Full reference peak signal to noise ratio (PSNR) algorithm https://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio. More...

#include <opencv2/quality/qualitypsnr.hpp>

Inheritance diagram for cv::quality::QualityPSNR:

Public Member Functions
void	clear () CV_OVERRIDE
	Implements Algorithm::clear() More...

cv::Scalar	compute (InputArray cmp) CV_OVERRIDE
	Compute the PSNR. More...

bool	empty () const CV_OVERRIDE
	Implements Algorithm::empty() More...

double	getMaxPixelValue () const
	return the maximum pixel value used for PSNR computation More...

void	setMaxPixelValue (double val)
	sets the maximum pixel value used for PSNR computation More...

Public Member Functions inherited from cv::quality::QualityBase
virtual	~QualityBase ()=default
	Destructor. More...

virtual void	getQualityMap (OutputArray dst) const
	Returns output quality map that was generated during computation, if supported by the algorithm. More...

Public Member Functions inherited from cv::Algorithm
	Algorithm ()

virtual	~Algorithm ()

virtual String	getDefaultName () const

virtual void	read (const FileNode &fn)
	Reads algorithm parameters from a file storage. More...

virtual void	save (const String &filename) const

virtual void	write (FileStorage &fs) const
	Stores algorithm parameters in a file storage. More...

void	write (FileStorage &fs, const String &name) const

void	write (const Ptr< FileStorage > &fs, const String &name=String()) const

Static Public Member Functions
static cv::Scalar	compute (InputArray ref, InputArray cmp, OutputArray qualityMap, double maxPixelValue=QualityPSNR::MAX_PIXEL_VALUE_DEFAULT)
	static method for computing quality More...

static Ptr< QualityPSNR >	create (InputArray ref, double maxPixelValue=QualityPSNR::MAX_PIXEL_VALUE_DEFAULT)
	Create an object which calculates quality. More...

Static Public Member Functions inherited from cv::Algorithm
template<typename _Tp >
static Ptr< _Tp >	load (const String &filename, const String &objname=String())
	Loads algorithm from the file. More...

template<typename _Tp >
static Ptr< _Tp >	loadFromString (const String &strModel, const String &objname=String())
	Loads algorithm from a String. More...

template<typename _Tp >
static Ptr< _Tp >	read (const FileNode &fn)
	Reads algorithm from the file node. More...

Static Public Attributes
static const int	MAX_PIXEL_VALUE_DEFAULT = 255
	Default maximum pixel value. More...

Protected Member Functions
	QualityPSNR (Ptr< QualityMSE > qualityMSE, double maxPixelValue)
	Constructor. More...

Protected Member Functions inherited from cv::Algorithm
void	writeFormat (FileStorage &fs) const

Static Protected Member Functions
static double	_mse_to_psnr (double mse, double max_pixel_value)

static cv::Scalar	_mse_to_psnr (cv::Scalar mse, double max_pixel_value)

Protected Attributes
double	_maxPixelValue = QualityPSNR::MAX_PIXEL_VALUE_DEFAULT

Ptr< QualityMSE >	_qualityMSE

Protected Attributes inherited from cv::quality::QualityBase
_mat_type	_qualityMap
	Output quality maps if generated by algorithm. More...

Additional Inherited Members
Protected Types inherited from cv::quality::QualityBase
using	_mat_type = cv::UMat
	internal mat type default More...

Detailed Description

Full reference peak signal to noise ratio (PSNR) algorithm https://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio.

Constructor & Destructor Documentation

◆ QualityPSNR()

cv::quality::QualityPSNR::QualityPSNR	(	Ptr< QualityMSE >	qualityMSE,
		double	maxPixelValue
	)

inlineprotected

Constructor.

Member Function Documentation

◆ _mse_to_psnr() [1/2]

static double cv::quality::QualityPSNR::_mse_to_psnr	(	double	mse,
		double	max_pixel_value
	)

inlinestaticprotected

◆ _mse_to_psnr() [2/2]

static cv::Scalar cv::quality::QualityPSNR::_mse_to_psnr	(	cv::Scalar	mse,
		double	max_pixel_value
	)

inlinestaticprotected

◆ clear()

void cv::quality::QualityPSNR::clear ( )

inlinevirtual

Python:
	cv.quality.QualityPSNR.clear(		) ->	None

Implements Algorithm::clear()

Reimplemented from cv::quality::QualityBase.

◆ compute() [1/2]

cv::Scalar cv::quality::QualityPSNR::compute ( InputArray cmp )

inlinevirtual


cv.quality.QualityPSNR.compute(	cmp	) ->	retval
cv.quality.QualityPSNR.compute(	ref, cmp[, qualityMap[, maxPixelValue]]	) ->	retval, qualityMap
cv.quality.QualityPSNR_compute(	ref, cmp[, qualityMap[, maxPixelValue]]	) ->	retval, qualityMap

Compute the PSNR.

Parameters

cmp	Comparison image

Returns: Per-channel PSNR value, or std::numeric_limits<double>::infinity() if the MSE between the two images == 0

Implements cv::quality::QualityBase.

◆ compute() [2/2]

static cv::Scalar cv::quality::QualityPSNR::compute	(	InputArray	ref,
		InputArray	cmp,
		OutputArray	qualityMap,
		double	maxPixelValue = `QualityPSNR::MAX_PIXEL_VALUE_DEFAULT`
	)

inlinestatic


cv.quality.QualityPSNR.compute(	cmp	) ->	retval
cv.quality.QualityPSNR.compute(	ref, cmp[, qualityMap[, maxPixelValue]]	) ->	retval, qualityMap
cv.quality.QualityPSNR_compute(	ref, cmp[, qualityMap[, maxPixelValue]]	) ->	retval, qualityMap

static method for computing quality

Parameters

ref	reference image
cmp	comparison image
qualityMap	output quality map, or cv::noArray()
maxPixelValue	maximum per-channel value for any individual pixel; eg 255 for uint8 image

Returns: PSNR value, or std::numeric_limits<double>::infinity() if the MSE between the two images == 0

◆ create()

static Ptr<QualityPSNR> cv::quality::QualityPSNR::create	(	InputArray	ref,
		double	maxPixelValue = `QualityPSNR::MAX_PIXEL_VALUE_DEFAULT`
	)

inlinestatic

Python:
	cv.quality.QualityPSNR.create(	ref[, maxPixelValue]	) ->	retval
	cv.quality.QualityPSNR_create(	ref[, maxPixelValue]	) ->	retval

Create an object which calculates quality.

Parameters

ref	input image to use as the source for comparison
maxPixelValue	maximum per-channel value for any individual pixel; eg 255 for uint8 image

◆ empty()

bool cv::quality::QualityPSNR::empty ( ) const

inlinevirtual

Python:
	cv.quality.QualityPSNR.empty(		) ->	retval

Implements Algorithm::empty()

Reimplemented from cv::quality::QualityBase.

◆ getMaxPixelValue()

double cv::quality::QualityPSNR::getMaxPixelValue ( ) const

inline

Python:
	cv.quality.QualityPSNR.getMaxPixelValue(		) ->	retval

return the maximum pixel value used for PSNR computation

◆ setMaxPixelValue()

void cv::quality::QualityPSNR::setMaxPixelValue ( double val )

inline

Python:
	cv.quality.QualityPSNR.setMaxPixelValue(	val	) ->	None

sets the maximum pixel value used for PSNR computation

Parameters

val	Maximum pixel value

Member Data Documentation

◆ _maxPixelValue

double cv::quality::QualityPSNR::_maxPixelValue = QualityPSNR::MAX_PIXEL_VALUE_DEFAULT

protected

◆ _qualityMSE

Ptr<QualityMSE> cv::quality::QualityPSNR::_qualityMSE

protected

◆ MAX_PIXEL_VALUE_DEFAULT

const int cv::quality::QualityPSNR::MAX_PIXEL_VALUE_DEFAULT = 255

static

Default maximum pixel value.

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

opencv2/quality/qualitypsnr.hpp

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QualityPSNR()

Member Function Documentation

◆ _mse_to_psnr() [1/2]

◆ _mse_to_psnr() [2/2]

◆ clear()

◆ compute() [1/2]

◆ compute() [2/2]

◆ create()

◆ empty()

◆ getMaxPixelValue()

◆ setMaxPixelValue()

Member Data Documentation

◆ _maxPixelValue

◆ _qualityMSE

◆ MAX_PIXEL_VALUE_DEFAULT