/// <summary>
/// A valid line segmentation may contain 0 or 0xffffff as the
/// background, and otherwise numbers components starting at 1.
/// The segmentation consists of segmented background pixels
/// (0x80xxxx) and segmented foreground pixels (0x00xxxx). The
/// segmented foreground pixels should constitute a usable
/// binarization of the original image.
/// </summary>
public static void check_line_segmentation(Intarray cseg)
{
if (cseg.Length1d() == 0)
{
return;
}
if (cseg.Rank() != 2)
{
throw new Exception("check_line_segmentation: rank must be 2");
}
for (int i = 0; i < cseg.Length1d(); i++)
{
int value = cseg.At1d(i);
if (value == 0)
{
continue;
}
if (value == 0xffffff)
{
continue;
}
if ((value & 0x800000) > 0)
{
if ((value & ~0x800000) > 100000)
{
throw new Exception("check_line_segmentation: (value & ~0x800000) > 100000");
}
}
else
if (value > 100000)
{
throw new Exception("check_line_segmentation: value > 100000");
}
}
}