Functions to convert between different colour spaces. More...

Functions
template<class T >
void	vil_colour_space_RGB_to_YIQ (T const in[3], T out[3])
	Linear transformation from RGB to YIQ colour spaces.
template<class T >
void	vil_colour_space_YIQ_to_RGB (T const in[3], T out[3])
	Linear transformation from YIQ to RGB colour spaces.
template<class T >
void	vil_colour_space_RGB_to_HSV (T r, T g, T b, T h, T s, T *v)
	Transform from RGB to HSV colour spaces.
template<class T >
void	vil_colour_space_HSV_to_RGB (T h, T s, T v, T r, T g, T *b)
	Transform from HSV to RGB colour space.
template<class T >
void	vil_colour_space_RGB_to_YUV (T const in[3], T out[3])
	Linear transformation from RGB to YUV colour spaces.
template<class T >
void	vil_colour_space_YUV_to_RGB (T const in[3], T out[3])
	Linear transformation from YUV to RGB colour spaces.
template<class T >
void	vil_colour_space_RGB_to_YPbPr_601 (T const RGB[3], T YPbPr[3])
	Transformation from analog RGB to analog YPbPr colour spaces.
template<class T >
void	vil_colour_space_YPbPr_601_to_RGB (T const YPbPr[3], T RGB[3])
	Transformation from analog YPbPr to RGB colour spaces.
void	vil_colour_space_RGB_to_YCbCr_601 (const unsigned char RGB[3], unsigned char YCbCr[3])
	Transformation from 8 bit RGB to 8 bit YCbCr colour spaces.
void	vil_colour_space_YCbCr_601_to_RGB (const unsigned char YCbCr[3], unsigned char RGB[3])
	Transformation from 8 bit YCbCr to 8 bit RGB colour spaces.

Detailed Description

Functions to convert between different colour spaces.

Functions to convert between different colour spaces. See Foley and van Dam, "Computer Graphics, Principles and Practice".

Author:: fsm

Definition in file vil_colour_space.h.

Function Documentation

template<class T >

void vil_colour_space_HSV_to_RGB	(	T	h,
		T	s,
		T	v,
		T *	r,
		T *	g,
		T *	b
	)

Transform from HSV to RGB colour space.

The input HSV values will lie in the ranges: H : [0, 360) (an angle, in bloody degrees) S : [0, 1] V : [0, 255]

The output RGB values will lie in [0, 255]

[HSV is also known as HSB]

Definition at line 76 of file vil_colour_space.cxx.

template<class T >

void vil_colour_space_RGB_to_HSV	(	T	r,
		T	g,
		T	b,
		T *	h,
		T *	s,
		T *	v
	)

Transform from RGB to HSV colour spaces.

The input RGB values must lie in [0, L], for some positive L. Usually L=1 or 255.

The output HSV values will lie in the ranges: H : [0, 360) (an angle, in bloody degrees) S : [0, 1] V : [0, L]

[HSV is also known as HSB]

       green --- yellow     //
      /    \     /     \    //
   cyan --- white ---- red  //
      \    /     \     /    //
       blue  --- magenta    //
                            //

Definition at line 41 of file vil_colour_space.cxx.

void vil_colour_space_RGB_to_YCbCr_601	(	const unsigned char	RGB[3],
		unsigned char	YCbCr[3]
	)

Transformation from 8 bit RGB to 8 bit YCbCr colour spaces.

The input and out value lie in the ranges:

R'd, G'd, B'd in {0, 1, 2, ..., 255}
Y' in {16, 17, ..., 235} with * footroom in {1, 2, ..., 15} * headroom in {236, 237, ..., 254} * sync. in {0, 255}
Cb, Cr in {16, 17, ..., 240}

Definition at line 211 of file vil_colour_space.cxx.

template<class T >

void vil_colour_space_RGB_to_YIQ	(	T const	in[3],
		T	out[3]
	)

Linear transformation from RGB to YIQ colour spaces.

Definition at line 15 of file vil_colour_space.cxx.

template<class T >

void vil_colour_space_RGB_to_YPbPr_601	(	T const	RGB[3],
		T	YPbPr[3]
	)

Transformation from analog RGB to analog YPbPr colour spaces.

The input and out value lie in the ranges:

R', G', B' in [0; 1]
Y' in [0; 1]
Pb in [-0.5; 0.5]
Pr in [-0.5; 0.5]

Definition at line 174 of file vil_colour_space.cxx.

template<class T >

void vil_colour_space_RGB_to_YUV	(	T const	in[3],
		T	out[3]
	)

Linear transformation from RGB to YUV colour spaces.

Definition at line 144 of file vil_colour_space.cxx.

void vil_colour_space_YCbCr_601_to_RGB	(	const unsigned char	YCbCr[3],
		unsigned char	RGB[3]
	)

Transformation from 8 bit YCbCr to 8 bit RGB colour spaces.

The input and out value lie in the ranges:

Y' in {16, 17, ..., 235} with * footroom in {1, 2, ..., 15} * headroom in {236, 237, ..., 254} * sync. in {0, 255}
Cb, Cr in {16, 17, ..., 240}
R'd, G'd, B'd in {0, 1, 2, ..., 255}

Definition at line 227 of file vil_colour_space.cxx.

template<class T >

void vil_colour_space_YIQ_to_RGB	(	T const	in[3],
		T	out[3]
	)

Linear transformation from YIQ to RGB colour spaces.

Definition at line 23 of file vil_colour_space.cxx.

template<class T >

void vil_colour_space_YPbPr_601_to_RGB	(	T const	YPbPr[3],
		T	RGB[3]
	)

Transformation from analog YPbPr to RGB colour spaces.

The input and out value lie in the ranges:

Y' in [0; 1]
Pb in [-0.5; 0.5]
Pr in [-0.5; 0.5]
R', G', B' in [0; 1]

Definition at line 192 of file vil_colour_space.cxx.

template<class T >

void vil_colour_space_YUV_to_RGB	(	T const	in[3],
		T	out[3]
	)

Linear transformation from YUV to RGB colour spaces.

Definition at line 153 of file vil_colour_space.cxx.