Learning Images Across Scales Using Adversarial Training

TL;DR

This paper introduces a novel adversarial training method to learn a multiscale image representation from unstructured data, enabling high-quality zoom-in capabilities up to 256x while maintaining scale consistency.

Contribution

It presents a new multiscale generator with procedural frequency content and a training scheme for stable learning across diverse scales, outperforming previous methods.

Findings

Achieves zoom-in factors up to 256x with high quality

Demonstrates scale consistency in generated images

Outperforms state-of-the-art multiscale models

Abstract

The real world exhibits rich structure and detail across many scales of observation. It is difficult, however, to capture and represent a broad spectrum of scales using ordinary images. We devise a novel paradigm for learning a representation that captures an orders-of-magnitude variety of scales from an unstructured collection of ordinary images. We treat this collection as a distribution of scale-space slices to be learned using adversarial training, and additionally enforce coherency across slices. Our approach relies on a multiscale generator with carefully injected procedural frequency content, which allows to interactively explore the emerging continuous scale space. Training across vastly different scales poses challenges regarding stability, which we tackle using a supervision scheme that involves careful sampling of scales. We show that our generator can be used as a multiscale generative model, and for reconstructions of scale spaces from unstructured patches. Significantly outperforming the state of the art, we demonstrate zoom-in factors of up to 256x at high quality and scale consistency.