[Bug report] EAN13 code starting with 0 detected as UPC-A

[sertal70]

EAN13 codes starting with 0 are detected as UPC-A code, dropping the leading 0 in the returned code.

To Reproduce
Example Steps to reproduce the behavior in sample app:

1. launch the example app (I used the iOS version but it doesn't matter)
2. Select "Barcode Scanning"
3. Take a photo of this EAN13 code:

6. Tap on "Detect"
7. See result code: it is missing the initial 0 digit

I have modified the source to print out also the format of the detected code.

Here is the result using an EAN13 starting with 0:

As you can see the detected format is 512, which is UPC-A.

Here is the result using an EAN13 not starting with 0:

The detected format is 32, which is EAN13.

Expected behavior
EAN13 codes should be detected as they are, even when the code starts with 0.

SDK Info:
I'm not sure how to get this info, I simply run pod install and this is the result:

$ pod install
Analyzing dependencies
Downloading dependencies
Installing GTMSessionFetcher (3.3.1)
Installing GoogleDataTransport (9.4.1)
Installing GoogleMLKit (5.0.0)
Installing GoogleToolboxForMac (2.3.2)
Installing GoogleUtilities (7.13.0)
Installing GoogleUtilitiesComponents (1.1.0)
Installing MLImage (1.0.0-beta5)
Installing MLKitBarcodeScanning (4.0.0)
Installing MLKitCommon (10.0.0)
Installing MLKitFaceDetection (4.0.0)
Installing MLKitImageLabeling (4.0.0)
Installing MLKitImageLabelingCommon (6.0.0)
Installing MLKitImageLabelingCustom (4.0.0)
Installing MLKitObjectDetection (4.0.0)
Installing MLKitObjectDetectionCommon (6.0.0)
Installing MLKitObjectDetectionCustom (4.0.0)
Installing MLKitPoseDetection (1.0.0-beta12)
Installing MLKitPoseDetectionAccurate (1.0.0-beta12)
Installing MLKitPoseDetectionCommon (1.0.0-beta12)
Installing MLKitSegmentationCommon (1.0.0-beta10)
Installing MLKitSegmentationSelfie (1.0.0-beta10)
Installing MLKitTextRecognition (3.0.0)
Installing MLKitTextRecognitionChinese (2.0.0)
Installing MLKitTextRecognitionCommon (2.0.0)
Installing MLKitTextRecognitionDevanagari (2.0.0)
Installing MLKitTextRecognitionJapanese (2.0.0)
Installing MLKitTextRecognitionKorean (2.0.0)
Installing MLKitVision (6.0.0)
Installing MLKitVisionKit (7.0.0)
Installing MLKitXenoCommon (1.0.0-beta12)
Installing PromisesObjC (2.4.0)
Installing nanopb (2.30910.0)

Smartphone:

• Device: iPhone7 plus

Development Environment:
(For Android issue feel free to skip this section)

• IDE Eversion: Xcode 15.3
• Laptop: MacBook Pro
• Laptop OS/version: macOS 14.4

[JavaLavaMT]

I like this issue, but for now

https://react-native-vision-camera.com/docs/guides/code-scanning#upc-a-vs-ean-13-codes

"You will need to keep this in mind and do the conversion from EAN-13 to UPC-A yourself. This can be done by removing the front 0 digit from the code to get a UPC-A code."

I am sure they would take a PR for a fix

[sertal70]

@JavaLavaMT the issue is actually the opposite: I ask the library to recognize an EAN-13 code but it returns an UPC-A code, which it is not what I asked and it is not what I scanned.