by the slat blind 3 from sunlight falling through the window 2 the camera 6 is connected to the control unit 5 using a wireless connection a schematic block diagram of the system according to the present embodiment is shown in fig2 as can be seen from fig2 the system may optionally be connected to a central building control system 8 for obtaining general control parameters such as a control preset based on temperature daylight conditions season wind etc furthermore the central control system 8 may be configured with specific control parameters for the room 1 obtained in a commissioning process the system may further or alternatively be connected with a manual controller 9 e g installed in the room 1 for allowing a user to set the tilt angle of the slats 4 and the height to which the slats 4 of the blind 3 are lowered manually if necessary the system for controlling is activated by lowering the slats 4 of the blind 3 either by a manual command using the controller 9 or by a corresponding command of the central control system 8 the control unit 5 receives the respective control command and lowers the slats 4 the control unit 5 then queries the camera 6 to obtain an image signal of the desk 7 in case direct sunlight falls.