com.openinventor.ldm.compressors

Class SoJp3dDataCompressor

java.lang.Object

com.openinventor.inventor.Inventor

com.openinventor.ldm.compressors.SoDataCompressor

com.openinventor.ldm.compressors.SoJp3dDataCompressor

public class SoJp3dDataCompressor
extends SoDataCompressor

JP3D data compression. This class implements a wavelet compression scheme based on JP3D compression, an extension of the standard JPEG2000 algorithms specifically designed for volume data. It supports lossless and lossy compression. This is controlled by setCompressionLevel (see SoDataCompressor or SoConvertedParameters). A compression level of 0 specifies the lossless mode. Any other value specifies the target PSNR (Peak Signal to Noise Ratio).

Typical values for compression level (PSNR):

• 0 specifies lossless mode.
• 70 stands for "near lossless" mode (~0.03% error). Most of the volume will be encoded losslessly, but some parts will be encoded with a little error.
• 40 is the "visually lossless" mode (~1% error). Some error will be introduced, but visually the volume will appear the same.

Limitations:

• The maximum precision supported is 16 bits.
  Data values larger than 16 bits, for example float or 32 bit integer, will be converted to 16 bit integers, potentially making the compression lossy.

See also:

SoGzipDataCompressor, SoJpegDataCompressor, SoDataCompressor, SoConverterParameters

Nested Class Summary

Nested classes/interfaces inherited from class com.openinventor.inventor.Inventor

Inventor.ConstructorCommand

Field Summary

Fields inherited from class com.openinventor.inventor.Inventor

VERBOSE_LEVEL, ZeroHandle

Constructor Summary

Constructors

Constructor and Description
SoJp3dDataCompressor() Constructor.

Method Summary

Methods inherited from class com.openinventor.ldm.compressors.SoDataCompressor

allocateCompressedBuffer, crc32, getAppropriateCompressor, getCompressedBuffer, getCompressionFormatName, getCompressionLevel, isLossless, setCompressionLevel

Methods inherited from class com.openinventor.inventor.Inventor

dispose, getAddress, getNativeResourceHandle, startInternalThreads, stopInternalThreads

Methods inherited from class java.lang.Object

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

Constructor Detail

SoJp3dDataCompressor

public SoJp3dDataCompressor()

Constructor.