Practical Influences of Geometric and Radiometric Image Quality Provided By Different Digital Camera Systems

Robson, Stuart; Shortis, Mark R.

doi:10.1111/0031-868x.00123

Cited by 17 publications

(9 citation statements)

References 16 publications

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“…There are many potential sources of systematic error which may contribute to the disparity between relative accuracy and relative precision. The primary potential sources which have been identified are calibration stability (Shortis and Beyer, 1997), variation of distortion (Fraser and Shortis, 1992;, unflatness of the CCD array , perspective distortion of targets (Dold, 1996) and optical aberrations (Robson and Shortis, 1998), to name just a few. This paper investigates the specific issues of calibration stability and behaviour of the principal point location for Kodak DCS series cameras.…”

Section: Introductionmentioning

confidence: 99%

Principal Point Behaviour and Calibration Parameter Models for Kodak DCS Cameras

Shortis

Robson

Beyer³

1998

The Photogrammetric Record

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Digital still cameras have been widely adopted for close range photogrammetry and machine vision applications. Due to the advantages of onboard storage of digital images, portability and rapid data processing, digital still cameras are rapidly becoming standard equipment for measurement tasks such as industrial metrology and heritage recording. As for any metric application, the accuracy of the derived object data is dependent, amongst many other factors, on the accuracy of the camera calibration. For the vast majority of photogrammetric applications, use of the simple case of a block invariant calibration model comprising the primary physical parameters, including the principal point position, is sufficient. However, cameras designed for photojournalism and domestic use, such as the Kodak DCS420 and 460 cameras, are well known for their calibration instability because the design is based on a 35 mm SLR camera body. In particular, previous research has shown that the principal point location is prone to movement during normal handling of the camera, due to the mounting mechanism of the CCD array. This paper reports on an investigation of the physical behaviour of the principal point location and compares different calibration parameter models for the Kodak DCS420 and DCS460 digital still cameras.

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Section: Introductionmentioning

confidence: 99%

Principal Point Behaviour and Calibration Parameter Models for Kodak DCS Cameras

Shortis

Robson

Beyer³

1998

The Photogrammetric Record

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“…The work described in this paper builds upon and reinforces the research recently described in Robson and Shortis 1998. For this paper imagery was captured using a single Kodak MegaPlus 1 .61 camera body incorporating a Nikon F bayonet lens mount.…”

Section: Practical Evaluation Of Retro-target Image Qualitymentioning

confidence: 78%

<title>Vision metrology with superwide-angle and fish-eye optics</title>

1998

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Photogrammetrists have generally made use of wide or super wide angle rectilinear lenses that are designed to reproduce straight lines in the object space as straight lines in the image space. This paper investigates the use of fish-eye optics as an alternative to the conventional super wide-angle lens for vision metrology. The fish-eye design, whilst still retro-focus in construction, rejects the design constraints of rectilinear imaging in exchange for more even illumination across the image format and the expectation of reduced lens aberration effects. By means of a series of practical comparisons, this paper will investigate the target image performance and practical usage of two off-the-shelf 35mm camera mount lenses, namely an 18mm focal length super wide-angle rectilinear lens and a 16mm quasi fish-eye lens. Investigations include: an image quality assessment of retro-target images of differing sizes; an analysis of the variation in retro-target image quality with lens aperture; the influence of the different lenses on the internal consistency of highly over-determined self-calibrating multi-station photogrammetric networks and; an accuracy test between networks obtained with each lens type against measurement of the same targets using an industrial theodolite system.

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“…"The increasing importance of data quality verification has been brought about by the ability of digital camera systems and retrotargeting methods to produce high quality spatial data in a userfriendly manner under a wide variety of industrial and engineering applications" (Robson & Shortis, 1998). A critical element that must be faced is the risk of spreading 3D models whose quality is not controlled or certified and thus they could be used, now or in future, inappropriately.…”

Section: The Importance Of Data Quality Assessmentmentioning

confidence: 99%

Evaluation of Photogrammetric Block Orientation Using Quality Descriptors From Statistically Filtered Tie Points

Calantropio

Deseilligny²,

Rinaudo

et al. 2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Due to the increasing number of low-cost sensors, widely accessible on the market, and because of the supposed granted correctness of the semi-automatic workflow for 3D reconstruction, highly implemented in the recent commercial software, more and more users operate nowadays without following the rigorousness of classical photogrammetric methods. This behaviour often naively leads to 3D products that lacks metric quality assessment. This paper proposes and analyses an approach that gives the users the possibility to preserve the trustworthiness of the metric information inherent in the 3D model, without sacrificing the automation offered by modern photogrammetry software. At the beginning, the importance of Data Quality Assessment is outlined, together with some recall of photogrammetry best practices. With the purpose of guiding the user through a correct pipeline for a certified 3D model reconstruction, an operative workflow is proposed, focusing on the first part of the object reconstruction steps (tie-points extraction, camera calibration, and relative orientation). A new GUI (Graphical User Interface) developed for the open source MicMac suite is then presented, and a sample dataset is used for the evaluation of the photogrammetric block orientation using statistically obtained quality descriptors. The results and the future directions are then presented and discussed.

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Practical Influences of Geometric and Radiometric Image Quality Provided By Different Digital Camera Systems

Cited by 17 publications

References 16 publications

Principal Point Behaviour and Calibration Parameter Models for Kodak DCS Cameras

Principal Point Behaviour and Calibration Parameter Models for Kodak DCS Cameras

<title>Vision metrology with superwide-angle and fish-eye optics</title>

Evaluation of Photogrammetric Block Orientation Using Quality Descriptors From Statistically Filtered Tie Points

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