| Structured-Light Scanning |
Projects coded light patterns onto an object and calculates surface geometry from image distortion. |
Approximately 0.02–0.10 mm for professional systems |
Approximately 0.05–0.50 mm |
Seconds to several minutes per object, depending on size and alignment |
Quality inspection, reverse engineering, product design, cultural heritage, and small-to-medium parts |
Sensitive to strong ambient light, reflective surfaces, transparent materials, and object movement |
Excellent for buyers seeking high detail and versatile indoor operation |
| Laser Triangulation |
Uses one or more laser lines or points and calculates distance from the reflected laser position on a sensor. |
Approximately 0.01–0.10 mm for metrology-oriented systems |
Approximately 0.02–0.20 mm |
Fast point or line capture; complete scanning may take minutes |
Dimensional inspection, tooling, precision components, and reverse engineering |
Can be affected by shiny, dark, translucent, or highly textured surfaces; requires controlled technique |
Excellent when dimensional accuracy is more important than ease of use |
| Photogrammetry |
Combines multiple photographs taken from different viewpoints to calculate 3D coordinates and object scale. |
Approximately 0.1–1.0 mm, depending on camera setup, scale references, and processing |
Typically lower surface detail than dedicated optical scanners |
Image capture is quick; processing may take minutes to hours |
Large objects, vehicles, buildings, landforms, dimensional control, and scan-scale optimization |
Needs suitable texture, sufficient lighting, scale bars, and many overlapping images |
Very Good for large-area scanning and relatively low equipment cost |
| Time-of-Flight Scanning |
Measures the travel time of emitted light or laser pulses to determine distance from the sensor. |
Approximately 2–10 mm for general-purpose systems |
Usually millimeter-level point spacing |
Large scenes can be captured in seconds to several minutes |
Buildings, factories, infrastructure, construction documentation, and indoor mapping |
Lower fine-detail capability than close-range triangulation scanners; performance varies with range and surface reflectivity |
Very Good for large spaces and long-range documentation |
| LiDAR Scanning |
Emits laser pulses and calculates distance from return-time measurements to create dense spatial point clouds. |
Approximately 5–30 mm for many terrestrial and mobile applications |
Typically centimeter- to millimeter-level point spacing, depending on range |
Rapid coverage of large indoor or outdoor areas |
Surveying, forestry, civil engineering, topography, robotics, and asset management |
Generally unsuitable for fine small-part inspection; occlusions require multiple scan positions |
Excellent for outdoor work, long range, and large-scale spatial data |
| Contact Digitizing |
Uses a physical probe to touch reference points or trace surfaces and record their coordinates. |
Approximately 0.01–0.10 mm on suitable coordinate-measuring equipment |
Point-based data rather than continuous optical surface detail |
Slower than non-contact scanning, especially for complex surfaces |
Precision inspection, datum measurement, hard-to-scan surfaces, and verification of critical features |
Requires physical access, may leave contact marks on delicate parts, and does not capture color or texture |
Good for stable, rigid parts requiring traceable dimensional measurement |