InvCompTransf Class

This class apply inverse component transformations to the tiles depending on specification read from the codestream header. 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).

Inheritance

object

ImgDataAdapter

InvCompTransf

Implements

BlkImgDataSrc

ImgData

Namespace: CSJ2K.j2k.image.invcomptransf

Assembly: C1.WPF.ReportViewer.4.6.2.dll

Syntax

public class InvCompTransf : ImgDataAdapter, BlkImgDataSrc, ImgData

Public Class InvCompTransf
    Inherits ImgDataAdapter
    Implements BlkImgDataSrc, ImgData

Constructors

Name	Description
InvCompTransf(BlkImgDataSrc, DecoderSpecs, int[], ParameterList)	Constructs a new ForwCompTransf object that operates on the specified source of image data.

Fields

Name	Description
INV_ICT	Identifier for the Inverse Irreversible Component Transformation (INV_ICT). Value is 2
INV_RCT	Identifier for the Inverse Reversible Component Transformation (INV_RCT). Value is 1.
NONE	Identifier for no component transformation. Value is 0.
OPT_PREFIX	The prefix for inverse component transformation options: 'M'

Properties

Name	Description
ParameterInfo	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.
Reversible	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).

Name

Description

ParameterInfo

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.

Reversible

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).

Methods

Name	Description
ToString()	Returns a string with a descriptive text of which inverse component transformation is used. This can be either "Inverse RCT" or "Inverse ICT" or "No component transformation" depending on the current tile.
calcMixedBitDepths(int[], int, int[])	Calculates the bitdepths of the transformed components, given the bitdepth of the un-transformed components and the component tranformation type.
getCompData(DataBlk, int)
getFixedPoint(int)	Returns the position of the fixed point in the specified component, or equivalently the number of fractional bits. 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.
getInternCompData(DataBlk, int)	Apply the inverse 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 (invRCT or invICT).
getNomRangeBits(int)
nextTile()	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). `<p>This default implementation just advances to the next tile in the source.</p>`
setTile(int, int)	Changes the current tile, given the new indexes. An IllegalArgumentException is thrown if the indexes do not correspond to a valid tile. `<p>This default implementation just changes the tile in the source.</p>`