Abstract:
A method for operating virtual reality glasses involves displaying at least one virtual object from a first virtual viewing position by the virtual reality glasses and displaying the virtual object and a first position symbol at a point corresponding to the first virtual viewing position and at least one further position symbol at a point corresponding to a further virtual viewing position by an external display unit. If a predetermined confirmation action in relation to the further position symbol displayed on the display unit has been detected, a virtual position change is performed by the virtual reality glasses from the first virtual viewing position to the further virtual viewing position, whereupon the virtual object is displayed from the further virtual viewing position by the virtual reality glasses.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is based on and hereby claims priority to German Application No. 10 2014 009 303.4 filed on Jun. 26, 2014, the contents of which are hereby incorporated by reference. 
     BACKGROUND 
     The invention relates to a method for operating virtual reality glasses and a system with virtual reality glasses. 
     Virtual reality glasses are a certain form of a so-called head-mounted display, which is a visual output device that is worn on the head. It presents images on a display screen close to the eyes or projects it directly onto the retina. Virtual reality glasses also have sensors for detecting head movements. This enables the display of the computed illustration to be adjusted to the movements of the wearer of the glasses. As a result of the physical proximity, the displayed image areas of the head-mounted display appear considerably larger than the free-standing display screens and in the extreme case even cover the entire field of view of the user. Because the display follows a head movement of the wearer as a result of the head mounting, the wearer has the sensation of moving directly in a landscape generated by a computer. 
     A virtual reality can thus be displayed by such virtual reality glasses, wherein the representation and simultaneous perception of the reality in its physical properties in an interactive virtual environment that is computer generated in real time is usually referred to as a virtual reality. 
     For example, it can be that a person that is not currently wearing the virtual reality glasses wishes to have an influence on the displayed content of the virtual reality glasses that are currently being worn by another person. 
     SUMMARY 
     One possible object is to provide a method for operating virtual reality glasses and a system with virtual reality glasses, by which an external influence on content displayed by the virtual reality glasses is enabled in a particularly simple way. 
     The inventors propose a method for operating virtual reality glasses which comprises:
         displaying at least one virtual object from a first virtual viewing position by the virtual reality glasses;   displaying the virtual object and a first position symbol at a point corresponding to the first virtual viewing position and at least one other position symbol at a point corresponding to another virtual viewing position by an external display unit;   if a predetermined confirmation action in relation to the other position symbol displayed on the display unit has been recorded: carrying out a virtual position change by the virtual reality glasses from the first virtual viewing position to another virtual viewing position, following which the virtual object is displayed from the other virtual viewing position by the virtual reality glasses.       

     It is preferably provided that a viewing angle to the virtual object is adjusted according to a detected orientation of the virtual reality glasses and hence to the orientation of the head of a wearer of the virtual reality glasses. A wearer of the virtual reality glasses can thus cause the display of the virtual object from diverse viewing angles, initially only starting from the first virtual viewing position. 
     If an outside person, i.e. a person that is not wearing the virtual reality glasses, wants to influence the virtual viewing position from which the wearer of the virtual reality glasses can view the virtual object, it is easily possible for said external person to effect a virtual position change using the virtual reality glasses by the proposed method by carrying out the predetermined confirmation action in relation to the other position symbol displayed on the display unit. Consequently, the wearer of the virtual reality glasses is moved within the displayed virtual reality from the first virtual viewing position to the further virtual viewing position, so that the wearer of the virtual reality glasses now has the virtual object displayed from the further observation position. This enables an external influence to be exerted in a simple way on the content displayed by the virtual reality glasses. 
     In an advantageous embodiment it is provided that the first position symbol and the further position symbol are displayed differently by the display unit. As a result it is made known in a simple way to an operator of the display unit from which of the two virtual viewing positions the virtual object is currently being displayed to the wearer of the virtual reality glasses. 
     According to another advantageous embodiment, it is provided that the virtual object and the position symbols are displayed in a top view by the display unit. The result of this is that an operator of the display unit can identify particularly clearly where the respective virtual viewing positions are located in relation to the displayed virtual object. In particular, if besides the first and the further position symbols still more position symbols are provided and displayed, this type of representation contributes to a particularly clear recognition of the content displayed by the virtual reality glasses. 
     In another advantageous embodiment, it is provided that by the virtual reality glasses the further or a further position symbol is displayed at a point corresponding to the further virtual viewing position. The wearer of the virtual reality glasses can thus also easily identify that there is at least one further observation position from which he can view the virtual object besides the first virtual viewing position from which he is currently being shown the virtual object. 
     According to another advantageous embodiment, it is provided that the display unit is of a contact sensitive form, wherein the virtual position change is carried out if the display unit has been touched at the point at which the further position symbol is displayed for at least a predefined confirmation period as the predetermined confirmation action. For example, the display unit can be part of a so-called tablet computer comprising a capacitive display unit. Therefore to bring about the virtual position change the operator of such a tablet computer only has to touch the further displayed position symbol for at least a specified confirmation period, for example two or three seconds. For example, the specified confirmation period can also be individually adjusted by an operator at the display unit. 
     In another advantageous embodiment, it is provided that the further position symbol displayed by the virtual reality glasses is visually highlighted once the display unit has been touched for at least a specified selection period at the point at which the further position symbol is displayed by the display unit, wherein the selection period is shorter than the confirmation period. In the case of a tablet computer, an operator of the tablet computer can thus for example tap briefly on the further position symbol, whereby the further position symbol displayed by the virtual reality glasses is visually highlighted. The selection period is thereby determined to be the usual length of a tapping process for a tablet computer, for example a tenth of a second, a twentieth of a second or similar. The wearer of the virtual reality glasses is simply advised of the further virtual viewing position in the virtual reality displayed to him by the visual highlighting of the position symbol displayed by the virtual reality glasses. For example, he can cause the virtual position change himself by a suitable specified control action if he so wishes. 
     A further advantages embodiment provides that once touching of the display unit that is maintained over the selection period has been detected, an animation is displayed by the display unit and/or the virtual reality glasses that identifies a remaining further touch period until the virtual position change is carried out, as long as the display device continues to be touched. Thus for example if the user of the display unit should have briefly tapped on the display unit, whereby the highlighting of the position symbol by the virtual reality glasses is carried out, then he can leave his finger on the display unit for longer, whereby said animation is displayed. For example, the position symbol can comprise an annular part that becomes increasingly smaller with increasing touch period until finally the confirmation period has been exceeded and the virtual position change takes place. Alternatively or in addition, it is also possible that for example an hourglass, a countdown or similar is displayed, by which both the operator of the display unit and also the wearer of the virtual reality glasses are visually notified of how long it will be until the eventual virtual position change occurs. In particular, the wearer of the virtual reality glasses is thus not surprised by a very sudden virtual position change, instead of which he can already be prepared. 
     In another advantageous embodiment, it is provided that when carrying out the virtual position change the virtual object displayed from the first virtual viewing position by the virtual reality glasses is faded out over a predetermined period, especially one second, and the virtual object displayed from the further virtual viewing position by the virtual reality glasses is faded in over a further predetermined period, especially one second. The fade-out and fade-in times can also be varied during this. In other words, it is also advantageously provided that a type of smooth transition of the displayed virtual object takes place when carrying out the virtual position change. As a result, disorientation and the sensation of an unintentional loss of control on the part of the wearer of the virtual reality glasses is counteracted. 
     Preferably, in this connection a virtual aperture is closed for fading out the virtual object and the virtual aperture is opened again for fading in the virtual object. A type of iris effect, such as when closing an iris-like camera aperture, is virtually faded in order to cause the smooth transition during the virtual position change. 
     According to another advantageous embodiment, it is provided that a motor vehicle is displayed as the virtual object. This brings with it among other things the advantage that car dealerships no longer have to maintain a large range of versions of motor vehicles with diverse equipment. Instead, a respective desired configuration of a customer can be displayed particularly realistically in a simple way by using the virtual reality glasses, wherein a salesperson can also easily exert an influence, using the method explained, on the virtual viewing positions from which the customer views the current configured vehicle. 
     The inventors also propose a system that comprises virtual reality glasses that are designed to display at least one virtual object from a first virtual viewing position. Moreover, the system comprises an external display unit that is designed to display the virtual object and a first position symbol at a position corresponding to the first virtual viewing position and at least one further position symbol at a position corresponding to a further virtual viewing position. The system further comprises a control device that is designed to activate the virtual reality glasses to carry out a virtual position change from the first observation position to the further observation position, whereupon the virtual object is displayed from the further virtual viewing position by the virtual reality glasses if a predetermined confirmation action relative to the further position symbol displayed on the display unit has been detected. Advantageous embodiments of the method are to be considered as advantageous embodiments of the system, wherein the system especially carries out the method. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other objects and advantages of the present invention will become more apparent and more readily appreciated from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  shows a schematic representation of a system with virtual reality glasses for displaying a virtual motor vehicle; 
         FIG. 2  shows a perspective view of a sales point in a car dealership, in which the system shown in  FIG. 1  is used; 
         FIG. 3  shows a representation of a virtual motor vehicle that is displayed by the virtual reality glasses from a first virtual viewing position; 
         FIG. 4  shows a top view of a tablet computer forming part of the system, wherein the motor vehicle is displayed in a top view on the display of the tablet computer; 
         FIG. 5  shows the motor vehicle displayed by the virtual reality glasses, wherein the motor vehicle is displayed from a further virtual viewing position in this case; and 
         FIG. 6  shows a new representation of the display on the tablet computer, wherein the changed virtual viewing position is identified on the tablet computer. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. 
     An overall system identified by  10  for the representation of virtual reality content is shown in a schematic representation in  FIG. 1 . The system  10  comprises virtual reality glasses  12 , which in the present case are designed to display a virtual motor vehicle. Moreover, the system  10  comprises an external display unit  14  in the form of a tablet computer, which is designed to additionally display the motor vehicle displayed by the virtual reality glasses  12 . The system  10  further comprises a remote controller  16 , by which the virtual reality glasses  12  can be controlled. The remote controller  16  and the tablet computer  14  are coupled to the virtual reality glasses  12  for data communications by a control device  18 . The control device  18  can be integrated within the tablet computer  14  in this case. The control device  18  is designed to activate the virtual reality glasses  12  to carry out a virtual position change, which will be discussed in more detail below. 
     In  FIG. 2  a sales point  20  is shown that is located in a car dealership. A potential customer  22  is wearing the virtual reality glasses  12  and sitting opposite a salesperson  24 . The tablet computer  14  is in front of the salesperson  24  here, wherein the salesperson  24 , using the tablet computer  14 , can influence which virtual viewing position the customer  22  can use to display a virtual motor vehicle by the virtual reality glasses  12 . 
     In  FIG. 3  said virtual motor vehicle  26  is shown as it would be shown by the virtual reality glasses  12  from a first virtual viewing position. 
     Using the virtual reality glasses  12 , a position symbol  32  is also shown in the virtual environment  30  shown here. Said position symbol  32  is disposed in this case at a point within the virtual environment  30  corresponding to another viewing position of the virtual motor vehicle  26 . The customer  22  can change the viewing angle of the motor vehicle  26  by tilting his head, wherein in doing so the virtual viewing position remains fixed, however. In other words, the customer  22  does not move within the virtual environment  30 , instead of which by head movements he can only move his view to the left and right or up and down within the virtual environment  30 . 
     Once the customer  22  lightly taps the remote controller  16 , a selection symbol  34  is faded in. He can for example also move the symbol within the virtual environment  30  using tilting movements of his head. Once he has arranged the selection symbol  34  on the position symbol  32  and then in turn pressed a button on the remote controller  16 , the customer  22  can carry out a virtual position change. Then the motor vehicle  26  will be displayed to him from the further virtual viewing position, which is located at the point where the position symbol  32  is shown according to  FIG. 3 . 
     However, the situation can also occur for example in which the salesperson  24  wishes to change the virtual viewing position of the customer  22  himself or at least wishes to advise the customer  22  of further virtual viewing positions. 
     The tablet computer  14  is represented In  FIG. 4 . The virtual motor vehicle  26  is shown here in a top view, wherein apart from the position symbol  32  a further position symbol  36  is displayed. The symbol  36  corresponds here to the first virtual viewing position shown in  FIG. 3 . The position symbol  32  corresponds to the position symbol  32  shown in  FIG. 3 . In this case the position symbol  36  is for example shown in a different color from the position symbol  32 , so that it can easily be seen by the salesperson  24  that the virtual motor vehicle  26  is currently being displayed from the first virtual viewing position—as illustrated in  FIG. 3 . 
     If the salesperson  24  now taps briefly on the position symbol  32 , for example with his index finger, then the position symbol  32  displayed by the virtual reality glasses  12  is visually highlighted. For example, the position symbol  32  can be shown flashing; alternatively it would also be conceivable that a type of light beam is radiated vertically upwards within the virtual environment  30  starting from the position symbol  32  or similar. In any case the customer  22  will be visually advised by the visual highlighting of the position symbol  32 , so that the salesperson  24  can make the customer  22  aware by vision alone that he wishes to draw the customer&#39;s  22  attention to a further viewing position for viewing the vehicle  26 . 
     The customer  22  can then for example, as previously described, independently move the selection symbol  34  over the visually highlighted position symbol  32  and confirm the virtual position change. 
     Alternatively, it is also possible that the salesperson  24  brings about the virtual position change actively. For this he only has to keep the touched position symbol  32  contacted for slightly longer. It can thereby be provided that the position symbol  32  displayed by the tablet computer  14  and/or the position symbol  32  displayed by the virtual reality glasses  12  is animated. Both the customer  22  and also the salesperson  24  thus see that a virtual position change is imminent. 
     Alternatively or additionally, it is also possible that a further animation is displayed by the virtual reality glasses  12  and/or by the tablet computer  14 . For example, it would be conceivable that a type of countdown is displayed, so that both the salesperson  24  and the customer  22  can know that the virtual position change takes place after expiry of the countdown. 
     The virtual motor vehicle  26  is again represented in  FIG. 5 . In the present case, the virtual position change from the first observation position to the further observation position shown here has already been carried out. The customer  22  is thus now looking at the virtual motor vehicle  26  at an angle from the rear and from the side. The virtual position change is also displayed to the salesperson  24  on the tablet computer  14 . As can be seen in  FIG. 6 , the position symbol  32  is now visually highlighted on the tablet computer  14  compared to the position symbol  36  displayed thereon, so that the salesperson  24  can easily see that the virtual position change has been carried out. 
     During the virtual position change it can be provided that a type of smooth crossfade takes place from the representation shown in  FIG. 3  to the representation shown in  FIG. 5 . In this case it can for example be provided that the motor vehicle  26  displayed according to  FIG. 3  by the virtual reality glasses  12  from the first virtual viewing position is slowly faded out and subsequently the motor vehicle  26  displayed according to  FIG. 5  from the further virtual viewing position is slowly faded in again. In order to fade out the virtual motor vehicle  26 , for example, a type of virtual aperture can be closed and in order to fade in the virtual motor vehicle  26  the virtual aperture can be opened again. This enables an unintentional disorientation or sudden surprising of the customer  22  to be avoided. 
     Moreover, it is possible that yet another position symbol that is not shown here is displayed within the virtual environment  30  and on the tablet computer  14 . In particular, the further virtual viewing positions associated with the further position symbols can be preferred positions specified by an automobile manufacturer or even by a car dealership, from which it is particularly desirable from the salesperson&#39;s point of view to show the motor vehicle  26  to a potential customer. Using the method and the system  10  described, particularly simple control of the virtual viewing position of a customer  22  wearing virtual reality glasses  12  is possible. 
     The invention has been described in detail with particular reference to preferred embodiments thereof and examples, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention covered by the claims which may include the phrase “at least one of A, B and C” as an alternative expression that means one or more of A, B and C may be used, contrary to the holding in Superguide v. DIRECTV, 69 USPQ2d 1865 (Fed. Cir. 2004).