Photogrammetry
A technique that captures large numbers of overlapping photographs from multiple angles and applies Structure from Motion (SfM) algorithms to generate dense point clouds and reconstruct three-dimensional models with real textures. It is widely used in archaeology, heritage conservation, and engineering surveying.
Timeline (last 90 days)
Photogrammetry relies solely on reconstructing from photos taken at multiple angles and has the lowest hardware threshold, but it depends on richly textured surfaces and performs poorly in reconstructing solid-colored or transparent objects.
To achieve absolute millimeter-level accuracy with pure software photogrammetry, calibration boards or rulers of known dimensions must be placed in the scene; otherwise, only a model with correct proportions but unknown absolute dimensions can be reconstructed.
Achieving millimeter-level accuracy requires ensuring 60%–80% photo overlap and shooting in a circular pattern around the object from multiple angles and heights.
Pure photogrammetry solutions have the lowest cost but take longer, while mobile devices equipped with LiDAR have an advantage in speed and convenience but slightly inferior absolute accuracy compared to professional laser scanning
Achieving controllable camera movement requires the model to internally construct a three-dimensional representation of the scene (such as point clouds, meshes, voxels, or neural implicit representations) to ensure geometric consistency across different viewpoints
All Facts (5)
Achieving controllable camera movement requires the model to internally construct a three-dimensional representation of the scene (such as point clouds, meshes, voxels, or neural implicit representations) to ensure geometric consistency across different viewpoints
60%UnverifiedPhotogrammetry relies solely on reconstructing from photos taken at multiple angles and has the lowest hardware threshold, but it depends on richly textured surfaces and performs poorly in reconstructing solid-colored or transparent objects.
50%UnverifiedTo achieve absolute millimeter-level accuracy with pure software photogrammetry, calibration boards or rulers of known dimensions must be placed in the scene; otherwise, only a model with correct proportions but unknown absolute dimensions can be reconstructed.
50%UnverifiedAchieving millimeter-level accuracy requires ensuring 60%–80% photo overlap and shooting in a circular pattern around the object from multiple angles and heights.
50%UnverifiedPure photogrammetry solutions have the lowest cost but take longer, while mobile devices equipped with LiDAR have an advantage in speed and convenience but slightly inferior absolute accuracy compared to professional laser scanning
50%