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;
});
}));
}
public override IObservable <IplImage> Process(IObservable <IplImage> source)
{
return(Observable.Defer(() =>
{
var mask = default(IplImage);
var boundingBox = default(Rect);
var currentRegions = default(Point[][]);
return source.Select(input =>
{
if (Regions != currentRegions)
{
currentRegions = Regions;
boundingBox = default(Rect);
if (currentRegions != null)
{
mask = new IplImage(input.Size, IplDepth.U8, 1);
mask.SetZero();
var points = currentRegions
.SelectMany(region => region)
.SelectMany(point => new[] { point.X, point.Y })
.ToArray();
if (points.Length > 0)
{
using (var mat = new Mat(1, points.Length / 2, Depth.S32, 2))
{
Marshal.Copy(points, 0, mat.Data, points.Length);
boundingBox = CV.BoundingRect(mat);
boundingBox = ClipRectangle(boundingBox, input.Size);
}
CV.FillPoly(mask, currentRegions, Scalar.All(255));
if (cropOutput)
{
mask = mask.GetSubRect(boundingBox);
}
}
}
else
{
mask = null;
}
}
var selectionType = MaskType;
if (selectionType <= ThresholdTypes.BinaryInv)
{
var size = mask != null ? mask.Size : input.Size;
var output = new IplImage(size, IplDepth.U8, 1);
switch (selectionType)
{
case ThresholdTypes.Binary:
if (mask == null)
{
output.SetZero();
}
else
{
CV.Copy(mask, output);
}
break;
case ThresholdTypes.BinaryInv:
if (mask == null)
{
output.Set(Scalar.All(255));
}
else
{
CV.Not(mask, output);
}
break;
default:
throw new InvalidOperationException("Selection operation is not supported.");
}
return output;
}
if (currentRegions != null && boundingBox.Width > 0 && boundingBox.Height > 0)
{
var output = new IplImage(mask.Size, input.Depth, input.Channels);
var inputRoi = cropOutput ? input.GetSubRect(boundingBox) : input;
try
{
switch (selectionType)
{
case ThresholdTypes.ToZeroInv:
var fillRoi = cropOutput ? inputRoi : input;
CV.Copy(fillRoi, output);
output.Set(FillValue, mask);
break;
case ThresholdTypes.ToZero:
output.Set(FillValue);
CV.Copy(inputRoi, output, mask);
break;
default:
throw new InvalidOperationException("Selection operation is not supported.");
}
}
finally
{
if (inputRoi != input)
{
inputRoi.Close();
}
}
return output;
}
return input;
});
}));
}