Face enchance and restore use GPEN code

[lhkjacky (Jacky)]

Gigapixel v6.1.0 have a new Face Enhancement model which is massively improved over the pervious version.
The new Gigapixel Face Enhancement Model is on par with the open source GFPGAN.
GFPGAN add extra sharpness & contrast to the face, while Gigapixel keep the face closer to the original image. For some images GFPGAN is better but for some other images Gigapixel v6.1.0 is better.

According to developer, Face Enhancement model in Gigapixel will also add to VEAI in the future.

@suraj

Upscaling small faces is being worked on for Gigapixel and when it is ready can be adapted for VEAI.

If you want this feature, you may also Vote here.

Face Reconstruction (Refinement) for small faces

It would be great VEAI included some kind of face reconstruction for face detail. When VEAI detect faces in scene, it should use a specific AI model to upscale the face. Human is very sensitive to human face, currently VEAI upscale footage without restore face detail and it often create monster faces and ruin the footage completely.