Exploiting sparsity in time-of-flight range acquisition using a single time-resolved sensor
Author(s)Kirmani, Ahmed; Colaco, Andrea B.; Wong, Franco N. C.; Goyal, Vivek K.
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Range acquisition systems such as light detection and ranging (LIDAR) and time-of-flight (TOF) cameras operate by measuring the time difference of arrival between a transmitted pulse and the scene reflection. We introduce the design of a range acquisition system for acquiring depth maps of piecewise-planar scenes with high spatial resolution using a single, omnidirectional, time-resolved photodetector and no scanning components. In our experiment, we reconstructed 64 × 64-pixel depth maps of scenes comprising two to four planar shapes using only 205 spatially-patterned, femtosecond illuminations of the scene. The reconstruction uses parametric signal modeling to recover a set of depths present in the scene. Then, a convex optimization that exploits sparsity of the Laplacian of the depth map of a typical scene determines correspondences between spatial positions and depths. In contrast with 2D laser scanning used in LIDAR systems and low-resolution 2D sensor arrays used in TOF cameras, our experiment demonstrates that it is possible to build a non-scanning range acquisition system with high spatial resolution using only a standard, low-cost photodetector and a spatial light modulator.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics; Program in Media Arts and Sciences (Massachusetts Institute of Technology)
Optical Society of America
Kirmani, Ahmed et al. “Exploiting Sparsity in Time-of-flight Range Acquisition Using a Single Time-resolved Sensor.” Optics Express 19.22 (2011): 21485. © 2011 Optical Society of America
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