Barcode scanner detected wrong barcode sometimes

[longld103]

These are results of detector. String 1209-002558GK28E21060524860000321 is correct

1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-, 9ZGK18E210523242150321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
3410702717477
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-, 9ZGK18E210523242150321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321

[google-oss-bot]

This issue does not seem to follow the issue template. Make sure you provide all the required information.

[longld103]

@zhouyiself Could you help me check

[samtstern]

@longld103 it looks like you have the correct result the majority of the time, can you explain what the issue is?

Please use the issue template when filing issue.s

[longld103]

Step 1: Describe your environment

• Android device: Samsung galaxy note10 (N975F)
• Android OS version: Android 10
• Google Play Services version: com.google.gms:google-services:4.3.3
• Firebase/Play Services SDK version: com.google.firebase:firebase-ml-vision:24.0.3

Step 2: Describe the problem:

I'm using camera2 api, get bitmap from onImageAvaiable function > put the bitmap to firebase barcode detector

Steps to reproduce:

1. live stream camera view and focus to the barcode

Observed Results:

• These are results of detector. String 1209-002558GK28E21060524860000321 is correct

1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-, 9ZGK18E210523242150321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
3410702717477
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-, 9ZGK18E210523242150321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321

Expected Results:

• always return 1209-002558GK28E21060524860000321 string value

Relevant Code:

This is my code:
firebaseDetector = FirebaseVision.getInstance().getVisionBarcodeDetector();
and
firebaseDetector.detectInImage(image)

[samtstern]

@longld103 the correct response is returned 12/15 frames. Unfortunately there's no way to guarantee you get the correct response on every single frame, especially when the source image is imperfect (like yours).

I would suggest waiting until you get the same response in two frames, that way you know it's right.

[longld103]

Hi @samtstern
When I tested with high quality image, the issue still occur but wrong rate down to <1%.
FirebaseBarcodeScanner is great however it not have trust 100%
So the point of the issue is input image not good or FirebaseBarcodeScanner can't decode correct 100%?

these are results:

1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
1118188288888
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321
9122181222222
1209-002558GK28E21060524860000321
1209-002558GK28E21060524860000321

[samtstern]

@longld103 thank you for trying again with a higher-quality image, that's really helpful.

Unfortunately we can't count on 100% accuracy for MLKit because there are too many factors:

• Phone cameras
• Lenses and focus distance
• Variable "correct" bar code widths

I would suggest the following ways to make your application more resilient:

• Wait until you get two results that are the same, it is highly likely that's correct.
• If you know the size of the barcode you're expecting, wait until you get a result of the right length.

[longld103]

@samtstern Thank for your reply. MLKit is wonderful 😘