void UseTextRecognitionModel()
{
VisionTextRecognizer textRecognizer;
if (currentApiResource == ApiResource.OnDevice)
{
textRecognizer = vision.GetOnDeviceTextRecognizer();
}
else
{
// To provide language hints to assist with language detection:
// See https://cloud.google.com/vision/docs/languages for supported languages
var options = new VisionCloudTextRecognizerOptions {
LanguageHints = new [] { "es" }
};
textRecognizer = vision.GetCloudTextRecognizer(options);
}
var image = new VisionImage(ImgSample.Image);
textRecognizer.ProcessImage(image, HandleVisionTextRecognitionCallback);
void HandleVisionTextRecognitionCallback(VisionText text, NSError error)
{
TxtData.Text = error?.Description ?? text?.Text;
}
}
/// <summary>
/// <see cref="LabelReaderBase.GetFullTextFromImage(object)"/>
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public override async Task <string> GetFullTextFromImageAsync(object image)
{
CoreMedia.CMSampleBuffer iOSImage = (CoreMedia.CMSampleBuffer)image;
VisionImage visionImage = new VisionImage(iOSImage);
visionImage.Metadata = new VisionImageMetadata {
Orientation = GetOrientation()
};
VisionApi api = VisionApi.Create();
VisionTextRecognizer textRecognizer = api.GetOnDeviceTextRecognizer();
VisionText textResult = await textRecognizer.ProcessImageAsync(visionImage);
return(textResult?.Text);
}