CN103442216A - Monitoring video time calibration device and calibration method thereof - Google Patents
Monitoring video time calibration device and calibration method thereof Download PDFInfo
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- CN103442216A CN103442216A CN2013103709960A CN201310370996A CN103442216A CN 103442216 A CN103442216 A CN 103442216A CN 2013103709960 A CN2013103709960 A CN 2013103709960A CN 201310370996 A CN201310370996 A CN 201310370996A CN 103442216 A CN103442216 A CN 103442216A
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Abstract
The invention discloses a monitoring video time calibration device and a calibration method of the monitoring video time calibration device. The monitoring video time calibration device is used for calibrating the video time of a monitoring video and comprises an object frame obtaining module, an object time obtaining module, an object time calibration module and a video time calibration module. A video frame In with the frame sequence of n is selected from the monitoring video at random to serve as an object frame, the object time t1 is obtained from an object frame image through analysis and automatic identification on the monitoring video, the actual time t2 of the object frame is calculated according to a known time deviation dt and the object time t1, the known time deviation dt is the time difference between the object time t1 and the ideal time, and t2=t1+dt. The frame rate f is obtained through analysis on the monitoring video, the actual time t3 corresponding to a video frame Im with the frame sequence of m is calculated at random, and therefore time calibration on the whole monitoring video is achieved. The invention further relates to the calibration method of the calibration device.
Description
Technical field
The present invention relates to a kind of time calibration device and the calibration steps thereof of field of video processing and public safety field, calibrating installation and the calibration steps thereof of a kind of monitor video time facilitated for the daily monitoring of public security officer and video investigation specifically.
Background technology
The video monitoring system of modern network, for public security officer's clear up a criminal case provides the multitude of video clue, has played great role for maintain social stability.Yet in actual applications, because there are deviation in the onboard clock of a large amount of monitoring cameras and standard Beijing time, time and actual time that the video that causes it to record is shown are not inconsistent, investigate to personnel in charge of the case's video and brought very large inconvenience.
Although the problems referred to above are ubiquity in public security officer's routine work, do not cause enough attention.Current solution is mainly manually the wrong time shown in video to be done to manual correction by the personnel in charge of the case, has so not only affected case handling efficiency, and the generation that easily leads to errors.
Summary of the invention
For overcoming above-mentioned defect, the present invention is necessary to provide a kind of can carry out to monitor video calibrating installation and the calibration steps thereof of the monitor video time of time calibration.
The present invention is achieved in that the calibrating installation of monitor video time, and it is for calibrating the video time of monitor video; It comprises target frame acquisition module, target time-obtaining module, target module time calibration, video time calibration module; Wherein,
This target frame acquisition module is for choosing at random at this monitor video the frame of video I that frame sequence is n
nas the target frame, wherein, n is positive integer;
This target time-obtaining module, for the parsing by this monitor video and identification automatically, is obtained target time t from this target frame picture
1;
This target module time calibration is used for according to known time deviation dt, target time t
1calculate t actual time of this target frame
2, known time deviation dt is target time t
1and the time difference between ideal time, t
2=t
1+ dt;
This video time calibration module is used for obtaining its frame per second f by the parsing to this monitor video, and calculates the frame of video I that any frame sequence is m
mcorresponding t actual time
3to realize the time calibration of whole section monitor video, wherein, m is positive integer: this frame of video I
nwith this frame of video I
mthe time interval be (m-n)/f, this frame of video I
mt actual time
3=t
2+ (m-n)/f.
As the further improvement of such scheme, target time t
1obtain employing: decoding target frame, manually read this time as target time t from the picture of target frame
1.
As the further improvement of such scheme, target time t
1obtain employing: decoding target frame, and by the digital recognition technology in graphical analysis, its picture disply time of automatic acquisition is as target time t
1.
As the further improvement of such scheme, this ideal time is Beijing time.
The present invention also provides the calibration steps of a kind of monitor video time, and it is for calibrating the video time of monitor video; It comprises the following steps:
Choose at random the frame of video I that frame sequence is n in this monitor video
nas the target frame, wherein, n is positive integer;
By the parsing to this monitor video and identification automatically, from this target frame picture, obtain target time t
1;
According to known time deviation dt, target time t
1calculate t actual time of this target frame
2, known time deviation dt is target time t
1and the time difference between ideal time, t
2=t
1+ dt;
Obtain its frame per second f by the parsing to this monitor video, and calculate the frame of video I that any frame sequence is m
mcorresponding t actual time
3to realize the time calibration of whole section monitor video, wherein, m is positive integer: this frame of video I
nwith this frame of video I
mthe time interval be (m-n)/f, this frame of video I
mt actual time
3=t
2+ (m-n)/f.
As the further improvement of such scheme, target time t
1obtain employing: decoding target frame, manually read this time as target time t from the picture of target frame
1.
As the further improvement of such scheme, target time t
1obtain employing: decoding target frame, and by the digital recognition technology in graphical analysis, its picture disply time of automatic acquisition is as target time t
1.
As the further improvement of such scheme, this ideal time is Beijing time.
The present invention has the following advantages: 1, the present invention is developed out ripe software, uses very directly perceived, convenient; 2, computational complexity is very low, meets the requirement of real-time; 3, time calibration, precision was high, and error is at Millisecond.
The accompanying drawing explanation
Choose at random the frame of video I that frame sequence is n in the monitor video that Fig. 1 is the life period deviation
nschematic diagram as the target frame.
The dialog box when calibrating installation that Fig. 2 is monitor video time of adopting better embodiment of the present invention to provide carries out time calibration.
The schematic diagram of calibrating installation after time calibration of the monitor video time that Fig. 3 provides through better embodiment of the present invention for target frame in Fig. 1.
Fig. 4 is the time calibration according to the target frame, the schematic diagram of any frame of the calibrating installation of the monitor video time that monitor video provides through better embodiment of the present invention after time calibration.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The calibrating installation of monitor video time of the present invention is for calibrating the video time of monitor video, and it comprises target frame acquisition module, target time-obtaining module, target module time calibration, video time calibration module.
This target frame acquisition module is for choosing at random at this monitor video the frame of video I that frame sequence is n
nas the target frame, wherein, n is positive integer.
This target time-obtaining module, for the parsing by this monitor video and identification automatically, is obtained target time t from this target frame picture
1.Target time t
1obtained two kinds of modes, one: decoding target frame, manually read this time as target time t from the picture of target frame
1; Two: decoding target frame, and by the digital recognition technology in graphical analysis, its picture disply time of automatic acquisition is as target time t
1.
This target module time calibration is used for according to known time deviation dt, target time t
1calculate t actual time of this target frame
2, known time deviation dt is target time t
1and the time difference between ideal time, t
2=t
1+ dt.Dt can obtain in several ways, usually by the camera supplier, is provided.If the supplier can't provide this parameter, also can obtain by field test.This ideal time can be Beijing time, also can be the time Anywhere that needs reference, as London time, Moscow Time etc.
This video time calibration module is used for obtaining its frame per second f by the parsing to this monitor video, and calculates the frame of video I that any frame sequence is m
mcorresponding t actual time
3to realize the time calibration of whole section monitor video, wherein, m is positive integer: this frame of video I
nwith this frame of video I
mthe time interval be (m-n)/f, this frame of video I
mt actual time
3=t
2+ (m-n)/f.
The invention still further relates to the calibration steps corresponding with the calibrating installation of this monitor video time, the calibrating installation of this monitor video time adopts software to realize its function.The calibration steps of monitor video time comprises the following steps:
Choose at random the frame of video I that frame sequence is n in this monitor video
nas the target frame, wherein, n is positive integer;
By the parsing to this monitor video and identification automatically, from this target frame picture, obtain target time t
1;
According to known time deviation dt, target time t
1calculate t actual time of this target frame
2, known time deviation dt is target time t
1and the time difference between ideal time, t
2=t
1+ dt;
Obtain its frame per second f by the parsing to this monitor video, and calculate the frame of video I that any frame sequence is m
mcorresponding t actual time
3to realize the time calibration of whole section monitor video, wherein, m is positive integer: this frame of video I
nwith this frame of video I
mthe time interval be (m-n)/f, this frame of video I
mt actual time
3=t
2+ (m-n)/f.
Application software demonstration of the present invention:
Refer to Fig. 1, demonstrated the first frame of one section monitor video.We choose the first frame as the target frame, and that its upper left corner rectangular boxes shows is target time t devious
1, be 13:26:54 on September 11st, 2011.The information provided by camera vendor, this camera is slower one hour (being that dt is one hour) than Beijing time.So we calculate the real target time is t
2=t
1+ dt, be 14:26:54 on September 11st, 2011.Then function button time calibration that we click in the lower square square frame of Fig. 1 carries out time calibration.
Click function button time calibration in Fig. 1, eject dialog box time calibration, as shown in Figure 2, by correct target time t
2, on September 11st, 1,14:26:54 input dialogue frame, and click to determine.
By above-mentioned steps, completed time calibration, Fig. 3 has shown the video target frame after the calibration, the orthochronous of this frame is presented at Fig. 3 below rectangular boxes.
Fig. 4 has shown other any frames of arbitrarily choosing in the monitor video, in the rectangular boxes of the upper left corner, is still the present frame time devious.It in the rectangular boxes of bottom, is the time after the present frame calibration.Can find that the time devious is still than slow one hour of the time after calibration.
The calibrating installation of monitor video time of the present invention and calibration steps thereof, because there are deviation in a lot of monitoring camera onboard clocks in real world applications and standard Beijing time, the time that causes captured a large amount of monitor videos to show is inaccurate, thereby handles a case and caused very large inconvenience to public security officer's video investigation.The present invention utilizes frame per second and known camera onboard clock and the deviation of Beijing time of time devious of showing in video, video, derive actual time of every frame video to realize standard Beijing time calibration of whole section video, for the video time across camera synchronously provides foundation.The present invention has the following advantages: 1, the present invention is developed out ripe software, uses very directly perceived, convenient; 2, computational complexity is very low, meets the requirement of real-time; 3, time calibration, precision was high, and error is at Millisecond.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the calibrating installation of monitor video time, it is for calibrating the video time of monitor video; It is characterized in that: it comprises target frame acquisition module, target time-obtaining module, target module time calibration, video time calibration module; Wherein,
This target frame acquisition module is for choosing at random at this monitor video the frame of video I that frame sequence is n
nas the target frame, wherein, n is positive integer;
This target time-obtaining module, for the parsing by this monitor video and identification automatically, is obtained target time t from this target frame picture
1;
This target module time calibration is used for according to known time deviation dt, target time t
1calculate t actual time of this target frame
2, known time deviation dt is target time t
1and the time difference between ideal time, t
2=t
1+ dt;
This video time calibration module is used for obtaining its frame per second f by the parsing to this monitor video, and calculates the frame of video I that any frame sequence is m
mcorresponding t actual time
3to realize the time calibration of whole section monitor video, wherein, m is positive integer: this frame of video I
nwith this frame of video I
mthe time interval be (m-n)/f, this frame of video I
mt actual time
3=t
2+ (m-n)/f.
2. the calibrating installation of monitor video time as claimed in claim 1, is characterized in that: target time t
1obtain employing: decoding target frame, manually read this time as target time t from the picture of target frame
1.
3. the calibrating installation of monitor video time as claimed in claim 1, is characterized in that: target time t
1obtain employing: decoding target frame, and by the digital recognition technology in graphical analysis, its picture disply time of automatic acquisition is as target time t
1.
4. the calibrating installation of monitor video time as claimed in claim 1, it is characterized in that: this ideal time is Beijing time.
5. the calibration steps of monitor video time, it is for calibrating the video time of monitor video; It is characterized in that: it comprises the following steps:
Choose at random the frame of video I that frame sequence is n in this monitor video
nas the target frame, wherein, n is positive integer;
By the parsing to this monitor video and identification automatically, from this target frame picture, obtain target time t
1;
According to known time deviation dt, target time t
1calculate t actual time of this target frame
2, known time deviation dt is target time t
1and the time difference between ideal time, t
2=t
1+ dt;
Obtain its frame per second f by the parsing to this monitor video, and calculate the frame of video I that any frame sequence is m
mcorresponding t actual time
3to realize the time calibration of whole section monitor video, wherein, m is positive integer: this frame of video I
nwith this frame of video I
mthe time interval be (m-n)/f, this frame of video I
mt actual time
3=t
2+ (m-n)/f.
6. the calibration steps of monitor video time as claimed in claim 5, is characterized in that: target time t
1obtain employing: decoding target frame, manually read this time as target time t from the picture of target frame
1.
7. the calibration steps of monitor video time as claimed in claim 5, is characterized in that: target time t
1obtain employing: decoding target frame, and by the digital recognition technology in graphical analysis, its picture disply time of automatic acquisition is as target time t
1.
8. the calibration steps of monitor video time as claimed in claim 5, it is characterized in that: this ideal time is Beijing time.
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CN105550689A (en) * | 2015-12-04 | 2016-05-04 | 联想(北京)有限公司 | Information processing method, first electronic equipment and second electronic equipment |
CN112149670A (en) * | 2020-09-25 | 2020-12-29 | 武汉大学 | Automatic timing method for social security video |
CN114697466A (en) * | 2022-03-17 | 2022-07-01 | 杭州海康威视数字技术股份有限公司 | Video frame acquisition synchronization control |
CN117915138A (en) * | 2024-01-08 | 2024-04-19 | 湖北泰跃卫星技术发展股份有限公司 | Video time calibration method in data center station |
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CN117915138A (en) * | 2024-01-08 | 2024-04-19 | 湖北泰跃卫星技术发展股份有限公司 | Video time calibration method in data center station |
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