We propose a novel sparse constrained formulation and from it derive a real-time optimization method for 3D human pose and shape estimation. Our optimization method is orders of magnitude faster (avg. 4 ms convergence) than existing optimization methods, while being mathematically equivalent to their dense unconstrained formulation. We achieve this by exploiting the underlying sparsity and constraints of our formulation to efficiently compute the Gauss-Newton direction. We show that this computation scales linearly with the number of joints of a complex 3D human model, in contrast to prior work where it scales cubically due to their dense unconstrained formulation. Based on our optimization method, we present a real-time motion capture framework that estimates 3D human poses and shapes from a single image at over 30 FPS. In benchmarks against state-of-the-art methods on multiple public datasets, our frame-work outperforms other optimization methods and achieves competitive accuracy against regression methods.

该研究提出了一种新颖的基于稀疏约束的3D人体姿态和形状估计方法，通过高效计算 Gauss-Newton 方向并利用优化问题的稀疏约束性质，将优化时间缩短到4ms左右，并成功地将其应用于单张图像的实时运动捕捉领域。

一个稀疏约束的优化方案，用于3D人体姿势与形态估计的复兴