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);
}
public async void Sample4JpgWithSetVariable()
{
await _api.Init("eng");
_api.SetVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
using (var stream = LoadSample("sample4.jpg")) {
var result = await _api.SetImage(stream);
Assert.IsTrue(result);
Assert.IsTrue(_api.Text.Contains("Good font for the OCR"));
}
}
public async void Sample4JpgWithSetVariable()
{
await _api.Init("eng");
_api.SetVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
using (var stream = LoadSample("sample4.jpg")) {
var result = await _api.SetImage(stream);
Assert.IsTrue(result);
Assert.AreEqual(
"Good font for the OCR\nDingufrfom n Me am\nhe mm mm m cm\n\nGood 60m size for ocn\n\n", _api.Text);
}
}
