Vpliv zunanjih dejavnikov na kontaktno merjenje barve človeške kože. (Slovenian)

Human skin is a complex and unpredictable organ. Its colour can be objectively evaluated by using the colour measurement methods. The results of the measurements are affected by many factors, the impacts of which are not fully defined as yet. Certain factors directly determining the colour of the skin are dependent upon the individual and cannot be controlled. The emphasis of the research was on the second group of factors that refer to the measurement conditions and are variable and adaptable. The aim of the research was to examine the impact o f the number of consecutive measurements, the selection of a body part, location of the selected area within a specific part of the body, the size of the measuring aperture, and the temperature on skin colour. The appropriateness of the instruments and repeatability of the results were also assessed, depending on the number of consecutive measurements and the selected size of the measuring aperture. The measurements were performed using two different reflectance spectrophotometers with the participation of a total of 6 volunteers. Within the measurements, the above-mentioned conditions were gradually changed and the results were given in the form of reflection values, CIEL*a*b* coordinates, colour difference ΔE* ab lightness difference ΔL*, chroma difference ΔC* ab and hue difference ΔH * ab with in the CIELAB colour space. All of the examined factors were proved to have major impacts on the results of the measurements of skin colour. The results showed that performing 10 successive measurements at one point is sufficient for good repeatability. In order to achieve high repeatability be advised against selecting a small measuring aperture. Specifically defining the part of the body and the individual points of measurement is recommended depending on the purpose of the measurement and maintaining such an ambient temperature so as to avoid hampering the normal temperature of the skin's surface. [ABSTRACT FROM AUTHOR]

Človeška koža je kompleksen in nepredvidljiv organ, katerega barva se na področju znanosti objektivno vrednoti z uporabo barvne metrike. Na rezultate merjenja vplivajo številni dejavniki, ki še niso v celoti opredeljeni. Nekateri dejavniki neposredno določajo barvo kože, so odvisni od posameznika ter jih ne moremo nadzorovati. Poudarek raziskave pa je bil na drugi skupini dejavnikov, ki se nanašajo na pogoje merjenja in so spremenljivi in prilagodljivi. Tako je bil namen raziskave proučiti vpliv števila zaporednih meritev, izbora dela telesa, lokacije točke v določenem delu telesa, velikosti merilne odprtine ter temperature na barvo kože. Ocenjeni sta bili tudi primernost uporabljenih instrumentov in ponovljivost rezultatov merjenja v odvisnosti od števila zaporednih meritev ter izbrane velikosti merilne odprtine. Meritve so bile izvedene z dvema različnima refleksijskima spektrofotometroma, sodelovalo pa je skupaj šest prostovoljcev. V okviru meritev so bili omenjeni pogoji načrtno spreminjani, rezultati pa so bili podani v obliki refleksijskih spektrov, CIEL*a*b* koordinat, barvnih razlik ΔE* ab , sprememb svetlosti ΔL*, sprememb nasičenosti ΔC* ab ter sprememb barvnegatona ΔH* ab v barvnem prostoru CIELAB. Vsi proučevani dejavniki so izkazali velik vpliv na rezultate merjenjabarve kože. V raziskavi je bilo ugotovljeno, da za dobro ponovljivost rezultatov merjenja zadošča deset zaporednih meritev v eni točki. Odsvetovana je uporaba najmanjših merilnih odprtin, ker te ne omogočajo dovolj visoke ponovljivosti. Priporočena sta tudi natančno definiranje dela telesa in posameznih točk merjenja v odvisnosti od namena in vzdrževanje take temperature okolja, ki čim manj moti normalno temperaturo površine kože. [ABSTRACT FROM AUTHOR]

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