public override IObservable <Contours> Process(IObservable <IplImage> source)
{
return(Observable.Defer(() =>
{
IplImage temp = null;
return source.Select(input =>
{
Seq currentContour;
temp = IplImageHelper.EnsureImageFormat(temp, input.Size, IplDepth.U8, 1);
CV.Copy(input, temp);
var storage = new MemStorage();
var scanner = CV.StartFindContours(temp, storage, Contour.HeaderSize, Mode, Method, Offset);
while ((currentContour = scanner.FindNextContour()) != null)
{
if (MinArea.HasValue || MaxArea.HasValue)
{
var contourArea = CV.ContourArea(currentContour, SeqSlice.WholeSeq);
if (contourArea < MinArea || contourArea > MaxArea)
{
scanner.SubstituteContour(null);
}
}
}
return new Contours(scanner.EndFindContours(), input.Size);
});
}));
}
public override IObservable <IplImage> Process(IObservable <IplImage> source)
{
return(source.Select(input =>
{
var output = new IplImage(input.Size, IplDepth.U8, 1);
distance = IplImageHelper.EnsureImageFormat(distance, input.Size, IplDepth.F32, 1);
laplacian = IplImageHelper.EnsureImageFormat(laplacian, input.Size, IplDepth.F32, 1);
CV.DistTransform(input, distance, DistanceType);
CV.Laplace(distance, laplacian, LaplacianAperture);
CV.Threshold(laplacian, output, RidgeThreshold, 255, ThresholdTypes.BinaryInv);
return output;
}));
}
public IObservable <KeyPointCollection> Process(IObservable <Tuple <IplImage, IplImage> > source)
{
return(Observable.Defer(() =>
{
IplImage temp = null;
IplImage eigen = null;
Point2f[] corners = null;
return source.Select(input =>
{
var image = input.Item1;
var mask = input.Item2;
var result = new KeyPointCollection(image);
var rect = RegionOfInterest;
if (rect.Width > 0 && rect.Height > 0)
{
image = image.GetSubRect(rect);
mask = mask != null ? mask.GetSubRect(rect) : mask;
}
else
{
rect.X = rect.Y = 0;
}
temp = IplImageHelper.EnsureImageFormat(temp, image.Size, IplDepth.F32, 1);
eigen = IplImageHelper.EnsureImageFormat(eigen, image.Size, IplDepth.F32, 1);
if (corners == null || corners.Length != MaxFeatures)
{
corners = new Point2f[MaxFeatures];
}
int cornerCount = corners.Length;
CV.GoodFeaturesToTrack(image, eigen, temp, corners, out cornerCount, QualityLevel, MinDistance, mask);
for (int i = 0; i < cornerCount; i++)
{
corners[i].X += rect.X;
corners[i].Y += rect.Y;
result.Add(corners[i]);
}
return result;
});
}));
}
public override IObservable <IplImage> Process(IObservable <IplImage> source)
{
return(Observable.Defer(() =>
{
IplImage channel1 = null;
IplImage channel2 = null;
IplImage channel3 = null;
IplImage channel4 = null;
return source.Select(input =>
{
channel1 = IplImageHelper.EnsureImageFormat(channel1, input.Size, IplDepth.U8, 1);
channel2 = input.Channels > 1 ? IplImageHelper.EnsureImageFormat(channel2, input.Size, IplDepth.U8, 1) : null;
channel3 = input.Channels > 2 ? IplImageHelper.EnsureImageFormat(channel3, input.Size, IplDepth.U8, 1) : null;
channel4 = input.Channels > 3 ? IplImageHelper.EnsureImageFormat(channel4, input.Size, IplDepth.U8, 1) : null;
var output = new IplImage(input.Size, input.Depth, input.Channels);
CV.Split(input, channel1, channel2, channel3, channel4);
if (channel1 != null)
{
CV.ConvertScale(channel1, channel1, Scale.Val0, 0);
}
if (channel2 != null)
{
CV.ConvertScale(channel2, channel2, Scale.Val1, 0);
}
if (channel3 != null)
{
CV.ConvertScale(channel3, channel3, Scale.Val2, 0);
}
if (channel4 != null)
{
CV.ConvertScale(channel4, channel4, Scale.Val3, 0);
}
CV.Merge(channel1, channel2, channel3, channel4, output);
return output;
});
}));
}
public override IObservable <IplImage> Process(IObservable <IplImage> source)
{
var propertyChanged = Observable.FromEventPattern <EventArgs>(
handler => PropertyChanged += new EventHandler(handler),
handler => PropertyChanged -= new EventHandler(handler));
return(Observable.Defer(() =>
{
IplImage temp = null;
IplConvKernel strel = null;
bool updateStrel = false;
var update = propertyChanged.Subscribe(xs => updateStrel = true);
return source.Select(input =>
{
if (strel == null || updateStrel)
{
var size = Size;
var anchor = Anchor;
updateStrel = false;
if (strel != null)
{
strel.Close();
}
strel = new IplConvKernel(
size.Width,
size.Height,
anchor.X < 0 ? size.Width / 2 : anchor.X,
anchor.Y < 0 ? size.Height / 2 : anchor.Y,
Shape);
}
var output = new IplImage(input.Size, input.Depth, input.Channels);
temp = IplImageHelper.EnsureImageFormat(temp, input.Size, input.Depth, input.Channels);
CV.MorphologyEx(input, output, temp, strel, Operation, Iterations);
return output;
}).Finally(update.Dispose);
}));
}
public override IObservable <RegionActivityCollection> Process(IObservable <IplImage> source)
{
return(Observable.Defer(() =>
{
var roi = default(IplImage);
var mask = default(IplImage);
var currentRegions = default(Point[][]);
var boundingRegions = default(Rect[]);
return source.Select(input =>
{
var operation = Operation;
var output = new RegionActivityCollection();
mask = IplImageHelper.EnsureImageFormat(mask, input.Size, IplDepth.U8, 1);
if (operation != ReduceOperation.Sum)
{
roi = null;
}
else
{
roi = IplImageHelper.EnsureImageFormat(roi, input.Size, input.Depth, input.Channels);
}
if (Regions != currentRegions)
{
currentRegions = Regions;
if (currentRegions != null)
{
mask.SetZero();
CV.FillPoly(mask, currentRegions, Scalar.All(255));
boundingRegions = currentRegions.Select(polygon =>
{
var points = polygon.SelectMany(point => new[] { point.X, point.Y }).ToArray();
using (var mat = new Mat(1, polygon.Length, Depth.S32, 2))
{
Marshal.Copy(points, 0, mat.Data, points.Length);
return CV.BoundingRect(mat);
}
}).ToArray();
}
}
if (currentRegions != null)
{
var activeMask = mask;
if (roi != null)
{
roi.SetZero();
CV.Copy(input, roi, mask);
activeMask = roi;
}
var activation = ActivationFunction(operation);
for (int i = 0; i < boundingRegions.Length; i++)
{
var rect = boundingRegions[i];
var polygon = currentRegions[i];
using (var region = input.GetSubRect(rect))
using (var regionMask = activeMask.GetSubRect(rect))
{
output.Add(new RegionActivity
{
Roi = polygon,
Rect = rect,
Activity = activation(region, regionMask)
});
}
}
}
return output;
});
}));
}