如何从UIImage中提取AVMetadataObject？ [英] How can I extract an AVMetadataObject from a UIImage?

问题描述

我想使用iOS 7的新条码扫描功能和 UIImage ，而不是从设备的相机中实时捕捉。我已经通过 AVCaptureDeviceInput 对检测进行了正常工作。

I'd like to use iOS 7's new barcode scanning functionality with a UIImage instead of live capture from one of the device's camera. I already have the detection working fine with an AVCaptureDeviceInput.

我认为这样做的最好方法是创建一个 AVCaptureInput 的具体子类，它从 UIImage UIImage AVCaptureSession 提供媒体数据。但是，我找不到任何关于如何子类 AVCaptureInput 的文档或示例，所以我不知所措。

The best way I think to do this would be to create a concrete subclass of AVCaptureInput that provides media data to an AVCaptureSession from a UIImage. However, I can't find any documentation or examples on how to subclass AVCaptureInput, so I'm at a loss.

另一种方法是从现有的 AVCaptureDeviceInput 覆盖媒体流，但由于这些API是私有的，我想在App Store上发布我的应用，这不太理想。

An alternative would be to override the media stream from an existing AVCaptureDeviceInput, but since those API's are private and I'd like to publish my app on the App Store, this isn't ideal.

最终，我可能最终会使用像ZXing或ZBar这样的第三方条形码库来做这件事，但这似乎是浪费能够在这里使用Apple的内置功能。<​​/ p>

Ultimately, I'll likely end up doing this using a 3rd party barcode library like ZXing or ZBar, but it seems like a waste to not be able to use Apple's built-in functionality here.

推荐答案

生活很简单。
您可以使用CIDetector。
将图像转换为CIImage，由CIDetector解码。

life is easy. You can use CIDetector instead. Convert an image into CIImage to be decoded by CIDetector.

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