Crowd-sourced captions describing the picture. Multiple captions per picture (total = 158k), stored in a seperate csv file together with image ids and names. Images are from variety of themes ('everyday activities, events and scenes') from Flickr, photograph sharing site for both amateurs and professionals.
~30k images
Flickr30k
Original paper: From image descriptions to visual denotations: New similarity metrics for semantic inference over event descriptions
Homepage: https://shannon.cs.illinois.edu/DenotationGraph/
Bibtex:
@article{young2014image,
title={From image descriptions to visual denotations: New similarity metrics for semantic inference over event descriptions},
author={Young, Peter and Lai, Alice and Hodosh, Micah and Hockenmaier, Julia},
journal={Transactions of the Association for Computational Linguistics},
volume={2},
pages={67--78},
year={2014},
publisher={MIT Press}
}