com.google.zxing.multi
Class ByQuadrantReader

java.lang.Object
  com.google.zxing.multi.ByQuadrantReader

All Implemented Interfaces:

Reader

public final class ByQuadrantReader
extends Object
implements Reader

This class attempts to decode a barcode from an image, not by scanning the whole image, but by scanning subsets of the image. This is important when there may be multiple barcodes in an image, and detecting a barcode may find parts of multiple barcode and fail to decode (e.g. QR Codes). Instead this scans the four quadrants of the image -- and also the center 'quadrant' to cover the case where a barcode is found in the center.

See Also:

GenericMultipleBarcodeReader

Since:

BlackBerry API 6.0.0

Constructor Summary

ByQuadrantReader(Reader delegate)

Method Summary
Result	decode(BinaryBitmap image) Locates and decodes a barcode in some format within an image.
Result	decode(BinaryBitmap image, Hashtable hints) Locates and decodes a barcode in some format within an image.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ByQuadrantReader

public ByQuadrantReader(Reader delegate)

Since:

BlackBerry API 6.0.0

Method Detail

decode

public Result decode(BinaryBitmap image)
              throws NotFoundException,
                     ChecksumException,
                     FormatException

Description copied from interface: Reader

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

Specified by:

decode in interface Reader

Parameters:

image - image of barcode to decode

Returns:

String which the barcode encodes

Throws:

NotFoundException - if the barcode cannot be located or decoded for any reason

ChecksumException

FormatException

Since:

BlackBerry API 6.0.0

decode

public Result decode(BinaryBitmap image,
                     Hashtable hints)
              throws NotFoundException,
                     ChecksumException,
                     FormatException

Description copied from interface: Reader

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.

Specified by:

decode in interface Reader

Parameters:

image - image of barcode to decode

hints - passed as a Hashtable from DecodeHintType to arbitrary data. The meaning of the data depends upon the hint type. The implementation may or may not do anything with these hints.

Returns:

String which the barcode encodes

Throws:

NotFoundException - if the barcode cannot be located or decoded for any reason

ChecksumException

FormatException

Since:

BlackBerry API 6.0.0