Processing method and device for gradable video transmission
A technology of video transmission and processing device, which is applied in the field of video communication, can solve problems such as the deterioration of the signal-to-noise ratio at the receiving end, and achieve the effects of accurate energy, realization importance, and end-to-end distortion reduction
Inactive Publication Date: 2013-06-19
TSINGHUA UNIV +1
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This method takes the coefficients after DCT (Discrete Cosine Transform, Discrete Cosine Transform) as the transmission object, which is contrary to the entropy coding after DCT in practical video coding standards, and cannot be directly used in standard video streams (H.264, MPEG-2, etc.) transmission
[0008] The transmission capability of the wireless channel shows obvious time-varying characteristics. When severe fading occurs, the signal-to-noise ratio at the receiving end will deteriorate significantly.
However, the existing video transmission technology only provides a simple data protection (including peer-to-peer and non-peer-to-peer protection) and transmission mode. Source preprocessing to achieve source and channel matching
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[0053] In the scalable video transmission processing method and device of the embodiment of the present invention, the weight of the data packet is calculated according to the contribution of the data packet to the end-to-end distortion, and at the same time, through iterative adaptive extraction and resource allocation (subcarrier and energy allocation), the The optimal combination of transmitted data packets and the subcarriers and energy used to transmit them are presented in any channel state.
[0054] Before describing the embodiments of the present invention in detail, some parameters that will be involved in the specific embodiments of the present invention will be described first.
[0055] Assuming that the video segment to be transmitted is composed of N frames of images, each frame of images generates K data packets (Data Packet, DP) after being encoded by a scalable source encoder. Let the DP with the serial number l=(n-1)K+k be the kth DP of the nth frame image, an...
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The invention provides a processing method and a device for gradable video transmission. The method comprises the following steps of: grading a source encode to obtain an original data packet set to be transmitted; performing weight evaluation to obtain the weights of the data packets to be transmitted; carrying out subcarrier distribution on the data packets to be transmitted according to the decreasing sequence of the weight, wherein, in a first data packet set to be transmitted which comprises data packets to be transmitted which are distributed with distributed subcarriers, the channel quality of the subcarriers distributed to the large-weight data packets to be transmitted is better; taking the data packets from the first data packet set to be transmitted according to the decreasing sequence of the weight to form a second data packet set to be transmitted, and carrying out energy distribution, wherein during utilizing the distributed subcarrier and transmitting energy, the sourcedistortion and channel distortion of the second data packet set to be transmitted satisfy the preset multiple relationship; carrying out orthogonal frequency division multiplexing modulation on the second data packet set to be transmitted, and then sending. The invention reduces the end-to-end distortion and improves the system property.
Description
technical field [0001] The invention relates to the technical field of video communication, in particular to a scalable video transmission processing method and device applied to an OFDM communication system. Background technique [0002] Scalable Video refers to a streaming media in which a specific part of the extracted video stream can still be decoded independently or obtain a lower bit rate, or obtain a lower resolution, or obtain a lower video quality. It has a wide range of Application prospect. For example, in an increasingly complex network video application environment, code streams with different resolutions, frame rates or bit rates may need to be provided simultaneously for the same video content to meet the requirements of different terminals. If an appropriate scalable video coding method is adopted, the source only needs to be coded once (according to the highest resolution or code rate), which can meet the needs. Videos with lower resolution or quality can...
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IPC IPC(8): H04N21/23H04L27/26H04J11/00H04N7/173H04N21/2383H04N21/2662H04N21/61H04W4/06H04W52/18H04W72/04
Inventor 张彧杨峰宋健池琛王晓利张永生
Owner TSINGHUA UNIV