barcode-detector-polyfill-worker

:construction: WIP: BarcodeDetector Polyfill :construction:

Spec compliant polyfill of the Barcode Detection API. It can be used for barcode/QR-code recognition in images from various kinds of sources including <canvas>, <img>, <image> (inside SVGs), <video>, File, Blob, ImageData, ImageBitmap, OffscreenCanvas.

[TODO: live demos]

Design goals:

• spec compliance
• support as many barcode formats as possible
• detect multiple codes in one image
• provide position/coordinate information of detected codes
• sufficient performance to process live video streams

Installation

npm install barcode-detector

import BarcodeDetector from "barcode-detector"

// polyfill unless already supported
if (!("BarcodeDetector" in window)) {
  window.BarcodeDetector = BarcodeDetector
}

Usage

// pick barcode formats. Other formats will be ignored
const barcodeDetector = new BarcodeDetector({ formats: ["qr_code"] })

// directly pass an image element, video element, ...
const barcodes = await barcodeDetector.detect(someImageSource)

// can detect multiple barcodes in one image
const [ barcode1, barcode2, ...evenMoreBarcodes ] = barcodes

// access encoded string
const { rawValue } = barcode1

For in-depth documentation checkout the corresponding MDN page.

Supported Formats

src/BarcodeDetectorJsqr.ts:

• :x: aztec
• :x: code_128
• :x: code_39
• :x: code_93
• :x: codabar
• :x: data_matrix
• :x: ean_13
• :x: ean_8
• :x: itf
• :x: pdf417
• :heavy_check_mark: qr_code
• :x: upc_a
• :x: upc_e

src/BarcodeDetectorZXing.ts (not exposed at the moment. See #1):

• :heavy_check_mark: aztec
• :heavy_check_mark: code_128
• :heavy_check_mark: code_39
• :x: code_93
• :x: codabar
• :heavy_check_mark: data_matrix
• :heavy_check_mark: ean_13
• :heavy_check_mark: ean_8
• :heavy_check_mark: itf
• :heavy_check_mark: pdf417
• :heavy_check_mark: qr_code
• :x: upc_a
• :x: upc_e