EXTENDING THE CIE 2006 MODEL
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1 MARK D. FAIRCHILD & YUTA ASANO CUSTOM COLOR MATCHING FUNCTIONS: EXTENDING THE CIE 2006 MODEL
2 TWO BIG QUESTIONS
3 WHAT DO YOU SEE?
4 DO YOU SEE WHAT I SEE?
5 CIE COLORIMETRY 1931 & 1964, 2- & 10-deg Tristimulus values Wavelength, nm
6 INDIVIDUALS Stiles & Burch (1959)
7 MONTE CARLO Fairchild & Heckaman (2013) and in press Build individual observers Statistically analyze and create Nimeroff system
8 RANDOMLY SELECT Lens (Density) Macula (Density) L, M, & S Cones (Shift) Build Cone Fundamentals Compute Other CMFs
9 1000 OBSERVERS
10 ALFVIN & FAIRCHILD CYAN SAMPLE
11 CIE 2006 APPROACH TC1-36 Fundamental Chromaticity Diagram with Physiological Axes CIE (2006) Compute cone responsivities (LMS) as a function of age and field size
12 CIE 2006 Model [ l (λ) = α (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) ] i,l [ ] m (λ) = α i,m (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) [ s (λ) = α (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) ] i,s
13 CIE 2006 Cone Absorptivity Spectra f(field size) Model [ ] l (λ) = α i,l (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) [ ] m (λ) = α i,m (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) [ s (λ) = α (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) ] i,s
14 CIE 2006 Cone Absorptivity Spectra f(field size) Model [ ] l (λ) = α i,l (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) [ ] m (λ) = α i,m (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) [ s (λ) = α (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) ] i,s Macular Density f(field size)
15 CIE 2006 Cone Absorptivity Spectra f(field size) Model [ ] l (λ) = α i,l (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) [ ] m (λ) = α i,m (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) [ s (λ) = α (λ) 10 D τ,max,macula D macula,relative (λ ) D τ,ocul (λ ) ] i,s Macular Density f(field size) Ocular Media Density f(age)
16 MEAN OBSERVERS
17 MEAN OBSERVERS
18 MEAN OBSERVERS
19 MEAN OBSERVERS
20 EXAMPLES: L-, M-, & S-Cone Fundamentals (2- & Age 32) Relative Sensitivity Wavelength (nm) l-bar (2) m-bar (2) s-bar (2) l-bar (10) m-bar (10) s-bar (10) Relative Sensitivity L-, M-, & S-Cone Fundamentals Ages 20 & 80) l-bar (20) m-bar (20) s-bar (20) l-bar (80) m-bar (80) s-bar (80) Wavelength (nm)
21 EXAMPLES: 2 xbar xbar 1931 ybar 1931 ybar 1931 zbar 1931 zbar x25yrs,2degree y25yrs,2degree 1.5 x25,10degree y25,10degree z25yrs,2degree z25,10degree x65yrs,2degree x65,10degree Tristimulus values y65yrs,2degree z65yrs,2degree Tristimulus values y65,10degree z65,10degree Wavelength (nm) Wavelength (nm)
22 NOT INDIVIDUALS
23 NOT INDIVIDUALS Let s combine CIE 2006 means with Monte Carlo individuals
24 ASANO MODEL Start with CIE 2006 mean observers Perturb with individual variations in physiological components Create individual color matching functions Monte Carlo or measurement driven
25 CIE INDIVIDUALS Input: age, field size, 8 physiological parameters Output: lms-cmfs (= Cone Fundamentals) Standard deviations derived from past studies, then scaled to fit a set of color matching data LENS [%] OBTAINED STANDARD DEVIATIONS MACULA [%] DENSITY [%] λ MAX SHIFT [nm] L M S L M S
26 CIE INDIVIDUALS Stiles & Burch 49 Observers Fig sets of rgb-cmfs generated by the proposed observer model (gray lines) aiming to predict the Stiles and Burch s experiment results. The maxima and minima of 49 sets of CMFs for the Stiles and Burch s experiment participants are superimposed as color-shaded areas. All the CMFs are normalized to equal area.
27 CIE INDIVIDUALS
28 NO LONGER MEAN Nice, Individual, Observers
29 INDIVIDUALIZED COLORIMETRY Observer Calibrator (5 Matches) Individual Parameters Asano Model Individual (Customized) Color Matching Functions
30 OBSERVER METAMERISM DEMO
31 Spectra Generated from Different LEDs to Magnify Inter-Observer Variability Reference MatchPrm.1 MatchPrm.2 MatchPrm Wavelength [nm]
32 CATEGORICAL OBSERVERS STEP 1: GENERATE 10,000 CMFS BY INDIVIDUAL OBSERVER MODEL + MONTE CARLO SIMULATION STEP 2: CLUSTER ANALYSIS
33 CATEGORIES Following on the work of Sarkar et al. Tab. 3.8 Ages and eight physiological parameters for the first ten categorical observers. Cat. Obs. ID Age Lens Density [%] Macula Density [%] Density in L [%] Density in M [%] Density in S [%] Shift in L [nm] Shift in M [nm] Shift in S [nm]
34 CATEGORIES Following on the work of Sarkar et al. (a) 2-degree (b) 10-degree Relative Response [ ] Cat.Obs. 01 Cat.Obs. 02 Cat.Obs. 03 Cat.Obs. 04 Cat.Obs. 05 Cat.Obs. 06 Cat.Obs. 07 Cat.Obs. 08 Cat.Obs. 09 Cat.Obs. 10 Relative Response [ ] Cat.Obs. 01 Cat.Obs. 02 Cat.Obs. 03 Cat.Obs. 04 Cat.Obs. 05 Cat.Obs. 06 Cat.Obs. 07 Cat.Obs. 08 Cat.Obs. 09 Cat.Obs Wavelength [nm] Wavelength [nm] Fig lms-cmfs (cone fundamentals) of the first ten categorical observers for a field size of 2 (a) and 10 (b). Each function is area-normalized.
35 CONFIDENCE ELLIPSOIDS Mean and Variance (+Covariance CMFs) CMF Responsivity Wavelength in nm Metameric Matches: 95 % Measured and Predicted
36 ASANO ISOCHROMATIC PLATES Cat 1 Cat 2 Cat 3 Cat 4 Cat 5 Cat 6 Cat 7 Cat 8 Cat 9 Cat 10 Fig. 4.9 Visualization results of a spectral pseudoisochromatic image targeted at categorical observer 5, perceived by each of the ten categorical observers.
37 CONCLUSIONS / FUTURE Individualized Colorimetry (Custom CMFs) Complete Colorimetry (Nimeroff et al.) Here Now (Almost) Applications: e.g. cinema with laser projectors
38 THANK YOU
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