Structure from Motion
Structure from Motion (SfM) is a photogrammetric range imaging technique for estimating three-dimensional structures from two-dimensional image sequences that may be coupled with local motion signals. It is studied in the fields of computer vision and visual perception. In biological vision, SfM refers to the phenomenon by which humans (and other living creatures) can recover 3D structure from the projected 2D (retinal) motion field of a moving object or scene.
Humans perceive a lot of information about the three-dimensional structure in their environment by moving around it. When the observer moves, objects around them move different amounts depending on their distance from the observer. This is known as motion parallax, and from this depth information can be used to generate an accurate 3D representation of the world around them.
Finding structure from motion presents a similar problem to finding structure from stereo vision. In both instances, the correspondence between images and the reconstruction of 3D object needs to be found.
To find correspondence between images, features such as corner points (edges with gradients in multiple directions) are tracked from one image to the next. One of the most widely used feature detectors is the scale-invariant feature transform (SIFT). It uses the maxima from a difference-of-Gaussians (DOG) pyramid as features. The first step in SIFT is finding a dominant gradient direction. To make it rotation-invariant, the descriptor is rotated to fit this orientation. Another common feature detector is the SURF (speeded-up robust features). In SURF, the DOG is replaced with a Hessian matrix-based blob detector. Also, instead of evaluating the gradient histograms, SURF computes for the sums of gradient components and the sums of their absolute values. Its usage of integral images allows the features to be detected extremely quickly with high detection rate. Therefore, comparing to SIFT, SURF is a faster feature detector with drawback of less accuracy in feature positions. Another type of feature recently made practical for structure from motion are general curves (e.g., locally an edge with gradients in one direction), part of a technology known as "Pointless" SfM, useful when point features are insufficient, common in man-made environments.
Sometimes some of the matched features are incorrectly matched. This is why the matches should also be filtered. RANSAC (random sample consensus) is the algorithm that is usually used to remove the outlier correspondences. In the paper of Fischler and Bolles, RANSAC is used to solve the location determination problem (LDP), where the objective is to determine the points in space that project onto an image into a set of landmarks with known locations.
The feature trajectories over time are then used to reconstruct their 3D positions and the camera's motion. An alternative is given by so-called direct approaches, where geometric information (3D structure and camera motion) is directly estimated from the images, without intermediate abstraction to features or corners.
There are several approaches to structure from motion. In incremental SFM, camera poses are solved for and added one by one to the collection. In global SFM , the poses of all cameras are solved for at the same time. A somewhat intermediate approach is out-of-core SFM, where several partial reconstructions are computed that are then integrated into a global solution.
Structure from Motion photogrammetry with multi-view stereo provides hyperscale landform models using images acquired from a range of digital cameras and optionally a network of ground control points. The technique is not limited in temporal frequency and can provide point cloud data comparable in density and accuracy to those generated by terrestrial and airborne laser scanning at a fraction of the cost.. Structure from motion is also useful in remote or rugged environments where terrestrial laser scanning is limited by equipment portability and airborne laser scanning is limited by terrain roughness causing loss of data and image foreshortening. The technique has been applied in many settings such as rivers, badlands, sandy coastlines, fault zones, landslides, and coral reef settings. SfM has been also successfully applied for the assessment of large wood accumulation volume and porosity in fluvial systems, as well as for the characterization of rock masses through the determination of some properties as the orientation, persistence, etc. of discontinuities. A full range of digital cameras can be utilized, including digital SLR's, compact digital cameras and even smart phones. Generally though, higher accuracy data will be achieved with more expensive cameras, which include lenses of higher optical quality. The technique therefore offers exciting opportunities to characterize surface topography in unprecedented detail and, with multi-temporal data, to detect elevation, position and volumetric changes that are symptomatic of earth surface processes. Structure from Motion can be placed in the context of other digital surveying methods.
Cultural heritage is present everywhere. Its structural control, documentation and conservation is one of humanity's main duties (UNESCO). Under this point of view, SfM is used in order to properly estimate situations as well as planning and maintenance efforts and costs, control and restoration. Because serious constraints often exist connected to the accessibility of the site and impossibility to install invasive surveying pillars that did not permit the use of traditional surveying routines (like total stations), SfM provides a non-invasive approach for the structure, without the direct interaction between the structure and any operator. The use is accurate as only qualitative considerations are needed. It is fast enough to respond to the monument’s immediate management needs. The first operational phase is an accurate preparation of the photogrammetric surveying where is established the relation between best distance from the object, focal length, the ground sampling distance (GSD) and the sensor’s resolution. With this information the programmed photographic acquisitions must be made using vertical overlapping of at least 60% (figure 02).
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Structure from motion software toolboxes
Open source solutions
- Trying all the free Photogrammetry-Tools
- Bundler – Structure from Motion for Unordered Photo Collections by Noah Snavely
- openMVG An Open Multiple View Geometry library + Structure from Motion demonstrators
- openMVS Multi-View Reconstruction Software
- Libmv – A Structure from Motion library
- Theia: A Fast and scalable structure-from-motion library released under the BSD license
- COLMAP: General-purpose Structure-from-Motion pipeline with a graphical and command-line interface, licensed under the GPL.
- MicMac, a SFM open-source code released by the Institut national de l'information géographique et forestière
- LSD-SLAM: Large-Scale Direct Monocular SLAM in real-time, by Jakob Engel
- MVE – The Multi-View Environment by Simon Fuhrmann, TU Darmstadt.
- ceres-solver for general non-linear least squares. Has features for bundle adjustment. Previously used by Google internally for google maps. Released to the public in 2012.
- SBA for generic bundle adjustment by Manolis Lourakis.
- SFMToolkit a complete photogrammetry solution based on open-source software
- AliceVision an open-source (MPLv2) Photogrammetric Computer Vision Framework (SfM+MVS)
- Structure from Motion toolbox for Matlab by Vincent Rabaud
- Matlab Functions for Multiple View Geometry by Andrew Zissermann
- Structure and Motion Toolkit by Phil Torr
- Matlab Code for Non-Rigid Structure from Motion by Lorenzo Torresani
- Python Photogrammetry Toolbox GUI – an open-source SFM GUI (Easy SfM and dense point cloud estimation launcher) by Pierre Moulon and Arc-Team
- OpenSfM, a Structure from Motion library written in Python on top of OpenCV, used by Mapillary, Simplified BSD License.
- Catena Python Abstract Workflow Framework with SfM components.
Closed source software
- Agisoft Photoscan, a photogrammetry solution by Agisoft integrating SfM and ground control. Supports editing/classifying, batch operations, Python scripting, and import/export other formats.
- RealityCapture, a photogrammetry solution by Capturing Reality that can process images and/or laser-scans automatically. It can also export SFM to bundle.out and other formats.
- Smart3DCapture, a complete photogrammetry solution by Acute3D.
- 3DF Samantha – Command line structure from Motion pipeline for Windows, by 3Dflow srl. Free for non-commercial purposes.
- 3DF Zephyr, a photogrammetry solution by 3Dflow srl, based on 3DF Samantha.
- Automatic Camera Tracking System (ACTS), a structure-from-motion with dense depth recovery system for Microsoft Windows, by Vision Group of State Key Lab of CAD&CG, Zhejiang University.
- Large-Scale Automatic Camera Tracking System (LS-ACTS), a large-scale structure-from-motion system for Microsoft Windows, by Vision Group of State Key Lab of CAD&CG, Zhejiang University.
- VisualSFM: A Visual Structure from Motion System, by Changchang Wu
- MountainsMap SEM software for Scanning Electron Microscopes. 3D is obtained by tilting the specimen + photogrammetry.
- Voodoo Camera Tracker, non-commercial tool for the integration of virtual and real scenes.
Original site, archived: Laboratorium für Informationstechnologie, University of Hannover
- MetaIO Toolbox SfM for augmented reality on mobile devices.
- TacitView by 2d3 Sensing
- CMPMVS Multi-View Reconstruction Software
- University of Stuttgart's LibTSgm library
- pfalkingham (2016-09-14). "Trying all the free Photogrammetry!". Dr Peter L. Falkingham. Retrieved 2017-05-16.