public static int GetExamID(Bitmap bitmap)
{
var results = QrCodeEncoderDecoder.DecodeMultiple(bitmap);
if (results != null && results.Length > 0)
{
var res = results.FirstOrDefault();
if (int.TryParse(res.ToString().Split('/')?[0], out int result))
{
return(result);
}
}
return(0);
}
public static Bitmap ResizeToStandard(Bitmap bitmap)
{
var qrCodesPositions = QrCodeEncoderDecoder.DecodeMultiple(bitmap).ToList().OrderBy(x => x.ResultPoints.FirstOrDefault().Y).Select(x => x.ResultPoints.FirstOrDefault()).ToList();
if (qrCodesPositions.Count() == 3 && (qrCodesPositions[2].Y - (qrCodesPositions[1].Y + qrCodesPositions[0].Y)) < 0)
{
bitmap.RotateFlip(RotateFlipType.Rotate180FlipNone);
}
var qrCodesNewPositions = QrCodeEncoderDecoder.DecodeMultiple(bitmap).ToList().OrderBy(x => x.ResultPoints.FirstOrDefault().X).Select(x => x.ResultPoints).ToList();
var leftTopQRCode = qrCodesNewPositions.Take(2).OrderBy(x => x.FirstOrDefault().Y).FirstOrDefault().OrderBy(x => x.X + x.Y).FirstOrDefault();
var leftBottomQRCode = qrCodesNewPositions.Take(2).OrderByDescending(x => x.FirstOrDefault().Y).FirstOrDefault().OrderBy(x => x.X).FirstOrDefault();
var rightTopQRCode = qrCodesNewPositions[2].OrderByDescending(x => x.X).FirstOrDefault();
var source = new PointF[4];
source[0] = new PointF(leftTopQRCode.X, leftTopQRCode.Y);
source[1] = new PointF(leftBottomQRCode.X, leftBottomQRCode.Y);
source[2] = new PointF(rightTopQRCode.X, leftBottomQRCode.Y);
source[3] = new PointF(rightTopQRCode.X, rightTopQRCode.Y);
var topQRDistance = rightTopQRCode.X - leftBottomQRCode.X;
var leftQRDistance = leftBottomQRCode.Y - leftTopQRCode.Y;
int offsideX = (int)((topQRDistance / distanceBeetweenTopQRCodes) * standardLeftRightMarginPercentage);
int offsideTop = (int)((leftQRDistance / distanceBeetweenLeftQRCodes) * standardTopMarginPercentage);
int offsideBot = (int)((leftQRDistance / distanceBeetweenLeftQRCodes) * standardBottomMarginPercentage);
source[0] = addOffsideToPoint(source[0], -offsideX, -offsideTop, bitmap);
source[1] = addOffsideToPoint(source[1], -offsideX, offsideBot, bitmap);
source[2] = addOffsideToPoint(source[2], offsideX, offsideBot, bitmap);
source[3] = addOffsideToPoint(source[3], offsideX, -offsideTop, bitmap);
var target = new PointF[] {
new PointF(0, 0),
new PointF(0, standardDocumentHeight),
new PointF(standardDocumentWidth, standardDocumentHeight),
new PointF(standardDocumentWidth, 0)
};
using (var image = new Image <Gray, byte>(bitmap))
{
var tran = CvInvoke.GetPerspectiveTransform(source, target);
CvInvoke.WarpPerspective(image, image, tran, new Size((int)standardDocumentWidth, (int)standardDocumentHeight));
return(image.ToBitmap((int)standardDocumentWidth, (int)standardDocumentHeight));
}
}
