A long reference frame selection method based on rate-distortion optimization and frame loss prediction
A rate-distortion optimization and reference frame technology, applied in the field of video coding and decoding, can solve problems such as occupation, more storage space, and large bandwidth
Active Publication Date: 2022-08-05
成都随锐云科技有限公司 +1
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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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[0056] like figure 1 As shown, a method for selecting a long reference frame based on rate-distortion optimization and frame loss prediction described in this embodiment includes the following steps:
[0057] Step 1: First consider the end-to-end sending and receiving method, that is, the sending end uses the preset multi-reference frame, and then judges the priority of the short reference and the long reference, and compares the solved probability of the reconstructed frame with the current encoding. The resultant function of the inter-distortion magnitudes is used to determine the target optimized rate-distortion function.
[0058] Step 2: Predict the probability that a transmitted reference frame with a step size of x from the current coded frame is lost, and multiply it by the frame loss probability to form the first term of the target optimization rate-distortion function.
[0059] Step 3: Calculate the distortion size between two frames after using a certain frame from ...
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The invention discloses a long reference frame selection method based on rate distortion optimization and frame loss prediction, and relates to the technical field of video coding and decoding. The method includes the following steps: Step 1: Determine the target optimized rate-distortion function by comparing the solved probability of the reconstructed frame and the resultant function of the distortion size between the reconstructed frame and the current encoding; The prediction of the probability of the sent reference frame being lost is multiplied by the frame loss probability to form the first item of the target optimization rate-distortion function; Step 3: Calculate the difference between the two frames after using a certain frame from the current coded frame as a reference. The size of the distortion between λ and λ is multiplied by the Lagrangian multiplier λ to form the second term of the target optimization rate-distortion function; Step 4: Obtain the optimal reference frame by finding the step value that minimizes the target optimization rate-distortion function. The present invention can reduce the distortion that may be caused by the loss of the selected reference frame, while taking into account the coding efficiency, thereby improving the user experience.
Description
technical field [0001] The present invention relates to the technical field of video coding and decoding, in particular to a method for selecting long reference frames based on rate-distortion optimization and frame loss prediction. Background technique [0002] Video communication is a common communication method in modern communication, and it appears in all aspects of our lives, such as webcasting, video news, video conferences, etc. The characteristics of video information are intuitive and large amount of information. For real-time video systems such as live broadcasts or video conferences, 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 types of frames in this type of video, I and P, and B frames are not used. Existing widely used encoding and decoding technologies, such as H264 or HEVC, usually select the previous frame as a reference frame to ...
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IPC IPC(8): H04N19/147H04N19/58H04N19/19H04N19/105
CPCH04N19/105H04N19/147H04N19/19H04N19/58
Inventor 陈明宇冯文澜
Owner 成都随锐云科技有限公司