CVPR 2011 Structured light · Detailed examples
Metal Lamp: Error Detection and Correction
The challenge
Detect residual errors.
Correct them selectively.
Strong, high-frequency inter-reflections make this object difficult to scan. The initial code ensemble still contains residual errors. A consistency test detects them, and additional selectively illuminated images improve the reconstruction.
Error detection
Check agreement among the code ensemble’s depth estimates. If no two codes agree for a pixel, mark it as an error. This uses the already captured patterns and adds no acquisition-time overhead.
Selective
illumination
In subsequent iterations, correctly decoded scene points are excluded from illumination using a mask. Progressively illuminating fewer points reduces inter-reflections and residual errors. This correction approach builds on Xu et al., 2009.
03 / Results
Depth maps and 3D reconstructions
Compare the conventional methods, the initial ensemble, and the result after error detection and correction.
Conventional Gray codes · 11 images
Modulated phase shifting · 162 images
Code ensemble · 41 images
After detection and correction · 121 images
