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Google Image Labeler
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Google Image Labeler was a feature, in the form of a game, of Google Images that allowed the user to label random images to help improve the quality of Google's image search results. It was online from 2006 to 2011.

Luis von Ahn developed the ESP Game,[1] a game in which two people were simultaneously given an image, with no way to communicate, other than knowing the matching label for each picture or the pass signal. The ESP Game had been licensed by Google in the form of the Google Image Labeler and launched this service, as a beta on August 31, 2006.[citation needed]

Players noticed various subtle changes in the game over time. In the earliest months, through about November 2006, you could see your partner's guesses during play by mousing over the image. When the "congenita abuse" started (see below) you could see if your partner was using those terms, while the game was underway. The game was changed so that only at the end of the game could you click "see partner's guesses" and learn what he or she had typed. "Congenita abuse" was finally stopped by changes in the structure of the game in Feb. 2007 (see below). During the first few months of 2007 regular players grew to recognize a group of images that signified a "robot" partner, always with the same labels in the same order. This appeared to have changed as of about March 13, 2007. Suddenly most of the images seen were brand new, and the older images came with extensive off-limits lists.[citation needed]

By May 2007, there had been fundamental and substantial changes made to the game. Instead of 90 seconds, players had 2 minutes. Instead of 100 points per image, the score was varied to reward higher specificity. "Man" might get 50 points whereas "Bill Gates" might get 140 points. On August 7, 2007 another change was made. Instead of simply showing the point values of each match as the match occurs, the value of each match was shown next to the matching word at the end of the game. This made it much easier to see the exact value of specific versus general labeling. A further change was observed on October 15, 2007. The new version was put into place and then seemed to have been withdrawn. In the new version you saw only the image you were labeling, whereas in the old version the images were collected in the lower part of the screen as you played. Other changes were subtle; for example, the score was in green letters in the new version and red in the old. The most significant change was that the clock froze during the image change, and that time used to be essentially subtracted from the two minutes of play. The changes appeared to have gone into full effect on October 18, 2007.[citation needed]

In September 2011, Google announced it would discontinue a number of its products, including Google Image Labeler, Aardvark, Desktop, Fast Flip, and Google Pack.[2] The game ended on September 16, 2011, to the discontent of many of its users.[citation needed] The idea of the game survives as an art annotation game in.

The user was randomly paired with a partner who was online and using the feature. Users could be registered players who accumulated a total score over all games played, or guests who just played for one game at a time. Note that players came from around the world, some practicing their English, and both American and British English would be encountered (soccer vs. football). When an uneven number of players were online, a player would play against a prerecorded set of words.
The current rules follow. For changes in the rules, see the history section. Over a 2 minute period, the user and his/her partner were shown the same set of images and asked to provide as many labels as possible to describe each image they saw. When the user's label matched the partner's label, both would earn points and move on to the next image until time runs out. It was possible to pass on an image but both users would have to agree to do this. The score was variable from 50 to 150 depending on the specificity of the answer. The 150 score was rare, but 140 points were awarded for a name or specific word, even if the word was spelled out in the image. Terms with low specificity like "trees" or "man" earned only 50 points. There was never any screening for correctness, so that if both players typed "Jupiter" for an image of Saturn, they would presumably both get 140 points.
Labels that had been agreed on by previous users would show on an "off limits" list and could not be used in that round. Some players thought that the game staggered appearance of the images, and that sometimes it took the first words typed by one player to form an "off limits" list for the other player. In other words, the off limits words might be unilateral, asymmetrical. This would explain the rather frequent circumstance when it seemed a partner couldn't think of words like "car," "bird," or "girl." Very rarely, at the end of the match it would become obvious that one image was different for the two players. Perhaps this was simply an error, or perhaps it was a test to see how quickly people would pass when their descriptions did not match, but it may also have been a mechanism implemented to view cheaters, if the words for the different images were similar. At times, one user's computer would fail to load a new image, or continue to display the previous image shown. Times likes these also called for a mutual "pass" on the part of both players.

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