processImage method
Function that takes InputImage processes it and returns a RecognisedText object.
Implementation
Future<RecognisedText> processImage(InputImage inputImage) async {
_hasBeenOpened = true;
final result = await Vision.channel.invokeMethod('vision#startTextDetector',
<String, dynamic>{'imageData': inputImage._getImageData()});
final recognisedText = RecognisedText.fromMap(result);
return recognisedText;
}