CN101955130A - Tower crane video monitoring system with automatic tracking and zooming functions and monitoring method - Google Patents

Tower crane video monitoring system with automatic tracking and zooming functions and monitoring method Download PDF

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CN101955130A
CN101955130A CN 201010276080 CN201010276080A CN101955130A CN 101955130 A CN101955130 A CN 101955130A CN 201010276080 CN201010276080 CN 201010276080 CN 201010276080 A CN201010276080 A CN 201010276080A CN 101955130 A CN101955130 A CN 101955130A
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CN101955130B (en
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杨静
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Xian University of Technology
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Abstract

The invention discloses a tower crane video monitoring system with automatic tracking and zooming functions, and the invention also discloses a tower crane video monitoring method with automatic tracking and zooming functions. The method comprises the following implementing steps of taking a marker on a crane hook as a tracking target image, and detecting the area and the center of mass of an object at real time by the image processing technology to realize the automatic zooming and tracking, image sequence acquisition, target characteristic extraction, target characteristic match and target search location; and aiming at swaying in the running process of the tower crane, combining a color histogram with form features, and then improving the present mean shift tracking algorithm which is based on the distribution of a target color histogram according to the real operating condition of the tower crane, thereby realizing the target tracking under the environment of the tower crane. The invention has automatic camera zooming and tracking functions so that a tower crane operator can watch the lifted objects and the circumferential situation thereof clearly in a control room at real time .

Description

Tower machine video monitoring system and method for supervising with automatic tracking anamorphosis function
Technical field
The invention belongs to observing and controlling monitoring technique field, relate to a kind of tower machine video monitoring system, the invention still further relates to a kind of tower machine video frequency monitoring method with automatic tracking anamorphosis function with automatic tracking anamorphosis function.
Background technology
Tower crane (hereinafter to be referred as the tower machine) belongs to aerial lift device, operator's compartment is positioned at the tower crane top, in the working process, tower machine operation personnel often do not see surface state, finish needed operation in order to make the tower function, generally need the ground control personnel to cooperate with tower machine operation person, the tower crane operating personal is handled hoisting crane according to commanding's instruction.Under this operating mode, on the one hand,, be easy to take place safety misadventure if the lacking a sense of responsibility of commanding, profile are not enough; On the other hand, the tower crane driver be owing to can't see working environment clearly, operation relatively blindly, spirit is relatively more nervous during work, and is tired easily and cause major accident.Therefore, the visualization problem when solution tower machine operation employee does is the effective ways that improve construction safety.
Existing tower machine video monitoring apparatus, as patent " tower crane visual field monitor unit " (patent No. ZL01239897.7, publication number CN2474505Y, a day 2000.1.30 is disclosed) and patent " tower crane visible monitoring apparatus " (patent No. ZL200520017117.7, publication number CN2813563Y, open day 2006.9.6), alleviated the problem of cooperating between commanding and the tower machine driver to a certain extent, but these automation degree of equipment are lower, in the course of the work, need tower machine operation personnel according to circumstances at any time the camera multiplying power to be carried out hand adjustment, therefore, existing tower machine video monitoring apparatus operability is bad, causes tower machine operation personnel to attend to one thing and lose sight of another maloperation in the operating process easily.
Summary of the invention
The purpose of this invention is to provide a kind of tower machine video monitoring system with automatic tracking anamorphosis function, solved and existed in the prior art, tower machine operation personnel need manually to control at any time the adjustment of camera multiplying power during work, and the operability of system is bad, and work efficiency is lower; Also attend to one thing and lose sight of another easily, cause the problem of maloperation.
Another object of the present invention provides a kind of tower machine video frequency monitoring method with automatic tracking anamorphosis function.
The technical solution adopted in the present invention is, a kind of tower machine video monitoring system with automatic tracking anamorphosis function, the control, demonstration and the recording section that comprise camera part, middle signal transporting part and the rear end of front end, camera part is installed on the amplitude variation trolley of tower machine, the camera lens of camera vertically downward, object is set on suspension hook, is used for the content that camera is monitored is converted into picture signal, and signal is sent on the telltale of control, demonstration and recording section; The signal transporting part is used for camera part is connected with control, demonstration and recording section; It is indoor that control, demonstration and recording section are installed in the tower machine operation, and camera is connected with control, demonstration and recording section by demoder, and the change that is used to control The Cloud Terrace and camera doubly and is handled in real time and shown vision signal.
Another technical scheme of the present invention is, a kind of tower machine video frequency monitoring method with automatic tracking anamorphosis function, earlier camera part is installed on the amplitude variation trolley of tower machine, the camera lens of camera vertically downward, the object of regular shape is set on suspension hook, connect camera part and control by the signal transporting part again, show and recording section, control, it is indoor that demonstration and recording section are installed in the tower machine operation, camera is by demoder and control, show and the recording section connection, adjust camera, make object clearly to be presented in the image, and selected tracking target, in tower machine operational process, change automatic compensation camera multiplying power and The Cloud Terrace angle according to object area and barycenter and realize that camera becomes doubly and tracking automatically, guarantee that object clearly is presented at control all the time, in the display image of demonstration and recording section, concrete implementation step is as follows:
Image M in the window of step 1, initialization tracking target thing will comprise whole object in the image M;
Step 2, extract tracking target image M, and with target image M according to following formula with the color space of pixel from the RGB color space conversion to the hsv color space, obtain tracking target image M ' HSV:
V=max(R,G,B) (1)
S = V - min ( R , G , B ) V V ≠ 0 0 V = 0 - - - ( 2 )
H = ( G - B ) * 60 S V = R 180 - ( B - R ) * 60 S V = G 240 + ( R - G ) * 60 S V = B - - - ( 3 )
When H<0, H=H+360 then
Wherein, H represents tone, and S represents degree of saturation specific humidity, and V represents brightness; R, G, B represent red, green, blue respectively, by formula (1), (2), (3), each pixel among the target image M are transformed into the HSV space from RGB, obtain the HSV model M of tracking target image M ' HSV
The HSV model M of step 3, tracking target image M that step 2 is obtained ' HSVIn value on the H passage of each pixel sample, thereby obtain the color histogram of tracking target image M, with the color histogram model of this color histogram as tracking target image M;
Step 4, initialization current search position of window and size, the current search window will comprise the object of whole tracking target;
The color probability distribution graph of step 5, generation current search window, each pixel of current search window statistic with respective pixel in the color histogram of tracking target image M is replaced, the re-quantization as a result that will obtain then, the scope that is about to the H component quantizes to [0,255], obtain the color probability distribution graph of current search window;
Step 6, utilize the Meanshift iterative algorithm, obtain in the current search window area and the barycenter of institute's tracking target color:
The current search video in window is converted into the color probability distribution graph, finds out the barycenter and the area of this color probability distribution graph by the Meanshift algorithm, concrete steps are as follows:
6.1) calculate the zeroth order square M of current search video in window 00:
M 00 = Σ x Σ y I ( x , y ) - - - ( 5 )
Wherein, (x y) is image mid point (x, the pixel value of y) locating, (x, y) value in the current image window scope to I;
6.2) calculating current search video in window x axle and the axial first moment of y:
M 10 = Σ x Σ y xI ( x , y ) - - - ( 6 )
M 01 = Σ x Σ y yI ( x , y ) - - - ( 7 )
Then the coordinate of barycenter c is: x c = M 10 M 00 , y c = M 01 M 00 - - - ( 8 )
6.3) reset the big or small s of search window:
s = 2 M 00 / 256 - - - ( 9 )
6.4) repeating step 6.1) to step 6.3), obtain next step new search window barycenter c ' (x ' c, y ' c) with the big or small s ' of new search window, in the iterative process, when centroid position changes less than given threshold epsilon, promptly ‖ c '-c ‖≤ε reaches convergence, stops iteration;
In the process of iterative computation, the size of search window constantly changes, to the last the iterative center of mass change in location just reaches convergence less than given threshold value, promptly obtain the area s and the barycenter c of tracking target object image in the current search window, to become doubly and the mobile reference of tracking as camera with this, if iteration result's search window s area increases, then control the camera multiplying power and increase; If search window s area reduces, then reduce the camera multiplying power; Simultaneously, according to the relative change direction of centroid position, adjust the The Cloud Terrace luffing synchronously;
Automatically become in times tracing process at camera, each Meanshift algorithm convergence finishes, and the camera multiplying power will be adjusted 1 times on demand, and the The Cloud Terrace pitch angle is adjusted 1 degree, changes next step then over to, carries out consecutive image and follows the tracks of;
Step 7:Camshift algorithm is to use color histogram as feature to the consecutive image sequence, all frames to the continuous videos image are done the MeanShift computing, and the search box size of utilizing every frame result changes the change of control camera doubly, obtain the next frame new images then, again carry out the MeanShift iteration, so iteration is gone down, up to the size variation of search window less than threshold values ε, thereby realize becoming doubly automatically
Adopt improved Camshift algorithm that tower machine mark is followed the tracks of, improved CamShift algorithm steps is as follows:
7.1) size and the position of initialization search window;
7.2) calculate and search for the interior color probability distribution of window;
7.3) operation Meanshift iterative algorithm, if iteration does not restrain, change step 8 over to; If iteration convergence then obtains the big or small s and the position c of search window, continue next step;
7.4) control multiplying power of camera and The Cloud Terrace motion, if search window area s increases then corresponding increase camera multiplying power, opposite search window area s reduces, then reduce the camera multiplying power, in tracing process, the camera multiplying power is that unit adjusts with each 1 times;
7.5) after camera multiplying power and The Cloud Terrace adjust, the new searching image of a frame will be obtained, and with step 7.3) the big or small s and the new search window of position c initialization of the rope window that obtains, jump to step 7.2 again) go on foot and carry out the Camshift tracing process again, in whole tracing process, thereby iteration realizes in the suspension hook motion process, the tracking of mark;
Step 8, when the iterations of search window or relative distance changes or window size changes and surpasses certain threshold value, then extract the profile of current mobile, carrying out shape judges, judge that the mobile shape weighs mobile again and whether disappear, if moving target is consistent with blip thing shape, then continue to follow the tracks of; If it is inconsistent, then make search window get back to the most initial position of whole track algorithm, it is the camera below, restart the Camshift track algorithm, the object of waiting for set shape occurs, the convergence of Meanshift iterative algorithm then restarts to control the motion of camera multiplying power and The Cloud Terrace, enters the multiplying power adjustment and the tracking of a new round.
The invention has the beneficial effects as follows, tower machine video monitoring has the automatic tracking anamorphosis function, this video monitoring system lens ratio can be according to the surrounding environment automatically regulating, make tower machine operation personnel can see the situation of hanging object and periphery thereof in real time clearly by display equipment at control cabin, thereby carry out correct operation, alleviate tower machine operation personnel's labour intensity, simultaneously, effectively avoid because the grave accident that commander's error causes provides safer building operation environment.
Description of drawings
Fig. 1 is the structural representation of video monitoring system of the present invention;
Fig. 2 is the installation site scheme drawing of video monitoring system of the present invention;
Fig. 3 is existing RGB color model scheme drawing;
Fig. 4 is existing HSI color model scheme drawing;
Fig. 5 is the improved target tracking Camshift algorithm flow chart in the inventive method.
Among the figure, 1. camera part, 2. signal transporting part, 3. control, demonstration and recording section, 4. tracking target, 5. camera, 6. demoder, 7. computing machine, 8. video frequency collection card, 9. transmission medium.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
As Fig. 1, shown in Figure 2, the structure of monitored control system of the present invention is, comprise camera part 1, middle signal transporting part 2 and control, show and recording section 3, camera part 1 is installed on the amplitude variation trolley of tower machine, camera 5 wherein is with the luffing moving of car, and camera lens vertically downward, object 4 (adopting the ball-shaped mark among the present invention) is set on suspension hook, object 4 remains in the monitoring range of camera 5, control, it is indoor that demonstration and recording section 3 are installed in the tower machine operation, camera part 1 and control, connect by the transmission medium in the signal transporting part 2 between demonstration and the recording section 3, tower machine operation personnel are by control, read-out in demonstration and the recording section 3 just can be observed suspended object and surrounding condition thereof always.
Camera part 1 comprises camera 5, these camera 5 additional corresponding protective cover, support and The Cloud Terraces of being provided with, camera 5 is connected with demoder 6, the function of demoder 6 is that the content that camera 5 is monitored is converted into picture signal, and signal is sent on the telltale of control, demonstration and recording section 3.
Signal transporting part 2 is passages of system diagram image signal, control signal, power supply signal, is bearing the transmission work of image data stream, control signal, power supply signal, transmission medium 9 corresponding employing video lines, power lead, control line.
Control, demonstration and recording section 3 are cores of whole monitoring system, mainly comprise two parts function, the one, and the change of control The Cloud Terrace and camera 5 is doubly; The 2nd, finish the real-time Presentation Function of vision signal.Consider that space, tower machine operation chamber is narrow and small, be unsuitable for placing big more article, control, demonstration and recording section 3 have adopted the panel computer with touch function.
Tower machine video monitoring system of the present invention, utilize automatic tracking that image processing techniques finishes zoom camera 5 and become doubly, its principle of work is: the target that the object 4 that is provided with on the suspension hook is followed the tracks of as monitored control system, when the tower machine hoists or descending motion, the area of object 4 can change in the graphicinformation of camera 5, according to these characteristics, system passes through image processing algorithm, calculate the variation of object 4 areas in real time, automatically become foundation doubly as control camera 5, realize automatic tracking, thereby guarantee tower machine operation personnel at work, visual effect is best.Quick and effective for what guarantee to follow the tracks of, in control of the present invention, demonstration and the recording section 3, adopted improved Camshift algorithm, color is combined as tracking target with area; Simultaneously, under special circumstances with the mark shape as tracking target, thereby improve to follow the tracks of efficient;
The inventive method is improved existing C amshift algorithm, the principle of work of the Camshift algorithm after the improvement is: the iconic model of at first determining tracking target object 4, specify first frame search the window's position and the size then, barycenter and area with object 4 in the Meanshift algorithm keeps track search window, if algorithm convergence then utilize result of calculation to adjust the camera multiplying power, and control The Cloud Terrace, simultaneously, utilize new search window position and size in the result of calculation initialization next frame image, and start new round Camshift algorithm; If algorithm is not restrained, then judge by shape facility whether this object is the tracking target shape, if then continue to follow the tracks of, get back to camera 5 belows and wait for that object 4 occurs once more if not then abandoning following the tracks of.
The concrete implementation step of the inventive method is:
At first adjust camera 5, make object 4 clearly to be presented in the image, and selected tracking target, in tower machine operational process, change automatic compensation camera multiplying power and The Cloud Terrace angle according to object 4 areas and barycenter and realize that camera becomes doubly and tracking automatically, guarantee that object 4 clearly is presented in the image all the time, the specific implementation step is as follows:
Image M in the window of step 1, initialization tracking target thing 4 will comprise whole object 4;
Step 2, extract tracking target image M, and with target image M from the RGB color space conversion to the hsv color space, obtain tracking target image M ' HSV
(1) RGB model
The RGB color space is by red (R), and green (G), blue (B) three kinds of colors are formed, and it is the most frequently used a kind of color model of hardware device, is used for the colour display system of vision receiver and computing machine more.By red, green, blue three kinds of mix of basic colors obtain most color.What the RGB color space adopted is Cartesian coordinates, and three axles are respectively R, G, B.Initial point then drops in the color cube of being made up of red-green-blue in the three dimensional space, as shown in Figure 3 corresponding to other color of white from initial point summit farthest corresponding to black, diagonal line arrives (1 from (0,0,0), 1,1) representative is to change to the lime degree from black.
(2) HSV model
HSV model (Hue saturation value) model is a kind of color matching model corresponding to the artist, can better reflect perception and the discriminating of people to color, the three elements (form and aspect, lightness and degree of saturation specific humidity) of the direct corresponding human eye color vision feature in HSV space, three components are independent mutually.As shown in Figure 4, the HSV system of axes adopts is that circular cylindrical coordinate and all definitions of color are in hexagonal pyramid.Tone (Hue) is decided by dominant wavelength in the object reflected light rays, and different wavelength produces different color perceptions.It is not influenced by bright light, the light and shade of color, and its span is 0 to 360; The in bright gay color light degree of degree of saturation specific humidity (Saturation) expression, the ratio of white of promptly mixing in the color of same form and aspect if wherein not having white mixes, is called pure color, and the low more then color of white ratio is distinct more, otherwise, will become light more.Its span is from 0 to 1, obtains the purest color (being not white) when S=1; The GTG degree of brightness (Value) expression color shade is as the power of tone color.Its value also is from 0 to 1, obtains black when getting 0 value.
Though the RGB color space is that the correlativity of three components of RGB is very big in the RGB color space towards the most frequently used a kind of color space of hardware device, that is to say at R, G, when certain component of B changed, other components also can and then change.The variation of Illumination intensity also has bigger influence to the value of RGB component in addition, and this has just brought very big inconvenience to practical application.Comparatively speaking, hsv color space shown in Figure 4 more meets human vision property than RGB color space, and three components of HSV are independently, can consider separately that calculated amount is littler than three components of RGB color space.Therefore with current video image from the RGB color space conversion to the hsv color space.
Transfer algorithm from the GRB color space to the hsv color space has a lot, although they are different on arithmetic speed, complexity, but the H component that obtains at last is similar substantially with the S component image, and the present invention adopts following formula that the color space of pixel is transformed into the HSV space from RGB:
V=max(R,G,B) (1)
S = V - min ( R , G , B ) V V ≠ 0 0 V = 0 - - - ( 2 )
H = ( G - B ) * 60 S V = R 180 - ( B - R ) * 60 S V = G 240 + ( R - G ) * 60 S V = B - - - ( 3 )
When H<0, H=H+360 then
Wherein, H represents tone, and S represents degree of saturation specific humidity, and V represents brightness; R, G, B represent red, green, blue respectively.By formula (1), (2), (3), each pixel among the target image M is transformed into the HSV space from RGB, obtain the HSV model M of tracking target image M ' HSV
The HSV model M of step 3, tracking target image M that step 2 is obtained ' HSVIn value on the H passage of each pixel sample, thereby obtain the color histogram of tracking target image M, this color histogram is preserved the color histogram model that is used as tracking target image M down.
Color histogram has characterized the distribution frequency of color of image, describes the integral color feature of image with color histogram.Suppose that for tracking target image M size is I 1* I 2, each component value is C k(C k=1,2 ..., n), define the statistical value h[C of one group of pixel 1], h[C 2] ..., h[C n] be the color frequency of this image:
Figure BSA00000260907700111
H[C wherein k] be color value C kAppearance frequency in image, and T (M[i, j]) be pixel (i, j) color value in color space.With the color progression in the image is abscissa, and the color frequency of occurrences is the color histogram that the figure of ordinate just is called image.
Need consider the problem of the span of H component at this, the span of H component is [0,360], the value of this span can not be represented with a byte, in order to represent that the present invention does suitable quantification treatment with the H value with a byte, the scope of H component is quantized to [0,255].
Step 4, initialization current search position of window and size, current search window will comprise the object 4 of whole tracking target.
Step 5: the color probability distribution graph that generates the current search window.Use the statistic of respective pixel in the color histogram of tracking target image to replace each pixel of current search window, the re-quantization as a result that will obtain then, the scope that is about to the H component is quantized to [0,255], just obtains the color probability distribution graph of current search window.In order to reduce the expense of time, among the present invention as probability 0 zone with extra-regional other zones of image processing.
Step 6: utilize the Meanshift iterative algorithm, obtain in the current search window area of tracking target color and barycenter.
After the current search video in window is converted into the color probability distribution graph, the Meanshift algorithm will be found out the barycenter and the area of this color probability distribution graph, and calculation procedure is as follows:
(6.1) the zeroth order square M of calculating current search video in window 00:
M 00 = Σ x Σ y I ( x , y ) - - - ( 5 )
Wherein, (x y) is image mid point (x, the pixel value of y) locating, (x, y) value in the current image window scope to I;
(6.2) calculate current search video in window x axle and the axial first moment of y:
M 10 = Σ x Σ y xI ( x , y ) - - - ( 6 )
M 01 = Σ x Σ y yI ( x , y ) - - - ( 7 )
Then the coordinate of barycenter c is:
x c = M 10 M 00 , y c = M 01 M 00 - - - ( 8 )
(6.3) reset the big or small s of search window:
s = 2 M 00 / 256 - - - ( 9 )
(6.4) repeat (6.1) step to (6.3) step, obtain next step new search window barycenter c ' (x ' c, y ' c) with the big or small s ' of new search window, in the iterative process, when centroid position changes less than given threshold epsilon, be ‖ c '-c ‖≤ε, reach convergence, stop iteration, wherein the value of ε depends on the needed precision of engineering, threshold epsilon depends on follows the tracks of desired precision, in tower machine automatic tracking zooming system, gets 5-8 pixel.
In the process of iterative computation, the size of search window constantly changes, to the last the iterative center of mass change in location just reaches convergence less than given threshold value, promptly obtain the area s and the barycenter c of tracking target object image in the current search window, to become doubly and the mobile reference of tracking as camera with this, if iteration result's search window s area increases, then control the camera multiplying power and increase; If search window s area reduces, then reduce the camera multiplying power; Simultaneously, according to the relative change direction of centroid position, adjust the The Cloud Terrace luffing synchronously;
Automatically become in times tracing process at camera, the luffing of adjustment of camera multiplying power and The Cloud Terrace is that unit carries out (precision and rate of following that this step-length value depends on tracking) with step-length mouth c, each Meanshift algorithm convergence finishes, adjust camera multiplying power c and The Cloud Terrace pitch angle, the camera multiplying power will be adjusted 1 times on demand, the The Cloud Terrace pitch angle is adjusted 1 degree, changes next step then over to, carries out consecutive image and follows the tracks of;
Step 7:Camshift algorithm is to use color histogram as feature to the consecutive image sequence, all frames to the continuous videos image are done the MeanShift computing, and the search box size of utilizing every frame result changes the change of control camera doubly, obtain the next frame new images then, again carry out the MeanShift iteration, so iteration is gone down, up to the size variation of search window less than threshold values ε, thereby realize becoming doubly automatically.
Among the present invention, adopt improved Camshift algorithm that tower machine mark is followed the tracks of; Because tower machine building site circumstance complication inevitably has the building site article color situation identical with the characteristics of image color and occurs, therefore, the improvement track algorithm that the present invention adopts shape and Camshift algorithm to combine, improved CamShift algorithm steps is as follows:
(7.1) size of initialization search window and position;
(7.2) calculate the interior color probability distribution of search window;
(7.3) operation Meanshift iterative algorithm if iteration does not restrain, changes step 8 over to; If iteration convergence then obtains the big or small s and the position c of search window, continue next step;
(7.4) multiplying power of control camera 5 and The Cloud Terrace motion, if search window area s increases, the then corresponding camera multiplying power that reduces, opposite search window area s reduces, and then increases the camera multiplying power.In tracing process, the adjustment of camera multiplying power is that unit carries out with 1 times;
(7.5) after camera multiplying power and The Cloud Terrace are adjusted, will obtain the new searching image of a frame, and the big or small s and the new search window of position c initialization of the rope window that obtains with (7.3) step, jumping to for (7.2) step again carries out the Camshift tracing process again.In whole tracing process, thereby iteration realizes in the suspension hook motion process tracking of mark.
Step 8: when the iterations of search window or relative distance changes or window size changes and surpasses certain threshold value, illustrate that Camshift follows the tracks of calculating and goes wrong, then extract the profile of current mobile, carrying out shape judges, judge that the mobile shape weighs mobile again and whether disappear, if moving target consistent with the blip thing (being circular in this algorithm) then continues to follow the tracks of; If it is inconsistent, then allow search window get back to the most initial position of whole track algorithm, be camera 5 belows, restart the Camshift track algorithm, wait for that the circular target mark occurs, the Meanshift iterative algorithm can be restrained, and restarts to control camera multiplying power and The Cloud Terrace motion, enters the multiplying power adjustment and the tracking of a new round.

Claims (5)

1.一种具有自动跟踪变倍功能的塔机视频监控系统,其特征在于:包括前端的摄像部分(1)、中间的信号传输部分(2)以及后端的控制、显示及记录部分(3),摄像部分(1)安装于塔机的变幅小车上,摄像头(5)的镜头垂直向下,在吊钩上设置目标物(4),用于将摄像头(5)所监控的内容转化为图像信号,并把信号传送到控制、显示及记录部分(3)的显示器上;信号传输部分(2),用于将摄像部分(1)与控制、显示及记录部分(3)连接;控制、显示及记录部分(3)安装在塔机操作室内,摄像头(5)通过解码器(6)与控制、显示及记录部分(3)连接,用于控制云台及摄像头(5)的变倍,以及对视频信号实时处理及显示。1. A tower crane video monitoring system with automatic tracking zoom function, characterized in that it includes a front-end camera part (1), a middle signal transmission part (2) and a back-end control, display and recording part (3) , the camera part (1) is installed on the luffing trolley of the tower crane, the lens of the camera (5) is vertically downward, and the target (4) is set on the hook, which is used to convert the monitored content of the camera (5) into image signal, and transmit the signal to the display of the control, display and recording part (3); the signal transmission part (2) is used to connect the camera part (1) with the control, display and recording part (3); control, display and recording part (3) The display and recording part (3) is installed in the operating room of the tower crane, and the camera (5) is connected with the control, display and recording part (3) through the decoder (6), and is used to control the zoom of the pan/tilt and the camera (5), And real-time processing and display of video signals. 2.根据权利要求1所述的具有自动跟踪变倍功能的塔机视频监控系统,其特征在于:所述的摄像头(5)配置有防护罩、支架和云台。2. The tower crane video monitoring system with automatic tracking and zooming function according to claim 1, characterized in that: the camera (5) is equipped with a protective cover, a bracket and a cloud platform. 3.一种具有自动跟踪变倍功能的塔机视频监控方法,其特征在于,先将摄像部分(1)安装于塔机的变幅小车上,摄像头(5)的镜头垂直向下,在吊钩上设置形状规则的目标物(4),再通过信号传输部分(2)连接摄像部分(1)和控制、显示及记录部分(3),控制、显示及记录部分(3)安装在塔机操作室内,摄像头(5)通过解码器(6)与控制、显示及记录部分(3)连接,调整摄像头(5),使得目标物(4)能够清晰地显示在图像中,并选定跟踪目标,在塔机运行过程中,根据目标物(4)面积及质心变化自动调整摄像头倍率以及云台角度实现摄像头自动变倍与跟踪,保证目标物(4)始终清晰地显示在控制、显示及记录部分(3)的显示器图像中,具体实施步骤如下:3. A video surveillance method for tower cranes with automatic tracking zoom function, characterized in that, the camera part (1) is installed on the luffing trolley of the tower crane earlier, the lens of the camera (5) is vertically downward, A regular-shaped target (4) is set on the hook, and then the camera part (1) and the control, display and record part (3) are connected through the signal transmission part (2). The control, display and record part (3) is installed on the tower crane In the operating room, the camera (5) is connected to the control, display and recording part (3) through the decoder (6), and the camera (5) is adjusted so that the target (4) can be clearly displayed in the image, and the tracking target is selected , during the operation of the tower crane, the camera magnification and the angle of the pan/tilt are automatically adjusted according to the change of the area and center of mass of the target (4) to realize automatic zooming and tracking of the camera, ensuring that the target (4) is always clearly displayed in the control, display and recording In the display image of part (3), the specific implementation steps are as follows: 步骤1、初始化跟踪目标物(4)的窗口中的图像M,图像M中要包含整个目标物(4);Step 1, initialize the image M in the window of the tracking target (4), the entire target (4) will be included in the image M; 步骤2、提取跟踪目标图像M,并将目标图像M按照以下公式将像素点的颜色空间从RGB颜色空间转换到HSV颜色空间,得到跟踪目标图像M′HSVStep 2, extract the tracking target image M, and convert the color space of the pixel points from the RGB color space to the HSV color space according to the target image M according to the following formula, and obtain the tracking target image M′ HSV : V=max(R,G,B)                        (1)V=max(R,G,B)          (1) SS == VV -- minmin (( RR ,, GG ,, BB )) VV VV &NotEqual;&NotEqual; 00 00 VV == 00 -- -- -- (( 22 )) Hh == (( GG -- BB )) ** 6060 SS VV == RR 180180 -- (( BB -- RR )) ** 6060 SS VV == GG 240240 ++ (( RR -- GG )) ** 6060 SS VV == BB -- -- -- (( 33 )) 当H<0时,则H=H+360When H<0, then H=H+360 其中,H表示色调,S表示饱和度,V表示亮度;R,G,B分别表示红、绿、蓝,通过公式(1)、(2)、(3),将目标图像M中每个像素点从RGB转换到HSV空间,得到跟踪目标图像M的HSV模型M′HSVAmong them, H represents hue, S represents saturation, V represents brightness; R, G, and B represent red, green, and blue respectively. Through formulas (1), (2), and (3), each pixel in the target image M Point is transformed into HSV space from RGB, obtains the HSV model M′ HSV of tracking target image M; 步骤3、对步骤2得到的跟踪目标图像M的HSV模型M′HSV中每个像素的H通道上的值进行采样,从而得到跟踪目标图像M的颜色直方图,将该颜色直方图作为跟踪目标图像M的颜色直方图模型;Step 3, sampling the value on the H channel of each pixel in the HSV model M′ HSV of the tracking target image M obtained in step 2, so as to obtain the color histogram of the tracking target image M, and use the color histogram as the tracking target The color histogram model of the image M; 步骤4、初始化当前搜索窗口的位置和大小,当前搜索窗口要包含整个跟踪目标的目标物(4);Step 4, initialize the position and size of the current search window, the current search window will include the target object (4) of the entire tracking target; 步骤5、生成当前搜索窗口的颜色概率分布图,将当前搜索窗口的每一个像素用跟踪目标图像M的颜色直方图中相应像素的统计量代替,然后将得到的结果重新量化,即将H分量的范围量化到[0,255],得到当前搜索窗口的颜色概率分布图;Step 5. Generate the color probability distribution map of the current search window, replace each pixel of the current search window with the statistics of the corresponding pixels in the color histogram of the tracking target image M, and then requantize the obtained results, that is, the H component Quantize the range to [0, 255] to get the color probability distribution map of the current search window; 步骤6、利用Meanshift迭代算法,得到当前搜索窗口中,所跟踪目标颜色的面积及质心:Step 6. Use the Meanshift iterative algorithm to obtain the area and centroid of the tracked target color in the current search window: 将当前搜索窗口图像转化为颜色概率分布图,通过Meanshift算法找出该颜色概率分布图的质心及面积,具体步骤如下:Convert the current search window image into a color probability distribution map, and use the Meanshift algorithm to find the centroid and area of the color probability distribution map. The specific steps are as follows: 6.1)计算当前搜索窗口图像的零阶矩M006.1) Calculate the zero-order moment M 00 of the current search window image: Mm 0000 == &Sigma;&Sigma; xx &Sigma;&Sigma; ythe y II (( xx ,, ythe y )) -- -- -- (( 55 )) 其中,I(x,y)为图像中点(x,y)处的像素值,(x,y)在当前图像窗口范围内取值;Wherein, I (x, y) is the pixel value at the point (x, y) in the image, and (x, y) takes a value within the current image window range; 6.2)计算当前搜索窗口图像x轴和y轴方向的一阶矩:6.2) Calculate the first-order moments of the x-axis and y-axis directions of the current search window image: Mm 1010 == &Sigma;&Sigma; xx &Sigma;&Sigma; ythe y xIxI (( xx ,, ythe y )) -- -- -- (( 66 )) Mm 0101 == &Sigma;&Sigma; xx &Sigma;&Sigma; ythe y yIi (( xx ,, ythe y )) -- -- -- (( 77 )) 则质心c的坐标为: x c = M 10 M 00 , y c = M 01 M 00 - - - ( 8 ) Then the coordinates of the centroid c are: x c = m 10 m 00 , the y c = m 01 m 00 - - - ( 8 ) 6.3)重新设定搜索窗口的大小s:6.3) Reset the size s of the search window: sthe s == 22 Mm 0000 // 256256 -- -- -- (( 99 )) 6.4)重复步骤6.1)至步骤6.3),得到下一步新搜索窗口的质心c′(x′c,y′c)与新搜索窗口的大小s′,迭代过程中,当质心位置变化小于给定的阈值ε,即‖c′-c‖≤ε,达到收敛,停止迭代;6.4) Repeat steps 6.1) to 6.3) to obtain the centroid c'(x' c , y' c ) of the new search window in the next step and the size s' of the new search window. During the iteration process, when the centroid position changes less than the given The threshold ε of , that is, ‖c′-c‖≤ε, reaches convergence and stops iteration; 迭代计算的过程中,搜索窗口的尺寸不断的变化,直到最后迭代质心位置变化小于给定的阈值就达到收敛,即得到当前搜索窗口中跟踪目标物图像的面积s及质心c,将以此作为摄像头变倍以及跟踪移动的参考,如果迭代结果的搜索窗口s面积增大,则控制摄像头倍率增大;如果搜索窗口s面积减小,则减小摄像头倍率;同时,根据质心位置相对变化方向,同步调整云台俯仰运动;In the process of iterative calculation, the size of the search window is constantly changing until the change of the position of the center of mass in the final iteration is less than a given threshold to achieve convergence, that is, the area s and the center of mass c of the tracking target image in the current search window are obtained, which will be used as Reference for camera zooming and tracking movement. If the area of the search window s of the iteration result increases, the magnification of the camera is controlled to increase; if the area of the search window s decreases, the magnification of the camera is reduced; at the same time, according to the relative change direction of the centroid position, Synchronously adjust the pitching motion of the gimbal; 在摄像头自动变倍跟踪过程中,每次Meanshift算法收敛结束,摄像头倍率将按需要调整1倍,云台俯仰角调整1度,然后转入下一步,进行连续图像跟踪;In the process of automatic zoom tracking of the camera, each time the Meanshift algorithm converges, the camera magnification will be adjusted by 1 times as required, and the pitch angle of the gimbal will be adjusted by 1 degree, and then go to the next step for continuous image tracking; 步骤7:Camshift算法是对连续图像序列使用颜色直方图作为特征,对连续视频图像的所有帧作MeanShift运算,并利用每帧结果的搜索窗口大小变化控制摄像头变倍,然后得到下一帧新图像,重新进行MeanShift迭代,如此迭代下去,直到搜索窗口的大小变化小于阀值ε,从而实现自动变倍,Step 7: The Camshift algorithm is to use the color histogram as a feature for the continuous image sequence, perform the MeanShift operation on all the frames of the continuous video image, and use the search window size change of each frame result to control the zoom of the camera, and then get the next new frame image , re-do the MeanShift iteration, and so on, until the size change of the search window is less than the threshold ε, so as to realize automatic zooming, 采用改进的Camshift算法对塔机标志物进行跟踪,改进的CamShift算法步骤如下:The improved Camshift algorithm is used to track the landmarks of the tower crane. The steps of the improved CamShift algorithm are as follows: 7.1)初始化搜索窗口的大小和位置;7.1) Initialize the size and position of the search window; 7.2)计算搜索窗内的颜色概率分布;7.2) Calculate the color probability distribution in the search window; 7.3)运行Meanshift迭代算法,如果迭代不收敛,转入步骤8;如果迭代收敛,则得到搜索窗口的大小s和位置c,继续下一步;7.3) Run the Meanshift iterative algorithm, if the iteration does not converge, go to step 8; if the iteration converges, then get the size s and position c of the search window, and continue to the next step; 7.4)控制摄像头(5)的倍率以及云台运动,如果搜索窗口面积s增大,则相应增大摄像头倍率,相反搜索窗口面积s减小,则减小摄像头倍率,在跟踪过程中,摄像头倍率以每次1倍为单位进行调整;7.4) Control the magnification of the camera (5) and the movement of the gimbal. If the search window area s increases, the camera magnification will be increased accordingly. On the contrary, the search window area s will decrease, and the camera magnification will be reduced. During the tracking process, the camera magnification Adjust by 1 times each time; 7.5)摄像头倍率以及云台调整后,将得到一帧新的搜索图像,并以步骤7.3)得到的索窗口的大小s和位置c初始化新的搜索窗口,再跳转到步骤7.2)步重新进行Camshift跟踪过程,在整个跟踪过程中,迭代从而实现吊钩运动过程中,标志物的跟踪;7.5) After the camera magnification and the gimbal are adjusted, a new frame of search image will be obtained, and a new search window will be initialized with the size s and position c of the cable window obtained in step 7.3), and then jump to step 7.2) and proceed again The Camshift tracking process, in the whole tracking process, iterates to realize the tracking of the markers during the movement of the hook; 步骤8、当搜索窗口的迭代次数或相对距离变化或窗口大小变化超过一定的阈值,则提取当前运动物体的轮廓,进行形状判断,判断运动物体形状重新衡量运动物体是否消失,如果运动目标与目标标志物形状一致,则继续跟踪;如果不一致,则使搜索窗口回到整个跟踪算法的最初始位置,即摄像头(5)下方,重新启动Camshift跟踪算法,等待所设形状的目标物(4)出现,Meanshift迭代算法收敛,则重新开始控制摄像头倍率以及云台运动,进入新一轮的倍率调整以及跟踪。Step 8. When the number of iterations of the search window or the relative distance change or the window size change exceeds a certain threshold, extract the outline of the current moving object, perform shape judgment, and judge the shape of the moving object to re-evaluate whether the moving object disappears. If the shapes of the markers are consistent, continue tracking; if not, return the search window to the initial position of the entire tracking algorithm, that is, under the camera (5), restart the Camshift tracking algorithm, and wait for the target object (4) of the set shape to appear , the Meanshift iterative algorithm converges, and the camera magnification and gimbal movement will be controlled again, entering a new round of magnification adjustment and tracking. 4.根据权利要求3所述的具有自动跟踪变倍功能的塔机视频监控方法,其特征在于,在步骤6.4)中,阈值ε取决于跟踪所要求的精度,在塔机自动跟踪变倍系统中,取5-8个像素。4. the tower crane video monitoring method with automatic tracking variable magnification function according to claim 3, is characterized in that, in step 6.4), threshold ε depends on the precision required for tracking, in tower crane automatic tracking variable magnification system , take 5-8 pixels. 5.根据权利要求3所述的具有自动跟踪变倍功能的塔机视频监控方法,其特征在于,在步骤8中,当搜索窗口的迭代次数或相对距离变化或窗口大小变化超过一定的阈值,即取迭代次数20次,窗口距离变化大于200个像素,窗口大小变化超过50%。5. the tower crane video monitoring method with automatic tracking variable magnification function according to claim 3, is characterized in that, in step 8, when the number of iterations of search window or relative distance change or window size change exceed certain threshold value, That is, the number of iterations is 20, the window distance changes by more than 200 pixels, and the window size changes by more than 50%.
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