TryOnCrafter: レンダリング可能な4D試着プロキシを介した、カメラ軌道を活用するリアルなビデオ仮想試着

要旨

视频虚拟试穿（VVT）技术在动态主体上合成逼真服装覆盖方面已取得显著进展，然而现有范式在根本上仍受限于对源相机轨迹的被动依赖，无法满足全方位视角探索所需的交互自由度。为突破这一局限，我们定义了一个开创性的研究前沿：相机可控视频虚拟试穿（CaM-VVT）。与传统VVT不同，CaM-VVT不仅需要与视角无关的纹理幻化，还要求在任意无约束相机运动下，非刚性人体动态与背景上下文之间实现严格的结构同步。为应对这些挑战，我们提出了TryOnCrafter——首个专为CaM-VVT任务设计的统一DiT框架。区别于隐式像素空间操作，我们引入了一种可渲染的4D试穿代理，该代理通过将高保真2D试穿先验蒸馏至基于3DGS的穿衣化身中，进而借助SMPL-X序列驱动并经过度量对齐将其嵌入重建的背景点云，从而显式地将人体主体与环境解耦。该代理以卓越的纹理密度和运动完整性建立了稳健的结构基础。我们的代理锚定视频DiT以此稳健结构基础作为主要几何锚点，确保合成出的逼真视频严格受控于预设轨迹与物理合理的形变。得益于4D代理固有的可编辑性，TryOnCrafter支持多种下游应用，包括人体重定位、“子弹时间”效果以及360度轨道视角。

English

While Video Virtual Try-on (VVT) has achieved remarkable progress in synthesizing realistic garment overlays on dynamic subjects, existing paradigms remains fundamentally constrained by a passive dependency on source camera trajectories, failing to accommodate the requisite interactive freedom for omnidirectional viewpoint exploration. To address this limitation, we define a pioneering research frontier: Camera-controllable Video Virtual Try-on (CaM-VVT). Unlike conventional VVT, CaM-VVT not only necessitates viewpoint-agnostic texture hallucination but also strict structural synchronization between non-rigid human dynamics and background contexts under arbitrary, unconstrained camera movements. To tackle these challenges, we present TryOnCrafter, the first unified DiT-based framework specifically architected for the CaM-VVT task. Departing from implicit pixel-space manipulation, we introduce a Renderable 4D Try-on Proxy that explicitly decouples the human subject from the environment. This is achieved by distilling high-fidelity 2D try-on priors into a clothed 3DGS-based avatar, which is subsequently animated via SMPL-X sequences and metric-aligned into a reconstructed background point cloud. This proxy establishes a robust structural foundation with superior texture density and motion integrity. Our Proxy-Anchored Video DiT leverages this robust structural foundation as a primary geometric anchor, ensuring that the synthesized photorealistic videos are strictly constrained by prescribed trajectories and physically plausible deformations. Benefiting from the inherent editability of the 4D proxy, TryOnCrafter facilitates diverse downstream applications, including human relocalization, ``bullet time'' effects, and 360-degree orbital viewing.