使用openCV Mat c ++加载图像 [英] load image with openCV Mat c++

问题描述

我想在openCV中使用Mat加载图片

I want to load an image using Mat in openCV

我的代码是：

Mat I = imread("C:/images/apple.jpg", 0);
namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
imshow( "Display window", I ); 

我在一个消息框中收到以下错误：

I am getting the following error in a message box:

Unhandled exception at 0x70270149 in matching.exe: 0xC0000005: Access violation 
reading location 0xcccccccc.

请注意，我包括：

#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
#include <iostream>
#include <math.h>

请帮忙。谢谢。

推荐答案

我有已经谈过这个这么多次，我想这是没有意义，但再次，但代码防御：如果方法/函数调用失败，请确保知道发生的时间：

I've talked about this so many times before, I guess it's pointless to do it again, but code defensively: if a method/function call can fail, make sure you know when it happens:

Mat I = imread("C:\\images\\apple.jpg", 0);
if (I.empty())
{
    std::cout << "!!! Failed imread(): image not found" << std::endl;
    // don't let the execution continue, else imshow() will crash.
}

namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
imshow( "Display window", I ); 
waitKey(0);

请注意，Windows的路径使用反斜杠 \ 而不是在* nix系统上使用的标准 / 。您需要在传递文件名时转义反斜杠： C：\\images\\apple.jpg

Note that Windows' path uses backslash \ instead of the standard / used on *nix systems. You need to escape the backslash when passing the filename: C:\\images\\apple.jpg

如果使用 waitKey（）是必须的> imshow（）。

Calling waitKey() is mandatory if you use imshow().

EDIT ：

如果是 cv :: imread（）这是抛出异常我知道唯一的解决方案是下载OpenCV源并构建<强>在机器上，因为重新安装OpenCV不能解决这个问题。

If it's cv::imread() that is throwing the exception the only solution I know to work is downloading OpenCV sources and building it on the machine, since re-installing OpenCV doesn't fix the issue.

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