Text OcR

ocr.swift

// Hacked from: https://stackoverflow.com/questions/44533148/converting-a-vision-vntextobservation-to-a-string
// Ref: https://developer.apple.com/videos/play/wwdc2019/234/
import Vision
import UIKit

class OCRReader {
    func performOCR(recognitionLevel: VNRequestTextRecognitionLevel)  {
        let image = #imageLiteral(resourceName: "Hello.JPG")
        let requestHandler = VNImageRequestHandler(cgImage: image.cgImage!, options: [:])
        
        let request = VNRecognizeTextRequest  { (request, error) in
            if let error = error {
                print(error)
                return
            }
            
            guard let observations = request.results as? [VNRecognizedTextObservation] else { return }
            
            for currentObservation in observations {
                let topCandidate = currentObservation.topCandidates(1)
                if let recognizedText = topCandidate.first {
                    print("Result: ", recognizedText.string)
                }
            }
        }
        request.recognitionLevel = recognitionLevel
        
        try? requestHandler.perform([request])
    }
}

let revision = VNRecognizeTextRequest.currentRevision
let supported = try? VNRecognizeTextRequest.supportedRecognitionLanguages(for: VNRequestTextRecognitionLevel.fast, revision: 2)
print(supported)
print("Running...😆")
let ocrReader = OCRReader()
ocrReader.performOCR(recognitionLevel: .accurate)