Recognizing LCD/LED number digits

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Created Jun ’20

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I want to make a feature in my App, where a user can use the Camera to capture the data of an LCD screen, for example a thermostat or a digital clock.

I downloaded the sample Text recognition project and tweaked it to only search for numbers. But whenever I show it a photo of a digital number (LCD/LED) it just cannot recognize it.

So I searched for an answer, and I came to the conclusion that I have to train a model with these kind of numbers.

My question is, how should I do it, what kind of photos should I take for training?

Thank you for the help in advance!
Have a nice WWDC

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Answer 1

Frameworks Engineer OP

Apple

Jun ’20

Accepted Answer

Segmented numbers like the ones you find in LCD or LED displays are not supported by the VNRecognizeTextRequest. So your idea of training your own detector is the right way to go. There are 2 sessions that talk about how to do that:
https://developer.apple.com/videos/play/wwdc2019/228/
https://developer.apple.com/videos/play/wwdc2017/506

I hope this helps

3

Answer 2

RobinKlippa OP

Dec ’22

Segmented numbers like the ones you find in LCD or LED displays are not supported by the VNRecognizeTextRequest.

Can you confirm this is still true?

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