Phototriangulation Using CCD Camera in Close‐Range Environment

Abstract

The steady decrease in cost of a digital camera and frame grabber, together with higher resolution will result in more photogrammetric applications using such a camera. This is because of the advantages of speed and automation in image acquisition and measurement. In this paper, a standard frame‐transfer charged‐coupled device (CCD) camera was used to acquire close‐range digital images for phototriangulation. Its accuracy in determining three‐dimensional coordinates of premarked targets was compared with values derived from the conventional surveying method of triangulation. Two image‐processing techniques, image correlation and moment preservation, were utilized to measure premarked targets interactively on a computer monitor.