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In medicine and cosmetics a need has arisen for an accurate, fast, simple and broadly applicable three-dimensional skin surface measuring system. A new development of such handheld optical device that uses white light Fourier transform profilometry for skin surface topography measurement is presented here. The device is based on a commercially available DSLR camera and a newly designed optical system which projects a Ronchi grating pattern on the measured surface and records its image. The 3D surface is reconstructed from a single image. The topography is described using four surface roughness parameters: mean absolute deviation Rsuba , root-mean-square deviation Rsubq skewness Rsubsk and kurtosis Rsubku . Experimental measurements were conducted on five facial skin areas, together belonging to three people, before and after the laser skin treatment therapy, to evaluate its effects on skin surface roughness. The results show the viability and usefulness of the developed optical system for skin topography measurement. V članku je predstavljena nova ročna optična naprava, ki uporablja Fourierjevo transformacijsko profilometrijo z belo svetlobo za merjenje topografije kože. V medicini in kozmetiki se pojavlja potreba po natančnem, hitrem, enostavnem in široko uporabnem sistemu za tridimenzionalno in-vivo merjenje površine kože. Taka optična naprava bi dajala natančne in konsistentne informacije o topografiji in barvi kože, pri čemer bi bilo brezdotično in neinvazivno merjenje globine njena najpomembnejša novost. |
