OpenCV Error: Assertion failed (size.width>0 &&size.height>0) 简单代码

2021-12-10 00:00:00 opencv c++

我正在尝试运行这个简单的 OpenCV 程序，但出现此错误:

I am trying to run this simple OpenCV program, but i got this error: 

OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file .../opencv/modules/highgui/src/window.cpp, line 276

代码:

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

using namespace std;

int main()
{
    cout << "Hello World!" << endl;

    cv::Mat inputImage = cv::imread("/home/beniz1.jpg");
    cv::imshow("Display Image", inputImage);

    return 0;
}

这个错误的原因是什么?

What's the cause of this error?

推荐答案

此错误表示您正在尝试显示空图像.当你用imshow加载图片时，这通常是由于:

This error means that you are trying to show an empty image. When you load the image with imshow, this is usually caused by:

  1. 你的图片路径错误(在 Windows 中转义两次目录分隔符，例如 imread("C:path oimage.png") 应该是:imread("C:\path\to\image.png") 或 imread("C:/path/to/image.png"));
  2. 图片扩展名错误.(例如.jpg"不同于.jpeg")；
  3. 您无权访问该文件夹.

排除其他问题的一个简单解决方法是将图像放在您的项目目录中，然后简单地将文件名 (imread("image.png") 传递给 imread).

A simple workaround to exclude other problems is to put the image in your project dir, and simply pass to imread the filename (imread("image.png")).

记得加上waitKey();，否则什么都看不到.

Remember to add waitKey();, otherwise you won't see anything.

您可以检查图像是否已正确加载，例如:

You can check if an image has been loaded correctly like:

#include <opencv2opencv.hpp>
#include <iostream>
using namespace cv;

int main()
{
    Mat3b img = imread("path_to_image");

    if (!img.data)
    {
        std::cout << "Image not loaded";
        return -1;
    }

    imshow("img", img);
    waitKey();
    return 0;
}

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