标题：SELECTION OF MATERIALS FOR THE DEVELOPMENT OF PASSIVE CALIBRATION TARGETS AND THE METHODOLOGY USED IN DETERMINING THE SPATIAL RESOLUTION OF THERMAL CAMERAS AND SCANNERS
其他标题：DOBÓR MATERIAàÓW DO WYTWORZENIA PASYWNYCH CELÓW KALIBRACYJNYCH ORAZ METODYKA WYZNACZANIA TERENOWEJ ZDOLNOĝCI ROZDZIELCZEJ KAMER I SKANERÓW TERMALNYCH
期刊名称：Archiwum Fotogrametrii, Kartografii i Teledetekcji
印刷版ISSN：2083-2214
出版年度：2008
卷号：18
语种：English
出版社：Main Board of Association of Polish Surveyors
摘要：Precise determination of the resolving power of thermal sensors is of a key importance when acquiring imagery from the air. The resolving power defines the value of such imagery in many applications. The paper describes possibilities of determining the resolving power of thermal sensors based on especially designed calibration tests. The existing thermal calibration targets are presented. The paper describes and analyses two basic methods of determining the resolving power based on calibration targets: a subjective method of multiple observations and an objective method,which uses the modulation transfer function (MTF). The existing passive thermal targets used by international Open Skies Treaty groups were analysed. The targets,which comply to the rigorous requirements of the Treaty,are usually made of large metal panels,which makes them difficult to transport. Therefore research is in progress on the selection of adequate materials for the production of calibration targets. In the experimental section,a large array of materials such as textiles as well as panels made out of wood,steel and aluminium of different finishes and covered with paints of different emissivities,were examined in the thermal range. Analysis of the authors' own measurements as well as those taken by Open Skies groups allows to conclude that the use of textiles is the most convenient solution for developing a thermal calibration target. Such a target is easy to transport and very convenient to experiment with in the field. Furthermore,development of such a target is simple and does not require any complex, specialised production methods. Calibration targets used by the Open Skies Treaty members make it possible to only subjectively establish the flight altitude,for which the resolving power of the sensor will not exceed 40,50 or 60cm. They do not,however,allow to determine the resolving power of the sensor for any given flight altitude. The paper presents also an objective method for determining the resolving power of thermal sensors for any flight altitude based on the modulation transfer function used on two textile targets: a Siemmens star and slanted edge test.
其他摘要：Precyzyjne wyznaczenie terenowej zdolnoĞci rozdzielczej sensorów termalnych jest problemem niezwykle istotnym przy pozyskiwaniu zobrazowaĔ z puáapu lotniczego. Artykuá przedstawia moĪliwoĞci wyznaczania terenowej zdolnoĞci rozdzielczej sensorów termalnych
