Code rate control method in video coding

A technology of video coding and medium bit rate, which is applied in the field of bit rate control in video coding, which can solve the problems of inaccurate bit rate control and achieve high precision, accurate prediction processing, and good image quality

Active Publication Date: 2018-05-08
SICHUAN JIUZHOU ELECTRIC GROUP
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  • Abstract
  • Description
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Problems solved by technology

[0006] The present invention provides a bit rate control method in video coding, which solves the technical problem of inaccurate bit rate control in the existing bit rate control method, and

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  • Code rate control method in video coding
  • Code rate control method in video coding
  • Code rate control method in video coding

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Embodiment Construction

[0040] The present invention provides a bit rate control method in video coding, which solves the technical problem of inaccurate bit rate control existing in the existing bit rate control method, and realizes that the current processing unit can be well predicted in terms of time and Spatial motion, so as to accurately predict the technical effect of processing video coding quantization parameters.

[0041] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, under the condition of not conflicting with each other, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0042] In the following description, many specific details are set forth in order to fully understand the present invention. However,...

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Abstract

The invention discloses a code rate control method in video coding. The method comprises the following steps: dividing an input video signal into serial video frame images; updating the number of remaining encoding bits of the current encoding frame; calculating an MAD value of a current basic unit according to a time domain linear prediction model; if MADcb is greater than TH, performing airspacecorrection; if MADcb is less than TH, not performing the airspace correction; calculating the number of coding bits used by a current macro block; calculating and correcting a quantization parameterQP value of the current macro block; executing rate distortion optimization to obtain an actual MAD value of the current macro block; performing circular execution until the macro blocks in the current basic unit are completely processed; and calculating the next basic unit, and performing circular execution until the basic units in the video frames are completely processed. The movement conditions of the current processing unit on time and space can be well predicted to accurately predict and process the video coding quantization parameter.

Description

technical field [0001] The invention relates to the field of railway catenary detection, in particular to a method for bit rate control in video coding. Background technique [0002] In multimedia communications, compressed video streams need to be transmitted over networks with inconsistent and varying bandwidth requirements. Generally speaking, the encoding bit rate is determined by factors such as the characteristics of the input video, the quality of the reconstructed video image, and the frame rate. When the quality and frame rate of the reconstructed video image are the same, for noisy, detailed, and complex motion video sequences, the encoding bit rate is higher. For "clean", smooth, and simple motion video sequences, The encoding bit rate is lower: for the same input video, the higher the quality and frame rate of the reconstructed video image, the higher the encoding bit rate. Therefore, the goal of video coding is to obtain the best possible image quality with th...

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Application Information

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IPC IPC(8): H04N19/107H04N19/142H04N19/147H04N19/176
CPCH04N19/107H04N19/142H04N19/147H04N19/176
Inventor 李汶隆邱吉刚吴新勇刘念林李东旭
Owner SICHUAN JIUZHOU ELECTRIC GROUP
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