Abstract: A projector system projects derivation markers (3010) together with a guarantee marker (3020) onto a projector screen, allows noise images as marker candidates, automatically generates a plurality of provisional two-dimensional projection conversion formulas, and uses the position of the guarantee marker (3020) to detect the true conversion formula from among the generated plurality of conversion formulas.

Abstract: In a projector system, a user specifies an arbitrary position on a projector screen (60) using laser light by means of a light pen (30). A PC (10) detects the continued specification of the same position for a prescribed amount of time on the basis of an acquired image of an optical receiver (40). After the prescribed amount of time elapses, the PC (10) generates an ON flag signal equivalent to the click button operation of a mouse.

Abstract: Disclosed herein is an authentication system offering high degrees of security and convenience by use of two storage media. An automatic log-in system (100) requests a server (110) to perform a user authentication process using card-specific information (101) retrieved from an IC card (10) and password information (102) from a portable memory (11). The server (110) authenticates the user by acquiring a user ID and a password using the card-specific information (101) and password information (102). The card-specific information (101) and password information (102) constitute authentication request information, and the user ID and password make up authentication information. Following successful authentication of the user, the server (110) allows the user to log in; in case of unsuccessful authentication, the server (110) denies log-in.

Abstract: Disclosed herein is an authentication system offering high degrees of security and convenience by use of two storage media. An automatic log-in system (100) requests a server (110) to perform a user authentication process using card-specific information (101) retrieved from an IC card (10) and password information (102) from a portable memory (11). The server (110) authenticates the user by acquiring a user ID and a password using the card-specific information (101) and password information (102). The card-specific information (101) and password information (102) constitute authentication request information, and the user ID and password make up authentication information. Following successful authentication of the user, the server (110) allows the user to log in; in case of unsuccessful authentication, the server (110) denies log-in.