Performance Evaluation of a 33 Megapixel Alpa 12 Medium Format Camera for Digital Close Range Photogrammetry
نویسنده
چکیده
The accuracy of object reconstruction was tested with two medium format cameras made by ALPA of Switzerland. Both cameras have been equipped with a 33 megapixel Leaf Aptus 75 digital camera back and a 47 mm focal length Schneider Apo-Digitar lens. The first test was carried out with the lens in “normal” position. In the second test, the principal point of another Apo-Digitar lens type was decentred by a fixed amount of approximately 8 mm. Decentring the principal point of a lens can be of advantage for terrestrial applications. Both cameras reveal large accuracy of object reconstruction, checked against calibrated scale bars in a test field (according to VDI/VDE Guideline 2634). The accuracy of object reconstruction of the camera system with the decentred lens does not reach the same level as for the “normal” camera. * Corresponding author.
منابع مشابه
Performance of Medium Format Digital Aerial Sensor Systems
Dealing with digital airborne photogrammetric data acquisition today’s main focus is quite often exclusively laid on the large format digital sensor systems like ADS40 (Leica Geosystems), DMC (ZI-Imaging) and UltracamD (Vexcel Austria) which are already used in practice now. Their advantages are well known, nonetheless, for smaller area projects the use of such large format systems might be ine...
متن کاملResults of a Performance Test of a Dual Mid-format Digital Camera System
The low weight and the relatively low cost of medium format digital cameras have pushed the use of those units for aerial survey. These medium format cameras are often used as secondary sensors together with other aerial sensors like LiDAR systems. The rising number of pixels per camera leads to an increasing interest in medium format systems as main sensors, especially for smaller survey aircr...
متن کاملMedium-format Digital Cameras: a Study into Their Calibration, Stability Analysis, and Integration with High Resolution Satellite Imagery
Photogrammetry provides spatial and descriptive information from imagery that can be used in countless applications, including ortho-image production, map creation, construction planning, and military reconnaissance. The type of cameras traditionally used for these various applications were large format analog cameras. In recent years, however, the use of digital cameras for photogrammetric pur...
متن کاملDGPF-Project: Evaluation of Digital Photogrammetric Camera Systems - Geometric Performance
The geometric performance of digital airborne cameras also including the impact of direct sensor orientation has been evaluated by a test of the German Society of Photogrammetry, Remote Sensing and Geoinformation (DGPF). This test includes following airborne photogrammetric cameras: the large format frame cameras Z/I Imaging DMC, Vexcel Imaging UltraCamX and the line scanning camera system Leic...
متن کاملExtended Lens Model Calibration of Digital Still Cameras
Digital still cameras have been widely adopted for close range photogrammetry and machine vision applications. Due to the advantages of on board storage of digital images, portability and rapid data processing, digital still cameras have virtually replaced medium format film cameras for measurement tasks such as structural monitoring and industrial metrology. As for any photogrammetric applicat...
متن کامل