Laboratory calibration and characterization of video cameras

The Pulnix TM6CN CCD camera ( Figure 1) appears to be a suitable choice for many close range photogrammetric applications where the cost of the final system is a factor. The reasons for this are: its small size, low power consumption, pixel clock output, variable electronic shutter, and relatively high resolution. However, to have any confidence in such a camera a thorough examination is required to assess its characteristics. In this paper an investigation of three of these cameras is described, and their suitability for close range photogrammetry evaluated. The main factors assessed are system component influences, warm-up effects, line jitter, principal point location and lens calibration. The influence of the frame-store on the use of the camera is also estimated and where possible excluded. Results of using these cameras for close range measurement are given and analysed. While many users will have or prefer to buy other cameras, the evaluation of this particular camera should give an understanding of the important features of such image sensors, their use in photogrammetric measuring systems and the processes of evaluating their physical properties.

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“…The system at City University has been successfully applied to a wide variety of engineering applications. 9. REFERENCES.…”

Section: Discussionmentioning

confidence: 98%

<title>Suitability of the Pulnix TM6CN CCD camera for photogrammetric measurement</title>

1993

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“…To examine the accuracy of camera calibration, one can compare the calculated camera orientation and lens distortion parameters with more accurate values obtainedusing other independent techniques (that are too time consuming or difcult to implement in large production wind tunnels). The aforementioned optimization method for camera calibration has been compared against the optical techniques described by Burner et al 25 and Burner. 26 The optical techniques may be more accurate, but require special laboratory equipment that may not be available or may be unsuitable for on-site calibration.…”

Section: Uncertaintymentioning

confidence: 99%

Videogrammetric Model Deformation Measurement Technique

Burner

Liu

2001

Journal of Aircraft

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The theory, methods, and applications of the videogrammetric model deformation (VMD) measurement technique used at NASA for wind-tunnel testing are presented. The VMD technique, based on nontopographic photogrammetry, can determine static and dynamic aeroelastic deformation and attitude of a wind-tunnel model. Hardware of the system includes a video-rate charge-coupled device camera, a computer with an image acquisition frame grabber board, illumination lights, and retrore ective or painted targets on a wind-tunnel model. Custom software includes routines for image acquisition, target-tracking/identi cation, target centroid calculation, camera calibration, and deformation calculations. Applications of the VMD technique at ve large NASA wind tunnels are discussed.

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“…This technique does not provide an estimation of the principal distance, nor of the principal point offsets. However, other work reported by Robson et al (1993), based on the work of Burner et al (1990), has shown that the principal point offsets and their standard deviations can be determined for each camera relatively easily and used as a priori values in a subsequent bundle adjustment. (b) Test field calibration.…”

Section: Camera Calibrationmentioning

confidence: 99%

Automated Three Dimensional Measurement Using Multiple CCD Camera Views

Clarke

Cooper

Chen

et al. 1995

The Photogrammetric Record

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The goal of automated three dimensional measurement of arbitrary objects using photogrammetric methods is a long way from being achieved, but significant progress is being made. However, automated measurement of small objects using inexpensive CCD cameras and frame grabbers is becoming increasingly common. A number of such systems have been developed both for commercial use and for academic research. It is within this latter context that a system to measure objects within a controlled environment has been developed at City University. The objective of the research is not only to produce a flexible measuring system for use in online inspection, but also to address many of the fundamental problems that hinder three dimensional measurement outside a controlled environment.

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Laboratory calibration and characterization of video cameras

Cited by 10 publications

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<title>Suitability of the Pulnix TM6CN CCD camera for photogrammetric measurement</title>

<title>Suitability of the Pulnix TM6CN CCD camera for photogrammetric measurement</title>

Videogrammetric Model Deformation Measurement Technique

Automated Three Dimensional Measurement Using Multiple CCD Camera Views

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