c++ - Opencv圆检测-RAM加载

Question

我最近在 OpenCV 中做了一些圆检测，并取得了一些巨大的成功。下面的代码在 32 位平台上用 C++ 运行得非常好。但是我确实有一个小问题；当程序运行时，我的 RAM 负载会继续加载。例如，当我启动程序时，我的大小为 250mb，30 秒后我的大小约为 800mb。这将继续并最终溢出到硬盘驱动器。我试图将 cvReleaseCapture 移动到 while 循环内，但我只是得到旧的“内存位置异常......”。有什么想法可以清理吗？多谢。这是代码:

#include "stdafx.h"
#include <cv.h>
#include <highgui.h>
#include <math.h>


int main( int argc, char **argv )
{
    CvCapture *capture = 0;
    IplImage  *img = 0;
    int       key = 0;
CvFont font;
cvInitFont(&font, CV_FONT_HERSHEY_PLAIN,1.0,1.0,0,1,CV_AA);

capture = cvCaptureFromCAM( 0 );

if ( !capture ) {
    fprintf( stderr, "Cannot open initialize webcam!\n" );
    return 1;
} 

cvNamedWindow( "result", CV_WINDOW_AUTOSIZE );

while( key != 'q' ) {
    img = cvQueryFrame( capture ); 
    IplImage* gray = cvCreateImage( cvGetSize(img), 8, 1 );
    CvMemStorage* storage = cvCreateMemStorage(0);
    cvCvtColor( img, gray, CV_BGR2GRAY );
    cvSmooth( gray, gray, CV_GAUSSIAN, 9, 9 );
    CvSeq* circles = cvHoughCircles( gray, storage, CV_HOUGH_GRADIENT, 2, gray-    >height/4, 200, 100, 20, 100 );
    int i;
    for( i = 0; i < circles->total; i++ )
    {
         float* p = (float*)cvGetSeqElem( circles, i );
         //cvCircle( img, cvPoint(cvRound(p[0]),cvRound(p[1])), 2, CV_RGB(0,255,0), -1, 8, 0 );
         cvCircle( img, cvPoint(cvRound(p[0]),cvRound(p[1])), cvRound(p[2]), CV_RGB(0,255,0), 2, 8, 0 );
         cvLine (img, cvPoint(cvRound(p[0]+40),cvRound(p[1])), cvPoint(cvRound(p[0]),cvRound(p[1])), CV_RGB(0,255,0), 1, CV_AA,0);
         cvLine (img, cvPoint(cvRound(p[0]),cvRound(p[1]+40)), cvPoint(cvRound(p[0]),cvRound(p[1])), CV_RGB(0,255,0), 1, CV_AA,0);
         cvLine (img, cvPoint(cvRound(p[0]-40),cvRound(p[1])), cvPoint(cvRound(p[0]),cvRound(p[1])), CV_RGB(0,255,0), 1, CV_AA,0);
         cvLine (img, cvPoint(cvRound(p[0]),cvRound(p[1]-40)), cvPoint(cvRound(p[0]),cvRound(p[1])), CV_RGB(0,255,0), 1, CV_AA,0);
         cvPutText(img, "Meow",cvPoint(cvRound(p[0]+45),cvRound(p[1]+45)), &font, CV_RGB(0,0,255)); 

    }


    if( !img ) break;       
    cvShowImage( "result", img ); 
    key = cvWaitKey( 1 );
    cvReleaseCapture( &capture );
}

cvDestroyWindow( "result" );
cvReleaseCapture( &capture );    

return 0;

Answer 1

去掉 while 循环中的 cvReleaseCapture。相反，你应该有

cvReleaseMemStorage(storage);
cvReleaseImage(gray);

您可能应该移动 if (!img) break; 行使其显示为:

img = cvQueryFrame(capture);
if (!img) break;

编辑

实际上，与其不断创建然后销毁 gray，不如在 while 的 eof 之外进行初始捕获 (img = cvQueryFrame(capture);) 循环。然后按正常方式创建gray。这样您就不必在 while 循环中继续创建它，这就是内存不足的原因(您每次迭代都在创建新图像而不释放它)。

所以

#include "stdafx.h"
#include <cv.h>
#include <highgui.h>
#include <math.h>


int main( int argc, char **argv )
{
    CvCapture *capture = 0;
    IplImage  *img = 0;
    int       key = 0;
    CvFont font;
    cvInitFont(&font, CV_FONT_HERSHEY_PLAIN,1.0,1.0,0,1,CV_AA);

    capture = cvCaptureFromCAM( 0 );

    if ( !capture ) {
        fprintf( stderr, "Cannot open initialize webcam!\n" );
        return 1;
    } 

    cvNamedWindow( "result", CV_WINDOW_AUTOSIZE );

    img = cvQueryFrame( capture );
    if (!img) 
        exit(1);
    IplImage* gray = cvCreateImage( cvGetSize(img), 8, 1 );
    CvMemStorage* storage = cvCreateMemStorage(0);

    while( key != 'q' ) {
        img = cvQueryFrame( capture ); 
        if( !img ) break;  


        cvCvtColor( img, gray, CV_BGR2GRAY );
        cvSmooth( gray, gray, CV_GAUSSIAN, 9, 9 );
        CvSeq* circles = cvHoughCircles( gray, storage, CV_HOUGH_GRADIENT, 2, gray-        >height/4, 200, 100, 20, 100 );
        int i;
        for( i = 0; i < circles->total; i++ )
        {
            float* p = (float*)cvGetSeqElem( circles, i );
            //cvCircle( img, cvPoint(cvRound(p[0]),cvRound(p[1])), 2, CV_RGB(0,255,0), -1, 8, 0 );
            cvCircle( img, cvPoint(cvRound(p[0]),cvRound(p[1])), cvRound(p[2]), CV_RGB(0,255,0), 2, 8, 0 );
            cvLine (img, cvPoint(cvRound(p[0]+40),cvRound(p[1])), cvPoint(cvRound(p[0]),cvRound(p[1])), CV_RGB(0,255,0), 1, CV_AA,0);
            cvLine (img, cvPoint(cvRound(p[0]),cvRound(p[1]+40)), cvPoint(cvRound(p[0]),cvRound(p[1])), CV_RGB(0,255,0), 1, CV_AA,0);
            cvLine (img, cvPoint(cvRound(p[0]-40),cvRound(p[1])), cvPoint(cvRound(p[0]),cvRound(p[1])), CV_RGB(0,255,0), 1, CV_AA,0);
            cvLine (img, cvPoint(cvRound(p[0]),cvRound(p[1]-40)), cvPoint(cvRound(p[0]),cvRound(p[1])), CV_RGB(0,255,0), 1, CV_AA,0);
            cvPutText(img, "Meow",cvPoint(cvRound(p[0]+45),cvRound(p[1]+45)), &font, CV_RGB(0,0,255)); 

        }

        cvShowImage( "result", img ); 
        key = cvWaitKey( 1 );

    }
    cvReleaseMemStorage(storage);
    cvReleaseImage(gray);
    cvDestroyWindow( "result" );
    cvReleaseCapture( &capture );    

    return 0;
}