[英]Scanning barcode from UIImage natively (i.e., not using ZBar)
I've been using the native barcode scanner functionality provided by apple since iOS7 and it is great, but I needed to scan some static images I had so I could automatically catalogue some barcodes. 自iOS7以来,我一直在使用Apple提供的本机条形码扫描器功能,这很棒,但是我需要扫描一些静态图像,以便能够自动对一些条形码进行分类。
I couldn't find a way to do this natively, so I used an open source package called zBar, and for the most part, it works fine. 我找不到本机执行此操作的方法,因此我使用了一个名为zBar的开源软件包,并且在大多数情况下,它都能正常工作。
However, it returns false values often and sometimes flat out fails to find the barcode. 但是,它经常返回错误的值,有时整齐地找不到条形码。 I also built the c++ library from scratch but I got the same results in my OS X build.
我也从头开始构建c ++库,但是在OS X构建中得到了相同的结果。 It also seems to be an abandoned project.
这似乎也是一个废弃的项目。
Apple's native solution finds the barcode on this static image even if I scan the image from my computer monitor! 即使我从计算机显示器扫描图像,Apple的本机解决方案也会在此静态图像上找到条形码! Same thing goes for the images that return false/incorrect values.
返回错误/不正确值的图像也是如此。
So is there anyway to use apple's libraries to scan a UIImage? 那么,有没有可以使用苹果的库来扫描UIImage呢?
Try this 尝试这个
CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];
if (detector) {
NSArray* featuresR = [detector featuresInImage:scannedImg.CIImage];
NSString* decodeR;
for (CIQRCodeFeature* featureR in featuresR) {
NSLog(@"decode %@ ",featureR.messageString);
decodeR = featureR.messageString;
}
}
An option available now is MLKit from Firebase. 现在可用的选项是Firebase的MLKit。
Add Firebase to your project after setting up your project in their console https://firebase.google.com 在控制台中设置项目后,将Firebase添加到项目中https://firebase.google.com
I use cocoapods to manage dependencies, if you do then add this to your Podfile and pod update
: 我使用cocoapods管理依赖项,如果您这样做,则将其添加到Podfile和
pod update
:
pod 'Firebase/Core'
pod 'Firebase/MLVision'
pod 'Firebase/MLVisionBarcodeModel'
Here's a demo view controller implementation in which you pick a barcode image from your photo library to be scanned by ML kit, and the results are printed in a label. 这是一个演示视图控制器的实现,其中您从照片库中选择要由ML kit扫描的条形码图像,并将结果打印在标签中。
// (Don't forget to ask for Photos access by including this in your info.plist)
<key>NSPhotoLibraryUsageDescription</key>
<string>Enable photo library access to select a photo from your library.</string>
import Firebase
class MyDemoViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
lazy var vision = Vision.vision()
@IBOutlet var textLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func selectImage(_ sender: Any) {
if UIImagePickerController.isSourceTypeAvailable(.savedPhotosAlbum){
print("Button capture")
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .savedPhotosAlbum;
imagePicker.allowsEditing = false
self.present(imagePicker, animated: true, completion: nil)
}
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
guard let image = info[UIImagePickerControllerOriginalImage] as? UIImage else {
return
}
dismiss(animated: true, completion: {
self.checkForCodeInImage(image: image)
})
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
dismiss(animated: true, completion:nil)
}
internal func checkForCodeInImage(image: UIImage) {
let detector = vision.barcodeDetector(options: VisionBarcodeDetectorOptions(formats: .all))
let vImage = VisionImage(image: image)
detector.detect(in: vImage) { features, error in
guard error == nil, let barcodes = features, barcodes.isEmpty == false else {
DispatchQueue.main.async {
self.textLabel.text = "No code found in selected image."
}
return
}
var text = ""
for barcode in barcodes {
guard let rawValue = barcode.rawValue else {
continue
}
let corners = barcode.cornerPoints
let displayValue = barcode.displayValue
print("Corners: \(String(describing: corners))")
print("Found: \(String(describing: displayValue))")
text.append(rawValue)
text.append("\n\n")
// let valueType = barcode.valueType
// switch valueType {
// case .wiFi:
// let ssid = barcode.wifi!.ssid
// let password = barcode.wifi!.password
// let encryptionType = barcode.wifi!.type
// case .URL:
// let title = barcode.url!.title
// let url = barcode.url!.url
// default:
// // See API reference for all supported value types
// break
// }
}
DispatchQueue.main.async {
self.textLabel.text = text
}
}
}
}
Here's a link to their documentation: https://firebase.google.com/docs/ml-kit/ios/read-barcodes 以下是其文档的链接: https : //firebase.google.com/docs/ml-kit/ios/read-barcodes
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