AD-Relight: Training-Free Banner Relighting via Illumination Translation with Diffusion Priors
AD-Relight is a training-free method to seamlessly relight custom ad banners into existing scenes by adapting a diffusion model at test time. It solves the problem where inserted banners look inconsistent with the scene's lighting, especially on horizontal surfaces. The framework uses three stages—Shade Alignment, Light Feature Estimation, and Relighting—to ensure new banners match the original scene's illumination.