7917 results about "Video encoding" patented technology

A system and method for improving the coding efficiency of motion vector information in video coding. According to various embodiments, a list of motion vector predictor candidates is arranged according to predefined rules. Each motion vector also has a reference index associated with it. One of the motion vector candidates is then selected as a predictor based on predefined rules, or the selection is explicitly signaled in the bitstream. The reference index associated with the selected motion vector is used as a reference index for the current block. The reference index is predicted along with the motion vector. Such embodiments can improve the compression efficiency of modern video codecs.

A method for effectively implementing a multi-room television system includes a digital base station that processes and combines various program sources to produce a processed stream. A communications processor then responsively transmits the processed stream as a local composite output stream to various wired and wireless display devices for flexible viewing at variable remote locations. The transmission path performance is used to determine the video encoding process, and special attention is taken to assure that all users have low-latency interactive capabilities.

Techniques and tools for encoding and decoding motion vector information for video images are described. For example, a video encoder yields an extended motion vector code by jointly coding, for a set of pixels, a switch code, motion vector information, and a terminal symbol indicating whether subsequent data is encoded for the set of pixels. In another aspect, an encoder / decoder selects motion vector predictors for macroblocks. In another aspect, a video encoder / decoder uses hybrid motion vector prediction. In another aspect, a video encoder / decoder signals a motion vector mode for a predicted image. In another aspect, a video decoder decodes a set of pixels by receiving an extended motion vector code, which reflects joint encoding of motion information together with intra / inter-coding information and a terminal symbol. The decoder determines whether subsequent data exists for the set of pixels based on e.g., the terminal symbol.

A video server adaptively selects an appropriate video encoding standard and an appropriate video encoding rate for encoding video content to be downloaded to one or more video client devices over a communication network. The video server adaptively selects the video encoding standard and the video encoding rate based upon factors such as the data transmission rate of the communication network, the processing speed of the video client device, or the type of the video content to be downloaded. Once the video encoding standard and the video encoding rate are selected, video content can be transcoded prior to downloading to one or more video client devices. During the download, the video content may be adaptively transrated, such as in response to a change in the data transmission rate of the communication network.

There are provided methods and apparatus for stereoscopic video coding using scalable video coding. A scalable video encoder includes an encoder (100) for encoding at least two views corresponding to multi-view video content by, encoding a particular view of the at least two views as a base layer, and encoding each of at least one other view of the at least two views as an enhancement layer using a prediction from a lower layer corresponding to at least one of the particular view and the at least one other view. The at least two views are encoded based on a selection from among at least two of temporal, spatial, and signal to noise ratio scalability techniques.

A method of video encoding is provided that includes performing context-adaptive binary arithmetic coding (CABAC) on a plurality of syntax element values in a slice to generate a plurality of entropy-encoded syntax element values, generating an entropy slice header to identify the plurality of entropy-encoded syntax element values as an entropy slice, wherein the entropy slice header comprises context model initialization information, and outputting the entropy slice header and the plurality of entropy encoded syntax element values.

Techniques and tools for encoding and decoding video images (e.g., interlaced frames) are described. For example, a video encoder or decoder processes 4:1:1 format macroblocks comprising four 8×8 luminance blocks and four 4×8 chrominance blocks. In another aspect, fields in field-coded macroblocks are coded independently of one another (e.g., by sending encoded blocks in field order). Other aspects include DC / AC prediction techniques and motion vector prediction techniques for interlaced frames.

An improved system and method for providing improved inter-layer prediction for extended spatial scalability in video coding, as well as improving inter-layer prediction for motion vectors in the case of extended spatial scalability. In various embodiments, for the prediction of macroblock mode, the actual reference frame index and motion vectors from the base layer are used in determining if two blocks should be merged. Additionally, multiple representative pixels in a 4×4 block can be used to represent each 4×4 block in a virtual base layer macroblock. The partition and motion vector information for the relevant block in the virtual base layer macroblock can be derived from all of the partition information and motion vectors of those 4×4 blocks.

A method comprises receiving a bitstream including a sequence of access units; decoding a first decodable access unit in the bitstream; determining whether a next decodable access unit in the bitstream can be decoded before an output time of the next decodable access unit; and skipping decoding of the next decodable access unit based on determining that the next decodable access unit cannot be decoded before the output time of the next decodable access unit.

The present invention improves residue prediction by using MI even when the base layer MB is encoded in intra mode such as copying intra 4×4 mode of one 4×4 block in the base layer to multiple neighboring 4×4 blocks in the enhancement layer if the base layer resolution is lower than the enhancement layer resolution, using the intra 4×4 mode as intra 8×8 mode if the base layer resolution is lower than the enhancement layer resolution and the base layer resolution is half of the enhancement layer resolution in both dimensions, carrying out direct calculation of the base layer prediction residue used in RP, clipping of prediction residue for reducing memory requirement and tunneling of prediction residue in BLTP mode; and conditional coding of RP flag to save flag bits and reduce implementation complexity

There is disclosed a method for encoding at least two views of a video scene into a multiview video bitstream, where said views have different spatial resolutions. The method comprises prediction between pictures belonging to different views after resampling of one of these pictures. There is also disclosed a method for decoding a multiview video bitstream comprising at least two views having different spatial resolutions. The method comprises prediction between pictures belonging to different views after resampling of one of these pictures. There are also disclosed corresponding apparatuses and computer program products.

There are provided methods and apparatus for context dependent merging for SKIP / DIRECT modes for video encoding and decoding. An apparatus includes an encoder for joint coding partitions of an image region using frame partitioning and a partition merging procedure, wherein any given one of the partitions that use a coding mode with implicit coding rules is subject to being merged, with another one of the partitions, using a distinct merging rule different than that used for a coding mode with explicit coding rules.

According to one embodiment, A nonlinear editing system comprises a video encoder, an audio compressor and an engine unit. The engine unit is adapted to synchronize the video with the first alternate video and to synchronize the audio with the first alternate audio so that, where the scene of the program includes objectionable content, either (i) the video is substituted with the first alternate video, (ii) the audio is substituted with the first alternate audio, or (iii) both the video and the audio are substituted with the first alternate video and the first alternate audio.

Embodiments of the present invention relate to video coding for multi-view video content. It provides a coding system enabling scalability for the multi-view video content. In one embodiment, a method is provided for encoding at least two views representative of a video scene, each of the at least two views being encoded in at least two scalable layers, wherein one of the at least two scalable layers representative of one view of the at least two views is encoded with respect to a scalable layer representative of the other view of the at least two views.

Techniques and tools for coding / decoding of video images, and in particular, B-frames, are described. In one aspect, a video encoder / decoder determines a fraction for a current image in a sequence. The fraction represents an estimated temporal distance position for the current image relative to an interval between a reference images for the current image. The video encoder / decoder processes the fraction along with a motion vector for a first reference image, resulting in a representation of motion (e.g., constant or variable velocity motion) in the current image. Other aspects are also described, including intra B-frames, forward and backward buffers for motion vector prediction, bitplane encoding of direct mode prediction information, multiple motion vector resolutions / interpolation filters for B-frames, proactive dropping of B-frames, and signaling of dropped predicted frames.

There is disclosed a method, an apparatus, a server, a client and a non-transitory computer readable medium comprising a computer program stored therein for motion compensated video coding and decoding. Texture block motion information is used to derive disparity / depth motion information. Alternatively, disparity / depth motion information is used to derive texture block motion information.

In scalable video coding where two predictive motion vectors are calculated: one from the current layer neighboring motion vectors and one from the co-located base layer motion vectors. One of the two predictive motion vectors is chosen as the predictive motion vector for current block. A flag bit is coded to indicate which predictive motion vector is chosen only if it is not possible to infer the layer from which the predictive motion vector for the current block comes. Such inference is possible in many situations, such as when both predictive motion vectors are substantially the same, or only one of the vectors is reliable or available.

A system and method for enabling the removal of decoded pictures from a decoded picture buffer as soon as the decoded pictures are no longer needed for prediction reference and future output. An indication is introduced into the bitstream as to whether a picture may be used for inter-layer prediction reference, as well as a decoded picture buffer management method which uses the indication. The present invention includes a process for marking a picture as being used for inter-layer reference or unused for inter-layer reference, a storage process of decoded pictures into the decoded picture buffer, a marking process of reference pictures, and output and removal processes of decoded pictures from the decoded picture buffer.

A method and apparatus is disclosed herein for video encoding and / or decoding using adaptive interpolation is described. In one embodiment, the decoding method comprises decoding a reference index; decoding a motion vector; selecting a reference frame according to the reference index; selecting a filter according to the reference index; and filtering a set of samples of the reference frame using the filter to obtain the predicted block, wherein the set of samples of the reference frame is determined by the motion vector.

A network-based video encoding and decoding system encodes and decodes remotely displayed user application data on a centralized desktop computer. Remotely displayed user application data are screen captures of a browsing application run by the centralized desktop computer on user's behalf. The encoding system optimizes its encoding performance using back channel information which includes real time network capacity information and decoder feedback. The encoding system consults a back channel information manager to dynamically adjust encoding parameters. Based on the real time network capacity information received, the encoding system adjusts its capturing sampling rate. Based on encoding errors identified by the decoding system, the encoding system selectively re-send previously encoded frames / blocks, or send intra frames on demand to allow the decoding system to correct encoding errors. In response to encoding customization requests from the decoding system, the encoding system adjusts its encoding parameters to meet such requests.

Video coding efficiency is improved by jointly coding the x and y components of motion vectors with a single variable length code. The motion vector components for a block of pixels are predicted based on motion vectors of neighboring blocks of pixels. The predicted x and y components are then jointly coded by assigning a single variable length code corresponding to the pair of components, rather than a separate code for each component. If the x and y components do not have a corresponding entry in the coding table, they are coded with an escape code followed by fixed length codes.

A system, method and computer program tangibly embodied in a memory medium for implementing motion skip and single-loop decoding for multi-view video coding. In various embodiments, a more efficient motion skip is used for the current JMVM arrangement by 8×8 or 4×4 pel disparity motion vector accuracy, while maintaining the motion compensation process that is compliant with the H.264 / AVC design regarding hierarchical macroblock partitioning. Adaptive referencing merging may be used in order achieve a more accurate motion skip from one inter-view reference picture. In order to indicate whether a picture is to be used for motion skip, a new syntax element or syntax modification in the NAL unit header may be used.

A method and system is described for video encoding with multiple parallel encoders. The system uses multiple encoders which operate in different rows of the same slice of the same video frame. Data dependencies between frames, rows, and blocks are resolved through the use of a data network. Block information is passed between encoders of adjacent rows. The system can achieve low latency compared to other parallel approaches.

A method is provided that includes receiving a coded largest coding unit in a video decoder, wherein the coded largest coding unit includes a coded coding unit structure and a plurality of coded quantization parameters, and decoding the coded largest coding unit based on the coded coding unit structure and the plurality of coded quantization parameters.

A video compression method, and more particularly, a prediction method for efficiently eliminating redundancy within a video frame, and a video compression method and an apparatus using the prediction method are provided. There is provided a method for encoding video based on a multi-layer structure, including performing intra-prediction on a current intra-block using images of neighboring intra-blocks of the current intra-block to obtain a prediction residual, performing prediction on the current intra-block using an image of a lower layer region corresponding to the current intra-block to obtain a prediction residual, selecting one of the two prediction residuals that offers higher coding efficiency, and encoding the selected prediction residual.

Entropy coding and decoding techniques are described, which may be implemented separately or in combination. For example, a video encoder uses two-layer run level coding to reduce bitrate for frequency transform coefficients in a quick and efficient manner, and a video decoder uses corresponding two-layer run level decoding. This two-layer coding / decoding can be generalized to more than two layers of run level coding / decoding. The video encoder and decoder exploit common patterns in run level information to reduce code table size and create opportunities for early termination of decoding. Using zoned Huffman code tables helps limit overall table size while still providing a level of adaptivity in encoding and decoding. Using embedded Huffman code tables allows the encoder and decoder to reuse codes for 8×8, 8×4, 4×8, and 4×4 blocks.

A system and method for encoding a first picture sequence and a second picture sequence into coded pictures, with the first picture sequence and the second picture sequence being different, and with at least one coded picture of the second picture sequence being predicted from at least one picture in the first picture sequence. According to various embodiments of the present invention, signal element is encoded into a coded picture of the second picture sequence. The signal element indicates whether a picture in the first picture sequence is used for prediction of the coded picture of the second picture sequence.

A video encoder and method are provided for encoding video signal data for at least one cross-fade picture disposed between a fade-out start picture and a fade-in end picture, where the encoder portion includes a reference picture weighting factor unit for assigning weighting factors corresponding to each of the fade-out start picture and the fade-in end picture, respectively, and the method for encoding cross-fades between pictures includes identifying pictures between which a cross-fade is desired, determining appropriate end-points for the cross-fade, and encoding the end-points prior to encoding the cross-fade picture.

The present invention provides a method for transmission of a images and / or video over bandwidth limited transmission channels having varying available bandwidth, which method comprises the use of a classification algorithm for decomposing the images and / or video to be transmitted into multiple spatial areas, each area having a specific image type; detecting the image type of each of those areas separately selecting for each of those areas an image and / or video encoding algorithm having a compression ratio. The classification algorithm prioritizes each of the areas, the classification algorithm increasing the compression ratio of the image and / or video encoding algorithm dedicated to spatial areas having lower priority in case of decreasing bandwidth.