colorspace

Class Resampler

java.lang.Object

jj2000.j2k.image.ImgDataAdapter

colorspace.ColorSpaceMapper

colorspace.Resampler

All Implemented Interfaces:

BlkImgDataSrc, ImgData

public class Resampler
extends ColorSpaceMapper

This class resamples the components of an image so that all have the same number of samples. The current implementation only handles the case of 2:1 upsampling.

Version:

1.0

Author:

Bruce A. Kern

See Also:

jj2000.j2k.colorspace.ColorSpace

Nested Class Summary

Nested classes/interfaces inherited from class colorspace.ColorSpaceMapper

ColorSpaceMapper.ComputedComponents

Field Summary

Fields inherited from class colorspace.ColorSpaceMapper

computed, csMap, dataFloat, dataInt, eol, fixedPtBitsArray, inFloat, inInt, maxValueArray, ncomps, OPT_PREFIX, pl, shiftValueArray, src, srcBlk, workDataFloat, workDataInt, workFloat, workInt

Fields inherited from class jj2000.j2k.image.ImgDataAdapter

imgdatasrc, tIdx

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Resampler(BlkImgDataSrc src, ColorSpace csMap) Ctor resamples a BlkImgDataSrc so that all components have the same number of samples.

Method Summary

Methods

Modifier and Type	Method and Description
static BlkImgDataSrc	createInstance(BlkImgDataSrc src, ColorSpace csMap) Factory method for creating instances of this class.
DataBlk	getCompData(DataBlk outblk, int c) Returns, in the blk argument, a block of image data containing the specifed rectangular area, in the specified component.
int	getCompImgHeight(int c) Returns the height in pixels of the specified component in the overall image.
int	getCompImgWidth(int c) Returns the width in pixels of the specified component in the overall image.
int	getCompSubsX(int c) Returns the component subsampling factor in the horizontal direction, for the specified component.
int	getCompSubsY(int c) Returns the component subsampling factor in the vertical direction, for the specified component.
DataBlk	getInternCompData(DataBlk outblk, int c) Return a DataBlk containing the requested component upsampled by the scale factor applied to the particular scaling direction Returns, in the blk argument, a block of image data containing the specifed rectangular area, in the specified component.
int	getTileCompHeight(int t, int c) Returns the height in pixels of the specified tile-component.
int	getTileCompWidth(int t, int c) Returns the width in pixels of the specified tile-component..
String	toString() Return an appropriate String representation of this Resampler instance.

Methods inherited from class colorspace.ColorSpaceMapper

copyGeometry, getFixedPoint, getParameterInfo, setInternalBuffer

Methods inherited from class jj2000.j2k.image.ImgDataAdapter

getCompULX, getCompULY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomRangeBits, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getTile, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth, nextTile, setTile

Methods inherited from class java.lang.Object

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

Methods inherited from interface jj2000.j2k.image.ImgData

getCompULX, getCompULY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomRangeBits, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getTile, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth, nextTile, setTile

Constructor Detail

Resampler

protected Resampler(BlkImgDataSrc src,
         ColorSpace csMap)
             throws ColorSpaceException

Ctor resamples a BlkImgDataSrc so that all components have the same number of samples. Note the present implementation does only two to one respampling in either direction (row, column).

Parameters:

src - -- Source of image data

csm - -- provides colorspace info

Throws:

ColorSpaceException

Method Detail

createInstance

public static BlkImgDataSrc createInstance(BlkImgDataSrc src,
                           ColorSpace csMap)
                                    throws ColorSpaceException

Factory method for creating instances of this class.

Parameters:

src - -- source of image data

csMap - -- provides colorspace info

Returns:

Resampler instance

Throws:

ColorSpaceException

getInternCompData

public DataBlk getInternCompData(DataBlk outblk,
                        int c)

Return a DataBlk containing the requested component upsampled by the scale factor applied to the particular scaling direction Returns, in the blk argument, a block of image data containing the specifed rectangular area, in the specified component. The data is returned, as a copy of the internal data, therefore the returned data can be modified "in place".

The rectangular area to return is specified by the 'ulx', 'uly', 'w' and 'h' members of the 'blk' argument, relative to the current tile. These members are not modified by this method. The 'offset' of the returned data is 0, and the 'scanw' is the same as the block's width. See the 'DataBlk' class.

If the data array in 'blk' is 'null', then a new one is created. If the data array is not 'null' then it is reused, and it must be large enough to contain the block's data. Otherwise an 'ArrayStoreException' or an 'IndexOutOfBoundsException' is thrown by the Java system.

The returned data has its 'progressive' attribute set to that of the input data.

Specified by:

getInternCompData in interface BlkImgDataSrc

Overrides:

getInternCompData in class ColorSpaceMapper

Parameters:

blk - Its coordinates and dimensions specify the area to return. If it contains a non-null data array, then it must have the correct dimensions. If it contains a null data array a new one is created. The fields in this object are modified to return the data.

c - The index of the component from which to get the data. Only 0 and 3 are valid.

Returns:

The requested DataBlk

See Also:

getCompData(jj2000.j2k.image.DataBlk, int)

toString

public String toString()

Return an appropriate String representation of this Resampler instance.

Overrides:

toString in class Object

getCompData

public DataBlk getCompData(DataBlk outblk,
                  int c)

Returns, in the blk argument, a block of image data containing the specifed rectangular area, in the specified component. The data is returned, as a copy of the internal data, therefore the returned data can be modified "in place".

The rectangular area to return is specified by the 'ulx', 'uly', 'w' and 'h' members of the 'blk' argument, relative to the current tile. These members are not modified by this method. The 'offset' of the returned data is 0, and the 'scanw' is the same as the block's width. See the 'DataBlk' class.

If the data array in 'blk' is 'null', then a new one is created. If the data array is not 'null' then it is reused, and it must be large enough to contain the block's data. Otherwise an 'ArrayStoreException' or an 'IndexOutOfBoundsException' is thrown by the Java system.

The returned data has its 'progressive' attribute set to that of the input data.

Specified by:

getCompData in interface BlkImgDataSrc

Overrides:

getCompData in class ColorSpaceMapper

Parameters:

blk - Its coordinates and dimensions specify the area to return. If it contains a non-null data array, then it must have the correct dimensions. If it contains a null data array a new one is created. The fields in this object are modified to return the data.

c - The index of the component from which to get the data. Only 0 and 3 are valid.

Returns:

The requested DataBlk

See Also:

getInternCompData(jj2000.j2k.image.DataBlk, int)

getCompImgHeight

public int getCompImgHeight(int c)

Returns the height in pixels of the specified component in the overall image.

Specified by:

getCompImgHeight in interface ImgData

Overrides:

getCompImgHeight in class ImgDataAdapter

Parameters:

c - The index of the component, from 0 to N-1.

Returns:

The height in pixels of component c in the overall image.

getCompImgWidth

public int getCompImgWidth(int c)

Returns the width in pixels of the specified component in the overall image.

Specified by:

getCompImgWidth in interface ImgData

Overrides:

getCompImgWidth in class ImgDataAdapter

Parameters:

c - The index of the component, from 0 to N-1.

Returns:

The width in pixels of component c in the overall image.

getCompSubsX

public int getCompSubsX(int c)

Returns the component subsampling factor in the horizontal direction, for the specified component.

Specified by:

getCompSubsX in interface ImgData

Overrides:

getCompSubsX in class ImgDataAdapter

Parameters:

c - The index of the component (between 0 and N-1)

Returns:

The horizontal subsampling factor of component 'c'

See Also:

ImgData

getCompSubsY

public int getCompSubsY(int c)

Returns the component subsampling factor in the vertical direction, for the specified component.

Specified by:

getCompSubsY in interface ImgData

Overrides:

getCompSubsY in class ImgDataAdapter

Parameters:

c - The index of the component (between 0 and N-1)

Returns:

The vertical subsampling factor of component 'c'

See Also:

ImgData

getTileCompHeight

public int getTileCompHeight(int t,
                    int c)

Returns the height in pixels of the specified tile-component.

Specified by:

getTileCompHeight in interface ImgData

Overrides:

getTileCompHeight in class ImgDataAdapter

Parameters:

t - The tile index.

c - The index of the component, from 0 to N-1.

Returns:

The height in pixels of component c in tile t.

getTileCompWidth

public int getTileCompWidth(int t,
                   int c)

Returns the width in pixels of the specified tile-component..

Specified by:

getTileCompWidth in interface ImgData

Overrides:

getTileCompWidth in class ImgDataAdapter

Parameters:

t - Tile index

c - The index of the component, from 0 to N-1.

Returns:

The width in pixels of component c in tilet.