OpenCV  4.10.0
Open Source Computer Vision
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Public Member Functions | Static Public Member Functions | Static Public Attributes | Protected Member Functions | Static Protected Member Functions | Protected Attributes | List of all members
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>

Collaboration 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.
 
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 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< QualityPSNRcreate (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< _Tpload (const String &filename, const String &objname=String())
 Loads algorithm from the file.
 
template<typename _Tp >
static Ptr< _TploadFromString (const String &strModel, const String &objname=String())
 Loads algorithm from a String.
 
template<typename _Tp >
static Ptr< _Tpread (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
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
Python:
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
cmpComparison 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
Python:
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
refreference image
cmpcomparison image
qualityMapoutput quality map, or cv::noArray()
maxPixelValuemaximum 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
refinput image to use as the source for comparison
maxPixelValuemaximum 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
valMaximum 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: