cv::QRCodeDetector Class Reference

QR code detector. More...

#include <opencv2/objdetect.hpp>

Collaboration diagram for cv::QRCodeDetector:

Public Member Functions
	QRCodeDetector ()
cv::String	decodeCurved (InputArray img, InputArray points, OutputArray straight_qrcode=noArray())
	Decodes QR code on a curved surface in image once it's found by the detect() method.
std::string	detectAndDecodeCurved (InputArray img, OutputArray points=noArray(), OutputArray straight_qrcode=noArray())
	Both detects and decodes QR code on a curved surface.
QRCodeDetector &	setEpsX (double epsX)
	sets the epsilon used during the horizontal scan of QR code stop marker detection.
QRCodeDetector &	setEpsY (double epsY)
	sets the epsilon used during the vertical scan of QR code stop marker detection.
QRCodeDetector &	setUseAlignmentMarkers (bool useAlignmentMarkers)
	use markers to improve the position of the corners of the QR code
Public Member Functions inherited from cv::GraphicalCodeDetector
	GraphicalCodeDetector ()
	GraphicalCodeDetector (const GraphicalCodeDetector &)=default
	GraphicalCodeDetector (GraphicalCodeDetector &&)=default
std::string	decode (InputArray img, InputArray points, OutputArray straight_code=noArray()) const
	Decodes graphical code in image once it's found by the detect() method.
bool	decodeMulti (InputArray img, InputArray points, std::vector< std::string > &decoded_info, OutputArrayOfArrays straight_code=noArray()) const
	Decodes graphical codes in image once it's found by the detect() method.
bool	detect (InputArray img, OutputArray points) const
	Detects graphical code in image and returns the quadrangle containing the code.
std::string	detectAndDecode (InputArray img, OutputArray points=noArray(), OutputArray straight_code=noArray()) const
	Both detects and decodes graphical code.
bool	detectAndDecodeMulti (InputArray img, std::vector< std::string > &decoded_info, OutputArray points=noArray(), OutputArrayOfArrays straight_code=noArray()) const
	Both detects and decodes graphical codes.
bool	detectMulti (InputArray img, OutputArray points) const
	Detects graphical codes in image and returns the vector of the quadrangles containing the codes.
GraphicalCodeDetector &	operator= (const GraphicalCodeDetector &)=default
GraphicalCodeDetector &	operator= (GraphicalCodeDetector &&)=default

Additional Inherited Members
Protected Attributes inherited from cv::GraphicalCodeDetector
Ptr< Impl >	p

Detailed Description

QR code detector.

Constructor & Destructor Documentation

QRCodeDetector()

cv::QRCodeDetector::QRCodeDetector

(

)

Python:
	cv.QRCodeDetector(		) ->	<QRCodeDetector object>

Member Function Documentation

decodeCurved()

cv::String cv::QRCodeDetector::decodeCurved	(	InputArray	img,
		InputArray	points,
		OutputArray	straight_qrcode = noArray()
	)

Python:
	cv.QRCodeDetector.decodeCurved(	img, points[, straight_qrcode]	) ->	retval, straight_qrcode

Decodes QR code on a curved surface in image once it's found by the detect() method.

Returns UTF8-encoded output string or empty string if the code cannot be decoded.

Parameters

img	grayscale or color (BGR) image containing QR code.
points	Quadrangle vertices found by detect() method (or some other algorithm).
straight_qrcode	The optional output image containing rectified and binarized QR code

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detectAndDecodeCurved()

std::string cv::QRCodeDetector::detectAndDecodeCurved	(	InputArray	img,
		OutputArray	points = noArray(),
		OutputArray	straight_qrcode = noArray()
	)

Python:
	cv.QRCodeDetector.detectAndDecodeCurved(	img[, points[, straight_qrcode]]	) ->	retval, points, straight_qrcode

Both detects and decodes QR code on a curved surface.

Parameters

img	grayscale or color (BGR) image containing QR code.
points	optional output array of vertices of the found QR code quadrangle. Will be empty if not found.
straight_qrcode	The optional output image containing rectified and binarized QR code

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setEpsX()

QRCodeDetector & cv::QRCodeDetector::setEpsX

(

double

epsX

)

Python:
	cv.QRCodeDetector.setEpsX(	epsX	) ->	retval

sets the epsilon used during the horizontal scan of QR code stop marker detection.

Parameters

epsX	Epsilon neighborhood, which allows you to determine the horizontal pattern of the scheme 1:1:3:1:1 according to QR code standard.

setEpsY()

QRCodeDetector & cv::QRCodeDetector::setEpsY

(

double

epsY

)

Python:
	cv.QRCodeDetector.setEpsY(	epsY	) ->	retval

sets the epsilon used during the vertical scan of QR code stop marker detection.

Parameters

epsY	Epsilon neighborhood, which allows you to determine the vertical pattern of the scheme 1:1:3:1:1 according to QR code standard.

setUseAlignmentMarkers()

QRCodeDetector & cv::QRCodeDetector::setUseAlignmentMarkers

(

bool

useAlignmentMarkers

)

Python:
	cv.QRCodeDetector.setUseAlignmentMarkers(	useAlignmentMarkers	) ->	retval

use markers to improve the position of the corners of the QR code

alignmentMarkers using by default

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

• opencv2/objdetect.hpp