Could anybody tell me about the general steps to decode QR code in zxing?

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I want to read zxing source code, but before doing that i hope someone can tell me the general steps to decode QR code in zxing.
Thanks in advance.

Posted 1-Apr-12 20:57pm

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YvesDaoust · Accepted Answer · 2012-04-22T22:43:00

Solution 1

I can't tell you specifics about the zxing code, but the general procedure to read a QR is:

- locate the finder and alignment patterns (nested black/white squares);

- determine the cell size, possibly from the "timing patterns" (dotted rows);

- now you can predict the coordinates of any cell;

- binarize the cells and reorder them in the reading order to form a bit stream;

- apply the error detection/correction algorithm to the bit stream;

- decode the corrected stream to characters depending on the encodation format.

Posted 22-Apr-12 22:43pm

YvesDaoust

Comments

StarStarStarStarStar 23-Apr-12 8:34am

thanks your reply!

StarStarStarStarStar 16-May-12 10:19am

Hi YvesDaoust! I think you said "cell" in case is light/dark module ? i'm not sure i think right, so could you explain for me?

YvesDaoust 16-May-12 11:08am

Yes, quite right. For me the module is more the size of the cells, but this is just a matter of convention.