private void RemovePerspective(OLSRegression regression)
{
float tBit = 300;
float B = regression.B;
float A = regression.A;
float x1 = A * (tBit / (B + tBit));
float x2 = A + ((400 - A) * (B / (B + tBit)));
PointF[] srcs = new PointF[4];
srcs[0] = new PointF((float)x1, 0);
srcs[1] = new PointF((float)x2, 0);
srcs[2] = new PointF(400, tBit);
srcs[3] = new PointF(0, tBit);
PointF[] dsts = new PointF[4];
dsts[0] = new PointF(0, 0);
dsts[1] = new PointF(400, 0);
dsts[2] = new PointF(400, 300);
dsts[3] = new PointF(0, 300);
HomographyMatrix warpMat = CameraCalibration.GetPerspectiveTransform(srcs, dsts);
WarpedImage = BoardImage.WarpPerspective(warpMat, 400, 300,
Emgu.CV.CvEnum.INTER.CV_INTER_CUBIC,
Emgu.CV.CvEnum.WARP.CV_WARP_FILL_OUTLIERS,
GetBottomBorderColor(BoardImage));
m_InverseWarpMatrix = CameraCalibration.GetPerspectiveTransform(dsts, srcs);
//WarpedImage = WarpedImage.WarpPerspective(m_InverseWarpMatrix, 400, 300,
// Emgu.CV.CvEnum.INTER.CV_INTER_CUBIC,
// Emgu.CV.CvEnum.WARP.CV_WARP_FILL_OUTLIERS,
// GetBottomBorderColor(BoardImage));
}
internal OLSRegression GetBoardRegression()
{
List<FullLine> fullLines = new List<FullLine>();
foreach (LineSegment2D lineSegment in VertLines)
{
// Set lowest point as p1
var p1 = lineSegment.P1;
var p2 = lineSegment.P2;
if (p1.Y > p2.Y)
{
p2 = lineSegment.P1;
p1 = lineSegment.P2;
}
// Calculate crossing of x-axis (call it c)
float m = (float)(p2.X - p1.X) / (float)(p2.Y - p1.Y);
float c = (float)p1.X - ((float)p1.Y * m);
FullLine fullLine = new FullLine(m, c);
fullLines.Add(fullLine);
}
OLSRegression olsRegression = new OLSRegression();
olsRegression.Perform(fullLines.ToArray());
return olsRegression;
}