20.500.12556/DiRROS-7422 Umerjanje objektiva "ribje oko" za fotografijo hemisfere Fotografija hemisfere je v gozdoslovnih raziskavah ena najprimernejših metod za ocenjevanje poprečij sončnega sevanja skozi daljša obdobja. Metoda temelji na uporabi skrajno širokokotnih objektivov ribje oko, ki so znani po velikih popačitvah preslikav. Prvi pogoj za uporabo metode je poznavanje preslikave za kombinacijo fotoaparata in objektiva. Značilnosti preslikave pridobimo s postopkom umerjanja. V prvem delu prispevka opisujemo postopek umerjanja objektiva ribje oko za ocenjevanje sončnega sevanja v gozdoslovnih raziskavah.V drugem delu predstavljamo rezultate umerjanja objektiva ribje oko proizvajalca Sigma 8 mm, f/4 (MF, N), ki ga uporabljamo v kombinaciji s fotoaparatom Nikon F50. Hemispherical photography represents one of the most appropriate methods of estimating averages of solar radiation over extended periods of time. This method is based upon the use of extremely wide-angle fisheye lenses, which produce large projection distortion. To correctly interpret hemispherical photography we have to know the projection characteristics of the fisheye lensin combination with a camera body. This can be achieved through lens calibration. The first part of the article explains in detail the calibration method for fisheye lenses which are used to assess the solar radiation in forest ecology research. In the second part the results of calibration for fisheye lens Sigma8 mm, f/4 (MF, N) are presented. The lens was used on a Nikon F50 camera body. sončno sevanje meritve sevanja gojenje gozda ocenjevanje sevanja objektiv ribje oko umerjanje objektiva fotografija hemisfere pretok energije gozd fotografija hemisfera solar radiation radiation measurement silviculture photosynthesis photosynthetically active radiation photosynthetically usable radiation fisheye lens calibration of lens assessment of radiation true false false Slovenski jezik Angleški jezik Neznano 2017-07-12 09:14:25 2017-07-12 09:14:25 2022-08-12 13:45:39 0000-00-00 00:00:00 2000 0 0 str. 5-25 Vol. 61 2000 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630 0351-3114 URN:NBN:SI:doc-6VI8PBDY 677542 6206978 zbgl-61-1.pdf zbgl-61-1.pdf 1 450B892854E7C6DB98F50B3F4699E95C 39d3cb75b40dca8635cf117080370153477a9c09b6e75c3ca6bf7e0fde175840 0e1b334b-17b5-11ed-b6b8-001a4af901a5 20.500.12556/dirros/1a73b2b3-12eb-4504-a6ae-b36a8f72808d https://dirros.openscience.si/Dokument.php?lang=slv&id=9272 Gozdarski inštitut Slovenije Acta Silvae et Ligni 0 0 0