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