cv::quality::QualityPSNR Class Reference

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()
cv::Scalar	compute (InputArray cmp) CV_OVERRIDE
	Compute the PSNR.
bool	empty () const CV_OVERRIDE
	Implements Algorithm::empty()
double	getMaxPixelValue () const
	return the maximum pixel value used for PSNR computation
void	setMaxPixelValue (double val)
	sets the maximum pixel value used for PSNR computation
Public Member Functions inherited from cv::quality::QualityBase
virtual	~QualityBase ()=default
	Destructor.
void	clear () CV_OVERRIDE
	Implements Algorithm::clear()
virtual cv::Scalar	compute (InputArray img)=0
	Compute quality score per channel with the per-channel score in each element of the resulting cv::Scalar. See specific algorithm for interpreting result scores.
bool	empty () const CV_OVERRIDE
	Implements Algorithm::empty()
virtual void	getQualityMap (OutputArray dst) const
	Returns output quality map that was generated during computation, if supported by the algorithm
Public Member Functions inherited from cv::Algorithm
	Algorithm ()
virtual	~Algorithm ()
virtual void	clear ()
	Clears the algorithm state.
virtual bool	empty () const
	Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read.
virtual String	getDefaultName () const
virtual void	read (const FileNode &fn)
	Reads algorithm parameters from a file storage.
virtual void	save (const String &filename) const
void	write (const Ptr< FileStorage > &fs, const String &name=String()) const
virtual void	write (FileStorage &fs) const
	Stores algorithm parameters in a file storage.
void	write (FileStorage &fs, const String &name) 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
static Ptr< QualityPSNR >	create (InputArray ref, double maxPixelValue=QualityPSNR::MAX_PIXEL_VALUE_DEFAULT)
	Create an object which calculates quality.
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.
template<typename _Tp >
static Ptr< _Tp >	loadFromString (const String &strModel, const String &objname=String())
	Loads algorithm from a String.
template<typename _Tp >
static Ptr< _Tp >	read (const FileNode &fn)
	Reads algorithm from the file node.

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

Protected Member Functions
	QualityPSNR (Ptr< QualityMSE > qualityMSE, double maxPixelValue)
	Constructor.
Protected Member Functions inherited from cv::Algorithm
void	writeFormat (FileStorage &fs) const

Static Protected Member Functions
static cv::Scalar	_mse_to_psnr (cv::Scalar mse, double max_pixel_value)
static double	_mse_to_psnr (double 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.

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

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

inlinestaticprotected

_mse_to_psnr() [2/2]

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

inlinestaticprotected

clear()

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

inlinevirtual

Implements Algorithm::clear()

Reimplemented from cv::quality::QualityBase.

compute() [1/2]

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

inlinevirtual

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

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

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

Implements Algorithm::empty()

Reimplemented from cv::quality::QualityBase.

getMaxPixelValue()

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

inline

return the maximum pixel value used for PSNR computation

setMaxPixelValue()

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

inline

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.

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

• opencv2/quality/qualitypsnr.hpp