Patent ID: 7828659

Claim:
A game device, comprising: player image acquisition means for sequentially acquiring a player image representing a player; display means for displaying a game screen produced by combining the player image acquired by the player image acquisition means and a plurality of choice images; and game control means for controlling a game based on an amount of action of the player shown in a judgment area, which is an area where a choice image among the plurality of choice images is displayed; wherein the game device further comprises action range image production means for producing an action range image representing an action range of the player based on the player image sequentially acquired by the player image acquisition means, and judgment area setting means for setting the location of the judgment area in the game screen, wherein judgment area setting means moves the location of the judgment area in accordance with the content of the action range image produced by the action range image production means, wherein action range image production means: calculates a difference between a first player image and a second player image captured before the game starts; generates a differential image based on the calculated difference; and binarizes the differential image to produce the action range.