lti::splitImageToXYZ Class Reference
[Color Analysis]

Split image in its XYZ norm channels. More...

#include <ltiSplitImageToXYZ.h>

Inheritance diagram for lti::splitImageToXYZ:

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Collaboration diagram for lti::splitImageToXYZ:

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List of all members.

Public Member Functions
virtual const char *	getTypename () const
virtual functor *	clone () const
virtual bool	apply (const image &img, channel &c1, channel &c2, channel &c3) const
virtual bool	apply (const image &img, channel8 &c1, channel8 &c2, channel8 &c3) const
virtual bool	apply (const rgbPixel &pixel, float &c1, float &c2, float &c3) const
virtual bool	apply (const rgbPixel &pixel, ubyte &c1, ubyte &c2, ubyte &c3) const

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Detailed Description

Split image in its XYZ norm channels.

The following is an excerpt of this page

RGB values in a particular set of primaries can be transformed to and from CIE XYZ via a 3x3 matrix transform. These transforms involve tristimulus values, that is a set of three linear-light components that conform to the CIE color-matching functions. CIE XYZ is a special set of tristimulus values. In XYZ, any color is represented as a set of positive values.

To transform from XYZ to RGB (with D65 white point), the matrix transform used is [3]:

[ R ] [ 3.240479 -1.537150 -0.498535 ] [ X ]
[ G ] = [ -0.969256 1.875992 0.041556 ] * [ Y ]
[ B ] [ 0.055648 -0.204043 1.057311 ] [ Z ]

The range for valid R, G, B values is [0,1]. Note, this matrix has negative coefficients. Some XYZ color may be transformed to RGB values that are negative or greater than one. This means that not all visible colors can be produced using the RGB system.

The inverse transformation matrix is as follows:

[ X ] [ 0.412453 0.357580 0.180423 ] [ R ]
[ Y ] = [ 0.212671 0.715160 0.072169 ] * [ G ]
[ Z ] [ 0.019334 0.119193 0.950227 ] [ B ]

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Member Function Documentation

virtual bool lti::splitImageToXYZ::apply	(	const rgbPixel &	pixel,
		ubyte &	c1,
		ubyte &	c2,
		ubyte &	c3
	)			const [virtual]

on-copy

Implements lti::splitImage.

virtual bool lti::splitImageToXYZ::apply	(	const rgbPixel &	pixel,
		float &	c1,
		float &	c2,
		float &	c3
	)			const [virtual]

on-copy

Implements lti::splitImage.

virtual bool lti::splitImageToXYZ::apply	(	const image &	img,
		channel8 &	c1,
		channel8 &	c2,
		channel8 &	c3
	)			const [virtual]

on-copy

Implements lti::splitImage.

virtual bool lti::splitImageToXYZ::apply	(	const image &	img,
		channel &	c1,
		channel &	c2,
		channel &	c3
	)			const [virtual]

on-copy

Implements lti::splitImage.

virtual functor* lti::splitImageToXYZ::clone

(

)

const [virtual]

returns a pointer to a clone of the functor

Implements lti::functor.

virtual const char* lti::splitImageToXYZ::getTypename

(

)

const [virtual]

returns the name of this type

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

• ltiSplitImageToXYZ.h