CN107835397A - A kind of method of more camera lens audio video synchronizations - Google Patents
A kind of method of more camera lens audio video synchronizations Download PDFInfo
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- CN107835397A CN107835397A CN201711405193.9A CN201711405193A CN107835397A CN 107835397 A CN107835397 A CN 107835397A CN 201711405193 A CN201711405193 A CN 201711405193A CN 107835397 A CN107835397 A CN 107835397A
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- camera lens
- audio video
- milliseconds
- camera
- clock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Studio Devices (AREA)
Abstract
The present invention relates to a kind of method of more camera lens audio video synchronizations, this programme can be encoded by designing one group with the clock of self-clocking, when carrying out pan-shot, staff or mobile device is allowed to control clock coding to be enclosed around whole camera lenses one, so that all camera lenses all record current clock coding, finally the clock coding in the picture of each lens shooting is decoded, obtains the timing code of each camera lens, then the offset of camera lens is calculated, so as to adjust the audio video synchronization of more lens shootings.
Description
Technical field
The present invention relates to panoramic video technique for taking field, and in particular to a kind of method of more camera lens audio video synchronizations.
Background technology
Panoramic video be it is a kind of carry out comprehensive 360 degree of videos shot with 3D video cameras, user is in viewing video
When, it can arbitrarily adjust video and be watched up and down.Using multiple video cameras shoot when, due to video camera it is difficult to
Shooting is started simultaneously at, so the time that the video of each video camera shooting starts is different, it is same so as to need to carry out video
Step, the time unifying by video according to reality, facilitate multiple video switching, editor or splicings.
Current more camera lens audio video synchronization technologies have following several：（1）It is synchronous by the timing code of video camera, it is necessary to during hardware
Clock is synchronous, it is necessary to custom hardware.Cost is higher, and more to the restriction ratio of equipment.（2）Camera lens re-packs, manual operation.It is difficult to
Apply in more camera lens videos, because the picture of script holder can not possibly be appeared in all camera lenses simultaneously,（3）Human-edited, manually
It is synchronous.Low precision, workload are big.（4）Pass through audio sync.Such as hand is clapped at scene, each video camera records lower sound, then
By synchronous sound come synchronization video.Shortcoming is susceptible to the interference of live sound, so that can not computer automatic aligning.Such as
The artificial listening of fruit sees that waveform aligns, less efficient.If each video camera is distant, cause each video camera
Audible difference is larger, can lead to not synchronization.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of method of more camera lens audio video synchronizations, do not have to
Custom hardware, cost is low, automatic synchronization, easy to operate.
The purpose of the present invention is achieved through the following technical solutions：
A kind of method of more camera lens audio video synchronizations, comprises the following steps：
S01：Design one group of clock encoding of graphs APP that video camera can be allowed clearly to photograph；
S02：Clock encoding of graphs APP is implanted into mobile device, and shows that the graphics clock encodes in mobile device display end；
S03：When more camera lenses start shooting, graphics clock coding starts timing, goes out the timing code that mobile device display end is shown
Before existing each video camera；
S04：By identification technology, timing code is decoded；Or timing code is gone out by manual identified, record timecode information；
S05：Calculate each camera lens offset and according to offset synchronization video.
Preferably, the unit of display of the graphics clock coding includes dividing position, second position, millisecond position composition, the millisecond position
It is made up of ten milliseconds and hundred milliseconds two.
Preferably, the unit of display of the graphics clock coding also includes the code displaying of ten milliseconds of positions of display.
Preferably, the code displaying of described ten milliseconds of positions is digital coding, is made up of 0-9 ten digits character strings, timing
0-9 font becomes big for ten milliseconds of display successively during beginning, and the maximum numeral of font display is current time under a certain moment
Ten milliseconds of positions.
Preferably, the code displaying of described ten milliseconds of positions is encoding of graphs, and the encoding of graphs includes two point positions, each
There are four kinds of color changes point position, and the digital 0-9 of ten milliseconds of positions is represented by the combination of two point positions and color change.
Preferably, four kinds of colors are black, red, green, blue, and define 0-9 display combined method.
Preferably, the identification technology in the step S04 refers to carry out gray proces to the figure photographed, then utilizes
Binary conversion treatment extraction graphics clock coding.
Preferably, it should keep stable when the mobile device display end is located at shooting before video camera, avoid rocking.
Preferably, the mobile device display end can be mobile phone or tablet personal computer.
Preferably, the specific method of the step S05 be according to obtaining the timing code of each camera lens, select one it is maximum
Timing code is as reference time code；According to maximum time code, the frame number decoded with reference to each camera lens, each camera lens is finally converted into
Frame number skew, offset mobile each camera lens to corresponding position using the frame number of calculating, realize more camera lens audio video synchronizations.
The beneficial effects of the invention are as follows：This programme can be encoded by designing one group with the clock of self-clocking, carried out entirely
When scape is shot, staff or mobile device is allowed to control clock coding to be enclosed around whole camera lenses one, so that all camera lenses are all
Current clock coding is recorded, finally the clock coding in the picture of each lens shooting is decoded, obtains each mirror
The timing code of head, the offset of camera lens is then calculated, so as to adjust the audio video synchronization of more lens shootings.
Brief description of the drawings
Fig. 1 is graphics clock coding display figure of the present invention；
Fig. 2 is ten milliseconds of site bit combination modes that the present invention defines.
Embodiment
1-2 and specific embodiment are described in further detail technical scheme below in conjunction with the accompanying drawings, but the present invention
Protection domain is not limited to as described below.
A kind of method of more camera lens audio video synchronizations, comprises the following steps：
S01：Design one group of clock encoding of graphs APP that video camera can be allowed clearly to photograph；
S02：Clock encoding of graphs APP is implanted into mobile device, and shows that the graphics clock encodes in mobile device display end；
S03：When more camera lenses start shooting, graphics clock coding starts timing, goes out the timing code that mobile device display end is shown
Before existing each video camera；
S04：By identification technology, timing code is decoded；Or timing code is gone out by manual identified, record timecode information；
S05：Calculate each camera lens offset and according to offset synchronization video.
Preferably, the unit of display of the graphics clock coding includes dividing position, second position, millisecond position composition, the millisecond position
It is made up of ten milliseconds and hundred milliseconds two.
Preferably, the unit of display of the graphics clock coding also includes the code displaying of ten milliseconds of positions of display, such as Fig. 1 institutes
Show, the code displaying of ten milliseconds of positions is digital coding, is made up of 0-9 ten digits character strings, when timing starts 0-9 font according to
Secondary change is used for greatly ten milliseconds of display, and the maximum numeral of font display is ten milliseconds of positions at current time under a certain moment；The design
The reason for be, when digital coding is shown over the display, because camera lens has the time for exposure, so that the short time can be taken
Interior two continuous motion pictures, that is, the diplopia described in us, as shown in figure 1, millisecond unit shows it is 37 instantly, and
37 previous time is 36 under the exposure of video camera, therefore 6 and 7 overlapping phenomenons occurs so that error occurs in time statistics, is
The error is eliminated, devises the digital coding of an independent display millisecond position, the digital coding shows 0-9 all numerals
String, is shown to 9, the passage of time is realized by the change of digital font, that is to say, that this nine numbers of 0-9 always since 0
Word become greater to 9 end successively since 0, is then circulated, and has often circulated and has once represented 100 milliseconds, 0-9 represents 0 milli respectively
Second, 10 milliseconds, 20 milliseconds ... 90 milliseconds；At the time of by the change of digital font so as to clearly indicate out instantly, it is easy to
Identification in successive image processing to the time, so as to calculate offset.
Preferably, the code displaying of above-mentioned ten milliseconds of positions is to be also designed to encoding of graphs, and the encoding of graphs includes
There are four kinds of color changes two point positions, each position of putting, the number of ten milliseconds of positions are represented by the combination of two point positions and color change
Word 0-9.
Preferably, four kinds of colors are black, red, green, blue, and define 0-9 display combined method, in the present embodiment
It is defined as follows：
0 is black, 1 dark red, 2 black green, 3 black blue, 4 red, 5 red green, 6 red indigo plants, 7 green and greens, 8 turquoise, 9 blue；Respectively with above-mentioned fixed
The color block of justice represents the numerical value of ten milliseconds of positions, and it is specific as shown in Figure 2.
Preferably, the identification technology in the step S04 refers to carry out gray proces to the figure photographed, then utilizes
Binary conversion treatment extraction graphics clock coding.
Designed clock is encoded, is applied in clock APP.When starting shooting, start timing.Then each take the photograph is allowed
Camera shoots the picture of clock.
Example operation is as follows：
The video that each video camera is shot, is imported into video editing tool, and the clock graphic in video is identified, according to
It is secondary including following operation.
Region segmentation：
Each lens image data is obtained successively, and image background model is established using general procedure algorithm for view data,
And the prospect of image is detected, finally give the greyscale image data for including foreground and background information；Then to obtaining
Each camera lens greyscale image data is clustered to obtain cluster result and records the up-and-down boundary point of each cluster, for each cluster
Up-and-down boundary point, the lower boundary of a upper cluster is searched using currently processed coboundary traversal, progressively traversal is searched simultaneously
Merge up-and-down boundary.It is ranked up, obtains according to intra-cluster point number is descending for the cluster after merging up-and-down boundary
To clustering order table.Clustering order table is filtered according to the minimum threshold of setting, leaves the cluster point more than minimum threshold,
Simultaneously according to cluster point coordinates value, the rectangular area that will currently be clustered on point generation image according to the upper left corner-lower right corner mode.Connect
The rectangular area for generation is effectively merged according to effective threshold value, effective rectangular area after being rejected.Finally press
Effective rectangular area after rejecting is selected and filtered according to valid interval threshold value, obtains effective rectangle region in valid interval
Domain gray-scale map.
Handle effective coverage：
Fuzzy Processing will be carried out from effective coverage gray-scale map obtained above, rim detection is carried out to fuzzy result image, and it is right
Testing result carrys out detection of straight lines using probability Hough transformation algorithm, finally extracts the edge line in multiple regions.To detecting
The straight line come is handled, and is calculated the horizontal sextant angle of each bar line, the angle class of multiple different angles is obtained, then to these angles
Whether class is clustered, have common portion to cluster again according to line segment translation each cluster, obtain angle cluster set.Again
The rectangle formed according to angle cluster set calculates the common portion of two rectangles, and extracts the straightway near common portion, structure
Into candidate target rectangle, real rectangle is ultimately formed.Clock graphic is finally extracted from gray-scale map according to these rectangles.
Identification numeral：
Binary conversion treatment is carried out to obtained clock gray level image, obtained binaryzation model is as template, to the binaryzation mould
Type carries out binaryzation point cluster, and the cluster set of obtained point is formed into rectangular area according to point coordinates.These rectangular areas are pressed
It is ranked up according to area size is descending, obtains rectangular area ordered list.And then this table is filtered, rejects head mistake
Big and too small afterbody rectangle, obtain effective rectangular area set.These effective coverages are gathered and divided according to horizontal linear
Cut, two rectangular areas set up and down is obtained after segmentation, continues to filter the two set, rejecting head is excessive and afterbody
Too small rectangular area, obtain final effective two rectangular area set up and down.Use upper and lower two effective rectangular area collection
Conjunction is handled clock gray-scale map, the gray-scale map pixel value in effective coverage is filled into 255, and extract in effective coverage
Digital picture.Image recognition finally is carried out to the digital picture of extraction using general-purpose algorithm, obtains real numeral.Finally, by
The timing code that these numerals are formed required for synchronization video.
Preferably, it should keep stable when the mobile device display end is located at shooting before video camera, avoid rocking, movement is set
Standby display end can be mobile phone or tablet personal computer.
Preferably, the specific method of the step S05 be according to obtaining the timing code of each camera lens, select one it is maximum
Timing code is as reference time code；According to maximum time code, the frame number decoded with reference to each camera lens, each camera lens is finally converted into
Frame number skew, offset mobile each camera lens to corresponding position using the frame number of calculating, realize more camera lens audio video synchronizations.
Described above is only the preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form, the exclusion to other embodiment is not to be taken as, and can be used for various other combinations, modification and environment, and can be at this
In the text contemplated scope, it is modified by the technology or knowledge of above-mentioned teaching or association area.And those skilled in the art are entered
Capable change and change does not depart from the spirit and scope of the present invention, then all should be in the protection domain of appended claims of the present invention
It is interior.
Claims (10)
- A kind of 1. method of more camera lens audio video synchronizations, it is characterised in that comprise the following steps：S01：Design one group of clock encoding of graphs APP that video camera can be allowed clearly to photograph；S02：Clock encoding of graphs APP is implanted into mobile device, and shows that the graphics clock encodes in mobile device display end；S03：When more camera lenses start shooting, graphics clock coding starts timing, goes out the timing code that mobile device display end is shown Before existing each video camera；S04：By identification technology, timing code is decoded；Or timing code is gone out by manual identified, record timecode information；S05：Calculate each camera lens offset and according to offset synchronization video.
- A kind of 2. method of more camera lens audio video synchronizations according to claim 1, it is characterised in that the graphics clock coding The unit of display include divide position, second position, millisecond position composition, the millisecond position is made up of ten milliseconds and hundred milliseconds two.
- A kind of 3. method of more camera lens audio video synchronizations according to claim 2, it is characterised in that the graphics clock coding The unit of display also include display ten milliseconds of positions code displaying.
- A kind of 4. method of more camera lens audio video synchronizations according to claim 3, it is characterised in that described ten milliseconds of positions it is aobvious It is digital coding to show coding, is made up of 0-9 ten digits character strings, and 0-9 font becomes big and is used to show successively when timing starts Ten milliseconds, the maximum numeral of font display is ten milliseconds of positions at current time under a certain moment.
- A kind of 5. method of more camera lens audio video synchronizations according to claim 3, it is characterised in that described ten milliseconds of positions it is aobvious It is encoding of graphs to show coding, and the encoding of graphs includes two point positions, and there are four kinds of color changes each position of putting, passes through two point positions Combination with color change represents the digital 0-9 of ten milliseconds of positions.
- 6. the method for a kind of more camera lens audio video synchronizations according to claim 5, it is characterised in that four kinds of colors are Black, red, green, blue, and define 0-9 display combined method.
- 7. the method for a kind of more camera lens audio video synchronizations according to claim 1, it is characterised in that in the step S04 Identification technology refers to carry out gray proces to the figure photographed, then utilizes binary conversion treatment to extract graphics clock and encode.
- 8. the method for a kind of more camera lens audio video synchronizations according to claim 1, it is characterised in that the mobile device is shown End should keep stable when being shot before video camera, avoid rocking.
- 9. the method for a kind of more camera lens audio video synchronizations according to claim 8, it is characterised in that the mobile device is shown End can be mobile phone or tablet personal computer.
- A kind of 10. method of more camera lens audio video synchronizations according to claim 1, it is characterised in that the tool of the step S05 Body method is that basis obtains the timing code of each camera lens, selects a maximum timing code as reference time code；According to maximum Timing code, the frame number decoded with reference to each camera lens, the frame number skew of each camera lens is finally converted into, is offset using the frame number of calculating Mobile each camera lens position corresponding to, realizes more camera lens audio video synchronizations.
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| CN110290287A (en) * | 2019-06-27 | 2019-09-27 | 上海玄彩美科网络科技有限公司 | Multi-cam frame synchornization method |
| CN111464807A (en) * | 2020-04-13 | 2020-07-28 | 广东星舆科技有限公司 | Binocular synchronization measuring method and system |
| CN111457917A (en) * | 2020-04-13 | 2020-07-28 | 广东星舆科技有限公司 | Multi-sensor time synchronization measuring method and system |
| CN114449260A (en) * | 2022-03-09 | 2022-05-06 | 深圳锐视智芯科技有限公司 | Frame synchronization test system and method |
| CN114461165A (en) * | 2022-02-09 | 2022-05-10 | 浙江博采传媒有限公司 | Virtual-real camera picture synchronization method, device and storage medium |
| CN117041691A (en) * | 2023-10-08 | 2023-11-10 | 湖南云上栏山数据服务有限公司 | Analysis method and system for ultra-high definition video material based on TC (train control) code |
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| CN111464807A (en) * | 2020-04-13 | 2020-07-28 | 广东星舆科技有限公司 | Binocular synchronization measuring method and system |
| CN111457917A (en) * | 2020-04-13 | 2020-07-28 | 广东星舆科技有限公司 | Multi-sensor time synchronization measuring method and system |
| CN114461165A (en) * | 2022-02-09 | 2022-05-10 | 浙江博采传媒有限公司 | Virtual-real camera picture synchronization method, device and storage medium |
| CN114449260A (en) * | 2022-03-09 | 2022-05-06 | 深圳锐视智芯科技有限公司 | Frame synchronization test system and method |
| CN117041691A (en) * | 2023-10-08 | 2023-11-10 | 湖南云上栏山数据服务有限公司 | Analysis method and system for ultra-high definition video material based on TC (train control) code |
| CN117041691B (en) * | 2023-10-08 | 2023-12-08 | 湖南云上栏山数据服务有限公司 | Analysis method and system for ultra-high definition video material based on TC (train control) code |
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