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：Terrestrial laser scanning is becoming increasingly widely used in those fields in which it is necessary to obtain fast and precise measurements of complex objects. The essence of the laser scanner function is the measurement of a large quantity of points located in close proximity of each other. The measurement takes place owing to the use of a laser with a defined wavelength and a rotating mirror,by means of which the laser radiation can be pointed in any direction around the instrument. The automated measurement of angles and distances allows determination of spatial coordinates of the measured points of the object. Scanner measurements result in the so-called “point cloud” which usually consists of a few million points. Each of these points possesses very precisely determined spatial coordinates X,Y,Z. Apart from the spatial coordinates,each point contains information about its reflection intensity. This information has many applications,but it has to be borne in mind that it refers only to a very narrow radiation band,equal to the laser wavelength,e.g.,for the Leica ScanStation2 the laser is green. Additional,very useful information can be found on digital images,acquired by inbuilt digital cameras. However,the electromagnetic spectrum considered is still in the visible range. The paper presents a possibility of using imagery acquired by means of external sensors (not integrated with the scanner). Imagery acquired with a thermal camera,which represents the temperature distribution of the given object,has been deemed most useful. Thermal images, properly acquired and processed to a unified temperature scale,are placed onto a three dimensional model of the object to create a 3D thermal model. The objective of the paper was to present a connection between laser scanning data and thermal imagery. As a result,a point cloud of the objects surface is obtained. Each point,apart from its X,Y,Z coordinates,includes information about its temperature. This greatly broadens the existing range of applications of laser scanning,as measurements and analyses of inaccessible objects or those posing hazard to humans can be carried out, Doubtless,the advantages of laser scanning combined with the possibility of acquiring images representing spatial distribution of the temperature of the object,greatly broaden the existing range of applications. Novel application include,i.a.,aiding the design of new installations,e.g.,those sensitive to external thermal conditions. It seems that surveys of technical conditions and wearing rate of installations and other types of industrial objects could be completed with the thermal model much faster and more accurately than by using separate thermograms. By combining thermal images with laser scanning data it is possible to not only read the temperature at any given point of the image,but also to take measurements of length and area.
其他摘要：Przedmiotem artykuáu jest poáączenie danych ze skaningu laserowego ze zobrazowaniami termalnymi. Obiektem badaĔ wykorzystanym w eksperymencie byá monitor komputerowy LG Flatron F900P. Do pozyskania danych przestrzennych wykorzystano skaner laserowy Leica
关键词：laser scanning;thermal images;texture mapping;3D;thermal model
