This link (dated 2012 from archive.org) might be useful: https://web.archive.org/web/20120827014645/http://www.eatthismuch.com/?
This also looks very similar: https://web.archive.org/web/20120210130034/http://www.webmd.com/diet/food-fitness-planner/default.htm
I am not sure if this qualifies as prior art, but there is an app "MealSnap" that takes a picture of food and gives you calories and such information about the food. It looks realitvly knew so may not qualify.
It also sounds like some of this conflicts with Google's image search. Which allows you to upload an image(query) and recieve search results of that ...
The method of calibrating the sensor is not novel. It is the same method used in most systems to calibrate a sensor. Here is a patent that uses this procedure for calibrating fluid flow.
“Electro-pneumatic converter calibration” , Pub # P0859302 A2, Filing Data 1993
Background Of The Invention
Electro-pneumatic converters, such as current to pressure ...
There are about 100 references listed on the patent in question. It seems unlikely that this, or anything, is closer to the patent in question than one of them.
System and method for calibration of a flow device
WO 2006020870 A1
Priority date Aug 13, 2004
Embodiments of the present invention provide a system (200) and method for rapid ...