de.unihalle.informatik.MiToBo.features.texture.lbp

Class FeatureCalculatorLBPRIULUTs

java.lang.Object

de.unihalle.informatik.MiToBo.features.texture.lbp.FeatureCalculatorLBPRIULUTs

public class FeatureCalculatorLBPRIULUTs
extends Object

Class keeping look-up tables for rotation invariant LBP codes.

This class basically contains various static arrays with rotation-invariant LBP codes. The arrays are initialized at the time of first access. Note that this may take some time depending on the power of your computer. Furthermore at least 1 GB of RAM should be available.

The theory regarding rotation invariant LBP codes can be found in
Ojala et al, Multiresolution Gray-Scale and Rotation Invariant Texture Classification with Local Binary Patterns, PAMI, vol. 24, no. 7, pp. 971-987, July 2002.

Author:

Birgit Moeller

See Also:

FeatureCalculatorLBPOriginal, FeatureCalculatorLBP

Field Summary

Fields

Modifier and Type	Field and Description
static int[][]	codeArrayRI Array containing rotation invariant LBP codes.
static int[][]	codeArrayRIU Array containing uniform rotation invariant LBP codes.
static int[][]	codeDistributionRI Distribution of codes.
private static int	maxBitsSoFar Maximal bit number for which the class has already been initialized.

Constructor Summary

Constructors

Constructor and Description
FeatureCalculatorLBPRIULUTs()

Method Summary

Modifier and Type	Method and Description
static int[][]	getCodeDistributionRI(int maxBits) Get array with LBP-RI code distributions.
static int[][]	getLBPCodeArrayRI(int maxBits) Get array with LBP rotation invariant codes.
static int[][]	getLBPCodeArrayRIU(int maxBits) Get array with LBP rotation invariant uniform codes.
protected static void	initArrayRI(int maxBits) Initializes the array with rotation invariant and uniform codes.
protected static void	initArrayRIU(int maxBits) Initializes the array with rotation invariant and uniform codes.
static void	main(String[] args) Test function.

Methods inherited from class java.lang.Object

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

Field Detail

codeArrayRI

public static int[][] codeArrayRI

Array containing rotation invariant LBP codes.

The array has 2^24 rows and 4 columns. Each column contains a certain unified code for the index:

• 1st column: 8-bit representation
• 2nd column: 16-bit representation
• 3rd column: 12-bit representation
• 4th column: 24-bit representation

The codes are calculated by shifting the binary representation of the index such that a maximal number of zeros is located at the left end of the code and the overall number encoded is minimal.

codeArrayRIU

public static int[][] codeArrayRIU

Array containing uniform rotation invariant LBP codes.

The array has 2^24 rows and 4 columns. Each column contains a certain unified code for the index:

• 1st column: 8-bit representation
• 2nd column: 16-bit representation
• 3rd column: 12-bit representation
• 4th column: 24-bit representation

The codes are calculated by first determining the number U of 0-1 or 1-0 changes in the binary representation of a given index. For indices with U not larger than 2 the code is then given by counting the number of ones, all other indices get a code the number of bits considered plus one.

codeDistributionRI

public static int[][] codeDistributionRI

Distribution of codes.

The array has 2^24 rows and 4 columns. Each column contains the number of appearances of the index as LBP code given the corresponding number of bits:

• 1st column: 8-bit representation
• 2nd column: 16-bit representation
• 3rd column: 12-bit representation
• 4th column: 24-bit representation

maxBitsSoFar

private static int maxBitsSoFar

Maximal bit number for which the class has already been initialized.

By storing the maximum bit number already handled we seek to avoid doing time-consuming calculations multiple times.

Constructor Detail

FeatureCalculatorLBPRIULUTs

public FeatureCalculatorLBPRIULUTs()

Method Detail

getLBPCodeArrayRI

public static int[][] getLBPCodeArrayRI(int maxBits)

Get array with LBP rotation invariant codes.

Parameters:

maxBits - Maximal number of bits to consider.

Returns:

Array with codes.

getLBPCodeArrayRIU

public static int[][] getLBPCodeArrayRIU(int maxBits)

Get array with LBP rotation invariant uniform codes.

Parameters:

maxBits - Maximal number of bits to consider.

Returns:

Array with codes.

getCodeDistributionRI

public static int[][] getCodeDistributionRI(int maxBits)

Get array with LBP-RI code distributions.

Parameters:

maxBits - Maximal number of bits to consider.

Returns:

Array with code counts.

initArrayRI

protected static void initArrayRI(int maxBits)

Initializes the array with rotation invariant and uniform codes.

Note that particularly the 24-bit codes take a rather long time for initialization and at least 1 GB RAM.

Parameters:

maxBits - Maximal number of bits to consider.

initArrayRIU

protected static void initArrayRIU(int maxBits)

Initializes the array with rotation invariant and uniform codes.

Parameters:

maxBits - Maximal number of bits to consider.

main

public static void main(String[] args)

Test function.

Parameters:

args - Command-line arguments.