private GeneralizedDistanceTransform2D CalculateMinEnergiesForAllParentEdges(
ShapeModel model,
ShapeConstraints shapeConstraints,
int parentEdgeIndex,
int currentEdgeIndex,
IList <ILengthAngleConstraints> lengthAngleConstraints)
{
// Calculate child transforms
List <GeneralizedDistanceTransform2D> childDistanceTransforms = new List <GeneralizedDistanceTransform2D>();
foreach (int neighborEdgeIndex in model.IterateNeighboringEdgeIndices(currentEdgeIndex))
{
// Iterate only through children
if (neighborEdgeIndex == parentEdgeIndex)
{
continue;
}
GeneralizedDistanceTransform2D childTransform = CalculateMinEnergiesForAllParentEdges(
model, shapeConstraints, currentEdgeIndex, neighborEdgeIndex, lengthAngleConstraints);
Debug.Assert(childTransform.IsComputed);
childDistanceTransforms.Add(childTransform);
}
ShapeEdgePairParams pairParams = model.GetEdgePairParams(parentEdgeIndex, currentEdgeIndex);
GeneralizedDistanceTransform2D transform = this.AllocateDistanceTransform();
SetupTransformFinitePenaltyRanges(transform, pairParams, lengthAngleConstraints[currentEdgeIndex]);
SetupTransformInterestRanges(transform, lengthAngleConstraints[parentEdgeIndex]);
Func <double, double, double> penaltyFunction =
(scaledLength, shiftedAngle) =>
{
double length = scaledLength / pairParams.MeanLengthRatio;
double angle = shiftedAngle + pairParams.MeanAngle;
double lengthTolerance = transform.GridStepSizeX / pairParams.MeanLengthRatio;
double angleTolerance = transform.GridStepSizeY;
if (!lengthAngleConstraints[currentEdgeIndex].InRange(length, lengthTolerance, angle, angleTolerance))
{
return(1e+20);
}
double penalty =
CalculateMinUnaryEdgeEnergy(currentEdgeIndex, model, shapeConstraints, length) +
CalculateMinPairwiseEdgeEnergy(length, angle, childDistanceTransforms);
return(penalty);
};
transform.Compute(
0.5 / MathHelper.Sqr(pairParams.LengthDiffDeviation),
0.5 / MathHelper.Sqr(pairParams.AngleDeviation),
penaltyFunction);
return(transform);
}
private void SetupTransformFinitePenaltyRanges(
GeneralizedDistanceTransform2D transform, ShapeEdgePairParams pairParams, ILengthAngleConstraints lengthAngleConstraints)
{
Range lengthRange = lengthAngleConstraints.LengthBoundary;
Range angleRange = lengthAngleConstraints.AngleBoundary;
transform.AddFinitePenaltyRangeX(
new Range(lengthRange.Left * pairParams.MeanLengthRatio, lengthRange.Right * pairParams.MeanLengthRatio));
if (!angleRange.Outside)
{
transform.AddFinitePenaltyRangeY(new Range(angleRange.Left - pairParams.MeanAngle, angleRange.Right - pairParams.MeanAngle));
}
else
{
transform.AddFinitePenaltyRangeY(new Range(-Math.PI - pairParams.MeanAngle, angleRange.Left - pairParams.MeanAngle));
transform.AddFinitePenaltyRangeY(new Range(angleRange.Right - pairParams.MeanAngle, Math.PI - pairParams.MeanAngle));
}
}
private void SetupTransformFinitePenaltyRanges(
GeneralizedDistanceTransform2D transform, ShapeEdgePairParams pairParams, ILengthAngleConstraints lengthAngleConstraints)
{
Range lengthRange = lengthAngleConstraints.LengthBoundary;
Range angleRange = lengthAngleConstraints.AngleBoundary;
transform.AddFinitePenaltyRangeX(
new Range(lengthRange.Left * pairParams.MeanLengthRatio, lengthRange.Right * pairParams.MeanLengthRatio));
if (!angleRange.Outside)
transform.AddFinitePenaltyRangeY(new Range(angleRange.Left - pairParams.MeanAngle, angleRange.Right - pairParams.MeanAngle));
else
{
transform.AddFinitePenaltyRangeY(new Range(-Math.PI - pairParams.MeanAngle, angleRange.Left - pairParams.MeanAngle));
transform.AddFinitePenaltyRangeY(new Range(angleRange.Right - pairParams.MeanAngle, Math.PI - pairParams.MeanAngle));
}
}
