Jb2Decoder Class

The class derives from ImageDecoder and decodes JBIG2 images. Jb2Decoder may access to an existing JBIG2 file or JBIG2 embedded stream (StreamForPdf, refer to Jb2ExportFileFormat).

Inheritance Hierarchy

SystemObject
  Atalasoft.Imaging.CodecImageDecoder
    Atalasoft.Imaging.CodecMultiFramedImageDecoder
      Atalasoft.Imaging.Codec.Jbig2Jb2Decoder

Namespace: Atalasoft.Imaging.Codec.Jbig2
Assembly: Atalasoft.dotImage.Jbig2 (in Atalasoft.dotImage.Jbig2.dll) Version: 11.4.0.9.0.377 (.NET 4.5.2, x86)

Syntax

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public class Jb2Decoder : MultiFramedImageDecoder, IDisposable

Public Class Jb2Decoder
	Inherits MultiFramedImageDecoder
	Implements IDisposable

The Jb2Decoder type exposes the following members.

Constructors

	Name	Description
	Jb2Decoder	Creates a gcnew instance of a Jb2Decoder.

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Properties

	Name	Description
	ScaleDownFactor
	SpaceUpFactor
	SupportedImageType	Obsolete. Returns the ImageType that the implemented decoder class supports. (Inherited from ImageDecoder.)

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Methods

	Name	Description
	Dispose	Releases all resources used by the Jb2Decoder
	Dispose(Boolean)	Releases the unmanaged resources used by the Jb2Decoder and optionally releases the managed resources
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetFrameCount	Returns the number of frames in the image (Overrides MultiFramedImageDecoderGetFrameCount(Stream).)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetImageInfo(Stream)	Returns information about a JBIG2 image such as width, height, and resolution. (Overrides ImageDecoderGetImageInfo(Stream).)
	GetImageInfo(Stream, Int32)	Returns information about a JBIG2 image such as width, height, and resolution. (Overrides MultiFramedImageDecoderGetImageInfo(Stream, Int32).)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsValidFormat	Returns true if the specified Stream is a JBIG2 image. (Overrides ImageDecoderIsValidFormat(Stream).)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	Read(Stream, ProgressEventHandler)	Decodes a JBIG2 image from a stream and returns an AtalaImage with the decoded image data. (Overrides ImageDecoderRead(Stream, ProgressEventHandler).)
	Read(Stream, Int32, ProgressEventHandler)	Decodes a JBIG2 image from a stream and returns an AtalaImage with the decoded image data. (Overrides MultiFramedImageDecoderRead(Stream, Int32, ProgressEventHandler).)
	ReadRegion	Decodes a specified region of a JBIG2 image given a source Stream.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

To add the ability to decode JBIG2 images, simply add an instance of the Jb2Decoder to the DecoderDictionary collection in the RegisteredDecoders class. See the below example.

Examples

Jb2 decoder C# (C#)

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using Atalasoft.Imaging.Codec.Jpeg2000;  
...  
Jp2Decoder jp2 = new Jp2Decoder();  
RegisteredDecoders.Decoders.Add(jp2);

Jb2 Decoder VB (Visual Basic)

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Imports Atalasoft.Imaging.Codec.Jpeg2000
...
Dim jp2 As Jp2Decoder = New Jp2Decoder()
RegisteredDecoders.Decoders.Add(jp2)

Jb2 Decoder C++ (CPP)

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using namespace Atalasoft::Imaging::Codec;
...
Jb2Decoder jb2 = new Jb2Decoder();  
RegisteredDecoders::Decoders::Add(jb2);

Reference

Atalasoft.Imaging.Codec.Jbig2 Namespace