{"id":1075,"date":"2020-06-04T10:50:27","date_gmt":"2020-06-04T08:50:27","guid":{"rendered":"http:\/\/calldrone.fr\/?page_id=1075"},"modified":"2022-10-13T21:55:56","modified_gmt":"2022-10-13T19:55:56","slug":"photogrammetrie","status":"publish","type":"page","link":"https:\/\/calldrone.fr\/?page_id=1075","title":{"rendered":"Photogramm\u00e9trie"},"content":{"rendered":"
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La photogramm\u00e9trie<\/h2>\n <\/div>\n <\/div>\n
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Avec cette technique, vous collecterez un maximum d’informations vous permettant d’obtenir des mesures pr\u00e9cises, des altitudes ou des hauteurs, ainsi que des volumes \u00e0 l’\u00e9chelle, et d’en reproduire le contenu en 3D.<\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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C\u2019est une technique de <\/span>scan 3D par photographie<\/strong>.<\/span><\/p>\n

Datant de 1849, ce proc\u00e9d\u00e9 a v\u00e9ritablement pris son envol dans l\u2019industrie ces derni\u00e8res ann\u00e9es gr\u00e2ce aux \u00e9volutions technologiques.<\/span><\/p>\n

La photogramm\u00e9trie permet de retranscrire des objets ou des environnements r\u00e9els de fa\u00e7on virtuelle<\/strong>. Par le biais de nombreuses photographies, des algorithmes vont se baser sur les pixels communs de toutes les images pour reconna\u00eetre la g\u00e9om\u00e9trie de l\u2019espace.<\/span><\/p>\n

Il est donc possible de repr\u00e9senter num\u00e9riquement une ville enti\u00e8re, une montagne ou bien encore un stylo. Toutes les possibilit\u00e9s sont envisageables.<\/span><\/p>\n

D\u00e9finissons les 5 \u00e9tapes cl\u00e9s du processus de photogramm\u00e9trie.<\/span><\/p>\n

La prise de photo<\/u><\/strong><\/p>\n

La premi\u00e8re \u00e9tape consiste \u00e0 photographier l\u2019objet \u00e0 scanner sous tous les angles possibles. Selon les besoins et la taille, le nombre de clich\u00e9s peut varier facilement entre 50 et plus de 2000 prises.<\/span><\/p>\n

La correspondance des images<\/u><\/strong><\/p>\n

Ensuite, de puissants algorithmes pr\u00e9sents dans les logiciels de photogramm\u00e9trie retrouvent les pixels communs de chaque photo. Ainsi, le logiciel analyse et retrouve les points caract\u00e9ristiques de chaque image lui permettant de mettre en relation les diff\u00e9rentes prises de vues.<\/span><\/p>\n

Le nuage de points<\/u><\/strong><\/p>\n

Une fois tous les pixels communs retrouv\u00e9s, l\u2019ordinateur analyse les images pixel par pixel pour d\u00e9duire leur position dans un espace virtuelle. Ce qui g\u00e9n\u00e8re un nuage de points partiellement repr\u00e9sentatif de l\u2019objet ou l\u2019environnement original.<\/span><\/p>\n

Le maillage<\/u><\/strong><\/p>\n

Cette \u00e9tape consiste \u00e0 relier tous les points entre eux afin de former des triangles (on appelle \u00e7a la triangulation). Cela permet de cr\u00e9er la surface de l\u2019objet et d\u2019obtenir un r\u00e9sultat d\u00e9j\u00e0 plus concret.<\/span><\/p>\n

La texture<\/u><\/strong><\/p>\n

Une fois le maillage r\u00e9alis\u00e9, il est possible de r\u00e9utiliser les diff\u00e9rentes photos et ainsi les plaquer sur l\u2019objet 3D. Ce choix permet une reconstitution fid\u00e8le et r\u00e9aliste puisqu\u2019il reprend parfaitement les \u00e9l\u00e9ments de vos prises de vues comme les couleurs ou les mati\u00e8res.<\/span><\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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Nos r\u00e9alisations<\/h2>\n <\/div>\n <\/div>\n
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Voici quelques exemples de nuages de points qui ont \u00e9t\u00e9 r\u00e9alis\u00e9s pour nos clients.\n
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