前言
想研究一下 apple 自带的 OCR 接口，查了点资料后，感觉效果还挺不错的～
实现
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| import Vision
func processImage() {
guard let cgImage = UIImage(named: "snapshot")?.cgImage else { return }
let requestHandler = VNImageRequestHandler(cgImage: cgImage)
let request = VNRecognizeTextRequest(completionHandler: recognizeTextHandler)
request.recognitionLevel = .accurate // 采用精确路径
request.recognitionLanguages = ["zh-Hans", "en-US"] // 设置识别的语言
do {
try requestHandler.perform([request])
} catch {
print("Unable to perform the requests: \(error).")
}
}
func recognizeTextHandler(request: VNRequest, error: Error?) {
guard let observations =
request.results as? [VNRecognizedTextObservation] else {
return
}
let recognizedStrings = observations.compactMap { observation in
return observation.topCandidates(1).first?.string
}
print(recognizedStrings.joined(separator: " "))
}
|
识别二维码
如果想要识别二维码的话，可以这么做
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| let barcodeRequest = VNDetectBarcodesRequest(completionHandler: { request, error in
guard let results = request.results else { return }
for result in results {
if let barcode = result as? VNBarcodeObservation {
/// 二维码内容
print(barcode.payloadStringValue)
print("Symbology: \(barcode.symbology.rawValue)")
if let desc = barcode.barcodeDescriptor as? CIQRCodeDescriptor {
let content = String(data: desc.errorCorrectedPayload, encoding: .utf8)
print("Payload: \(String(describing: content))")
print("Error-Correction-Level: \(desc.errorCorrectionLevel)")
print("Symbol-Version: \(desc.symbolVersion)")
}
}
}
})
|
参考
用苹果官方 API 实现 iOS 备忘录的扫描文稿功能
Recognizing Text in Images
关于系统的 Live Text
iOS 15 UITextField长按菜单支持live text 扫描插入文字功能
