QR code (2D barcode) coding and decoding algorithms?

Posted by Adam Davis on Stack Overflow See other posts from Stack Overflow or by Adam Davis
Published on 2008-10-23T22:12:43Z Indexed on 2010/04/05 8:33 UTC
Read the original article Hit count: 461

Filed under:

barcode

|

encode

|

decode

|

camera

|

qr-code

Looking for free/opensource code or description of algorithms to code (simple) and decode (hard) the 2D barcode QR code.

It doesn't seem like a trivial problem, but it's so popular in Japan that there must be something already available...

© Stack Overflow or respective owner

Related posts about barcode

Implements EAN13 and UPC-A barcode in PDF using fpdf in classic ASP

as seen on Stack Overflow - Search for 'Stack Overflow'
/* FPDF library for ASP can be downloaded from: http://www.aspxnet.it/public/default.asp INFORMATIONS: Translated by: Jeremy Author: Olivier License: Freeware DESCRIPTION: This script implements EAN13 and UPC-A barcodes (the second being a particular case of the first one). Bars are drawn… >>> More
Barcode scanner timing to excel

as seen on Super User - Search for 'Super User'
I have a barcode reader that will load the barcode to a excel spreadsheet - great - but now i need it to do 2 things: 1 - add a time stamp to next to the barcode that has been scanned. So Barcode goes to A1, need B2 to show time. 2- find the name (that is in a seperate excel sheet) that is linked… >>> More
BlackBerry barcode scanning library?

as seen on Stack Overflow - Search for 'Stack Overflow'
Anyone got a good handle on a barcode scanning library that can be used to read in UPC-A, EAN-13 or other major barcode formats based on input from the digital camera? Does RIM have a standard library already available for this? I know that BlackBerry Messenger has 2D barcode scanning built-in so… >>> More
is there fee barcode 128 class for delphi (pdf)

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there a free alphanumeric barcode font or class that is compatible with Delphi "PowerPDF" component ? code must be code128. >>> More
is there fee barcode class for delphi (pdf)

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there a free alphanumeric barcode font or class that is compatible with Delphi "PowerPDF" component ? >>> More

Related posts about encode

URI encode and HTML encode

as seen on Stack Overflow - Search for 'Stack Overflow'
If I have the xml/html data to post we need to encode the data to avoid the XSS validation. So should we use HTMLencode or URI encoding for this. If URI encoding is used will it cause issues as form POST automatically URI encode all the data before sending. >>> More
Unable to encode to iso-8859-1 encoding for some chars using Perl Encode module

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a HTML string in ISO-8859-1 encoding. I need to pass this string to HTML:Entities::decode_entities() for converting some of the HTML ASCII codes to respective chars. To so i am using a module HTML::Parser::Entities 3.65 but after decode_entities() operation my whole string changes to utf-8… >>> More
line break within Html.Encode & String.Join

as seen on Stack Overflow - Search for 'Stack Overflow'
I have the following line of code. <%= Html.Encode(string.Join(", ", item.company1.companies.Select(x => x.company_name).ToArray())) %> Would it be possible to somehow replace the comma with a line break? >>> More
OS X: Base64 encode via command line

as seen on Super User - Search for 'Super User'
Is there a terminal command in Mac OS X which will base64 encode a file or stdin? >>> More
Java Speech Example: Encode, Stream, Decode, Play

as seen on Stack Overflow - Search for 'Stack Overflow'
I have been trying to find an example of this that I could use for a couple years, I'm ashamed to admit. I would like to see a working, compileable example (most that I find online don't compile or don't actually work) of reading from the microphone, encoding the voice data in a speech-friendly encoding… >>> More