public SegmentationSolution SegmentImage(Image2D <Color> image, ObjectBackgroundColorModels colorModels)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
if (colorModels == null)
{
throw new ArgumentNullException("colorModels");
}
this.ImageSegmentator = new ImageSegmentator(
image,
colorModels,
this.ColorDifferencePairwiseTermCutoff,
this.ColorDifferencePairwiseTermWeight,
this.ConstantPairwiseTermWeight,
this.ObjectColorUnaryTermWeight,
this.BackgroundColorUnaryTermWeight,
this.ObjectShapeUnaryTermWeight,
this.BackgroundShapeUnaryTermWeight);
DebugConfiguration.WriteImportantDebugText(
"Segmented image size is {0}x{1}.",
this.ImageSegmentator.ImageSize.Width,
this.ImageSegmentator.ImageSize.Height);
SegmentationSolution solution = null;
try
{
if (this.ShapeModel == null)
{
throw new InvalidOperationException("Shape model must be specified before segmenting image.");
}
DebugConfiguration.WriteImportantDebugText("Running segmentation algorithm...");
this.IsRunning = true;
solution = this.SegmentCurrentImage();
if (solution == null)
{
throw new InvalidOperationException("Segmentation solution can not be null.");
}
}
finally
{
if (this.IsStopping)
{
this.WasStopped = true;
}
this.IsRunning = false;
this.IsStopping = false;
}
DebugConfiguration.WriteImportantDebugText("Finished");
return(solution);
}
protected override SegmentationSolution SegmentCurrentImage()
{
DebugConfiguration.WriteImportantDebugText("Performing initial segmentation...");
this.ImageSegmentator.SegmentImageWithShapeTerms((x, y) => ObjectBackgroundTerm.Zero);
Image2D <bool> prevMask = this.ImageSegmentator.GetLastSegmentationMask();
Shape prevShape = this.ShapeModel.FitMeanShape(
this.ImageSegmentator.ImageSize.Width, this.ImageSegmentator.ImageSize.Height);
double prevEnergy = 0;
for (int iteration = 1; iteration <= this.MaxIterationCount && !this.IsStopping; ++iteration)
{
this.WaitIfPaused();
DebugConfiguration.WriteImportantDebugText("Iteration {0}", iteration);
Image2D <bool> prevMaskCopy = prevMask;
Shape currentShape = this.ShapeFitter.Run(
prevShape,
(s, t) => this.ShapeMutator.MutateShape(s, this.ShapeModel, this.ImageSegmentator.ImageSize, t / this.ShapeFitter.StartTemperature),
s => this.CalcObjective(s, prevMaskCopy));
double currentEnergy = this.ImageSegmentator.SegmentImageWithShapeTerms((x, y) => this.ShapeModel.CalculatePenalties(currentShape, new Vector(x, y)));
Image2D <bool> currentMask = this.ImageSegmentator.GetLastSegmentationMask();
int differentValues = Image2D <bool> .DifferentValueCount(prevMask, currentMask);
double changedPixelRate = (double)differentValues / (this.ImageSegmentator.ImageSize.Width * this.ImageSegmentator.ImageSize.Height);
DebugConfiguration.WriteImportantDebugText("On iteration {0}:", iteration);
DebugConfiguration.WriteImportantDebugText("Energy is {0:0.000}", currentEnergy);
DebugConfiguration.WriteImportantDebugText("Changed pixel rate is {0:0.000000}", changedPixelRate);
DebugConfiguration.WriteImportantDebugText();
if (iteration > this.MinIterationCount && changedPixelRate < this.MinChangeRate)
{
DebugConfiguration.WriteImportantDebugText("Changed pixel rate is too low, breaking...");
break;
}
prevMask = currentMask;
prevShape = currentShape;
prevEnergy = currentEnergy;
if (IterationFinished != null)
{
IterationFinished(this, new SegmentationIterationFinishedEventArgs(
iteration,
currentShape,
this.ImageSegmentator.GetLastSegmentationMask(),
this.ImageSegmentator.GetLastUnaryTerms(),
this.ImageSegmentator.GetLastShapeTerms()));
}
}
return(new SegmentationSolution(prevShape, prevMask, prevEnergy));
}
protected override SegmentationSolution SegmentCurrentImage()
{
if (this.Shape != null && this.Shape.Structure != this.ShapeModel.Structure)
{
throw new InvalidOperationException("Specified shape differs in structure from shape model.");
}
double segmentationEnergy = this.ImageSegmentator.SegmentImageWithShapeTerms(
(x, y) => this.Shape == null ? ObjectBackgroundTerm.Zero : CalculateShapeTerms(new Vector(x, y)));
double shapeEnergy = this.Shape == null ? 0 : this.ShapeModel.CalculateEnergy(this.Shape);
double totalEnergy = segmentationEnergy + shapeEnergy * this.ShapeEnergyWeight;
DebugConfiguration.WriteImportantDebugText(
"Solution energy: {0:0.0000} ({1:0.0000} + {2:0.0000} * {3:0.0000})",
totalEnergy,
segmentationEnergy,
this.ShapeEnergyWeight,
shapeEnergy);
return(new SegmentationSolution(this.Shape, this.ImageSegmentator.GetLastSegmentationMask(), totalEnergy));
}
private double CalcObjective(Shape shape, bool report)
{
this.UpdateShapeTerms(shape);
double shapeEnergy = this.ShapeModel.CalculateEnergy(shape);
double labelingEnergy = this.ImageSegmentator.SegmentImageWithShapeTerms((x, y) => this.shapeTerms[x, y]);
double energy = shapeEnergy * this.ShapeEnergyWeight + labelingEnergy;
double additionalPenalty = this.AdditionalShapePenalty == null ? 0 : this.AdditionalShapePenalty(shape);
double totalEnergy = energy + additionalPenalty;
if (report)
{
DebugConfiguration.WriteImportantDebugText(
"Solution energy: {0:0.0000} ({1:0.0000} + {2:0.0000} * {3:0.0000} + {4:0.0000})",
totalEnergy,
labelingEnergy,
this.ShapeEnergyWeight,
shapeEnergy,
additionalPenalty);
}
return(totalEnergy);
}
protected override SegmentationSolution SegmentCurrentImage()
{
if (this.minEdgeWidth >= this.maxEdgeWidth)
{
throw new InvalidOperationException("Min edge width should be less than max edge width.");
}
if (this.startConstraints != null)
{
if (this.startConstraints.ShapeStructure != this.ShapeModel.Structure)
{
throw new InvalidOperationException("Given start constraints have shape structure different from the one specified in shape model.");
}
// TODO: make this check work
//foreach (VertexConstraints vertexConstraints in this.startConstraints.VertexConstraints)
//{
// RectangleF imageRectangle =
// new RectangleF(0, 0, this.ImageSegmentator.ImageSize.Width, this.ImageSegmentator.ImageSize.Height);
// if (!imageRectangle.Contains(vertexConstraints.CoordRectangle))
// throw new InvalidOperationException("Given start constraints are not fully inside the segmented image.");
//}
}
this.shapeUnaryTerms = new Image2D <ObjectBackgroundTerm>(
this.ImageSegmentator.ImageSize.Width, this.ImageSegmentator.ImageSize.Height);
ShapeConstraints constraints = this.startConstraints;
if (constraints == null)
{
constraints = ShapeConstraints.CreateFromBounds(
this.ShapeModel.Structure,
Vector.Zero,
new Vector(this.ImageSegmentator.ImageSize.Width, this.ImageSegmentator.ImageSize.Height),
this.minEdgeWidth,
this.maxEdgeWidth);
}
if (this.BranchAndBoundStarted != null)
{
this.BranchAndBoundStarted(this, EventArgs.Empty);
}
this.startTime = DateTime.Now;
DebugConfiguration.WriteImportantDebugText("Breadth-first branch-and-bound started.");
SortedSet <EnergyBound> front = this.BreadthFirstBranchAndBoundTraverse(constraints);
ReportBranchAndBoundCompletion(front.Min);
if (front.Min.Constraints.CheckIfSatisfied(this.maxCoordFreedom, this.maxWidthFreedom))
{
DebugConfiguration.WriteImportantDebugText("Breadth-first branch-and-bound finished in {0}.",
DateTime.Now - this.startTime);
DebugConfiguration.WriteImportantDebugText("Best lower bound is {0:0.0000}", front.Min.Bound);
}
else
{
DebugConfiguration.WriteImportantDebugText("Breadth-first branch-and-bound forced to stop after {0}.", DateTime.Now - this.startTime);
DebugConfiguration.WriteImportantDebugText("Min energy value achieved is {0:0.0000}", front.Min.Bound);
}
EnergyBound collapsedBfsSolution = this.CalculateEnergyBound(front.Min.Constraints.Collapse());
Shape resultShape = front.Min.Constraints.CollapseToShape();
DebugConfiguration.WriteImportantDebugText(
"Collapsed solution energy value is {0:0.0000} ({1:0.0000} + {2:0.0000})",
collapsedBfsSolution.Bound,
collapsedBfsSolution.SegmentationEnergy,
collapsedBfsSolution.ShapeEnergy * this.ShapeEnergyWeight);
return(new SegmentationSolution(resultShape, this.ImageSegmentator.GetLastSegmentationMask(), collapsedBfsSolution.Bound));
}