Abstract
Abstract. Non-metric digital cameras are being widely used for photogrammetric studies. The increase in resolution and quality of images obtained by non-metric cameras, allows to use it in low-cost UAV and terrestrial photogrammetry. Imagery acquired with non-metric cameras can be used in 3D modeling of objects or landscapes, reconstructing of historical sites, generating digital elevation models (DTM), orthophotos, or in the assessment of accidents. Non-metric digital camcorders are characterized by instability and ignorance of the interior orientation parameters. Therefore, the use of these devices requires prior calibration. Calibration research was conducted using non-metric camera, different calibration tests and various software. The first part of the paper contains a brief theoretical introduction including the basic definitions, like the construction of non-metric cameras or description of different optical distortions. The second part of the paper contains cameras calibration process, details of the calibration methods and models that have been used. Sony Nex 5 camera calibration has been done using software: Image Master Calib, Matlab - Camera Calibrator application and Agisoft Lens. For the study 2D test fields has been used. As a part of the research a comparative analysis of the results have been done.
Highlights
The most common and most frequently used in the Unnmaned Aerial Systems (UAS) are compact digital cameras
Measurement of fiducial marks associated with the principal point is impossible, because they do not occur in images taken by the non-metric digital camera
Self-calibration is the process of camera calibration performed during the measurement process
Summary
The most common and most frequently used in the Unnmaned Aerial Systems (UAS) are compact digital cameras (non-metric cameras). Metric cameras are able to guarantee the stability of the internal orientation elements. These cameras do not have the possibility of zoom lens. Non-metric cameras are characterized by instability and ignorance of the elements of internal orientation. The viewfinder is placed above the lens, causing the phenomenon of parallax These cameras have a much smaller matrices than an SLR or hybrids . There is only one lens, which is used at the same time to observe the frame and exposures The advantage of this type of camera is to give the frame in the form in which they will be exposed. Digital camera consists of elements such as: body, bayonet lens, image sensor, LCD display, memory card.
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