Sparse and Privacy-enhanced Representation for Human Pose Estimation

TL;DR

This paper introduces a sparse, privacy-preserving representation for human pose estimation using edge and motion vector images, achieving faster processing and enhanced privacy compared to traditional methods.

Contribution

It presents a novel fusion network for sparse edge and motion vector data, significantly improving speed and reducing computational load in human pose estimation.

Findings

Achieves 13x speed-up and 96% FLOPs reduction.

Outperforms individual modalities in pose estimation accuracy.

Maintains privacy by using sparse, less-informative representations.

Abstract

We propose a sparse and privacy-enhanced representation for Human Pose Estimation (HPE). Given a perspective camera, we use a proprietary motion vector sensor(MVS) to extract an edge image and a two-directional motion vector image at each time frame. Both edge and motion vector images are sparse and contain much less information (i.e., enhancing human privacy). We advocate that edge information is essential for HPE, and motion vectors complement edge information during fast movements. We propose a fusion network leveraging recent advances in sparse convolution used typically for 3D voxels to efficiently process our proposed sparse representation, which achieves about 13x speed-up and 96% reduction in FLOPs. We collect an in-house edge and motion vector dataset with 16 types of actions by 40 users using the proprietary MVS. Our method outperforms individual modalities using only edge or motion vector images. Finally, we validate the privacy-enhanced quality of our sparse representation through face recognition on CelebA (a large face dataset) and a user study on our in-house dataset.