Patent Document ID: 9258622
Application ID: 13094778
Patent Status: 1

Claim One:
1. A method of accessing a spatio-temporal part of a video sequence of images compressed using a coding format implementing a spatial-unit-based prediction, the method comprising, at a client terminal of a communication network, the steps of: defining a target spatial region corresponding to said spatio-temporal part to access; obtaining compressed data corresponding to a selection spatial region in at least one first image of the video sequence, said selection spatial region including said target spatial region; decoding the compressed data corresponding to the selection spatial region in the first image to obtain a decoded part of the first image corresponding to the target spatial region in the first image; identifying, based on said decoding step, spatial unit or units missing in the compressed data to decode the whole target spatial region in the first image, and projecting the location of the missing spatial unit or units on the same image; identifying, based on said decoding step, non-useful spatial unit or units of the decompressed data that are not used to obtain the decoded part corresponding to the target spatial region in the first image; generating, based on the identified missing and non-useful spatial unit or units, at least one item of updating information for updating the selection spatial region before it is used for at least one next image of the video sequence, the item of updating information being configured to add the projected missing spatial unit or units to the selection spatial region and to delete the identified non-useful spatial unit or units from the selection spatial region; transmitting the item of updating information to a remote server storing the compressed video sequence, for the client terminal to obtain next compressed data corresponding to the updated selection spatial region in the next image of the video sequence.