核心图像检测器（CIDetector）未检测到QRCode [英] Core Image Detector(CIDetector) is not detecting QRCodes

问题描述

我正在尝试让我的应用程序用户能够从其库中获取图像并从中扫描QRCode。以下是相关代码：

I am trying to give the user of my app the ability to take an image from their library and scan the QRCode from it. Here is the relevant code:

这是从图像选择器返回的带有所选图像的函数。

This is the function that returns from the Image Picker with the selected image.

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
    let thisImage:CIImage? = CIImage(image: image)
    let code = performQRCodeDetection(thisImage!)

    self.dismissViewControllerAnimated(true, completion: nil)

    self.performSegueWithIdentifier("goBackSegue", sender: code)


}

内部该函数我调用此函数进行QRCode扫描：

Inside that function I call this function to do the QRCode scanning:

func performQRCodeDetection(image: CIImage) -> String {
    var decode = ""
    let options = [CIDetectorAccuracy: CIDetectorAccuracyHigh]
    let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: options)

    let features = detector.featuresInImage(image)
    for feature in features as! [CIQRCodeFeature] {
        decode = feature.messageString
    }
    return decode
}

变量功能始终返回为空。该图像中肯定有QRCode。我从各个方向和大小拍摄了图像。我没有任何结果。

The variable features always comes back empty. The image definitely has a QRCode in it. I took the image from all orientations and sizes. I cannot get any results.

有什么想法吗？

谢谢！

推荐答案

问题出在相册的照片质量上。
如果您将捆绑包中的qr图像文件替换为 image，例如[UIImage imageNamed：@ foobar.png]，则会显示qr结果。
顺便说一句，我尝试了可能的照片，但没有运气使它起作用。

the issue is on photo quality in the photo album. if you put a qr image file from bundle replacing "image" e.g.. [UIImage imageNamed:@"foobar.png"], the qr result will appear. By the way, I tried may photos, no luck to get it works.

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