How do I find five smaller shapes

Image<Gray, byte> imgOutput = imgInput.Convert<Gray, byte>();
            binary = new Image<Gray, byte>(imgInput.Width, imgInput.Height, new Gray(0));
            CvInvoke.AdaptiveThreshold(imgOutput, binary, 255, Emgu.CV.CvEnum.AdaptiveThresholdType.GaussianC, Emgu.CV.CvEnum.ThresholdType.Binary, 5, 0.0);

            Emgu.CV.Util.VectorOfVectorOfPoint contours = new Emgu.CV.Util.VectorOfVectorOfPoint();

            Mat hier = new Mat();

            CvInvoke.FindContours(binary, contours, hier,     Emgu.CV.CvEnum.RetrType.External, Emgu.CV.CvEnum.ChainApproxMethod.ChainApproxSimple);
            Dictionary<int, double> dict = new Dictionary<int, double>();
            if (contours.Size > 0)
            {
                for (int i = 0; i < contours.Size; i++)
                {
                    double aera = CvInvoke.ContourArea(contours[i]);
                    Rectangle rect = CvInvoke.BoundingRectangle(contours[i]);
                   
                        dict.Add(i, aera);
                    
                }
            }
            var item = dict.OrderBy(v => v.Value).Take(5);
           
            foreach (var it in item)
            {
                int key = int.Parse(it.Key.ToString());
                Rectangle rect = CvInvoke.BoundingRectangle(contours[key]);
                CvInvoke.Rectangle(imgInput, rect, new MCvScalar(255, 0, 0), 8);
                pictureBox2.Image = imgInput.Bitmap;

                
            }
        }