| 摘要 |
The invention relates to a method for navigation in a panoramic video sequence displayed on a user terminal. The video sequence is divided into a plurality of non-overlapping video patches each corresponding to a zone of the video sequence. The video patches required to form a zone of the panoramic video sequence to be displayed on a screen of the user terminal, called the visibility zone, are determined according to navigation commands.;According to the invention, the video patches are provided to the user terminal, for one part, via a first transmission network and, for another part, via a second transmission network distinct from said first transmission network. |
| 主权项 |
1. A method in a user terminal apparatus for navigation in a panoramic video sequence displayed on said user terminal apparatus, the panoramic video sequence being divided into a plurality of non-overlapping video portions, called video patches, each corresponding to a zone of the panoramic video sequence, each video patch having a size and a spatial position in said panoramic video sequence, the video patches required to form a zone of the panoramic video sequence to be displayed on a screen of the user terminal, called a visibility zone, being determined according to navigation commands, said method comprising:
receiving some first video patches, corresponding to a subpart of said panoramic video sequence, at said user terminal via a first transmission network, said first network being a broadcast network; receiving, according to said navigation commands and according to the position of said visibility zone in said panoramic video sequence, some second video patches, corresponding to the rest of said panoramic video sequence, at said user terminal via a second transmission network distinct from said first transmission network, said second network comprising a return channel; for each of said first and second video patches, at least one zone is defined, called a detection zone, surrounding said video patches and having a size greater than the size of said video patches, the size of the detection zone of said video patches being according to the transmission network providing said video patches; as soon as the visibility zone enters into the detection zone of a video patch from said second video patches, pre-fetching of said second video patch is required in a memory of said user terminal; and as soon as the visibility zone enters into a video patch available in said memory of said user terminal, said video patch is displayed on the screen of the user terminal. |
