Learning to Scale Temperature in Masked Self-Attention for Image Inpainting

TL;DR

This paper introduces a multi-head temperature masked self-attention mechanism with learned temperature parameters for improved large-region image inpainting, enhancing quality and user-guided editing capabilities.

Contribution

It proposes a novel temperature learning network and multi-head self-attention mechanism that address artifacts and limitations of previous methods, enabling better inpainting and user-guided editing.

Findings

Outperforms previous methods in image quality and metrics

Enables flexible, user-guided image editing

Demonstrates effectiveness on multiple datasets

Abstract

Recent advances in deep generative adversarial networks (GAN) and self-attention mechanism have led to significant improvements in the challenging task of inpainting large missing regions in an image. These methods integrate self-attention mechanism in neural networks to utilize surrounding neural elements based on their correlation and help the networks capture long-range dependencies. Temperature is a parameter in the Softmax function used in the self-attention, and it enables biasing the distribution of attention scores towards a handful of similar patches. Most existing self-attention mechanisms in image inpainting are convolution-based and set the temperature as a constant, performing patch matching in a limited feature space. In this work, we analyze the artifacts and training problems in previous self-attention mechanisms, and redesign the temperature learning network as well as the self-attention mechanism to address them. We present an image inpainting framework with a multi-head temperature masked self-attention mechanism, which provides stable and efficient temperature learning and uses multiple distant contextual information for high quality image inpainting. In addition to improving image quality of inpainting results, we generalize the proposed model to user-guided image editing by introducing a new sketch generation method. Extensive experiments on various datasets such as Paris StreetView, CelebA-HQ and Places2 clearly demonstrate that our method not only generates more natural inpainting results than previous works both in terms of perception image quality and quantitative metrics, but also enables to help users to generate more flexible results that are related to their sketch guidance.