Catalano.Imaging.Corners

Class Fast9

java.lang.Object

Catalano.Imaging.Corners.Fast9

All Implemented Interfaces:

ICornersFeatureDetector

public class Fast9
extends java.lang.Object
implements ICornersFeatureDetector

Features from Accelerated Segment Test (FAST) corners detector. In the FAST corner detection algorithm, a pixel is defined as a corner if (in a circle surrounding the pixel), N or more contiguous pixels are all significantly brighter then or all significantly darker than the center pixel. The ordering of questions used to classify a pixel is learned using the ID3 algorithm. This detector has been shown to exibit a high degree of repeatability.

Constructor Summary

Constructors

Constructor and Description
Fast9() Initializes a new instance of the FastCornersDetector class.
Fast9(int threshold) Initializes a new instance of the FastCornersDetector class.
Fast9(int threshold, boolean suppress) Initializes a new instance of the FastCornersDetector class.

Method Summary

Modifier and Type	Method and Description
int	getThreshold() Get Threshold.
boolean	isSuppressed() Check if needs apply a non-maximum suppression algorithm on the results, to allow only maximal corners.
java.util.List<FeaturePoint>	ProcessImage(FastBitmap fastBitmap) Process image.
void	setSuppression(boolean suppress) Set suppression if needs apply a non-maximum suppression algorithm on the results, to allow only maximal corners.
void	setThreshold(int threshold) Set Threshold.

Methods inherited from class java.lang.Object

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

Constructor Detail

Fast9

public Fast9()

Initializes a new instance of the FastCornersDetector class.

Fast9

public Fast9(int threshold)

Initializes a new instance of the FastCornersDetector class.

Parameters:

threshold - Threshold.

Fast9

public Fast9(int threshold,
             boolean suppress)

Initializes a new instance of the FastCornersDetector class.

Parameters:

threshold - Threshold.

suppress - Supress.

Method Detail

getThreshold

public int getThreshold()

Get Threshold. A number denoting how much brighter or darker the pixels surrounding the pixel in question should be in order to be considered a corner.

Returns:

Threshold.

setThreshold

public void setThreshold(int threshold)

Set Threshold. A number denoting how much brighter or darker the pixels surrounding the pixel in question should be in order to be considered a corner.

Parameters:

threshold - Threshold.

isSuppressed

public boolean isSuppressed()

Check if needs apply a non-maximum suppression algorithm on the results, to allow only maximal corners.

Returns:

If true, allow only maximal corners, otherwise false.

setSuppression

public void setSuppression(boolean suppress)

Set suppression if needs apply a non-maximum suppression algorithm on the results, to allow only maximal corners.

Parameters:

suppress - If true, allow only maximal corners, otherwise false.

ProcessImage

public java.util.List<FeaturePoint> ProcessImage(FastBitmap fastBitmap)

Description copied from interface: ICornersFeatureDetector

Process image.

Specified by:

ProcessImage in interface ICornersFeatureDetector

Parameters:

fastBitmap - Image to be processed

Returns:

List of feature points.