ev::Mat::Time Class Reference

Spatial map storing the timestamp of the most recent event at each pixel. More...

#include <matrices.hpp>

Inheritance diagram for ev::Mat::Time:

Public Member Functions
template<typename T>
TimeType	insert (const Event_< T > &e)
	Insert an event, storing e.t at pixel (e.x, e.y).
template<typename T>
TimeType	emplace (const T x, const T y, const TimeType t)
	Store timestamp t at (x, y) without constructing an Event_.
Public Member Functions inherited from ev::Mat::Mat_< TimeType >
void	updateStats (const Event &e)
	Account for an event in the statistics reported by count() and duration().
std::size_t	count () const
	Number of events accounted for by updateStats().
TimeType	firstTimestamp () const
	Timestamp of the first event accounted for by updateStats().
TimeType	lastTimestamp () const
	Timestamp of the last event accounted for by updateStats().
void	resetStats ()
	Reset statistics.
void	clear ()
	Reset all pixels.
Public Member Functions inherited from ev::Stats_< Mat_< TimeType > >
ResultType	duration () const
	Time difference between the last and the first event.
ResultType	rate () const
	Compute event rate as the ratio between the number of events and the time difference between the last and the first event.
ResultType	density (const cv::Size size) const
	Compute event density as the ratio between the number of events and the number of pixels.
std::size_t	activePixels () const
	Count the pixels with at least one event.
ResultType	fillRatio (const cv::Size size) const
	Compute fill ratio as the fraction of pixels with at least one event.
ResultType	polarityRatio (const PolarityType p) const
	Compute polarity ratio as the fraction of events with the given polarity.
Event_< ResultType >	mean () const
	Compute the mean of the events.
cv::Point_< ResultType >	meanPoint () const
	Compute the mean x,y point of the events.
cv::Matx< ResultType, 2, 2 >	covariance () const
	Compute the covariance of the x,y coordinates of the events around meanPoint().
cv::Rect	boundingBox () const
	Compute the smallest rectangle of pixels containing the events.
ResultType	meanTime () const
	Compute the mean time of the events.
ResultType	midTime () const
	Calculate the midpoint time between the oldest and the newest event.
std::size_t	peak () const
	Find the largest number of events on a single pixel.
ResultType	entropy () const
	Compute the Shannon entropy of the spatial distribution of the events.

Friends
std::ostream &	operator<< (std::ostream &os, const Time &time)

Additional Inherited Members
Public Types inherited from ev::Stats_< Mat_< TimeType > >
using	ResultType

Detailed Description

Spatial map storing the timestamp of the most recent event at each pixel.

Each insertion overwrites the stored timestamp unconditionally; only the latest timestamp per pixel is retained. Timestamps are stored as TimeType.

Member Function Documentation

emplace()

template<typename T>

TimeType ev::Mat::Time::emplace ( const T x, const T y, const TimeType t )

inline

Store timestamp t at (x, y) without constructing an Event_.

Parameters

x	Spatial coordinate x
y	Spatial coordinate y
t	Timestamp

Returns

Stored timestamp

insert()

template<typename T>

TimeType ev::Mat::Time::insert ( const Event_< T > & e )

inline

Insert an event, storing e.t at pixel (e.x, e.y).

Parameters

e	Event to insert

Returns

Stored timestamp

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The documentation for this class was generated from the following file:

• modules/core/include/openev/core/matrices.hpp