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SMALL & MEDIUM FORMAT DIGITAL CAMERA SPECIFICATIONS ...

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APPENDIX B<br />

<strong>CAMERA</strong> CALIBRATION AND STABILITY ANALYSIS: TECHNICAL BACKGROUND<br />

(b)<br />

Side<br />

View<br />

Distortion-free Points using IOPII<br />

Figure 7 – Original and distortion-free image points (a), and<br />

distortion-free bundles using IOP sets derived from two calibration<br />

sessions (b).<br />

R (ω, φ, κ)<br />

c1<br />

P.C.I<br />

Original Image Points<br />

Distortion-free Points using IOPI<br />

P.C. (0, 0, 0)<br />

pI (xI, yI,-cI)<br />

pII (xII, yII,-cII)<br />

Figure 8 – Conceptual basis of bundle comparison for stability analysis.<br />

14.4 Total System Calibration (in-situ)<br />

Spatial<br />

Offset<br />

Optical and indoor camera calibration procedures are designed to derive<br />

the internal characteristics of the imaging system (IOP) within<br />

controlled environments. However, there might be a possibility that the<br />

estimated parameters from an indoor camera calibration exercise are<br />

different from those estimated through an in-situ calibration under<br />

operational conditions. Therefore, it is always recommended to carry out<br />

an in-situ camera calibration to evaluate the differences, if any,<br />

between estimated IOP from in-situ and indoor calibration procedures.<br />

The discussed evaluation measures in the previous section can be used to<br />

quantify the differences between these IOP sets.<br />

Printed copy of this document is uncontrolled. For latest version see<br />

Specifications for Small and Medium Format Digital Cameras posted at _____<br />

Owner: BMGS Title: Specifications for Small and Medium Format<br />

Digital Cameras<br />

Version No: DRAFT V0.0.11 Issue Date: _______________<br />

Doc No.: __________________ ARCS/ORCS: ________________<br />

29<br />

c2<br />

P.C.II<br />

Bundle I<br />

Bundle II

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