METHODS AND DEVICES FOR CONTROLLING SPATIAL ACCESS GRANULARITY IN COMPRESSED VIDEO STREAMS
First Claim
1. A method for encoding at least one image of a video stream in a block-based scalable video format, the encoded image comprising an encoded base layer and at least one encoded enhancement layer, the method comprising:
- determining relevant blocks in the encoded base layer according to a given criterion that depends on video data; and
encoding the at least one enhancement layer into at least two distinct groups of blocks independently decodable, as a function of at least one item of information representative of the determined relevant blocks.
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Abstract
The present invention provides methods and devices for controlling spatial access granularity in images of video streams compressed according to a block-based scalable video format. Encoded images comprise an encoded base layer and at least one encoded enhancement layer. According to an embodiment of the invention, relevant blocks are determined in the encoded base layer according to a given criterion that depends on video data. The at least one enhancement layer is encoded into at least two distinct groups of blocks independently decodable, or partially decoded, as a function of at least one item of information representative of the determined relevant blocks.
29 Citations
20 Claims
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1. A method for encoding at least one image of a video stream in a block-based scalable video format, the encoded image comprising an encoded base layer and at least one encoded enhancement layer, the method comprising:
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determining relevant blocks in the encoded base layer according to a given criterion that depends on video data; and encoding the at least one enhancement layer into at least two distinct groups of blocks independently decodable, as a function of at least one item of information representative of the determined relevant blocks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A device for encoding at least one image of a video stream in a block-based scalable video format, the encoded image comprising an encoded base layer and at least one encoded enhancement layer, the device comprising:
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determining means for determining relevant blocks in the encoded base layer according to a given criterion that depends on video data; and encoding means for encoding the at least one enhancement layer into at least two distinct groups of blocks independently decodable, as a function of at least one item of information representative of determined relevant blocks.
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16. A device for decoding at least one image of a video stream in a block-based scalable video format, the encoded image comprising an encoded base layer and at least one encoded enhancement layer, the device comprising:
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determining means for determining relevant blocks in the base layer according to a given criterion that depends on video data; and decoding means for decoding at least a part of the at least one enhancement layer as a function of at least one item of information representative of determined relevant blocks. - View Dependent Claims (17, 18, 19, 20)
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Specification