Single-Shot Fourier iToF Camera with On- Chip Multifrequency Demodulation in CMOS Technology

This thesis presents a novel iToF camera that enables single-shot, on-chip multifrequency demodulation using periodic ultrashort-pulse illumination in combination with computationally efficient algorithms. By exploiting optimal Fourier-domain sensing patterns, the sensor captures the temporal response of a scene, which is typically sparse or compressible, while maintaining a practical trade-off in spatial resolution. The Fourier iToF camera was implemented in a standard 180 nm CMOS image sensor (CIS) technology and validated experimentally. The proposed sensing concept improves the accuracy and robustness of depth recovery by leveraging multifrequency measurements, enabling real-time, power-efficient 3D imaging with potential applications in robotics, the Internet of Things, autonomous systems, and beyond.

keywords: CMOS image sensor, single-shot, multi-frequency, time-of-flight, Fourier iToF