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3D Imaging and Analysis of Depth/Range Images, IEE Colloquium on

Date 1 Mar 1994

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Displaying Results 1 - 11 of 11
  • On the use of 3D scanning and surface matching to locate patients undergoing radiotherapy planning and treatment

    Publication Year: 1994 , Page(s): 11/1 - 11/8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    The authors discuss the methods and applications used to capture three dimensional (3D) surface representations of the human body. They present a 3D data acquisition system based on a IBM compatible computer running under Microsoft Windows 3.1. They focus on the proposed application of the system in patient repositioning during radiotherapy treatment. Patients undergoing radiotherapy treatment undergo a series of `simulation studies' prior to the actual treatment. These studies are done to decide what machine settings to use when the treatment is applied. The position of the high energy photon beam relative to the treatment area is critical. The orientation of the this beam can be incorrect if the patient's 3D position relative to the treatment machine is not in agreement with his or her position relative to the simulator used during simulation studies. The system proposed addresses this issue. They conclude with an evaluation of such a system and how it might assist in the provision of a high quality radiotherapy service View full abstract»

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  • Acquisition of CAD models from multiple range views

    Publication Year: 1994 , Page(s): 8/1 - 8/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (232 KB)  

    The project reported focuses on the automatic acquisition of CAD-like models of industrial components from multiple range images. The models are intended to be suitable firstly for use in industrial vision applications such as object inspection, location and recognition. Another potential exploitation of such models is for use in reverse engineering tasks View full abstract»

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  • 3D measurement using stereo scene coding

    Publication Year: 1994 , Page(s): 3/1 - 3/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (244 KB)  

    This paper outlines the hardware and software developments that have resulted from the active stereo probe (ASP) project's investigation into 3D surface recovery using structured pattern projection. Scene objects are illuminated by patterns projected by the ASP active illumination projection system (AIPS). Images of the patterns, disrupted by the scene, are then captured using the ASP stereo camera head and analysed using a technique called Stereo Scene Coding (SSC) to recover 3D information. Recent, post ASP work has concentrated on viewpoint integration to facilitate complete object modeling View full abstract»

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  • High-accuracy 3-D measurement using multiple camera views

    Publication Year: 1994 , Page(s): 1/1 - 1/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    A method which has not received high prominence in the machine vision community is that of multi-camera measurement. There are advantages to be gained from using multi-camera views: (i) redundancy of measurement; (ii) statistical feedback; (iii) full modelling of all parameters; (iv) mature understanding of the method; (v) wide acceptance of the technique; and (vi) known performance. Against these advantages are: (i) the high level of computation; (ii) the setting up for each measurement case; (iii) a high degree of `expert knowledge' required; (iv) the lack of techniques for fast or dynamic automated measurement. This paper describes the basic method of photogrammetry and discusses the potential for automated high accuracy measurement in an industrial context View full abstract»

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  • Topology and deformable surfaces

    Publication Year: 1994 , Page(s): 9/1 - 9/3
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (148 KB)  

    The author introduced a new representation for deformable surfaces based on a fine-grained union of patches. This representation has the potential to take on an arbitrary topology in a data driven way. It is an elegant and simple representation, with a clear geometrical interpretation View full abstract»

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  • Real-time tracking of surfaces with structured light

    Publication Year: 1994 , Page(s): 5/1 - 5/4
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    At Oxford University much research has recently been focused on active vision, and in particular dynamic contours. These deformable model curves are able to track objects in an image using dynamic models of the behaviour of the target which can be learnt over time. It seems natural to extend these methodologies to investigate the problem of measuring surfaces (rather than contours) undergoing motion. The range sensor developed by the authors allows them to measure moving scenes, by requiring just a single image to measure depth unambiguously even in the presence of occlusion. By acquiring range data at frame rates from the sensor, they can develop real time 3D surface trackers. Their work looks at several key areas of dynamic model based tracking. The aim is to apply this to the tracking of a flexing hand. Already the surface contour is capable of tracking continuous surfaces in real time, such as a piece of paper as it flexes View full abstract»

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  • Integration of non-contact inspection with modelling of engineering components

    Publication Year: 1994 , Page(s): 6/1 - 6/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    In recent years the industry has been experiencing rapidly increasing demands for reduced product development time and improved product quality, particularly in relation to the production of complex components. This trend has resulted in the need to perform accurate and rapid dimensional measurements on complex shapes and to integrate inspection with the design and manufacturing processes. This paper presents the main results of the research performed at Imperial College under BRITE 2415 project. The work is embodied in the development of TrueForm, a software package, for integration of modelling and inspection of complex components View full abstract»

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  • Reverse engineering in industrial applications using laser stripe triangulation

    Publication Year: 1994 , Page(s): 4/1 - 4/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (208 KB)  

    In many fields of industry it is necessary to obtain shape information from physical objects. The diversity of items which need to be measured is huge but their shape properties can be broadly classified into two categories: regular, consisting of planes, cylinders and so on, or free-form, where the surface shape is considerably more complex to describe. The two most common uses of surface shape information are for inspection, that is the comparison of the object geometry against the nominal size, or for reverse engineering, the determination of the object geometry where no nominal data exists. This paper presents a system for the reverse engineering of free-form surfaces for industrial applications View full abstract»

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  • Fusion of intensity and range data

    Publication Year: 1994 , Page(s): 7/1 - 710
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (352 KB)  

    Recent work to improve the robustness of computer vision has included investigation of sensor fusion. The authors introduce a visual architecture, which has several parallel processes operating in a reconfigurable, concurrent architecture. It consists of a conventional, intensity based image interpretation system and the corresponding depth channel. Each route may be implemented as a cascade of parallel processes, each of which has been implemented on a processor farm. However, the architecture exhibits the potential for fusion at the pixel, primitive and matching levels. In order to control the several processes and to determine at which, if any, level fusion should occur, it is necessary to include a control process or processes, with explicit goals of object identification and location, as a pre-process for manipulation or inspection. They concentrate on studies of the three levels of fusion of depth and intensity data of a scene acquired from a single viewpoint View full abstract»

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  • IEE Colloquium on `3D Imaging and Analysis of Depth/Range Images' (Digest No.1994/054)

    Publication Year: 1994
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (64 KB)  

    The following topics were dealt with: 3D measurement using multiple camera views; stereo scene coding; reverse engineering in industrial applications using laser stripe triangulation; real-time tracking of surfaces with structured light; noncontact inspection and engineering components modelling; intensity and range data fusion; CAD models acquisition; and topology and deformable surfaces View full abstract»

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  • The scanning and three dimensional reconstruction of facial features

    Publication Year: 1994 , Page(s): 10/1 - 10/3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (232 KB)  

    The results obtained thus far concentrate on the essential low level processing of the digitised data tackling the problem of poor contrast images and the task of reliably extracting the 3D depth information using dedicated image processing algorithms. This has enabled much of the data analysis to be automatic, rendering the technique far more viable in a clinical environment. A non-invasive and inexpensive facial scanning system has been developed to enable presurgical analysis, in conjunction with x-ray data, and especially long term post-surgical monitoring. The data capture time is insignificant and the proposed level of accuracy adequate. As such, the technique is extremely versatile and can also be applied to other body surfaces and hence a variety of other medical applications. All the algorithms discussed have been implemented on a standard personal computer with the view to eventual widespread use in hospitals and clinics View full abstract»

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