Segment Anything Model (SAM) has demonstrated powerful zero-shot segmentation performance in natural scenes. The recently released Segment Anything Model 2 (SAM2) has further heightened researchers' expectations towards image segmentation capabilities. To evaluate the performance of SAM2 on class-agnostic instance-level segmentation tasks, we adopt different prompt strategies for SAM2 to cope with instance-level tasks for three relevant scenarios: Salient Instance Segmentation (SIS), Camouflaged Instance Segmentation (CIS), and Shadow Instance Detection (SID). In addition, to further explore the effectiveness of SAM2 in segmenting granular object structures, we also conduct detailed tests on the high-resolution Dichotomous Image Segmentation (DIS) benchmark to assess the fine-grained segmentation capability. Qualitative and quantitative experimental results indicate that the performance of SAM2 varies significantly across different scenarios. Besides, SAM2 is not particularly sensitive to segmenting high-resolution fine details. We hope this technique report can drive the emergence of SAM2-based adapters, aiming to enhance the performance ceiling of large vision models on class-agnostic instance segmentation tasks.

本文针对Segment Anything Model 2（SAM2）在类别无关实例级分割任务中的表现进行了评估，填补了现有研究中的评测空白。通过采用不同的提示策略，研究揭示了SAM2在显著实例分割、伪装实例分割和阴影实例检测等场景中的性能差异以及对高分辨率结构分割的局限性。结果显示，SAM2的表现具有场景依赖性，提出利用SAM2适配器以提升大规模视觉模型在该领域的性能上限的建议。

针对类别无关实例级分割的SAM 2评估研究