org.openimaj.image.processing.face.feature.comparison

Class ReversedLtpDtFeatureComparator

java.lang.Object

org.openimaj.image.processing.face.feature.comparison.ReversedLtpDtFeatureComparator

All Implemented Interfaces:

FacialFeatureComparator<LtpDtFeature>, ReadableBinary, ReadWriteableBinary, WriteableBinary, DistanceComparator<LtpDtFeature>

@Reference(type=Article,
           author={"Tan, Xiaoyang","Triggs, Bill"},
           title="Enhanced local texture feature sets for face recognition under difficult lighting conditions",
           year="2010",
           journal="Trans. Img. Proc.",
           pages={"1635","1650"},
           url="http://dx.doi.org/10.1109/TIP.2010.2042645",
           month="June",
           number="6",
           publisher="IEEE Press",
           volume="19")
public class ReversedLtpDtFeatureComparator
extends Object
implements FacialFeatureComparator<LtpDtFeature>

A comparator for Local Trinary Pattern Features using a Euclidean distance transform.

This comparator differs from that described in the original paper as it computes the distance map only on the query, rather than on each database target. This increases query time, but requires less memory.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Constructor Summary

Constructors

Constructor and Description
ReversedLtpDtFeatureComparator()

Method Summary

Modifier and Type	Method and Description
byte[]	binaryHeader() Header for binary input.
double	compare(LtpDtFeature query, LtpDtFeature target) Compare two objects, returning a score or distance.
boolean	isDistance()
void	readBinary(DataInput in) Read internal state from in.
String	toString()
void	writeBinary(DataOutput out) Write the content of this as binary to out.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReversedLtpDtFeatureComparator

public ReversedLtpDtFeatureComparator()

Method Detail

compare

public double compare(LtpDtFeature query,
                      LtpDtFeature target)

Description copied from interface: DistanceComparator

Compare two objects, returning a score or distance.

Specified by:

compare in interface DistanceComparator<LtpDtFeature>

Parameters:

query - the first object

target - the second object

Returns:

a score or distance

isDistance

public boolean isDistance()

Specified by:

isDistance in interface DistanceComparator<LtpDtFeature>

Returns:

true if the comparison is a distance; false if similarity.

readBinary

public void readBinary(DataInput in)
                throws IOException

Description copied from interface: ReadableBinary

Read internal state from in.

Specified by:

readBinary in interface ReadableBinary

Parameters:

in - source to read from.

Throws:

IOException - an error reading input

binaryHeader

public byte[] binaryHeader()

Description copied from interface: ReadableBinary

Header for binary input. Will be automatically read by IOUtils when using readBinary().

Specified by:

binaryHeader in interface ReadableBinary

Specified by:

binaryHeader in interface WriteableBinary

Returns:

header

writeBinary

public void writeBinary(DataOutput out)
                 throws IOException

Description copied from interface: WriteableBinary

Write the content of this as binary to out.

Specified by:

writeBinary in interface WriteableBinary

Parameters:

out - sink to write to

Throws:

IOException - an error writing to out

toString

public String toString()

Overrides:

toString in class Object