Method of accessing a spatio-temporal part of a video sequence of images
First Claim
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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.
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Abstract
The invention concerns a method and a device for accessing a spatio-temporal part of a video sequence of images compressed using a coding format implementing a prediction.
The method comprises 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 image of the video sequence, said selection spatial region including said target spatial region;
- obtaining at least one item of updating information for updating the selection spatial region that is provided for selecting compressed data in a following image of the video sequence, said updating information depending on the decoding of the compressed data corresponding to said target spatial region.
20 Citations
23 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for accessing a spatio-temporal part of a video sequence of image compressed using a coding format implementing a spatial-unit-based prediction, comprising, at a client terminal of a communication network, the steps of:
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a means for defining a target spatial region corresponding to said spatio-temporal part to access; a means for 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; a means for 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; a means for 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; a means for identifying, based on said decoding step, non-useful spatial unit or units of the compressed data that are not used to obtain the decoded part corresponding to the target spatial region in the first image; a means for 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; a means for 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.
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13. A non-transitory storage medium storing a computer-executable program causing a computer to implement 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:
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a step of defining a target spatial region corresponding to said spatio-temporal part to access, and further comprising the steps of; 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 compressed 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.
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14. 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 server device of a communication network, the steps of:
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receiving, from a remote client terminal, a request for access to said spatio-temporal part; defining a target spatial region corresponding to said spatio-temporal part identified in said request; 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; sending the obtained compressed data to the remote client terminal; receiving, from the remote client terminal, at least one item of updating information for updating the selection spatial region based on the decoding of the compressed data so obtained which correspond to said target spatial region; identifying, based on the item of updating information, spatial unit or units missing in the sent 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 the item of updating information, non-useful spatial unit or units of the compressed data that are not used to obtain the decoded part corresponding to the target spatial region in the first image; updating the selection spatial region before it is used for at least one next image of the video sequence, where the updating adds the projected missing spatial unit or units to the selection spatial region and deletes the identified non-useful spatial unit or units from the selection spatial region; obtaining next compressed data corresponding to the updated selection spatial region in the next image of the video sequence; and sending the obtained next compressed data to the remote client terminal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification