Table 1:

Food image databases.

Study	Database	Image content	Total # of class/image	Acquisition	Reference
Chen et al., 2009	PFID	Fast food items from USA	61/1098	Images taken in restaurants and in lab, with white background	[21]
Mariappan, 2009	TADA*	Common food in USA	256 food+50 replicas	Images collected in a controlled environment	[26]
Hoashi et al., 2010	Food85*	Japanese food	85/8500	Images derived from previous database with 50 Japanese food category and web	[25]
Chen, 2012	Chen	Chinese food	50/5000	Images downloaded from the web	[22]
Matsuda et al., 2012	UEC Food-100	Popular Japanese food	100/9060	Images acquired by digital camera (each photo has a bounding box indicating the location of the food item)	[9]
Farinella et al., 2014	Diabetes	Selected food	11/4868	Images downloaded from the web	[24]
Bossard et al., 2014	Food-101	Popular food in USA	101/101000	Images downloaded from the web	[18]
Kawano and Yanai, 2014	UEC Food-256	Popular foods in Japan and other countries	256/31397	Images acquired by digital camera (each photo has a bounding box indicating the location of the food item)	[19]
Meyers, 2015	Food201-Segmented*	Popular food in USA	201/12625	Images derived from Food 101 dataset; segmented	[11]
Beijbom et al., 2015	Menu-Match	Food from three restaurants (Asian, Italian, and soup)	41/646	Images taken by authors	[20]
Ciocca et al., 2016	UNIMIB2016	Food from dining hall	73/1027	Images acquired by digital camera in dining hall; segmented	[8]
Chen and Ngo, 2016	Vireo	Chinese dishes	172/110241	Images downloaded from the web	[23]

^*Proprietary database