JeVoisBase  1.20
JeVois Smart Embedded Machine Vision Toolkit Base Modules
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Public Member Functions | Related Functions | List of all members
DenseSift Class Reference
JeVoisBase machine vision modules

Simple demo of dense SIFT feature descriptors extraction. More...

Inheritance diagram for DenseSift:
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Collaboration diagram for DenseSift:
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Public Member Functions

virtual ~DenseSift ()
 Virtual destructor for safe inheritance. More...
 
virtual void process (jevois::InputFrame &&inframe, jevois::OutputFrame &&outframe) override
 Processing function. More...
 
- Public Member Functions inherited from jevois::Module
 Module (std::string const &instance)
 
virtual ~Module ()
 
virtual void process (InputFrame &&inframe)
 
virtual void process (InputFrame &&inframe, GUIhelper &helper)
 
virtual void sendSerial (std::string const &str)
 
virtual void parseSerial (std::string const &str, std::shared_ptr< UserInterface > s)
 
virtual void supportedCommands (std::ostream &os)
 
- Public Member Functions inherited from jevois::Component
 Component (std::string const &instance)
 
virtual ~Component ()
 
std::shared_ptr< Comp > addSubComponent (std::string const &instance, Args &&...args)
 
void removeSubComponent (std::shared_ptr< Comp > &component)
 
void removeSubComponent (std::string const &instance, bool warnIfNotFound=true)
 
std::shared_ptr< Comp > getSubComponent (std::string const &instance) const
 
bool isTopLevel () const
 
Engine * engine () const
 
bool initialized () const
 
const std::string & className () const
 
const std::string & instanceName () const
 
std::vector< std::string > setParamVal (std::string const &paramdescriptor, T const &val)
 
void setParamValUnique (std::string const &paramdescriptor, T const &val)
 
std::vector< std::pair< std::string, T > > getParamVal (std::string const &paramdescriptor) const
 
T getParamValUnique (std::string const &paramdescriptor) const
 
std::vector< std::string > setParamString (std::string const &paramdescriptor, std::string const &val)
 
void setParamStringUnique (std::string const &paramdescriptor, std::string const &val)
 
std::vector< std::pair< std::string, std::string > > getParamString (std::string const &paramdescriptor) const
 
std::string getParamStringUnique (std::string const &paramdescriptor) const
 
void freezeParam (std::string const &paramdescriptor)
 
void unFreezeParam (std::string const &paramdescriptor)
 
void freezeAllParams ()
 
void unFreezeAllParams ()
 
std::string descriptor () const
 
void setParamsFromFile (std::string const &filename)
 
std::istream & setParamsFromStream (std::istream &is, std::string const &absfile)
 
virtual void paramInfo (std::shared_ptr< UserInterface > s, std::map< std::string, std::string > &categs, bool skipFrozen, std::string const &cname="", std::string const &pfx="")
 
void foreachParam (std::function< void(std::string const &compname, ParameterBase *p)> func, std::string const &cname="")
 
std::shared_ptr< DynamicParameter< T > > addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ParameterCategory const &category)
 
std::shared_ptr< DynamicParameter< T > > addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ValidValuesSpec< T > const &validValuesSpec, ParameterCategory const &category)
 
void setDynamicParameterCallback (std::string const &name, std::function< void(T const &)> cb, bool callnow=true)
 
void removeDynamicParameter (std::string const &name)
 
void setPath (std::string const &path)
 
std::filesystem::path absolutePath (std::filesystem::path const &path="")
 
std::shared_ptr< Comp > addSubComponent (std::string const &instance, Args &&...args)
 
void removeSubComponent (std::shared_ptr< Comp > &component)
 
void removeSubComponent (std::string const &instance, bool warnIfNotFound=true)
 
std::shared_ptr< Comp > getSubComponent (std::string const &instance) const
 
bool isTopLevel () const
 
Engine * engine () const
 
bool initialized () const
 
const std::string & className () const
 
const std::string & instanceName () const
 
std::vector< std::string > setParamVal (std::string const &paramdescriptor, T const &val)
 
void setParamValUnique (std::string const &paramdescriptor, T const &val)
 
std::vector< std::pair< std::string, T > > getParamVal (std::string const &paramdescriptor) const
 
T getParamValUnique (std::string const &paramdescriptor) const
 
std::vector< std::string > setParamString (std::string const &paramdescriptor, std::string const &val)
 
void setParamStringUnique (std::string const &paramdescriptor, std::string const &val)
 
std::vector< std::pair< std::string, std::string > > getParamString (std::string const &paramdescriptor) const
 
std::string getParamStringUnique (std::string const &paramdescriptor) const
 
void freezeParam (std::string const &paramdescriptor)
 
void unFreezeParam (std::string const &paramdescriptor)
 
void freezeAllParams ()
 
void unFreezeAllParams ()
 
std::string descriptor () const
 
void setParamsFromFile (std::string const &filename)
 
std::istream & setParamsFromStream (std::istream &is, std::string const &absfile)
 
virtual void paramInfo (std::shared_ptr< UserInterface > s, std::map< std::string, std::string > &categs, bool skipFrozen, std::string const &cname="", std::string const &pfx="")
 
void foreachParam (std::function< void(std::string const &compname, ParameterBase *p)> func, std::string const &cname="")
 
std::shared_ptr< DynamicParameter< T > > addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ParameterCategory const &category)
 
std::shared_ptr< DynamicParameter< T > > addDynamicParameter (std::string const &name, std::string const &description, T const &defaultValue, ValidValuesSpec< T > const &validValuesSpec, ParameterCategory const &category)
 
void setDynamicParameterCallback (std::string const &name, std::function< void(T const &)> cb, bool callnow=true)
 
void removeDynamicParameter (std::string const &name)
 
void setPath (std::string const &path)
 
std::filesystem::path absolutePath (std::filesystem::path const &path="")
 
- Public Member Functions inherited from jevois::ParameterRegistry
virtual ~ParameterRegistry ()
 

Related Functions

(Note that these are not member functions.)

 JEVOIS_DECLARE_PARAMETER (step, unsigned int, "Keypoint step (pixels)", 11, ParamCateg)
 Parameter. More...
 
 JEVOIS_DECLARE_PARAMETER (binsize, unsigned int, "Descriptor bin size", 8, ParamCateg)
 Parameter. More...
 

Additional Inherited Members

- Protected Member Functions inherited from jevois::Component
virtual void preInit ()
 
virtual void postInit ()
 
virtual void preUninit ()
 
virtual void postUninit ()
 
virtual void preInit ()
 
virtual void postInit ()
 
virtual void preUninit ()
 
virtual void postUninit ()
 
- Protected Member Functions inherited from jevois::ParameterRegistry
void addParameter (ParameterBase *const param)
 
void removeParameter (ParameterBase *const param)
 
void callbackInitCall ()
 

Detailed Description

Simple demo of dense SIFT feature descriptors extraction.

Compute SIFT keypoint descriptors on a regular grid over the input image.

This module is useful when using JeVois as a pre-processor, delivering a dense array of keypoint descriptors to a host computer, where the array is disguised as a grayscale video frame. Upon receiving the array of descriptors, the host computer can further process them. For example, the host computer may compute camera motion in space by matching descriptors across successive frames, or may attempt to detect and identify objects based on the descriptors.

Beware that changing the values for the step and binsize parameters changes the output image size, so you need to adjust your video mappings accordingly. Hence, setting those parameters is best done once and for all in the module's optional params.cfg or script.cfg file.

This module can either have a color YUYV output, which shows the original camera image, keypoint locations, and descriptor values; or a greyscale output, which is just the descriptor values.

This algorithm is implemented using the VLfeat library. It is quite slow, maybe because this library is a bit old and appears to be single-threaded.

Author
Laurent Itti
Display Name:
Dense SIFT
Videomapping:
YUYV 288 120 5.0 YUYV 160 120 5.0 JeVois DenseSift
Videomapping:
GREY 128 117 5.0 YUYV 160 120 5.0 JeVois DenseSift
Email:
itti@usc.edu
Address:
University of Southern California, HNB-07A, 3641 Watt Way, Los Angeles, CA 90089-2520, USA
Copyright
Copyright (C) 2016 by Laurent Itti, iLab and the University of Southern California
Main URL:
http://jevois.org
Support URL:
http://jevois.org/doc
Other URL:
http://iLab.usc.edu
License:
GPL v3
Distribution:
Unrestricted
Restrictions:
None

Definition at line 76 of file DenseSift.C.

Constructor & Destructor Documentation

◆ ~DenseSift()

virtual DenseSift::~DenseSift ( )
inlinevirtual

Virtual destructor for safe inheritance.

Definition at line 84 of file DenseSift.C.

Member Function Documentation

◆ process()

virtual void DenseSift::process ( jevois::InputFrame &&  inframe,
jevois::OutputFrame &&  outframe 
)
inlineoverridevirtual

Processing function.

Reimplemented from jevois::Module.

Definition at line 87 of file DenseSift.C.

References jevois::async(), jevois::RawImage::buf, jevois::rawimage::convertToCvGray(), jevois::rawimage::drawDisk(), jevois::RawImage::fmt, h, jevois::RawImage::height, demo::int, jevois::rawimage::pasteGreyToYUYV(), jevois::RawImage::require(), jevois::Timer::start(), jevois::Timer::stop(), demo::w, jevois::warnAndIgnoreException(), jevois::RawImage::width, and jevois::rawimage::writeText().

Friends And Related Function Documentation

◆ JEVOIS_DECLARE_PARAMETER() [1/2]

JEVOIS_DECLARE_PARAMETER ( binsize  ,
unsigned int  ,
"Descriptor bin size"  ,
8  ,
ParamCateg   
)
related

Parameter.

◆ JEVOIS_DECLARE_PARAMETER() [2/2]

JEVOIS_DECLARE_PARAMETER ( step  ,
unsigned int  ,
"Keypoint step (pixels)"  ,
11  ,
ParamCateg   
)
related

Parameter.

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