Source: http://www.baseballpilgrimages.com/american/boston.html

Strategy: The goal was to count the number of people (players, coaches, umpires) on the field during a baseball game at Fenway Park.  When the image was analyzed, the range for number of pixels per person on the field had to be fairly small so that the people in the crowd and other objects were not included in the count.  Also, the shape of ellipses were used.

Data: It was found that 27 people were on the field during the game at Fenway.  The scale was set using the distance from home plate to first base as well (90 ft.).

Inferences: The count of people on the field was overestimated.  I believe this was due to the sizes of the players on the field compared to those in the stands.  It was difficult to determine an exact range of pixels for the program to classify as just players and not spectators at the game.