QRCodeScanner

QRCodeScanner is a software component and user-facing application designed to detect and decode QR codes from camera input or image files. It can be a standalone app or integrated as a library in other software to provide barcode scanning functionality. While optimized for QR codes, many implementations also support additional 1D and 2D barcodes depending on the decoding engine.

Background and purpose: QR codes are two‑dimensional barcodes that encode data such as URLs, text, or contact information. QRCodeScanner aims to deliver fast, reliable recognition across devices, enabling use cases in mobile wallets, tickets, marketing, and inventory management.

Features: real‑time scanning with autofocus and exposure control; adjustable scanning area; multi‑region decoding; robust handling of damaged codes; offline operation; support for multiple color spaces; batch processing of images; privacy controls.

Architecture: common components include a camera interface, image capture and preprocessing, a decoding engine (often based on ZXing or similar), result handling, and UI integration. Some implementations leverage WebAssembly or native code for performance.

Platform and licensing: deployments exist on mobile (iOS and Android) and web platforms, as a library or a standalone app. Licenses vary by project and may include permissive options such as MIT or Apache 2.0, or copyleft licenses in open-source variants.

See also: QR code, Barcode scanning, ZXing, ZBar.