Gets the confidence of the recognized barcode.

Barcodes are assumed to have a 100 percent confidence from which points are deducted. Confidence reporting is based on several factors: 1. Barcodes that require the use of check digits that have not produced the anticipated checksum value will cause a reduced confidence. Invalid checksums will have a reduction of at least 50. 2. Barcodes that are recognized but that also include errors will cause a reduction in confidence. These could be barcodes that were recovered because of the checksum. The confidence of these barcodes is reduced by as much as 30.

public int getConfidence()