CN104883524B - Moving target automatic tracking image pickup method and system in a kind of Online class - Google Patents
Moving target automatic tracking image pickup method and system in a kind of Online class Download PDFInfo
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- CN104883524B CN104883524B CN201510293023.0A CN201510293023A CN104883524B CN 104883524 B CN104883524 B CN 104883524B CN 201510293023 A CN201510293023 A CN 201510293023A CN 104883524 B CN104883524 B CN 104883524B
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Abstract
Moving target automatic tracking image pickup method and system in a kind of Online class of present invention offer, the above method include the following steps：Picture pick-up device acquires current frame image, and detects the Moving Objects in the current frame image；It identifies the classification belonging to the Moving Objects and obtains the shooting distance of the Moving Objects；According to Moving Objects classification, the shooting distance, the shooting adjustment parameter table of comparisons corresponding with Moving Objects classification, determines corresponding shooting adjustment parameter and track up is carried out according to the shooting adjustment parameter.The present invention also provides moving target automatic tracking camera system in a kind of Online class, above system includes：Picture pick-up device；The picture pick-up device includes Moving Objects collecting unit, acquiring unit, acquisition parameters adjustment unit and track up unit；The Moving Objects collecting unit passes sequentially through the acquiring unit, the acquisition parameters adjustment unit is connected with the track up unit.
Description
Technical field
The invention belongs to moving target automatic tracking image pickup methods in network communication field more particularly to a kind of Online class
And system.
Background technology
In the actual application in Online class and straight recorded broadcast classroom, in order to realize the real-time tracking to Faculty and Students
And detection, it is thus necessary to determine that the PTZ values of video camera, wherein P represents moving left and right for holder, and T represents moving up and down for holder, Z generations
Watch mirror head zoom, Zoom control.
Method generally used now is that classroom is divided into multiple regions in advance by way of setting presetting bit, for
Each region pre-sets corresponding PTZ values, is then corresponded to the camera allocation region according to moving object region
PTZ values.But in the method, since presetting bit is a bigger zone of action, target is at the center of a presetting bit
When with edge movable, the PTZ values of video camera are the same, and necessarily tracking accuracy are caused to decline in this way, shooting picture is unintelligible.
When classroom being divided into advance more regions, complexity is higher, and still cannot in real time be calculated according to the movement of moving object
Out.
Invention content
Moving target automatic tracking image pickup method and system in a kind of Online class of present invention offer, to solve above-mentioned ask
Topic.
Moving target automatic tracking image pickup method in a kind of Online class of present invention offer.The above method includes following step
Suddenly：Picture pick-up device acquires current frame image, and detects the Moving Objects in the current frame image；Identify the movement pair
As affiliated classification and obtain the shooting distances of the Moving Objects；According to Moving Objects classification, the shooting distance and movement
The corresponding shooting adjustment parameter table of comparisons of object type, determine corresponding shooting adjustment parameter and according to the shooting adjustment parameter into
Line trace is shot.
The present invention also provides moving target automatic tracking camera system in a kind of Online class, above system includes：Camera shooting
Equipment；The picture pick-up device includes Moving Objects collecting unit, acquiring unit, acquisition parameters adjustment unit and track up list
Member；The Moving Objects collecting unit passes sequentially through the acquiring unit, the acquisition parameters adjustment unit and the tracking and claps
Unit is taken the photograph to be connected；The Moving Objects collecting unit for acquiring current frame image, and detects in the current frame image
Moving Objects；The Moving Objects information that the Moving Objects collecting unit is additionally operable to detect is sent to the acquiring unit；
The acquiring unit goes out the classification belonging to the Moving Objects and obtains the shooting distance of the Moving Objects for identification；Institute
Acquiring unit is stated, is additionally operable to store the corresponding shooting adjustment parameter table of comparisons of Moving Objects of all categories, and the information that will be got
It is sent to the acquisition parameters adjustment unit；The acquisition parameters adjustment unit, for according to Moving Objects classification, the shooting
Distance, the shooting adjustment parameter table of comparisons corresponding with Moving Objects classification determine corresponding shooting adjustment parameter, and are shot corresponding
Adjustment parameter is sent to the track up unit；The track up unit, for being carried out according to the shooting adjustment parameter
Track up.
Compared to prior art, according to moving target automatic tracking image pickup method in a kind of Online class provided by the invention
And system, the present invention is according to Moving Objects classification, the shooting distance, shooting adjustment parameter pair corresponding with Moving Objects classification
According to table, determines corresponding shooting adjustment parameter and track up is carried out according to the shooting adjustment parameter.It does not need in the present invention
Shooting adjustment parameter is pre-set, but according to the position of real-time calculated Moving Objects, it is right in real time to be carried out to picture pick-up device
It is burnt.The present invention can realize the function of picture pick-up device automatic focusing in real time, avoid the caused picture mould of tracking camera rotation
The problems such as paste.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 show moving target automatic tracking shooting side in the Online class that preferred embodiment according to the present invention provides
The flow chart of method；
Fig. 2 show the acquisition picture pick-up device that preferred embodiment according to the present invention provides to the Moving Objects
The method schematic diagram of air line distance between top apex；
Fig. 3 show moving target automatic tracking shooting system in the Online class that preferred embodiment according to the present invention provides
The structural schematic diagram of system.
Specific implementation mode
Come that the present invention will be described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
It is that moving target automatic tracking is shot in the Online class provided according to presently preferred embodiments of the present invention as shown in Figure 1
The flow chart of method.As shown in Figure 1, moving target automatic tracking is shot in the Online class that presently preferred embodiments of the present invention provides
Method includes step 101-103.
Step 101：Picture pick-up device acquires current frame image, and detects the Moving Objects in the current frame image；
Detect that the process of the Moving Objects in the current frame image is：Obtain current frame image in object relative to
The displacement of the object in previous frame image, if the displacement is more than preset value, it is determined that the object is Moving Objects.
Step 102：It identifies the classification belonging to the Moving Objects and obtains the shooting distance of the Moving Objects；
The Moving Objects include teacher, student.
By recognition of face, the classification belonging to the Moving Objects is identified.
The shooting distance is the picture pick-up device to the air line distance between the top apex of the Moving Objects.
According to the height of the angle of the mounting height of the picture pick-up device, picture pick-up device and metope, the Moving Objects, obtain
Take the shooting distance.
The shooting distance is L, L=L2-L1；
Wherein, L1=h/cos θ, L2=H/cos θ；
Make straight line with the top apex B of the intersection point A of the picture pick-up device and metope and the Moving Objects, is somebody's turn to do
The intersection point C of straight line and ground, wherein L1 is the length of BC line segments, and L2 is the length of AC line segments；
Wherein, θ is the angle of the picture pick-up device and metope, and H is the mounting height of the picture pick-up device, and h is the fortune
The height of dynamic object.
Step 103：Ginseng is adjusted according to Moving Objects classification, the shooting distance, shooting corresponding with Moving Objects classification
The number table of comparisons determines corresponding shooting adjustment parameter and carries out track up according to the shooting adjustment parameter.
Citing is described in detail below：
Assuming that in Online class, video camera is arranged close to 2.5 meters from the ground of height on the wall at dais, is being started
Before class face's sample image of Faculty and Students is stored, unlatching video camera, camera acquisition current frame image a, and
The Moving Objects in current frame image are detected by frame differential method in conjunction with previous frame the image collected b.
Wherein, detect that the Moving Objects in current frame image a further include：Background subtraction method and optical flow method.
In addition, in order to improve treatment effeciency, it, will by the way that the displacement of the object in image a to be compared with preset value
The object that micro-displacement variation occurs in image a is not intended as Moving Objects, is reduced in this way because human body shakes or wind is brought
The misjudgment phenomenon of Moving Objects, to reduce rubbish camera lens.
Such as：The displacement of current goal object z is less than 5 centimetres (assuming that preset value is 5 centimetres), then will be in current frame image
Object z be judged as Moving Objects, continue to detect, until find object displacement be more than 5 centimetres, then be judged as transporting
Dynamic object.
Assuming that the Moving Objects detected in image a are y, the face image of Moving Objects y is passed through into recognition of face
For method compared with the teacher face sample image being previously stored, it is teacher to obtain Moving Objects y, calculates the shooting distance of teacher, is had
It is straight to obtain this as shown in Fig. 2, the top apex B with the intersection point A of video camera and metope and the Moving Objects makees straight line for body
The intersection point C of line and ground.Assuming that the mounting height of picture pick-up device is 2.5 meters, the height of Moving Objects y is 1.7 meters, video camera with
The angle theta of metope is 60 °, and the shooting distance of teacher is the length (i.e. L) of Fig. 2 middle conductors AB, L=H/cos θ-h/cos θ=
2.5/0.5-1.7/0.5=1.6 rice.
The shooting distance of teacher is 1.6 meters from the above results, according to the first shooting adjustment parameter table of comparisons (i.e. table
1), it is known that shooting adjustment parameter is 1 times of zoom, continues track up after the focal length of video camera is become 1 times.
Table 1
Table 2
Wherein, 2 times of zoom shots refer to being shot after 10 meters of remote Moving Objects are zoomed in 5 meters, 4 times of zoom shots
Refer to being shot after 10 meters of remote Moving Objects are zoomed in 2.5 meters.
In an additional preferred embodiment, it is assumed that the Moving Objects detected by recognition of face are student, pass through calculating
The shooting distance of student is obtained, and corresponding shooting adjustment parameter is obtained simultaneously according to the second shooting adjustment parameter table of comparisons (i.e. table 2)
Track up is carried out according to the shooting adjustment parameter.
Fig. 3 show moving target automatic tracking shooting system in the Online class that preferred embodiment according to the present invention provides
System, as shown in figure 3, moving target automatic tracking camera system in the Online class that presently preferred embodiments of the present invention provides, above-mentioned
System includes：Picture pick-up device 300；The picture pick-up device includes Moving Objects collecting unit 301, acquiring unit 302, shooting ginseng
Number adjustment unit 303 and track up unit 304；The Moving Objects collecting unit 301 passes sequentially through the acquiring unit
302, the acquisition parameters adjustment unit 303 is connected with the track up unit 304；The Moving Objects collecting unit 301,
For acquiring current frame image, and detect the Moving Objects in the current frame image；The Moving Objects collecting unit 301
The Moving Objects information for being additionally operable to detect is sent to the acquiring unit 302；The acquiring unit 302, goes out for identification
Classification belonging to the Moving Objects and the shooting distance for obtaining the Moving Objects；The acquiring unit 302 is additionally operable to store
The corresponding shooting adjustment parameter table of comparisons of Moving Objects of all categories, and the information got is sent to the acquisition parameters and is adjusted
Unit 303；The acquisition parameters adjustment unit 303, for according to Moving Objects classification, the shooting distance and Moving Objects
The corresponding shooting adjustment parameter table of comparisons of classification determines corresponding shooting adjustment parameter, and corresponding shooting adjustment parameter is sent to
The track up unit 304；The track up unit 304, for carrying out track up according to the shooting adjustment parameter.
In addition, the specific operation process about above system is with described in the above method, therefore repeated no more in this.
In conclusion compared to prior art, according to moving target in a kind of Online class provided by the invention automatically with
Track image pickup method and system, the present invention is according to Moving Objects classification, the shooting distance, shooting corresponding with Moving Objects classification
The adjustment parameter table of comparisons determines corresponding shooting adjustment parameter and carries out track up according to the shooting adjustment parameter.In this hair
Shooting adjustment parameter need not be pre-set in bright, but according to the position of real-time calculated Moving Objects, to picture pick-up device
It is focused in real time.The present invention can realize the function of picture pick-up device automatic focusing in real time, avoid tracking camera rotation and drawn
The problems such as fuzzy pictures risen.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. moving target automatic tracking image pickup method in a kind of Online class, which is characterized in that include the following steps：
Picture pick-up device acquires current frame image, and detects the Moving Objects in the current frame image；
It identifies the classification belonging to the Moving Objects and obtains the shooting distance of the Moving Objects；
According to Moving Objects classification, the shooting distance, the shooting adjustment parameter table of comparisons corresponding with Moving Objects classification, determine
Corresponding shooting adjustment parameter simultaneously carries out track up according to the shooting adjustment parameter；
The shooting distance be the picture pick-up device to the air line distance between the top apex of the Moving Objects, according to described
The height of the mounting height of picture pick-up device, the angle of picture pick-up device and metope, the Moving Objects, obtains the shooting distance；
The shooting distance is L,
L=L2-L1；
Wherein, L1=h/cos θ, L2=H/cos θ；
Make straight line with the top apex B of the intersection point A of the picture pick-up device and metope and the Moving Objects, obtains the straight line
With the intersection point C on ground, wherein L1 is the length of BC line segments, and L2 is the length of AC line segments；
Wherein, θ is the angle of the picture pick-up device and metope, and H is the mounting height of the picture pick-up device, and h is the movement pair
The height of elephant.
2. according to the method described in claim 1, it is characterized in that, the Moving Objects include teacher, student.
3. according to the method described in claim 1, it is characterized in that, by recognition of face, identify belonging to the Moving Objects
Classification.
4. according to the method described in claim 1, it is characterized in that, detecting the mistake of the Moving Objects in the current frame image
Cheng Wei：Displacement of the object in current frame image relative to the object in previous frame image is obtained, if the displacement is more than
Preset value, it is determined that the object is Moving Objects.
5. moving target automatic tracking camera system in a kind of Online class, which is characterized in that above system includes：Camera shooting is set
It is standby；The picture pick-up device includes Moving Objects collecting unit, acquiring unit, acquisition parameters adjustment unit and track up list
Member；The Moving Objects collecting unit passes sequentially through the acquiring unit, the acquisition parameters adjustment unit and the tracking and claps
Unit is taken the photograph to be connected；
The Moving Objects collecting unit for acquiring current frame image, and detects the movement pair in the current frame image
As；The Moving Objects information that the Moving Objects collecting unit is additionally operable to detect is sent to the acquiring unit；
The acquiring unit, go out the classification belonging to the Moving Objects for identification and obtain the shootings of the Moving Objects away from
From；The acquiring unit, be additionally operable to store the corresponding shooting adjustment parameter table of comparisons of Moving Objects of all categories, and will get
Information is sent to the acquisition parameters adjustment unit；
The acquisition parameters adjustment unit, for according to the Moving Objects classification, shooting distance, corresponding with Moving Objects classification
The shooting adjustment parameter table of comparisons, determine corresponding shooting adjustment parameter, and corresponding shooting adjustment parameter is sent to the tracking
Shooting unit；
The track up unit, for carrying out track up according to the shooting adjustment parameter；
Wherein, the shooting distance is the picture pick-up device to the air line distance between the top apex of the Moving Objects, root
According to the height of the angle of the mounting height of the picture pick-up device, picture pick-up device and metope, the Moving Objects, the shooting is obtained
Distance；
The shooting distance is L,
L=L2-L1；
Wherein, L1=h/cos θ, L2=H/cos θ；
Make straight line with the top apex B of the intersection point A of the picture pick-up device and metope and the Moving Objects, obtains the straight line
With the intersection point C on ground, wherein L1 is the length of BC line segments, and L2 is the length of AC line segments；
Wherein, θ is the angle of the picture pick-up device and metope, and H is the mounting height of the picture pick-up device, and h is the movement pair
The height of elephant.
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| CN105469513A (en) * | 2015-12-31 | 2016-04-06 | 天津中邦信息技术有限公司 | Self-service all-in-one machine based on face detection and character recognition and using method thereof |
| CN107846549A (en) * | 2016-09-21 | 2018-03-27 | 杭州海康威视数字技术股份有限公司 | A kind of method for tracking target, apparatus and system |
| CN107749948A (en) * | 2017-10-16 | 2018-03-02 | 深圳市杜莎科技有限公司 | The intelligence control system and method for a kind of camera |
| CN109815844A (en) * | 2018-12-29 | 2019-05-28 | 西安天和防务技术股份有限公司 | Object detection method and device, electronic equipment and storage medium |
| CN110838132B (en) * | 2019-11-15 | 2022-08-05 | 北京字节跳动网络技术有限公司 | Object segmentation method, device and equipment based on video stream and storage medium |
| CN111324131B (en) * | 2020-03-31 | 2023-09-01 | 中通服创立信息科技有限责任公司 | Tracking monitoring method of track type inspection robot based on human body radar |
| CN112019759A (en) * | 2020-10-26 | 2020-12-01 | 深圳点猫科技有限公司 | Method, device and equipment for tracking and shooting students in recorded and broadcast classes |
| CN113674312A (en) * | 2021-06-30 | 2021-11-19 | 浙江大华技术股份有限公司 | Target tracking close-up method and device |
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