public Contour() { // cvContourArea, cvArcLength // 輪郭によって区切られた領域の面積と,輪郭の長さを求める const int SIZE = 500; // (1)画像を確保し初期化する using (CvMemStorage storage = new CvMemStorage()) using (IplImage img = new IplImage(SIZE, SIZE, BitDepth.U8, 3)) { img.Zero(); // (2)点列を生成する CvSeq<CvPoint> points = new CvSeq<CvPoint>(SeqType.PolyLine, storage); CvRNG rng = new CvRNG((ulong)DateTime.Now.Ticks); double scale = rng.RandReal() + 0.5; CvPoint pt0 = new CvPoint { X = (int)(Math.Cos(0) * SIZE / 4 * scale + SIZE / 2), Y = (int)(Math.Sin(0) * SIZE / 4 * scale + SIZE / 2) }; img.Circle(pt0, 2, CvColor.Green); points.Push(pt0); for (int i = 1; i < 20; i++) { scale = rng.RandReal() + 0.5; CvPoint pt1 = new CvPoint { X = (int)(Math.Cos(i * 2 * Math.PI / 20) * SIZE / 4 * scale + SIZE / 2), Y = (int)(Math.Sin(i * 2 * Math.PI / 20) * SIZE / 4 * scale + SIZE / 2) }; img.Line(pt0, pt1, CvColor.Green, 2); pt0.X = pt1.X; pt0.Y = pt1.Y; img.Circle(pt0, 3, CvColor.Green, Cv.FILLED); points.Push(pt0); } img.Line(pt0, points.GetSeqElem(0).Value, CvColor.Green, 2); // (3)包含矩形,面積,長さを求める CvRect rect = points.BoundingRect(false); double area = points.ContourArea(); double length = points.ArcLength(CvSlice.WholeSeq, 1); // (4)結果を画像に書き込む img.Rectangle(new CvPoint(rect.X, rect.Y), new CvPoint(rect.X + rect.Width, rect.Y + rect.Height), CvColor.Red, 2); string text_area = string.Format("Area: wrect={0}, contour={1}", rect.Width * rect.Height, area); string text_length = string.Format("Length: rect={0}, contour={1}", 2 * (rect.Width + rect.Height), length); using (CvFont font = new CvFont(FontFace.HersheySimplex, 0.7, 0.7, 0, 1, LineType.AntiAlias)) { img.PutText(text_area, new CvPoint(10, img.Height - 30), font, CvColor.White); img.PutText(text_length, new CvPoint(10, img.Height - 10), font, CvColor.White); } // (5)画像を表示,キーが押されたときに終了 using (CvWindow window = new CvWindow("BoundingRect", WindowMode.AutoSize)) { window.Image = img; CvWindow.WaitKey(0); } } }
public Contour() { // cvContourArea, cvArcLength // 輪郭によって区切られた領域の面積と,輪郭の長さを求める const int SIZE = 500; // (1)画像を確保し初期化する using (CvMemStorage storage = new CvMemStorage()) using (IplImage img = new IplImage(SIZE, SIZE, BitDepth.U8, 3)) { img.Zero(); // (2)点列を生成する CvSeq <CvPoint> points = new CvSeq <CvPoint>(SeqType.PolyLine, storage); CvRNG rng = new CvRNG((ulong)DateTime.Now.Ticks); double scale = rng.RandReal() + 0.5; CvPoint pt0 = new CvPoint { X = (int)(Math.Cos(0) * SIZE / 4 * scale + SIZE / 2), Y = (int)(Math.Sin(0) * SIZE / 4 * scale + SIZE / 2) }; img.Circle(pt0, 2, CvColor.Green); points.Push(pt0); for (int i = 1; i < 20; i++) { scale = rng.RandReal() + 0.5; CvPoint pt1 = new CvPoint { X = (int)(Math.Cos(i * 2 * Math.PI / 20) * SIZE / 4 * scale + SIZE / 2), Y = (int)(Math.Sin(i * 2 * Math.PI / 20) * SIZE / 4 * scale + SIZE / 2) }; img.Line(pt0, pt1, CvColor.Green, 2); pt0.X = pt1.X; pt0.Y = pt1.Y; img.Circle(pt0, 3, CvColor.Green, Cv.FILLED); points.Push(pt0); } img.Line(pt0, points.GetSeqElem(0).Value, CvColor.Green, 2); // (3)包含矩形,面積,長さを求める CvRect rect = points.BoundingRect(false); double area = points.ContourArea(); double length = points.ArcLength(CvSlice.WholeSeq, 1); // (4)結果を画像に書き込む img.Rectangle(new CvPoint(rect.X, rect.Y), new CvPoint(rect.X + rect.Width, rect.Y + rect.Height), CvColor.Red, 2); string text_area = string.Format("Area: wrect={0}, contour={1}", rect.Width * rect.Height, area); string text_length = string.Format("Length: rect={0}, contour={1}", 2 * (rect.Width + rect.Height), length); using (CvFont font = new CvFont(FontFace.HersheySimplex, 0.7, 0.7, 0, 1, LineType.AntiAlias)) { img.PutText(text_area, new CvPoint(10, img.Height - 30), font, CvColor.White); img.PutText(text_length, new CvPoint(10, img.Height - 10), font, CvColor.White); } // (5)画像を表示,キーが押されたときに終了 using (CvWindow window = new CvWindow("BoundingRect", WindowMode.AutoSize)) { window.Image = img; CvWindow.WaitKey(0); } } }
static IplImage GetCountours(IplImage src) { CvMemStorage mem = Cv.CreateMemStorage(0); CvSeq <CvPoint> firstContour = null; IplImage dst = GetThresholdImage(src); dst = GetThresholdImage(dst); int count = dst.FindContours(mem, out firstContour); //src.DrawContours(firstContour, CvColor.Green, CvColor.Blue, 2); //src.DrawRect(firstContour.BoundingRect(), CvColor.Red); src = src.GetSubImage(firstContour.BoundingRect()); mem.Dispose(); firstContour.Dispose(); dst.Dispose(); return(src); }