Class Binarizer

Namespace

ZXing

Assembly

zxing.dll

This class hierarchy provides a set of methods to convert luminance data to 1 bit data. It allows the algorithm to vary polymorphically, for example allowing a very expensive thresholding technique for servers and a fast one for mobile. It also permits the implementation to vary, e.g. a JNI version for Android and a Java fallback version for other platforms.

       <author>dswitkin@google.com (Daniel Switkin)</author>

public abstract class Binarizer

Inheritance

object

Binarizer

Derived

GlobalHistogramBinarizer

Inherited Members

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Constructors

Binarizer(LuminanceSource)

Initializes a new instance of the Binarizer class.

protected Binarizer(LuminanceSource source)

Parameters

source LuminanceSource

The source.

Properties

BlackMatrix

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

public abstract BitMatrix BlackMatrix { get; }

Property Value

BitMatrix

The 2D array of bits for the image (true means black).

Height

Gets the height of the luminance source object.

public int Height { get; }

Property Value

int

LuminanceSource

Gets the luminance source object.

public virtual LuminanceSource LuminanceSource { get; }

Property Value

LuminanceSource

Width

Gets the width of the luminance source object.

public int Width { get; }

Property Value

int

Methods

createBinarizer(LuminanceSource)

Creates a new object with the same type as this Binarizer implementation, but with pristine state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache of 1 bit data. See Effective Java for why we can't use Java's clone() method.

public abstract Binarizer createBinarizer(LuminanceSource source)

Parameters

source LuminanceSource

The LuminanceSource this Binarizer will operate on.

Returns

Binarizer

A new concrete Binarizer implementation object.

getBlackRow(int, BitArray)

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. For callers which only examine one row of pixels at a time, the same BitArray should be reused and passed in with each call for performance. However it is legal to keep more than one row at a time if needed.

public abstract BitArray getBlackRow(int y, BitArray row)

Parameters

y int

The row to fetch, which must be in [0, bitmap height)

row BitArray

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

BitArray

The array of bits for this row (true means black).