org.openimaj.image.feature.global

Class SharpPixelProportion

java.lang.Object

org.openimaj.image.feature.global.SharpPixelProportion

All Implemented Interfaces:

FeatureVectorProvider<DoubleFV>, ImageAnalyser<FImage>

@Reference(type=Inproceedings,author={"Ke, Yan","Tang, Xiaoou","Jing, Feng"},title="The Design of High-Level Features for Photo Quality Assessment",year="2006",booktitle="Proceedings of the 2006 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - Volume 1",pages={"419","","426"},url="http://dx.doi.org/10.1109/CVPR.2006.303",publisher="IEEE Computer Society",series="CVPR \'06",customData={"isbn","0-7695-2597-0","numpages","8","doi","10.1109/CVPR.2006.303","acmid","1153495","address","Washington, DC, USA"}) @Reference(type=Inproceedings,author={"Che-Hua Yeh","Yuan-Chen Ho","Brian A. Barsky","Ming Ouhyoung"},title="Personalized Photograph Ranking and Selection System",year="2010",booktitle="Proceedings of ACM Multimedia",pages={"211","220"},month="October",customData={"location","Florence, Italy"})
public class SharpPixelProportion
extends Object
implements ImageAnalyser<FImage>, FeatureVectorProvider<DoubleFV>

Implementation of the blur estimation feature described by Ke, Tang and Jing, and Yeh et al.

Basically, this technique estimates the proportion of blurred pixels by thresholding the power-spectrum (magnitude) of the FFT of the image. Results are in the range 0-1. A higher number implies a sharper image.

Author:

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

Constructor Summary

Constructors

Constructor and Description
SharpPixelProportion() Construct with a default threshold on Fourier magnitude of 2.0.
SharpPixelProportion(float threshold) Construct with the given threshold on Fourier magnitude.

Method Summary

Modifier and Type	Method and Description
void	analyseImage(FImage image) Analyse an image.
double	getBlurredPixelProportion()
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

SharpPixelProportion

public SharpPixelProportion()

Construct with a default threshold on Fourier magnitude of 2.0.

SharpPixelProportion

public SharpPixelProportion(float threshold)

Construct with the given threshold on Fourier magnitude.

Parameters:

threshold - the threshold

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(FImage image)

Description copied from interface: ImageAnalyser

Analyse an image.

Specified by:

analyseImage in interface ImageAnalyser<FImage>

Parameters:

image - The image to process in place.

getBlurredPixelProportion

public double getBlurredPixelProportion()

Returns:

the proportion of blurred pixels (those with a Fourier magnitude above the threshold)