Fig. 1. Principle of operation of an event camera. (a) Comparison of the output of a frame-based camera and an event camera when viewing a spinning disk with a black circle. (b) Events triggered by changes in log-intensity.

Fig. 2. Diagram of the main bottlenecks in applying Gray code to 3D reconstruction under an event camera. (a) Errors in extracting the boundaries of the Gray code pattern. (b) Diagram of the proposed inverted Gray code strategy.

Fig. 3. Schematic diagram of the proposed spatial-shifting Gray-code encoding method. (a) The original Gray code patterns. (b) The failure of the high-order dense Gray codes due to blurring. (c) The spatial-shifting Gray code patterns.

Fig. 4. Comparison of boundary identification results between the proposed inverted Gray code method and the conventional flashing Gray code method.

Fig. 5. Event information extracted under the projection of inverted Gray code patterns with different spatial frequencies.

Fig. 6. Measurements on a sculpture. (a) The result of the proposed inverted Gray code method. (b) The result of the proposed spatial-shifting inverted Gray code method.

Fig. 7. Measurement on an HDR scene. (a) Diagram of the HDR scene, which includes a highly reflective metal workpiece and a low-reflectance panel. (b) The result of the three-step phase-shifting method under one exposure. (c) Diagram of multiple exposures of the HDR scene. (d) Multi-exposure fusion reconstruction result. (e), (f) The respective reconstruction results of the two proposed methods using an event camera.