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Close-range photogrammetry applied to the documentation of cultural heritage using telescopic and wide-angle lenses

机译:使用望远镜和广角镜将近距离摄影测量法应用于文化遗产文献

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Close-range photogrammetry is widely used for numerically and graphically representing historical buildings for documentation. Such data can be later used as the base for conservation and restoration processes. The highest precision in point determination in photogrammetry can be achieved using a metric camera, although it is expensive. Recently, many studies have used SLR non-metric cameras, which have the advantage of a self-calibration method and furthermore, are cheaper than the metric camera. In most cases, for close-range photogrammetry applications that use an SLR digital camera, the object is close to the camera (less than 50 m), requiring a wide-angle setting. In our study, the precision achieved is based on a compact camera (Lumix TZ-10) used in building restitution. We experimented with the two extremes in close-range photogrammetry: close object, less than 15 m between the camera lens and to building fagade; and distant object, up to 200 m between camera lens and building. In both cases, the precision achieved was suitable for the restitution of the historical buildings: under 1 cm for near objects using a 25-mm wide-angle lens and 3 cm for the distant object using a 280-mm telescopic lens. We achieved remarkable precision in the case of the tele lens, where it is unusual to use the focal length for building restitution in close-range photogrammetry. Nevertheless, a tele lens becomes necessary when it is not possible to place the camera near the object, as in the case of the northern fagade of the Alhambra in Granada, Spain.
机译:近距离摄影测量法广泛用于以数字和图形方式表示历史建筑物,以进行记录。这样的数据以后可以用作保护和恢复过程的基础。尽管价格昂贵,但可以使用公制相机在摄影测量中确定点的最高精度。近来,许多研究已经使用了SLR非公制相机,该相机具有自校准方法的优点,而且比公制相机便宜。在大多数情况下,对于使用SLR数码相机的近距离摄影测量应用,对象靠近相机(小于50 m),需要进行广角设置。在我们的研究中,所获得的精度基于用于建筑物修复的紧凑型相机(Lumix TZ-10)。我们在近距离摄影测量中对两个极端进行了实验:近距离物体,距离相机镜头与建筑物立面之间的距离小于15 m;和远处的物体,摄像机镜头与建筑物之间的最大距离为200 m。在这两种情况下,所达到的精度都适用于恢复历史建筑物:使用25毫米广角镜对近距离物体的距离小于1厘米,使用280毫米伸缩镜对远处物体的距离小于3厘米。在远摄镜头的情况下,我们获得了卓越的精度,在近距离摄影测量中,通常不使用焦距来恢复建筑物。但是,在无法将相机放置在物体附近的情况下,如西班牙格拉纳达的阿尔罕布拉宫的北立面的情况下,需要使用望远镜头。

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