| java.lang.Object
 jj2000.j2k.image.ImgDataAdapter
jj2000.j2k.image.forwcomptransf.ForwCompTransf
| ForwCompTransf | | public class ForwCompTransf extends ImgDataAdapter implements BlkImgDataSrc(Code) | | This class apply component transformations to the tiles depending
on user specifications. These transformations can be used to
improve compression efficiency but are not related to colour
transforms used to map colour values for display purposes. JPEG
2000 part I defines 2 component transformations: RCT (Reversible
Component Transformation) and ICT (Irreversible Component
Transformation).
See Also: ModuleSpec |
| Field Summary | |
| final public static int | FORW_ICT
Identifier for the Forward Irreversible Component
Transformation (FORW_ICT). | | final public static int | FORW_RCT
Identifier for the Forward Reversible Component Transformation
(FORW_RCT). | | final public static int | NONE
Identifier for no component transformation. | | final public static char | OPT_PREFIX
|
| Method Summary | |
| public static int[] | calcMixedBitDepths(int ntdepth, int ttype, int tdepth)
Calculates the bitdepths of the transformed components, given the
bitdepth of the un-transformed components and the component
tranformation type.
Parameters:
ntdepth - The bitdepth of each non-transformed components.
Parameters:
ttype - The type ID of the component transformation.
Parameters:
tdepth - If not null the results are stored in thisarray, otherwise a new array is allocated and returned. | | public DataBlk | getCompData(DataBlk blk, int c)
Apply forward component transformation associated with the current
tile. | | public int | getFixedPoint(int c)
Returns the position of the fixed point in the specified
component. | | public DataBlk | getInternCompData(DataBlk blk, int c)
Apply the component transformation associated with the current tile. | | public int | getNomRangeBits(int c)
Returns the number of bits, referred to as the "range bits",
corresponding to the nominal range of the data in the specified
component and in the current tile. | | public static String[][] | getParameterInfo()
Returns the parameters that are used in this class and implementing
classes. | | public boolean | isReversible()
Returns true if this transform is reversible in current
tile. | | public void | nextTile()
Advances to the next tile, in standard scan-line order (by rows then
columns). | | public void | setTile(int x, int y)
Changes the current tile, given the new indexes. | | public String | toString()
Returns a string with a descriptive text of which forward component
transformation is used. |
| FORW_ICT | | final public static int FORW_ICT(Code) | | Identifier for the Forward Irreversible Component
Transformation (FORW_ICT). Value is 2
|
| FORW_RCT | | final public static int FORW_RCT(Code) | | Identifier for the Forward Reversible Component Transformation
(FORW_RCT). Value is 1.
|
| NONE | | final public static int NONE(Code) | | Identifier for no component transformation. Value is 0.
|
| OPT_PREFIX | | final public static char OPT_PREFIX(Code) | | The prefix for component transformation type: 'M'
|
| ForwCompTransf | | public ForwCompTransf(BlkImgDataSrc imgSrc, J2KImageWriteParamJava wp)(Code) | | Constructs a new ForwCompTransf object that operates on the
specified source of image data.
Parameters:
imgSrc - The source from where to get the data to betransformed
Parameters:
encSpec - The encoder specifications
See Also: BlkImgDataSrc |
| calcMixedBitDepths | | public static int[] calcMixedBitDepths(int ntdepth, int ttype, int tdepth)(Code) | | Calculates the bitdepths of the transformed components, given the
bitdepth of the un-transformed components and the component
tranformation type.
Parameters:
ntdepth - The bitdepth of each non-transformed components.
Parameters:
ttype - The type ID of the component transformation.
Parameters:
tdepth - If not null the results are stored in thisarray, otherwise a new array is allocated and returned. The bitdepth of each transformed component. |
| getCompData | | public DataBlk getCompData(DataBlk blk, int c)(Code) | | Apply forward component transformation associated with the current
tile. If no component transformation has been requested by the user,
data are not modified.
This method calls the getInternCompData() method, but respects the
definitions of the getCompData() method defined in the BlkImgDataSrc
interface.
Parameters:
blk - Determines the rectangular area to return, and thedata is returned in this object.
Parameters:
c - Index of the output component. The requested DataBlk
See Also: BlkImgDataSrc.getCompData |
| getFixedPoint | | public int getFixedPoint(int c)(Code) | | Returns the position of the fixed point in the specified
component. This is the position of the least significant integral
(i.e. non-fractional) bit, which is equivalent to the number of
fractional bits. For instance, for fixed-point values with 2 fractional
bits, 2 is returned. For floating-point data this value does not apply
and 0 should be returned. Position 0 is the position of the least
significant bit in the data.
This default implementation assumes that the number of
fractional bits is not modified by the component mixer.
Parameters:
c - The index of the component. The value of the fixed point position of the sourcesince the color transform does not affect it. |
| getInternCompData | | public DataBlk getInternCompData(DataBlk blk, int c)(Code) | | Apply the component transformation associated with the current tile. If
no component transformation has been requested by the user, data are
not modified. Else, appropriate method is called (forwRCT or forwICT).
See Also: ForwCompTransf.forwRCT
See Also: ForwCompTransf.forwICT
Parameters:
blk - Determines the rectangular area to return.
Parameters:
c - Index of the output component. The requested DataBlk |
| getNomRangeBits | | public int getNomRangeBits(int c)(Code) | | Returns the number of bits, referred to as the "range bits",
corresponding to the nominal range of the data in the specified
component and in the current tile. If this number is b then for
unsigned data the nominal range is between 0 and 2^b-1, and for signed
data it is between -2^(b-1) and 2^(b-1)-1. Note that this value can be
affected by the multiple component transform.
Parameters:
c - The index of the component. The bitdepth of component 'c' after mixing. |
| getParameterInfo | | public static String[][] getParameterInfo()(Code) | | Returns the parameters that are used in this class and implementing
classes. It returns a 2D String array. Each of the 1D arrays is for a
different option, and they have 4 elements. The first element is the
option name, the second one is the synopsis, the third one is a long
description of what the parameter is and the fourth is its default
value. The synopsis or description may be 'null', in which case it is
assumed that there is no synopsis or description of the option,
respectively. Null may be returned if no options are supported.
the options name, their synopsis and their explanation,or null if no options are supported. |
| isReversible | | public boolean isReversible()(Code) | | Returns true if this transform is reversible in current
tile. Reversible component transformations are those which operation
can be completely reversed without any loss of information (not even
due to rounding).
Reversibility of component transformation in current tile |
| nextTile | | public void nextTile()(Code) | | Advances to the next tile, in standard scan-line order (by rows then
columns). An NoNextElementException is thrown if the current tile is
the last one (i.e. there is no next tile).
This default implementation just advances to the next tile in the
source and re-initializes properly component transformation variables.
|
| setTile | | public void setTile(int x, int y)(Code) | | Changes the current tile, given the new indexes. An
IllegalArgumentException is thrown if the indexes do not correspond to
a valid tile.
This default implementation changes the tile in the source and
re-initializes properly component transformation variables..
Parameters:
x - The horizontal index of the tile.
Parameters:
y - The vertical index of the new tile. |
| toString | | public String toString()(Code) | | Returns a string with a descriptive text of which forward component
transformation is used. This can be either "Forward RCT" or "Forward
ICT" or "No component transformation" depending on the current tile.
A descriptive string |
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