Package nom.tam.image.compression.tile.mask

Class NullPixelMaskPreserver

java.lang.Object

nom.tam.image.compression.tile.mask.AbstractNullPixelMask

nom.tam.image.compression.tile.mask.NullPixelMaskPreserver

public class NullPixelMaskPreserver
extends AbstractNullPixelMask

(for internal use) Preserves blank (null) values in compressed images. This class overwrites the pixels specified in the mask with null values. Where the null value can be defined separately.

See Also:

• CompressedImageHDU

Field Summary

Fields inherited from class nom.tam.image.compression.tile.mask.AbstractNullPixelMask

NULL_INDICATOR

Constructor Summary

Constructors

Constructor	Description
NullPixelMaskPreserver(TileBuffer tileBuffer, int tileIndex, long nullValue, ICompressorControl compressorControl)	Creates a new instance for preserving the null values in a specific image tile when compressing the tile.

Method Summary

Modifier and Type	Method	Description
void	preserveNull()	Creates a compressed mask to store along with the compressed tile image to indicate where the blanking values appear in in the original image.

Methods inherited from class nom.tam.image.compression.tile.mask.AbstractNullPixelMask

getCompressorControl, getMask, getMaskBytes, getNullValue, getTileBuffer, getTileIndex, initializedMask, setMask

Methods inherited from class java.lang.Object

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

Constructor Details

NullPixelMaskPreserver

public NullPixelMaskPreserver(TileBuffer tileBuffer,
 int tileIndex,
 long nullValue,
 ICompressorControl compressorControl)

Creates a new instance for preserving the null values in a specific image tile when compressing the tile.

Parameters:

tileBuffer - the buffer containing the serialized tile data (still uncompressed)

tileIndex - the sequential tile index

nullValue - the blank value used in integer type images (this is ignored for floating-point images where NaN is used always)

compressorControl - the class that performs the compresion of tiles, and which will be used to compress the null pixel mask also.

Method Details

preserveNull

public void preserveNull()

Creates a compressed mask to store along with the compressed tile image to indicate where the blanking values appear in in the original image.