JavaCV内存不足，分配内存失败

Question

我正在使用 JavaCV 开发一个 OMR（光学标记识别）应用程序，java OpenCV.The 应用程序的接口可以很好地处理 200 张图像，但之后它无法为我的 code.The 当我尝试克隆 imgx 并将其分配给 imgxc1.Can 时出现分配错误，请您提出一个程序化修复建议？增加堆大小似乎是一个临时解决方案？

这里是初始化代码（出现异常的地方）：

protected boolean init () throws UnableToLoadImage{
    imgx = new IplImage();
    imgxc1 = new IplImage();
    imgxd1 = new IplImage();
    imgx = cvLoadImage(path+DR+filename);
    if(imgx == null)throw new UnableToLoadImage(path+DR+filename);
    //cvSaveImage("debug/"+filename, imgx);
    imgxc1 = cvCreateImage(cvGetSize(imgx), imgx.depth(), imgx.nChannels());
    imgxc1 = imgx.clone();//error comes here
    imgxd1 = cvCreateImage(cvGetSize(imgx), IPL_DEPTH_8U, 1);
    cvCvtColor(imgxc1, imgxd1, CV_BGR2GRAY);
    return (imgx != null && imgxc1 != null && imgxd1 != null)?true:false;
}

清理代码如下：

public void release() {
    if(imgx != null){

        imgx.release();
        imgxc1.release();
        imgxd1.release();

        cvReleaseImage(imgx);
        cvReleaseImage(imgxc1);
        cvReleaseImage(imgxd1);
    }

}

堆栈跟踪：

OpenCV Error: Insufficient memory (Failed to allocate 6454368 bytes) in cv::OutOfMemoryError, file ..\..\..\..\opencv\modules\core\src\alloc.cpp, line 52

at org.bytedeco.javacpp.opencv_core.cvCloneImage(Native Method)
at org.bytedeco.javacpp.helper.opencv_core$AbstractIplImage.clone(opencv_core.java:1005)
at com.omr.app.OmrModel.init(OmrModel.java:200)
at com.omr.app.OmrController.doInBackground(OmrController.java:328)
at com.omr.app.OmrController.doInBackground(OmrController.java:1)
at javax.swing.SwingWorker.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at javax.swing.SwingWorker.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Answer 1

您的代码看起来很奇怪。您将 IplImage 对象分配给您的变量，只是为了立即覆盖它们。在以下情况下，您还至少泄漏了一个可能的本机资源：

imgxc1 = cvCreateImage(cvGetSize(imgx), imgx.depth(), imgx.nChannels());
imgxc1 = imgx.clone();//error comes here

使用 cvCreateImage 创建的原始 imgxc1 对象已不再引用它，但您没有释放资源。

如果您不清楚 Java 中的引用是如何工作的，我建议您在继续您的工作之前做一些工作。您将摆脱多余的双重赋值行，代码也会更加清晰。

编辑：既然我已经在这上面浪费了时间，让我们逐行init()。

protected boolean init () throws UnableToLoadImage{
    imgx = new IplImage();    // Create a new IplImage() even though we won't use it

    imgxc1 = new IplImage();  // Same here. Just food for the garbage collector

    imgxd1 = new IplImage();  // Third completely unnecessary object creation

    imgx = cvLoadImage(path+DR+filename);  // Load an image, the previously created object in imgx is now GC food

    if(imgx == null)throw new UnableToLoadImage(path+DR+filename);
    //cvSaveImage("debug/"+filename, imgx);

    imgxc1 = cvCreateImage(cvGetSize(imgx), imgx.depth(), imgx.nChannels());  // Create an image with native resources, previous object is GC food

    imgxc1 = imgx.clone();    // Third time assignment to imgxc1, previous object isn't GC food since it holds native resources
    imgxd1 = cvCreateImage(cvGetSize(imgx), IPL_DEPTH_8U, 1);  // The first proper use of cvCreateImage
    cvCvtColor(imgxc1, imgxd1, CV_BGR2GRAY);  // Presumably ok
    return (imgx != null && imgxc1 != null && imgxd1 != null)?true:false;  // Doesn't need the ternary operator at all
}

该代码显示了对 Java 的巨大误解，但如果没有涉及本机资源，它只会导致一些额外的对象创建，然后由垃圾收集器处理。

JavaCV内存不足，分配内存失败

JavaCV Insufficient memory, failed to allocate memory

java

opencv

javacv

optical-mark-recognition