XVIIIth Congress: XVIIIth Congress

kraus, karl; waldhäusl, peter

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Multivolume work

Persistent identifier:: 1667435949

Title:: XVIIIth Congress

Sub title:: Vienna, Austria 1996

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667435949

Language:: English

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1667437070

Title:: XVIIIth Congress

Scope:: 230 Seiten

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667437070

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(31,B1)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist anhand des Copyrightjahrs ermittelt.

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: THERMAL-VISUAL DIGITAL SYSTEM IN THE IMAGE OF AREA PHENOMENA Andrzej Lubecki, Bogustaw Wiecek

Document type:: Multivolume work

Structure type:: Chapter

THERMAL-VISUAL DIGITAL SYSTEM IN THE IMAGE OF AREA PHENOMENA Andrzej Lubecki*, Bogustaw Wiecek** * Chair of Photogrammetry and Remote Sensing Olsztyn Uniwersity of Agriculture and Technology-Poland **Institute of Elektronics Technical University of Lódz-Poland Commision |, Working group 3 KEY WORDS: Thermal camera, CCD, Computer, Image, Infrared, Remote sensing. ABSTRACT Thermal-vision digital system (TVDS) was worked out on the basis of a thermal scanner of AGEMA LWB 880 and vi- sion camera CCD. The scanner obtains data in spectrum range 8-12 um and the camera CCD in the range 0,4- 0,9 um. The aim of the system is to register digital data on surface temperatures distribution and their measurements on the examined objects. Generated thermal and visual images are stored in the computer memory IBM notebook type and processed on one monitor in parallel. The systemcan work on different stands in a laboratory, in a car while driving or in a plane during a flight. TVDS may register thermal images, visual images or both of them: a) as single i- mages, b) as films with given time intervals between registration of particular records, C) in real-time. The registered digital images undergo elaboration taking into account surrounding temperature, emission coefficient and registration distance (atmospheric conditions). The elaboration of thermograms can be carried out in TVDS or outside it. There is a possibility of elaborations in different forms: qualitative or quantitative ones. Graphic image has got a screen form which can be a layer of a vector map. TVDS is an open system and therefore it can be equipped with necessary ad- ditional applications. 1. STRUCTURE, FUNCTIONING AND SOFTWARE TVDS The interface of camera is an essential element of a computer system of processing thermographic images where analog signal carrying information concerning the temperature of an object which is changed into digital form and sent to a computer. The possibility of recipro- cal matching of thermal and optical images was applied for faster and easier interpretation of thermograms. The- refore the system was equipped with two cameras: thermal and CCD visual ones. The methods of pro- cessing the images concern both thermal and optical parts. However, they differ as far as different amount of information in both images is concerned. Vin Fig.1. Operation of interface in the thermal camera dia- gram 116 The optical systems of both cameras have got similar parameters and software runs in Windows 3.1 and a computer notebook type-fig.1. The thermal camera AGEMA LWB 880 is an electromechanical device where the process of the image analysis takes placedue to ro- tation of prisms and mirrors. The rate of image genera- tion by the camera is low because rotational speed of the scaning system is limited. A low rezolution data a- cquiring system is recommended. Typically, resolution of 256 pixels/line is quite acceptable. As a result of this re- solution the data transmission rate (from camera to the computer) does not exceed hundreds Kbytes per se- cond. Synchronization system, where sampling clock signal is produced, is a very important element of the interface. It is the signal with much higher frequency than horizontal HSYNC and vertikal VSYNC deflection frequency. Accuracy of reproduction of sampling clock influences the thermal image being transmitted to a computer(Wiecek, B. 1993) Another important element of TVDS is an optical inter- face of CCD camera. The computer interface of the CCD camera is equipped with large butter memory because of the sizeof optical inages. It enables to store one or few full images. The elements of preliminary digital conversion can be additionaly found in the buffer memo- ry. The image transmitted to the computer is of high stability and quality as the contrast, emission coefficient or environmental conditions are concerned. The interfa- ce of the optical camera is presented in picture 2. High power of interface conversion results from high calcula- tion power of optikal image processor and the possibility of availability to many image pixels. Low speed informa- tion exchange through transmission circuits is limitation of image conversion. Monochrome CCD camera intefa- ce contains 16-bit graphic processor dedicated for complex video operations. International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996 Fig.2 TVS- AGE real- 50m real- 160r non real- non 5. Tr 6. Ne 5. Li 6. Vi 7.8

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