public int Dot(Point3Di other)
{
int t1 = this.X * other.X;
int t2 = this.Y * other.Y;
int t3 = this.Z * other.Z;
return(t1 + t2 + t3);
}
public Point3Di Cross(Point3Di other)
{
int rx = this.Y * other.Z - this.Z * other.Y;
int ry = this.Z * other.X - this.X * other.Z;
int rz = this.X * other.Y - this.Y * other.X;
return(new Point3Di(rx, ry, rz));
}
// Returns the absolute difference between the pixels at pt1 and pt2 in images img1 and
// img2 respectively. pt1 must be within img1, and pt2 must be within img2.
public static int Compare(Image img1, Point2Di pt1, Image img2, Point2Di pt2)
{
Point3Di img1PixVal = img1.GetPixelValue(pt1);
Point3Di img2PixVal = img2.GetPixelValue(pt2);
return(Math.Abs(img1PixVal.X - img2PixVal.X) +
Math.Abs(img1PixVal.Y - img2PixVal.Y) +
Math.Abs(img1PixVal.Z - img2PixVal.Z));
}
// CHECKME calling compare from an instance could be more efficient - data cursors
// Returns the absolute difference between the pixels within the kernel centered around pt1
// and pt2 in img1 and img2 respectively. pt1 must be within img1, and pt2 must be within
// img2. The kernel must have odd dimensions. None of these conditions are checked, for
// efficiency.
public static double Compare(Image img1, Point2Di pt1, Image img2, Point2Di pt2,
double[][] kernel)
{
double errorSum = 0;
double weightsSum = 0;
int kernelHalfHeight = kernel.Length / 2;
int kernelHalfWidth = kernel[0].Length / 2;
// CHECKME enforce square kernel?
// Stores half of the actual width and height being used, rounded down. Each dimension
// is shrunk symmetrically until the kernel fits within the bounds of both images.
// Symmetry is to prevent skewing of the amount of information coming from each side of
// the center point.
int halfWidth = Util.Min(kernelHalfWidth, pt1.X, pt2.X,
img1.Width - pt1.X - 1, img2.Width - pt2.X - 1);
int halfHeight = Util.Min(kernelHalfHeight, pt1.Y, pt2.Y,
img1.Height - pt1.Y - 1, img2.Height - pt2.Y - 1);
int startX1 = pt1.X - halfWidth;
int startX2 = pt2.X - halfWidth;
int y1 = pt1.Y - halfHeight;
int y2 = pt2.Y - halfHeight;
for (int yOff = -halfHeight; yOff <= halfHeight; yOff++)
{
int x1 = startX1;
int x2 = startX2;
for (int xOff = -halfWidth; xOff <= halfWidth; xOff++)
{
int xKernel = kernelHalfWidth + xOff;
int yKernel = kernelHalfHeight + yOff;
double weight = kernel[yKernel][xKernel];
weightsSum += weight;
Point3Di pix1 = img1.GetPixelValue(x1, y1);
Point3Di pix2 = img2.GetPixelValue(x2, y2);
int error = Math.Abs(pix1.X - pix2.X) +
Math.Abs(pix1.Y - pix2.Y) +
Math.Abs(pix1.Z - pix2.Z);
errorSum += error * weight;
x1++;
x2++;
}
y1++;
y2++;
}
return(errorSum / weightsSum);
}
public override bool Equals(object obj)
{
if (obj == null)
{
return(false);
}
Point3Di other = obj as Point3Di;
if ((object)other == null)
{
return(false);
}
return((this.X == other.X) && (this.Y == other.Y) && (this.Z == other.Z));
}
