Category Archives for "Tip video"

Posts on the PhotoModeler tip videos.

Tip 51: Creating Lofted Surfaces in Photogrammetry

PhotoModeler has the ability to create NURBS-based curves and surfaces. NURBS are Non-Uniform Rational B-Splines. These are a power mathematical definition for curves and curved surfaces used by many top-end CAD packages. In the case of photogrammetry the data that supports the curves (3d points or 2d curve profiles) are created from the photo data. […]

Tip 50: PhotoModeler’s Drag and Drop Interface

A quick tip today. Many modern apps accept some form of drag and drop. The ability to click on a file in the Windows File Explorer and drag into an open app improves ease of use and efficiency. PhotoModeler can accept two different file types for drag and drop. You can drag a PhotoModeler project […]

Tip 48: Running a PhotoModeler Motion Project

This tip video demonstrates the steps, start to finish, to run a PhotoModeler Motion type 1 project. A type 1 project is multiple synchronized cameras capturing a moving object in 3D. This video is an addendum to the blog post of last week Capturing Motion with Photogrammetry and PhotoModeler, which described two different projects that captured […]

Tip 47: Extract stills from video for photogrammetry

Can a video camera be used for photogrammetry (the science of extracting 3d measurements, models and scans from photos)?  The answer now is ‘yes’. In the past there were two issues with using video cameras for photogrammetry: Photogrammetry packages work with still photographs, not moving video files. Video cameras had low resolution. The latter issue […]

Tip 45: Projecting an external 3d model onto a photo

There are a number of applications where you want to overlay an existing 3D model onto a photograph. The technical term is ‘3D Projection’. Projection allows you to see the 3D model overlaid on the photograph in the correct orientation and taking into account perspective. This tip video demonstrates the projection technique using photogrammetry in […]

Tip 44: Creating an orthophoto on a non-coordinate plane

An orthophoto is ‘flattened’ photo – an orthographic projection (perspective distortions removed) of photographic data. Orthophotos can be useful in certain applications because they act like maps or drawings – that is, you can do measurement on them (distance and angle). For PhotoModeler to create an orthophoto, it needs to know the shape of the […]

Tip 43: Renumbering points in PhotoModeler

This tip deals with point IDs (identifier numbers) and why and how to change them. An ID is a unique integer number that all objects (points, lines, curves, surfaces, meshes, camera stations, etc.) get assigned automatically by PhotoModeler. Note, IDs are unique within an object type (all point IDs are unique) but are not across […]

Tip 42: Multiple scales in photogrammetry

A photogrammetry project typically needs an external scale. With photogrammetric measurement and modeling, the scale is not known until specified. For example, the photogrammetry program does not know if you are inputing photos of a small toy car, or of a full size car.  The two cases where one does not define a scale are: […]

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