摘要:
An example method of decoding video data includes determining a palette for decoding a block, the palette including entries each having a respective palette index, determining a reference run of palette indices for first pixels of the block, and determining a current run of palette indices for second pixels of the block, based on the reference run. Determining the second plurality of palette indices includes locating a reference index of the reference run, the reference index being spaced at least one line from an initial index of the current run, determining a run length of the reference run, a final index of the reference run being separated from the initial index of the current run by at least one index, copying the palette indices of the reference run as the current run of palette indices, and decoding pixels of the copied current run using the palette.
摘要:
A multi-layer video decoder is configured to determine, based on a list of triplet entries, whether the multi-layer video decoder is capable of decoding a bitstream that comprises an encoded representation of the multi-layer video data. The number of triplet entries in the list is equal to a number of single-layer decoders in the multi-layer video decoder. Each respective triplet entry in the list of triplet entries indicates a profile, a tier, and a level for a respective single-layer decoder in the multi-layer video decoder. The multi-layer video decoder is configured such that, based on the multi-layer video decoder being capable of decoding the bitstream, the multi-layer video decoder decodes the bitstream.
摘要:
A method and apparatus for palette coding of a block of video data using a candidate prediction mode list with syntax redundancy removed are disclosed. In one embodiment, whether a redundant prediction mode exists in the candidate prediction mode list for the current samples of the current block is determined based on the candidate prediction mode list and the previous prediction mode associated with the previous samples. If the redundant prediction mode exists in the candidate prediction mode list, the redundant prediction mode is removed from the candidate prediction mode list to generate a reduced candidate prediction mode list. In another embodiment, whether a redundant predictor exists in a candidate predictor list for a current sample of the current block is determined based on a condition related to one or more predictors for the current sample of the current block.
摘要:
Method and system for embedding information and authenticating a H.264 video using a digital watermark. It comprises a watermarking and H.264 video stream generation module (100) for embedding a watermark in non-entropy-coded H.264 syntax elements (H.264 SE ), processing each frame j to pseudorandomly determine whether a given macroblock is a candidate macroblock for conveying the watermark and check whether a determined set of conditions to watermark a selected coefficient (COEFS) of a selected block (BLOCKS) of the candidate macroblock are met, which are met when the candidate macroblock is a 4×4 intra coded macroblock (I4x4) and the selected block of the candidate macroblock to convey the watermark belongs to a predefined set of candidate blocks and the intra prediction modes of its successive adjacent blocks do not take as input the value of the selected block. The module (100) then embed the watermark in the selected coefficient (COEFS) of the selected block (BLOCKS) meeting the set of conditions.
摘要:
Adaptive methods and apparatuses include compressing, recompressing, decompressing, and transmitting/storing digitized media data, such as text, audio, image, and video. Methods may include partitioning data; transforming partitioned data; analyzing partitioned data; organizing partitioned data, predicting partitioned data; partially or fully encoding partitioned data partially or fully decoding partitioned data, and partially or fully restructuring the original data.
摘要:
A scalable video decoder is described which is configured to reconstruct a base layer signal from a coded data stream to obtain a reconstructed base layer signal; and reconstruct an enhancement layer signal comprising spatially or temporally predicting a portion of an enhancement layer signal (360), currently to be reconstructed, from an already reconstructed portion of the enhancement layer signal to obtain an enhancement layer internal prediction signal (34); forming (41), at the portion (28) currently to be reconstructed, a weighted average of an inter-layer prediction signal (39) obtained from the reconstructed base layer signal (200), and the enhancement layer internal prediction signal to obtain an enhancement layer prediction signal (42) such that a weighting between the inter-layer prediction signal and the enhancement layer internal prediction signal varies over different spatial frequency components; and predictively reconstructing (52) the enhancement layer signal using the enhancement layer prediction signal.
摘要:
The invention relates to a method and an apparatus for estimating the perceived quality of a digital video signal, preferably in the context of video streaming services such as Internet Protocol Television (IPTV) or Video on Demand (VoD), and in particular for content-dependent estimations of the perceived quality of a digital video signal by providing content-complexity parameters, and by controlling existing or future parameter-based video quality estimation methods by the provided content-complexity parameters. The invention is designed for encrypted video streams, but also works on non-encrypted video streams.
摘要:
L'invention concerne un procédé de codage d'au moins une image découpée en partitions, ledit procédé mettant en œuvre les étapes de : - prédiction (C2) des données d'une partition courante en fonction d'au moins une partition de référence déjà codée puis décodée, délivrant une partition prédite; - détermination (C6) d'un ensemble de données résiduelles par comparaison de données relatives à la partition courante et à la partition prédite, lesdites données résiduelles étant associées respectivement à différentes informations numériques destinées à subir un codage entropique. Préalablement à l'étape d'élaboration d'un signal contenant lesdites informations codées, il est procédé aux étapes suivantes : - détermination (C71), à partir dudit ensemble de données résiduelles déterminé, d'un sous-ensemble contenant des données résiduelles aptes à être modifiées, - calcul (C8) de la valeur d'une fonction représentative des données résiduelles dudit sous-ensemble déterminé, - comparaison (C9) de ladite valeur calculée à une valeur d'au moins une desdites informations numériques, - en fonction du résultat de ladite comparaison, modification (C10) ou non d'au moins une des données résiduelles dudit sous-ensemble, - en cas de modification, codage entropique (C20) de ladite au moins une donnée résiduelle modifiée.
摘要:
L'invention concerne un procédé de codage d'au moins une image découpée en partitions, une partition courante à coder contenant des données dont au 10 moins une donnée est affectée d'un signe. Un tel procédé de codage est caractérisé en ce qu'il met en œuvre, pour ladite partition courante, les étapes suivantes : - calcul (S3) de la valeur d'une fonction représentative des données de ladite partition courante à l'exclusion dudit signe, 15 - comparaison (S4) de ladite valeur calculée à une valeur prédéterminée dudit signe, - en fonction du résultat de ladite comparaison, modification (S5) ou non d'au moins une des données de la partition courante, - en cas de modification, codage (S20) de ladite au moins une 20 donnée modifiée.