boofcv.alg.color

Class ColorLab

java.lang.Object

boofcv.alg.color.ColorLab

public class ColorLab
extends java.lang.Object

Conversion between RGB and CIE LAB color space. LAB color is designed to approximate human vision. L for lightness and a and b for the color-opponent dimensions, The reference white used in the conversions below is D65.

Note:

• L has a range of 0 to 100
• L = 0 is black and L* = 100 is diffuse white

Field Summary

Fields

Modifier and Type	Field and Description
static double	epsilon
static float	epsilon_f
static double	kappa
static float	kappa_f
static double	Xr
static float	Xr_f
static double	Yr
static float	Yr_f
static double	Zr
static float	Zr_f

Constructor Summary

Constructors

Constructor and Description
ColorLab()

Method Summary

Modifier and Type	Method and Description
static void	rgbToLab_F32(Planar<GrayF32> rgb, Planar<GrayF32> lab) Convert a 3-channel Planar image from RGB into LAB.
static void	rgbToLab_U8(Planar<GrayU8> rgb, Planar<GrayF32> lab) Convert a 3-channel Planar image from RGB into LAB.
static void	srgbToLab(double r, double g, double b, double[] lab) Conversion from normalized RGB into LAB.
static void	srgbToLab(float r, float g, float b, float[] lab) Conversion from normalized RGB into LAB.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

epsilon

public static final double epsilon

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Constant Field Values

kappa

public static final double kappa

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Constant Field Values

Xr

public static final double Xr

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Constant Field Values

Yr

public static final double Yr

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Constant Field Values

Zr

public static final double Zr

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Constant Field Values

epsilon_f

public static final float epsilon_f

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Constant Field Values

kappa_f

public static final float kappa_f

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Constant Field Values

Xr_f

public static final float Xr_f

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Constant Field Values

Yr_f

public static final float Yr_f

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Constant Field Values

Zr_f

public static final float Zr_f

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Constant Field Values

Constructor Detail

ColorLab

public ColorLab()

Method Detail

srgbToLab

public static void srgbToLab(double r,
                             double g,
                             double b,
                             double[] lab)

Conversion from normalized RGB into LAB. Normalized RGB values have a range of 0:1

srgbToLab

public static void srgbToLab(float r,
                             float g,
                             float b,
                             float[] lab)

Conversion from normalized RGB into LAB. Normalized RGB values have a range of 0:1

rgbToLab_U8

public static void rgbToLab_U8(Planar<GrayU8> rgb,
                               Planar<GrayF32> lab)

Convert a 3-channel Planar image from RGB into LAB. RGB is assumed to have a range from 0:255 NOTE: Input and output image can be the same instance.

Parameters:

rgb - (Input) RGB encoded image

lab - (Output) LAB encoded image. L = channel 0, A = channel 1, B = channel 2

rgbToLab_F32

public static void rgbToLab_F32(Planar<GrayF32> rgb,
                                Planar<GrayF32> lab)

Convert a 3-channel Planar image from RGB into LAB. RGB is assumed to have a range from 0:255

NOTE: Input and output image can be the same instance.

Parameters:

rgb - (Input) RGB encoded image

lab - (Output) LAB encoded image. L = channel 0, A = channel 1, B = channel 2