Category Archives for "Background"

Posts with background on theory, photogrammetry, cameras, 3D, CAD, etc.

Low-Cost Cameras for Photogrammetry and Measurement

What makes a good low-cost camera for photogrammetry?  Photogrammetry is the technique of using a camera to measure and model the real world. First note that low-cost is a relative term – we are not talking about a $150 camera – instead of between $500 and $900.  This is more aptly titled: “What is the […]

Accuracy of Pile Volume Measurement with Photogrammetry

Accurate volume measurement of piles of material is important in a number of applications, such as: stock pile inventory management, volumes of tailing piles, volume of organic materials in composting operations, quarry pit size, mine reclamation, etc. These piles are difficult to measure due to their size, difficulty of traversing, and non-uniform shapes. The advent […]

Camera Fundamentals and Parameters in Photogrammetry

Photogrammetry is the science of using photographs to obtain measurements and models of real-world objects and scenes. Photogrammetric techniques involve using known information to help solve other, previously unknown information.  Several critical pieces of known information concern the camera used to capture the photographs, and defining those pieces in mathematical terms known as camera parameters. […]

PhotoModeler’s Dense Surface Modeling Accuracy Study

  We have completed an extensive accuracy study of PhotoModeler’s 3d scanning capability called Dense Surface Modeling (DSM).  The full accuracy study article can be found here: Quantifying the accuracy of dense surface modeling within PhotoModeler Scanner. The article shows that PhotoModeler Scanner can match (if not exceed) the accuracy of a laser scanner. Using […]