com.google.zxing.multi

类 ByQuadrantReader

java.lang.Object

com.google.zxing.multi.ByQuadrantReader

所有已实现的接口:

Reader

public final class ByQuadrantReader
extends java.lang.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.

另请参阅:

GenericMultipleBarcodeReader

构造器概要

构造器

构造器和说明
ByQuadrantReader(Reader delegate)

方法概要

限定符和类型	方法和说明
Result	decode(BinaryBitmap image) Locates and decodes a barcode in some format within an image.
Result	decode(BinaryBitmap image, java.util.Map<DecodeHintType,?> hints) Locates and decodes a barcode in some format within an image.
void	reset() Resets any internal state the implementation has after a decode, to prepare it for reuse.

从类继承的方法 java.lang.Object

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

构造器详细资料

ByQuadrantReader

public ByQuadrantReader(Reader delegate)

方法详细资料

decode

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

从接口复制的说明: Reader

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

指定者:

decode 在接口中 Reader

参数:

image - image of barcode to decode

返回:

String which the barcode encodes

抛出:

NotFoundException - if no potential barcode is found

ChecksumException - if a potential barcode is found but does not pass its checksum

FormatException - if a potential barcode is found but format is invalid

decode

public Result decode(BinaryBitmap image,
                     java.util.Map<DecodeHintType,?> hints)
              throws NotFoundException,
                     ChecksumException,
                     FormatException

从接口复制的说明: 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.

指定者:

decode 在接口中 Reader

参数:

image - image of barcode to decode

hints - passed as a Map 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.

返回:

String which the barcode encodes

抛出:

NotFoundException - if no potential barcode is found

ChecksumException - if a potential barcode is found but does not pass its checksum

FormatException - if a potential barcode is found but format is invalid

reset

public void reset()

从接口复制的说明: Reader

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

指定者:

reset 在接口中 Reader