Improving the Energy Efficiency and Robustness of tinyML Computer Vision using Log-Gradient Input Images

Qianyun Lu; Boris Murmann

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arXiv · 2203.02571

Improving the Energy Efficiency and Robustness of tinyML Computer Vision using Log-Gradient Input Images

Qianyun Lu·Boris Murmann

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Abstract

This paper studies the merits of applying log-gradient input images to convolutional neural networks (CNNs) for tinyML computer vision (CV). We show that log gradients enable: (i) aggressive 1.5-bit quantization of first-layer inputs, (ii) potential CNN resource reductions, and (iii) inherent robustness to illumination changes (1.7% accuracy loss across 1/32...8 brightness variation vs. up to 10% for JPEG). We establish these results using the PASCAL RAW image data set and through a combination of experiments using neural architecture search and a fixed three-layer network. The latter reveal that training on log-gradient images leads to higher filter similarity, making the CNN more prunable. The combined benefits of aggressive first-layer quantization, CNN resource reductions, and operation without tight exposure control and image signal processing (ISP) are helpful for pushing tinyML CV toward its ultimate efficiency limits.

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Qianyun Lu, Boris Murmann. 2022-03-04. Improving the Energy Efficiency and Robustness of tinyML Computer Vision using Log-Gradient Input Images. https://arxiv.org/abs/2203.02571

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