QR Code Reader 作者： Joue

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A powerful QR and bar code scanner that supports EAN-13/UPC-A, UPC-E, EAN-8, Code 128, Code 39, Codabar, Interleaved 2 of 5, and QR Code symbologies (types of bar codes). The extension supports scanning from the camera and use local images and keeps the history of the last 20 scanned items. This extension does not rely on any external services to perform detection. There is no server-side interaction whatsoever. Also, note that you can drop local image files to the user interface of the extension to detect the code.

Features:
1. Read multiple QR codes on one image.
2. Supports multiple protocols
3. Saves the history of scanned items

This extension uses ZBar c-library, which is capable of detecting multiple QR codes and bar codes in a single frame.

What is a QR code?
A QR code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached A QR code uses four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to store data efficiently.

What is a barcode?
A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths and spacings of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode readers, of which there are several types. Later, two-dimensional (2D) variants were developed, using rectangles, dots, hexagons, and other geometric patterns, called matrix codes or 2D barcodes, although they do not use bars as such.