Isis::JP2Decoder Class Reference

JPEG2000 decoder class. More...

#include <JP2Decoder.h>

Public Member Functions
	JP2Decoder (const QString &jp2file)
	Constructs a JPEG2000 decoder object.
	~JP2Decoder ()
	JP2Decoder destructor.
JP2Error *	kakadu_error () const
void	OpenFile ()
	Open the JPEG2000 file.
int	GetSampleDimension () const
int	GetLineDimension () const
int	GetBandDimension () const
int	GetPixelBytes () const
bool	GetSignedData () const
void	Read (unsigned char **inbuf)
	Read data from JP2 file containing 8-bit data.
void	Read (short int **inbuf)
	Read data from JP2 file containing 16-bit data.

Static Public Member Functions
static bool	IsJP2 (QString filename)

Detailed Description

JPEG2000 decoder class.

This class is used to decode a JPEG2000 image.

Here is an example of how to use JP2Decoder

JP2Decoder *JP2_decoder;
JP2_decoder = new JP2Decoder(QString(ui.GetFileName("FROM")));
JP2_decoder->OpenFile();
int nsamps = JP2_decoder->GetSampleDimension();
int nlines = JP2_decoder->GetLineDimension();
int nbands = JP2_decoder->GetBandDimension();
int pixelbytes = JP2_decoder->GetPixelBytes();
bool is_signed = JP2_decoder->GetSignedData();
delete JP2_decoder;
ProcessImport jp;
jp.SetDimensions(nsamps,nlines,nbands);
if (pixelbytes == 1) {
  jp.SetPixelType(Isis::UnsignedByte);
} else if (pixelbytes == 2) {
  if (is_signed) {
    jp.SetPixelType(Isis::SignedWord);
  } else {
    jp.SetPixelType(Isis::UnsignedWord);
  }
} else {
  throw iException::Message(iException::User,
    "The file [" + ui.GetFileName("FROM") + "] contains unsupported data type.",
    _FILEINFO_);
}
jp.SetInputFile(QString(ui.GetFileName("FROM")));
jp.SetOutputCube("TO");
jp.SetOrganization(ProcessImport::JP2);
jp.StartProcess();
jp.EndProcess();

If you would like to see JP2Decoder being used in implementation, see std2isis.cpp or for a class that implements JP2Decoder, see ProcessImport

Author

2009-12-18 Janet Barrett

Constructor & Destructor Documentation

Isis::JP2Decoder::JP2Decoder

(

const QString &

jp2file

)

Constructs a JPEG2000 decoder object.

Parameters

jp2file

The name of the JP2 file that needs to be decoded.

References _FILEINFO_.

Isis::JP2Decoder::~JP2Decoder

(

)

JP2Decoder destructor.

Member Function Documentation

int Isis::JP2Decoder::GetBandDimension ( ) const

inline

Referenced by Isis::JP2Importer::isArgb(), Isis::JP2Importer::isGrayscale(), Isis::JP2Importer::isRgb(), and Isis::JP2Importer::JP2Importer().

int Isis::JP2Decoder::GetLineDimension ( ) const

inline

Referenced by Isis::JP2Importer::JP2Importer().

int Isis::JP2Decoder::GetPixelBytes ( ) const

inline

Referenced by Isis::JP2Importer::JP2Importer().

int Isis::JP2Decoder::GetSampleDimension ( ) const

inline

Referenced by Isis::JP2Importer::JP2Importer().

bool Isis::JP2Decoder::GetSignedData ( ) const

inline

Referenced by Isis::JP2Importer::JP2Importer().

bool Isis::JP2Decoder::IsJP2 ( QString  filename )

static

Referenced by Isis::ImageImporter::fromFileName().

JP2Error* Isis::JP2Decoder::kakadu_error ( ) const

inline

void Isis::JP2Decoder::OpenFile

(

)

Open the JPEG2000 file.

References _FILEINFO_, MAX_STRIPE_HEIGHT, and MIN_STRIPE_HEIGHT.

Referenced by Isis::JP2Importer::JP2Importer().

void Isis::JP2Decoder::Read

(

unsigned char **

inbuf

)

Read data from JP2 file containing 8-bit data.

Parameters

inbuf

The array of pointers to byte buffers that will be used to read in the image data. One byte buffer is required for each band in the image. Kakadu reads in a BIL manner. It is up to the calling routine to do the casting necessary to convert the byte data to the actual pixel type (UnsignedByte, UnsignedWord, SignedWord).

Referenced by Isis::JP2Importer::updateRawBuffer().

void Isis::JP2Decoder::Read

(

short int **

inbuf

)

Read data from JP2 file containing 16-bit data.

Parameters

inbuf

The array of pointers to byte buffers that will be used to read in the image data. One byte buffer is required for each band in the image. Kakadu reads in a BIL manner. It is up to the calling routine to do the casting necessary to convert the byte data to the actual pixel type (UnsignedByte, UnsignedWord, SignedWord).

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The documentation for this class was generated from the following files:

• src/base/objs/JP2Decoder/JP2Decoder.h
• src/base/objs/JP2Decoder/JP2Decoder.cpp