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Image/video coding method of pattern vector pretreatment and multi-pattern library based on mean removal

A mode vector and video coding technology, applied in the field of image/video coding, can solve the problems that are not conducive to the image/video compression efficiency, do not take into account the structural characteristics of the image/video frame, etc., to achieve the effect of improving the utilization rate and meeting the dual needs

Inactive Publication Date: 2015-09-30
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

This division method does not take into account the structural characteristics of each image / video frame, and is not conducive to improving the compression efficiency of images / videos

Method used

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  • Image/video coding method of pattern vector pretreatment and multi-pattern library based on mean removal
  • Image/video coding method of pattern vector pretreatment and multi-pattern library based on mean removal

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Embodiment

[0034] For the video that needs to be encoded, the specific steps are as follows:

[0035] Step 1) Calculate the mean value of each vector in the training vector set {X(t),t=0,1,L,L-1}, and round the mean value, and then let each vector subtract the corresponding rounded mean, to get a new training vector set {X′(t),t=0,1,L,L-1}.

[0036] Step 2) Calculate the mean square error of each vector in the training vector set {X′(t), t=0, 1, L, L-1}, and arrange the training vectors in ascending order according to the size of the mean square error.

[0037] Step 3) Divide the reordered training vector set into two parts according to the pre-set threshold, and obtain two parts whose mean square error increases sequentially, that is, the low frequency part and the high frequency part: {X' 1 (t)}, {X' 2 (t)}, where t=0,1,L,L-1.

[0038] Step 4) at fixed intervals from {X' 1 (t)}, {X' 2 (t)} each select N / 2 training vectors, and combine them together to form an initialization patter...

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Abstract

The invention relates to an image / video coding method of pattern vector pretreatment and a multi-pattern library based on mean removal. Before a pattern library is initiated, a mean value is subtracted from each training vector, then the training vectors are sorted and classified according to the mean square error of the training vectors after mean removal, then pattern vectors are extracted from the training vectors, so as to form an initial pattern library, and a plurality of pattern libraries with the pattern vectors of different sizes are used when an image / video is coded. According to the image / video coding method, the utilization efficiency of the pattern vectors in the pattern library can be improved, a most appropriate pattern library can be selected to code according to structural features of the image, and additionally, double requirements on the quality and compression ratio of the image / video are satisfied.

Description

technical field [0001] The invention relates to the field of image / video encoding, in particular to an image / video encoding method based on mode vector preprocessing of mean removal and a multi-mode library. Background technique [0002] At present, video coding algorithms are mainly developed by the MPEG-x series standards formulated by the Moving Picture Experts Group (MPEG) and the H.26x series standards formulated by the International Telecommunication Union (ITU-T), and their joint development H.264 and HEVC. In addition, some researchers have developed a good video coding algorithm in another way. The image / video coding algorithm based on 3D SOM is one of them. [0003] Inspired by the organization principle of neurons in the human brain, Kohonen proposed an artificial neural network algorithm with self-organizing characteristics - self-organizing feature map (SOM) algorithm. The SOM network adopts a double-layer network structure, which is divided into an input lay...

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Application Information

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IPC IPC(8): H04N19/513H04N19/105
Inventor 黎洪松艾新宇
Owner GUILIN UNIV OF ELECTRONIC TECH
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