Datasets:

MM-Hallu
/

MIHBench

question string	label string	task string	num_images int64	image_names list	injected bool	object_counts string
Are there the same number of toasters in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000280930.jpg", "COCO_val2014_000000458768.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of remotes in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000435922.jpg", "COCO_val2014_000000308274.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of people in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000064030.jpg", "COCO_val2014_000000563775.jpg" ]	true	{"A": 0, "B": 2}
Are there the same number of sinks in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000506220.jpg", "COCO_val2014_000000210855.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of beds in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000451751.jpg", "COCO_val2014_000000406813.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of motorcycles in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000300773.jpg", "COCO_val2014_000000535519.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of toilets in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000111951.jpg", "COCO_val2014_000000127496.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of toothbrushes in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000362852.jpg", "COCO_val2014_000000328091.jpg" ]	false	{"A": 1, "B": 2}
Are there the same number of knifes in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000334077.jpg", "COCO_val2014_000000204930.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of dogs in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000499397.jpg", "COCO_val2014_000000307668.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of cars in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000045663.jpg", "COCO_val2014_000000240775.jpg" ]	true	{"A": 0, "B": 3}
Are there the same number of teddy bears in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000082512.jpg", "COCO_val2014_000000068411.jpg" ]	false	{"A": 1, "B": 2}
Are there the same number of traffic lights in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000555346.jpg", "COCO_val2014_000000521181.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of books in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000552656.jpg", "COCO_val2014_000000033904.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of donuts in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000566105.jpg", "COCO_val2014_000000472146.jpg" ]	false	{"A": 3, "B": 1}
Are there the same number of hot dogs in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000136785.jpg", "COCO_val2014_000000420666.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of chairs in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000258290.jpg", "COCO_val2014_000000491515.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of backpacks in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000034930.jpg", "COCO_val2014_000000577796.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of chairs in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000542325.jpg", "COCO_val2014_000000129765.jpg" ]	false	{"A": 1, "B": 2}
Are there the same number of spoons in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000075719.jpg", "COCO_val2014_000000146999.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of wine glasses in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000520781.jpg", "COCO_val2014_000000301093.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of giraffes in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000578383.jpg", "COCO_val2014_000000120472.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of umbrellas in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000263052.jpg", "COCO_val2014_000000233771.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of sandwiches in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000252179.jpg", "COCO_val2014_000000153506.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of skateboards in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000051119.jpg", "COCO_val2014_000000553912.jpg" ]	true	{"A": 0, "B": 3}
Are there the same number of cars in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000288290.jpg", "COCO_val2014_000000581081.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of motorcycles in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000446651.jpg", "COCO_val2014_000000172710.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of oranges in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000235902.jpg", "COCO_val2014_000000515670.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of sinks in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000255401.jpg", "COCO_val2014_000000357816.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of cats in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000481567.jpg", "COCO_val2014_000000569773.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of sports balls in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000063617.jpg", "COCO_val2014_000000569272.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of umbrellas in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000297574.jpg", "COCO_val2014_000000391642.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of umbrellas in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000509037.jpg", "COCO_val2014_000000521133.jpg" ]	false	{"A": 1, "B": 2}
Are there the same number of couches in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000521285.jpg", "COCO_val2014_000000002239.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of bottles in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000545385.jpg", "COCO_val2014_000000043128.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of people in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000098392.jpg", "COCO_val2014_000000551129.jpg" ]	true	{"A": 3, "B": 0}
Are there the same number of scissorses in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000190432.jpg", "COCO_val2014_000000116226.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of donuts in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000177861.jpg", "COCO_val2014_000000321790.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of broccolis in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000421762.jpg", "COCO_val2014_000000526028.jpg" ]	false	{"A": 2, "B": 3}
Are there the same number of trains in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000210404.jpg", "COCO_val2014_000000276886.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of remotes in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000339919.jpg", "COCO_val2014_000000416451.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of suitcases in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000387569.jpg", "COCO_val2014_000000464098.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of teddy bears in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000140908.jpg", "COCO_val2014_000000033882.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of wine glasses in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000189782.jpg", "COCO_val2014_000000238410.jpg" ]	true	{"A": 0, "B": 3}
Are there the same number of clocks in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000195842.jpg", "COCO_val2014_000000472960.jpg" ]	false	{"A": 1, "B": 2}
Are there the same number of forks in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000323788.jpg", "COCO_val2014_000000180541.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of spoons in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000218404.jpg", "COCO_val2014_000000430238.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of bicycles in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000390137.jpg", "COCO_val2014_000000234433.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of bicycles in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000543547.jpg", "COCO_val2014_000000020904.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of cakes in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000520561.jpg", "COCO_val2014_000000113588.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of cars in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000474862.jpg", "COCO_val2014_000000058651.jpg" ]	true	{"A": 0, "B": 2}
Are there the same number of people in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000553306.jpg", "COCO_val2014_000000192787.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of ovens in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000231610.jpg", "COCO_val2014_000000037751.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of motorcycles in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000130516.jpg", "COCO_val2014_000000511895.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of skateboards in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000539565.jpg", "COCO_val2014_000000451951.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of elephants in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000487931.jpg", "COCO_val2014_000000243569.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of clocks in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000183114.jpg", "COCO_val2014_000000260925.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of handbags in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000155997.jpg", "COCO_val2014_000000227042.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of sinks in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000146601.jpg", "COCO_val2014_000000153563.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of cats in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000037907.jpg", "COCO_val2014_000000476810.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of couches in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000549230.jpg", "COCO_val2014_000000441518.jpg" ]	false	{"A": 1, "B": 2}
Are there the same number of sheeps in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000288685.jpg", "COCO_val2014_000000373266.jpg" ]	true	{"A": 3, "B": 0}
Are there the same number of surfboards in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000570242.jpg", "COCO_val2014_000000127669.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of parking meters in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000362289.jpg", "COCO_val2014_000000491464.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of kites in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000464858.jpg", "COCO_val2014_000000288673.jpg" ]	false	{"A": 3, "B": 1}
Are there the same number of clocks in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000395130.jpg", "COCO_val2014_000000161370.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of beds in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000081594.jpg", "COCO_val2014_000000039956.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of cars in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000277625.jpg", "COCO_val2014_000000139549.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of trucks in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000164515.jpg", "COCO_val2014_000000439306.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of fire hydrants in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000027658.jpg", "COCO_val2014_000000165298.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of sheeps in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000432038.jpg", "COCO_val2014_000000075216.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of sheeps in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000465453.jpg", "COCO_val2014_000000503483.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of sinks in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000444879.jpg", "COCO_val2014_000000508481.jpg" ]	true	{"A": 0, "B": 1}
Are there the same number of mouses in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000102174.jpg", "COCO_val2014_000000181739.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of beds in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000134882.jpg", "COCO_val2014_000000577995.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of wine glasses in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000060623.jpg", "COCO_val2014_000000492107.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of bottles in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000280083.jpg", "COCO_val2014_000000444682.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of keyboards in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000475887.jpg", "COCO_val2014_000000367095.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of teddy bears in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000036450.jpg", "COCO_val2014_000000082512.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of bottles in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000280083.jpg", "COCO_val2014_000000353836.jpg" ]	false	{"A": 1, "B": 3}
Are there the same number of skateboards in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000315962.jpg", "COCO_val2014_000000534787.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of refrigerators in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000100016.jpg", "COCO_val2014_000000527644.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of dogs in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000346071.jpg", "COCO_val2014_000000052891.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of hot dogs in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000275933.jpg", "COCO_val2014_000000282437.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of broccolis in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000202573.jpg", "COCO_val2014_000000487282.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of cows in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000217393.jpg", "COCO_val2014_000000321578.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of tvs in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000491755.jpg", "COCO_val2014_000000129786.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of cats in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000324383.jpg", "COCO_val2014_000000336355.jpg" ]	true	{"A": 1, "B": 0}
Are there the same number of bicycles in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000140908.jpg", "COCO_val2014_000000485887.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of cows in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000321578.jpg", "COCO_val2014_000000183390.jpg" ]	false	{"A": 1, "B": 2}
Are there the same number of wine glasses in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000381682.jpg", "COCO_val2014_000000312192.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of people in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000472109.jpg", "COCO_val2014_000000382030.jpg" ]	true	{"A": 0, "B": 2}
Are there the same number of skateboards in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000055002.jpg", "COCO_val2014_000000379488.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of donuts in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000006484.jpg", "COCO_val2014_000000211177.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of horses in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000356787.jpg", "COCO_val2014_000000102355.jpg" ]	true	{"A": 0, "B": 2}
Are there the same number of remotes in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000011209.jpg", "COCO_val2014_000000014285.jpg" ]	false	{"A": 1, "B": 1}
Are there the same number of umbrellas in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000465087.jpg", "COCO_val2014_000000456077.jpg" ]	true	{"A": 0, "B": 2}
Are there the same number of bananas in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000383341.jpg", "COCO_val2014_000000326217.jpg" ]	false	{"A": 2, "B": 1}
Are there the same number of handbags in image 1 and image 2?	yes	count	2	[ "COCO_val2014_000000274655.jpg", "COCO_val2014_000000533811.jpg" ]	true	{"A": 0, "B": 0}
Are there the same number of giraffes in image 1 and image 2?	no	count	2	[ "COCO_val2014_000000107481.jpg", "COCO_val2014_000000544481.jpg" ]	false	{"A": 3, "B": 1}

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MIHBench

Multi-Image Hallucination Benchmark for evaluating multi-image understanding in MLLMs. 3,200 samples across 4 tasks (800 each), with each sample containing 2-4 images from COCO.

Fields

Field	Description
images	2-4 images (list)
question	Natural language question about the images
label	Ground truth: "yes" or "no"
task	Task identifier
num_images	Number of images in the sample
image_names	Source image filenames

Additional fields for count task: injected (bool), object_counts (JSON string).

Tasks

Task	# Images	Description
count	2	Same number of target object in both images?
existence_adversarial	3	Target object exists in all images? (rare/confusing objects)
existence_popular	3	Target object exists in all images? (common objects)
existence_random	3	Target object exists in all images? (random objects)

Evaluation

metrics: Accuracy, Precision, Recall, F1
parser: yes/no binary

Source

Original data from MIHBench (ACM Multimedia 2025).

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