使用OpenCV读取文件夹中的有序序列的图像 [英] Reading an ordered sequence of images in a folder using OpenCV

问题描述

我有以下示例代码，其中显示我的网络摄像头。

I have this following example code, where I'm displaying my webcam.

但是如何在一个文件夹中显示一系列图片：

But how can I display a sequence of pictures in a folder like:

0.jpg 
1.jpg 
2.jpg
... and so on 

使用 imread ？

我想使用该文件夹作为输入，而不是我的网络摄像头。

I would like to use that folder as input instead of my webcam.

#include <iostream>    
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

int main()
{
    cv::VideoCapture capture(0);

    cv::Mat myImage;
    while(1)
    {
        capture>> myImage;

        cv::imshow( "HEYO", myImage);
        int c = cv::waitKey(1);

    }
    return 0;
}

推荐答案

code> VideoCapture 和 filename ：

1) You can use VideoCapture with a filename:

filename - 打开的视频文件（例如video.avi）或图像序列的名称strong> img_％02d.jpg ，会读取像img_00.jpg，img_01.jpg，img_02.jpg，...）的样本

filename – name of the opened video file (eg. video.avi) or image sequence (eg. img_%02d.jpg, which will read samples like img_00.jpg, img_01.jpg, img_02.jpg, ...)

2）或者只是更改要根据计数器加载的图像的名称。

2) Or simply change the name of the image to load according to a counter.

#include <opencv2/opencv.hpp>
#include <string>
#include <iomanip>
#include <sstream>

int main()
{
    std::string folder = "your_folder_with_images";
    std::string suffix = ".jpg";
    int counter = 0;

    cv::Mat myImage;

    while (1)
    {
        std::stringstream ss;
        ss << std::setw(4) << std::setfill('0') << counter; // 0000, 0001, 0002, etc...
        std::string number = ss.str();

        std::string name = folder + number + suffix;
        myImage = cv::imread(name);

        cv::imshow("HEYO", myImage);
        int c = cv::waitKey(1);

        counter++;
    }
    return 0;
}

3）也可以使用函数 glob 来存储与向量中给定模式匹配的所有文件名，以及然后扫描向量。这也将用于非连续数字。

3) Or you can use the function glob to store all the filenames matching a given pattern in a vector, and then scan the vector. This will work also for non-consecutive numbers.

#include <opencv2/opencv.hpp>
using namespace cv;

int main()
{
    String folder = "your_folder_with_images/*.jpg";
    vector<String> filenames;

    glob(folder, filenames);

    Mat myImage;

    for (size_t i = 0; i < filenames.size(); ++i)
    {
        myImage = imread(filenames[i]);
        imshow("HEYO", myImage);
        int c = cv::waitKey(1);
    }

    return 0;
}

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