OpenCV cvNamedWindow 未出现在 Fedora 下

发布于 2024-08-14 23:03:59 字数 437 浏览 8 评论 0原文

正如标题所示，我只是想打开一个命名窗口。我使用 OpenCV 已经一年多了，以前从未遇到过这个问题。由于某种原因，窗口永远不会打开。我尝试运行一些旧脚本，一切正常。

作为一个非常精简的示例，请参见下面，

#include "cv.h"
#include "highgui.h"

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

    cvNamedWindow( "video", 0 );
    IplImage *im = cvCreateImage( cvSize(200,200), 8, 3 );
    while(1) {
        cvShowImage( "video", im );
    }

    return 0;
}

我看不出为什么这不起作用，但由于某种原因，窗口永远不会出现。还有其他人经历过吗？它让我头疼！

原文

As the title suggests I'm simply trying to get a named window to come up. I've been working with OpenCV for over a year now, and never had this problem before. For some reason, the window never opens. I've tried running some of my old scripts and everything works fine.

As a very cut down example, see below

#include "cv.h"
#include "highgui.h"

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

    cvNamedWindow( "video", 0 );
    IplImage *im = cvCreateImage( cvSize(200,200), 8, 3 );
    while(1) {
        cvShowImage( "video", im );
    }

    return 0;
}

I can see no reason why that wouldn't work, but for some reason the window never appears.
Has anyone else experienced this? It's doing my head in!

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痴意少年 2024-08-21 23:03:59

只需在循环中调用 cvWaitKey(int milliseconds) 即可。该函数通知GUI系统运行图形待处理事件。
你的代码应该是这样的：

int main(int argc, char** argv) {
   cvNamedWindow( "video", 0 );
   IplImage *im = cvCreateImage( cvSize(200,200), 8, 3 );
   while(1) {
       cvShowImage( "video", im );
       cvWaitKey(100); //wait for 100 ms for user to hit some key in the window
   }

   return 0;
}

Simply call cvWaitKey(int milliseconds) within the loop. This function notifies the GUI system to run graphics pending events.
Your code should be something like:

int main(int argc, char** argv) {
   cvNamedWindow( "video", 0 );
   IplImage *im = cvCreateImage( cvSize(200,200), 8, 3 );
   while(1) {
       cvShowImage( "video", im );
       cvWaitKey(100); //wait for 100 ms for user to hit some key in the window
   }

   return 0;
}

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