public static async Task <OCRData> Detect(IEditableImage Img, Context Ctx, int RectWidth, int RectHeight)
{
if (TesAPI == null)
{
TesAPI = new TesseractApi(Ctx, AssetsDeployment.OncePerInitialization);
await TesAPI.Init("eng");
TesAPI.SetVariable("tessedit_char_whitelist", "0123456789kmKM");
}
OCRData Result = new OCRData();
Result.PngOriginal = Img.ToPng();
// Crop the detection region
Img = Img.Crop((Img.Width / 2) - (RectWidth / 2), (Img.Height / 2) - (RectHeight / 2), RectWidth, RectHeight).ToMonochrome();
Result.PngCropped = Img.ToPng();
using (MemoryStream PngImage = new MemoryStream()) {
using (Bitmap Pic = ProcessImage((Bitmap)Img.GetNativeImage()))
await Pic.CompressAsync(Bitmap.CompressFormat.Png, 100, PngImage);
PngImage.Seek(0, SeekOrigin.Begin);
await TesAPI.SetImage(PngImage);
Result.PngProcessed = PngImage.ToArray();
}
Result.Text = TesAPI.Text;
return(Result);
}
async Task OnPicture(IEditableImage Img)
{
ShowLabel("Processing...");
int W = Img.Width;
int H = Img.Height;
OCRData OCRData = await OCR.Detect(Img, ApplicationContext, (int)(W * 0.52f), (int)(H * 0.13f));
OCR.SaveDebug(OCRData);
if (OCRData.TryParseKM(out int KM))
{
string KMFormat = string.Format("{0} km", KM);
ShowLabel(KMFormat);
RunOnUiThread(() => {
AlertDialog.Builder AlertBuilder = new AlertDialog.Builder(this);
AlertBuilder.SetTitle("Success");
AlertBuilder.SetMessage("Use the following? " + KMFormat);
AlertBuilder.SetPositiveButton("Yes", (S, E) => {
RunOnUiThread(() => {
ShowLabel("Fetching location...");
Kilometers = KM;
DoBeginLocoVoznja = true;
LocationManager LocMgr = (LocationManager)GetSystemService(LocationService);
LocMgr.RequestSingleUpdate(LocationManager.GpsProvider, this, Looper.MainLooper);
});
});
AlertBuilder.SetNegativeButton("No", (S, E) => {
ShowLabel("User cancelled");
});
AlertBuilder.Show();
});
}
else
{
ShowLabel(null);
ShowInfoDialog("Info", string.Format("Failed to parse km, got '{0}'", OCRData.Text ?? "none"));
}
}
public static void SaveDebug(OCRData OCRData)
{
string FolderPath = AEnv.ExternalStorageDirectory.AbsolutePath;
FolderPath = FilePath.Combine(FolderPath, "LocoVoznja_OCR");
if (!Directory.Exists(FolderPath))
{
Directory.CreateDirectory(FolderPath);
}
string FName = FilePath.Combine(FolderPath, Utils.GetCurrentTimeName() + ".zip");
using (FileStream FStream = new FileStream(FName, FileMode.Create)) {
ZipEntry Orig = new ZipEntry("orig.png", OCRData.PngOriginal);
ZipEntry Crop = new ZipEntry("crop.png", OCRData.PngCropped);
ZipEntry Proc = new ZipEntry("proc.png", OCRData.PngProcessed);
ZipEntry Info = new TextZipEntry("info.txt", OCRData.CreateInfoString());
ZipUtils.CreateZip(FStream, Orig, Crop, Proc, Info);
}
}