3D Recording: Structure from Motion

First steps.  October 2017

Structure from motion is a photogrammetric range imaging technique for estimating three-dimensional structures from two-dimensional image sequences.  Here are my first attempts.







Twisted Camper van.  The result of my first ever photogrammetry attempt – could do better! 

Using my mobile phone I took sets of photographs in three arcs (low, high, higher) around the van.  This was the result using no masks and processing in Agisoft Photoscan.  It looks more like a piece of abstract art!  Here’s an earlier version I processed in Autodesk software


If at first you don’t succeed, fail better!









Small Peruvian Figurine.  She’s a bit patchy in places

Photographs were taken with a canon slr camera on manual setting. (CR2 files). Camera static, mounted on tripod. Camera on manual, f-stop 7.1, shutter speed 1/400  , iso 800

Object placed on turntable, within homemade photobox. Natural daylight, dull day.

First image taken of light box – before the object is placed.  This allows the software to automatically create a mask of the object for each image.

2 arcs of photos taken (lower and higher) at 30 degree intervals around object.  Use of zoom avoided.

Processing in Agisoft

Step 1. Upload images to Agisoft.  On review of images one image was deleted because it was darker than others and at a different angle

Step 2. Align photos.  In first attempt (on default settings) ca 30% of the images didn’t align.

I repeated this step, selecting these settings and all the photos aligned (green ticks).  However, inspection of the sparse cloud showed that a number of images aligned incorrectly – at the front of the model, instead of at the back of the model.

Step 3. Build dense cloud

Step 4. Build mesh