static CellLines DetectHorizontalLines(Mat binary, int hThreshold, int textSize)
{
CellLines horizontals = new CellLines();
using (Mat horizontal = binary.Clone())
using (Mat hKernel = Cv2.GetStructuringElement(shape: MorphShapes.Rect, ksize: new Size(hThreshold, SIZE_LINE)))
using (Mat kernelDilate = Cv2.GetStructuringElement(shape: MorphShapes.Rect, ksize: new Size(SIZE_DILATE, SIZE_DILATE)))
{
// horizontal
Cv2.Erode(src: horizontal, dst: horizontal, element: hKernel, anchor: new Point(-1, -1));
Cv2.Dilate(src: horizontal, dst: horizontal, element: hKernel, anchor: new Point(-1, -1));
// 중간에 살짝 끊어진 라인을 잇기 위해 라인을 확장시킨다.
Cv2.Dilate(src: horizontal, dst: horizontal, element: kernelDilate, anchor: new Point(-1, -1));
Point[][] horizontalContours;
HierarchyIndex[] horizontalHierarchy;
Cv2.FindContours(image: horizontal, contours: out horizontalContours, hierarchy: out horizontalHierarchy, mode: RetrievalModes.External, method: ContourApproximationModes.ApproxSimple, offset: new Point(0, 0));
int startX, startY, endX, endY, index = 0;
Rect rect;
for (int i = 0; i < horizontalHierarchy.Length; i++)
{
rect = Cv2.BoundingRect(curve: horizontalContours[i]);
startX = rect.X;
startY = rect.Y + (int)(rect.Height * 0.5);
endX = rect.X + rect.Width;
endY = startY;
if (rect.Width > textSize)
{
horizontals.Add(new CellLine(index: index++, startX: startX, startY: startY, endX: endX, endY: endY, thickness: rect.Height));
}
}
}
return(new CellLines(horizontals.OrderBy(line => line.CenterY)));
}
