public async void Sample3AllModes()
{
foreach (var engineMode in Enum.GetValues(typeof(OcrEngineMode)))
{
Console.WriteLine("Engine mode: {0}", engineMode);
await _api.Init("eng", (OcrEngineMode)engineMode);
foreach (var segmentationMode in Enum.GetValues(typeof(PageSegmentationMode)))
{
_api.SetPageSegmentationMode((PageSegmentationMode)segmentationMode);
using (var stream = LoadSample("sample3.png")) {
var result = await _api.SetImage(stream);
Assert.IsTrue(result);
Console.WriteLine("Segmentation mode: {0}, result: \"{1}\"", segmentationMode,
_api.Text.Replace("\n", " "));
}
}
}
}
private async void initialize()
{
if (!_tesseractApi.Initialized)
{
await _tesseractApi.Init("spa");
_tesseractApi.SetPageSegmentationMode(PageSegmentationMode.SparseText);
string textPermited = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789,.;€:";
//abcdefghijklmnopqrstuvwxyz
_tesseractApi.SetWhitelist(textPermited);
}
}
public CalKnightsViewModel()
{
_tesseractApi = Resolver.Resolve <ITesseractApi>();
_device = Resolver.Resolve <IDevice>();
_dicts = new Dictionary <string, string>
{
{ "vanguard", "test" }
};
PickImageCommand = new Command(
execute: async() =>
{
ImageWaiting = false;
if (!_tesseractApi.Initialized)
{
await _tesseractApi.Init("kor", OcrEngineMode.TesseractOnly);
_tesseractApi.SetPageSegmentationMode(PageSegmentationMode.SparseText);
}
var imageFile = await TakePic();
if (imageFile != null)
{
//var imgStream = imageFile.GetStream();
//int imgLen = (int)imgStream.Length;
//var bytes = new byte[imgLen];
//imgStream.Position = 0;
//imgStream.Read(bytes, 0, imgLen);
//for (int i = 0; i < imgLen; i++)
// bytes[i] = (byte)(0xFF ^ bytes[i]);
//var memoryStream = new MemoryStream();
//await mediaFile.GetStream().CopyToAsync(memoryStream);
//byte[] imageAsByte = memoryStream.ToArray();
byte[] bytes;
using (Stream stream = imageFile.GetStream())
{
//await stream.CopyToAsync(memStream);
//memStream.Seek(0, SeekOrigin.Begin);
var bitmap = SKBitmap.Decode(stream);
var img = SKImage.FromBitmap(bitmap);
int height = img.Height;
int width = img.Width;
var subset = SKRectI.Create(
(int)(width * 0.2f), (int)(height * 0.4f),
(int)(width * 0.5f), (int)(height * 0.3f));
var placeholder = SKRectI.Empty;
var placeholder2 = SKPointI.Empty;
var img2 = img.ApplyImageFilter(
SKImageFilter.CreateColorFilter(_greyFilter),
subset, subset, out placeholder, out placeholder2);
if (img2 == null)
{
Debug.WriteLine("ISNULL");
}
img = img.Subset(subset);
bytes = img.Encode().ToArray();
OCRImageSource = ImageSource.FromStream(() =>
{
return(new MemoryStream(bytes));
});
}
// ImageSource.FromStream(() => { return imageFile.GetStream(); });
var tessResult = await _tesseractApi.SetImage(bytes);
if (tessResult)
{
Debug.WriteLine("read");
Debug.WriteLine(_tesseractApi.Text);
}
else
{
Debug.WriteLine("unavaliable");
}
}
ImageWaiting = true;
});
FoldSelectorCommand = new Command <string>(
execute: (string selector) =>
{
int i = 0;
switch (selector)
{
case "filter": i = 0; break;
case "tag": i = 1; break;
case "sort": i = 2; break;
}
_isFrameVisible[i] = !_isFrameVisible[i];
OnPropertyChanged("IsFrameVisible");
});
}
/// <summary>
/// Method for recognizing the characters. Input comes from the ScanPage.xaml.cs, and is then processed into words
/// </summary>
/// <param name="result">Stream of bytes of the picture to process</param>
/// <returns></returns>
private async Task Recognise(Stream result)
{
if (IsBusy)
{
return;
}
IsBusy = true;
if (result == null)
{
return;
}
if (!_tesseract.Initialized)
{
var initialised = await _tesseract.Init("deu");
_tesseract.SetWhitelist("0123456789");
_tesseract.SetPageSegmentationMode(PageSegmentationMode.SingleChar);
if (!initialised)
{
return;
}
}
bool success = await _tesseract.SetImage(result);
if (success)
{
var words = _tesseract.Results(PageIteratorLevel.Word);
var symbols = _tesseract.Results(PageIteratorLevel.Symbol);
var blocks = _tesseract.Results(PageIteratorLevel.Block);
var paragraphs = _tesseract.Results(PageIteratorLevel.Paragraph);
var lines = _tesseract.Results(PageIteratorLevel.Textline);
var textResult = "";
var enumerator = words.GetEnumerator();
while (enumerator.MoveNext())
{
var item = enumerator.Current.Text;
textResult += item;
}
bool isDigit = textResult.All(char.IsDigit);
if (!isDigit)
{
textResult = "?";
}
Reading += textResult;
}
else
{
Reading = "didnt work";
}
IsBusy = false;
}
public async void Sample3AllModes ()
{
using (_api = new TesseractApi (Android.App.Application.Context, AssetsDeployment.OncePerInitialization)) {
foreach (var engineMode in Enum.GetValues(typeof(OcrEngineMode))) {
Console.WriteLine ("Engine mode: {0}", engineMode);
await _api.Init ("eng", (OcrEngineMode)engineMode);
foreach (var segmentationMode in Enum.GetValues(typeof(PageSegmentationMode))) {
_api.SetPageSegmentationMode ((PageSegmentationMode)segmentationMode);
using (var stream = LoadSample ("sample3.png")) {
var result = await _api.SetImage (stream);
Assert.IsTrue (result);
Console.WriteLine ("Segmentation mode: {0}, result: \"{1}\"", segmentationMode, _api.Text.Replace ("\n", " "));
}
}
}
}
}