Package boofcv.alg.feature.detect.extract

Class NonMaxBlock

java.lang.Object

boofcv.alg.feature.detect.extract.NonMaxBlock

Direct Known Subclasses:

NonMaxBlock_MT

public class NonMaxBlock
extends Object

Non-maximum extractor based on the block algorithm in [1]. The worst case complexity per pixel is 4 - 4/(n+1) where n is the region size. The algorithm works by breaking up the image into a set of evenly spaced blocks with their sides touching. The local maximum is found inside a block and then the region around that maximum is examined to see if it is truly a local max.

Each block check is independent of all the others and no information is exchanged. This algorithm could be paralyzed easily and has no memory overhead.

See NonMaxSuppression for a definition of parameters not described in this document

[1] Neubeck, A. and Van Gool, L. "Efficient non-maximum suppression" ICPR 2006

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	NonMaxBlock.Search

Field Summary

Fields

Modifier and Type	Field	Description
protected int	border
protected boofcv.alg.feature.detect.extract.NonMaxBlock.Configuration	configuration
protected NonMaxBlock.Search	search

Constructor Summary

Constructors

Constructor	Description
NonMaxBlock(NonMaxBlock.Search search)

Method Summary

Modifier and Type	Method	Description
int	getBorder()
NonMaxBlock.Search	getSearch()
int	getSearchRadius()
float	getThresholdMax()
float	getThresholdMin()
void	process(GrayF32 intensityImage, @Nullable QueueCorner localMin, @Nullable QueueCorner localMax)	Detects local minimums and/or maximums in the provided intensity image.
void	setBorder(int border)
void	setSearchRadius(int radius)
void	setThresholdMax(float thresholdMax)
void	setThresholdMin(float thresholdMin)

Methods inherited from class java.lang.Object

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

Field Details

configuration

protected final boofcv.alg.feature.detect.extract.NonMaxBlock.Configuration configuration

border

protected int border

search

protected NonMaxBlock.Search search

Constructor Details

NonMaxBlock

public NonMaxBlock(NonMaxBlock.Search search)

Method Details

process

public void process(GrayF32 intensityImage,
@Nullable
@Nullable QueueCorner localMin,
@Nullable
@Nullable QueueCorner localMax)

Detects local minimums and/or maximums in the provided intensity image.

Parameters:

intensityImage - (Input) Feature intensity image.

localMin - (Output) storage for found local minimums.

localMax - (Output) storage for found local maximums.

getSearch

public NonMaxBlock.Search getSearch()

setSearchRadius

public void setSearchRadius(int radius)

getBorder

public int getBorder()

setBorder

public void setBorder(int border)

getSearchRadius

public int getSearchRadius()

getThresholdMin

public float getThresholdMin()

setThresholdMin

public void setThresholdMin(float thresholdMin)

getThresholdMax

public float getThresholdMax()

setThresholdMax

public void setThresholdMax(float thresholdMax)