Efficient Image Synthesis with Sphere Latent Encoder

Tung Do; Thuan Hoang Nguyen; Hao Li

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arXiv · 2605.15592

Efficient Image Synthesis with Sphere Latent Encoder

Tung Do·Thuan Hoang Nguyen·Hao Li

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Abstract

Few-step image generation has seen rapid progress, with consistency and meanflow-based methods significantly reducing the number of sampling steps. Despite their low inference cost, these approaches often suffer from training instability and limited scalability. Sphere Encoder is a recent alternative that produces high-quality images in only a few steps; however, it requires repeated transitions between the pixel space and latent space during inference while jointly optimizing reconstruction and generation within a single architecture. This design leads to computational inefficiency and objective conflict between reconstruction and generation. To address these limitations, we decouple the framework into a fixed pretrained image encoder and a separate latent denoising model trained entirely in a spherical latent space. Our approach eliminates repeated pixel-space operations during training and inference, improving efficiency and allowing reconstruction and generation to specialize independently. On Animal-Faces, Oxford-Flowers and ImageNet-1K datasets, our method significantly outperforms Sphere Encoder in both generation quality and inference speed, while achieving competitive results against strong few-step and multi-step baselines.

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Tung Do, Thuan Hoang Nguyen, Hao Li. 2026-05-15. Efficient Image Synthesis with Sphere Latent Encoder. https://arxiv.org/abs/2605.15592

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