دانلود رایگان مقاله بازسازی 3D ابرهای سیروس تروپوسفری

Abstract

In this paper, we present a series of results from stereo-imagery of cirrus clouds in the troposphere. These clouds are either of natural origin or are created by aircraft exhausts. They are presently considered to be a major cause for the climate change. Two observation campaigns were conducted in France in 2013 and 2014. The observing sites were located in Marnay (47°17′31.5″ N, 5°44′58.8″ E; altitude 275 m) and in Mont Poupet (46°58′31.5″ N, 5°52′22.7″ E; altitude 600 m). The distance between both sites was 36 km. We used numeric CMOS photographic cameras. The image processing sequence included a contrast enhancement and a perspective inversion to obtain a satellite-type view. Finally, the triangulation procedure was used in an area that is a common part of both fields of view.

6. Conclusion In this paper, we discussed the problem of 3D reconstruction using photometric and geometric methods of a stereoscopic system for tropospheric cirrus clouds. The important point of this work is to develop an original method for stereo-imaging based on the matching of two images of the same object acquired in two different sites. For the matching of the two images, we calculate for each pair of points, a parameter called ZNCC (Zero mean Normalized Cross-Correlation) or the coefficient of the zero mean sum of squares of differences called ZSSD. Our work allowed us to characterize and to perform measurements on structures diffuse with no well-defined contour. Regarding the application, we used two cameras Canon 400D. The images were taken also in the mode vis-a`-vis two sites located in Franche-Comte´: Mont Poupet and Marnay. We characterized the type ‘‘cirrus” clouds that are formed in the upper troposphere. Clouds play an important role in the mechanisms of climate. In addition, artifi- cial cirrus clouds are created by the contrails of aircraft, and add a significant contribution to the processes of air pollution.