We present a novel approach to leverage prior knowledge encapsulated in
pre-trained text-to-image diffusion models for blind super-resolution (SR).
Specifically, by employing our time-aware encoder, we can achieve promising
restoration results without altering the pre-trained synthesis model, thereby
preserving the generative prior and minimizing training cost. To remedy the
loss of fidelity caused by the inherent stochasticity of diffusion models, we
introduce a controllable feature wrapping module that allows users to balance
quality and fidelity by simply adjusting a scalar value during the inference
process. Moreover, we develop a progressive aggregation sampling strategy to
overcome the fixed-size constraints of pre-trained diffusion models, enabling
adaptation to resolutions of any size. A comprehensive evaluation of our method
using both synthetic and real-world benchmarks demonstrates its superiority
over current state-of-the-art approaches.

本文介绍了一种新的方法，利用预先训练的文本到图像扩散模型中所包含的先前知识来实现盲超分辨率，并通过引入可控特征包装模块和渐进聚合采样策略来克服扩散模型固定尺寸的限制，实现对任何大小分辨率的适应，并在综合评估中展示了该方法在超分辨率领域的优越性。