Calibration of comparators and digitizers without nominal grid values as control data

B. Wrobel; W. Lin; Chr. Busch

doi:10.1117/12.2294286

1 August 1990 Calibration of comparators and digitizers without nominal grid values as control data

B. Wrobel, W. Lin, Chr. Busch

Proceedings Volume 1395, Close-Range Photogrammetry Meets Machine Vision; 139517 (1990) https://doi.org/10.1117/12.2294286
Event: Close-Range Photogrammetry Meets Machine Vision, 1990, Zurich, Switzerland

Abstract

The calibration of comparators (or analytical plotters or digitizers) very often is achieved by means of a reseau of points on glass or film (grid plate) situated in contact with the measuring field of the comparator. From two sets of information the calibration data normally are deter- mined: from the comparator measurements of the reseau points and from their given control data. The procurement of high precision control data is costly. We, therefore, have developed the so far used procedure into one with only very few control data or even without any control data (= free selfcalibration). By choice of the size of the reseau and the density of marks the degree of calibration may be properly fixed. The new procedures have been successfully tested at the analytical plotter WILD AC 1 with results of high accuracy.

Citation Download Citation

B. Wrobel, W. Lin, and Chr. Busch "Calibration of comparators and digitizers without nominal grid values as control data", Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 139517 (1 August 1990); https://doi.org/10.1117/12.2294286

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