How to read a EAN-13 bar-code from an image in C ?

Question

I would like to read a EAN-13 bar-code from an image in C. I found the OpenCV library that should help me to compute the image as well as an article about an iPhone App that can read Sudoku.

But in an other hand, I found an opensource library to read DataMatrix bar-code.

I would like to join an existing OpenSource project about reading bar-code instead of starting one, since I am sure that some people already worked on this.

Do you have an idea of were to start and what to use to read EAN-13 barcode in C ?

Answer 1

There is already some very broad 1990's patent on reading barcodes from a cell phone camera. I'm sorry I don't recall the details.

It killed a project I was working on, I do know that.

Answer 2

This project looks quite close to what I am looking for : http://sourceforge.net/projects/zbar/

Answer 3

set a scan line through the image, record the pixel value and rebuild the waveform to bar width, so you can decode the barcode .