Package com.google.zxing

Class BinaryBitmap

java.lang.Object com.google.zxing.BinaryBitmap

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public final class BinaryBitmapextends Object

This class is the core bitmap class used by ZXing to represent 1 bit data. Reader objects accept a BinaryBitmap and attempt to decode it. Author:[email protected] (Daniel Switkin)

Constructor Summary

Constructors

Constructor

Description

BinaryBitmap(Binarizer binarizer)

Method Summary

All MethodsInstance MethodsConcrete Methods

Modifier and Type

Method

Description

BinaryBitmap

crop(int left, int top, int width, int height)

Returns a new object with cropped image data.

BitMatrix

getBlackMatrix()

Converts a 2D array of luminance data to 1 bit.

BitArray

getBlackRow(int y, BitArray row)

Converts one row of luminance data to 1 bit data.

int

getHeight()

int

getWidth()

boolean

isCropSupported()

boolean

isRotateSupported()

BinaryBitmap

rotateCounterClockwise()

Returns a new object with rotated image data by 90 degrees counterclockwise.

BinaryBitmap

rotateCounterClockwise45()

Returns a new object with rotated image data by 45 degrees counterclockwise.

String

toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

BinaryBitmap

public BinaryBitmap(Binarizer binarizer)

Method Details

getWidth

public int getWidth() Returns:The width of the bitmap.

getHeight

public int getHeight() Returns:The height of the bitmap.

getBlackRow

public BitArray getBlackRow(int y, BitArray row) throws NotFoundException

Converts one row of luminance data to 1 bit data. May actually do the conversion, or return cached data. Callers should assume this method is expensive and call it as seldom as possible. This method is intended for decoding 1D barcodes and may choose to apply sharpening. Parameters:y - The row to fetch, which must be in [0, bitmap height)row - An optional preallocated array. If null or too small, it will be ignored. If used, the Binarizer will call BitArray.clear(). Always use the returned object.Returns:The array of bits for this row (true means black).Throws:NotFoundException - if row can't be binarized

getBlackMatrix

public BitMatrix getBlackMatrix() throws NotFoundException

Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or may not apply sharpening. Therefore, a row from this matrix may not be identical to one fetched using getBlackRow(), so don't mix and match between them. Returns:The 2D array of bits for the image (true means black).Throws:NotFoundException - if image can't be binarized to make a matrix

isCropSupported

public boolean isCropSupported() Returns:Whether this bitmap can be cropped.

crop

public BinaryBitmap crop(int left, int top, int width, int height)

Returns a new object with cropped image data. Implementations may keep a reference to the original data rather than a copy. Only callable if isCropSupported() is true. Parameters:left - The left coordinate, which must be in [0,getWidth())top - The top coordinate, which must be in [0,getHeight())width - The width of the rectangle to crop.height - The height of the rectangle to crop.Returns:A cropped version of this object.

isRotateSupported

public boolean isRotateSupported() Returns:Whether this bitmap supports counter-clockwise rotation.

rotateCounterClockwise

public BinaryBitmap rotateCounterClockwise()

Returns a new object with rotated image data by 90 degrees counterclockwise. Only callable if isRotateSupported() is true. Returns:A rotated version of this object.

rotateCounterClockwise45

public BinaryBitmap rotateCounterClockwise45()

Returns a new object with rotated image data by 45 degrees counterclockwise. Only callable if isRotateSupported() is true. Returns:A rotated version of this object.

toString

public String toString() Overrides:toString in class Object