Digital orthophoto is an image where the relief displacements and the camera's tilt have been removed. So it is an efficient, inexpensive and accurate approach for purposes such as evaluation, analysis or measurement of the objects presented in the images. For this reason digital orthophoto has occupied an important place in spatial database in GIS. The traditional orthophoto is based on Digita...

Vehicle crush measurements have typically been done using either offset methods or punctual survey methods such as with a total station or using photogrammetry. While offset grid methods are functional in determining 2-D displacement along the x and y-axis, vertical movement along the z-axis is much harder to achieve. Using a total station to complete crush measurements around a vehicle can yie...

The following paper describes a novel data acquisition system for machine vision aided harvesting, which can also be used to provide data for various different applications. The system consists of two cameras and a projector. The basis for the operation is to project a pattern of structured light onto a target. By synchronous operation of the projector and the cameras, a dataset of imaged patte...

In this paper, a robust recognition algorithm for encoded targets in close-range photogrammetry is proposed. Firstly, Canny detector is used to detect edges from an input image. Secondly, the least squares method is employed to fit ellipses to the set of data points yielded by the edge detector. Three restriction criteria based on length, shape, and embedding are applied to restrict the set of ...

Deformation monitoring is an important procedure of measuring the structural health of completed civil engineering structures. Most traditional methods for measuring deflection occurring in structures require periodic access for designated inspectors to the particular area being monitored. As a remote sensing technique, photogrammetry does not need any contact with the objects of interest, and ...

In last decade, we have witnessed an increased number of publications related to systems that combine laser scanning and closerange photogrammetry technologies in order to address the challenges posed by application fields as diverse as industrial, automotive, space exploration and cultural heritage to name a few. The need to integrate those technologies is driven by resolution, accuracy, speed...

This paper describes the use of photogrammetry to measure and quantify ice accretion on an aerofoil section. A series of stereoscopic photographs was taken during the ice accretion on the section in an icing tunnel. From measurements made on these photographs with a Kern (Leica) DSR 14 analytical photogrammetric plotter, a series of three dimensional models of the ice surfaces was constructed. ...

This paper describes the use of digital photogrammetry for measurement of deflections in concrete beams during destructive testing. A two-video camera system was used to measure vertical deflections with a precision of ±0.25mm (1σ). The system, network design and processing methods are described in detail. Results are presented from several tests of different types of beams. Some of the advanta...

Unbaked earth structures, like adobe structures are found in abundance throughout the world. Like most structures, they are subject to deterioration through time. The preservation of historic adobe structures requires careful attention and evaluation of several factors, but material erosion is the main concern. In order to calculate the amount of erosion, accurate measurement of the structures ...