Distortion correction in metasurface dot projection based on coordinate mapping.

Wide-angle structured light projection is essential for advanced three-dimensional imaging applications. However, severe geometric distortion arises from the inherent mismatch between spherical wave propagation and planar projection. In this work, we design a metasurface-driven dot array projector by introducing a coordinate pre-compensation strategy derived from the Rayleigh-Sommerfeld diffraction theory. For a 225 dot array, the proposed design achieves an average eccentricity of 0.1931 over a wide 170∘ field of view. The dot distribution in the peripheral region becomes denser. It also achieves a diffraction efficiency of 48.93%. These results demonstrate that the coordinate pre-compensation strategy can effectively correct dot array distortion.