CN104967803A - Video recording method and video recording device - Google Patents
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Abstract
The embodiment of the invention discloses a video recording method and a video recording device. The video recording method comprises the steps of tracking a target tracking object in selected video when the video is recorded, and determining the moving speed of the target tracking object based on a tracking result; and adjusting the current video recording frame rate according to the moving speed of the target tracking object. By adopting the technical scheme provided by the embodiment of the invention, the current video shooting speed can be accurately adjusted when a fast moving object is recorded, thereby enabling the shot video to be better in effect, and improving the video shooting experience of users.
Description
Technical field
The embodiment of the present invention relates to video record field, particularly relates to a kind of video recording method and device.
Background technology
Along with the high speed development of intelligent terminal technology, smart terminal product can meet the increasing functional realiey demand of user.Meanwhile, the demand that uses for several functions of user is also further urgent.As there is mobility due to smart terminal product, be easy to carry about with one, increasing user select to be used for carry out to take pictures, video record etc.
When people make a video recording to the people of movement, animal or object (being referred to as " subject ") or record a video, generally tracing algorithm all can be adopted to carry out track up thing, and the object space followed the tracks of is shown by picture concerned, focus operation is done to the subject traced into, allow subject be in a scene more clearly always, but for being in the subject of fast moving state, can be still fuzzyyer in the video performance of recording, affecting the experience of user's capture video.
Summary 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, promotes the video record effect to tracking object.
On the one hand, embodiments provide a kind of video recording method, described method comprises:
When recorded video, the target following object in selected video is followed the tracks of, determine the translational speed of described target following object based on tracking results;
According to the translational speed of described 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 comprises:
Translational speed acquisition module, for when recorded video, receives choosing target following object, obtains the translational speed of described target following object;
Number of image frames adjusting module, for the translational speed according to described target following object, adjustment current video records captured number of image frames per second.
The method that the embodiment of the present invention provides and device, by when recorded video, receive choosing target following object, obtain the translational speed of described target following object, and according to the translational speed of described target following object, adjustment current video records captured number of image frames per second.Achieve and can accurately adjust current video shooting speed when recording fast moving objects, make the video effect of shooting better, improve the experience of user's capture video.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the flow chart of the video recording method that first embodiment of the invention provides;
Fig. 2 is the flow chart of the video recording method that second embodiment of the invention provides;
Fig. 3 is the flow chart of the video recording method that third embodiment of the invention provides;
Fig. 4 is the flow chart of the video recording method that fourth embodiment of the invention provides;
Fig. 5 is the structural representation of the video recording device that fifth embodiment of the invention provides.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content.
Fig. 1 illustrates the first embodiment of the present invention.
Fig. 1 is the schematic flow sheet of a kind of video recording method that first embodiment of the invention provides, and the method for the present embodiment can be performed by video recording device, and this device realizes by the mode of hardware and/or software, and generally can be integrated in intelligent terminal.
See Fig. 1, described video recording method comprises:
Step S101, when recorded video, follows the tracks of the target following object in selected video, determines the translational speed of described target following object based on tracking results.
When using intelligent terminal recorded video, intelligent terminal chooses target following object by receiving the corresponding operational order of user.Such as, receive the operation clicking the object that screen shows, and clicked object is defined as target following object.User can choose target following object when video starts to record or in recording process, also can before video starts recording, by showing default frames images on screen, receive user to move or the operation of frames images described in Scalable, determine that the object in described frames images is target following object.
The tracking of object is exactly the position determining target following object in each two field picture of video.After choosing target following object, need to detect target following object.In the present embodiment, because when taking, intelligent terminal does not carry out moving or rotating, captured reference background model, near not change, can adopt background subtraction to detect target following object.Background subtraction is a kind of method adopting the present frame in image sequence and reference background model relatively to detect target following object.Speed is fast, detection is accurate, be easy to the advantages such as realization to use background subtraction detection moving target to have.By removing the reference background model in each two field picture, the position of target following object in each two field picture can be got accurately.
The shooting interval time due to each two field picture is certain value, by calculating the translational speed of described target following object to the time interval of the change in location of described target following object in different frame image and described different frame image.
Step S102, according to the translational speed of described target following object, adjustment current video records frame per second.
According to the translational speed of the target following object that step S101 obtains, according to the translational speed of target following object preset and the corresponding relation of video record frame per second, adjustment current video records frame per second.Video record frame per second is the quantity of the picture frame captured within the unit time.The video adopting high video record frame per second to record, when playing, can make video more smooth, true to nature.If the speed of target following object is faster, so just needs to improve current video and record frame per second, to make the video recorded when playing, image card pauses spectators will to be felt because of the high-speed motion of target following object, not smooth.
Intelligent terminal can adopt the mode of hardware and/or software to record frame per second to adjust current video, such as, for Android system, the adjustment of calling setVideoFrameRate built-in function to realize to video record frame per second can be adopted, also can by amendment video recording device parameter, the hardware parameter such as revising camera realizes.
The present embodiment by when recorded video, receives choosing target following object, obtains the translational speed of described target following object, and according to the translational speed of described target following object, adjustment current video records captured number of image frames per second.Achieve and can accurately adjust current video shooting speed when recording fast moving objects, make the video effect of shooting better, improve the experience of user's capture video.
Fig. 2 illustrates the second embodiment of the present invention.
Fig. 2 is the schematic flow sheet of the video recording method that second embodiment of the invention provides.Described video recording method is based on first embodiment of the invention, further, by the translational speed according to described target following object, adjustment current video records frame per second, be optimized for: when the translational speed of described target following object is greater than default normal translational speed, calculate the translational speed of described target following object and the ratio of the normal translational speed preset; Record frame per second according to described ratio and default normal video, calculate and adjust current video and record frame per second.
See Fig. 2, described video recording method, comprising:
Step S201, when recorded video, follows the tracks of the target following object in selected video, determines the translational speed of described target following object based on tracking results.
Step S202, when the translational speed of described target following object is greater than default normal translational speed, calculates the translational speed of described target following object and the ratio of the normal translational speed preset.
Translational speed and the normal translational speed of the target following object obtained by step S201 compare.Described normal translational speed is preset by user or system.When the translational speed of target following object is greater than default normal translational speed, calculate the translational speed of described target following object and the ratio of the normal translational speed preset.Such as, the translational speed of current described target following object is 10 meter per seconds, and the normal translational speed preset is 4 meter per seconds, and the translational speed of target following object is 10/4=2.5 with the ratio of the normal translational speed preset.
Step S203, records frame per second according to described ratio and default normal video, calculates and adjust current video to record frame per second.
The ratio calculated according to step S202 and the normal video preset record frame per second, calculate current video and record frame per second.Described default normal video record frame per second be camera head when normally recording, the quantity of recorded picture frame per second.Normally video record frame per second in 17 frames/second ,-30 frames/between second, record frame per second and can be preset by user or system by normal video.In the present embodiment, normal video is recorded frame per second and is preferably 30 frames/second.Record frame per second according to described ratio and default normal video, current video can be calculated and record frame per second, be specially: normal video is recorded frame per second and is multiplied with ratio, result of product is recorded frame per second as current video.Such as, described ratio is 1.5, normal video record frame per second be 30 frames/second, current video record frame per second be then 1.5 × 30 frames/second=45 frames/second.Recording frame per second adjustment current video according to calculating records frame per second.
The present embodiment passes through the translational speed according to described target following object, adjustment current video records frame per second, be optimized for: when the translational speed of described target following object is greater than default normal translational speed, calculate the translational speed of described target following object and the ratio of the normal translational speed preset; Record frame per second according to described ratio and default normal video, calculate and adjust current video and record frame per second.Make adjusted current video record frame per second to match with the translational speed of target following object, avoid adjusted current video to record 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 illustrates the third embodiment of the present invention.
Fig. 3 is the schematic flow sheet of the video recording method that third embodiment of the invention provides.Described video recording method is based on first embodiment of the invention, further, by the translational speed according to described target following object, adjustment current video records frame per second, be optimized for: when the translational speed of described target following object is less than default normal translational speed, the picture frame current recorded video captured carries out frame losing process according to the rule preset.
See Fig. 3, described video recording method, comprising:
Step S301, when recorded video, follows the tracks of the target following object in selected video, determines the translational speed of described target following object based on tracking results.
Step S302, when the translational speed of described target following object is less than default normal translational speed, the picture frame current recorded video captured carries out frame losing process according to the rule preset.
The movement of target following object can be high-speed motion, also can be low-speed motion.For the recording of slower-velocity target tracking object, record if still adopt normal video to record frame per second, and without any process, the video recorded is when playing, and user can be allowed to feel, and video display effect is not smooth.Therefore, the video to adopting normal video recording frame per second to record is needed to process.
Translational speed and the normal translational speed of the target following object obtained by step S301 compare, and described normal translational speed is preset by user or system.When the translational speed of target following object is less than default normal translational speed, the picture frame current recorded video captured carries out frame losing process according to the rule preset, and is specially: calculate the translational speed of described target following object and the ratio of the normal translational speed preset; According to described ratio and normally obtained frame number per second determine retained frame number per second; And according to described retained frame number per second and normally obtained frame number per second divide into groups, abandon the two field picture of identical cis-position in each grouping.
Such as, the translational speed of target following object is 2 meter per seconds, and the normal translational speed preset is 4 meter per seconds, and the translational speed of described target following object is 1/2 with the ratio of the normal translational speed preset.Normally obtained frame number per second is 30 frames, then retained frame number per second is 30 × 1/2=15 frame, and this also means that abandoned frame number per second is 30-15=15 frame.Normal 30 obtained two field pictures per second are divided into 15 groups, abandon the first two field picture in every group or the second two field picture often in group.
The present embodiment passes through the translational speed according to described target following object, adjustment current video records frame per second, be optimized for: when the translational speed of described target following object is less than default normal translational speed, the picture frame current recorded video captured carries out frame losing process according to the rule preset.When described target following object is in microinching state, adjust the number of image frames that current recorded video captures, make the frame per second of the video recorded consistent with the translational speed of target following object, improve the experience of user's recorded video.
Fig. 4 illustrates the fourth embodiment of the present invention.
Fig. 4 is the schematic flow sheet of the video recording method that fourth embodiment of the invention provides.Described video recording method is based on first embodiment of the invention, further, target following object in selected video is being followed the tracks of, determine the translational speed of described target following object based on tracking results before, increase following steps: monitor default object tracking open event and be triggered.
See Fig. 4, described video recording method, comprising:
Step S401, monitors default object tracking open event and is triggered.
User, when recorded video, if find that target following object is in fast or microinching state, can carry out object tracking open operation to intelligent terminal.
Therefore, in the present embodiment, in real time object tracking open event is monitored, determine whether to get object tracking open event.Described object tracking is opened trigger event and can be preset by system or user, can be the setting trigger action to the main touch-screen of intelligent terminal, or the trigger action to physical button one or more in terminal.Exemplary, in real time object tracking open event is monitored, can be specially: whether Real-Time Monitoring has the slide to recorded video interface, if so, monitor default object tracking open event and be triggered.
Step S402, when recorded video, follows the tracks of the target following object in selected video, determines the translational speed of described target following object based on tracking results.
Step S403, according to the translational speed of described target following object, adjustment current video records frame per second.
The present embodiment, by following the tracks of the target following object in selected video, before determining the translational speed of described target following object, increases following steps: monitor default object tracking open event and be triggered based on tracking results.Enable user according to the motion state of object during recorded video, select whether to follow the tracks of object.
On the basis of technique scheme, in the present embodiment, after above-mentioned steps S403 " according to the translational speed of described target following object; adjustment current video records frame per second ", also following steps can be increased: monitor after default object tracking close event is triggered, it is that default normal video records frame per second that adjustment current video records frame per second.
When recorded video, user can cancel the tracking to target following object as required, can carry out object tracking shutoff operation to intelligent terminal.Described object tracking open and close event can be preset by system or user.Exemplary, in real time object tracking close event is monitored, can be specially: whether real-time listening has the double click operation to recorded video interface, if so, monitor default object tracking close event and be triggered.Monitoring after default object tracking close event is triggered, recording frame per second due to current video may be video record frame per second after adjustment, needs current video to be recorded frame per second and is adjusted to normal video record frame per second.Such as, monitoring after default object tracking close event is triggered, it is 45 frames/second that current video records frame per second, current video is recorded frame per second and records frame per second 30 frames/second by being adjusted to normal video 45 frames/second.
Fig. 5 shows the fifth embodiment of the present invention.
Fig. 5 is the structure chart of the video recording device that fifth embodiment of the invention provides.See Fig. 5, described video recording device comprises: translational speed determining unit 510 and frame rate adjustment unit 520.
Wherein, described translational speed determining unit 510, for when recorded video, follows the tracks of the target following object in selected video, determines the translational speed of described target following object based on tracking results;
Described frame rate adjustment unit 520, for the translational speed according to described target following object, adjustment current video records frame per second.
The video recording device that the present embodiment provides, by when recorded video, receive choosing target following object, obtain the translational speed of described target following object, and according to the translational speed of described target following object, adjustment current video records captured number of image frames per second.Achieve and can accurately adjust current video shooting speed when recording fast moving objects, make the video effect of shooting better, improve the experience of user's capture video.
Further, described frame rate adjustment unit 520, comprising: ratio calculation subelement 521 and recording frame per second adjustment subelement 522
Wherein, described ratio calculation subelement 521, for when the translational speed of described target following object is greater than default normal translational speed, calculates the translational speed of described target following object and the ratio of the normal translational speed preset;
Described recording frame per second adjustment subelement 522, for recording frame per second according to described ratio and default normal video, calculating and adjusting current video and recording frame per second.
Further, described frame rate adjustment unit 520, comprising: frame losing process subelement 523.
Wherein, described frame losing process subelement 523, for when the translational speed of described target following object is less than default normal translational speed, the picture frame current recorded video captured carries out frame losing process according to the rule preset.
Further, described device also comprises: event triggers monitoring means 530.
Described event triggers monitoring means 530, is triggered for monitoring default object tracking open event.
Further, described device also comprises: normal frame rate adjustment unit 540.
Described normal frame rate adjustment unit 540, for monitoring after default object tracking close event is triggered, it is that default normal video records frame per second that adjustment current video records frame per second.
Above-mentioned video recording device can perform the video recording method that the embodiment of the present invention provides, and possesses the corresponding functional module of manner of execution and beneficial effect.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Those of ordinary skill in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of computer installation, thus they storages can be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to the combination of any specific hardware and software.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, the same or analogous part between each embodiment mutually see.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, to those skilled in the art, the present invention can have various change and change.All do within spirit of the present invention and principle any amendment, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a video recording method, is characterized in that, described method comprises:
When recorded video, the target following object in selected video is followed the tracks of, determine the translational speed of described target following object based on tracking results;
According to the translational speed of described target following object, adjustment current video records frame per second.
2. method according to claim 1, is characterized in that, according to the translational speed of described target following object, adjustment current video records frame per second, comprising:
When the translational speed of described target following object is greater than default normal translational speed, calculate the translational speed of described target following object and the ratio of the normal translational speed preset;
Record frame per second according to described ratio and default normal video, calculate and adjust current video and record frame per second.
3. method according to claim 1, is characterized in that, according to the translational speed of described target following object, adjustment current video records frame per second, comprising:
When the translational speed of described target following object is less than default normal translational speed, the picture frame current recorded video captured carries out frame losing process according to the rule preset.
4. method according to claim 1, is characterized in that, is following the tracks of, before determining the translational speed of described target following object, comprising based on tracking results the target following object in selected video:
Monitor default object tracking open event to be triggered.
5. method according to claim 4, is characterized in that, in the translational speed according to described target following object, after adjustment current video records frame per second, also comprises:
Monitor after default object tracking close event is triggered, it is that default normal video records frame per second that adjustment current video records frame per second.
6. a video recording device, is characterized in that, described device comprises:
Translational speed determining unit, for when recorded video, follows the tracks of the target following object in selected video, determines the translational speed of described target following object based on tracking results;
Frame rate adjustment unit, for the translational speed according to described target following object, adjustment current video records frame per second.
7. device according to claim 6, is characterized in that, described frame rate adjustment unit, comprising:
Ratio calculation subelement, for when the translational speed of described target following object is greater than default normal translational speed, calculates the translational speed of described target following object and the ratio of the normal translational speed preset;
Record frame per second adjustment subelement, for recording frame per second according to described ratio and default normal video, calculating and adjusting current video and recording frame per second.
8. device according to claim 6, is characterized in that, described frame rate adjustment unit, comprising:
Frame losing process subelement, for when the translational speed of described target following object is less than default normal translational speed, the picture frame current recorded video captured carries out frame losing process according to the rule preset.
9. device according to claim 6, is characterized in that, described device also comprises:
Event triggers monitoring means, is triggered for monitoring default object tracking open event.
10. device according to claim 6, is characterized in that, described device also comprises:
Normal frame rate adjustment unit, for monitoring after default object tracking close event is triggered, it is that default normal video records frame per second that adjustment current video records frame per second.
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