/// <summary>
/// Initializes a new instance of the <see cref="NormalizedHands"/> class.
/// </summary>
/// <param name="left">The normalized left hand.</param>
/// <param name="right">The normalized right hand.</param>
public NormalizedHands(NormalizedHand left, NormalizedHand right)
{
this.Left = left;
this.Right = right;
double centerX = (left.X + right.X) / 2;
double centerY = (left.Y + right.Y) / 2;
this.Center = new PointD(centerX, centerY);
this.RatioOfLeftWeightToRightWeight = left.Weight / right.Weight;
}
private HandsDetectorResult DetectHandsInternally(BgrImage image)
{
int handAreaWidth = image.Width / DIVISOR_TO_GET_HAND_AREA_WIDTH_FROM_IMAGE_WIDTH;
NormalizedHand left = this.EvaluatePixels(image, 0, handAreaWidth, this.tuning.HandsColorMaps.Left, this.neutralHands?.Left);
NormalizedHand right = this.EvaluatePixels(image, image.Width - handAreaWidth, handAreaWidth, this.tuning.HandsColorMaps.Right, this.neutralHands?.Right);
int radius = image.Width * image.Height / DIVISOR_TO_GET_HAND_MARKER_CIRCLE_RADIUS_FROM_IMAGE_SIZE;
if (this.Tuned && this.neutralHands != null)
{
image.DrawLineSegment(left.X, left.Y, this.neutralHands.Center.X, this.neutralHands.Center.Y, Color.Yellow, radius);
image.DrawLineSegment(this.neutralHands.Center.X, this.neutralHands.Center.Y, right.X, right.Y, Color.Yellow, radius);
}
image.DrawCircle(left.X, left.Y, Color.Blue, radius, BgrImage.FILL_DRAWING);
image.DrawCircle(right.X, right.Y, Color.Blue, radius, BgrImage.FILL_DRAWING);
NormalizedHands normalizedHands = new NormalizedHands(left, right);
return(new HandsDetectorResult(normalizedHands, image));
}
private NormalizedHand EvaluatePixels(BgrImage image, int startX, int width, ColorMap colorMap, NormalizedHand neutralHand)
{
HandBuilder handBuilder = new HandBuilder();
for (int y = 0; y < image.Height; y++)
{
for (int x = startX; x < startX + width; x++)
{
BgrPixel pixel = image.GetPixel(x, y);
if (this.IsBackground(pixel, x, y))
{
image.SetPixel(this.backgroundPixel, x, y);
}
else if (!colorMap.Satisfies(pixel))
{
image.SetPixel(this.unknownPixel, x, y);
}
else
{
image.SetPixel(this.skinPixel, x, y);
handBuilder.Append(x, y);
}
}
}
NormalizedHand detectedHand = new HandNormalizer(image.Width, image.Height).Normalize(handBuilder.Build());
if (this.Tuned && neutralHand != null && detectedHand.Weight < neutralHand.Weight / DIVISOR_TO_GET_VALID_HAND_WEIGHT_LOWER_BOUND_FROM_NEUTRAL_HAND_WEIGHT)
{
// after tuning the neutral hands are cached
// if the weight of the hand is under a threshold
// (which probably means that there is no hand on the image but noise)
// then we're going to use the cached neutral hand instead of the freshly detected (wrong) one
detectedHand = new NormalizedHand(neutralHand.X, neutralHand.Y, neutralHand.Weight);
}
return(detectedHand);
}
