Can We Change "Stroke Size" to Simplify Regression Learning?

arXiv:2603.26783v5 Announce Type: replace Abstract: Deep-learning-based image generation is increasingly useful but expensive. Across the different timesteps in the denoising chain, high-noise timesteps present distinct optimization and prediction challenges, which can increase the cost of real-world applications. Inspired by the varying stroke sizes used in human painting, in this work, we ask whether a similar stroke-size variation (i.e., rough stroke applied early) in diffusion can simplify existing image-generation algorithms. We subsequently develop the MultiStroke operator, which linearly interpolates coarse and fine strokes in a coarse-to-fine manner to potentially simplify the prediction target, especially at high-noise timesteps. Across DDPM and flow-matching models trained from scratch, MultiStroke achieves an FID reduction of up to $70.2\%$. A quick video is at https://wendybaiyunwei.github.io/MultiStroke-Web/.