A surface object comprises a surface with a boundary, the surface having a background color. At least one optical marker is provided on the surface for assisting of image processing for improving appearance of an image of the surface with the boundary. At least one optical marker includes at least one color which is lighter or darker than the background color and the color different ΔE between the background color and the at least one color of the optical marker being between ΔE=2 and ΔE=18.

A projection apparatus comprises: a first laser beam source configured to output a visible laser beam; a second laser beam source configured to output an invisible laser beam; a scan unit configured to project an image by scanning a projection surface using the visible laser beam output from the first laser beam source and the invisible laser beam output from the second laser beam source; and a control unit configured to control a timing at which the first laser beam source outputs the visible laser beam and a timing at which the second laser beam source outputs the invisible laser beam so that, in a period corresponding to a target pixel in the image, the visible laser beam is output in a first period and the invisible laser beam is output in a second period different from the first period.

A communication terminal for communicative connection to at least one other communication terminal via a network includes a receiving part configured to receive stroke data transmitted from the other communication terminal, an obtaining part configured to obtain name information that is associated with a transmission source of the stroke data under management by a management system on the network, and a display control part configured to perform control that displays an image based on the stroke data and an image based on the obtained name information in association with each other.

A projection apparatus comprises: a first laser beam source configured to output a visible laser beam; a second laser beam source configured to output an invisible laser beam; a scan unit configured to project an image by scanning a projection surface using the visible laser beam output from the first laser beam source and the invisible laser beam output from the second laser beam source; and a control unit configured to control a timing at which the first laser beam source outputs the visible laser beam and a timing at which the second laser beam source outputs the invisible laser beam so that, in a period corresponding to a target pixel in the image, the visible laser beam is output in a first period and the invisible laser beam is output in a second period different from the first period.

An image forming optical system (100) includes a first image forming unit (101) configured to form an image of a first surface (1) onto a second surface (2), a second image forming unit (102) including at least a portion of the first image forming unit (101) and configured to form an image of the second surface (2) onto a third surface (3), and a deflection unit (104) configured to deflect light from the second surface (2) toward the third surface (3). The numerical aperture of the first image forming unit (102) on the side toward the second surface (2) is larger than the numerical aperture of the second image forming unit (102) on the side toward the second surface (2).

A reading control apparatus is directed to improving convenience for a user when a reading device is caused to read a display surface of a terminal apparatus having the function of changing the size of an image to be displayed on a display device, and includes a reading unit configured to cause the reading device to read, as a reading target, the display surface, which is a surface including the display device of the terminal apparatus operating in either of a first state where an image in a first size is displayed on the display device, and a second state where the image in a second size smaller than the first size is displayed on the display device, thereby acquiring image data, and a notification unit configured to, in a case where the terminal apparatus placed on a document platen is not in the first state, execute a notification process.

A communication terminal for communicative connection to at least one other communication terminal via a network includes a receiving part configured to receive stroke data transmitted from the other communication terminal, an obtaining part configured to obtain name information that is associated with a transmission source of the stroke data under management by a management system on the network, and a display control part configured to perform control that displays an image based on the stroke data and an image based on the obtained name information in association with each other.

An image display device according to the embodiment includes a display screen which is arranged on one surface of a housing and displays a page image using a display mechanism in which scanning can be optically performed in a copy machine; and a control unit which switches a page image displayed on the display screen among the plurality of page images set as a scanning target according to an operation input of a user with respect to an operation input unit which is arranged on the other surface of the housing.

An image display device according to the embodiment includes a display screen, an operation input unit, a control unit, and a notification unit. The display screen displays an image using a display mechanism in which scanning can be optically performed in a copy machine. The operation input unit is arranged at a position of being operated in a state in which a display screen is placed on a glass original document table so as to face the glass original document table of a copy machine, and receives an operation input of a user. When a plurality of images are set to display targets in the display screen, the control unit switches an image displayed on the display screen according to the operation input of a user with respect to the input operation unit. The notification unit notifies of switching of an image when the image displayed on the display screen is switched.

An image display device according to the embodiment includes a display screen, an operation input unit, a control unit, and a notification unit. The display screen displays an image using a display mechanism in which scanning can be optically performed in a copy machine. The operation input unit is arranged at a position of being operated in a state in which a display screen is placed on a glass original document table so as to face the glass original document table of a copy machine, and receives an operation input of a user. When a plurality of images are set to display targets in the display screen, the control unit switches an image displayed on the display screen according to the operation input of a user with respect to the input operation unit. The notification unit notifies of switching of an image when the image displayed on the display screen is switched.