CN104967803B - A kind of video recording method and device - Google Patents
A kind of video recording method and device Download PDFInfo
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- CN104967803B CN104967803B CN201510382786.2A CN201510382786A CN104967803B CN 104967803 B CN104967803 B CN 104967803B CN 201510382786 A CN201510382786 A CN 201510382786A CN 104967803 B CN104967803 B CN 104967803B
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Abstract
The embodiment of the invention discloses a kind of video recording method and device, wherein, described video recording method includes：In recorded video, the target following object in selected video is tracked, the translational speed of the target following object is determined based on tracking result；According to the translational speed of the target following object, adjustment current video records frame per second.The technical scheme provided using the embodiment of the present invention, can realize can accurately adjust current video shooting speed when recording fast moving objects so that the video effect of shooting is more preferable, improves the experience that user shoots video.
Description
Technical field
The present embodiments relate to video record field, more particularly to a kind of video recording method and device.
Background technology
With the high speed development of intelligent terminal technology, smart terminal product can meet that the increasing function of user is realized
Demand.Meanwhile the demand that user uses for multiple functions is also further urgent.Such as it may move because smart terminal product has
Property, it is easy to carry about with one, increasing user selection is used for being taken pictures, video record etc..
When people are imaged or recorded a video to mobile people, animal or object (being referred to as " subject "), typically can all adopt
With tracing algorithm come track up thing, and the object space tracked is shown with picture concerned, the subject traced into is focused
Operation, allows subject to be constantly in a comparison clearly scene, but for the subject in quick mobile status, recording
Video performance can be still that comparison is fuzzy, influence the experience that user shoots video.
The content of the invention
In view of this, the embodiment of the present invention proposes a kind of video recording method and device, to realize in video record process
In, lift the video record effect to tracking object.
On the one hand, the embodiments of the invention provide a kind of video recording method, methods described to include：
In recorded video, the target following object in selected video is tracked, determined based on tracking result
The translational speed of the target following object；
According to the translational speed of the target following object, adjustment current video records frame per second.
On the other hand, the embodiment of the present invention additionally provides a kind of video recording device, and described device includes：
Translational speed acquisition module, in recorded video, receiving the selection to target following object, obtain the mesh
The translational speed of mark tracking object；
Number of image frames adjusting module, for the translational speed according to the target following object, adjustment current video is recorded
Captured number of image frames per second.
Method and device provided in an embodiment of the present invention, by recorded video, receiving the choosing to target following object
Take, obtain the translational speed of the target following object, and forward sight is worked as according to the translational speed of the target following object, adjustment
Frequency records captured number of image frames per second.Current video bat can accurately be adjusted when recording fast moving objects by realizing
Take the photograph speed so that the video effect of shooting is more preferable, improves the experience that user shoots video.
Brief description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, of the invention is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 is the flow chart for the video recording method that first embodiment of the invention provides；
Fig. 2 is the flow chart for the video recording method that second embodiment of the invention provides；
Fig. 3 is the flow chart for the video recording method that third embodiment of the invention provides；
Fig. 4 is the flow chart for the video recording method that fourth embodiment of the invention provides；
Fig. 5 is the structural representation for the video recording device that fifth embodiment of the invention provides.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is only used for explaining the present invention, rather than limitation of the invention.It also should be noted that for the ease of
Describe, part related to the present invention rather than full content are illustrate only in accompanying drawing.
Fig. 1 shows the first embodiment of the present invention.
Fig. 1 be first embodiment of the invention provide a kind of video recording method schematic flow sheet, the side of the present embodiment
Method can be performed by video recording device, and the device can be realized by way of hardware and/or software, and can typically integrate
In in intelligent terminal.
Referring to Fig. 1, described video recording method includes：
Step S101, in recorded video, the target following object in selected video is tracked, based on tracking
As a result the translational speed of the target following object is determined.
When using intelligent terminal recorded video, intelligent terminal by receive the corresponding operational order of user choose target with
Track object.For example, receiving the operation for clicking on the object shown on screen, and the object clicked on is defined as target following thing
Body.User can choose target following object when video starts to record or in recording process, can also start to record in video
Before system, by showing default frames images on screen, user's movement or the operation of zoom described image frame are received, it is determined that
Object in described image frame is target following object.
The tracking of object is exactly that the position of target following object is determined in each two field picture of video.Choosing target
, it is necessary to be detected to target following object after tracking object.In the present embodiment, due to shooting when intelligent terminal do not enter
Row is mobile or rotates, and captured reference background model can use background subtraction to target following near not changing
Object is detected.Background subtraction be using the present frame in image sequence and reference background model relatively come detect target with
A kind of method of track object.It is excellent to have that speed is fast, detection is accurate, is easily achieved etc. using background subtraction detection moving target
Point.By removing the reference background model in each two field picture, target following object in each two field picture can be accurately got
Position.
Because the shooting interval time of each two field picture is certain value, by the target following object in different frame figure
The translational speed of the target following object is calculated in the time interval of change in location and the different two field pictures as in.
Step S102, according to the translational speed of the target following object, adjustment current video records frame per second.
The translational speed of target following object according to acquired in step S101, according to the shifting of default target following object
The corresponding relation of dynamic speed and video record frame per second, adjustment current video record frame per second.Video record frame per second is in the unit time
The quantity of interior captured picture frame.Using the video that high video record frame per second is recorded when playing, video can be made more
It is smooth, true to nature.If the speed of target following object is faster, then just needs to improve current video recording frame per second, to record
The video of system will not make spectators feel image interim card when playing because of the high-speed motion of target following object, not smooth.
Intelligent terminal can be adjusted current video by the way of hardware and/or software and record frame per second, for example, for peace
Tall and erect system, it be able to can also be led to using calling setVideoFrameRate built-in functions to realize the adjustment to video record frame per second
Modification video recording device parameter, such as the hardware parameter of modification camera are crossed to realize.
The present embodiment obtains the target following thing by recorded video, receiving the selection to target following object
The translational speed of body, and captured figure per second is recorded according to the translational speed of the target following object, adjustment current video
As frame number.Current video shooting speed can accurately be adjusted when recording fast moving objects by realizing so that shooting regards
Yupin effect is more preferable, improves the experience that user shoots video.
Fig. 2 shows the second embodiment of the present invention.
Fig. 2 is the schematic flow sheet for the video recording method that second embodiment of the invention provides.The video recording method
Based on first embodiment of the invention, further, by the translational speed according to the target following object, forward sight is worked as in adjustment
Frequency records frame per second, is optimized for：When the translational speed of the target following object is more than default normal movement speed, institute is calculated
State the translational speed of target following object and the ratio of default normal movement speed；Default regard according to the ratio and normally
Frequency records frame per second, calculates and adjusts current video and records frame per second.
Referring to Fig. 2, the video recording method, including：
Step S201, in recorded video, the target following object in selected video is tracked, based on tracking
As a result the translational speed of the target following object is determined.
Step S202, when the translational speed of the target following object is more than default normal movement speed, calculate institute
State the translational speed of target following object and the ratio of default normal movement speed.
By the translational speed of the target following object acquired in step S201 compared with normal movement speed.Described
Normal movement speed is preset by user or system.It is more than default normal movement in the translational speed of target following object
During speed, the translational speed of the target following object and the ratio of default normal movement speed are calculated.It is for example, presently described
The translational speed of target following object is 10 meter per seconds, and normal movement speed set in advance is 4 meter per seconds, target following object
The ratio of translational speed and default normal movement speed be 10/4=2.5.
Step S203, frame per second is recorded according to the ratio and default normal video, calculate and adjust current video recording
Frame per second.
Frame per second is recorded according to the step S202 ratios being calculated and default normal video, current video is calculated and records
Frame per second.The default normal video record frame per second be camera device in normal record, the number of recorded picture frame per second
Amount.Normally for video record frame per second in 17 frames/frame of second -30/between the second, normal video records frame per second can be by user or system
Preset.In the present embodiment, it is preferably 30 frames/second that normal video, which records frame per second,.According to the ratio and default normal
Video record frame per second, current video can be calculated and record frame per second, be specially：Normal video recording frame per second is multiplied with ratio, will
Result of product records frame per second as current video.For example, the ratio is 1.5, it is 30 frames/second that normal video, which records frame per second, when
Preceding video record frame per second is then 1.5 × 30 frames/second=45 frames/second.According to the recording frame per second adjustment current video record being calculated
Frame per second processed.
The present embodiment passes through the translational speed according to the target following object, adjustment current video recording frame per second is excellent
Turn to：When the translational speed of the target following object is more than default normal movement speed, the target following thing is calculated
The ratio of the translational speed of body and default normal movement speed；Frame per second is recorded according to the ratio and default normal video,
Calculate and adjust current video and record frame per second.Adjusted current video is enabled to record frame per second and the shifting of target following object
Dynamic speed matches, and avoids adjusted current video from recording frame per second excessive or too small.Make the video of the target following object of recording
More press close to the truth of target following object movement, improve the experience of user's recorded video.
Fig. 3 shows the third embodiment of the present invention.
Fig. 3 is the schematic flow sheet for the video recording method that third embodiment of the invention provides.The video recording method
Based on first embodiment of the invention, further, by the translational speed according to the target following object, forward sight is worked as in adjustment
Frequency records frame per second, is optimized for：, will be current when the translational speed of the target following object is less than default normal movement speed
The picture frame that recorded video is captured carries out frame losing processing according to default rule.
Referring to Fig. 3, the video recording method, including：
Step S301, in recorded video, the target following object in selected video is tracked, based on tracking
As a result the translational speed of the target following object is determined.
Step S302, when the translational speed of the target following object is less than default normal movement speed, will currently it record
The picture frame that video processed is captured carries out frame losing processing according to default rule.
The movement of target following object can be high-speed motion or low-speed motion.Thing is tracked for slower-velocity target
The recording of body, recorded if still recording frame per second using normal video, and without any processing, the video recorded exists
During broadcasting, user can be allowed to feel that video display effect is not smooth.Therefore, it is necessary to be regarded to what is recorded using normal video recording frame per second
Frequency is handled.
It is described by the translational speed of the target following object acquired in step S301 compared with normal movement speed
Normal movement speed is preset by user or system.It is less than default normal movement speed in the translational speed of target following object
When spending, the picture frame that current recorded video is captured is subjected to frame losing processing according to default rule, is specially：Calculate the mesh
The ratio of the translational speed and default normal movement speed of mark tracking object；According to the ratio and normal per second acquired
Frame number determines retained frame number per second；And carried out according to the retained frame number per second and normal acquired frame number per second
Packet, abandon the two field picture of identical cis-position in each packet.
For example, the translational speed of target following object is 2 meter per seconds, normal movement speed set in advance is 4 meter per seconds, institute
The ratio of the translational speed and default normal movement speed of stating target following object is 1/2.Normal acquired frame number per second
For 30 frames, then retained frame number per second is 30 × 1/2=15 frames, this also means that abandoned frame number per second is 30-15=
15 frames.Normal 30 acquired two field pictures per second are divided into 15 groups, abandon the in the first two field picture in every group or every group
Two two field pictures.
The present embodiment passes through the translational speed according to the target following object, adjustment current video recording frame per second is excellent
Turn to：When the translational speed of the target following object is less than default normal movement speed, current recorded video is grabbed
The picture frame taken carries out frame losing processing according to default rule.When the target following object is in microinching state, adjust
The number of image frames that whole current recorded video is captured so that the frame per second of the video of recording and the translational speed phase of target following object
Unanimously, the experience of user's recorded video is improved.
Fig. 4 shows the fourth embodiment of the present invention.
Fig. 4 is the schematic flow sheet for the video recording method that fourth embodiment of the invention provides.The video recording method
Based on first embodiment of the invention, further, the target following object in selected video is tracked, base
Before the translational speed that tracking result determines the target following object, increase following steps：Monitor default object with
Track is opened event and is triggered.
Referring to Fig. 4, the video recording method, including：
Step S401, monitor that default object tracking is opened event and is triggered.
User is when recorded video, if it find that target following object is in quick or microinching state, can
Operation is opened to carry out object tracking to intelligent terminal.
Therefore, in the present embodiment, in real time to object tracking open event be monitored, it is determined whether get object with
Track opens event.The object tracking is opened trigger event and can preset by system or user, can be to intelligent end
Hold the setting trigger action of main touch-screen, or the trigger action to one or more physical buttons in terminal.Exemplary,
Event is opened to object tracking to be monitored, can be specially in real time：The slip behaviour to recorded video interface is monitored whether in real time
Make, if it is, monitoring that default object tracking is opened event and is triggered.
Step S402, in recorded video, the target following object in selected video is tracked, based on tracking
As a result the translational speed of the target following object is determined.
Step S403, according to the translational speed of the target following object, adjustment current video records frame per second.
The present embodiment is tracked by the target following object in selected video, is determined based on tracking result
Before the translational speed of the target following object, increase following steps：Monitor that default object tracking is opened event and touched
Hair.The motion state according to object during recorded video is allowed users to, chooses whether to be tracked object.
On the basis of above-mentioned technical proposal, in the present embodiment, in above-mentioned steps S403 " according to the target following thing
The translational speed of body, adjustment current video record frame per second " after, it can also increase following steps：Monitor default object tracking
After close event is triggered, it is that default normal video records frame per second that adjustment current video, which records frame per second,.
When recorded video, user can cancel the tracking to target following object as needed, can be to intelligence
Terminal carries out object tracking shutoff operation.The object tracking open and close event can be preset by system or user.
Exemplary, object tracking close event is monitored in real time, can be specially：Whether monitor in real time has to recorded video interface
Double click operation, if it is, monitoring that default object tracking close event is triggered.Monitoring default object tracking pass
After the event of closing is triggered, it is probably video record frame per second after adjustment, it is necessary to by current video to record frame per second due to current video
Record frame per second and be adjusted to normal video record frame per second.For example, after monitoring that default object tracking close event is triggered,
It is 45 frames/second that current video, which records frame per second, and current video is recorded into frame per second is adjusted to normal video recording frame per second 30 by 45 frames/second
Frame/second.
Fig. 5 shows the fifth embodiment of the present invention.
Fig. 5 is the structure chart for the video recording device that fifth embodiment of the invention provides.Referring to Fig. 5, the video record
Device includes：Translational speed determining unit 510 and frame rate adjustment unit 520.
Wherein, the translational speed determining unit 510, in recorded video, to the target in selected video
Tracking object is tracked, and the translational speed of the target following object is determined based on tracking result；
The frame rate adjustment unit 520, for the translational speed according to the target following object, adjustment current video record
Frame per second processed.
The video recording device that the present embodiment provides, by recorded video, receiving the selection to target following object,
The translational speed of the target following object is obtained, and according to the translational speed of the target following object, adjusts current video
Record captured number of image frames per second.Current video shooting can accurately be adjusted when recording fast moving objects by realizing
Speed so that the video effect of shooting is more preferable, improves the experience that user shoots video.
Further, the frame rate adjustment unit 520, including：Ratio calculation subelement 521 and recording frame per second adjustment are single
Member 522
Wherein, the ratio calculation subelement 521, it is default for being more than in the translational speed of the target following object
During normal movement speed, the translational speed of the target following object and the ratio of default normal movement speed are calculated；
The recording frame per second adjustment subelement 522, for recording frame per second, meter according to the ratio and default normal video
Calculate and adjust current video and record frame per second.
Further, the frame rate adjustment unit 520, including：Frame losing handles subelement 523.
Wherein, the frame losing processing subelement 523, it is default for being less than in the translational speed of the target following object
During normal movement speed, the picture frame that current recorded video is captured is subjected to frame losing processing according to default rule.
Further, described device also includes：Event triggers monitoring unit 530.
The event triggers monitoring unit 530, is triggered for monitoring that default object tracking opens event.
Further, described device also includes：Normal frame rate adjustment unit 540.
The normal frame rate adjustment unit 540, after monitoring that default object tracking close event is triggered, adjustment
It is that default normal video records frame per second that current video, which records frame per second,.
Above-mentioned video recording device can perform the video recording method that the embodiment of the present invention is provided, and possess execution method phase
The functional module and beneficial effect answered.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Will be appreciated by those skilled in the art that above-mentioned each module of the invention or each step can use general meter
Device is calculated to realize, they can be concentrated on single computing device, or are distributed in the network that multiple computing devices are formed
On, alternatively, they can be realized with the program code that computer installation can perform, so as to be stored in storage
Performed in device by computing device, they are either fabricated to each integrated circuit modules respectively or will be more in them
Individual module or step are fabricated to single integrated circuit module to realize.So, the present invention be not restricted to any specific hardware and
The combination of software.
Each embodiment in this specification is described by the way of progressive, what each embodiment stressed be with
The difference of other embodiment, same or analogous part between each embodiment mutually referring to.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For, the present invention can have various changes and change.All any modifications made within spirit and principles of the present invention, it is equal
Replace, improve etc., it should be included in the scope of the protection.
Claims (4)
- A kind of 1. video recording method, it is characterised in that applied in shooting intelligent terminal without field that is mobile or rotating Scape, described method include：In recorded video, by monitoring the slide at recorded video interface in real time, monitor that default object tracking is opened Event is triggered；When using intelligent terminal recorded video, target is determined in the operational order of video clip click object by receiving user Object is tracked, or before video starts recording, by showing default frames images on screen, receives user's movement or amplification The operation of described image frame is reduced, it is target following object to determine the object in described image frame；Target following object in selected video is tracked using background subtraction, based on described in tracking result determination The translational speed of target following object；According to the translational speed of the target following object, adjustment current video records frame per second, including：When the translational speed of the target following object is more than default normal movement speed, the target following object is calculated Translational speed and default normal movement speed ratio；By monitoring the double click operation at recorded video interface in real time, after monitoring that default object tracking close event is triggered, It is that default normal video records frame per second to adjust current video and record frame per second；Frame per second is recorded according to the ratio and default normal video, calculates and adjusts current video and record frame per second, wherein, it is described The image frames numbers that video record frame per second is recorded by the intelligent terminal in the unit time.
- 2. according to the method for claim 1, it is characterised in that according to the translational speed of the target following object, adjustment Current video records frame per second, including：When the translational speed of the target following object is less than default normal movement speed, current recorded video is captured Picture frame according to default rule carry out frame losing processing.
- A kind of 3. video recording device, it is characterised in that applied in shooting intelligent terminal without field that is mobile or rotating Scape, described device include：Event triggers monitoring unit, in recorded video, by monitoring the slide at recorded video interface in real time, monitoring Event is opened to default object tracking to be triggered；Translational speed determining unit, for when using intelligent terminal recorded video, being clicked on by receiving user in video clip The operational order of object determines target following object, or before video starts recording, by showing default figure on screen Frame, user's movement or the operation of zoom described image frame are received, it is target following to determine the object in described image frame Object；Target following object in selected video is tracked using background subtraction, institute is determined based on tracking result State the translational speed of target following object；Frame rate adjustment unit, for the translational speed according to the target following object, adjustment current video records frame per second, bag Include：Ratio calculation subelement, for when the translational speed of the target following object is more than default normal movement speed, Calculate the translational speed of the target following object and the ratio of default normal movement speed；Normal frame rate adjustment unit, for the double click operation by monitoring recorded video interface in real time, monitor default object After tracking close event is triggered, it is that default normal video records frame per second that adjustment current video, which records frame per second,；Frame per second adjustment subelement is recorded, for recording frame per second according to the ratio and default normal video, calculates and adjusts and work as Preceding video record frame per second, wherein, the number of image frames that the video record frame per second is recorded by the intelligent terminal in the unit time Amount.
- 4. device according to claim 3, it is characterised in that the frame rate adjustment unit, including：Frame losing handles subelement, for when the translational speed of the target following object is less than default normal movement speed, The picture frame that current recorded video is captured is subjected to frame losing processing according to default rule.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111526314A (en) * | 2020-04-24 | 2020-08-11 | 华为技术有限公司 | Video shooting method and electronic equipment |
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