private void GetTrackingPoints(FastBitmap img, EyeData leftEye, EyeData rightEye)
{
const int YDownShift = 30;
const int XExpand = 5;
const float eyebrowMult = 0.6f;
int eyebrowWidth = (int)Math.Abs((leftEye.loc.X - rightEye.loc.X) * eyebrowMult);
Rectangle searchArea = new Rectangle();
FastBitmap smoothed = img.GaussianSmooth(5);
FastBitmap sobel = smoothed.SobelGradient();
smoothed.Dispose();
searchArea.Y = Math.Max(leftEye.loc.Y, rightEye.loc.Y) + YDownShift;
searchArea.X = leftEye.loc.X - XExpand;
searchArea.Width = rightEye.loc.X - leftEye.loc.X + (2 * XExpand);
searchArea.Height = (int)((rightEye.loc.X - leftEye.loc.X) * 0.6f);
float[,] trackingPointScores = new float[searchArea.Width, searchArea.Height];
for (int x = searchArea.Left; x < searchArea.Right; ++x)
{
for (int y = searchArea.Top; y < searchArea.Bottom; ++y)
{
float score = 0;
for (int i = 0; i < TrackingPointWidth; ++i)
{
for (int j = 0; j < TrackingPointWidth; ++j)
{
score += sobel.GetIntensity(x + i, y + j);
}
}
trackingPointScores[x - searchArea.Left, y - searchArea.Top] = score;
}
}
mouseTrackingPoint = GetBestTrackingPointWithinColumn(trackingPointScores, searchArea, (leftEye.loc.X + rightEye.loc.X) / 2);
leftEyeTrackingPoint = GetBestTrackingForEye(sobel, leftEye, eyebrowWidth);
rightEyeTrackingPoint = GetBestTrackingForEye(sobel, rightEye, eyebrowWidth);
sobel.Dispose();
}