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Packet-loss resistance preprocessing and recovery method for wireless network video stream

A technology of wireless network and recovery method, which is applied in the direction of digital video signal modification, image communication, selective content distribution, etc. It can solve the problems of delay increase and affect the user experience of real-time streaming media service video conferencing, etc., to achieve high video quality, Improve the performance of the video experience

Inactive Publication Date: 2014-07-09
NANJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

In some wireless environments with harsh network environments, retransmission of lost packets still cannot fully restore all lost packets, and multiple retransmissions of the same packet will lead to a significant increase in delay, seriously affecting users of real-time streaming services such as video conferencing to experience

Method used

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  • Packet-loss resistance preprocessing and recovery method for wireless network video stream
  • Packet-loss resistance preprocessing and recovery method for wireless network video stream
  • Packet-loss resistance preprocessing and recovery method for wireless network video stream

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Embodiment Construction

[0030] The technical solution of the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0031] like image 3 As shown, the wireless network video stream anti-packet loss preprocessing and recovery method of the present invention comprises the following steps:

[0032] 1) After collecting a frame of original video image, the sending end divides the original video image into several sub-pictures, so that adjacent pixels in the original picture will be separated into different sub-pictures.

[0033] 2) The sending end uses the H.264 / AVC standard for video encoding of each sub-picture obtained in step 1), divides the encoded data stream into data packets of a certain size suitable for transmission on the network, and marks the data packets The header that records the sub-picture division method, sub-picture number and pixel position field provides necessary reference information for the receiving end to perform...

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Abstract

The invention discloses a packet-loss resistance preprocessing and recovery method for a wireless network video stream. Before encoding is carried out, a video is preprocessed through the packet-loss resistance preprocessing and recovery method, and the packet-loss resistance capacity of the video in the network transmission process is improved. The packet-loss resistance preprocessing and recovery method comprises the steps that adjacent pixels in a video image are separated to be distributed to different sub-images so as to be encoded; when packet loss is detected at a video stream receiving end, image distortion caused by the packet loss is restored to the maximum extent through interpolation carried out on information of pixels around lost pixels according to the redundancy characteristic of information of the adjacent pixels, and video stream media service quality is improved.

Description

[0001] technical field [0002] The invention belongs to the field of wireless network streaming media transmission, and relates to a video source preprocessing and packet loss recovery method for solving serious degradation of video quality in an environment with bad network and severe packet loss. [0003] Background technique [0004] With the popularization of broadband network and the development of multimedia technology, the application of streaming media technology is becoming more and more extensive, such as digital broadcasting services, video conferencing services, video-on-demand services, IPTV, mobile streaming media services, etc. The common feature of these services is that after the multimedia data is segmented, encapsulated and packaged, the data is distributed through the underlying communication network. Due to the unreliability of the transmission of the underlying network, there will inevitably be errors and loss of data packets. At this time, this prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/647H04N21/6437H04N19/65
Inventor 朱晓荣吴文青赵亚南钱超徐杰
Owner NANJING UNIV OF POSTS & TELECOMM
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