cv::barcode::BarcodeDetector Class Reference

#include <opencv2/objdetect/barcode.hpp>

Collaboration diagram for cv::barcode::BarcodeDetector:

Public Member Functions
	BarcodeDetector ()
	Initialize the BarcodeDetector.
	BarcodeDetector (CV_WRAP_FILE_PATH const std::string &prototxt_path, CV_WRAP_FILE_PATH const std::string &model_path)
	Initialize the BarcodeDetector.
	~BarcodeDetector ()
bool	decodeWithType (InputArray img, InputArray points, std::vector< std::string > &decoded_info, std::vector< std::string > &decoded_type) const
	Decodes barcode in image once it's found by the detect() method.
bool	detectAndDecodeWithType (InputArray img, std::vector< std::string > &decoded_info, std::vector< std::string > &decoded_type, OutputArray points=noArray()) const
	Both detects and decodes barcode.
void	getDetectorScales (std::vector< float > &sizes) const
	Returns detector box filter sizes.
double	getDownsamplingThreshold () const
	Get detector downsampling threshold.
double	getGradientThreshold () const
	Get detector gradient magnitude threshold.
BarcodeDetector &	setDetectorScales (const std::vector< float > &sizes)
	Set detector box filter sizes.
BarcodeDetector &	setDownsamplingThreshold (double thresh)
	Set detector downsampling threshold.
BarcodeDetector &	setGradientThreshold (double thresh)
	Set detector gradient magnitude threshold.
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

Constructor & Destructor Documentation

BarcodeDetector() [1/2]

cv::barcode::BarcodeDetector::BarcodeDetector

(

)

Python:
	cv.barcode.BarcodeDetector(		) ->	<barcode_BarcodeDetector object>
	cv.barcode.BarcodeDetector(	prototxt_path, model_path	) ->	<barcode_BarcodeDetector object>

Initialize the BarcodeDetector.

BarcodeDetector() [2/2]

cv::barcode::BarcodeDetector::BarcodeDetector	(	CV_WRAP_FILE_PATH const std::string &	prototxt_path,
		CV_WRAP_FILE_PATH const std::string &	model_path )

Python:
	cv.barcode.BarcodeDetector(		) ->	<barcode_BarcodeDetector object>
	cv.barcode.BarcodeDetector(	prototxt_path, model_path	) ->	<barcode_BarcodeDetector object>

Initialize the BarcodeDetector.

Parameters allow to load optional Super Resolution DNN model for better quality.

Parameters

prototxt_path	prototxt file path for the super resolution model
model_path	model file path for the super resolution model

~BarcodeDetector()

cv::barcode::BarcodeDetector::~BarcodeDetector

(

)

Member Function Documentation

decodeWithType()

bool cv::barcode::BarcodeDetector::decodeWithType	(	InputArray	img,
		InputArray	points,
		std::vector< std::string > &	decoded_info,
		std::vector< std::string > &	decoded_type ) const

Python:
	cv.barcode.BarcodeDetector.decodeWithType(	img, points	) ->	retval, decoded_info, decoded_type

Decodes barcode in image once it's found by the detect() method.

Parameters

img	grayscale or color (BGR) image containing bar code.
points	vector of rotated rectangle vertices found by detect() method (or some other algorithm). For N detected barcodes, the dimensions of this array should be [N][4]. Order of four points in vector<Point2f> is bottomLeft, topLeft, topRight, bottomRight.
decoded_info	UTF8-encoded output vector of string or empty vector of string if the codes cannot be decoded.
decoded_type	vector strings, specifies the type of these barcodes

Returns

true if at least one valid barcode have been found

detectAndDecodeWithType()

bool cv::barcode::BarcodeDetector::detectAndDecodeWithType	(	InputArray	img,
		std::vector< std::string > &	decoded_info,
		std::vector< std::string > &	decoded_type,
		OutputArray	points = noArray() ) const

Python:
	cv.barcode.BarcodeDetector.detectAndDecodeWithType(	img[, points]	) ->	retval, decoded_info, decoded_type, points

Both detects and decodes barcode.

Parameters

img	grayscale or color (BGR) image containing barcode.
decoded_info	UTF8-encoded output vector of string(s) or empty vector of string if the codes cannot be decoded.
decoded_type	vector of strings, specifies the type of these barcodes
points	optional output vector of vertices of the found barcode rectangle. Will be empty if not found.

Returns

true if at least one valid barcode have been found

Here is the call graph for this function:

getDetectorScales()

void cv::barcode::BarcodeDetector::getDetectorScales

(

std::vector< float > &

sizes

)

const

Python:
	cv.barcode.BarcodeDetector.getDetectorScales(		) ->	sizes

Returns detector box filter sizes.

Parameters

sizes

output parameter for returning the sizes.

getDownsamplingThreshold()

double cv::barcode::BarcodeDetector::getDownsamplingThreshold

(

)

const

Python:
	cv.barcode.BarcodeDetector.getDownsamplingThreshold(		) ->	retval

Get detector downsampling threshold.

Returns

detector downsampling threshold

getGradientThreshold()

double cv::barcode::BarcodeDetector::getGradientThreshold

(

)

const

Python:
	cv.barcode.BarcodeDetector.getGradientThreshold(		) ->	retval

Get detector gradient magnitude threshold.

Returns

detector gradient magnitude threshold.

setDetectorScales()

BarcodeDetector & cv::barcode::BarcodeDetector::setDetectorScales

(

const std::vector< float > &

sizes

)

Python:
	cv.barcode.BarcodeDetector.setDetectorScales(	sizes	) ->	retval

Set detector box filter sizes.

Adjusts the value and the number of box filters used in the detect step. The filter sizes directly correlate with the expected line widths for a barcode. Corresponds to expected barcode distance. If the downsampling limit is increased, filter sizes need to be adjusted in an inversely proportional way.

Parameters

sizes

box filter sizes, relative to minimum dimension of the image (default [0.01, 0.03, 0.06, 0.08])

setDownsamplingThreshold()

BarcodeDetector & cv::barcode::BarcodeDetector::setDownsamplingThreshold

(

double

thresh

)

Python:
	cv.barcode.BarcodeDetector.setDownsamplingThreshold(	thresh	) ->	retval

Set detector downsampling threshold.

By default, the detect method resizes the input image to this limit if the smallest image size is is greater than the threshold. Increasing this value can improve detection accuracy and the number of results at the expense of performance. Correlates with detector scales. Setting this to a large value will disable downsampling.

Parameters

thresh

downsampling limit to apply (default 512)

See also

setDetectorScales

setGradientThreshold()

BarcodeDetector & cv::barcode::BarcodeDetector::setGradientThreshold

(

double

thresh

)

Python:
	cv.barcode.BarcodeDetector.setGradientThreshold(	thresh	) ->	retval

Set detector gradient magnitude threshold.

Sets the coherence threshold for detected bounding boxes. Increasing this value will generate a closer fitted bounding box width and can reduce false-positives. Values between 16 and 1024 generally work, while too high of a value will remove valid detections.

Parameters

thresh

gradient magnitude threshold (default 64).

---

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

• opencv2/objdetect/barcode.hpp