lördag 30 mars 2019

AutoFace - Create Rigged and Textured Character from a Single Photograph

During the last month I have been working on an old idea: a collection of scripts that creates a rigged and textured character from a single photograph. Today I am proud to announce the result: AutoFace. The scripts are usable, although not completely finished and the results are not perfect.

AutoFace documentation is found at http://diffeomorphic.blogspot.com/p/autoface.html.

A zip file can be downloaded from https://bitbucket.org/Diffeomorphic/autoface/downloads/.

Or if you prefer to clone the Mercurial repository: https://bitbucket.org/Diffeomorphic/autoface.

AutoFace uses quite a large number of external libraries, listed in the Prerequisites https://diffeomorphic.blogspot.com/p/prerequisites-1.html.


At the core of AutoFace is a deep convolutional neural network model and python code for robust estimation of the 3DMM face identity shape networks, directly from an unconstrained face image and without the use of face landmark detectors. The method is described in

A. Tran, T. Hassner, I. Masi, G. Medioni, "Regressing Robust and Discriminative 3D Morphable Models with a very Deep Neural Network", in CVPR, 2017. The preprint version is available as arXiv:1612.04904 [cs.CV].

Code from this project has been generously shared on Github: https://github.com/fengju514/Expression-Net. That site also contains code for estimating expressions and face poses, but AutoFace does not yet make use of this data.

Whereas the Expression-Net script does the job of recreating the 3D face from a photograph, the output is not really useful for the practising artist. The script outputs morphs for a modified Basel Face Model (BFM), which seems to be a favorite among AI researchers. The BFM is a high-density face mesh, but in practise we want a medium-density full body mesh, which is rigged and textured.

The goal of AutoFace is to transfer the output from the BFM to useful meshes, in particular the Genesis 8 Male and Female characters used in DAZ Studio. After the morphs have been transferred, we can load the characters into DAZ Studio and add hair, clothes and body morphs. The dressed characters can then be used in DAZ Studio or exported to other application. I personally use the DAZ importer to import the characters into Blender, where they can be posed and rendered.


The pictures below show some results for images of two beloved candidates of the 2016 US presidential election. This images are included in Autoface.

Input images, with landmarks detected by Dlib.
Basel Face Model
Genesis 8 Male and Female
Textures
Rendered
Clothes, hair and body morphs added in DAZ Studio.
Imported into Blender, posed and rendered.
As you can immediately tell from these images, the results are not perfect. The obvious flaw is that the characters look far too young. A possible workaround could be to add some aging morphs in DAZ Studio, although it is not satisfactory.

For best results we should start with a frontal photograph of a face in neutral position. The picture of secretary Clinton shows why. The deep network removes the smile from the 3D mesh, but it still lingers in the texture, in particular in the artifacts around the cheeks.






1 kommentar:

  1. While the morph of Hillary doesn't look like a young Hillary Clinton in my eyes (more like Angie Dickinson of Police Woman TV show fame in my eyes) the morph of Donald Trump does like like a young Donald Trump in a black & white photo I saw of him, apparently he was a cadet and went to a military school.

    The 'too young' is also the same problem the other face morph creation code products have. I have bought 2 of them. Maybe if the wrinkles and expressions could be removed and then reapplied as facially rigged expressions and the wrinkles as displacement maps to the applied morph(s). Way beyond me to probably even get the support libraries compiled & installed needed for me to even try out your autoface code!

    Thanks very much for your effort. It's very good work.

    SvaraRadera