30 results about "Multiple description coding" patented technology

A system and method is provided for switching between multiple description coding and scalable coding that is dependent on the network characteristics and uses forward error correction (FEC) and scalable or prioritized video.

The invention discloses an error concealment method of space-domain MDC (Multiple Description Coding). The error concealment method comprises the following steps of (1) inputting an original streaming video, and decoding the original streaming video by adopting the space-domain MDC having two descriptions; and (2) carrying out error detection on the two descriptions of the original streaming video, and judging as follows when one description is lost: a, carrying out concealment of motion information on the losing part if the losing part has time-domain correlation; b, carrying out the concealment on the losing part by adopting a space-domain interpolation method if the losing part has space-domain correlation; and c, comparing the time-domain distortion degree of the losing part with the space-domain distortion degree of the losing part: carrying out the concealment by adopting the method of step a if the time-domain distortion degree is less than the space-domain distortion degree, and carrying out the concealment by adopting the method of step b if the time-domain distortion degree is larger than or equal to the space-domain distortion degree. According to the error concealment method provided by the invention, the error concealment performance of the space-domain MDC can be enhanced.

This invention discloses a multi-description coding method based on an iterative function system, which applies a tessellated segment mode to divide an iterated function system to several parts takenas descriptions to be transmitted at the coding terminal, when receiving only one path of description information, it applies a fractal extrapolation method to resume the un-received information and re-structure an iterative function system and finally repeatedly iterates the received iterative function system to get decoded images.

The invention discloses an adaptive multimedia multipath resource distribution method in a multi-carrier communication system, which is characterized in that sub-carrier distribution is primarily determined according to channel gain status of subscriber on each sub-carrier on the basis of multi-description coding; maximum transmission rate distributed to each multi-path group by sub-carriers is computed by feature of the multi-description code, and sub-carrier distribution is regulated according to maximum transmission rate of each sub-carrier in different multi-path groups; finally power distribution is executed between sub-carriers. Using flexible decoding feature of the multi-description coding, the sub-carrier is only distributed to subscriber with higher partial channel gain in the multi-path group when distributed to one multi-path group, consequently the selection of the sub-carrier modulation order is not subjected to the limitation of subscriber with worst channel gain, so that the system spectrum efficiency is enhanced. The method supports the application on a plurality of multi-path groups, and discrete value of modulation order, thus high practicality is achieved.

The invention relates to the technical field of real-time video, and provides a bit rate adaptive adjustment system applied to a cloud fusion platform, which is characterized by comprising: a media production unit, a media distribution unit, a media transcoding unit and a media consumption unit; the media The distribution unit is electrically connected to the media production unit, the media transcoding unit and the media consumption unit. The media distribution unit of the present invention can automatically adjust the transmission bandwidth according to the result of the bandwidth detection, the whole process is extremely fast, the cycle is extremely short, and the link can be quickly restored to the state of normal transmission; the media transcoding unit only converts one video source to one channel at most. The code stream of video multi-description encoding consumes less computing resources and network resources in the system, thereby reducing hardware costs; video multi-description encoding itself has a certain ability to resist packet loss, and the media consumption unit only needs to receive a sub-description to rebuild. The entire video frame can greatly improve the smoothness of video playback.

The embodiment of the invention discloses a method for lowering the redundancy rate of multi-description coding and decoding. The method comprises the following steps: acquiring a current frame masking threshold and a previous frame masking threshold; predetermining the current frame masking threshold according the current frame masking threshold and the previous frame masking threshold so as to obtain a predetermined differential signal; carrying out primary description coding on the current frame masking threshold; and carrying out secondary description coding on the predetermined differential signal. The embodiment of the invention also discloses the method and a device for reducing the redundancy rate of multi-description coding and decoding. The embodiment of the invention can lower the code rate of multiple description coding, and solves the problem of the prior art that the redundancy rate of multiple description coding is too high.

A method of wireless communication includes: an aggregator requesting a first description substream of a multimedia service from a source on a first path; receiving confirmation that the source is available; and receiving the first substream of the service. The method includes: determining whether the quality of the first sub-stream is satisfactory; and requesting to receive the multimedia service from the same source on at least one further path. A method of wireless communication by a source device comprising: receiving a request for a multimedia service from a terminal device aggregator on a first path; sending an acknowledgment that the source is available; and in response to the request, sending on the first path first substream. The method comprises receiving a request to transmit the multimedia service from the same source to the terminal device aggregator on at least one further path.

The present invention relates to a method and apparatus to be used in designing an index assignment matrix for use in multiple description coding of an information signal. The bandwidth of the index assignment matrix is selected in dependence of transmission condition information relating to a transmission condition of a communication channel onto which a description of the information signal can be transmitted.

The invention relates to a time domain overlap transformation multi-description coding and multi-description decoding method and system based on JND (Just Noticeable Difference). The multi-description coding method comprises the steps of obtaining image information, dividing the image information into two subsets: a first subset and a second subset, generating a first description and a second description at the same time, wherein the two descriptions comprise the first subset and the second subset at the same time; for the first description, on the basis of a multi-description method, predicting the second subset through adoption of the first subset, carrying out entropy coding according to the first subset and a prediction value of the second subset, and outputting a first multi-description code stream; and for the second description, on the basis of the multi-description method, predicting the first subset through adoption of the second subset, carrying out entropy coding according to the second subset and the prediction value of the first subset, and outputting a second multi-description code stream, wherein the multi-description method comprises the step of carrying out time domain-based overlap transformation, DCT, JND-based threshold filtering and quantization processing on the two subsets in sequence.

A multi-level transform generates descriptions containing compressed data that represents source data using a description generation operation and variable support filters for compaction at each level. The initial level filters the source data and each subsequent level operates on data filtered by a prior level. The description assignment and filtering at each level may vary to create different operating points for the multi-level transform. Each operating point may have a corresponding error recovery process. In one aspect, an error recovery process encodes additional descriptions that are combined with non-erroneous description data to provide error recovery of the data in missing or damaged descriptions. In another aspect, a multi-level transform is created by combining description generation and variable support filters at the various levels.

The present invention relates to a DMB video push method based on multiple description coding, belonging to the field of DMB video push, comprising the following steps: S1: decomposing a source video into a description of a low-quality video and a description of a high-quality video, and compressing and packaging them; S2: Push the video file processed in step S1 to the receiving end by alternately pushing high and low quality videos; S3: The receiving end checks and decodes the two sub-signals pushed by the transmitting end, and then reconstructs the corresponding video for playback . The present invention decomposes the source video into two descriptions, one with high resolution and one with low resolution, and pushes the two videos in sections through the DMB system, so that the receiving end can play a rough but acceptable video in a short time, waiting After the high-quality video segment is received, it is synthesized and replaced with the corresponding low-quality segment to shorten a long blank period at the receiving end due to waiting to receive high-definition video with a large memory.