4.7 Article

Energy Efficient Approximate 3D Image Reconstruction

Journal

IEEE TRANSACTIONS ON EMERGING TOPICS IN COMPUTING
Volume 10, Issue 4, Pages 1854-1866

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TETC.2021.3116471

Keywords

Approximate computing; parallel computing; FPGA; LiDAR; depth reconstruction; compressed sensing; convex optimisation

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This paper demonstrates an efficient and accelerated parallel, sparse depth reconstruction framework using compressed sensing and approximate computing. It also shows how reduced precision can be leveraged to reduce logic units and power consumption. The methodology has wide applications in LiDAR depth imagers.
We demonstrate an efficient and accelerated parallel, sparse depth reconstruction framework using compressed sensing (compressed sensing (CS)) and approximate computing. Employing data parallelism for rapid image formation, the depth image is reconstructed from sparsely sampled scenes using convex optimization. Coupled with faster imaging, this sparse sampling reduces significantly the projected laser power in active systems such as light detection and ranging (LiDAR) to allow eye safe operation at longer range. We also demonstrate how reduced precision is leveraged to reduce the number of logic units in field-programmable gate array (FPGA) implementations for such sparse imaging systems. It enables significant reduction in logic units, memory requirements and power consumption by over 80% with minimal impact on the quality of reconstruction. To further accelerate processing, pre-computed, important components of the lower-upper (LU) decomposition and other linear algebraic computations are used to solve the convex optimization problems. Our methodology is demonstrated by the application of the alternating direction method of multipliers (ADMM) and proximal gradient descent (PGD) algorithms. For comparison, a fully discrete least square reconstruction method ($d$dSparse) is also presented. This demonstrates the feasibility of novel, high resolution, low power and high frame rate LiDAR depth imagers based on sparse illumination for use in applications where resources are strictly limited.

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