/// <summary>
/// Return the segmentation-derived mask for the character.
/// This may optionally be grown by some pixels.
/// </summary>
public override void GetMask(out Rect r, ref Bytearray outmask, int index, int grow)
{
r = boxes.At1d(index).Grow(grow);
r.Intersect(new Rect(0, 0, labels.Dim(0), labels.Dim(1)));
if (fullheight)
{
r.y0 = 0;
r.y1 = labels.Dim(1);
}
int x = r.x0, y = r.y0, w = r.Width(), h = r.Height();
Intarray segs = segments.At1d(index);
outmask.Resize(w, h);
outmask.Fill(0);
for (int i = 0; i < w; i++)
{
for (int j = 0; j < h; j++)
{
int label = labels[x + i, y + j];
if (NarrayUtil.first_index_of(segs, label) >= 0)
{
outmask[i, j] = (byte)255;
}
}
}
if (grow > 0)
{
Morph.binary_dilate_circle(outmask, grow);
}
}
/// <summary>
/// Get a mask at a given location
/// </summary>
public override void GetMaskAt(ref Bytearray mask, int index, Rect b)
{
if (!(b.x0 > -1000 && b.x1 < 10000 && b.y0 > -1000 && b.y1 < 10000))
{
throw new Exception("CHECK: (b.Left > -1000 && b.Right < 10000 && b.Top > -1000 && b.Bottom < 10000)");
}
mask.Resize(b.Width(), b.Height());
mask.Fill(0);
Intarray segs = segments.At1d(index);
int w = b.Width(), h = b.Height();
for (int i = 0; i < w; i++)
{
int x = b.x0 + i;
unchecked
{
if ((uint)x >= labels.Dim(0))
{
continue;
}
}
for (int j = 0; j < h; j++)
{
int y = b.y0 + j;
unchecked
{
if (((uint)y) >= labels.Dim(1))
{
continue;
}
}
int label = labels[b.x0 + i, b.y0 + j];
if (NarrayUtil.first_index_of(segs, label) >= 0)
{
mask[i, j] = (byte)255;
}
}
}
}
public static void extract_holes(ref Bytearray holes, Bytearray binarized)
{
Intarray temp = new Intarray();
temp.Copy(binarized);
NarrayUtil.Sub(255, temp);
ImgLabels.label_components(ref temp);
int background = -1;
for (int i = 0; i < temp.Dim(0); i++)
{
if (temp[i, 0] != 0)
{
background = temp[i, 0];
break;
}
}
holes.MakeLike(temp);
holes.Fill((byte)0);
if (background <= 0)
{
throw new Exception("extract_holes: background must be more 0");
}
for (int i = 0; i < temp.Dim(0); i++)
{
for (int j = 0; j < temp.Dim(1); j++)
{
if (temp[i, j] > 0 && temp[i, j] != background)
{
holes[i, j] = 255;
}
}
}
/*fprintf(stderr, "segholes\n");
* dsection("segholes");
* dshow(holes, "y");*/
}