private static Rectangle FindBarcodeRectangle(Bitmap bitmap, ResultPoint[] resultPoints)
{
var startX = resultPoints[0].X;
float startY;
var width = resultPoints[1].X - resultPoints[0].X;
float height;
var luminanceSource = new BitmapLuminanceSource(bitmap);
var binarizer = new HybridBinarizer(luminanceSource);
var bitMatrix = binarizer.BlackMatrix;
var whiteRectangleDetector = WhiteRectangleDetector.Create(bitMatrix);
var whiteRectanblePoints = whiteRectangleDetector.detect();
if (whiteRectanblePoints != null)
{
height = whiteRectanblePoints[3].Y - whiteRectanblePoints[0].Y;
startY = whiteRectanblePoints[0].Y;
}
else
{
height = 1;
startY = resultPoints[0].Y;
}
var barcodeRectangle = new Rectangle((int)startX, (int)startY, (int)width, (int)height);
return(barcodeRectangle);
}
/// <summary>
/// Finds a candidate center point of an Aztec code from an image
/// </summary>
/// <returns>the center point</returns>
private Point getMatrixCenter()
{
ResultPoint pointA;
ResultPoint pointB;
ResultPoint pointC;
ResultPoint pointD;
int cx;
int cy;
//Get a white rectangle that can be the border of the matrix in center bull's eye or
var whiteDetector = WhiteRectangleDetector.Create(image);
if (whiteDetector == null)
return null;
ResultPoint[] cornerPoints = whiteDetector.detect();
if (cornerPoints != null)
{
pointA = cornerPoints[0];
pointB = cornerPoints[1];
pointC = cornerPoints[2];
pointD = cornerPoints[3];
}
else
{
// This exception can be in case the initial rectangle is white
// In that case, surely in the bull's eye, we try to expand the rectangle.
cx = image.Width/2;
cy = image.Height/2;
pointA = getFirstDifferent(new Point(cx + 7, cy - 7), false, 1, -1).toResultPoint();
pointB = getFirstDifferent(new Point(cx + 7, cy + 7), false, 1, 1).toResultPoint();
pointC = getFirstDifferent(new Point(cx - 7, cy + 7), false, -1, 1).toResultPoint();
pointD = getFirstDifferent(new Point(cx - 7, cy - 7), false, -1, -1).toResultPoint();
}
//Compute the center of the rectangle
cx = MathUtils.round((pointA.X + pointD.X + pointB.X + pointC.X) / 4.0f);
cy = MathUtils.round((pointA.Y + pointD.Y + pointB.Y + pointC.Y) / 4.0f);
// Redetermine the white rectangle starting from previously computed center.
// This will ensure that we end up with a white rectangle in center bull's eye
// in order to compute a more accurate center.
whiteDetector = WhiteRectangleDetector.Create(image, 15, cx, cy);
if (whiteDetector == null)
return null;
cornerPoints = whiteDetector.detect();
if (cornerPoints != null)
{
pointA = cornerPoints[0];
pointB = cornerPoints[1];
pointC = cornerPoints[2];
pointD = cornerPoints[3];
}
else
{
// This exception can be in case the initial rectangle is white
// In that case we try to expand the rectangle.
pointA = getFirstDifferent(new Point(cx + 7, cy - 7), false, 1, -1).toResultPoint();
pointB = getFirstDifferent(new Point(cx + 7, cy + 7), false, 1, 1).toResultPoint();
pointC = getFirstDifferent(new Point(cx - 7, cy + 7), false, -1, 1).toResultPoint();
pointD = getFirstDifferent(new Point(cx - 7, cy - 7), false, -1, -1).toResultPoint();
}
// Recompute the center of the rectangle
cx = MathUtils.round((pointA.X + pointD.X + pointB.X + pointC.X) / 4.0f);
cy = MathUtils.round((pointA.Y + pointD.Y + pointB.Y + pointC.Y) / 4.0f);
return new Point(cx, cy);
}
/// <summary>
/// Initializes a new instance of the <see cref="Detector"/> class.
/// </summary>
/// <param name="image">The image.</param>
public Detector(BitMatrix image)
{
this.image = image;
rectangleDetector = WhiteRectangleDetector.Create(image);
}