Human-pose estimation based on weak supervision

Background

In computer vision, simultaneously estimating human pose, shape, and clothing is a practical issue in real life, but remains a challenging task owing to the variety of clothing, complexity of deformation, shortage of large-scale datasets, and difficulty in estimating clothing style.

Methods

We propose a multistage weakly supervised method that makes full use of data with less labeled information for learning to estimate human body shape, pose, and clothing deformation. In the first stage, the SMPL human-body model parameters were regressed using the multi-view 2D key points of the human body. Using multi-view information as weakly supervised information can avoid the deep ambiguity problem of a single view, obtain a more accurate human posture, and access supervisory information easily. In the second stage, clothing is represented by a PCAbased model that uses two-dimensional key points of clothing as supervised information to regress the parameters. In the third stage, we predefine an embedding graph for each type of clothing to describe the deformation. Then, the mask information of the clothing is used to further adjust the deformation of the clothing. To facilitate training, we constructed a multi-view synthetic dataset that included BCNet and SURREAL.

Results

The Experiments show that the accuracy of our method reaches the same level as that of SOTA methods using strong supervision information while only using weakly supervised information. Because this study uses only weakly supervised information, which is much easier to obtain, it has the advantage of utilizing existing data as training data. Experiments on the DeepFashion2 dataset show that our method can make full use of the existing weak supervision information for fine-tuning on a dataset with little supervision information, compared with the strong supervision information that cannot be trained or adjusted owing to the lack of exact annotation information.

Conclusions

Our weak supervision method can accurately estimate human body size, pose, and several common types of clothing and overcome the issues of the current shortage of clothing data.