Quick size reduction transcoding method based on region of interest

A region of interest, fast technology, applied in television, electrical components, digital video signal modification, etc., can solve problems such as inconsistent motion of macroblocks and inaccurate motion prediction

Inactive Publication Date: 2012-06-20
BEIJING UNIV OF TECH
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to make full use of the coding information in the input coding code stream, solve the problem of inaccurate motion prediction caused by inconsistent motion of macroblocks, and propose a region-of-interest-based video with higher transcoding for different motion degrees Quality fast downsizing transcoding method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Quick size reduction transcoding method based on region of interest
  • Quick size reduction transcoding method based on region of interest
  • Quick size reduction transcoding method based on region of interest

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] The present invention provides a fast size-reducing transcoding method based on the region of interest, and the detailed steps of the specific embodiment are as follows:

[0048] The test model JM12.2 of H.264 / AVC is adopted, and the experimental platform adopts Visual C++6.0. First, the CIF format video, that is, 352 pixels × 288 pixels, is downsized to QCIF format, that is, 176 pixels × 144 pixels; secondly, the CIF format video is encoded and decoded on JM12.2, and the encoding information is read during the decoding process. It is written in an external file in TXT format, and the encoding information is obtained by reading the external file when encoding the video after the downsizing; then the method mentioned in the present invention is called to complete the specific encoding work for the downsizing video. The first 50 frames of each sequence are selected for transcoding, and the coding method adopts intra-frame coding for the first frame, and inter-frame coding...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a quick size reduction transcoding method based on a region of interest, and belongs to the technical field of digital video transcoding of computers. The quick size reduction transcoding method comprises the following steps of: (1) acquiring encoded information from an input H.264 encoded code stream, wherein the encoded information comprises an inter-frame encoding mode, a motion vector and a discrete cosine conversion coefficient; and performing size reduction on a video of a pixel from a common intermediate format (CIF) into a quarter common intermediate format (QCIF), namely 176 pixels *144 pixels; (2) dividing a motion region and a background region by use of motion edge detection according to an image texture characteristic; and (3) adopting corresponding inter-frame modes for macroblocks positioned in different regions according to the motion characteristics of the marcoblocks, performing motion vector reconstruction on the macroblocks positioned in the motion region according to motion differences of the macroblocks by respectively selecting an adaptive motion vector down-sampling method or a most severe weighing method, performing the motion vector reconstruction on the macroblocks positioned in the background region by adopting an average weighing method, and performing motion search on the macroblocks positioned on the edge of and in a motion target. By utilizing the quick size reduction transcoding method, the quality of a transcoded video can be guaranteed, and the instantaneity of size reduction transcoding is realized.

Description

technical field [0001] The invention belongs to the technical field of computer digital video transcoding, and in particular relates to a method for downsizing and transcoding a video of the H.264 encoding standard based on an area of ​​interest. Background technique [0002] With the development of video coding technology and network technology, network-based multimedia communication, such as video conferencing, Internet video-on-demand, digital TV, etc., have been widely used in society and people's daily life. The service of clear digital video is favored by people. Due to the diversity of network types, such as Internet networks, telecommunication networks, and cellular wireless networks, the performance of terminal equipment, such as differences in display resolution, processing power, and storage capacity, and video coding standards, such as MPEG2, MPEG4, H.264, etc. The difference makes it very important to improve the compatibility of video streams in different appl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/167H04N19/57
Inventor 贾克斌吕卓逸刘鹏宇
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap