All of us would have used the Google 'image' search sometime or the other...
Its functioning is not conventional in the sense 'image search' and 'web search' happen differently...
Their algorithms work differently in that the latter is concentrated around the concept of 'page rank' and 'authority' but the former does not, or more appropriately cannot...
It is technically impossible to scan a picture and check for keyword relevance, so how are the pictures thrown up...
The keyword/s is/are compared to the file name of the picture, the URL of the link in which the picture is present and presence of the keyword in the vicinity of the picture...
Not the best way to go about the task, consider an instance where a girl's picture is saved with a guy's name as the file name, giving the girl's name as the keyword will not yield any results but giving the guy's name will throw up the girl's picture effecting the appropriateness of the search...
To tackle these issues Google has gone about doing something which only Google can conjure up...
Google has come up with something called the 'GOOGLE LABELER', it is for all practical purposes a game where in you are pitted against an unknown user in a two minute 'label'ing exercise...
Once you sign in and wish to start the game the system chooses your partner randomly, once the selection is done, images are flashed on the screen and you are expected to write keywords (colors, emotions, objects, feelings) pertaining to the image that come to your mind. As and when there is a match (the first match is what is considered) you are awarded points. The longer the matched word the more points you score. Some obvious words are marked as 'off-limit words'...
Your cumulative score is saved, trust me it is addictive...
Google is getting people to work for them and whats more free of cost...
Signing off...
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