Abstract
During the last year amateur low‐cost digital cameras are increasingly expected to contribute to the digital photogrammetry. An important aspect of the suitability of these cameras is determination of their geometrical instability. In order to evaluate amateur digital camera performance, small format, low resolution and low-cost CCD camera have been investigated in two considerations: determining inner orientation parameters at different time and estimating accuracy in test field experiments. The calibration results demonstrate the poor stability of such a digital camera. As a result of the instability, amateur cameras have limited possibilities in close-range photogrammetry. However, the investigated camera under certain limited accuracy requirements can be used for low-accuracy photogrammetric application.
Highlights
For the last three decades the development of analytical photogrammetry has allowed the extensive use of non-metric cameras for image acquisition
It is expected that amateur digital cameras can be widely used in photogrammetric field as an essential tool, which is able to advance traditional photogrammetric application
Investigation of camera inner orientation parameters instability shows that it varies about 30–50 pixels
Summary
For the last three decades the development of analytical photogrammetry has allowed the extensive use of non-metric (amateur) cameras for image acquisition. Present-day digital technology can provide nonmetric images by using digital amateur cameras that are relatively widely employed in close-range photogrammetry. The development of a low-cost photogrammetric system using amateur digital camera is one of the important tasks for the non-topographic photogrammetry. Mobile phones with high resolution CCD sensor are appearing at present In these circumstances, various applications of amateur digital cameras (with more than 3 mega pixels) for digital photogrammetric field and incorporating them with telecommunications equipment can be expected. The drawbacks in the use of small format amateur cameras (non-metric imagery) are the lack of fiducial marks, unknown and instable inner orientation parameters. In order to evaluate an amateur digital camera from the point of view of digital photogrammetic application the instability of inner orientation parameters as well as the performance evaluation of amateur, small format and low-cost CCD camera have been investigated
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