A Dual-Source Approach for 3D Human Pose Estimation from a Single Image

TL;DR

This paper introduces a dual-source method for 3D human pose estimation from single images, combining 2D pose estimation from images with 3D pose retrieval from motion capture data, addressing data collection challenges.

Contribution

The paper proposes a novel dual-source approach that integrates 2D pose estimation with 3D pose retrieval, enabling effective 3D pose estimation without requiring large annotated 3D datasets.

Findings

Effective 3D pose estimation from single images demonstrated

Method handles differing skeleton structures successfully

Outperforms existing approaches in accuracy

Abstract

In this work we address the challenging problem of 3D human pose estimation from single images. Recent approaches learn deep neural networks to regress 3D pose directly from images. One major challenge for such methods, however, is the collection of training data. Specifically, collecting large amounts of training data containing unconstrained images annotated with accurate 3D poses is infeasible. We therefore propose to use two independent training sources. The first source consists of accurate 3D motion capture data, and the second source consists of unconstrained images with annotated 2D poses. To integrate both sources, we propose a dual-source approach that combines 2D pose estimation with efficient 3D pose retrieval. To this end, we first convert the motion capture data into a normalized 2D pose space, and separately learn a 2D pose estimation model from the image data. During inference, we estimate the 2D pose and efficiently retrieve the nearest 3D poses. We then jointly estimate a mapping from the 3D pose space to the image and reconstruct the 3D pose. We provide a comprehensive evaluation of the proposed method and experimentally demonstrate the effectiveness of our approach, even when the skeleton structures of the two sources differ substantially.