Logo recognition using emguCV

Question

I have implemented this code and have detcted logo in couple of images, I was able to get some results like this but I need to count that how many images contain this logo, may be something like finding all keypoints of logo inside big image or some thing else. I can see I have foud the logo inside big image but I want to confirm it programetically, using emguCV. Please help.

-- edited

this is the piece of code with homography, can you guide me a bit here, because I am totaly new to emguCV and openV please help me counting these inlier

public static Mat Draw(Mat modelImage, Mat observedImage, out long matchTime)
    {
        Mat homography;
        VectorOfKeyPoint modelKeyPoints;
        VectorOfKeyPoint observedKeyPoints;
        using (VectorOfVectorOfDMatch matches = new VectorOfVectorOfDMatch())
        {
            Mat mask;
            FindMatch(modelImage, observedImage, out matchTime, out modelKeyPoints, out observedKeyPoints, matches,
               out mask, out homography);

            //Draw the matched keypoints
            Mat result = new Mat();// new Size(400,400), modelImage.Depth, modelImage.NumberOfChannels);
            Features2DToolbox.DrawMatches(modelImage, modelKeyPoints, observedImage, observedKeyPoints,
               matches, result, new MCvScalar(255, 255, 255), new MCvScalar(255, 255, 255), mask);

            #region draw the projected region on the image

            if (homography != null)
            {
                
                //draw a rectangle along the projected model
                Rectangle rect = new Rectangle(Point.Empty, modelImage.Size);
                PointF[] pts = new PointF[]
                {
                      new PointF(rect.Left, rect.Bottom),
                      new PointF(rect.Right, rect.Bottom),
                      new PointF(rect.Right, rect.Top),
                      new PointF(rect.Left, rect.Top)
                };
                pts = CvInvoke.PerspectiveTransform(pts, homography);

                Point[] points = Array.ConvertAll<PointF, Point>(pts, Point.Round);
                using (VectorOfPoint vp = new VectorOfPoint(points))
                {
                    CvInvoke.Polylines(result, vp, true, new MCvScalar(255, 0, 0, 255), 5);
                }

            }

            #endregion

            return result;

        }
    }

Answer 1

I think my answer is a bit to late, but may I can help someone other. With following code snipppet you can count the matching feature points that belongs to you question (counting lines). The importents variables is the mask variable. It contains the informations.

private int CountHowManyParisExist(Mat mask) { 

Matrix<Byte> matrix = new Matrix<Byte>(mask.Rows, mask.Cols);
mask.CopyTo(matrix);

var matched = matrix.ManagedArray;
var list = matched.OfType<byte>().ToList();
var count = list.Count(a => a.Equals(1));

return count; 
}