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Groundbench: Multi-Resolution Polygon Grounding Exposes the Geometry Gap in Vision-Language Models
Bounding-box scores on RefCOCO-family grounding leave little room to distinguish frontier vision-language systems, yet boxes discard object shape. We introduce GroundingBench, a matched benchmark that re-targets the same 1,500 image-expression-referent triples to exact-N polygons at five vertex budg
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