FPD: Fringe Photometric Deflectometry when Fringe Meets Photometric Stereo

Fringe Photometric Deflectometry (FPD) is built for industrial surfaces that are neither purely diffuse nor purely specular. A phone back plate, for example, may contain shiny logo regions, matte body regions, scratches, and fingerprint smudges in the same field of view. FPD treats PMD and PS as complementary measurement branches, then fuses them according to local reflectance.

The work appears in ICIVC 2025 and connects optical 3D reconstruction with deployable defect inspection. The project resources include the paper source, system diagrams, reconstruction comparisons, Smart3 interface views, and final inspection outputs.

Problem setting

Fringe Photometric Deflectometry (FPD) combines PMD phase-gradient cues with PS normal and curvature cues for non-Lambertian industrial surfaces. PMD provides reliable fringe-based gradients on shiny regions, while PS preserves fine surface details on diffuse regions. The method estimates specular and diffuse reflection components, derives adaptive PMD/PS confidence weights, and fuses the two modalities for more complete surface reconstruction.

The figures below collect representative visual evidence from 2025 10th International Conference on Image, Vision and Computing (ICIVC), 408-413.

Method and visual evidence

The figures below summarize the paper’s setup, signal flow, and visual evidence.

Method overview.

Representation and setup.

Experimental evidence.

Result comparison.

Additional visual result.

Results and impact

The evaluation reported in 2025 10th International Conference on Image, Vision and Computing (ICIVC), 408-413 is summarized through the figures above.