Báo cáo lâm nghiệp: "A digital photographic method for 3D reconstruction of standing tree shape"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: A digital photographic method for 3D reconstruction of standing tree shape. | Ann. For. Sci. 64 2007 631-637 INRA EDP Sciences 2007 DOI forest 2007041 Available online at Original article A digital photographic method for 3D reconstruction of standing tree shape Adrian Ilie HAPCAa Frédéric M0THEb Jean-Michel LEBANb a Centre for Timber Engineering Napier University Merchiston Campus Edinburgh EH10 5DT Scotland b INRA - Centre de Recherches de Nancy Laboratoire d Étude des Ressources Forêt-Bois 54280 Champenoux France Received 15 June 2006 accepted 15 February 2007 Abstract - A digital photographic method is presented which is able to reconstruct the profile of the stem on standing trees up to a height of 12 m and to provide a fine level of detail. The method uses two digital photographs taken at 90 to each other and does not require special illumination conditions. A method is proposed to perform the data acquisition process from the two photographs and to transform the stem dimensions and 3-D position from pixels to units of length. The accuracy of this method for measuring tree shape was tested by comparing the results with those obtained from a laser system. The comparison showed that the photographic method provides a good assessment of standing tree shape. 3D profile standing trees digital camera photogrammetry Picea abies Résumé - Mesure de la forme des arbres sur pied par photogrammétrie. La méthode photographique présentée dans cet article permet la reconstruction en 3D du profil du tronc d arbres sur pied jusqu à une hauteur de 12 m. On utilise un appareil photo numérique pour faire deux prises de vue orientées à 90 l une de l autre. Il n y a pas de contrainte particulière d éclairage. Le traitement des images conduit à la representation tridimension-nelle des tiges et à la mesure des indicateurs de forme. La précision de la méthode proposée est évaluée par référence à des mesures réalisées avec un théodolite à visée laser. Les résultats montrent que la méthode photographique permet des mesures précises de

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