jjil.algorithm
Class GrayLookup

java.lang.Object
  jjil.core.PipelineStage
      jjil.algorithm.GrayLookup

public class GrayLookup
extends PipelineStage

Pipeline stage applies a lookup table to an image. The lookup table can be supplied through the constructor or by the setTable procedure. This pipeline stage modifies its input.

Author:

webb

Constructor Summary

GrayLookup(byte[] table)
Creates a new instance of GrayLookup.

Method Summary

byte[]	getTable() Return the lookup table currently being used.
void	push(Image image) Maps input Gray8Image through the lookup table, replacing values in the image.
void	setTable(byte[] table) Assign a new lookup table.

Methods inherited from class jjil.core.PipelineStage

getFront, isEmpty

Methods inherited from class java.lang.Object

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

Constructor Detail

GrayLookup

public GrayLookup(byte[] table)
           throws Error

Creates a new instance of GrayLookup.

Parameters:

table - The mapping table. Element i maps gray value Byte.MinValue + i to table[i].

Throws:

Error - when table is not a 256-element array.

Method Detail

getTable

public byte[] getTable()

Return the lookup table currently being used.

Returns:

the lookup table.

push

public void push(Image image)
          throws Error

Maps input Gray8Image through the lookup table, replacing values in the image.

Specified by:

push in class PipelineStage

Parameters:

image - the input image (output replaces input).

Throws:

Error - if image is not a Gray8Image.

setTable

public void setTable(byte[] table)
              throws Error

Assign a new lookup table. Images passed to push() after setTable is called will be mapped by the new image.

Parameters:

table - The lookup table. Input image value g is mapped to table[g + Byte.MinValue]

Throws:

Error - if table is not a 256-element array.