Patent Publication Number: US-2021195300-A1

Title: Selection of animated viewing angle in an immersive virtual environment

Description:
TECHNICAL FIELD 
     The present disclosure relates generally to immersive virtual environments and in particular, to techniques for selecting viewing angles in Virtual Reality (VR) or Augmented Reality (AR) environments. 
     BACKGROUND 
     This section is intended to introduce the reader to various aspects of art, which may be related to various embodiments that are described and/or claimed below. This discussion is believed to be helpful in providing the reader with background information to facilitate a better understanding of the various aspects of the present invention. Accordingly, it should be understood that these statements are to be read in this light, and not as admissions of prior art. 
     Virtual reality (VR) and augmented reality (AR) provide immersive multimedia and computer-simulated reality. AR/VR applications can be used to simulates a user&#39;s physical presence in a virtual world that is partly real or completely imaginary. Because of the rich experiences that can be provided, VR and AR devices have gained immense popularity. This is because VR/AR can be used practically in every field to perform various functions including testing, entertaining and teaching. For example, engineers and architects can use VR/AR in modelling of new designs. Doctors can use VR/AR technologies to practice and perfect difficult operations ahead of time and military experts can develop strategies by simulating battlefield operations. VR/AR is also used extensively in the gaming and entertainment industries to provide interactive experiences and enhance audience enjoyment. 
     While VR/AR applications offer unique experiences, unfortunately, there are many drawbacks in current prior art. One particular challenge, is the restrictions imposed by VR/AR user interfaces. Current VR/AR systems are limited and mostly provide solitary experiences due to these restrictions. Conventional wisdom dictates that the notion of a solitary user, is an undesired one. In addition, like all games and experiences, environments that are shared often provide best creative results. Consequently, multiplayer and multi-shared environments are desirable that can embrace a more social VR/AR world. 
     SUMMARY 
     Additional features and advantages are realized through similar techniques and other embodiments and aspects described in detail herein. For a better understanding of embodiments with advantages and features, refer to the description and to the drawings. 
     In one embodiment, a method is provided comprising obtaining video data and metadata associated with the video data. A processor is used to obtain a viewing angle based on the metadata and processing the video data so that it can be displayed according to the viewing angle. 
     In another embodiment, a system is provided comprising a processor for receiving video data and metadata associated with the video data. The processor is configured to obtain a viewing angle based on the metadata and process the video data so that it can be displayed according to the viewing angle. 
     In yet another embodiment, a panoramic VR live video transmission is provided that receives video data and metadata and determines a favorite viewing angle according to previous user habits. The content specific information is also determined about the video data by analyzing associated metadata so that an viewing angle can be calculated by correlating said content specific information with said user favorite viewing angle. 
     In yet another embodiment, video data is received at a playback device. It then analyzes identifying information relating to said video data to determine if the video data includes a 360 video descriptor. A preferred angle of viewing is then determined relating to the video data when determined the video data has a 360 video descriptor and ultimately the video data is displayed based on preferred angle of viewing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure will be better understood and illustrated by means of the following embodiment and execution examples, in no way limitative, with reference to the appended figures on which: 
         FIG. 1  schematically represents an immersive video rendering device according to an embodiment; 
         FIG. 2  is a block diagram illustrating a Head Mounted Display device as used in AR/VR devices; 
         FIG. 3  schematically represents a functional overview of an encoding and decoding system according one or more embodiments of the disclosure; 
         FIG. 4  schematically represents a system, according to one embodiment; 
       Figure schematically represents a system, according to another embodiment; 
         FIG. 5  schematically represents a system, according to another embodiment; 
         FIG. 5  schematically represents a system, according to another embodiment; 
         FIG. 6  schematically represents a system, according to another embodiment; 
         FIG. 7  schematically represents a system, according to another embodiment; 
         FIG. 8  schematically represents a system according to another embodiment; 
         FIGS. 9A and 9B  schematically represents a system according to different alternative embodiments; 
         FIG. 10  is an example of a system such as one used for gaming according to one embodiment; 
         FIG. 11  schematically represents an immersive video rendering device according to another embodiment; 
         FIG. 12  schematically represents an immersive video rendering device according to another embodiment; 
         FIG. 13  illustrates a rendering devices with several components used as way of example according to one embodiment; 
         FIG. 14  is an illustration of an exemplary chart showing some semantic video stream descriptors; 
         FIG. 15  is an illustration of an exemplary remote according to one embodiment; 
         FIG. 16  is a flow chart illustration for a methodology that provides a selective viewing angle according to one embodiment; 
         FIG. 17  is a flow chart representation of a methodology for providing selective viewing angles using an alternate set of commands according to one embodiment; and 
         FIG. 18  is a flowchart illustration of a methodology for establishing an optimal viewing angle according to one embodiment. 
     
    
    
     Wherever possible, the same reference numerals will be used throughout the figures to refer to the same or like parts. 
     DESCRIPTION 
     It is to be understood that the figures and descriptions of the present disclosure have been simplified to illustrate elements that are relevant for a clear understanding of embodiments, while eliminating, for purposes of clarity, many other elements found in typical digital multimedia content delivery methods and systems. However, because such elements are well known in the art, a detailed discussion of such elements is not provided herein. The disclosure herein is directed to all such variations and modifications known to those skilled in the art. 
       FIG. 1  schematically represents an immersive video rendering device according to an embodiment as will be discussed in detail comprising several components only used as way of example. These components are only provided for clarity, with the understanding that in alternate embodiments these components may be modified, substituted, added and/or removed to selectively address certain needs. However, before analyzing these components more, some understanding of user interfaces for VR/AR system including Head Mounted User Interfaces should be reviewed. 
       FIG. 2  illustrates a Head Mounted Display (HMD) and user interface referenced by numerals  205  such as used in most Virtual Reality (VR) and Augmented Reality (AR) environments. HMD displays are part of some of the most popular user interface devices utilized in conjunction with immersive environments such as AR/VR. In most HMDs, the end user while wearing the HMD can turn around his head and the view is updated accordingly in the HMD. HMDs act as both input and output device where the head movement orientation is received as input and the content rendered by a host computer is displayed on the HMD. However, this leads to several challenges. One challenge is that such devices provide an often solitary experience for the user. Another challenge is that most HMDs can only be used comfortably for a short time. In addition, most HMDs require a complicated setup and need to be incorporated only with powerful computing units. 
       FIG. 3  schematically illustrates a general overview of an encoding and decoding system according to one or more embodiments. The system of  FIG. 3  is configured to perform one or more functions of the system of  FIG. 1  as will be discussed in conjunction with one another. A pre-processing module  300  may be provided to prepare the content for encoding by an encoding device  400 . The pre-processing module  300  may perform multi-image acquisition, merging of the acquired multiple images in a common space (typically a 3D sphere if directions are encoded), and mapping of the 3D sphere into a 2D frame using, for example, but not limited to, an equirectangular mapping or a cube mapping. The pre-processing module  300  may also acquire an omnidirectional video in a particular format (for example, equi-rectangular) as input, and pre-process the video to change the mapping into a format more suitable for encoding. Depending on the acquired video data representation, the pre-processing module  300  may perform a mapping space change. After being encoded, the data, which may be encoded immersive video data or 3D CGI encoded data for instance, are sent to a network interface  500 , which may be typically implemented in any network interface, for instance present in a gateway. The data are then transmitted through a communication network, such as internet but any other network may be foreseen. Then the data are received via network interface  600 . Network interface  600  may be implemented in a gateway, in a television, in a set-top box, in a head mounted display device, in an immersive (projective) wall or in any immersive video rendering device. After reception, the data are sent to a decoding device  700 . Decoded data are then processed by a player  800 . Player  800  prepares the data for the rendering device  900  and may receive external data from sensors or users input data. More precisely, the player  800  prepares the part of the video content that is going to be displayed by the rendering device  900 . The decoding device  700  and the player  800  may be integrated in a single device (e.g., a smartphone, a game console, a STB, a tablet, a computer, etc.). In another embodiment, the player  800  may be integrated in the rendering device  900 . 
     Various types of systems may be used to perform functions of an immersive display device, for rendering an immersive video for example decoding, playing and rendering. Embodiments of a system, for processing augmented reality (AR) or virtual reality (VR) content are illustrated in  FIGS. 4 to 12 . Such systems are provided with one or more processing functions, and include an immersive video rendering device which may be a head-mounted display (HMD), a tablet or a smartphone for example, and optionally include one or sensors. The immersive video rendering device may also include interface modules between the display device and one or more modules performing the processing functions. The processing functions maybe integrated into the immersive video rendering device or performed by one or more processing devices. Such a processing device may include one or more processors and a communication interface with the immersive video rendering device, such as a wireless or wired communication interface. 
     The processing device may also include a communication interface with a wide access network such as internet and access content located on a cloud, directly or through a network device such as a home or a local gateway. The processing device may also access a local storage device through an interface such as a local access network interface, for example an Ethernet type interface. In an embodiment, the processing device may be provided in a computer system having one or more processing units. In another embodiment, the processing device may be provided in a smartphone which can be connected by a wired link or a wireless link to the video to change the mapping into a format more suitable for encoding. Depending on the acquired video data representation, the pre-processing module  300  may perform a mapping space change. After being encoded, the data, which may be encoded immersive video data or 3D CGI encoded data for instance, are sent to a network interface  500 , which may be typically implemented in any network interface, for instance present in a gateway. The data are then transmitted through a communication network, such as internet but any other network may be foreseen. Then the data are received via network interface  600 . Network interface  600  may be implemented in a gateway, in a television, in a set-top box, in a head mounted display device, in an immersive (projective) wall or in any immersive video rendering device. After reception, the data are sent to a decoding device  700 . Decoded data are then processed by a player  800 . Player  800  prepares the data for the rendering device  900  and may receive external data from sensors or users input data. More precisely, the player  800  prepares the part of the video content that is going to be displayed by the rendering device  900 . The decoding device  700  and the player  800  may be integrated in a single device (e.g., a smartphone, a game console, a STB, a tablet, a computer, etc.). In another embodiment, the player  800  may be integrated in the rendering device  900 . 
     An immersive content typically refers to a video or other streamed content or images, potentially encoded on a rectangular frame that is a two-dimension array of pixels (i.e. element of color information) like a “regular” video or other form of image content. In many implementations, the following processes may be performed. To be rendered, the frame is, first, mapped on the inner face of a convex volume, also referred to as mapping surface (e.g. a sphere, a cube, a pyramid), and, second, a part of this volume is captured by a virtual camera. Images captured by the virtual camera are rendered on the screen of the immersive display device. A stereoscopic video is encoded on one or two rectangular frames, projected on two mapping surfaces which are combined to be captured by two virtual cameras according to the characteristics of the device. 
     Pixels may be encoded according to a mapping function in the frame. The mapping function may depend on the mapping surface. For a same mapping surface, various mapping functions are possible. For example, the faces of a cube may be structured according to different layouts within the frame surface. A sphere may be mapped according to an equirectangular projection or to a gnomonic projection for example. The organization of pixels resulting from the selected projection function modifies or breaks lines continuities, orthonormal local frame, pixel densities and introduces periodicity in time and space. These are typical features that are used to encode and decode videos. There is a lack of taking specificities of immersive videos into account in encoding and decoding methods. Indeed, as immersive videos are 360° videos, a panning, for example, introduces motion and discontinuities that require a large amount of data to be encoded while the content of the scene does not change. Taking immersive videos specificities into account while encoding and decoding video frames would bring valuable advantages to the state-of-art methods. 
     In another embodiment, the system includes an auxiliary device which communicates with the immersive video rendering device and with the processing device. In such an embodiment, the auxiliary device may perform at least one of the processing functions. The immersive video rendering device may include one or more displays. The device may employ optics such as lenses in front of each display. The display may also be a part of the immersive display device such as for example in the case of smartphones or tablets. In another embodiment, displays and optics may be embedded in a helmet, in glasses, or in a wearable visor. The immersive video rendering device may also include one or more sensors, as described later. The immersive video rendering device may also include interfaces or connectors. It may include one or more wireless modules in order to communicate with sensors, processing functions, handheld or devices or sensors related to other body parts. 
     When the processing functions are performed by the immersive video rendering device, the immersive video rendering device can be provided with an interface to a network directly or through a gateway to receive and/or transmit content. 
     The immersive video rendering device may also include processing functions executed by one or more processors and configured to decode content or to process content. By processing content here, it is understood functions for preparing content for display. This may include, for instance, decoding content, merging content before displaying it and modifying the content according to the display device. 
     One function of an immersive content rendering device is to control a virtual camera which captures at least a part of the content structured as a virtual volume. The system may include one or more pose tracking sensors which totally or partially track the user&#39;s pose, for example, the pose of the user&#39;s head, in order to process the pose of the virtual camera. One or more positioning sensors may be provided to track the displacement of the user. The system may also include other sensors related to the environment for example to measure lighting, temperature or sound conditions. Such sensors may also be related to the body of a user, for instance, to detect or measure sweating or heart rate. Information acquired through these sensors may be used to process the content. The system may also include user input devices (e.g. a mouse, a keyboard, a remote control, a joystick). Information from user input devices may be used to process the content, manage user interfaces or to control the pose of the virtual camera. Sensors and user input devices communicate with the processing device and/or with the immersive rendering device through wired or wireless communication interfaces. 
     Referring back to  FIG. 3 , an embodiment of the immersive video rendering device  10 , will now be described in more detail with reference to  FIG. 1 . The immersive video rendering device includes a display  101 . The display is, for example an OLED or LCD type display. The immersive video rendering device  10  is, for instance a HMD, a tablet or a smartphone. The device  10  may include a touch sensitive surface  102  (e.g. a touchpad or a tactile screen), a camera  103 , a memory  105  in connection with at least one processor  104  and at least one communication interface  106 . The at least one processor  104  processes the signals received from the sensor(s)  20 . Some of the measurements from sensors are used to compute the pose of the device and to control the virtual camera. Sensors which may be used for pose estimation include, for instance, gyroscopes, accelerometers or compasses. In more complex systems, a rig of cameras for example may also be used. The at least one processor  104  performs image processing to estimate the pose of the device  10 . Some other measurements may be used to process the content according to environmental conditions or user reactions. Sensors used for detecting environment and user conditions include, for instance, one or more microphones, light sensor or contact sensors. More complex systems may also be used such as, for example, a video camera tracking eyes of a user. In such a case the at least one processor performs image processing to perform the expected measurement. Data from sensor(s)  20  and user input device(s)  30  may also be transmitted to the computer  40  which will process the data according to the input of the sensors. 
     Memory  105  includes parameters and code program instructions for the processor  104 . Memory  105  may also include parameters received from the sensor(s)  20  and user input device(s)  30 . Communication interface  106  enables the immersive video rendering device to communicate with the computer  40 . The Communication interface  106  of the processing device may include a wireline interface (for example a bus interface, a wide area network interface, a local area network interface) or a wireless interface (such as a IEEE 802.11 interface or a Bluetooth® interface). Computer  40  sends data and optionally control commands to the immersive video rendering device  10 . The computer  40  processes the data, for example to prepare the data for display by the immersive video rendering device  10 . Processing may be carried out exclusively by the computer  40  or part of the processing may be carried out by the computer and part by the immersive video rendering device  10 . The computer  40  is connected to internet, either directly or through a gateway or network interface  50 . The computer  40  receives data representative of an immersive video from the internet, processes these data (for example. decode the data and may prepare the part of the video content that is going to be displayed by the immersive video rendering device  10 ) and sends the processed data to the immersive video rendering device  10  for display. In another embodiment, the system may also include local storage (not represented) where the data representative of an immersive video are stored, said local storage may be on the computer  40  or on a local server accessible through a local area network for instance (not represented). 
     Embodiments of a first type of system for displaying augmented reality, virtual reality, augmented virtuality or any content from augmented reality to virtual reality will be described with reference to  FIGS. 2 to 6 . In one embodiment, these are combined with a large field-of-view content that can provide a 360 degree view of a real, fictional or mixed environment. This large field-of-view content may be, among others, a three-dimension computer graphic imagery scene (3D CGI scene), a point cloud, streaming content or an immersive video or panoramic picture or images. Many terms may be used to define technology that provides such content or videos such as for example Virtual Reality (VR), Augmented Reality (AR) 360, panoramic, 4π, steradians, omnidirectional, immersive and alongside large-field-of-view as previously indicated. 
       FIG. 4  schematically illustrates an embodiment of a system configured to decode, process and render immersive videos. The system includes an immersive video rendering device  10 , one or sensors  20 , one or more user input devices  30 , a computer  40  and a gateway  50  (optional). 
       FIG. 5  schematically represents a second embodiment of a system configured to decode, process and render immersive videos. In this embodiment, a STB  90  is connected to a network such as internet directly (i.e. the STB  90  includes a network interface) or via a gateway  50 . The STB  90  is connected through a wireless interface or through a wired interface to a rendering device such as a television set  100  or an immersive video rendering device  200 . In addition to classic functions of a STB, STB  90  includes processing functions to process video content for rendering on the television  100  or on any immersive video rendering device  200 . These processing functions are similar to the processing functions described for computer  40  and are not described again here. Sensor(s)  20  and user input device(s)  30  are also of the same type as the sensor(s) and input device(s) described earlier with reference to  FIG. 2 . The STB  90  obtains the data representative of the immersive video from the internet. In another embodiment, the STB  90  obtains the data representative of the immersive video from a local storage (not represented) where the data representative of the immersive video are stored. 
       FIG. 6  schematically represents a third embodiment of a system configured to decode, process and render immersive videos. In the third embodiment, a game console  60  processes the content data. Game console  60  sends data and optionally control commands to the immersive video rendering device  10 . The game console  60  is configured to process data representative of an immersive video and to send the processed data to the immersive video rendering device  10  for display. Processing may be done exclusively by the game console  60  or part of the processing may be done by the immersive video rendering device  10 . 
     The game console  60  is connected to internet, either directly or through a gateway or network interface  50 . The game console  60  obtains the data representative of the immersive video from the internet. In another embodiment, the game console  60  obtains the rendering device  10 . Processing may be carried out exclusively by the computer  40  or part of the processing may be carried out by the computer and part by the immersive video rendering device  10 . The computer  40  is connected to internet, either directly or through a gateway or network interface  50 . The computer  40  receives data representative of an immersive video from the internet, processes these data (for example. decode the data and may prepare the part of the video content that is going to be displayed by the immersive video rendering device  10 ) and sends the processed data to the immersive video rendering device  10  for display. In another embodiment, the system may also include local storage (not represented) where the data representative of an immersive video are stored, said local storage may be on the computer  40  or on a local server accessible through a local area network for instance (not represented). 
       FIG. 7  schematically represents a fourth embodiment of a system configured to decode, process and render immersive videos the immersive video rendering device  70  is provided by a smartphone  701  inserted in a housing  705 . The smartphone  701  may be connected to internet and thus may obtain data representative of an immersive video from the internet. In another embodiment, the smartphone  701  obtains data representative of an immersive video from a local storage (not represented) where the data representative of an immersive video are stored, said local storage may be on the smartphone  701  or on a local server accessible through a local area network for instance (not represented). 
     An embodiment of the immersive video rendering device  70  is described with reference to  FIG. 11 . The immersive video rendering device  70  optionally includes at least one network interface  702  and housing  705  for the smartphone  701 . The smartphone  701  includes functions of a smartphone and a display. The display of the smartphone is used as the immersive video rendering device  70  display. Optics  704 , such as lenses, may be included for viewing the data on the smartphone display. The smartphone  701  is configured to process (for example, decode and prepare for display) data representative of an immersive video for example according to data received from the sensors  20  and from user input devices  30 . Some of the measurements from sensors may be used to compute the pose of the device and to control the virtual camera. Sensors which may be used for pose estimation include, for instance, gyroscopes, accelerometers or compasses. More complex systems, for example a rig of cameras may also be used. In this case, the at least one processor performs image processing to estimate the pose of the device  10 . Other measurements may be used to process the content according to environmental conditions or user reactions, for example. Sensors used for detecting environmental and users conditions include, for instance, microphones, light sensor or contact sensors. More complex systems may also be used such as, for example, a video camera tracking eyes of a user. In such case the at least one processor performs image processing to perform the measurement. 
       FIG. 8  schematically represents a fifth embodiment of the first type of system in which the immersive video rendering device  80  includes functionalities for processing and displaying the data content. The system includes an immersive video rendering device  80 , sensors  20  and user input devices  30 . The immersive video rendering device  80  is configured to process (e.g. decode and prepare for display) data representative of an immersive video possibly according to data received from the sensors  20  and from the user input devices  30 . 
     The immersive video rendering device  80  may be connected to internet and thus may obtain data representative of an immersive video from the internet. In another embodiment, the immersive video rendering device  80  obtains data representative of an immersive video from a local storage (not represented) where the data representative of an immersive video are stored, said local storage may be provided on the rendering device  80  or on a local server accessible through a local area network for instance (not represented). 
     An embodiment of immersive video rendering device  80  is illustrated in  FIG. 12 . The immersive video rendering device includes a display  801 , for example an OLED or LCD type display, a touchpad (optional)  802 , a camera (optional)  803 , a memory  805  in connection with at least one processor  804  and at least one communication interface  806 . Memory  805  includes parameters and code program instructions for the processor  804 . Memory  805  may also include parameters received from the sensors  20  and user input devices  30 . Memory  805  may have a large enough capacity to store data representative of the immersive video content. Different types of memories may provide such a storage function and include one or more storage devices such as a SD card, a hard disk, a volatile or non-volatile memory . . . ) Communication interface  806  enables the immersive video rendering device to communicate with internet network. The processor  804  processes data representative of the video to display images on display  801 . The camera  803  captures images of the environment for an image processing step. Data are extracted from this step to control the immersive video rendering device. 
     Embodiments of a second type of system, for processing augmented reality, virtual reality, or augmented virtuality content are illustrated in  FIGS. 9 and 10 . In these embodiments the system includes an immersive wall. 
       FIG. 9A  schematically represents an embodiment of the second type of system including a display  1000 —an immersive (projective) wall which receives data from a computer  4000 . The computer  4000  may receive immersive video data from the internet. The computer  4000  can be connected to internet, either directly or through a gateway  5000  or network interface. In another embodiment, the immersive video data are obtained by the computer  4000  from a local storage (not represented) where data representative of an immersive video are stored, said local storage may be in the computer  4000  or in a local server accessible through a local area network for instance (not represented). 
     This system may also include one or more sensors  2000  and one or more user input devices  3000 . The immersive wall  1000  may be an OLED or LCD type and may be equipped with one or more cameras. The immersive wall  1000  may process data received from the more or more sensors  2000 . The data received from the sensor(s)  2000  may, for example, be related to lighting conditions, temperature, environment of the user, such as for instance, position of objects. 
     The immersive wall  1000  may also process data received from the one or more user input devices  3000 . The user input device(s)  3000  may send data such as haptic signals in order to give feedback on the user emotions. Examples of user input devices  3000  include for example handheld devices such as smartphones, remote controls, and devices with gyroscope functions. 
     Data may also be transmitted from sensor(s)  2000  and user input device(s)  3000  data to the computer  4000 . The computer  4000  may process the video data (e.g. decoding them and preparing them for display) according to the data received from these sensors/user input devices. The sensors signals may be received through a communication interface of the immersive wall. This communication interface may be of Bluetooth type, of WIFI type or any other type of connection, preferentially wireless but may also be a wired connection. 
     Computer  4000  sends the processed data and, optionally, control commands to the immersive wall  1000 . The computer  4000  is configured to process the data, for example prepare the data for display by the immersive wall  1000 . Processing may be done exclusively by the computer  4000  or part of the processing may be done by the computer  4000  and part by the immersive wall  1000 . 
       FIG. 9B  schematically represents another embodiment of the second type of system. The system includes an immersive (projective) wall  6000  which is configured to process (for example decode and prepare data for display) and display the video content and further includes one or more sensors  2000 , and one or more user input devices  3000 . 
     The immersive wall  6000  receives immersive video data from the internet through a gateway  5000  or directly from internet. In another embodiment, the immersive video data are obtained by the immersive wall  6000  from a local storage (not represented) where the data representative of an immersive video are stored, said local storage may be in the immersive wall  6000  or in a local server accessible through a local area network for instance (not represented). 
     This system may also include one or more sensors  2000  and one or more user input devices  3000 . The immersive wall  6000  may be of OLED or LCD type and be equipped with one or more cameras. The immersive wall  6000  may process data received from the sensor(s)  2000  (or the plurality of sensors  2000 ). The data received from the sensor(s)  2000  may for example be related to lighting conditions, temperature, environment of the user, such as position of objects. 
     The immersive wall  6000  may also process data received from the user input device(s)  3000 . The user input device(s)  3000  send data such as haptic signals in order to give feedback on the user emotions. Examples of user input devices  3000  include for example handheld devices such as smartphones, remote controls, and devices with gyroscope functions. 
     The immersive wall  6000  may process the video data (e.g. decoding them and preparing them for display) according to the data received from these sensor(s)/user input device(s). The sensor signals may be received through a communication interface of the immersive wall. This communication interface may include a Bluetooth type, a WIFI type or any other type of wireless connection, or any type of wired connection. The immersive wall  6000  may include at least one communication interface to communicate with the sensor(s) and with the internet. 
       FIG. 10  illustrates another embodiment in which an immersive wall is used for gaming. One or more gaming consoles  7000  are connected, for example through a wireless interface to the immersive wall  6000 . The immersive wall  6000  receives immersive video data from the internet through a gateway  5000  or directly from internet. In an alternative embodiment, the immersive video data are obtained by the immersive wall  6000  from a local storage (not represented) where the data representative of an immersive video are stored, said local storage may be in the immersive wall  6000  or in a local server accessible through a local area network for instance (not represented). 
     Gaming console  7000  sends instructions and user input parameters to the immersive wall  6000 . Immersive wall  6000  processes the immersive video content, for example, according to input data received from sensor(s)  2000  and user input device(s)  3000  and gaming console(s)  7000  in order to prepare the content for display. The immersive wall  6000  may also include internal memory to store the content to be displayed. 
     Virtual Reality videos are basically 360 videos that enables the end user to choose his favorite angle to view content. When a 360 video is viewed in Head Mounted Displays, the end user gets an immersive experience. MPEG (Moving Picture Transport Group—standard for digital video and audio compression) transport stream (TS) is a standard container format for transmission and storage of audio, video, and Program and System Information Protocol (PSIP) data. It is used in broadcast systems such as digital video broadcasting (DVB), ATSC (Advanced Television System Committee standards), and Internet Protocol Television (IPTV). Program-specific information (PSI) is metadata about a program (channel) and part of an MPEG transport stream. Cable and Satellite (STB) receive linear subscription channels in MPEG-TS container. The proposal is to update the PSI by adding a new 360_video descriptor to the video elementary stream of the VR video PID (proportional-integral-derivative) controller (also referenced as ISO-13818/1 in one embodiment). The STB shall understand whether the video is a VR video and use the data in the 360_video descriptor to play the video in the native VR player. The native VR player application in STB uses the data from the 360_video descriptor to use the correct projection type and enable the end user to pan the video using remote control. The addition of the native VR player to STB enables end user to view VR content using TV as display device even by users who do not possess head mounted displays or devices such as the one discussed in  FIG. 1 . 
     As discussed, the system proposed here addresses the challenges mentioned above by making use of other available displays. In one embodiment, as shown in  FIG. 13 , a TV  1300  is used as a as display device that is connected to a set-top box  1310  that can be used the VR player. An existing remote control  1320 , such as the one used for the set-top box(s) can be used to pan and view the desired viewing angle of the VR content. 
     In one embodiment, the end user can choose the favorite viewing angle by using existing Left/Right/Up/Down keys in the set-top remote. For each key press, the viewing angle of the VR video shall be rotated accordingly in the corresponding direction. For Left/Right key press the rotation shall be around the y-axis, azimuth. For Up/Down key press, the rotation shall be around the x-axis, elevation. 
       FIG. 14  provides an example of a 360 degree video descriptor. The different functions are provided in the chart  1400 . The following explanations of some of the functions in the chart  1400  which are provided to ease understanding: 
     Semantic definitions of fields in video stream descriptor:
         descriptor_tag—Set to 0x37 to identify 360_video descriptor;   descriptor_length—The descriptor_length is an 8-bit field specifying the number of bytes of the descriptor immediately following descriptor_length field;
           360_video_flag—The 1-bit flag when set to ‘1’ indicates that the video elementary stream is a 360 video;   projection_type—Indicates the projection_type of 360 video projection_type field values:   
               

                                             Value   Description                          0   Spherical (Equi-rectangular)           1   Cylindrical           2   Cubic           3   Plane                        
stereo_mode—Indicates the stereo layout mode (stereo_mode field values):
 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 Value 
                 Description 
               
               
                   
                   
               
             
            
               
                   
                 0 
                 Mono 
               
               
                   
                 1 
                 Stereo Left-Right 
               
               
                   
                 2 
                 Stereo Top-Down 
               
               
                   
                   
               
            
           
         
       
     
     Heading—Heading angle of the initial view in degrees 
     Pitch—Pitch angle of the initial view in degrees 
     Roll—Roll angle of the initial view in degrees 
     full width—Width of the video frame in pixels 
     full height—Height of the video frame in pixels 
     cropped_width—Width of the video frame to display 
     cropped_height—Height of the video frame to display 
     Even though 360 degree videos capture all the degrees of the scene, there is no means to indicate the director&#39;s preferred viewing angle. This director&#39;s preferred viewing angle shall be added in the meta data of the content, for ex a new descriptor in the PMT for MPEG-TS container. 
     In one embodiment, two new functions can be provided:
         directors&#39; azimuth—Director&#39;s preferred azimuth viewing angle   director&#39;s elevation—Director&#39;s preferred elevation viewing angle       

     With the addition of director&#39;s preferred viewing angle in the meta-data, a new user interface shall be added to the remote-control, say representing a ‘chair to indicate that on pressing it the view will be taken to director&#39;s viewing angle. As discussed, however, viewing angles can also be determined in a variety of ways as captured in the following discussion as provided in  FIG. 15 . For example, a viewing angle can be determined by reviewing previous viewing habits and user history. The user history may be related to a particular user or a device. In addition, user profiles can be established to have one or more users select preferences. Such preferences can be selected based on a number of factors and categories. For example, watching a horror or mystery movie or other selection may require attention to details and therefore may have a first set of user preference associated with it. Alternatively, a selection that has expansive landscapes may opt for more zoomed out images with a second and very different viewing preference. 
     Referring back to  FIG. 13  and taking it in conjunction with descriptors provided, in one embodiment, the ‘Last’ or ‘Back’ button equivalent interface on any of the existing remote control shall be used to return back to the last user navigated viewing angle. A sample addition of the director&#39;s view interface with a ‘chair’ button (to depict director&#39;s view) is shown in an example as provided in  FIG. 15 . 
     In  FIG. 15 , example of a remote is provided at  1520  with the understanding that this is only for ease of understanding and in alternate embodiments, other user interfaces and remotes can also be provided. In this embodiment, as shown in  FIG. 15 , when the user presses ‘chair’ button sown by numerals  1550  sin the remote to watch the director&#39;s preferred viewing angle, instead of abruptly changing the viewing angle in the next frame, the set-top box shall animate from the current viewing angle to the director&#39;s viewing angle. 
     In one embodiment, this provides a smooth and short path to reach the director&#39;s viewing angle to give a gracious and immersive experience to the end user. Viewing angle for VR videos are described using azimuth [say ‘x’] and elevation [say ‘y’] angles. Angles range from 0 to 359 degrees for both azimuth and elevation. The following method shall be applied on pressing the ‘chair’ button to switch to the director&#39;s viewing angle. 
     In one embodiment as shown in  FIG. 16 , at first the last user selected viewing angle is saved at  1600 . Determination of the direction of rotation is decided based on the current viewing angle and the director&#39;s viewing angle and the direction chosen would result in the shortest path of rotation to reach the director&#39;s viewing angle as shown at  1610 . In one embodiment, this information is stored, such as in the x_offset and the y_offset for both azimuth and elevation angles. Then, for each rendered frame, the angle rotation is applied in increments of 1 degree until the director&#39;s view is reached as shown (the x portion is shown at steps  1620 ,  1630  and  1640 ; and the y portion is shown at  1650 ,  1660  and  1670 ). In this embodiment, this provides a short and animated method to change to the director&#39;s viewing angle. This animated viewing angle change will provide a smooth and immersive experience to the end user. 
     As shown in  FIG. 17 , the same method can be used when the user presses ‘Last’/‘Back’ button to go back to the last user selected viewing angle, by using last_x and last_y as the target viewing angles (except that the first step of saving the last user selected viewing angle is not required). Again, the last user selected viewing angle is saved at  1700 . Determination of the direction of rotation is decided based on the current viewing angle and the director&#39;s viewing angle and the direction chosen would result in the shortest path of rotation to reach the director&#39;s viewing angle as shown at  1710 . The information is stored as in the x_offset and the y_offset shown at  1720  to  740  and the frame is rendered at  1750  and continues being rendered further for frames for the angles x and y as shown at  1760 . provide a smooth and immersive experience to the end user. 
     This embodiment provides for adaptability of currently VR/AR content to be immersivity experienced by many users at the same time. This allows for a more sociable VR/AR immersive experience 
       FIG. 18  is a flow chart illustration according to one embodiment. In  FIG. 18  at step  1810  video data for example in the form of a video stream is received including its associated metadata. In step  1820 , a viewing angle is calculated to provide an optimal viewing angle, via a processor, by analyzing the video stream content and associated metadata. In one embodiment, as shown in step  1825 , this may include using a panoramic viewing descriptor (that has 0 to 360 degrees capability) to include an optimal viewing angle. This may include a previously calculated angle, a preferred user preference (see step  1847 ) based on a user selection or previous user habits, or alternatively one recommended by a media outlet, a director etc. In step  1827 , in one embodiment, the video stream may include a plurality of mapped frames. In this case, the processor may render each of the mapped frames of the video stream according to the optimal angle of viewing. 
     In step  1830 , the processor manipulates the video stream so it can be displayed according to said optimal viewing angle. In step  1840 , in one embodiment, the video stream will be then displayed based on the optimal angle of viewing. In one embodiment, as provided in step  1845 , a favorite viewing angle is determined by analyzing previous user viewing habits associated with the display device. As discussed above, the favorite viewing angle can be established in a variety of ways and may be substituted as the optimal viewing angle. 
     While some embodiments have been described, it will be understood that those skilled in the art, both now and in the future, may make various improvements and enhancements which fall within the scope of the claims which follow. These claims should be construed to maintain the proper protection for the invention first described.