Simple demo of QR-code and barcode detection and decoding using the ZBar library. More...

Inheritance diagram for DemoQRcode:

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Collaboration diagram for DemoQRcode:

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Public Member Functions
	DemoQRcode (std::string const &instance)
	Constructor.

virtual	~DemoQRcode ()
	Virtual destructor for safe inheritance.

virtual void	process (jevois::InputFrame &&inframe) override
	Processing function, no video output.

virtual void	process (jevois::InputFrame &&inframe, jevois::OutputFrame &&outframe) override
	Processing function with video output to USB.

virtual void	process (jevois::InputFrame &&inframe, jevois::GUIhelper &helper) override
	Processing function with JeVois-Pro GUI.

Public Member Functions inherited from jevois::StdModule
	StdModule (std::string const &instance)

virtual	~StdModule ()

void	sendSerialImg1Dx (unsigned int camw, float x, float size=0.0F, std::string const &id="", std::string const &extra="")

void	sendSerialStd1Dx (float x, float size=0.0F, std::string const &id="", std::string const &extra="")

void	sendSerialImg1Dy (unsigned int camh, float y, float size=0.0F, std::string const &id="", std::string const &extra="")

void	sendSerialStd1Dy (float y, float size=0.0F, std::string const &id="", std::string const &extra="")

void	sendSerialImg2D (unsigned int camw, unsigned int camh, float x, float y, float w=0.0F, float h=0.0F, std::string const &id="", std::string const &extra="")

void	sendSerialStd2D (float x, float y, float w=0.0F, float h=0.0F, std::string const &id="", std::string const &extra="")

void	sendSerialContour2D (unsigned int camw, unsigned int camh, std::vector< cv::Point_< T > > points, std::string const &id="", std::string const &extra="")

void	sendSerialStd3D (float x, float y, float z, float w=0.0F, float h=0.0F, float d=0.0F, float q1=0.0F, float q2=0.0F, float q3=0.0f, float q4=0.0F, std::string const &id="", std::string const &extra="")

void	sendSerialStd3D (std::vector< cv::Point3f > points, std::string const &id="", std::string const &extra="")

void	sendSerialObjReco (std::vector< ObjReco > const &res)

void	sendSerialObjDetImg2D (unsigned int camw, unsigned int camh, float x, float y, float w, float h, std::vector< ObjReco > const &res)

void	sendSerialObjDetImg2D (unsigned int camw, unsigned int camh, ObjDetect const &det)

void	sendSerialObjDetImg2D (unsigned int camw, unsigned int camh, ObjDetectOBB const &det)

	JEVOIS_DEFINE_ENUM_CLASS (SerStyle,(Terse)(Normal)(Detail)(Fine))

	JEVOIS_DECLARE_PARAMETER (serstyle, SerStyle, "Style for standardized serial messages as defined in " "http://jevois.org/doc/UserSerialStyle.html", SerStyle::Terse, SerStyle_Values, ParamCateg)

	JEVOIS_DECLARE_PARAMETER (serprec, unsigned int, "Number of decimal points in standardized serial messages as " "defined in http://jevois.org/doc/UserSerialStyle.html", 0U, jevois::Range< unsigned int >(0U, 10U), ParamCateg)

	JEVOIS_DEFINE_ENUM_CLASS (SerStamp,(None)(Frame)(Time)(FrameTime)(FrameDateTime))

	JEVOIS_DECLARE_PARAMETER (serstamp, SerStamp, "Prepend standardized serial messages with a frame number, " "time, frame+time, or frame+date+time. See details in " "http://jevois.org/doc/UserSerialStyle.html", SerStamp::None, SerStamp_Values, ParamCateg)

	JEVOIS_DEFINE_ENUM_CLASS (SerMark,(None)(Start)(Stop)(Both))

	JEVOIS_DECLARE_PARAMETER (sermark, SerMark, "Send serial message to mark the beginning (MARK START) of the " "processing of a video frame from the camera sensor, the end (MARK STOP), or both. " "Useful, among others, if one needs to know when no results were sent over serial " "on a given frame. Combine with parameter serstamp if you need to know the frame number.", SerMark::None, SerMark_Values, ParamCateg)

Public Member Functions inherited from jevois::Module
	Module (std::string const &instance)

virtual	~Module ()

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

bool	initialized () const

std::string const &	className () const

std::string const &	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, bool doit)

void	freezeAllParams (bool doit)

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, bool throw_if_not_found=true)

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

bool	initialized () const

std::string const &	className () const

std::string const &	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, bool doit)

void	freezeAllParams (bool doit)

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, bool throw_if_not_found=true)

void	setPath (std::string const &path)

std::filesystem::path	absolutePath (std::filesystem::path const &path="")

Public Member Functions inherited from jevois::ParameterRegistry
virtual	~ParameterRegistry ()

Protected Attributes
std::shared_ptr< QRcode >	itsQRcode

Additional Inherited Members
Protected Member Functions inherited from jevois::StdModule
void	sendSerialMarkStart ()

void	sendSerialMarkStop ()

std::string	getStamp () const

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 QR-code and barcode detection and decoding using the ZBar library.

Detect barcodes and QR-codes, and decode their contents.

QR-codes (Quick Response Codes) are popular 2D patterns that contain embedded information, such as a string of text, a URL, etc. They basically work like barcodes, coding information into a high-contrast, geometric pattern that is easier to detect and decode by a machine that more conventional human-written text or drawings.

One can generate QR-codes containing different kinds of information, for example using online QR-code generators, such as http://www.qr-code-generator.com/

JeVois detects and decodes QR-codes and other barcodes. The implementation of the detection and decoding algorithm used in JeVois is from the popular library ZBar, found at http://zbar.sourceforge.net/

You should be able to sustain 30 frames/s with camera resolution 320x240, and 15 frames/s with camera resolution 640x480 when running this module inside the JeVois smart camera.

Serial Messages

This module can send standardized serial messages as described in Standardized serial messages formatting. One message is issued for every detected QR-code or barcode, on every video frame.

Serial message type: 2D
id: type of symbol (e.g., QR-Code, ISBN13, etc).
x, y, or vertices: standardized 2D coordinates of symbol center or of corners of bounding box (depending on serstyle)
w, h: standardized object size
extra: decoded contents (e.g., URL that was in a QR-code, ISBN number from a barcode, etc)

Note that when serstyle is Fine, only 4 corners are returned for each detected QR-code, but many points are returned all over each detected barcode. Beware to not exceed your serial bandwidth in that case.

See Standardized serial messages formatting for more on standardized serial messages, and Helper functions to convert coordinates from camera resolution to standardized for more info on standardized coordinates.

Author: Laurent Itti

Display Name:: Demo QR-code

Videomapping:: YUYV 640 526 15.0 YUYV 640 480 15.0 JeVois DemoQRcode

Videomapping:: YUYV 320 286 30.0 YUYV 320 240 30.0 JeVois DemoQRcode

Videomapping:: NONE 0 0 0 YUYV 640 480 15.0 JeVois DemoQRcode

Videomapping:: NONE 0 0 0 YUYV 320 240 30.0 JeVois DemoQRcode

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 79 of file DemoQRcode.C.

Constructor & Destructor Documentation

◆ DemoQRcode()

DemoQRcode::DemoQRcode ( std::string const & instance )

inline

Constructor.

Definition at line 86 of file DemoQRcode.C.

References itsQRcode.

◆ ~DemoQRcode()

virtual DemoQRcode::~DemoQRcode ( )

inlinevirtual

Virtual destructor for safe inheritance.

Definition at line 92 of file DemoQRcode.C.

Member Function Documentation

◆ process() [1/3]

virtual void DemoQRcode::process ( jevois::InputFrame && inframe )

inlineoverridevirtual

Processing function, no video output.

Reimplemented from jevois::Module.

Definition at line 98 of file DemoQRcode.C.

References jevois::rawimage::convertToCvGray(), h, jevois::RawImage::height, itsQRcode, and jevois::RawImage::width.

◆ process() [2/3]

virtual void DemoQRcode::process	(	jevois::InputFrame &&	inframe,
		jevois::GUIhelper &	helper
	)

inlineoverridevirtual

Processing function with JeVois-Pro GUI.

Reimplemented from jevois::Module.

Definition at line 181 of file DemoQRcode.C.

References jevois::rawimage::convertToCvGray(), jevois::GUIhelper::drawInputFrame(), jevois::GUIhelper::endFrame(), h, jevois::RawImage::height, jevois::GUIhelper::iinfo(), jevois::GUIhelper::itext(), itsQRcode, jevois::Timer::start(), jevois::GUIhelper::startFrame(), jevois::Timer::stop(), and jevois::RawImage::width.

◆ process() [3/3]

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

inlineoverridevirtual

Processing function with video output to USB.

Reimplemented from jevois::Module.

Definition at line 124 of file DemoQRcode.C.

References jevois::async(), jevois::rawimage::convertToCvGray(), jevois::rawimage::drawFilledRect(), jevois::RawImage::fmt, h, jevois::RawImage::height, itsQRcode, jevois::rawimage::paste(), jevois::RawImage::require(), jevois::Timer::start(), jevois::Timer::stop(), jevois::yuyv::White, jevois::RawImage::width, and jevois::rawimage::writeText().

Member Data Documentation

◆ itsQRcode

std::shared_ptr<QRcode> DemoQRcode::itsQRcode

protected

Definition at line 228 of file DemoQRcode.C.

Referenced by DemoQRcode(), process(), process(), and process().

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

src/Modules/DemoQRcode/DemoQRcode.C

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Serial Messages

Constructor & Destructor Documentation

◆ DemoQRcode()

◆ ~DemoQRcode()

Member Function Documentation

◆ process() [1/3]

◆ process() [2/3]

◆ process() [3/3]

Member Data Documentation

◆ itsQRcode