Tag Archives: automatic

More lost blog posts: Arc de Triomphe

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L’Arc de Triomphe

Re-posted here are some of the images collected this past summer of the Arc de Triomphe in Paris. These were made as a sort of demo project following some training sessions in which I was learning how to create rich 3D point clouds from photographs.

Axonometric view of point cloud

Looking at these images now, they don’t seem terribly “rich” as 3D point clouds – I’ve since learned how to do this work  better – but they are a good start. For one thing, they were the successful resolution of an automatic analysis module ( a big time saver).

“RCP” of point cloud

Individual photos with point measurements shown

Screen shot from Elcovision

Reclining Figure Arch Leg – Sculpture by Henry Moore 1973

Reclining Figure Arch Leg – by Henry Moore 1973

This summer (2010) marks the real debut of a reliable automatic generation of dense point clouds by using photogrammetry.  I travelled to Switzerland in July and gave this exciting new software module a try on something that would be a real challenge to document in anyway other way – a sculpture by Henry Moore.

The four panels below show different views of the point cloud generated from these photographs. For me the real lesson in this study is that objects to be documented in this way need to be photographed in conditions that produce as even lighting as possible. One can see that some of the reflectiveness from the metal (brass) surface of the sculpture resulted in less-dense-than-desired regions in the point cloud. Still, I was excited to see how well it performed under what I now understand to be relatively harsh conditions.

The density of these point clouds is considerably higher than what photogrammetry ordinarily would produce while not being the hard-to-manage overkill produced by laser scans. what’s more, these point clouds can be enriched with the same type of smart point clouds that provide a meaningful link to both rectified photography and architectural description.