Supplementary Material: A Light Transport Model for Mitigating Multipath Interference in Time-of-flight Sensors

We perform separation of direct and global components of light transport using the method introduced by Nayar et al. [2]. We illuminate the scene using multiple high frequency patterns and the direct and global components of illumination are obtained from the acquired images using the Nayar method, which is a closed-form, per-pixel solution. We use the DLP Lightcommander projector in near-infrared mode to illuminate the scene using a 64 × 64 pixel checkerboard pattern. The pattern is shifted 5 times by 7 pixels each time in X and Y dimensions to capture a total of 25 images. We calculate two images α and α− from these patterns, by computing the maximum and minimum intensity values observed at each pixel across all 25 images. We also capture αT , the total radiance, by projecting an all-white image on the scene. Specifically, the following equations are used to obtain the direct (αD) and global(αG) components: