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Photometric stereo analyzes multiple images of an object under different lighting conditions to estimate a normal direction at each pixel. Photometric stereo is a technique in computer vision for estimating the surface normals of objects by observing that object under different lighting conditions ().
Low altitude aerial photograph for use in photogrammetry. Location: Three Arch Bay, Laguna Beach, California. Photogrammetry is the science and technology of obtaining reliable information about physical objects and the environment through the process of recording, measuring and interpreting photographic images and patterns of electromagnetic radiant imagery and other phenomena.
Compared to 3D laser scanning, structured-light scanners can offer advantages in speed and safety by using non-coherent light sources like LEDs or projectors instead of lasers. This approach allows for relatively quick data capture over large areas and reduces potential safety concerns associated with laser use.
The time-of-flight 3D laser scanner is an active scanner that uses laser light to probe the subject. At the heart of this type of scanner is a time-of-flight laser range finder . The laser range finder finds the distance of a surface by timing the round-trip time of a pulse of light.
Images, video, laser scan 1994 Eos Systems - PhotoModeler: $995-$2995 or from $49/month, edu discounts [4] Yes Free no-save demo mode, or free 30 day all features trial. Photosynth: Unknown Microsoft Windows: Standalone No Yes, multiple images Close-range Images 2008 Microsoft Live Labs, University of Washington: Free Pix4Dmapper: Proprietary
In photogrammetry and computer stereo vision, bundle adjustment is simultaneous refining of the 3D coordinates describing the scene geometry, the parameters of the relative motion, and the optical characteristics of the camera(s) employed to acquire the images, given a set of images depicting a number of 3D points from different viewpoints.
As the output of 3D scanning processes, point clouds are used for many purposes, including to create 3D computer-aided design (CAD) or geographic information systems (GIS) models for manufactured parts, for metrology and quality inspection, and for a multitude of visualizing, animating, rendering, and mass customization applications.
Illuminance diagram with units and terminology. In photometry, illuminance is the total luminous flux incident on a surface, per unit area. [1] It is a measure of how much the incident light illuminates the surface, wavelength-weighted by the luminosity function to correlate with human brightness perception. [2]