Struct rxing::oned::ITFReader

pub struct ITFReader { /* private fields */ }

Implements decoding of the ITF format, or Interleaved Two of Five.

This Reader will scan ITF barcodes of certain lengths only. At the moment it reads length 6, 8, 10, 12, 14, 16, 18, 20, 24, and 44 as these have appeared "in the wild". Not all lengths are scanned, especially shorter ones, to avoid false positives. This in turn is due to a lack of required checksum function.

The checksum is optional and is not applied by this Reader. The consumer of the decoded value will have to apply a checksum if required.

http://en.wikipedia.org/wiki/Interleaved_2_of_5 is a great reference for Interleaved 2 of 5 information.

@author kevin.osullivan@sita.aero, SITA Lab.

Trait Implementations

impl Default for ITFReader

fn default() -> Self

Returns the “default value” for a type.

impl OneDReader for ITFReader

fn decode_row( &mut self, rowNumber: u32, row: &BitArray, hints: &DecodingHintDictionary ) -> Result<RXingResult>

Attempts to decode a one-dimensional barcode format given a single row of

fn _do_decode<B: Binarizer>( &mut self, image: &mut BinaryBitmap<B>, hints: &DecodingHintDictionary ) -> Result<RXingResult>

We’re going to examine rows from the middle outward, searching alternately above and below the middle, and farther out each time. rowStep is the number of rows between each successive attempt above and below the middle. So we’d scan row middle, then middle - rowStep, then middle + rowStep, then middle - (2 * rowStep), etc. rowStep is bigger as the image is taller, but is always at least 1. We’ve somewhat arbitrarily decided that moving up and down by about 1/16 of the image is pretty good; we try more of the image if “trying harder”.

impl Reader for ITFReader

fn decode<B: Binarizer>( &mut self, image: &mut BinaryBitmap<B> ) -> Result<RXingResult, Exceptions>

Locates and decodes a barcode in some format within an image.

fn decode_with_hints<B: Binarizer>( &mut self, image: &mut BinaryBitmap<B>, hints: &DecodingHintDictionary ) -> Result<RXingResult, Exceptions>

Locates and decodes a barcode in some format within an image. This method also accepts hints, each possibly associated to some data, which may help the implementation decode.

fn reset(&mut self)

Resets any internal state the implementation has after a decode, to prepare it for reuse.