  In this paper we examine the problem of inverse rendering of real face
images. Existing methods decompose a face image into three components (albedo,
normal, and illumination) by supervised training on synthetic face data.
However, due to the domain gap between real and synthetic face images, a model
trained on synthetic data often does not generalize well to real data.
Meanwhile, since no ground truth for any component is available for real
images, it is not feasible to conduct supervised learning on real face images.
To alleviate this problem, we propose a weakly supervised training approach to
train our model on real face videos, based on the assumption of consistency of
albedo and normal across different frames, thus bridging the gap between real
and synthetic face images. In addition, we introduce a learning framework,
called IlluRes-SfSNet, to further extract the residual map to capture the
global illumination effects that give the fine details that are largely ignored
in existing methods. Our network is trained on both real and synthetic data,
benefiting from both. We comprehensively evaluate our methods on various
benchmarks, obtaining better inverse rendering results than the
state-of-the-art.
