CN100518241C - Method for obtaining two or more video synchronization frame - Google Patents

Method for obtaining two or more video synchronization frame Download PDF

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Publication number
CN100518241C
CN100518241C CNB2007100517910A CN200710051791A CN100518241C CN 100518241 C CN100518241 C CN 100518241C CN B2007100517910 A CNB2007100517910 A CN B2007100517910A CN 200710051791 A CN200710051791 A CN 200710051791A CN 100518241 C CN100518241 C CN 100518241C
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video
time scale
collection card
clock signal
scale image
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CN101035194A (en
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谢文娟
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Leador Spatial Information Technology Co., Ltd.
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Wuhan Lide Space Information Technology Development Co Ltd
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Abstract

The invention relates to a method for obtaining two or more synchronous frames of videos, comprising the steps of: (1) converting the same clock signal into time scale signal and sending the time scale signal to video collection card with OSD function; (2) the video collection card converts the time scale signal into time scale image and superposing the time scale image on each image frame of two or more videos; (3) compressing and storing the videos already superposed with the time scale image, respectively; and (4) by the superposed time scale image, searching the synchronous frame in each video. And the method can assure the synchronous frame of each video is strictly synchronous.

Description

A kind of method that obtains two or more video synchronization frames
Technical field
The present invention relates to mapping, Photogrammetry and Remote Sensing technical field, be specifically related to photogrammetric survey method, particularly photogrammetric in, obtain the method for two or more video synchronization frames.
Background technology
Close-shot photography measure technique generally adopts the CCD digital camera to take, and carries out Photogrammetric Processing according to stereogram and camera shooting attitude constantly.Yet it is higher to take used CCD camera price general charged, if adopt ccd video camera to take, its cost can be reduced to originally 1/20, and can move and take measurement continuously, and its filming frequency height, can intactly collect all atural objects on the way.
If adopt video image to carry out traverse measurement, the stereogram (synchronization frame that comes from two video cameras) that must between video, form synchronization, and obtain each stereogram and take video camera attitude constantly, it is the key that influences the video measuring precision, even the error of a frame, also can cause the video camera attitude mistake that obtains, precision is caused bigger influence.Therefore, this foundation to index has proposed very high requirement.
If adopt video image to carry out traverse measurement, generally can only adopt recording of video time started method to obtain two or more video synchronization frames, its concrete grammar is:
1, allow two or more video cameras opening entry videos simultaneously, the frame number that above-mentioned each video camera per second is taken is identical;
2, the image of each video camera shooting compresses the back storage respectively by video frequency collection card respectively;
3, the mode of getting identical shift time is sought the synchronization frame in each video of synchronization.
Because have the influence of video compression frame losing, said method is difficult to set up index accurately, can't guarantee that the synchronization frame that obtains in two or more videos is synchronous.Therefore, existing photogrammetric be adopt to adopt the CCD digital camera to take, and can not adopt ccd video camera to take.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method that obtains two or more video synchronization frames is provided, and this method can guarantee the synchronization frame strict synchronism of each video.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of method that obtains two or more video synchronization frames, it comprises:
(1) step that same clock signal is converted to the time scale signal and sends to the video frequency collection card that has at the screen Presentation Function;
(2) video frequency collection card is on every two field picture of time scale image and two or more videos that are added to above-mentioned time scale conversion of signals;
(3) will superpose the video step by video frequency collection card compression back storage respectively of time scale image;
(4) seek synchronization frame in each video by the time scale image of stack.
In the such scheme, two or more videos are the video of two or more video camera synchronization records; Each video camera is to have the outer video camera of exposure function synchronously; It is identical that each video camera per second is taken frame number.
In the such scheme, step (1) is specially: clock signal is converted to the time scale letter signal, the time scale letter signal is regularly sent to video frequency collection card again.
In the such scheme, described clock signal is the gps clock signal.
In the such scheme, step (4) is specially:
Each two field picture of the frame number that extracting (4-1), respectively is separated by in each video sets, time scale image region in the two field picture is respectively extracted in intercepting;
(4-2), identification character, and extract the step that two field picture is set up index to each respectively according to character;
(4-3), seek synchronization frame in each video according to the text index of each video.
Compared with prior art, the present invention has the following advantages:
1, the inventive method is added the time scale image in every frame video pictures of each video, again each video is carried out video compression respectively, effectively avoided the influence of video compression frame losing to audio video synchronization, realized the synchronous of stereogram and its shooting attitude data, realized from the video camera data artificial on this basis or computer extracts synchronous stereogram, and utilize and obtain its position and attitude lock in time, be the accurate photogrammetric condition of having created based on video camera.
2, video camera is to have the outer video camera of exposure function synchronously, and it is identical that each video camera per second is taken frame number, can guarantee that the time scale image that superposes on each synchronization frame is identical, can guarantee to obtain the synchronization frame strict synchronism in two or more videos.
3, clock signal is converted to the time scale letter signal, is convenient to the identification of computer, for correct judgement synchronization frame has been created condition to image.
4, introduce gps time signal, precision height.
5, the step of seeking the synchronization frame in each video by the time scale image of stack can be finished the efficient height automatically by computer.
Description of drawings
Fig. 1 is the flow chart of the inventive method embodiment
Fig. 2 is the employed hardware system block diagram of the inventive method embodiment
Fig. 3 is be added to software flow pattern on the every two field picture of each video of time scale
Fig. 4 is for giving each two field picture assignment by the time scale image of stack and setting up the software flow pattern of text index
Embodiment
As shown in Figure 2, the employed hardware of the inventive method embodiment comprises: computer, have at video frequency collection card, the GPS receiver of screen Presentation Function, the video camera of two or more same models.Video camera is quick logical 63V54, and it has outer exposure function synchronously.
The output of GPS receiver is connected with computer.Be connected with line synchro between each video camera.Video frequency collection card is the video frequency collection card of TKLS7200Q, and it is connected with computer by pci interface.Each video camera is connected with one or more capture cards by video interface.
The inventive method embodiment as shown in Figure 1, it comprises:
(1) step that same clock signal is converted to the time scale signal and sends to the video frequency collection card that has at the screen Presentation Function;
Above-mentioned two or more videos are the video of two or more video camera synchronization records; It is identical that each video camera per second is taken frame number.Controlling each video camera with line synchro during shooting exposes synchronously.
Above-mentioned clock signal is the gps clock signal, and it has the nanosecond time precision.
This step is specially: clock signal is converted to the time scale letter signal, the time scale letter signal is regularly sent to video frequency collection card with 40-50Hz again.Its software flow as shown in Figure 3.
Extract precision and speed in order to improve computer character, clock signal is converted to the time scale letter signal by software, and the time scale literal has adopted 5 bigger characters of visual difference to represent time scale.These 5 characters are respectively " 0 ", " 1 ", "-", " L ", " A ".Form 13 time scale literal by these 5 numerals.
(2) video frequency collection card is on every two field picture of time scale image and two or more videos that are added to above-mentioned time scale conversion of signals;
This step can be by setting up on the driver of video frequency collection card.
(3) will superpose the video step by video frequency collection card compression back storage respectively of time scale image;
(4) seek synchronization frame in each video of synchronization by the time scale image of stack, this step is specially:
Each two field picture of 480 frames (20 seconds) that extracting (4-1), respectively is separated by in each video sets, time scale image region in the two field picture is respectively extracted in intercepting;
(4-2), identification character, and according to character respectively to each step of extracting two field picture assignment and setting up text index; Its software flow as shown in Figure 4.
(4-3), seek synchronization frame in each video according to the text index of each video.

Claims (5)

1, a kind of method that obtains two or more video synchronization frames, it is characterized in that: it comprises:
(1) step that same clock signal is converted to the time scale signal and sends to the video frequency collection card that has at the screen Presentation Function;
(2) video frequency collection card is on every two field picture of time scale image and two or more videos that are added to above-mentioned time scale conversion of signals;
(3) will superpose the video step by video frequency collection card compression back storage respectively of time scale image;
(4) seek synchronization frame in each video by the time scale image of stack.
2, the method for claim 1 is characterized in that: above-mentioned two or more videos are the video of two or more video camera synchronization records; Each video camera is to have the outer video camera of exposure function synchronously; It is identical that each video camera per second is taken frame number.
3, the method for claim 1 is characterized in that: step (1) is specially: clock signal is converted to the time scale letter signal, the time scale letter signal is regularly sent to video frequency collection card again.
4, as claim 1 or 3 described methods, it is characterized in that: described clock signal is the gps clock signal.
5, method as claimed in claim 3 is characterized in that: step (4) is specially:
Each two field picture of the frame number that extracting (4-1), respectively is separated by in each video sets, time scale image region in the two field picture is respectively extracted in intercepting;
(4-2), identification character, and extract the step that two field picture is set up index to each respectively according to character;
(4-3), seek synchronization frame in each video according to the text index of each video.
CNB2007100517910A 2007-04-04 2007-04-04 Method for obtaining two or more video synchronization frame Active CN100518241C (en)

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CN100518241C true CN100518241C (en) 2009-07-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8104055B2 (en) * 2007-11-14 2012-01-24 Mavs Lab. Inc. Method of identifying target synchronization point pair through scan-line image matching scheme
CN102957966B (en) * 2011-08-19 2016-03-16 深圳市快播科技有限公司 A kind of method of player and the frame of video embedded time for player
CN104754271B (en) * 2015-04-23 2017-07-04 国家体育总局体育科学研究所 A kind of ANTENNAUDIO synchronization system and method
CN106027886B (en) * 2016-05-17 2019-08-06 深圳市极酷威视科技有限公司 A kind of panoramic video realizes the method and system of synchronization frame
CN109302567A (en) * 2017-07-25 2019-02-01 珠海全志科技股份有限公司 Camera image low latency synchronization system and image low latency synchronous method
CN108055423B (en) * 2017-12-22 2020-06-09 成都华栖云科技有限公司 Multi-lens video synchronization offset calculation method

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