Microblink：读取图像

Question

我要求 Microblink 读卡器查看卡片的照片，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)
}()

我的班级已经声明了这两个代表：

MBCBlinkCardOverlayViewControllerDelegate, MBCScanningRecognizerRunnerDelegate

我确定我正在向这个函数传递一个正确的 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)
    }
}

你能明白为什么不是吗？我看到日志警告You are using time-limited license key! 有关系吗？

Answer 1

从提供的代码中，我可以看到 recognizerRunner 和 prepareToReadImage 方法已正确输入。 但是，在您定义识别器和recognizerCollection 的第一个代码块中，我可以看到问题可能出在MBCRecognizerCollection 上，因为它的参数recognizers 的类型为[MBCRecognizer]，你把[MBCBlinkCardRecognizer]放在那里。我可以建议这个解决方案，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定义了 BlinkCardRecognizer 和 RecognizerRunner，所以应该没有任何区别：

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

这里补充一下，看到You are using time-limited license key!没关系，只是说明你使用的是限时键，应该不会影响扫描过程。