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Video synchronization method based on projection unchangeable descriptor

A technology of constant projection and video synchronization, which is applied in the direction of instruments, character and pattern recognition, computer components, etc., and can solve the problems of video synchronization, narrow application range, and inability to apply to many different scenarios.

Active Publication Date: 2017-11-03
XIDIAN UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and propose a video synchronization method based on projection invariant descriptors, which is used to solve the narrow application range caused by the inability of the prior art to apply video synchronization of various scenarios technical issues

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  • Video synchronization method based on projection unchangeable descriptor
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  • Video synchronization method based on projection unchangeable descriptor

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] refer to figure 1 , a video synchronization method based on projection invariant descriptors, comprising the following steps:

[0041] Step 1), obtain the reference video and the video to be synchronized of the same dynamic scene:

[0042] Use two uncalibrated cameras to shoot the same dynamic scene with multiple moving objects from different viewpoints, and get two videos V 1 and V 2 , and place the video V 1 As a reference video, video V 2 as the video to be synchronized;

[0043] Step 2), moving target trajectory extraction and background image matching:

[0044] For reference video V 1 and the video to be synchronized V 2 Feature extraction is performed separately to obtain the reference video V 1 The background image of I 1 and moving target trajectory point set T 1 ={p 1i |i=1,2,3...n 1}, and the video to be synchroniz...

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Abstract

The invention provides a video synchronization method based on a projection unchangeable descriptor. The objective of the invention is to solve a technical problem of the quite narrow applicable range caused by the fact that the existing method fails to be applicable to video synchronization of different scenes. The method comprises steps of carrying out moving target track extraction and background image matching on an input video; estimating epipolar geometries between background images; based on the cross ratio of five coplane points, constructing a projection unchangeable descriptor for each track point; by use of the principle that the nearest-neighbor next nearest neighbor is smaller than a designated threshold value, establishing initial track point matching pairs; by combining the track points, the matching and the epipolar geometries, restraining track point matching pairs without errors; by use of the repeated sampling for many times, constructing scoring matrixes and a thresholding method, and acquiring final frame matching pairs; and finally, using the random sampling consistency algorithm, calculating time model parameters between input videos. According to the invention, the method is suitable for video synchronization of multiple complex scenes; and quite average time synchronization errors and quite high correct matching rate can be acquired.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to a video synchronization method, in particular to a video synchronization method based on projection invariant descriptors, which can be applied to target recognition and tracking, video splicing, high-resolution video synthesis and three-dimensional reconstruction, etc. field. Background technique [0002] Video synchronization is a technology for time-calibrating multiple videos of the same dynamic scene recorded by multiple cameras that are not calibrated and placed at different viewing angles. The core goal of video synchronization is to establish the consistency of video frames from the same physical moment in multiple videos. Correspondence. Video synchronization can be broadly classified into two categories: direct methods and feature-based methods. The direct method usually takes an entire video frame as input, and performs comprehensive calculation and processing...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V20/48G06V20/46
Inventor 张强邵蓓关永强焦强李亚军
Owner XIDIAN UNIV
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