Video service system, video service device and extraction method for key frame thereof

A video key frame and extraction method technology, which is applied to TV system parts, digital video signal modification, TV, etc., can solve the problems of large amount of calculation, no consideration of directionality, and inability to extract key frames, etc., so as to reduce errors Rate and complexity, the effect of reducing the amount of calculation

Inactive Publication Date: 2009-11-18
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: first, prior art one needs to extract the contour information of all moving objects, and perform operations on the contour information, because the algorithmic process of extracting the contour information It is very complicated, thus causing a large amount of calculation in the prior art; secondly, the prior art one is to extract key frames that change from static to motion or from motion to static, but cannot extract
[0007] However, in the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: first, th

Method used

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  • Video service system, video service device and extraction method for key frame thereof
  • Video service system, video service device and extraction method for key frame thereof
  • Video service system, video service device and extraction method for key frame thereof

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Embodiment Construction

[0019] figure 1 Shown is a system diagram of a video service system 10 according to Embodiment 1 of the present invention. In this embodiment, the video service system 10 includes a video service device 20 and a user terminal device 30, and the video service device 20 and the user terminal device 30 are connected through a network (not shown) for communication or the video service device 20 and the user terminal device 30 are connected simultaneously. placed in the same video terminal device. In this embodiment, the video service device 20 is used to extract key frames by judging whether the direction and magnitude of the motion vectors corresponding to the feature vector sets of two adjacent frames in the video stream change, and extract the key frames The frames are divided into classes and provided to the user terminal device 30 . In this embodiment, the video service device 20 may be a video retrieval service device or a video transmission service device or a video encod...

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Abstract

The invention discloses an extraction method for a key frame, applied to extraction of the key frame of a video data flow in a video service system. The extraction method is characterized by comprising the following steps: obtaining a motion vector of each frame in the video data stream, and obtaining a feature vector set of the motion vector of each frame; extracting the key frame by determining whether directions and amplitudes of the motion vectors corresponding to the feature vector sets of two adjacent front and back frames are changed. The invention also provides a video service device and the video service system. The invention can efficiently extract a frame with suddenly changed speed, lower the error rate and the complexity for extracting the key frame, and reduce the calculation amount.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technologies, and in particular, to a video service system, a video service device and a method for extracting key frames thereof. Background technique [0002] When people observe the objective world, they are often most interested in abnormal events and obtain a lot of information from abnormal changes. For an object, an abnormal state means that the motion state of the object has changed significantly, such as from static to motion, from motion to static, the direction of motion changes, or the speed of motion changes significantly. Similarly, when people watch a video scene, they pay attention to the change of the scene, and the change of the video scene is the reflection of the significant change in the motion state of the object in the scene. The scene change also includes the switching of the scene. It can be considered that the switching of the scene is that the object i...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06T7/20H04N7/26
CPCH04N5/147H04N19/00266H04N19/0003H04N19/00151H04N7/26031H04N7/26271H04N7/26138H04N19/107H04N19/139H04N19/172
Inventor 邸佩云胡昌启元辉马彦卓常义林
Owner HUAWEI TECH CO LTD
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