public Models.Geometry.Rectangle FindBoundsOfInnerImage()
{
// TODO: implement more robust algorithm
// TODO: add more tests for this method
const int minimalSegmentLength = 8;
var stripeCH = IntegerSegmentUtils.FindZeroSegments(FlatImage.GetDerivative(this.GetHorizontalStripe(this.Height / 2)), minimalSegmentLength);
var stripeCV = IntegerSegmentUtils.FindZeroSegments(FlatImage.GetDerivative(this.GetVerticalStripe(this.Width / 2)), minimalSegmentLength);
// TODO: optimize code
for (var iy = 1 * this.Height / 4; iy < 3 * this.Height / 4; iy += minimalSegmentLength)
{
stripeCH = IntegerSegmentUtils.IntersectionOfSegments(new[]
{
stripeCH,
FindHorizontalZeroSegments(iy, minimalSegmentLength)
});
}
for (var ix = 1 * this.Width / 4; ix < 3 * this.Width / 4; ix += minimalSegmentLength)
{
stripeCV = IntegerSegmentUtils.IntersectionOfSegments(new[]
{
stripeCV,
FindVerticalZeroSegments(ix, minimalSegmentLength)
});
}
if ((stripeCH.Count > 1) && (stripeCV.Count > 1))
{
var maxH = IntegerSegmentUtils.SegmentsWithMaxDistance(stripeCH);
var maxV = IntegerSegmentUtils.SegmentsWithMaxDistance(stripeCV);
return(new Geometry.Rectangle
{
X = maxH.Start + 1,
Y = maxV.Start + 1,
Width = maxH.End - maxH.Start - 2,
Height = maxV.End - maxV.Start - 2,
});
}
else
{
return(new Geometry.Rectangle());
}
}
private IList <IntegerSegment> FindVerticalZeroSegments(int ix, int minimalSegmentLength)
{
return(IntegerSegmentUtils.FindZeroSegments(FlatImage.GetDerivative(this.GetVerticalStripe(ix)), minimalSegmentLength));
}
private IList <IntegerSegment> FindHorizontalZeroSegments(int iy, int minimalSegmentLength)
{
return(IntegerSegmentUtils.FindZeroSegments(FlatImage.GetDerivative(this.GetHorizontalStripe(iy)), minimalSegmentLength));
}
