public DataMatrixExtraction(Bitmap sourceImage, FinderPatternPair fpp)
{
this.fpp = fpp;
PointF p1 = fpp.p1.X < fpp.p2.X ? fpp.p1.ToF() : fpp.p2.ToF();
PointF p2 = fpp.p1.X < fpp.p2.X ? fpp.p2.ToF() : fpp.p1.ToF();
PointF vect = PointOps.Mult(PointOps.Sub(p2, p1), 0.1f);
float unit = (float)PointOps.Distance(vect);
PointF normX = PointOps.Normalize(vect);
angX = Math.Atan2(normX.Y, normX.X);
double angY = angX - Math.PI / 2;
PointF normY = new PointF((float)Math.Cos(angY), (float)Math.Sin(angY));
topLeft = PointOps.Add(p1, PointOps.Add(PointOps.Mult(normX, unit), PointOps.Mult(normY, unit)));
bottomLeft = PointOps.Add(p1, PointOps.Sub(PointOps.Mult(normX, unit), PointOps.Mult(normY, unit)));
topRight = PointOps.Add(p1, PointOps.Add(PointOps.Mult(normX, unit * 9), PointOps.Mult(normY, unit)));
bottomRight = PointOps.Add(p1, PointOps.Sub(PointOps.Mult(normX, unit * 9), PointOps.Mult(normY, unit)));
rotatedMatrix = new Bitmap((int)Math.Ceiling(unit * 8), (int)Math.Ceiling(unit * 2), PixelFormat.Format32bppArgb);
Graphics rotG = Graphics.FromImage(rotatedMatrix);
rotG.RotateTransform((float)(-angX * 180 / Math.PI));
float diagonal = (float)PointOps.Distance(p1, p2);
rotG.DrawImage(
sourceImage,
new RectangleF(-diagonal, -diagonal, diagonal * 2, diagonal * 2),
new RectangleF(topLeft.X - diagonal, topLeft.Y - diagonal, diagonal * 2, diagonal * 2),
GraphicsUnit.Pixel);
rotG.Dispose();
int[] cellSum = new int[DataMatrixDrawer.rowCount * DataMatrixDrawer.columnCount];
unsafe {
BitmapData bd = rotatedMatrix.LockBits(ImageLockMode.ReadOnly);
byte * ptr = (byte *)bd.Scan0.ToPointer();
for (int y = 0; y < rotatedMatrix.Height; y++)
{
for (int x = 0; x < rotatedMatrix.Width; x++)
{
int cx = (int)Math.Floor((float)x * DataMatrixDrawer.columnCount / rotatedMatrix.Width);
int cy = (int)Math.Floor((float)y * DataMatrixDrawer.rowCount / rotatedMatrix.Height);
cellSum[cy * DataMatrixDrawer.columnCount + cx] += *ptr;
ptr += 4;
}
}
rotatedMatrix.UnlockBits(bd);
}
double threshold = ValueClustering.DivThreshold(cellSum);
extractedData = new bool[DataMatrixDrawer.rowCount * DataMatrixDrawer.columnCount];
for (int q = 0; q < DataMatrixDrawer.rowCount * DataMatrixDrawer.columnCount; q++)
{
extractedData[q] = cellSum[q] < threshold;
}
}
/*
* Locates top-left cell corner at `x` column and `y` row.
*/
public PointF GetTopLeftCellCorner(int x, int y)
{
PointF p = origin;
for (int q = 0; q < x; q++)
{
p = PointOps.Add(p, PointOps.Mult(horizontalNormal, columnWidths[q]));
}
for (int q = 0; q < y; q++)
{
p = PointOps.Add(p, PointOps.Mult(verticalNormal, rowHeights[q]));
}
return(p);
}
/*
* Draw a table on provided graphics canvas with provided pen.
*/
public void DrawTable(Graphics g, Pen p)
{
PointF row = PointOps.Mult(horizontalNormal, totalWidth);
PointF r = origin;
g.DrawLine(p, r, PointOps.Add(r, row));
for (int q = 0; q < rowHeights.Count; q++)
{
r = PointOps.Add(r, PointOps.Mult(verticalNormal, rowHeights[q]));
g.DrawLine(p, r, PointOps.Add(r, row));
}
PointF col = PointOps.Mult(verticalNormal, totalHeight);
PointF c = origin;
g.DrawLine(p, c, PointOps.Add(c, col));
for (int q = 0; q < columnWidths.Count; q++)
{
c = PointOps.Add(c, PointOps.Mult(horizontalNormal, columnWidths[q]));
g.DrawLine(p, c, PointOps.Add(c, col));
}
}