de.digitalcollections.openjpeg

Class OpenJpeg

java.lang.Object

de.digitalcollections.openjpeg.OpenJpeg

public class OpenJpeg
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
libopenjp2	lib
jnr.ffi.Runtime	runtime

Constructor Summary

Constructors

Constructor and Description
OpenJpeg() Load the library.

Method Summary

Modifier and Type	Method and Description
BufferedImage	decode(InStreamWrapper wrapper, Rectangle area, int reduceFactor) Decode the JPEG2000 image in the input stream to a BufferedImage.
void	encode(Raster img, OutStreamWrapper output, opj_cparameters params) Encode a raster image to a JPEG2000 image.
Info	getInfo(InStreamWrapper wrapper) Obtain information about the JPEG200 image in the input stream.

Methods inherited from class java.lang.Object

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

Field Detail

lib

public libopenjp2 lib

runtime

public jnr.ffi.Runtime runtime

Constructor Detail

OpenJpeg

public OpenJpeg()

Load the library.

Method Detail

getInfo

public Info getInfo(InStreamWrapper wrapper)
             throws IOException

Obtain information about the JPEG200 image in the input stream.

Throws:

IOException

decode

public BufferedImage decode(InStreamWrapper wrapper,
                            Rectangle area,
                            int reduceFactor)
                     throws IOException

Decode the JPEG2000 image in the input stream to a BufferedImage.

Parameters:

wrapper - Wrapper around the input stream pointing to the image

area - Region of the image to decode

reduceFactor - Scale down the image by a factor of 2^reduceFactor

Returns:

the decoded image

Throws:

IOException - if there's a problem decoding the image

encode

public void encode(Raster img,
                   OutStreamWrapper output,
                   opj_cparameters params)
            throws IOException

Encode a raster image to a JPEG2000 image.

Parameters:

img - image to encode

output - wrapped OutputStream the image should be written to

params - encoding parameters

Throws:

IOException - if encoding fails