CIDetector沒有檢測到QRCode

我試圖從UIImage中使用CIDetector檢測QRCode以便從中提取messageString。CIDetector沒有檢測到QRCode

我有一個函數，基本上接收UIImage作爲輸入並返回解碼的messageString。

我傳遞給此函數的UIImage是使用PHAsset，PHAssetCollection，PHImageRequestOptions等從用戶庫中提取的。請求是同步製作的，我獲得的所有圖像質量都很好（我試圖呈現圖像在UIImageView只是爲了確保圖像是可讀的）。

在這裏你可以看到代碼的片段請求圖片：

let _: PHImageRequestID = PHImageManager.defaultManager().requestImageForAsset(asset as! PHAsset, targetSize: size, contentMode: PHImageContentMode.AspectFit, options: options, resultHandler: { (image: UIImage?, info:[NSObject : AnyObject]?) -> Void in 
        images.append(image!) 
       })

得到我要檢測的QRCodes圖像後，我用下面的代碼：

func scanImage(image: CIImage) -> String { 

    let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyHigh]) 
    var image = CIImage(image: uiimage) 

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

我發現這個（Core Image Detector(CIDetector) is not detecting QRCodes）和其他類似的問題，但他們似乎都沒有工作。

這是教程中，我跟着https://www.shinobicontrols.com/blog/ios8-day-by-day-day-13-coreimage-detectors

難道我做錯了什麼？

在此先感謝

來源

2016-01-24 mvcs

是你逝去的CIImage在功能

func scanImage(image: CIImage)

，然後你用不確定的圖像中

var image = CIImage(image: uiimage)

再添圖像變量刪除此行的問題，它應該是好的我正在爲自己寫一個QRCode，如果你感興趣，你可以檢查出來。

// open photo library 
func loadGallery() { 
    let imagePicker = UIImagePickerController() 
    imagePicker.delegate = self 
    imagePicker.sourceType = .PhotoLibrary 
    self.presentViewController(imagePicker, 
     animated: true, 
     completion: nil) 
} 

// read QRCode from selecting image 
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { 
    let qrImg:UIImage = info[UIImagePickerControllerOriginalImage] as! UIImage 

    if #available(iOS 8.0, *) { 
     let detector:CIDetector = CIDetector(ofType: CIDetectorTypeQRCode, context:nil, options:[CIDetectorAccuracy: CIDetectorAccuracyHigh]) 
     let ciimg: CIImage = CIImage(image: qrImg)! 
     let features = detector.featuresInImage(ciimg) 

     for feature in features as! [CIQRCodeFeature] { 
      print(feature.messageString) 
     } 


    } else { 
     // Fallback on earlier versions 
    } 

    dismissViewControllerAnimated(true, completion: nil) 
}

更新到夫特3的xcode 8.1

// read QRCode from selecting image 
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { 


    let qrImg:UIImage = info[UIImagePickerControllerOriginalImage] as! UIImage 

    if #available(iOS 8.0, *) { 
     let detector:CIDetector = CIDetector(ofType: CIDetectorTypeQRCode, context:nil, options:[CIDetectorAccuracy: CIDetectorAccuracyHigh])! 
     let ciimg: CIImage = CIImage(image: qrImg)! 
     let features = detector.features(in: ciimg) 

     for feature in features as! [CIQRCodeFeature] { 
      print(feature.messageString!) 
     } 


    } else { 
     // Fallback on earlier versions 
    } 
    dismiss(animated: true, completion: nil) 
}

希望這是是有益

來源

2016-04-04 17:43:40 Arashk

...我已經測試上面的代碼.....特徵對象返回的數組大小0 .....我錯過了什麼？ – Cloy

我檢查了代碼並將其更新到新版本的swift，它在我的項目中工作正常。看看這篇文章，也許這將有助於[http://stackoverflow.com/questions/39009889/xcode-8-creating-an-image-format-with-an-unknown-type-是一個錯誤） – Arashk

我還得到了一個大小爲0的數組。將上面的代碼更改爲'CIDetector.init（...）'而不是'CIDetector（...）'解決了問題，現在CIDetector讀取QRCodes正好。 –

CIDetector沒有檢測到QRCode

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