Detailed Description

Track a set of features from old_img -> new_img using sparse optimal flow (classic KL method).

See CGenericFeatureTracker for a more detailed explanation on how to use this class.

List of additional parameters in "extra_params" (apart from those in CGenericFeatureTracker) accepted by this class:

"window_width" (Default=15)
"window_height" (Default=15)
"LK_levels" (Default=3) Number of pyramids to build for LK tracking (this parameter only has effects when tracking with CImage's, not with CImagePyramid's).
"LK_max_iters" (Default=10) Max. number of iterations in LK tracking.
"LK_epsilon" (Default=0.1) Minimum epsilon step in interations of LK_tracking.
"LK_max_tracking_error" (Default=150.0) The maximum "tracking error" of LK tracking such as a feature is marked as "lost".

See also: OpenCV's method cvCalcOpticalFlowPyrLK

Definition at line 282 of file tracking.h.

#include <mrpt/vision/tracking.h>

Inheritance diagram for mrpt::vision::CFeatureTracker_KL:

Public Member Functions
	CFeatureTracker_KL ()=default
	Default ctor. More...

	CFeatureTracker_KL (mrpt::system::TParametersDouble extraParams)
	Ctor with extra parameters. More...

void	trackFeatures (const mrpt::img::CImage &old_img, const mrpt::img::CImage &new_img, TKeyPointList &inout_featureList)
	Perform feature tracking from "old_img" to "new_img", with a (possibly empty) list of previously tracked features "inout_featureList". More...

void	trackFeatures (const mrpt::img::CImage &old_img, const mrpt::img::CImage &new_img, TKeyPointfList &inout_featureList)
	overload with subpixel precision More...

const mrpt::system::CTimeLogger &	getProfiler () const
	Returns a read-only reference to the internal time logger. More...

mrpt::system::CTimeLogger &	getProfiler ()
	Returns a reference to the internal time logger. More...

void	enableTimeLogger (bool enable=true)
	Returns a read-only reference to the internal time logger. More...

int	getDetectorAdaptiveThreshold () const
	Returns the current adaptive threshold used by the FAST(ER) detector to find out new features in empty areas. More...

Public Attributes
mrpt::system::TParametersDouble	extra_params
	Optional list of extra parameters to the algorithm. More...

TExtraOutputInfo	last_execution_extra_info
	Updated with each call to trackFeatures() More...

Protected Member Functions
void	trackFeatures_impl (const mrpt::img::CImage &old_img, const mrpt::img::CImage &new_img, TKeyPointList &inout_featureList) override
	The tracking method implementation, to be implemented in children classes. More...

void	trackFeatures_impl (const mrpt::img::CImage &old_img, const mrpt::img::CImage &new_img, TKeyPointfList &inout_featureList) override
	The tracking method implementation, to be implemented in children classes. More...

void	updateAdaptiveNewFeatsThreshold (const size_t nNewlyDetectedFeats, const size_t desired_num_features)
	Adapts the threshold m_detector_adaptive_thres according to the real and desired number of features just detected. More...

Protected Attributes
mrpt::system::CTimeLogger	m_timlog
	the internal time logger, disabled by default. More...

mrpt::vision::TKeyPointList	m_newly_detected_feats
	This field is clared by trackFeatures() before calling trackFeatures_impl(), and can be filled out with newly defected FAST(ER) features in the latter. More...

Private Member Functions
template<typename FEATLIST >
void	trackFeatures_impl_templ (const mrpt::img::CImage &old_img, const mrpt::img::CImage &new_img, FEATLIST &inout_featureList)
	Track a set of features from old_img -> new_img using sparse optimal flow (classic KL method) Optional parameters that can be passed in "extra_params": More...

Constructor & Destructor Documentation

◆ CFeatureTracker_KL() [1/2]

mrpt::vision::CFeatureTracker_KL::CFeatureTracker_KL ( )

inlinedefault

Default ctor.

◆ CFeatureTracker_KL() [2/2]

mrpt::vision::CFeatureTracker_KL::CFeatureTracker_KL ( mrpt::system::TParametersDouble extraParams )

inline

Ctor with extra parameters.

Definition at line 287 of file tracking.h.

Member Function Documentation

◆ enableTimeLogger()

void mrpt::vision::CGenericFeatureTracker::enableTimeLogger ( bool enable = true )

inlineinherited

Returns a read-only reference to the internal time logger.

Definition at line 190 of file tracking.h.

References mrpt::system::CTimeLogger::enable(), and mrpt::vision::CGenericFeatureTracker::m_timlog.

Here is the call graph for this function:

◆ getDetectorAdaptiveThreshold()

int mrpt::vision::CGenericFeatureTracker::getDetectorAdaptiveThreshold ( ) const

inlineinherited

Returns the current adaptive threshold used by the FAST(ER) detector to find out new features in empty areas.

Definition at line 197 of file tracking.h.

References mrpt::vision::CGenericFeatureTracker::m_detector_adaptive_thres.

◆ getProfiler() [1/2]

const mrpt::system::CTimeLogger& mrpt::vision::CGenericFeatureTracker::getProfiler ( ) const

inlineinherited

Returns a read-only reference to the internal time logger.

Definition at line 183 of file tracking.h.

References mrpt::vision::CGenericFeatureTracker::m_timlog.

◆ getProfiler() [2/2]

mrpt::system::CTimeLogger& mrpt::vision::CGenericFeatureTracker::getProfiler ( )

inlineinherited

Returns a reference to the internal time logger.

Definition at line 188 of file tracking.h.

References mrpt::vision::CGenericFeatureTracker::m_timlog.

◆ trackFeatures() [1/2]

void CGenericFeatureTracker::trackFeatures	(	const mrpt::img::CImage &	old_img,
		const mrpt::img::CImage &	new_img,
		TKeyPointList &	inout_featureList
	)

inherited

Perform feature tracking from "old_img" to "new_img", with a (possibly empty) list of previously tracked features "inout_featureList".

This is a list of parameters (in "extraParams") accepted by ALL implementations of feature tracker (see each derived class for more specific parameters).

"add_new_features" (Default=0). If set to "1", new features will be also added to the existing ones in areas of the image poor of features. This method does:

Convert old and new images to grayscale, if they're in color.

Call the pure virtual "trackFeatures_impl" method.
Implement the optional detection of new features if "add_new_features"!=0.

Definition at line 662 of file tracking.cpp.

◆ trackFeatures() [2/2]

void CGenericFeatureTracker::trackFeatures	(	const mrpt::img::CImage &	old_img,
		const mrpt::img::CImage &	new_img,
		TKeyPointfList &	inout_featureList
	)

inherited

overload with subpixel precision

Definition at line 668 of file tracking.cpp.

◆ trackFeatures_impl() [1/2]

void CFeatureTracker_KL::trackFeatures_impl	(	const mrpt::img::CImage &	old_img,
		const mrpt::img::CImage &	new_img,
		TKeyPointList &	inout_featureList
	)

overrideprotectedvirtual

The tracking method implementation, to be implemented in children classes.

Implements mrpt::vision::CGenericFeatureTracker.

Definition at line 124 of file tracking_KL.cpp.

◆ trackFeatures_impl() [2/2]

void CFeatureTracker_KL::trackFeatures_impl	(	const mrpt::img::CImage &	old_img,
		const mrpt::img::CImage &	new_img,
		TKeyPointfList &	inout_featureList
	)

overrideprotectedvirtual

The tracking method implementation, to be implemented in children classes.

Reimplemented from mrpt::vision::CGenericFeatureTracker.

Definition at line 130 of file tracking_KL.cpp.

◆ trackFeatures_impl_templ()

template<typename FEATLIST >

void CFeatureTracker_KL::trackFeatures_impl_templ	(	const mrpt::img::CImage &	old_img,
		const mrpt::img::CImage &	new_img,
		FEATLIST &	featureList
	)

private

Track a set of features from old_img -> new_img using sparse optimal flow (classic KL method) Optional parameters that can be passed in "extra_params":

"window_width" (Default=15)
"window_height" (Default=15)

See also: OpenCV's method cvCalcOpticalFlowPyrLK

Definition at line 37 of file tracking_KL.cpp.

References mrpt::img::CImage::asCvMatRef(), ASSERT_, mrpt::img::FAST_REF_OR_CONVERT_TO_GRAY, mrpt::img::CImage::getHeight(), mrpt::img::CImage::getWidth(), MRPT_END, MRPT_START, status, mrpt::vision::status_LOST, mrpt::vision::status_OOB, mrpt::vision::status_TRACKED, and THROW_EXCEPTION.

Here is the call graph for this function:

◆ updateAdaptiveNewFeatsThreshold()

void CGenericFeatureTracker::updateAdaptiveNewFeatsThreshold	(	const size_t	nNewlyDetectedFeats,
		const size_t	desired_num_features
	)

protectedinherited

Adapts the threshold m_detector_adaptive_thres according to the real and desired number of features just detected.

Definition at line 674 of file tracking.cpp.

References min.

Member Data Documentation

◆ extra_params

mrpt::system::TParametersDouble mrpt::vision::CGenericFeatureTracker::extra_params

inherited

Optional list of extra parameters to the algorithm.

Definition at line 144 of file tracking.h.

◆ last_execution_extra_info

TExtraOutputInfo mrpt::vision::CGenericFeatureTracker::last_execution_extra_info

inherited

Updated with each call to trackFeatures()

Definition at line 212 of file tracking.h.

◆ m_newly_detected_feats

mrpt::vision::TKeyPointList mrpt::vision::CGenericFeatureTracker::m_newly_detected_feats

protectedinherited

This field is clared by trackFeatures() before calling trackFeatures_impl(), and can be filled out with newly defected FAST(ER) features in the latter.

If it's not the case, feats will be computed anyway if the user enabled the "add_new_features" option.

Definition at line 236 of file tracking.h.

◆ m_timlog

mrpt::system::CTimeLogger mrpt::vision::CGenericFeatureTracker::m_timlog

protectedinherited

the internal time logger, disabled by default.

Definition at line 228 of file tracking.h.

Referenced by mrpt::vision::CGenericFeatureTracker::enableTimeLogger(), and mrpt::vision::CGenericFeatureTracker::getProfiler().

Detailed Description

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Private Member Functions

Constructor & Destructor Documentation

◆ CFeatureTracker_KL() [1/2]

◆ CFeatureTracker_KL() [2/2]

Member Function Documentation

◆ enableTimeLogger()

◆ getDetectorAdaptiveThreshold()

◆ getProfiler() [1/2]

◆ getProfiler() [2/2]

◆ trackFeatures() [1/2]

◆ trackFeatures() [2/2]

◆ trackFeatures_impl() [1/2]

◆ trackFeatures_impl() [2/2]

◆ trackFeatures_impl_templ()

◆ updateAdaptiveNewFeatsThreshold()

Member Data Documentation

◆ extra_params

◆ last_execution_extra_info

◆ m_newly_detected_feats

◆ m_timlog