Cocktail: Mixing Multi-Modality Controls for Text-Conditional Image Generation

TL;DR

Cocktail introduces a multi-modal control pipeline for text-conditional diffusion models, enabling refined spatial and multi-signal control for high-quality, faithful image generation.

Contribution

The paper presents a novel framework combining a hyper-network gControlNet, ControlNorm, and spatial guidance sampling to incorporate multiple control signals into diffusion models.

Findings

Effective multi-modal control of image generation

High fidelity and spatial accuracy in generated images

Flexible fusion of diverse control signals

Abstract

Text-conditional diffusion models are able to generate high-fidelity images with diverse contents. However, linguistic representations frequently exhibit ambiguous descriptions of the envisioned objective imagery, requiring the incorporation of additional control signals to bolster the efficacy of text-guided diffusion models. In this work, we propose Cocktail, a pipeline to mix various modalities into one embedding, amalgamated with a generalized ControlNet (gControlNet), a controllable normalisation (ControlNorm), and a spatial guidance sampling method, to actualize multi-modal and spatially-refined control for text-conditional diffusion models. Specifically, we introduce a hyper-network gControlNet, dedicated to the alignment and infusion of the control signals from disparate modalities into the pre-trained diffusion model. gControlNet is capable of accepting flexible modality signals, encompassing the simultaneous reception of any combination of modality signals, or the supplementary fusion of multiple modality signals. The control signals are then fused and injected into the backbone model according to our proposed ControlNorm. Furthermore, our advanced spatial guidance sampling methodology proficiently incorporates the control signal into the designated region, thereby circumventing the manifestation of undesired objects within the generated image. We demonstrate the results of our method in controlling various modalities, proving high-quality synthesis and fidelity to multiple external signals.