willem/Desktop/AdMobilize/Training/ThumbsUp/New Positives/";    //Configure output here 
       string final = destination + tempstr; 
       imwrite(final, cropped); 
       destroyWindow(tempstr); 
       break; 
      } 

      //draw Rectangle 
      rectangle(img, Rect(X-hlen,Y-hlen, 2*hlen, 2*hlen), Scalar(255,255,255), 2,8,0); 

      //display Image 
      imshow(tempstr, img); 
     } 

    } 

    return 0; 
} 

Answer 1

聲明並初始化INT waitKeyVar = 0; while循環之外，並把 把waitKeyVar = waitKey(10);底部imshow(tempstr, img);後。

最後一個矩形可能會出現，因爲您正在顯示圖像並將waitKey置於不同的位置。