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Editorial Team
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Asked: 2026-05-12T06:58:40+00:00

I’m trying to iterator over some directories containing approximately 3000 images. I load the

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I’m trying to iterator over some directories containing approximately 3000 images. I load the image. If the image is loaded I release it.
That is the smallest program that I can write to reproduce the error.

After loading and releasing 124 images the program stops loading images. I think this a memory issue but I don’t understand what exactly causes the program to stop loading images.

I’m using OpenCV on my Mac. I don’t know how exactly I can figure out which version I’m using.

Here is the Code from my project.

bool FaceDetectionStrategy::detectFace(std::string imagePath) {

   IplImage *img = cvLoadImage(imagePath.c_str(), CV_LOAD_IMAGE_COLOR);
   if (img) {
      std::cout << "Image loaded " << imagePath << std::endl;
      cvReleaseImage(&img);
   } else {
      std::cout << "Image not loaded " << imagePath << std::endl;
   }
return true;

}

This method is called for every image in the directorys I’m iterating through. After 124 images the if(img) part evaluates to false and the else branch is executed. If I try to load images from other parts of the program later on they also won’t load.

Edit it is not a memory issue. Mac Os standard max open files is 256 after changing it to 512 I can open 251 images. so it seems that OpenCV doesn’t closes the image files after loading them.

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1 Answer

  1. Editorial Team

    Searching the bugtracker from OpenCv showed this answer to the problem: cvLoadImage with Mac ImageIO leaves file handles open.

    It seems that this is a bug in the OpenCV mac implementation and the only way to solve it is to install a newer version of OpenCV.

    EDIT installing the last version of OpenCV from the repository trunk solves the problem. Sometimes it helps checking the BugTracker of the frameworks you are using…

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