private MetaRect[] ClassifyRectangles(Quadrilateral[] rects)
{
var metaRects = new MetaRect[rects.Length];
// Classify rectangles by its orientation and size.
for (var i = 0; i < rects.Length; i++)
{
var subrectWidth = rects[i].Width;
var subrectHeight = rects[i].Height;
// Filter markers by size.
if ((subrectWidth > _imageSize.Width * 0.08 && subrectHeight > _imageSize.Height * 0.08) ||
(subrectWidth < _imageSize.Width * 0.03 || subrectHeight < _imageSize.Height * 0.03))
{
continue;
}
var wtoh = subrectWidth / subrectHeight;
var htow = subrectHeight / subrectWidth;
var metaRect = new MetaRect
{
Rect = rects[i],
IsHorizontalLongMarker = (wtoh > 2.0f) && (wtoh < 4.5f),
IsVerticalLongMarker = (htow > 2.0f) && (htow < 4.5f)
};
metaRects[i] = metaRect;
}
return(metaRects);
}
private InternalTagDetectionResult ExtraMarkerCheck(MarkersOrientation detectedMarkersOrientation, MetaRect[] metaRects, int ri1, int ri2)
{
var confidence = 0.5D;
var r1 = metaRects[ri1];
var r2 = metaRects[ri2];
MetaRect rX = new MetaRect();
for (var ri3 = 0; ri3 < metaRects.Length; ri3++)
{
if (ri3 == ri1 || ri3 == ri2)
{
continue;
}
var r3 = metaRects[ri3];
if ((r3.IsHorizontalLongMarker || r3.IsVerticalLongMarker) && r3.Rect.MaxY > _imageSize.Height * 0.75)
{
if (r3.Rect.MinX < _imageSize.Width * 0.3 &&
Math.Abs(r3.Rect.MinX - r1.Rect.MinX) < _pixelToleranceWidth)
{
if ((detectedMarkersOrientation == MarkersOrientation.VV && r3.IsHorizontalLongMarker) ||
(detectedMarkersOrientation == MarkersOrientation.HH && r3.IsVerticalLongMarker) ||
(detectedMarkersOrientation == MarkersOrientation.VH && r3.IsVerticalLongMarker) ||
(detectedMarkersOrientation == MarkersOrientation.HV && r3.IsHorizontalLongMarker))
{
confidence += 0.15D;
if (!rX.Rect.IsEmpty && rX.Rect.MaxX > _imageSize.Width * 0.7)
{
if (Math.Abs(r3.Rect.MaxY - rX.Rect.MaxY) < _pixelToleranceHeight)
{
confidence += 0.2D;
}
break;
}
rX = r3;
}
}
if (r3.Rect.MaxX > _imageSize.Width * 0.7 &&
Math.Abs(r3.Rect.MaxX - r2.Rect.MaxX) < _pixelToleranceWidth)
{
if ((detectedMarkersOrientation == MarkersOrientation.VV && r3.IsHorizontalLongMarker) ||
(detectedMarkersOrientation == MarkersOrientation.HH && r3.IsVerticalLongMarker) ||
(detectedMarkersOrientation == MarkersOrientation.VH && r3.IsHorizontalLongMarker) ||
(detectedMarkersOrientation == MarkersOrientation.HV && r3.IsVerticalLongMarker))
{
confidence += 0.15D;
if (!rX.Rect.IsEmpty && rX.Rect.MinX < _imageSize.Width * 0.3)
{
if (Math.Abs(r3.Rect.MaxY - rX.Rect.MaxY) < _pixelToleranceHeight)
{
confidence += 0.2D;
}
break;
}
rX = r3;
}
}
}
}
return(new InternalTagDetectionResult {
Orientation = detectedMarkersOrientation, Confidence = confidence
});
}
