Rate Control Method for Intra-Frame Coding

A bit rate control and intra-frame coding technology, which is applied in the field of image and video coding systems based on block coding technology, can solve the problems of low bit rate control accuracy and unsuitable video sequence bit rate control, etc.

Inactive Publication Date: 2017-05-03
TONGJI UNIV
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Problems solved by technology

However, for the latest video coding standard HEVC, the current research on rate control of intra-frame predictive coding frames mainly focuses on frame-level control, that is, the same quantization step is used for the same frame, and the accuracy of bit rate control is not high. At the same time, for intra-frame predictive coding The bit rate model parameters of the frame are usually predicted by the encoded frame, which is not suitable for bit rate control of the initial frame in the video sequence and the initial frame of the scene

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Embodiment 1

[0071] The method of the present invention can be used for bit rate control of image coding or intra-frame prediction coding in video coding. The following uses HEVC as an example.

[0072] The basic steps of the rate control method of the present invention are as follows Figure 5 Shown:

[0073] Step 1: Start encoding of the current video frame or image;

[0074] Step 2: Read a frame of image of the video stream;

[0075] Step 3: Divide the current video frame into blocks. In HEVC coding, a CTU is used to form a block group;

[0076] Step 4: Calculate the complexity of all CTUs in the video frame to obtain SG F And all SG m . SG F By setting M and N in formula 1 to the number of horizontal pixels and the number of vertical pixels of the current video frame, respectively, it is calculated by formula 1;

[0077] Step 5: Assign the coded target data volume to the currently coded CTU, in units of bits. Suppose the current coding CTU is the m-th block group, and its target data volume R...

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Abstract

The invention discloses a precise rate control method for intra-frame coding and relates to the technical field of digital image and video coding. The rate control method for intra-frame coding comprises the steps of: dividing a frame of images into block groups; describing complexity of the block groups by utilizing a sum of absolute values of gradients among adjacent pixel points in the block groups, and determining a quantization step of each block group by using an index model for a ratio of a coding data amount to the complexity. Therefore, rate control at the block group level is realized, and the purpose of precise control on the rate is realized.

Description

Technical field [0001] The present invention relates to the technical field of digital image and video coding, in particular to an image and video coding system based on block coding technology. Background technique [0002] Today, with the rapid development of science and technology, people obtain information through electronic equipment and the Internet to strengthen communication with each other, and there is an increasing need to store and transmit images and videos. The amount of digital image and digital video data is huge. It is necessary to use appropriate coding technology to compress images and videos during storage and transmission to achieve the purpose of reducing storage space and reducing transmission bandwidth requirements. Among the commonly used digital image and video coding technologies, block-based hybrid coding technology is the mainstream technology, such as the widely used image coding standards JPEG and video coding standards: MPEG-1, MPEG-2 / H.262, MPEG ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/593H04N19/146H04N19/174H04N19/124
Inventor 岑峰陆千里许维胜
Owner TONGJI UNIV
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