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Sensors 2015, 15(4), 7823-7843; doi:10.3390/s150407823

A Novel Multi-Digital Camera System Based on Tilt-Shift Photography Technology

1,†,* , 2,†,* , 2
,
2
and
3
1
Key Laboratory of Technology in Geo-spatial Information Processing and Application System, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
2
National Engineering Research Center for Geo-informatics, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
3
State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100101, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Fabrizio Lamberti
Received: 12 December 2014 / Revised: 22 March 2015 / Accepted: 25 March 2015 / Published: 31 March 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [3628 KB, uploaded 31 March 2015]   |  

Abstract

Multi-digital camera systems (MDCS) are constantly being improved to meet the increasing requirement of high-resolution spatial data. This study identifies the insufficiencies of traditional MDCSs and proposes a new category MDCS based on tilt-shift photography to improve ability of the MDCS to acquire high-accuracy spatial data. A prototype system, including two or four tilt-shift cameras (TSC, camera model: Nikon D90), is developed to validate the feasibility and correctness of proposed MDCS. Similar to the cameras of traditional MDCSs, calibration is also essential for TSC of new MDCS. The study constructs indoor control fields and proposes appropriate calibration methods for TSC, including digital distortion model (DDM) approach and two-step calibrated strategy. The characteristics of TSC are analyzed in detail via a calibration experiment; for example, the edge distortion of TSC. Finally, the ability of the new MDCS to acquire high-accuracy spatial data is verified through flight experiments. The results of flight experiments illustrate that geo-position accuracy of prototype system achieves 0.3 m at a flight height of 800 m, and spatial resolution of 0.15 m. In addition, results of the comparison between the traditional (MADC II) and proposed MDCS demonstrate that the latter (0.3 m) provides spatial data with higher accuracy than the former (only 0.6 m) under the same conditions. We also take the attitude that using higher accuracy TSC in the new MDCS should further improve the accuracy of the photogrammetry senior product. View Full-Text
Keywords: remote sensing and sensors; geometric calibration; tilt-shift photography; multi-digital camera system remote sensing and sensors; geometric calibration; tilt-shift photography; multi-digital camera system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sun, T.; Fang, J.-Y.; Zhao, D.; Liu, X.; Tong, Q.-X. A Novel Multi-Digital Camera System Based on Tilt-Shift Photography Technology. Sensors 2015, 15, 7823-7843.

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