In this paper I will present a class of on-line games which apply the idea of Human computation (HC). HC outsources certain steps of the computation process to humans. This makes it possible to solve difficult AI problems which are to a significant extent inaccessible to present-day algorithms (such as the perception of natural scenes). The games I will present appear to be a very convenient medium for recruiting volunteers to solve these problems. The participants can have fun, at the same time helping to accomplish those tasks that are very demanding for machines, such as image labeling for web search purposes, digitising books for online use, etc. In the paper I will also present an idea for a game which will help to generate data for future psychological research.
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