/// <summary>
/// Constructor.
/// </summary>
/// <param name="image">Color image in label image format</param>
/// <param name="dictionary">Color dictionary lookup for interpreting the colors in the source image into labels</param>
public unsafe LabelImage(RGBImage image, LabelDictionary dictionary)
{
_handler = new ShortArrayHandler(image.Rows, image.Columns, 1);
short index = 1;
short[, ,] lookup = new short[256, 256, 256];
if (dictionary != null)
{
Dictionary <Color, short> labelLookup = dictionary.LabelLookup;
foreach (Color c in labelLookup.Keys)
{
lookup[c.R, c.G, c.B] = labelLookup[c];
}
}
else
{
for (int R = 0; R < 256; R++)
{
for (int G = 0; G < 256; G++)
{
for (int B = 0; B < 256; B++)
{
lookup[R, G, B] = -1;
}
}
}
}
fixed(byte *imageSrc = image.RawArray)
{
fixed(short *labelsSrc = RawArray)
{
byte * imagePtr = imageSrc;
short *labelsPtr = labelsSrc;
int count = image.Rows * image.Columns;
while (count-- > 0)
{
byte R = *imagePtr++;
byte G = *imagePtr++;
byte B = *imagePtr++;
short label = lookup[R, G, B];
if (label < 0)
{
label = index;
lookup[R, G, B] = index++;
}
*labelsPtr++ = label;
}
}
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="rows">Number of rows in the image</param>
/// <param name="columns">Number of columns in the image</param>
public LabelImage(int rows, int columns)
{
_handler = new ShortArrayHandler(rows, columns, 1);
}
