search

zxing-js / library

Multi-format 1D/2D barcode image processing library, usable in JavaScript ecosystem.
https://zxing-js.github.io/library/
Apache License 2.0
2.36k stars 535 forks source link

Unable to scan image with large black backgrounds #593

Open ioripalm opened 3 months ago

ioripalm commented 3 months ago

I replaced the image src in the example(barcode-image/index.html) to test whether the barcode can be scanned from the my high-definition camera. 微信图片_20240330112045 The resolution of the photo by my high-definition camera is 3264*2448.

1

In Picture 1, you can see that the barcode area only occupies a small area in the middle of the photo.This depends on the size of the shooting paper. Sometimes it is A4, sometimes it is A5, and sometimes it is just a small tip.After testing, it always fails. If I crop out the black background of the original photo, it's work well.

2

Next I tried replacing the black background with white. Miraculously, it worked. For pictures with a black background, is the black background recognized as part of the barcode?

3

I try to use this to crop the image and then scan the barcode is worked. Is there a way to directly identify the barcode?

ioripalm commented 3 months ago

I found a nice example base : ZXing WASM The only drawback is that it is not very accurate in recognizing barcodes in non-horizontal conditions, which quaggaJS does very well.