Barcode reading using picture taken using mobile phone camera

Question

How do we do programmatic reading of a barcode that is captured using a mobile phone camera? For example, how do that using iPhone or Android or Java ME? Do we need separate har

Answer 1

Just for an update to all the newbies looking for an answer to this question, Google now offers Barcode Detection Apis via Google Play Services to simplify scanning barcode using phone's camera. No more need to depend on Third Party Apis.