Laser Electro-Optic System For Rapid Three-Dimensional (3-D) Topographic Mapping Of Surfaces

Altschuler, Martin D.; Altschuler, Bruce R.; Taboada, J.

doi:10.1117/12.7972842

Cited by 48 publications

(14 citation statements)

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“…Resolution of 20 microns has been achieved for teeth slightly larger than a cubic centimeter (13mm field of view). 6 . CONCLUSIONS Structured laser light arrays using solid state electro-optic components for projection, detection, and calculation, may soon be very portable, compact, fast, and practical systems for 3-D measurement of solids.…”

Section: Resultsmentioning

confidence: 95%

<title>Remote 3-D laser topographic mapping with dental application</title>

Altschuler

1991

SPIE Proceedings

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In 1979 we first reported progress on a unique 3-D quantitative mapping structured light method to rapidly and remotely interrogate an unknown surface with an array of laser beams, and to observe and measure the 3-D surfaces off-axis with one or more videocameras.-'2 Significant progress has occurred recently to make this method practical and cost-effective.The system consists of: 1) at least one passive sensor--typically a 512 X 512 square pixel low-light-level CID image intensified progressive scan videocamera operating at 30 Hz; 2) an off-axis active structured laser projector using a 532nm doubled YAG solid state polarized laser, beam formers and a prismatic optic, to simultaneously generate a 128 X 128 square laser beamlet array; 3) a spatially programmable light modulator to block or transmit selected sets of 128 rows (or 128 columns) of laser beams (corresponding to the generated array) at millisecond frame rates; 4) optics to project the structured light sets onto the object; 5) optics at the sensor end; 6) positioning equipment to manipulate the object as required; 7) suitable image processors, array processors, and computers for signal and image processing, calculation of tables of X,Y,Z numerical data, interactive display, and archiving; 8)interfaces to other CAD/CAM systems for the replication of surfaces, or the reconstruction of multiple surfaces into geometric forms..

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Section: Resultsmentioning

confidence: 95%

<title>Remote 3-D laser topographic mapping with dental application</title>

Altschuler

1991

SPIE Proceedings

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“…mm X 300-mm X 300-mm volume (M = 100,000 assuming 64K points per second). Altschuler et al [1981] and Potsdamer and Altschuler [1982] developed a numerical stereo camera consisting of a laser and an electro-optic shutter synchronized to a video camera. They used standard binary patterns and performed experiments using two crossed electro-optic shutters (grid patterns).…”

Section: Structured Light: Coded Binary Patternsmentioning

confidence: 99%

Active Optical Range Imaging Sensors

Besl¹

1989

Springer Series in Perception Engineering

131

117

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Active, optical range imaging systems collect three-dimensional coordinate data from object surfaces. These systems can be useful in a wide variety of automation applications, including shape acquisition, bin picking, assembly, inspection, gauging, robot navigation, medical diagnosis, cartography, and military tasks. The range-imaging sensors in such systems are unique imaging devices in that the image data points explicitly represent scene surface geometry in a sampled form. At least six different optical principles have been used to actively obtain range images: (1) radar, (2) triangulation, (3) moire, (4) holographic interferometry, (5) lens focusing, and (6) diffraction. The relative capabilities of different sensors and sensing methods are evaluated using a figure of merit based on range accuracy, depth of field, and image acquisition time.

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“…The set of projection masks constitutes a range of resolution elements of N different binary numbers. The shutters will be controlled electro-optically or mechanically [6], [7]. The main advantage of this approach is that for a system using identical light stripes the cost of measurements and image processing is optimum.…”

Section: Binary Pattern Projectionmentioning

confidence: 99%

<title>High-resolution fully 3-D mapping of human surfaces by laser array camera and data representations</title>

Bae

Altschuler

1991

SPIE Proceedings

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A 3-D surface is mensurated by active triangulation: an electro-optically controlled laser camera projects an array of beams onto the surface, and an optical camera detects the reflected images from a different perspective. By controlling the projection of the rays in a binary pattern mode, it is possible to correlate automatically the surface positions illuminated by the active camera and observed by the passive camera, and thus achieve the rapid triangulation of multiple surface points in three dimensions. The present implementation technique is discussed in comparison with other data acquisition methods. After an entire body surface i mensurated by multiple perspectives around the body, a volumetric representation is generated. Some examples are displayed using computer graphics.

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Laser Electro-Optic System For Rapid Three-Dimensional (3-D) Topographic Mapping Of Surfaces

Cited by 48 publications

References 0 publications

<title>Remote 3-D laser topographic mapping with dental application</title>

<title>Remote 3-D laser topographic mapping with dental application</title>

Active Optical Range Imaging Sensors

<title>High-resolution fully 3-D mapping of human surfaces by laser array camera and data representations</title>

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