Memory leak for using Emgucv facedetection function.

hi guys,

i am doing now face detection in unity3d and for that i followed Kenny Allau's tutorial to have face detect function in my laptop.

http://www.kennyallau.com/single-post/2017/06/05/Example-face-tracker-and-pedestrian-detector-using-Emgu-CV-with-Unity-3D-Part-I

And at the first time it seems to work quite good. But after about 3 min my laptop became quite slow and it didn't work anymore. The reason was memory leak.

This is actually my guess : var faces = _cascadeClassifier.DetectMultiScale(grayFrame, 1.1, 4, new System.Drawing.Size(frameWidth/8, frameHeight/8));

this part of code takes memory progressively but doesn't give it back.

Maybe is there anyone who can solve this problem or knows something?

here is whole code that i used,

//Face detection using HAAR Cascade

using UnityEngine; using System.IO; using Emgu.CV; using Emgu.CV.Structure;

public class faceDetect : MonoBehaviour {

 private int frameWidth;
 private int frameHeight;
 private VideoCapture cvCapture;
 private CascadeClassifier _cascadeClassifier;
 private Image<Bgr, byte> currentFrameBgr;

 public Material mt;

 void Start () {

     cvCapture = new VideoCapture(0);

    _cascadeClassifier = new CascadeClassifier(Application.dataPath + "/haarcascade_frontalface_alt.xml");

    frameWidth = (int)cvCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameWidth);
    frameHeight = (int)cvCapture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameHeight);

    cvCapture.Start();

 }
 
 void Update () {

     faceDetector();
 }


 private void faceDetector()
 {
     currentFrameBgr = cvCapture.QueryFrame().ToImage<Bgr, byte>();
     
     Texture2D tex = new Texture2D(640, 480);

     if (currentFrameBgr != null)
     {
         Image<Gray, byte> grayFrame = currentFrameBgr.Convert<Gray, byte>();

         var faces = _cascadeClassifier.DetectMultiScale(grayFrame, 1.1, 4, new System.Drawing.Size(frameWidth/8, frameHeight/8));

         foreach (var face in faces)
         {
             currentFrameBgr.Draw(face, new Bgr(0, 255, 0), 3);
         }

         //Convert this image into Bitmap, the pixel values are copied over to the Bitmap
         currentFrameBgr.ToBitmap();

         MemoryStream memstream = new MemoryStream();
         currentFrameBgr.Bitmap.Save(memstream, currentFrameBgr.Bitmap.RawFormat);

         tex.LoadImage(memstream.ToArray());
         mt.mainTexture = tex;
     }
 }

 private void OnDestroy()
 {
     //release from memory
     cvCapture.Dispose();
     cvCapture.Stop();
     
 }

}