XVIIIth Congress: XVIIIth Congress

kraus, karl; waldhäusl, peter

Bibliographic data

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:: CALIBRATION OF DIGITAL IMAGES PRODUCED WITH THE USE OF UMAX 1200 SE SCANNER Adam Boron

Document type:: Multivolume work

Structure type:: Chapter

CALIBRATION OF DIGITAL IMAGES PRODUCED WITH THE USE OF UMAX 1200 SE SCANNER Adam Boron Dr. Eng., The Department of Photogrammetry and Remote Sensing Informatics University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraköw, Poland Commission |, Working Group 5 KEY WORDS: Scanner, Calibration, Pixel, Pattern, Accuracy, Digital Image ABSTRACT As a result of the analysis of geometric deformations of digital images acquired using low cost scanner UMAX 1200 SE, the correction method is proposed which reduces scanning geometric errors from m, = +5 pixels to mp = +0.15 pixels = +3 um. The correction is executed in two stages. In the first stage are determined l-order corrections d,, dy, being steady for each point of the scanner plate and determined during precalibration process. Next are determined d, correction of ll-order, being variable for each scanner run, but on certain digital image being constant along the sensor line and changeable for different sensor line position. 1. INTRODUCTION Digital photogrammetry deals with processing of photo- grammetric photos, as well as semi-metric and non- metric images given in a digital form. One of the method of gaining the digital images is scanning the original photo using different scanner type. Scanner which are used to gain the digital image for digital photogrammetry purposes should be characterised by the following feature: - high optical resolution, - scanning in passing light, - sufficient scanning field size (min.23x23 cm - typical aerial photo size), - scanning black and white as well as colour photos, - possibility of scanning of a photo made on glass plate, and - high geometrical similarity of a digital image to a original photo. The scanners which fulfil all above mentioned conditions are very expensive. On market there are also available scanners used in printing (designed for printing purpo- ses), which are more cheaper. Some technical parame- ters like: resolution and size meet the requirements of digital photogrammetry but the geometrical quality is significantly lower. The UMAX 1200 SE is such type of scanner, which is in possession of Department of Photo- grammetry and Remote Sensing Informatics, University of Mining and Metallurgy, Cracow. The goal of this paper is to describe the methodology of scanner accuracy testing, to present the results achieved and to propose method of geometric calibration of scanned images with their accuracy description. 2. RECORDING AND MEASUREMENT OF TESTED DIGITAL IMAGES The UMAX 1200 SE scanner, used to gain digital images for testing it's geometric accuracy, is a flat type scanner. The scanning in a reflected light is possible for a size 210x300 mm (A4), while in a passing light (for negatives 20 and diapositives) is possible for a size 150x220 mm. The maximal optical resolution along Y axis (according with movement direction of a bar composed of CCD elements) equals 1200 dpi while in X direction 600 dpi (5000 CCD elements located on a bar, 210 mm long). Thus a smallest optical pixel size in Y direction equals 0,02mm, while in X direction 0,04mm. The maximal software scanner resolution is 2400x2400 dpi. It means that if decreasing of the pixel size take place, the pixel value is interpolated from values of recorded optical pixels. Testing the scanning errors was performed for the full scanner size (150x220mm) in a passing light. Such size make possible to scan 70% of typical air photo size 23x23 cm. For stereoscoping processing, when only 60% of area of each stereo-pair photo is used, such area of a scanned photo is sufficient. To conduct a geometric calibration of the scanner a special pattern was designed and made. The pattern is composed of 368 main crosses of size 5x5x0,1mm regularly distributed in 10mm intervals and grouped in 16 columns and 23 rows. Between the crosses located in columns 1,2, 8,15 and 16, for further grid densification, additional 110 small crosses (size 1x1x0,1mm) were located. For the pattern design a programme COREL was used. Then the pattern was visualised with resolution 2400 dpi on LINOTRONIC. The fragment of the pattern is shown on Fig.1. Pie mt Fig.1. Fragment of the ideal pattern International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996 The pe stereo +3um. ideal s digital The pe size 0, optima Video : pattern resolut Scanni minute descril scanni withou allowe causec transp: being | To elit were e scanni pattern patterr workin to rest pattern The st repeat During scanne Z. Dur A...lin and in The re measu thousa (pixels autom W.Tro progra the er VSD & image. coordii the dic corner matior For ea 352 cr an enl positio 3.TI To det the sc patter! tion) f and fu pixels) given deforn

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