Scanned text mirrored

[BoHellgren]

When I try your app on a Samsung Galaxy S4, the scan result is the real text mirrored from right to left.

If I scan the letters TOLEM the resulting visionText is M3JOT

I tried (a bit desperate) reversing the order of the bytes in the fromBytes input, but then the scan result was LOTEW

The camera was in the portrait orientation.

If I knew how to make a mirror image of a Uint8List image, I could live with this. But I don't...

[lewixlabs]

I just tried with my Galasy S8 to scan https://www.google.com and text seems recognized

I have no S4 to try, my suspect is the parameter rotation: ImageRotation.rotation90

Have you tried setting other values? I have a Nexus 6 and with it i have to set rotation0 to make it working.

I think i have to get real rotation detected using MediaQuery.of(context).orientation or OrientationBuilder https://flutter.io/docs/cookbook/design/orientation

[BoHellgren]

That was my first thought, but..

If I scan the same word (it doesn't mean anything, it is just a sequence of letters for testing)

TOLEM

with rotation270 I get

LOTEW

which is what you could expect if you turn TOLEM upside-down and scan it from right to left.

With rotation0 and rotation180 I get no result at all.

So it is not a rotation problem.

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Den mån 4 feb. 2019 kl 12:49 skrev lewix notifications@github.com:

I just tried with my Galasy S8 to scan https://www.google.com and text seems reconignized [image: image] https://user-images.githubusercontent.com/7371215/52206482-afad4480-287a-11e9-800a-31963a533ee5.png

I have no S4 to try, my suspect is the parameter rotation: ImageRotation.rotation90

Have you tried setting other values? I have a Nexus 6 and with it i have to set rotation0 to make it working.

I think i have to get real rotation detected using MediaQuery.of(context).orientation or OrientationBuilder https://flutter.io/docs/cookbook/design/orientation

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[lewixlabs]

Hi @BoHellgren , i suspect it's a flutter firebase_ml_vision bug. If you agree, you can post your issue on github flutter page. I posted a similar issue time ago me too, here https://github.com/flutter/flutter/issues/19000

Let me know

[BoHellgren]

The scanning works if I do a flipHorizontally with the following code, and then use the flipped image in FirebaseVisionImage.fromBytes. Why this is only needed for some phones I cannot explain.

int height = theImage.height; int width = theImage.width; int len = theImage.planes[0].bytes.length;

Uint8List flippedImage = Uint8List(len);
for (int i = 0; i < height; i++) {
  for (int j = 0; j < width; j++) {
    flippedImage[i * width + j] = theImage.planes[0].bytes[i * width + (width - j) - 1];
  }
}

[lewixlabs]

Reversing the order of bytes for some devices only? This suggests me 2 reasons:

• big endian / little endian architecture on device, but I don't think
• camera in some device differently responds on stream byte array

I noticed one of the contributors of flutter_ml_vision plugin has published a demo of image recognition. Here you can find the code. I would like to integrate his code in my project, maybe can you try you too?

[lewixlabs]

@BoHellgren, flutter plugin has been updated in these days. https://pub.dartlang.org/packages/firebase_ml_vision After updaing this plugin, I noticed my code work in my old Nexus 6 too (before it didn't work). Can you make a test?

[BoHellgren]

@lewixlabs firebase_ml_vision: ^0.5.0+1 does not seem to make any difference for me.

[lewixlabs]

https://github.com/flutter/plugins/pull/1225#issuecomment-465371008 Maybe this will help