Multipath Interference Suppression in Indirect Time-of-Flight Imaging via a Novel Compressed Sensing Framework
This addresses multipath interference for iToF imaging systems, offering a software-based solution that is incremental over existing compressed sensing approaches.
The paper tackles multipath interference in indirect Time-of-Flight imaging by proposing a compressed sensing method that uses a single modulation frequency with multiple phase shifts and narrow-duty-cycle continuous waves, achieving improved depth reconstruction accuracy and multi-target separation without hardware modifications.
We propose a novel compressed sensing method to improve the depth reconstruction accuracy and multi-target separation capability of indirect Time-of-Flight (iToF) systems. Unlike traditional approaches that rely on hardware modifications, complex modulation, or cumbersome data-driven reconstruction, our method operates with a single modulation frequency and constructs the sensing matrix using multiple phase shifts and narrow-duty-cycle continuous waves. During matrix construction, we further account for pixel-wise range variation caused by lens distortion, making the sensing matrix better aligned with actual modulation response characteristics. To enhance sparse recovery, we apply K-Means clustering to the distance response dictionary and constrain atom selection within each cluster during the OMP process, which effectively reduces the search space and improves solution stability. Experimental results demonstrate that the proposed method outperforms traditional approaches in both reconstruction accuracy and robustness, without requiring any additional hardware changes.