How to determine the QR code is positive and there is no rotation

Buding

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Apr 20, 2018, 2:37:52 AM4/20/18

to zxing

Lachezar Dobrev

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Apr 20, 2018, 8:47:10 AM4/20/18

to Buding, zxing

AFAIK there is no out-of-the-box solution.
You *might* use the result meta-data and check the relative location
of the three result-point corners.
Also the colour at (or around) the three result-points should tell
you if the code was positive or negative.

Haven't tested that, but it seems the DecoderResult.getOther() will
return a QRCodeDecoderMetaData when the QR Code was mirrored.

2018-04-20 9:37 GMT+03:00 Buding <10633...@qq.com>:
> How to determine the QR code is positive and there is no rotation
>

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M M

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May 17, 2020, 9:29:20 AM5/17/20

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Hi Lachezar,

how can i get access to the result meta-data and see check the relative location
of the three result-point corners?

I am writing my solution in C#

Thanks a lot.

Diego Mitchell.

El viernes, 20 de abril de 2018, 9:47:10 (UTC-3), Lachezar Dobrev escribió:

AFAIK there is no out-of-the-box solution.
You *might* use the result meta-data and check the relative location
of the three result-point corners.
Also the colour at (or around) the three result-points should tell
you if the code was positive or negative.

Haven't tested that, but it seems the DecoderResult.getOther() will
return a QRCodeDecoderMetaData when the QR Code was mirrored.

2018-04-20 9:37 GMT+03:00 Buding <10633...@qq.com>:
> How to determine the QR code is positive and there is no rotation
>
> --
> You received this message because you are subscribed to the Google Groups "zxing" group.

> To unsubscribe from this group and stop receiving emails from it, send an email to zx...@googlegroups.com.

Lachezar Dobrev

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May 18, 2020, 6:35:16 AM5/18/20

to M M, zxing

I am not proficient with C#.
I'll assume you're using the ZXing.Net port.

From the source code it looks like the Result[1] from the decoding
process has an array with the key points[2]. It also looks like there
is meta-data[3] too.

1: https://github.com/micjahn/ZXing.Net/blob/master/Source/lib/Result.cs
2: public ResultPoint[] ResultPoints { get; private set; }
3: public IDictionary<ResultMetadataType, object> ResultMetadata {
get; private set; }

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