/*
* private static void TesseractDownloadLangFile(String folder, String lang)
* {
* String subfolderName = "tessdata";
* String folderName = System.IO.Path.Combine(folder, subfolderName);
* if (!System.IO.Directory.Exists(folderName))
* {
* System.IO.Directory.CreateDirectory(folderName);
* }
* String dest = System.IO.Path.Combine(folderName, String.Format("{0}.traineddata", lang));
* if (!System.IO.File.Exists(dest))
* using (System.Net.WebClient webclient = new System.Net.WebClient())
* {
* String source =
* String.Format("https://github.com/tesseract-ocr/tessdata/blob/4592b8d453889181e01982d22328b5846765eaad/{0}.traineddata?raw=true", lang);
*
* Console.WriteLine(String.Format("Downloading file from '{0}' to '{1}'", source, dest));
* webclient.DownloadFile(source, dest);
* Console.WriteLine(String.Format("Download completed"));
* }
* }*/
public override void ViewDidLoad()
{
base.ViewDidLoad();
RootElement root = Root;
root.UnevenRows = true;
UIImageView imageView = new UIImageView(View.Frame);
StringElement messageElement = new StringElement("");
StringElement licenseElement = new StringElement("");
root.Add(new Section()
{
new StyledStringElement("Process", delegate
{
String path = "tessdata";
messageElement.Value = String.Format("Checking Tesseract language data...");
try
{
LicensePlateDetector.TesseractDownloadLangFile(path, "eng");
LicensePlateDetector.TesseractDownloadLangFile(path, "osd");
}
catch (System.Net.WebException)
{
messageElement.Value =
String.Format(
"Failed to download Tesseract language file, please check internet connection.");
return;
}
catch (Exception e)
{
messageElement.Value = e.Message;
return;
}
messageElement.Value = String.Format("Checking Tesseract language data...");
using (Image <Bgr, Byte> image = new Image <Bgr, byte>("license-plate.jpg"))
{
LicensePlateDetector detector = new LicensePlateDetector(path);
Stopwatch watch = Stopwatch.StartNew(); // time the detection process
List <IInputOutputArray> licensePlateImagesList = new List <IInputOutputArray>();
List <IInputOutputArray> filteredLicensePlateImagesList = new List <IInputOutputArray>();
List <RotatedRect> licenseBoxList = new List <RotatedRect>();
List <string> words = detector.DetectLicensePlate(
image,
licensePlateImagesList,
filteredLicensePlateImagesList,
licenseBoxList);
watch.Stop(); //stop the timer
messageElement.Value = String.Format("{0} milli-seconds", watch.Elapsed.TotalMilliseconds);
StringBuilder builder = new StringBuilder();
foreach (String w in words)
{
builder.AppendFormat("{0} ", w);
}
licenseElement.Value = builder.ToString();
messageElement.GetImmediateRootElement().Reload(messageElement, UITableViewRowAnimation.Automatic);
licenseElement.GetImmediateRootElement().Reload(licenseElement, UITableViewRowAnimation.Automatic);
foreach (RotatedRect box in licenseBoxList)
{
image.Draw(box, new Bgr(Color.Red), 2);
}
Size frameSize = FrameSize;
using (Mat resized = new Mat())
{
CvInvoke.ResizeForFrame(image, resized, frameSize);
imageView.Image = resized.ToUIImage();
imageView.Frame = new RectangleF(PointF.Empty, resized.Size);
}
imageView.SetNeedsDisplay();
ReloadData();
}
}
)
});
root.Add(new Section("Recognition Time")
{
messageElement
});
root.Add(new Section("License Plate")
{
licenseElement
});
root.Add(new Section()
{
imageView
});
}
/*
* private static void TesseractDownloadLangFile(String folder, String lang)
* {
* String subfolderName = "tessdata";
* String folderName = System.IO.Path.Combine(folder, subfolderName);
* if (!System.IO.Directory.Exists(folderName))
* {
* System.IO.Directory.CreateDirectory(folderName);
* }
* String dest = System.IO.Path.Combine(folderName, String.Format("{0}.traineddata", lang));
* if (!System.IO.File.Exists(dest))
* using (System.Net.WebClient webclient = new System.Net.WebClient())
* {
* String source = Emgu.CV.OCR.Tesseract.GetLangFileUrl(lang);
*
* Console.WriteLine(String.Format("Downloading file from '{0}' to '{1}'", source, dest));
* webclient.DownloadFile(source, dest);
* Console.WriteLine(String.Format("Download completed"));
* }
* }*/
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
OnImagePicked += (sender, image) =>
{
if (image == null)
{
return;
}
String path = System.IO.Path.Combine(this.FilesDir.AbsolutePath, "tessdata");
try
{
SetProgressMessage("Checking Tesseract Lang files...");
LicensePlateDetector.TesseractDownloadLangFile(path, "eng");
LicensePlateDetector.TesseractDownloadLangFile(path, "osd");
SetProgressMessage("Please wait ...");
}
catch (System.Net.WebException e)
{
SetMessage("Unable to download tesseract language file from Internet, please check your Internet connection.");
Console.WriteLine(e);
return;
}
catch (Exception e)
{
SetMessage(e.ToString());
Console.WriteLine(e);
return;
}
LicensePlateDetector detector = new LicensePlateDetector(path + System.IO.Path.DirectorySeparatorChar);
Stopwatch watch = Stopwatch.StartNew(); // time the detection process
List <IInputOutputArray> licensePlateImagesList = new List <IInputOutputArray>();
List <IInputOutputArray> filteredLicensePlateImagesList = new List <IInputOutputArray>();
List <RotatedRect> licenseBoxList = new List <RotatedRect>();
List <string> words = detector.DetectLicensePlate(
image,
licensePlateImagesList,
filteredLicensePlateImagesList,
licenseBoxList);
watch.Stop(); //stop the timer
StringBuilder builder = new StringBuilder();
builder.Append(String.Format("{0} milli-seconds. ", watch.Elapsed.TotalMilliseconds));
foreach (String w in words)
{
builder.AppendFormat("{0} ", w);
}
SetMessage(builder.ToString());
foreach (RotatedRect box in licenseBoxList)
{
Rectangle rect = box.MinAreaRect();
CvInvoke.Rectangle(image, rect, new Bgr(System.Drawing.Color.Red).MCvScalar, 2);
}
SetImageBitmap(image.ToBitmap());
image.Dispose();
};
OnButtonClick += delegate
{
PickImage("license-plate.jpg");
};
}
