The right way to reading and distinguish barcodes from picture file needed.

So you need an algorithm for image recognision? Why do you post here instead of comp.graphics.algorithms?

Huh? Explain your problem... What exactly do you have in the "image", then?

What exactly do you have in the "image"?Is it scanned? Photographed? Is it produced by another program? Do you have to take the possible orientations into account?

Then what you need is an image recognision program.