CODEWITHSUNDEEP
androidzxing
Josh Wilson
Josh Wilson

Reputation: 3745

Reading a 1D barcode regardless of Orientation

I am trying to use ZXing to read 1D barcodes and want to be able to read the barcode no matter the orientation since I am assuming the person may not be looking at the image. I noticed that ZXing can read the barcode up to 45 degrees. Is there a reason it doesn't test both orientations of the image, and is it possible to make it do this?

If not are there alternatives that can?

Upvotes: 1

Views: 1392

Answers (1)

Sean Owen
Sean Owen

Reputation: 66886

The reason is just that 99.9% of the time people scan a barcode in its natural orientation (or upside down). Scanning for vertical barcodes would usually just be a waste of time, when you could be getting on to another frame to scan. But it's easy to do, just add an extra chunk of code to rotate and re-scan the image.

@user117 it is not necessary to try all orientations. Any rotation for which a horizontal line still passes through the whole barcode works. You would only have to try additional rotations to cover cases beyond those, and it turns out that 4 would be the most that are needed to cover any orientation.

Upvotes: 1

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