How It Works – PhotoModeler’s SmartMatch and DSM

How and When to use PhotoModeler's SmartMatch Methods

​​The SmartMatch and DSM (Dense Surface Modeling) tools are used to automatically detect and match features across multiple overlapping photos. The result is a dense point cloud that can optionally be triangulated/surfaced to form the shape. Projects built with DSM tools can be supplemented with traditional modeling features, such as points and lines.

Appropriate Subjects | Photography | Examples | Tools to Use | Other Resources

Appropriate subjects

The appropriate subjects for SmartMatch and DSM projects are those with natural random 'texture' like the objects shown in these images. Then PhotoModeler Premium's SmartMatch and DSM tools can be used to build dense point clouds, with or without photo-textured surfacing/triangulation.

How It Works – PhotoModeler’s SmartMatch and DSM 1
How It Works – PhotoModeler’s SmartMatch and DSM 2
How It Works – PhotoModeler’s SmartMatch and DSM 3
How It Works – PhotoModeler’s SmartMatch and DSM 4
How It Works – PhotoModeler’s SmartMatch and DSM 5
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How It Works – PhotoModeler’s SmartMatch and DSM 8
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photography

Take photos with plenty of overlap (aim for approximately 60% overlap) and small angle changes from one photo to the next. Depending on the object being modeled, photography should have horizontal and sometimes also vertical separation between camera positions to reduce risk of gaps in the point cloud where the object surfaces aren't visible on enough photos.

The ring method for a full surround model:

How It Works – PhotoModeler’s SmartMatch and DSM 10
How It Works – PhotoModeler’s SmartMatch and DSM 11

The row method for a single face or side:

How It Works – PhotoModeler’s SmartMatch and DSM 12
How It Works – PhotoModeler’s SmartMatch and DSM 13

The aerial method for full site coverage:

How It Works – PhotoModeler’s SmartMatch and DSM 14

examples

Here are some examples using this technique - with a brief description, a sample photo, the camera positions, and the 3D model for each:

Sample Description

Sample Photo

Photography Layout

3D Result

  • Stock pile survey
  • 28 photos
  • Colorized by height
  • Alternate Arrow Right
    Volume measurement
How It Works – PhotoModeler’s SmartMatch and DSM 15
How It Works – PhotoModeler’s SmartMatch and DSM 16
How It Works – PhotoModeler’s SmartMatch and DSM 17
  • Building facade 
  • 40 photos
  • Architectural preservation
  • Alternate Arrow Right
    Point cloud
How It Works – PhotoModeler’s SmartMatch and DSM 18
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How It Works – PhotoModeler’s SmartMatch and DSM 20
  • Statue
  • 34 photos
  • Additional manual points and lines
  • Alternate Arrow Right
    Photo-textured surfaces
How It Works – PhotoModeler’s SmartMatch and DSM 21
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How It Works – PhotoModeler’s SmartMatch and DSM 23
  • Aztec stone artifact
  • 15 photos
  • No-touch artifact models
  • Alternate Arrow Right
    Dimensions
How It Works – PhotoModeler’s SmartMatch and DSM 24
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  • Petrogylph mapping
  • 5 photos
  • Contours
  • Alternate Arrow Right
    Photo-textures
How It Works – PhotoModeler’s SmartMatch and DSM 27
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tools to use

PhotoModeler tools used in these projects:

  • SmartMatch – To orient your photos and build the approximate shape
  • DSM/MVS – To build the dense point cloud
  • PointMesh Edit – Triangulation to triangulate/surface the point cloud
  • Points and Lines – Optional, for supplemental feature delineation

SmartMatch, DSM and PointMesh Edit tools are available in PhotoModeler Premium.

other resources