Table 1 A comparison of 3D imaging methods
Type | Sensor | Principle | Advantages | Disadvantages | Output |
|---|---|---|---|---|---|
Active | Uses active sensors such as structured light and laser scanners | Uses radiometric interaction with the object to directly capture a 3D point cloud | (1) Overcomes correspondence problems (2) High accuracy | (1) Limited to specific environments and illumination conditions (2) Requires specialized, expensive equipment (3) Lack of color information | (1) 3D point clouds (2) Depth maps |
Passive | Uses passive sensors such as standard imaging cameras | Analyzes multiple images from different perspectives to generate a 3D point cloud | (1) Low cost (2) Includes color information | (1) Correspondence problems (2) Low accuracy (outliers and noise) (3) Computationally complex (4) Relatively slow | (1) 3D point clouds (2) Depth maps (3) Voxels |