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This tutorial explains how to use the open‑source RobustVideoMatting project to perform human portrait segmentation and replace video backgrounds, covering environment setup, model loading, custom image‑and‑video matting functions, and final video composition with OpenCV.
Kuaishou's audio‑video technology team presents a self‑developed custom video matting system that combines foreground, interactive, and video object segmentation to let creators extract arbitrary subjects without green screens, featuring adaptive cropping, multi‑stage training, and deployment across Android and iOS devices.
Leveraging deep neural networks, this article introduces a pioneering two‑stage video matting framework that propagates sparse Trimap annotations across frames using cross‑attention, integrates spatio‑temporal features via a ST‑FAM module, and demonstrates superior performance on synthetic and real HD video datasets.
Ren Haibing, Alibaba’s senior algorithm expert, explains how deep‑learning AI matting—combining salient object detection, semantic and instance segmentation in a two‑stage hard‑then‑soft pipeline—replaces traditional methods, achieves hair‑level detail and temporal consistency, scores 84.3% on Cityscapes, powers large‑scale video‑person extraction, and relies on human review to meet growing industry demand.