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4.4.2.4 Class Diagrams for Compare ColoursIn colour physics, assessments of colours difference between two objects are usuallydone by assessment on the colour difference (delta) from a known standard.CIELAB and CIELCH are the most widely used standards that used for calculatingcolour difference between two objects.For standard CIELAB, the expressions for these colour differences are ∆L* ∆a* ∆b* orDL* Da* Db*; while for CIELCH the expressions for colour differences are and ∆L*∆C* ∆H* or DL* DC* DH*.Figure 4.18 on the next page presents the association between classes involved in“Compare Colours” use case. ColourDifference class is the class that used to define themost common colour difference used in colour physics which is Delta E and thecomponents used to calculate Delta E such as Delta a*, Delta b*, Delta c*, Delta h* andso on.The CompareColours class is the central place for doing colour difference calculation. Itcomputes the colour difference between the colours of two objects based on the givencondition of observer illuminant and colour encoding types.Again, you will find that the four classes identified during section 4.4.1.4, namelyCompareColourUI class, CompareColour class, CalculateColourDifference class andColourObject had been refined and replaced with other class names. This is inevitableas the associations between different classes under a particular use case need to berefined in order to facilitate the processing logic of colourimetric calculation.84
CompareColourscolourEncodingsIlluminantsCompareColours()getInstance : CompareColourscomputeWeights(Illuminant , Observer, Interval)computeWhitePoint(Illuminant, Observer)getAlgorithmNames()getAlgorithm(String)create (Class, Illuminant, Reflectance, Observer)convert(Class, XYZ, XYZ)getColourEncodingNames()getColourEncodingClass(String)ACCWFD50D55D65D75DaylightDeluxeF2F7F12TL83TL84U30ColourDifferenceDELTA_EDELTA_L_starDELTA_a_starDELTA_b_starDELTA_c_starDELTA_h_starDELTA_u_starDELTA_v_starDELTA_LDELTA_cDELTA_hColourDifference()getAlgorithm ()getAllDeltaNames()getValue(String)ColourEncodingCIELabCIELchCIELuvCYMKXYZRGBFigure 4.18: Class Diagrams for Compare Colours85
Page 2: 4.3.1 Use Case DiagramTo understand
Page 5 and 6: Use CaseGoal in ContextPrecondition
Page 7 and 8: Use CaseGoal in ContextPrecondition
Page 9 and 10: Alternative flows andexceptionsa) A
Page 11 and 12: 4.4 Use Case RealizationThe activit
Page 13 and 14: 4.4.1.1 Initiate User Session Colla
Page 15 and 16: 4.4.1.3 Search Colours Collaboratio
Page 17 and 18: 4.4.1.5 Import Colours Collaboratio
Page 19 and 20: 4.4.2 Class Diagram4.4.2.1 Class Di
Page 21 and 22: Each colour is considered as an obj
Page 23: SearchColoursobserverilluminantL_va
Page 27 and 28: InterfaceImportColourgetName ()getD
Page 29: 4.5 SummaryUse case driven object-o

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