/// <summary> Get skew angle of image, how much degree have to be rotated to its text will be straight </summary>
/// <param name="bitmapSource">image for which will be skew angle computed</param>
/// <returns>Angle, how much degrees is image rotated from normal position</returns>
/// <remarks>This is only method that uses GDI+ and does not use BitmapSource</remarks>
public static double GetDeskewAngle(BitmapSource bitmapSource)
{
double skewangle;
using (MemoryStream ms = new MemoryStream())
{
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmapSource));
encoder.Save(ms);
ms.Position = 0;
System.Drawing.Bitmap bmpIn = new System.Drawing.Bitmap(ms);
Deskew sk = new Deskew(bmpIn);
skewangle = sk.GetSkewAngle();
bmpIn.Dispose();
}
return(skewangle);
}
/// <summary> Deskew the image (rotate), so its text will be straight </summary>
/// <param name="bitmapSource">source image that will be deskewed</param>
/// <returns>Rotated BitmapSource</returns>
/// <remarks>This is only method that uses GDI+</remarks>
public static BitmapSource DeskewImage(BitmapSource bitmapSource, double skewAngle)
{
System.Drawing.Bitmap bmpOut;
BitmapSource output;
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
BitmapFrame frame = BitmapFrame.Create(bitmapSource);
encoder.Frames.Add(frame);
using (MemoryStream ms = new MemoryStream())
{
encoder.Save(ms);
ms.Position = 0;
System.Drawing.Bitmap bmpIn = new System.Drawing.Bitmap(ms);
Deskew sk = new Deskew(bmpIn);
bmpOut = sk.RotateImage(bmpIn, -skewAngle);
bmpIn.Dispose();
}
using (MemoryStream ms = new MemoryStream())
{
bmpOut.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
bmpOut.Dispose();
output = LoadFullSize(ms);
}
//copy pixels to new bitmapSource because of strange .NET native memory leak
int stride = output.PixelWidth * output.Format.BitsPerPixel / 8;
byte[] bitmapArray = new byte[output.PixelHeight * stride];
output.CopyPixels(bitmapArray, stride, 0);
return(BitmapSource.Create(output.PixelWidth, output.PixelHeight, output.DpiX, output.DpiY, output.Format,
output.Palette, bitmapArray, stride));
}
