private static void drawContour(IList <PointF> controlPoints, Image <Bgr, byte> image)
{
const float CONTOUR_TENSION = 0;
/******************** contour and control points *********************/
var pointIndices = CardinalSpline.GetEqualyDistributedPointIndices(controlPoints, CONTOUR_TENSION, 500);
var points = CardinalSpline.InterpolateAt(controlPoints, CONTOUR_TENSION, pointIndices);
var normals = new List <LineSegment2DF>();
var normalIndices = CardinalSpline.GetEqualyDistributedPointIndices(controlPoints, CONTOUR_TENSION, 100);
foreach (var idx in normalIndices)
{
var pt = CardinalSpline.InterpolateAt(controlPoints, CONTOUR_TENSION, idx);
var normalDirection = CardinalSpline.NormalAt(controlPoints, CONTOUR_TENSION, idx);
var orientation = (int)Angle.ToDegrees(System.Math.Atan2(normalDirection.Y, normalDirection.X));
var normal = getLine(orientation, pt, 20);
normals.Add(normal);
}
/******************** contour and control points *********************/
image.Draw(points.ToArray(),
Bgr8.Blue,
3);
image.Draw(controlPoints.Select(x => new CircleF(x, 3)), Bgr8.Red, 3);
image.Draw(normals, Bgr8.Green, 3, false);
}
private static ITemplate create(IEnumerable <PointF> normalizedPoints,
int scale,
int rotation,
string label = "")
{
var pointTransform = Transforms2D.Combine
(
Transforms2D.Scale(scale, scale),
Transforms2D.Rotation((float)Angle.ToRadians(rotation))
);
var transformedPts = normalizedPoints.Transform(pointTransform).ToList();
var boundingRect = transformedPts.BoundingRect();
var offset = boundingRect.Location;
transformedPts = transformedPts.Transform(Transforms2D.Translation(-offset.X, -offset.Y)).ToList();
var template = new OpenHandTemplate();
var features = new List <Feature>();
//var validIdxRange = CardinalSpline.ValidIndicesRange(transformedPts.Count);
//for (int i = validIdxRange.Min; i <= validIdxRange.Max; i++)
for (int i = CardinalSpline.MIN_INDEX; i < (transformedPts.Count - 1 - CardinalSpline.MAX_INDEX_OFFSET); i++)
{
var intPt = transformedPts[i].Round();
var direction = CardinalSpline.NormalAt(transformedPts, CONTOUR_TENSION, i);
var orientDeg = (int)Angle.ToDegrees(Math.Atan2(direction.Y, direction.X));
orientDeg = (int)Angle.NormalizeDegrees(orientDeg + 180);
var feature = createFeature(intPt.X, intPt.Y, orientDeg);
features.Add(feature);
}
template.Features = features.ToArray();
template.Size = Size.Round(boundingRect.Size);
template.ClassLabel = label;
return(template);
}