Auto focus and auto capture feature for bar code and QR code scanning app on windows tablet 8.1

Question

Hi,

We are making an bar code and QR code scanner app for windows surface tablets 8.1. We have used ZXing library and implemented by keeping "Scan Code" button on UI.

But we want auto focus and auto capture feature. Also, before implementing auto focus, we must implement image recognition of bar code and QR code automatically. 

Is such feature available in .net framework for winRT apps on tablets?

Answer 1

Hi,

We are making an bar code and QR code scanner app for windows surface tablets 8.1. We have used ZXing library and implemented by keeping "Scan Code" button on UI.

But we want auto focus and auto capture feature. Also, before implementing auto focus, we must implement image recognition of bar code and QR code automatically.

Is such feature available in .net framework for winRT apps on tablets?

Answer 2

I think this thread should be in the windows store apps forum.

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Hope that helps
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Answer 3

Assuming the device supports it, autofocus and capture control can be done with the MediaCapture API see Capturing or rendering audio, video, and images

To filter the image recognition you'll need to write a Media Foundation Transform (MFT) calling your ZXing code.

See the Media extensions sample for examples of writing and using MFTs.

--Rob

Answer 4

Hi Rob,

Thanks for your timely reply. We will start recording video using media capture element once application launches. So Our requirement is, to process every captured  video frame to scan QR code and bar code automatically.

Is it possible to do this by using MFT which is suggested by you? Also it will be appreciable if you can give code sample which tells us about integrating MFT with Zxing code.

Answer 5

Yes, a media extension MFT can filter each frame. See the example I linked. You'll have to initiate zxing yourself. I'm not familiar with that library and don't have code which uses it .