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Acknowledgement:

The authors would like to acknowledge and thank the Flickr users whose images are part of this dataset. The usernames are listed below in no particular order.

- cmlburnett
- JB Imaging
- rjt208
- Sou'wester
- phes999
- auTomoTiVe FreAk
- LeszekZadlo
- Mhln
- richardavis
- timd2000
- TAIwiffic
- ocreationsphotography
- smata2
- jadepike4
- kitekid
- rreed3
- Rich Moffitt
- albertosepe
- Dustin Hall
- Rolandito
- Tracy Sasser
- EricaJoy
- Leonardo Paris
- Guido Jansen
- micisi
- John Alarcon
- Vincent
- SanSuiSo

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Image download:

The list of URLs corresponding to the images and the matlab script that allows downloading these images are in the folder image_download/. Note that 87 out of 643 images while present in the dataset are currently unavailable in flickr and have been point out in missing_list.txt