/// <summary>
/// Gradient approximation to fill hole - uses the 4 edges of a covering rectangle to fill each pixel based on its distance from them.
/// Throws error if hole touches the edges of the image.
/// </summary>
public void FillHoleApproximateGradient(Hole hole)
{
if (hole.CoveringRectangle.TopRight.Value == -1 ||
hole.CoveringRectangle.BottomLeft.Value == -1 ||
hole.CoveringRectangle.TopLeft.Value == -1 ||
hole.CoveringRectangle.BottomRight.Value == -1)
{
throw new Exception("Better-Approximation does not work if the hole touches the edges of the image.");
}
var horizontalDistance = hole.CoveringRectangle.BottomRight.Y - hole.CoveringRectangle.TopLeft.Y;
var verticalDistance = hole.CoveringRectangle.BottomRight.X - hole.CoveringRectangle.TopLeft.X;
foreach (var pix in hole.HolePixels)
{
var distanceToStart = DistanceMeasures.ChebyshevDistance(pix, hole.CoveringRectangle.TopLeft);
var distanceToEnd = DistanceMeasures.ChebyshevDistance(pix, hole.CoveringRectangle.BottomRight);
float pixValue;
if (distanceToStart <= distanceToEnd)
{
var valueY = (hole.CoveringRectangle.TopRight.Value - hole.CoveringRectangle.TopLeft.Value) *
(pix.Y - hole.CoveringRectangle.TopLeft.Y) / horizontalDistance;
var valueX = (hole.CoveringRectangle.BottomLeft.Value - hole.CoveringRectangle.TopLeft.Value) *
(pix.X - hole.CoveringRectangle.TopLeft.X) / verticalDistance;
pixValue = hole.CoveringRectangle.TopLeft.Value + valueX + valueY;
}
else
{
var valueY = (hole.CoveringRectangle.BottomLeft.Value - hole.CoveringRectangle.BottomRight.Value) *
(hole.CoveringRectangle.BottomRight.Y - pix.Y) / horizontalDistance;
var valueX = (hole.CoveringRectangle.TopRight.Value - hole.CoveringRectangle.BottomRight.Value) *
(hole.CoveringRectangle.BottomRight.X - pix.X) / verticalDistance;
pixValue = hole.CoveringRectangle.BottomRight.Value + valueX + valueY;
}
if (pixValue > 1)
{
pixValue = 1;
}
else if (pixValue < 0)
{
pixValue = 0;
}
pix.Value = pixValue;
}
_image.IsHoled = false;
}
public float GetWeight(Pixel x, Pixel y)
{
return(1 / (_e + (float)Math.Pow(DistanceMeasures.ChebyshevDistance(x, y), _z)));
}
