Improved H.264 compressed encoding method for video file under limited bandwidth and emission rate condition

A technology of transmission rate and compression coding, which is applied in the field of H.264 compression coding and can solve problems such as limited network resources

Active Publication Date: 2014-11-05
HARBIN INST OF TECH
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Problems solved by technology

[0016] The present invention aims to solve the problem that the existing wireless mobile communication network video download transmission method adapts to the limited network resources, and in order to meet the needs of high-speed, high-quality transmission, thereby providing a method for video downloading under the condition of limited bandwidth and transmission rate. Improved H.264 Compression Coding Method for Video Files

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  • Improved H.264 compressed encoding method for video file under limited bandwidth and emission rate condition
  • Improved H.264 compressed encoding method for video file under limited bandwidth and emission rate condition
  • Improved H.264 compressed encoding method for video file under limited bandwidth and emission rate condition

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specific Embodiment approach 1

[0045] The specific embodiment one, is used for the improved H.264 compression coding method of video file under limited bandwidth and transmission rate condition, and it is realized by the following steps:

[0046] Step 1, initialization: whether the current frame is the starting frame, if it is the first frame of the video stream or the first frame of the coded stream, execute step 11, if not, execute step 12;

[0047] Step 11, carry out complex wavelet transformation to image, obtain horizontal, vertical and 45 ° angle direction information, execute step 4;

[0048] Step one and two, carry out complex wavelet transformation to image, obtain horizontal, vertical and 45 ° angle direction information, carry out step two;

[0049] Step 2. Prediction behavior selection: According to the directional feature correlation between the current frame and the reference frame, determine the prediction method used. If inter-frame prediction is selected, perform step 3. If intra-frame pred...

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Abstract

The invention discloses an improved H.264 compressed encoding method for a video file under the limited bandwidth and transmission rate condition, and relates to the field of digital image processing. The improved H.264 compressed encoding method aims at solving the problem that adaptive network resources of a video downloading transmission method in an existing wireless mobile communication network are limited, and the high-speed and high-definition transmission requirement is met. The improved H.264 compressed encoding method includes the steps that in the initial phase, each frame of image is compressed in advance, characteristics of the images in different directions are extracted through plural wavelet transformation, and meanwhile information redundancies are reduced; in the inter-frame prediction phase, according to the directive characteristics obtained through the wavelet transformation, the spatial correlation between inter-frame images is judged, the complexity and the dimensionality of motion vector calculation are reduced, and a P frame and a B frame are obtained; in the intra-frame prediction phase, detail characteristics are eliminated, prediction and integer cosine transformation are only carried out on the overall characteristics, and an I frame is obtained. The improved H.264 compressed encoding method is suitable for improved H.264 compressed encoding on the video file under the limited bandwidth and transmission rate condition.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to H.264 compression coding technology. Background technique [0002] The purpose of video coding is to achieve video compression. According to Shannon's information theory, information entropy is used to represent the information of data, and the rest of the information is redundant. A large amount of fragmented redundancy still exists in video information. Therefore, removing redundancy has also become the core content of video coding technology in order to achieve the purpose of compression. Video coding technology mainly targets the following types of redundancy: [0003] (1) Time redundancy between frames. Human vision has a short-lived effect, and the flashing scene will not disappear immediately, so if the flashing frequency of the picture is higher than the value of human beings, the human eye will not feel the pause between frames. Generally, the video will use Fr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/103H04N19/105H04N19/63H04N19/13
Inventor 李卓明王鹏高峰沙学军赵洪林李德志高玉龙
Owner HARBIN INST OF TECH
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