A Method of Selecting a Reference Frame

Abstract

A method for selecting a reference frame, comprising the following steps: Step 1: Determine the target optimization rate-distortion function by comparing the solved probability of the reconstructed frame and the combined function of the distortion size between it and the current coded truth; Step 2: Calculate the distance from the current The prediction of the probability of loss of the transmitted reference frame with the coded frame step size x is multiplied by the frame loss probability to form the first item of the target optimization rate-distortion function; Step 3: Calculate and use a certain frame distance from the current coded frame as After reference, the magnitude of the distortion between two frames is multiplied by the Lagrangian multiplier λ to form the second item of the target optimization rate-distortion function; Step 4: By finding the step size value that minimizes the target optimization rate-distortion function, Get the best reference frame. The present invention can reduce the distortion that may be caused by the loss of the selected reference frame, and at the same time take into account the coding efficiency, thereby improving user experience.

Description

technical field [0001] The invention belongs to the field of video codec and video stream transmission, and in particular relates to a method for selecting a reference frame. Background technique [0002] Video communication is a commonly used communication method in modern communication, and it appears in all aspects of our lives, such as webcast, video news, video conferencing, etc. The characteristics of video information are intuitive and informative. For real-time video systems such as live broadcast or video conferencing, how to ensure real-time and efficient transmission of video streams is extremely important. In order to ensure low latency in real-time playback, there are usually only two frame types in this type of video, I and P, and B frames are not used. Existing widely used codec technologies such as H264 or HEVC usually select the previous frame as a reference frame to encode the current frame when performing inter-frame predictive coding to restore and recon...

AI Technical Summary

Problems solved by technology

Another method is FEC. FEC provides an effective way to combat packet loss by adding redundant data. Because there is no need for retransmission or reverse channel, this method is often used in real-time or multicast applications. However, if the burst packet loss length exceeds FEC The performance of FEC can be poor when the error correction capability

In addition, redundant packets usually take up more storage space and require greater bandwidth during transmission

ARQ and FEC can reduce the negative impact of network packet loss on video quality, but due to delay and bandwidth limitations, it is still necessary to consider how to further reduce the negative impact of packet loss on video experience in practical applications

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