eprintid: 10100714
rev_number: 8
eprint_status: archive
userid: 695
dir: disk0/10/10/07/14
datestamp: 2020-06-12 10:58:14
lastmod: 2020-06-12 10:58:14
status_changed: 2020-06-12 10:58:14
type: thesis
metadata_visibility: show
creators_name: Huang, Yi Dong
title: Three dimensional measurement based on theodolite-CCD cameras
ispublished: unpub
keywords: Earth sciences; Theodolite-CCD cameras
note: Thesis digitised by ProQuest.
abstract: This thesis concerns the investigation of the fundamental problems of three dimensional measurement using the theodolite-CCD camera, which is formed by attaching a CCD camera rigidly to the telescope of a theodolite. A novel method – the camera-on-theodolite method – is proposed for the calibration of the theodolite-CCD camera. This method is also applicable to the calibration of any other cameras that can be mounted on the telescope of a theodolite. The most significant advantage of this method over previous ones is the dispensability of control target fields. The effectiveness of the method is proved with both simulation and experiments. Computer software is produced for implementing the new method in routine CCD camera calibration and is proved by experiments to be efficient. Algorithms are designed and computer programs produced for automatic location of circular target images to subpixel accuracy. The algorithms involve parabolic interpolation of gradients at edge points of target images followed by least squares fitting of the edges with ellipse. The accuracy of target image location achieved by the algorithms is assessed using three methods developed by the author and is found to be as high as 1/50 pixel. One of the most important measuring functions of theodolite-CCD cameras – theodolite scanning photogrammetry – is investigated in which a long focus lens is used to take images at large scale serially in grid form to cover the measured object. It is shown with experiments that this function can either improve the accuracy of CCD cameras in object coordinate determination for a specified object coverage or increase the object coverage of the CCD cameras for a specified accuracy in object coordinate determination.
date: 1994
oa_status: green
full_text_type: other
thesis_class: doctoral_open
thesis_award: Ph.D
language: eng
thesis_view: UCL_Thesis
primo: open
primo_central: open_green
verified: verified_manual
full_text_status: public
pages: 115
institution: UCL (University College London)
department: Photogrammetry and Surveying
thesis_type: Doctoral
citation:        Huang, Yi Dong;      (1994)    Three dimensional measurement based on theodolite-CCD cameras.                   Doctoral thesis  (Ph.D), UCL (University College London).     Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10100714/1/Three_dimensional_measurement_.pdf