/// <summary>
/// Can be used to implement flood fill.
/// </summary>
public static bool FloodFillCondition(CVImage frame, Point startPt, Point candidatePt, int tolerange)
{
if (!frame.Contains(candidatePt) || !frame.Contains(startPt))
{
return(false);
}
return(Math.Abs(frame[startPt].GrayLevel - frame[candidatePt].GrayLevel) <= tolerange);
}
/// <summary>
/// Implements an 8-connected region growing algorithm based on histogram similarity (using back projection).
/// Starts with the starting pixel and checks in the back projection all the four pixel around it.
/// If the pixels pass some threshold, they are selected and the region is grown to contain them as well.
/// </summary>
public static void Fill(Point startPoint, CVImage outputImage,
RegionGrowingCriteria criteria, object criteriaCookie,
LabelingFunc labelFunc, object labelingCookie)
{
// first, include the starting pixel in the region.
labelFunc(outputImage, startPoint, labelingCookie);
// go over all the connection points.
foreach (Point connection in connections)
{
Point connectionPoint = new Point(
startPoint.X + (int)connection.X,
startPoint.Y + (int)connection.Y);
if (!outputImage.Contains(connectionPoint))
{
continue;
}
// consider this point only if it's not already in the region.
if (outputImage[connectionPoint].GrayLevel != 0)
{
continue;
}
// only if growing criteria is met, recurse away.
if (criteria(startPoint, connectionPoint, criteriaCookie))
{
// recurse into the new connection point.
Fill(connectionPoint, outputImage, criteria, criteriaCookie, labelFunc, labelingCookie);
}
}
}
/// <summary>
/// Can be used in the call to Fill() as the default labeling function.
/// This function merely colors the pixel in the color specified under labelCookie
/// which should be a Color object.
/// </summary>
public static void DefaultLabeling(CVImage outputImage, Point pt, object labelCookie)
{
if (!outputImage.Contains(pt)) return;
if (outputImage[pt].GrayLevel != 0) return;
Color c = (Color)labelCookie;
outputImage[pt] = new CVRgbPixel(c);
}
/// <summary>
/// Can be used in the call to Fill() as the default labeling function.
/// This function merely colors the pixel in the color specified under labelCookie
/// which should be a Color object.
/// </summary>
public static void DefaultLabeling(CVImage outputImage, Point pt, object labelCookie)
{
if (!outputImage.Contains(pt))
{
return;
}
if (outputImage[pt].GrayLevel != 0)
{
return;
}
Color c = (Color)labelCookie;
outputImage[pt] = new CVRgbPixel(c);
}
/// <summary>
/// Implements an 8-connected region growing algorithm based on histogram similarity (using back projection).
/// Starts with the starting pixel and checks in the back projection all the four pixel around it.
/// If the pixels pass some threshold, they are selected and the region is grown to contain them as well.
/// </summary>
public static void Fill(Point startPoint, CVImage outputImage,
RegionGrowingCriteria criteria, object criteriaCookie,
LabelingFunc labelFunc, object labelingCookie)
{
// first, include the starting pixel in the region.
labelFunc(outputImage, startPoint, labelingCookie);
// go over all the connection points.
foreach (Point connection in connections)
{
Point connectionPoint = new Point(
startPoint.X + (int)connection.X,
startPoint.Y + (int)connection.Y);
if (!outputImage.Contains(connectionPoint))
continue;
// consider this point only if it's not already in the region.
if (outputImage[connectionPoint].GrayLevel != 0) continue;
// only if growing criteria is met, recurse away.
if (criteria(startPoint, connectionPoint, criteriaCookie))
{
// recurse into the new connection point.
Fill(connectionPoint, outputImage, criteria, criteriaCookie, labelFunc, labelingCookie);
}
}
}
/// <summary>
/// Can be used to implement flood fill.
/// </summary>
public static bool FloodFillCondition(CVImage frame, Point startPt, Point candidatePt, int tolerange)
{
if (!frame.Contains(candidatePt) || !frame.Contains(startPt)) return false;
return Math.Abs(frame[startPt].GrayLevel - frame[candidatePt].GrayLevel) <= tolerange;
}
