org.openimaj.image.feature.global

Class RGBRMSContrast

java.lang.Object

org.openimaj.image.feature.global.RGBRMSContrast

All Implemented Interfaces:

FeatureVectorProvider<DoubleFV>, ImageAnalyser<MBFImage>

@Reference(type=Inproceedings,
           author={"Jose San Pedro","Stefan Siersdorfer"},
           title="Ranking and Classifying Attractiveness of Photos in Folksonomies",
           year="2009",
           booktitle="18th International World Wide Web Conference",
           pages={"771","","771"},
           url="http://www2009.eprints.org/78/",
           month="April")
public class RGBRMSContrast
extends Object
implements ImageAnalyser<MBFImage>, FeatureVectorProvider<DoubleFV>

Implementation of the RGB RMS contrast feature.

See the referenced paper for a description. The original python looked like:

 cdata = image.getdata()
 center = [0.0,0.0,0.0]
 
 for v in cdata:
  center[0]+=v[0]
        center[1]+=v[1]
        center[2]+=v[2]
 
 for i in xrange(len(center)):
  center[i]/=len(cdata) #mean vector of the RGB values
        
 contrast2 = 0.0
 for v in cdata:
  contrast2 += ((v[0]-center[0])**2) + ((v[1]-center[1])**2) + ((v[2]-center[2])**2) #norm of differences wrt the mean
 contrast2 /= len(cdata)
 

Author:

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

Constructor Summary

Constructors

Constructor and Description
RGBRMSContrast()

Method Summary

Modifier and Type	Method and Description
void	analyseImage(MBFImage image) Analyse an image.
double	getContrast() Get the contrast of the last image analysed with analyseImage(MBFImage)
DoubleFV	getFeatureVector() Get the FeatureVector associated with this object.

Methods inherited from class java.lang.Object

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

Constructor Detail

RGBRMSContrast

public RGBRMSContrast()

Method Detail

getFeatureVector

public DoubleFV getFeatureVector()

Description copied from interface: FeatureVectorProvider

Get the FeatureVector associated with this object.

Specified by:

getFeatureVector in interface FeatureVectorProvider<DoubleFV>

Returns:

the feature vector.

analyseImage

public void analyseImage(MBFImage image)

Description copied from interface: ImageAnalyser

Analyse an image.

Specified by:

analyseImage in interface ImageAnalyser<MBFImage>

Parameters:

image - The image to process in place.

getContrast

public double getContrast()

Get the contrast of the last image analysed with analyseImage(MBFImage)

Returns:

the contrast