This example demonstrates how to do bar code recognition.
It supports Code128, Code39, EAN13, EAN8, UPC-A, UPC-E, Codabar, Interleaved 2 of 5, Code 93, UCC_128, QR code, Data Matrix, Aztec, PDF 417, MaxiCode, RSS-14 and RSS-Expanded.
There are three ways to specify the source image for barcode recognition:
1. specify a picture file path;
2. Encode image file content in Base64 mode;
3. specify the camera, take photos from the camera and then identify.