SOS: Synthetic Object Segments Improve Detection, Segmentation, and Grounding

• URL: http://arxiv.org/abs/2510.09110v1
• Date: Fri, 10 Oct 2025 08:04:30 GMT
• Title: SOS: Synthetic Object Segments Improve Detection, Segmentation, and Grounding
• Authors: Weikai Huang, Jieyu Zhang, Taoyang Jia, Chenhao Zheng, Ziqi Gao, Jae Sung Park, Ranjay Krishna,
• Abstract summary: We present SOS, a simple and scalable data synthesis pipeline based on an object-centric composition strategy.<n>It pastes high-quality synthetic object segments into new images using structured layout priors and generative relighting.<n>Models trained on 100000 synthetic images from SOS outperform those trained on larger real-image datasets.
• Score: 44.30364980636359
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Visual grouping -- operationalized via instance segmentation, visual grounding, and object detection -- underpins applications from robotic perception to photo editing. Large annotated datasets are costly, biased in coverage, and hard to scale. Synthetic data are promising but often lack flexibility, accuracy, and compositional diversity. We present SOS, a simple and scalable data synthesis pipeline based on an object-centric composition strategy. It pastes high-quality synthetic object segments into new images using structured layout priors and generative relighting, producing accurate and diverse masks, boxes, and referring expressions. Models trained on 100000 synthetic images from SOS outperform those trained on larger real-image datasets such as GRIT (20M) and V3Det (200K) on detection and grounding tasks, achieving +10.9 AP on LVIS detection and +8.4 $N_{\text{Acc}}$ on gRefCOCO grounding. SOS enables controllable dataset construction and improves generalization in both low-data and closed-vocabulary settings. Augmenting LVIS and COCO with synthetic object segments yields strong performance across real-data scales and even larger gains under extremely limited real data (for example, +3.83 $AP_{\text{rare}}$ on LVIS instance segmentation and +6.59 AP with a 1 percent COCO setup). This controllability also supports targeted data generation for challenging intra-class referring in visual grounding.

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