GCFSR: a Generative and Controllable Face Super Resolution Method Without Facial and GAN Priors

Face image super resolution (face hallucination) usu-ally relies on facial priors to restore realistic details and preserve identity information. Recent advances can achieve impressive results with the help of GAN prior. They ei-ther design complicated modules to modify the fixed GAN prior or adopt complex training strategies to finetune the generator. In this work, we propose a generative and controllable face SR framework, called GCFSR, which can re-construct images with faithful identity information without any additional priors. Generally, GCFSR has an encoder-generator architecture. Two modules called style modu-lation and feature modulation are designed for the multi-factor SR task. The style modulation aims to generate real-istic face details and the feature modulation dynamically fuses the multi-level encoded features and the generated ones conditioned on the upscaling factor. The simple and elegant architecture can be trained from scratch in an end-to-end manner. For small upscaling factors (≤8), GCFSR can produce surprisingly good results with only adversar-ialloss. After adding L1 and perceptual losses, GCFSR can outperform state-of-the-art methods for large upscalingfac-tors (16, 32, 64). During the test phase, we can modulate the generative strength via feature modulation by changing the conditional upscaling factor continuously to achieve various generative effects. Code is available at https://github.com/hejingwenhejingwen/GCFSR