Table of Contents - DSpace

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4.4.2.2 Class Diagrams Associate to the Representation of ColourWalker (1996) revealed that most computer applications specify colour in threecomponentsystems which are RGB (Red, Green and Blue), HLS (Hue, Lightness andSaturation), or HSV (Hue, Saturation and Value). Derived from the mechanisms ofhuman colour perception, these colour spaces map relatively straightforwardly onto thedisplay and printing technologies.However, he pointed out that although human colour perception is well modelled by thethree-component systems mentioned above, the physical interaction of light and matteris far more complicated. A task as simple as rendering a scene under a variety of lightsources: daylight, incandescent and fluorescent indoor lighting, and mercury andsodium vapour street lights cannot be accomplished without knowing the spectra oflight sources and the spectral response of pigments.Once the spectrum of the light impinging upon a point in the image plane is known, theeye's perception of that spectrum must be determined. Finally, display arguments mustbe calculated which evoke that perception in the viewer.From the observations mentioned above, in order to model the colour representationwhich closes to real world phenomena, the colour should allowed to be examined,compared and presented under different circumstances in which at most of time,determined by the presence of a particular combination of illuminant and observer.In this project, as the presence of fast changing illuminant and observer greatly affectthe visual appearance of an object (in the form of reflectance of spectrum wavelength),the researcher assumed that persisted colour does not exist in the system going to bedeveloped.80
Each colour is considered as an object, which stores one set of fixed data regarding thereflectance data of the colour. One set of reflectance data generates one colour under aparticular illuminant and observer.The class diagrams associate to the representation of colour are shown as Figure 4.15below:-ReflectanceCondition_APERTURECondition_LIGHTFILTERCondition_SPECULARCondition_MODECondition_AMBIENTTEMPERATURECondition_AMBIENTHUMIDITYCondition_LENSPOSITIONCondition_LAMPUSEDCondition_FLASHESCondition_MEASUREMENTSCondition_AVERAGEALGORITHMType_MEASUREType_NEWLY_RECEIVEDSpectroType_RECIPEType_PROFILEDSpectrumMap: SortedMapSpectrumConditionsSpectrumStartWaveLengthIntervalValuesSpectrum(start, interval, values)Create (start, interval, values)getLongestWavelength()getShortestWaveLength()getInterval()getValues()Reflectance()Relfectance(spectrum, conditions)getSpectrum()setSpectrum(spectrum: Spectrum)getSpectrumMap()setSpectrumMap(SortedMap)getConditions() : MapsetConditions(condition)getSpectro()setSpectro(Spectro)getType()setType(Type)Figure 4.15: Class diagrams associate to the representation of colour81
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: 4.4.2 Class Diagram4.4.2.1 Class Di
Page 23 and 24: SearchColoursobserverilluminantL_va
Page 25 and 26: CompareColourscolourEncodingsIllumi
Page 27 and 28: InterfaceImportColourgetName ()getD
Page 29: 4.5 SummaryUse case driven object-o

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