summary.md

# RefCOCO Non-Person Grounding Subset: Stage 1

- Selected metadata records: 6,042
- Successfully downloaded images: 6,042
- Image download failures: 0
- Counting rule: COCO non-person, non-crowd annotations with width and height >= 16 px and area >= max(512 px^2, 0.1% of image area).
- `instances` includes all non-person COCO annotations; `eligible_for_count` identifies the stricter counted instances.
- Layout hints are geometric, annotation-derived prelabels only; visual-language verification is intentionally deferred to the Qwen stage.

## Reference Inputs

- refcoco: 142,210 source reference expressions
- refcoco+: 141,564 source reference expressions
- refcocog: 95,010 source reference expressions

## Non-Person Instance Count Distribution

| Count | Images |
|---:|---:|
| 4 | 733 |
| 5 | 693 |
| 6 | 703 |
| 7 | 640 |
| 8 | 672 |
| 9 | 530 |
| 10 | 416 |
| 11 | 376 |
| 12 | 256 |
| 13 | 206 |
| 14 | 167 |
| 15 | 132 |
| 16 | 106 |
| 17 | 96 |
| 18 | 70 |
| 19 | 57 |
| 20 | 39 |
| 21 | 42 |
| 22 | 25 |
| 23 | 20 |
| 24 | 11 |
| 25 | 13 |
| 26 | 7 |
| 27 | 8 |
| 28 | 9 |
| 29 | 6 |
| 30 | 2 |
| 31 | 2 |
| 32 | 2 |
| 33 | 1 |
| 37 | 1 |
| 39 | 1 |

## Category Distribution

| Category | Counted instances |
|---|---:|
| chair | 5,964 |
| car | 3,131 |
| cup | 3,069 |
| bowl | 2,715 |
| dining table | 2,711 |
| bottle | 2,205 |
| wine glass | 1,670 |
| broccoli | 1,361 |
| banana | 1,319 |
| book | 1,168 |
| umbrella | 1,137 |
| potted plant | 1,093 |
| carrot | 1,086 |
| orange | 1,006 |
| cake | 980 |
| pizza | 975 |
| motorcycle | 947 |
| handbag | 898 |
| truck | 846 |
| apple | 830 |
| donut | 820 |
| suitcase | 754 |
| cow | 751 |
| elephant | 692 |
| sandwich | 677 |
| bicycle | 650 |
| teddy bear | 641 |
| sheep | 639 |
| vase | 632 |
| boat | 609 |
| bench | 607 |
| zebra | 597 |
| backpack | 586 |
| horse | 583 |
| laptop | 556 |
| knife | 550 |
| bus | 528 |
| fork | 502 |
| giraffe | 463 |
| couch | 450 |
| spoon | 447 |
| tv | 422 |
| hot dog | 354 |
| bird | 300 |
| airplane | 300 |
| tennis racket | 298 |
| skateboard | 254 |
| traffic light | 251 |
| dog | 240 |
| tie | 215 |
| cell phone | 207 |
| skis | 194 |
| surfboard | 186 |
| train | 175 |
| refrigerator | 172 |
| keyboard | 169 |
| toilet | 169 |
| oven | 165 |
| kite | 151 |
| sink | 147 |
| remote | 143 |
| cat | 138 |
| baseball bat | 136 |
| bed | 115 |
| snowboard | 114 |
| clock | 105 |
| baseball glove | 94 |
| mouse | 79 |
| toothbrush | 78 |
| microwave | 76 |
| sports ball | 69 |
| parking meter | 66 |
| scissors | 64 |
| fire hydrant | 57 |
| stop sign | 41 |
| frisbee | 38 |
| bear | 16 |
| toaster | 8 |
| hair drier | 5 |

## Source Dataset Coverage

| Source | Images |
|---|---:|
| refcoco | 4,545 |
| refcoco+ | 4,544 |
| refcocog | 4,021 |

## Layout Hints

| Hint | Images |
|---|---:|
| grid | 1,510 |
| mixed | 2,103 |
| multi_row | 1,742 |
| single_row | 687 |