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Video transcoding fast intra-frame predicating method based on support vector machine

A support vector machine and video transcoding technology, applied in the field of digital video transcoding, can solve the problems of improving transcoding efficiency, not making full use of coding information, and failing to achieve video transcoding effects, achieving low complexity and avoiding exhaustion. full search effect

Inactive Publication Date: 2012-05-16
BEIJING UNIV OF TECH
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Problems solved by technology

However, these intra-frame optimization algorithms do not make full use of the input coding information to improve transcoding efficiency, and cannot achieve ideal results in video transcoding

Method used

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  • Video transcoding fast intra-frame predicating method based on support vector machine
  • Video transcoding fast intra-frame predicating method based on support vector machine
  • Video transcoding fast intra-frame predicating method based on support vector machine

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Embodiment Construction

[0044] The present invention provides a fast intra-frame prediction method for video transcoding based on a support vector machine, and the detailed steps of its specific embodiment are as follows:

[0045] The test model JM12.2 of H.264 / AVC is adopted, and the experimental platform adopts Visual C++6.0. Firstly, the standard test sequence in CIF format (352×288) is reduced to QCIF format (176×144); secondly, the CIF format video is encoded and decoded on JM12.2, and the encoding information is read and written in the decoding process In the external file of TXT format, obtain coding information by reading the external file when the video after reducing the size is encoded; Then call the method mentioned in the present invention to complete the specific coding work to the reduced-size video. The first 50 frames of each sequence are selected for transcoding, and the coding method is all intra-frame coding (I frame).

[0046] In the specific implementation, the following proced...

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Abstract

The invention relates to a video transcoding fast intra-frame predicating method based on a support vector machine (SVM), belonging to the technical field of digital video transcoding. The method specifically comprises the following steps of: (1) decoding an input high-resolution video code stream to extract a coded message, constituting multidimensional feature vectors to train a support vector machine model, and establishing a correlation between a high-resolution video coded message and an intra-frame encoding mode of a macroblock in a down-sizing video; (2) constructing a layered SVM classifier to classify the intra-frame predicating modes of the macroblock in the down-sizing video, thereby reducing the number of the predicating modes; (3) encoding the down-sizing video through the reduced intra-frame modes to realize the early termination of a rate-distortion optimization algorithm in the process of transcoding and recoding so as to achieve the purpose of reducing the complexity of the transcoding operation and realize a H.264 video code converter with low complexity; and (4) outputting a low-resolution video code stream subjected to transcoding. The method can not only ensure the quality of the video after transcoding, but also effectively solve the problem on transcoding real-time property of the down-sized video.

Description

technical field [0001] The invention belongs to the technical field of digital video transcoding, and in particular relates to a fast intra-frame prediction method for video transcoding based on a support vector machine. Background technique [0002] In recent years, with the rapid development of network technology, multimedia communication has been widely integrated into social and personal life. Due to the diversity of network types (such as Internet network, telecommunication network and cellular wireless network, etc.), the performance of terminal equipment (such as display resolution, processing power and storage capacity, etc.) Compatibility becomes very important. Video transcoding to convert spatial resolution provides an effective solution for supporting various video display devices. It converts the original resolution video stream into a target resolution stream suitable for display at the receiving end. H.264 is superior to other video coding standards in terms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/105H04N19/40
Inventor 贾克斌吕卓逸孙中华
Owner BEIJING UNIV OF TECH
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