Machine learning

Mathematical analysis

Parameterized complexity

Programming language

Segmentation

Artificial intelligence

Set (abstract data type)

Representation (politics)

Code (set theory)

Deep learning

Solid modeling

Body shape

Pattern recognition (psychology)

Mathematics

Politics

Political science

Computer science

Pose

Algorithm

Differentiable function

Computer vision

Artificial neural network

Direct prediction of 3D body pose and shape remains a challenge even for highly parameterized deep learning models. Mapping from the 2D image space to the prediction space is difficult: perspective ambiguities make the loss function noisy and training data is scarce. In this paper, we propose a novel approach (Neural Body Fitting (NBF)). It integrates a statistical body model within a CNN, leveraging reliable bottom-up semantic body part segmentation and robust top-down body model constraints. NBF is fully differentiable and can be trained using 2D and 3D annotations. In detailed experiments, we analyze how the components of our model affect performance, especially the use ofpart segmentations as an explicit intermediate representation, and present a robust, efficiently trainable framework for 3D human pose estimation from 2D images with competitive results on standard benchmarks. Code will be made available at http://github.com/mohomran/ neural_body_fitting.

Neural Body Fitting: Unifying Deep Learning and Model Based Human Pose and Shape Estimation