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Geometric stability and lens decentering in compact digital cameras
Enoc Sanz-Ablanedo1, José Ramón Rodríguez-Pérez, Julia Armesto
1Geomatics Engineering Research Group, University of León, Avda. Astorga s/n, 24400 Ponferrada, Spain. esana@unileon.es
Sensors (Basel, Switzerland)
|February 2, 2012
Summary
This study analyzed geometric stability and lens decentering in compact digital cameras. Findings reveal how these factors impact camera precision and quality, offering practical photogrammetric use recommendations.
Area of Science:
- Photogrammetry and Geomatics
- Optical Engineering
- Digital Imaging
Background:
- Compact digital cameras are increasingly used in photogrammetry.
- Understanding sensor-lens system stability is crucial for accurate geometric measurements.
- Lens decentering can introduce significant distortions affecting image quality.
Purpose of the Study:
- To assess the geometric stability of internal camera parameters.
- To quantify lens decentering and its relationship with camera precision.
- To provide practical guidelines for using compact cameras in photogrammetry.
Main Methods:
- Conducted 372 calibration processes across six identical compact digital cameras.
- Evaluated internal geometry variations (principal distance, principal point, distortion) under various conditions.
- Analyzed radial and tangential displacements due to lens decentering.
- Performed additional calibrations to study geometry changes during camera rotation.
Main Results:
- Variations in internal geometry parameters were quantified.
- Lens decentering was correlated with camera precision and principal point offset.
- Camera operational states (continuous use, power cycling, zoom) and rotation influenced geometric stability.
- Significant relationships were found between stability, decentering, and obtainable precision.
Conclusions:
- Geometric stability and lens decentering are key determinants of compact camera precision in photogrammetric applications.
- Camera usage patterns and rotation significantly affect internal geometry.
- Recommendations are provided to optimize photogrammetric data acquisition with these devices.
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