Fixed code rate control algorithm with low time delay and low complexity

A low-complexity, fixed-bit-rate technology, applied in the field of video transmission, can solve problems such as buffer memory overflow, and achieve the effect of improving video quality

Active Publication Date: 2020-12-04
西安迪威码半导体有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a low-delay and low-complexity fixed code rate control algorithm, which ensures a fixed time delay and c

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  • Fixed code rate control algorithm with low time delay and low complexity
  • Fixed code rate control algorithm with low time delay and low complexity
  • Fixed code rate control algorithm with low time delay and low complexity

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[0074] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features or characteristics may be combined in any suitable manner in one or more embodiments.

[0075] like figure 1 As shown, the present invention comprises the following steps:

[0076] Step 1: Divide slices according to latency and resolution.

[0077] Step 2: Divide the coding unit CTU according to the slice.

[0078] Step 3: Sobel operator detects image complexity.

[0079] Step 4: Determine the quantization parameter of the current coding block.

[0080] Step 5: Perform the first encoding.

[0081] Step 6: Calculate the target stream o...

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Abstract

The invention provides a fixed code rate control algorithm with low time delay and low complexity. The algorithm includes steps of: dividing the Slices according to a time delay requirement and a target code stream and dividing a coding unit CTU according to the Slice; detecting, by the Sobel operator, the complexity of the image; determining a quantization parameter of the current processing block; executing the first encoding; adjusting an initial quantization parameter of the Slice according to the actual code stream and the target code stream used in the first encoding; calculating a target code stream of each block according to the first encoding result; executing second encoding and performing code rate control in real time; and performing pixel adaptive compensation coding independent of the video code stream, and intergrating the code streams to obtain the fixed code stream. According to the algorithm, on the premise of ensuring high video quality, quantitative adjustment can be performed on video coding through a low-complexity code rate control algorithm with fixed coding time delay, so that a fixed transmission code stream is obtained.

Description

technical field [0001] The invention belongs to the technical field of video transmission, and in particular relates to a low-delay and low-complexity fixed code rate control algorithm. Background technique [0002] In recent years, with the development of applications such as drones, FPV, VR, and film and television shooting, the accompanying video image transmission and processing technologies have also developed rapidly. Especially in recent years, more and more video codec standards have played an indispensable role in the improvement of video quality. Among them, rate control is one of the very important technologies in video coding. Although it is not a video coding standard, if any standard does not have a suitable rate control method, the client buffer may overflow or underflow. Secondly, the current video transmission system has higher and higher requirements for delay, especially with the development of video image codec and 5G technology, its video quality and st...

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Application Information

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IPC IPC(8): H04N19/625H04N19/122H04N19/124H04N19/184
CPCH04N19/625H04N19/124H04N19/122H04N19/184
Inventor 李焕青周彩章李根
Owner 西安迪威码半导体有限公司
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