  Creating high-quality 3D models of clothed humans from single images for
real-world applications is crucial. Despite recent advancements, accurately
reconstructing humans in complex poses or with loose clothing from in-the-wild
images, along with predicting textures for unseen areas, remains a significant
challenge. A key limitation of previous methods is their insufficient prior
guidance in transitioning from 2D to 3D and in texture prediction. In response,
we introduce SIFU (Side-view Conditioned Implicit Function for Real-world
Usable Clothed Human Reconstruction), a novel approach combining a Side-view
Decoupling Transformer with a 3D Consistent Texture Refinement pipeline.SIFU
employs a cross-attention mechanism within the transformer, using SMPL-X
normals as queries to effectively decouple side-view features in the process of
mapping 2D features to 3D. This method not only improves the precision of the
3D models but also their robustness, especially when SMPL-X estimates are not
perfect. Our texture refinement process leverages text-to-image diffusion-based
prior to generate realistic and consistent textures for invisible views.
Through extensive experiments, SIFU surpasses SOTA methods in both geometry and
texture reconstruction, showcasing enhanced robustness in complex scenarios and
achieving an unprecedented Chamfer and P2S measurement. Our approach extends to
practical applications such as 3D printing and scene building, demonstrating
its broad utility in real-world scenarios. Project page
https://river-zhang.github.io/SIFU-projectpage/ .
