Question

我可能会在我的编程风格上使用一些指针（最近在OpenCV / C ++中自学），但手头的问题与我的裁剪程序中的绘图有关。

我单击图像中的一个点，它绘制一个矩形，然后我可以调整矩形的大小并点击“z”来裁剪并将图像保存在目标文件夹中。但每当我点击程序中的任何地方时，它会绘制一个新的矩形但保留最近的前一个矩形。所以我总是不断绘制2个矩形。我想这可能与setMousecallback的工作方式有关，但我不确定。打击是我的代码

#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

只需在while循环和put之外声明并初始化int waitKeyVar = 0; 在waitKeyVar = waitKey(10);之后将imshow(tempstr, img);放在底部。

最后一个矩形可能会出现，因为您正在显示图像并将waitKey放在不同的位置。

裁剪程序每个循环openCV

1 个答案: