Microblink:读取图像

Question

我要求Microblink care阅读器看一张卡片的照片，而不是使用相机：

lazy var blinkCardRecognizer: MBCBlinkCardRecognizer = {
    return MBCBlinkCardRecognizer()
}()
lazy var recognizerCollection: MBCRecognizerCollection = {
    blinkCardRecognizer.extractCvv = false
    blinkCardRecognizer.extractIban = false
    blinkCardRecognizer.extractExpiryDate = false
    
    let recognizerList = [blinkCardRecognizer]
    return MBCRecognizerCollection(recognizers: recognizerList)
}()

我的类声明了这两个委托：

MBCBlinkCardOverlayViewControllerDelegate, MBCScanningRecognizerRunnerDelegate

我确信我给这个函数传递了一个正确的UIImage，并且我确实得到了processImage调用：

func prepareToReadImage(_ theImage: UIImage?) {
    let recognizerRunner: MBCRecognizerRunner = MBCRecognizerRunner(recognizerCollection: recognizerCollection)
    recognizerRunner.scanningRecognizerRunnerDelegate = self
    
    var image: MBCImage? = nil
    if let anImage = theImage {
        image = MBCImage(uiImage: anImage)
    }
    image?.cameraFrame = true
    image?.orientation = MBCProcessingOrientation.left
    let _serialQueue = DispatchQueue(label: "com.microblink.DirectAPI-sample-swift")
    _serialQueue.async(execute: {() -> Void in
        recognizerRunner.processImage(image!)
    })
}

但是这个回调没有被命中：

func recognizerRunner(_ recognizerRunner: MBCRecognizerRunner, didFinishScanningWith state: MBCRecognizerResultState) {
    if state == .valid {
        print (state)
    }
}

你能明白为什么它不是吗？我看到警告You are using time-limited license key!的日志有关系吗？

Answer 1

从所提供的代码中，我可以看到已经正确输入了recognizerRunner和prepareToReadImage方法。但是，在定义识别器和recognizerCollection的第一段代码中，我可以看到问题可能出在MBCRecognizerCollection上，因为它的参数recognizers的类型是[MBCRecognizer]，而您在那里放置了[MBCBlinkCardRecognizer]。我可以推荐这个解决方案，看看它是否有效：

    blinkCardRecognizer = MBCBlinkCardRecognizer()
    var recognizerList = [MBCRecognizer]()
    
    let recognizerCollection: MBCRecognizerCollection = {
        blinkCardRecognizer.extractCvv = false
        blinkCardRecognizer.extractIban = false
        blinkCardRecognizer.extractExpiryDate = false
        
        recognizerList.append(blinkCardRecognizer!)
        return MBCRecognizerCollection(recognizers: recognizerList)
    }()

    recognizerRunner = MBCRecognizerRunner(recognizerCollection: recognizerCollection)

唯一的区别是，我之前已经定义了BlinkCardRecognizer和RecognizerRunner，所以这不会有任何不同：

private var recognizerRunner: MBCRecognizerRunner?
private var blinkCardRecognizer: MBCBlinkCardRecognizer?

在这里补充一下，如果您看到You are using time-limited license key!，这并不重要，它只是一个指示器，表明您正在使用有时间限制的键，它不应该影响扫描过程。