net.sf.jaer.eventprocessing.label
Class NearestEventMotionComputer

java.lang.Object
  net.sf.jaer.eventprocessing.EventFilter
      net.sf.jaer.eventprocessing.EventFilter2D
          net.sf.jaer.eventprocessing.label.NearestEventMotionComputer

All Implemented Interfaces:

java.util.Observer, FrameAnnotater

public class NearestEventMotionComputer
extends EventFilter2D
implements java.util.Observer, FrameAnnotater

Computes motion based nearest event (in past time) in nearest neighboring pixels. Unlike DirectionSelectiveFilter, NearestEventMotionComputer uses the nonoriented events and is only useful for small particles where nearest neighbor makes sense. Even then for particles that are larger than one pixel it will make lots of errors.

Author:

tobi

Field Summary

protected int	maxDtThreshold event must occur within this time in us to generate a motion event
protected int	minDtThreshold
int	NUM_TYPES the number of cell output types

Fields inherited from class net.sf.jaer.eventprocessing.EventFilter2D

enclosedFilter, out

Fields inherited from class net.sf.jaer.eventprocessing.EventFilter

annotationEnabled, chip, enclosedFilterChain, filterEnabled, log, perf, propertyTooltipMap, support

Constructor Summary

NearestEventMotionComputer(AEChip chip)
Creates a new instance of NearestEventMotionComputer

Method Summary

void	annotate(float[][][] frame) annotate the RGB frame somehow by color pixels in the rendered pixel frame data.
void	annotate(javax.media.opengl.GLAutoDrawable drawable) Each annotator enters annotate with graphics context current, in coordinates with pixel 0,0 in LL corner (note opposite from Java2D) and pixel spacing 1 unit after the scaling transform (which is already active).
void	annotate(java.awt.Graphics2D g) each annotator is called by the relevant class (e.g.
EventPacket	filterPacket(EventPacket in) filters in to out.
static java.lang.String	getDescription()
java.lang.Object	getFilterState() should return the filter state in some useful form
int	getMaxDtThreshold()
int	getMinDtThreshold()
void	initFilter() this should allocate and initialize memory: it may be called when the chip e.g.
boolean	isGeneratingFilter()
void	resetFilter() should reset the filter to initial state
protected void	resetOut() Resets the output packet to be a new packet if none has been instanced or clears the packet if it exists
void	setMaxDtThreshold(int maxDtThreshold)
void	setMinDtThreshold(int minDtThreshold)
void	update(java.util.Observable o, java.lang.Object arg)

Methods inherited from class net.sf.jaer.eventprocessing.EventFilter2D

checkOutputPacketEventType, checkOutputPacketEventType, getEnclosedFilter, setEnclosedFilter, setFilterEnabled

Methods inherited from class net.sf.jaer.eventprocessing.EventFilter

getChip, getEnclosedFilterChain, getEnclosingFilter, getPrefs, getPropertyChangeSupport, getPropertyTooltip, isAnnotationEnabled, isEnclosed, isFilterEnabled, prefsEnabledKey, setAnnotationEnabled, setChip, setEnclosed, setEnclosedFilter, setEnclosedFilterChain, setEnclosingFilter, setPreferredEnabledState, setPrefs, setPropertyTooltip

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.jaer.graphics.FrameAnnotater

isAnnotationEnabled, setAnnotationEnabled

Field Detail

maxDtThreshold

protected int maxDtThreshold

event must occur within this time in us to generate a motion event

minDtThreshold

protected int minDtThreshold

NUM_TYPES

public final int NUM_TYPES

the number of cell output types

See Also:

Constant Field Values

Constructor Detail

NearestEventMotionComputer

public NearestEventMotionComputer(AEChip chip)

Creates a new instance of NearestEventMotionComputer

Method Detail

getDescription

public static java.lang.String getDescription()

isGeneratingFilter

public boolean isGeneratingFilter()

getFilterState

public java.lang.Object getFilterState()

Description copied from class: EventFilter

should return the filter state in some useful form

Specified by:

getFilterState in class EventFilter

resetFilter

public void resetFilter()

Description copied from class: EventFilter

should reset the filter to initial state

Specified by:

resetFilter in class EventFilter

getMaxDtThreshold

public int getMaxDtThreshold()

setMaxDtThreshold

public void setMaxDtThreshold(int maxDtThreshold)

getMinDtThreshold

public int getMinDtThreshold()

setMinDtThreshold

public void setMinDtThreshold(int minDtThreshold)

initFilter

public void initFilter()

Description copied from class: EventFilter

this should allocate and initialize memory: it may be called when the chip e.g. size parameters are changed after creation of the filter

Specified by:

initFilter in class EventFilter

update

public void update(java.util.Observable o,
                   java.lang.Object arg)

Specified by:

update in interface java.util.Observer

annotate

public void annotate(float[][][] frame)

Description copied from interface: FrameAnnotater

annotate the RGB frame somehow by color pixels in the rendered pixel frame data.

Specified by:

annotate in interface FrameAnnotater

Parameters:

frame - the RGB pixel information. First dimension is Y, second is X, third is RGB

annotate

public void annotate(java.awt.Graphics2D g)

Description copied from interface: FrameAnnotater

each annotator is called by the relevant class (e.g. EyeTracker) and enters annotate with graphics context current, in coordinates with pixel 0,0 in UL corner and pixel spacing 1 unit before scaling transform (which is already active).

Specified by:

annotate in interface FrameAnnotater

Parameters:

g - the Graphics2D context

annotate

public void annotate(javax.media.opengl.GLAutoDrawable drawable)

Description copied from interface: FrameAnnotater

Each annotator enters annotate with graphics context current, in coordinates with pixel 0,0 in LL corner (note opposite from Java2D) and pixel spacing 1 unit after the scaling transform (which is already active). The FrameAnnotater then can use JOGL calls to render to the screen by getting the GL context, e.g. the following code, used in the context of an AEChip object, draws a golden lines from LL to UR of the pixel array.

        GL gl = drawable.getGL();
        gl.glBegin(GL.GL_LINES);
        gl.glColor3f(.5f, .5f, 0);
        gl.glVertex2f(0, 0);
        gl.glVertex2f(getSizeX() - 1, getSizeY() - 1);
        gl.glEnd();
 

Specified by:

annotate in interface FrameAnnotater

Parameters:

drawable - the OpenGL drawable components, e.g., GLCanvas

resetOut

protected void resetOut()

Description copied from class: EventFilter2D

Resets the output packet to be a new packet if none has been instanced or clears the packet if it exists

Overrides:

resetOut in class EventFilter2D

filterPacket

public EventPacket filterPacket(EventPacket in)

filters in to out. if filtering is enabled, the number of out may be less than the number put in

Specified by:

filterPacket in class EventFilter2D

Parameters:

in - input events can be null or empty.

Returns:

the processed events, may be fewer in number.