Abstract
The precise orientation-estimation of humans relative to the pose of a monocular camera system is a challenging task due to the general aspects of camera calibration and the deformable nature of a human body in motion. Thus, novel approaches of Deep Learning for precise object pose-estimation in robotics are hard to adapt to human body analysis. In this work, a hybrid approach for the accurate estimation of a human body rotation relative to a camera system is presented, thereby significantly improving results derived from poseNet by applying analysis of optical flow in a frame to frame comparison. The human body in-place rotating in T-pose is thereby aligned in the center, applying object tracking methods to compensate for translations of the body movement. After 2D skeleton extraction, the optical flow is calculated for a region of interest (ROI) area aligned relative to the vertical skeleton joint representing the spine and compared frame by frame. To evaluate the eligibility of the clothing as a fundament for good feature, the local pixel homogeneity is taken into consideration to restrict the optical flow to heterogeneous regions with distinctive features like imprint patterns, buttons or buckles besides local illumination changes. Based on the mean optical flow with a coarse approximation of the axial body shape as ellipsis, an accuracy between 0.1° and 2.0° by a target rotation of 10° for orientation-estimation is achieved on a frame-to-frame comparison evaluated and validated on both, Computer Generated Imagery (CGI) renderings and real-world videos of people wearing clothing of varying feature appropriateness.
Original language | English |
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Pages (from-to) | 39-47 |
Number of pages | 9 |
Journal | Journal of WSCG |
Volume | 2020 |
Issue number | 2020 |
DOIs | |
Publication status | Published - 2020 |
Event | International Conferences in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG) 2020 - Pilsen, Czech Republic Duration: 18 May 2020 → 22 May 2020 http://www.wscg.eu/ |
Keywords
- Object Tracking
- Orientation-Estimation
- Optical Flow
- Image Alignment
- Human Skeleton Extraction
- Human Pose Estimation
- Pixel Homogeneity