public static Mat PreprocessImageForTesseract(Mat img)
{
int scalePercent = 18;
int newWidth = (int)img.Width * scalePercent / 100;
int newHeight = (int)img.Height * scalePercent / 100;
CvInvoke.Resize(img, img, new System.Drawing.Size(newWidth, newHeight), interpolation: Inter.Area);
img = ImageProcessor.ApplyBlur(img, 0, 3);
Mat output = new Mat(img.Size, DepthType.Cv8U, 3);
CvInvoke.CvtColor(img, img, ColorConversion.Bgr2Gray);
//CvInvoke.EqualizeHist(img, img);
CvInvoke.BitwiseNot(img, img);
//img = ImageProcessor.CannyEdgeDetection(img, 20, 20);
//img = ImageProcessor.ApplyErosion(img, 3);
//CvInvoke.GaussianBlur(img, img, new System.Drawing.Size(3, 3), 0);
CvInvoke.AdaptiveThreshold(img, img, 255, AdaptiveThresholdType.GaussianC, ThresholdType.Binary, 11, 2);
CvInvoke.Threshold(img, output, 0, 255, ThresholdType.Otsu);//double ret =
//output = ImageProcessor.ApplyErosion(output, 3);
//CvInvoke.Threshold(output, output, ret, 255, ThresholdType.Binary);
var kernel = CvInvoke.GetStructuringElement(Emgu.CV.CvEnum.ElementShape.Rectangle, new System.Drawing.Size(2, 2), new System.Drawing.Point(-1, -1));
CvInvoke.Dilate(output, output, kernel, new System.Drawing.Point(-1, -1), 2, Emgu.CV.CvEnum.BorderType.Constant, default(MCvScalar));
//output = ImageProcessor.ApplyDilation(output, 7);
//CvInvoke.Invert()
return(output);
}
private void BtnPreviewTemplate_Click(object sender, RoutedEventArgs e)
{
if (parent.currentScreen != null)
{
Mat img = parent.selectedScreen;//CvInvoke.Imread("test_save.jpg", Emgu.CV.CvEnum.LoadImageType.Grayscale);
Mat warp = new Mat(img.Size, Emgu.CV.CvEnum.DepthType.Cv8U, 1);
img.CopyTo(warp);
img = ImageProcessor.ApplyBlur(img, 0, 3);
img = ImageProcessor.CannyEdgeDetection(img, lowThreshold, highThreshold);
img = ImageProcessor.ApplyDilation(img, 3);
img = ImageProcessor.ApplyErosion(img, 3);
LineSegment2D[] lines = ImageProcessor.HoughLines(img, rho, houghThreshold, minLineLength, maxLineGap);
LineSegment2D[] singleLines = Utils.GetSingleLinesFromHoughLines(lines, 20);
if (singleLines != null)
{
Mat mask = ImageProcessor.AddLines(singleLines, Utils.GetRatioOfSelectedArea(Utils.GetPoints(parent.currentScreen.coordinates)));
Mat templateImage = ImageProcessor.ApplyMask(warp, mask);
parent.template.SetTemplateImageAndMask(templateImage.ToImage <Bgr, byte>(), mask.ToImage <Bgr, byte>());
tempImage.Source = Utils.ToBitmapSource(templateImage);
templateMask.Source = Utils.ToBitmapSource(mask);
//lblTemplateName.Visibility = Visibility.Visible;
//txtTemplateName.Visibility = Visibility.Visible;
btnSaveTemplate.Visibility = Visibility.Visible;
}
else
{
MessageBox.Show("Couldn't find any lines with the specified parameters");
InitImages();
}
}
else
{
MessageBox.Show("You didn't select any screen! ", "Warning", MessageBoxButton.OK, MessageBoxImage.Warning);
}
}