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POAccessViolationException was unhandled in EMGU CV
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  1. POAccessViolationException was unhandled in EMGU CV
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    copied!<p>I always get this error when I run my program...</p> <p><img src="https://i.stack.imgur.com/KEOaf.png" alt="enter image description here"></p> <p>i'm not sure about what's wrong with my program, FYI, actually my program consist of many image processing algorithm's such as </p> <ul> <li>viola-jones, haarcascade for hand detection</li> <li>camshift + kalman filter for hand tracking</li> <li>convex hull and convexity defects for counting finger</li> <li>and other preprocessing ....</li> </ul> <p>I have no idea whether these process triggering the error or not...</p> <p>but when I remove convexhull / convexity defects, the errors gone... any solution?</p> <p>Edited : (added)</p> <p>this is the code snippet</p> <pre><code> private void ExtractContourAndHull() { using (MemStorage storage = new MemStorage()) { Contour&lt;Point&gt; contours = backproject.FindContours(Emgu.CV.CvEnum.CHAIN_APPROX_METHOD.CV_CHAIN_APPROX_SIMPLE, Emgu.CV.CvEnum.RETR_TYPE.CV_RETR_LIST, storage); Contour&lt;Point&gt; biggestContour = null; Double Result1 = 0; Double Result2 = 0; while (contours != null) { Result1 = contours.Area; if (Result1 &gt; Result2) { Result2 = Result1; biggestContour = contours; } contours = contours.HNext; } if (biggestContour != null) { //image.Draw(biggestContour, new Bgr(Color.DarkViolet), 2); Contour&lt;Point&gt; currentContour = biggestContour.ApproxPoly(biggestContour.Perimeter * 0.005, storage); image.Draw(currentContour, new Bgr(Color.LimeGreen), 2); biggestContour = currentContour; hull = biggestContour.GetConvexHull(ORIENTATION.CV_CLOCKWISE); box = biggestContour.GetMinAreaRect(); PointF[] points = box.GetVertices(); //handRect = box.MinAreaRect(); //image.Draw(handRect, new Bgr(200, 0, 0), 1); Point[] ps = new Point[points.Length]; for (int i = 0; i &lt; points.Length; i++) ps[i] = new Point((int)points[i].X, (int)points[i].Y); image.DrawPolyline(hull.ToArray(), true, new Bgr(200, 125, 75), 2); image.Draw(new CircleF(new PointF(box.center.X, box.center.Y), 3), new Bgr(200, 125, 75), 2); //ellip.MCvBox2D= CvInvoke.cvFitEllipse2(biggestContour.Ptr); //image.Draw(new Ellipse(ellip.MCvBox2D), new Bgr(Color.LavenderBlush), 3); //PointF center; //float radius; //CvInvoke.cvMinEnclosingCircle(biggestContour.Ptr, out center, out radius); //image.Draw(new CircleF(center, radius), new Bgr(Color.Gold), 2); //image.Draw(new CircleF(new PointF(ellip.MCvBox2D.center.X, ellip.MCvBox2D.center.Y), 3), new Bgr(100, 25, 55), 2); //image.Draw(ellip, new Bgr(Color.DeepPink), 2); //CvInvoke.cvEllipse(image, new Point((int)ellip.MCvBox2D.center.X, (int)ellip.MCvBox2D.center.Y), new System.Drawing.Size((int)ellip.MCvBox2D.size.Width, (int)ellip.MCvBox2D.size.Height), ellip.MCvBox2D.angle, 0, 360, new MCvScalar(120, 233, 88), 1, Emgu.CV.CvEnum.LINE_TYPE.EIGHT_CONNECTED, 0); //image.Draw(new Ellipse(new PointF(box.center.X, box.center.Y), new SizeF(box.size.Height, box.size.Width), box.angle), new Bgr(0, 0, 0), 2); filteredHull = new Seq&lt;Point&gt;(storage); for (int i = 0; i &lt; hull.Total; i++) { if (Math.Sqrt(Math.Pow(hull[i].X - hull[i + 1].X, 2) + Math.Pow(hull[i].Y - hull[i + 1].Y, 2)) &gt; box.size.Width / 10) { filteredHull.Push(hull[i]); } } defects = biggestContour.GetConvexityDefacts(storage, Emgu.CV.CvEnum.ORIENTATION.CV_CLOCKWISE); defectArray = defects.ToArray(); } } } private void DrawAndComputeFingersNum() { using (MemStorage storage = new MemStorage()) { int fingerNum = 0; #region hull drawing //for (int i = 0; i &lt; filteredHull.Total; i++) //{ // PointF hullPoint = new PointF((float)filteredHull[i].X, // (float)filteredHull[i].Y); // CircleF hullCircle = new CircleF(hullPoint, 4); // image.Draw(hullCircle, new Bgr(Color.Aquamarine), 2); //} #endregion #region defects drawing ***defects = new Seq&lt;MCvConvexityDefect&gt;(storage);*** for (int i = 0; i &lt; defects.Total; i++) { PointF startPoint = new PointF((float)defectArray[i].StartPoint.X, (float)defectArray[i].StartPoint.Y); PointF depthPoint = new PointF((float)defectArray[i].DepthPoint.X, (float)defectArray[i].DepthPoint.Y); PointF endPoint = new PointF((float)defectArray[i].EndPoint.X, (float)defectArray[i].EndPoint.Y); LineSegment2D startDepthLine = new LineSegment2D(defectArray[i].StartPoint, defectArray[i].DepthPoint); LineSegment2D depthEndLine = new LineSegment2D(defectArray[i].DepthPoint, defectArray[i].EndPoint); CircleF startCircle = new CircleF(startPoint, 5f); CircleF depthCircle = new CircleF(depthPoint, 5f); CircleF endCircle = new CircleF(endPoint, 5f); MCvFont angga = new MCvFont(Emgu.CV.CvEnum.FONT.CV_FONT_HERSHEY_SCRIPT_COMPLEX, 0.5, 0.5); // image.Draw(defectArray[i].StartPoint.X.ToString() + " , " + defectArray[i].StartPoint.Y.ToString(), ref angga, new Point(defectArray[i].StartPoint.X, defectArray[i].StartPoint.Y), new Bgr(Color.Red)); image.Draw(defectArray[i].StartPoint.X.ToString() + " , " + defectArray[i].StartPoint.Y.ToString() + " , " + i.ToString(), ref angga, new Point(defectArray[i].StartPoint.X, defectArray[i].StartPoint.Y), new Bgr(Color.Red)); //Custom heuristic based on some experiment, double check it before use if ((startCircle.Center.Y &lt; box.center.Y || depthCircle.Center.Y &lt; box.center.Y) &amp;&amp; (startCircle.Center.Y &lt; depthCircle.Center.Y) &amp;&amp; (Math.Sqrt(Math.Pow(startCircle.Center.X - depthCircle.Center.X, 2) + Math.Pow(startCircle.Center.Y - depthCircle.Center.Y, 2)) &gt; box.size.Height / 6.5)) { fingerNum++; //image.Draw(startDepthLine, new Bgr(Color.Blue), 2); //image.Draw(depthEndLine, new Bgr(Color.Magenta), 2); } image.Draw(startCircle, new Bgr(Color.Red), 2); image.Draw(depthCircle, new Bgr(Color.Yellow), 5); //image.Draw(endCircle, new Bgr(Color.DarkBlue), 4); } #endregion MCvFont font = new MCvFont(Emgu.CV.CvEnum.FONT.CV_FONT_HERSHEY_DUPLEX, 5d, 5d); image.Draw(fingerNum.ToString(), ref font, new Point(50, 150), new Bgr(Color.White)); hand.fingerChangedCompute = fingerNum; } } public MemStorage storage { get; set; } </code></pre> <p>orgin take a look at DrawandComputeFingersNUm() you'll see a line </p> <pre><code>defects = new Seq&lt;MCvConvexityDefect&gt;(storage); </code></pre> <p>the problem will occur when I uncomment the line above..</p> <p>anyone knows how to solve this problem? any help would be appreciated.. thanks</p>
 

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