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RGBPrime2YPrimeUVFunctor< T > Class Template Reference

Convert non-linear (gamma corrected) R'G'B' into Y'UV components. More...

#include <vigra/colorconversions.hxx>

Public Types

typedef TinyVector< T, 3 > argument_type
 
typedef NumericTraits< T >::RealPromote component_type
 
typedef TinyVector< component_type, 3 > result_type
 
typedef TinyVector< component_type, 3 > value_type
 

Public Member Functions

template<class V >
result_type operator() (V const &rgb) const
 
 RGBPrime2YPrimeUVFunctor ()
 
 RGBPrime2YPrimeUVFunctor (component_type max)
 

Detailed Description

template<class T>
class vigra::RGBPrime2YPrimeUVFunctor< T >

Convert non-linear (gamma corrected) R'G'B' into Y'UV components.

#include <vigra/colorconversions.hxx>
Namespace: vigra

According to the NTSC analog video standard, the functor realizes the transformation

\[
    \begin{array}{rcl}
    Y' & = & 0.299\enspace R / R_{max} + 0.587\enspace G / G_{max} + 0.114\enspace B / B_{max}\\
    U & = & -0.147\enspace R / R_{max} - 0.289\enspace G / G_{max} + 0.436\enspace B / B_{max} \\
    V & = & 0.615\enspace R / R_{max} - 0.515\enspace G / G_{max} - 0.100\enspace B / B_{max}
    \end{array}
\]

By default, $ R_{max} = G_{max} = B_{max} = 255 $. This default can be overridden in the constructor. Y' represents the luminance ("brightness") of the color. The transformation is scaled so that the following bounds apply:

\[
    \begin{array}{rcl}
    0 \leq & Y' & \leq 1 \\
    -0.436 \leq & U & \leq 0.436 \\
    -0.615 \leq & V & \leq 0.615
    \end{array}
\]

Traits defined:

FunctorTraits::isUnaryFunctor is true (VigraTrueType)

Member Typedef Documentation

◆ component_type

template<class T >
typedef NumericTraits<T>::RealPromote component_type

the result's component type

◆ argument_type

template<class T >
typedef TinyVector<T, 3> argument_type

the functor's argument type

◆ result_type

the functor's result type

◆ value_type

Deprecated:
use argument_type and result_type

Constructor & Destructor Documentation

◆ RGBPrime2YPrimeUVFunctor() [1/2]

template<class T >
RGBPrime2YPrimeUVFunctor ( )

default constructor. The maximum value for each RGB component defaults to 255.

◆ RGBPrime2YPrimeUVFunctor() [2/2]

constructor

  • max - the maximum value for each RGB component

Member Function Documentation

◆ operator()()

template<class T >
template<class V >
result_type operator() ( V const rgb) const

apply the transformation


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

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

html generated using doxygen and Python
vigra 1.12.1