CN106210643A - A kind of video camera viewing area call method - Google Patents
A kind of video camera viewing area call method Download PDFInfo
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- CN106210643A CN106210643A CN201610605261.5A CN201610605261A CN106210643A CN 106210643 A CN106210643 A CN 106210643A CN 201610605261 A CN201610605261 A CN 201610605261A CN 106210643 A CN106210643 A CN 106210643A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
- H04N7/185—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source from a mobile camera, e.g. for remote control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/617—Upgrading or updating of programs or applications for camera control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/64—Computer-aided capture of images, e.g. transfer from script file into camera, check of taken image quality, advice or proposal for image composition or decision on when to take image
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- Closed-Circuit Television Systems (AREA)
Abstract
One video camera viewing area of the present invention call method, including step in detail below: analyze regarding video camera open country, viewing area is analyzed, it is achieved algorithm and video camera link with GIS-Geographic Information System.By above-mentioned, the video camera viewing area call method of the present invention, synchronize the visual field and viewing area, and allow element close to the need as far as possible in the visual field, can point to remote control camera in effective monitoring region specifies position be monitored and transfer picture, deflects into the appointment position time from calling video camera, and efficiency was obviously improved more in the past, required monitoring content is transferred, it is ensured that accuracy and real-time in the very first time.
Description
Technical field
The present invention relates to the field of traffic technique, particularly relate to a kind of video camera viewing area call method.
Background technology
Manipulation for the video camera of monitoring system at present only rests on simple upper and lower, left and right, zoom etc. mostly
Single command operating.Due to systematic limitation, and manually proficiency and the impact of the sensitivity of equipment own, this manipulation
The accuracy of pattern and real-time all can be tended not to transfer in required monitoring in the very first time by bigger interference
Hold.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of video camera viewing area call method, synchronize the visual field with can
Viewed area, and allow element close to the need as far as possible in the visual field, can point to remote control camera in effective monitoring region and specify position
Being monitored and transfer picture, deflecting into the appointment position time from calling video camera, efficiency was obviously improved more in the past, the
One time transferred required monitoring content, it is ensured that accuracy and real-time.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of video camera visible area
Territory call method, including step in detail below:
Step 1: analyze regarding video camera open country, synchronizes the visual field and viewing area；
Step 1.1: synchronize to show camera's range in real time, in GIS-Geographic Information System, display video camera is in current location
With the supervision scope under zoom, and supervision scope is allowed to follow the change of video camera and to change in real time；
Step 1.2: video camera maximum monitors that scope is estimated, calculates every video camera viewing area under each zoom and people
Supervision scope easy to identify, for selecting suitable camera supervised specified point position to prepare；
Step 1.3: the building sheltering analysis to the visual field, based on the visual field selected determine in the case of, carry out further blocking point
Analysis, and in GIS-Geographic Information System, drawing the road not being blocked；
Step 1.4: visual field covering path regional analysis, according to actual needs, for monitor coverage area in GIS-Geographic Information System
The delimitation key area, every section in territory；
Step 2: viewing area is analyzed, and sets up the model of video camera, and video camera viewing area in GIS-Geographic Information System can be waited
Valency is in video camera target surface projection coordinate's tie region in two-dimensional map plane；
Step 2.1: the viewing area of video camera under resting state, according to video camera physical message, by being calculated video camera
Target surface and shot boundary, so calculate camera coverage be projected in ground region；
Step 2.2: the viewing area change of Parameters variation video camera, photographic head deflection and zoom operate, and all can make visual
Region changes, and due to the geographical location information of video camera, the existence of original state error makes calculating have deviation, therefore needs
Analyze the impact on model of each factor；
Step 3: realize algorithm, at Visual field analysis, the GIS-Geographic Information System that viewing area is analyzed links with video camera, and video camera refers to
Realize by corresponding mathematical algorithm to the actual application specifying position；
Step 3.1: viewing area apex coordinate calculates, calculates including target position and floor projection calculates
Step 3.2: Systematic Errors correction, is moved by mathematical method simulation real lens and can produce deviation, including equipment self
The non-systemic deviation that precise degrees difference produces, and the systematic bias produced due to the limitation of mathematical model itself, work as target
When the horizontal plane normal of control point is moved in face, owing in model, target surface exists border, the meeting when target surface has intersection point with normal
Produce the change of apex coordinate order, need to be revised in the algorithm；
Step 4: the choosing of control point when position, many control points covers, the content in comprehensive Visual field analysis, region easy to identify, maximum prison
Control surface analysis, area priorities easy to identify is higher than recognizable region, and recognizable region is higher than having occlusion area, region easy to identify
When still having a coincidence, acquiescence selects from the nearest control point of Chosen Point, and when only can recognize that region overlay, acquiescence selects from Chosen Point
Near control point；
Step 5: video camera links with GIS-Geographic Information System, in selected GIS-Geographic Information System, certain point calls monitor video；Geographical letter
Breath system selectes certain video camera according to Visual field analysis；Algorithm receives selected camera parameters, the coordinate of Chosen Point, calculates the visual field
The Cloud Terrace coordinate when being directed to Chosen Point, and visible range apex coordinate of projection quadrilateral on map are moved in center；According to
Visual field covering path is analyzed, and calculates critical zoom magnification when four points of projection quadrilateral all fall in the range of delineation；With The Cloud Terrace
Coordinate, zoom magnification is parameter, returns to camera supervised system, and operational deflection video camera is to specifying position.
In a preferred embodiment of the present invention, the viewing area change of Parameters variation video camera in described step 2.2
Also include the change of video camera zoom magnification, camera pan-tilt changes in coordinates and camera parameters change.
In a preferred embodiment of the present invention, the process of described video camera zoom magnification change is: video camera zoom
During change, the spacing on video camera target surface and ground and video camera zoom magnification are proportionate change, with visible range size
Change in inverse correlation.
In a preferred embodiment of the present invention, the process of described camera pan-tilt changes in coordinates is: The Cloud Terrace coordinate becomes
The corresponding video camera of change is on the basis of initial position, and horizontal direction offset and vertical direction offset, when occurring partially
During shifting, target surface deflects respective angles therewith, according to pin-hole imaging principle visible range by initial rectangular transform be corresponding isosceles ladder
Shape, visible range apex coordinate can calculate via coordinate transform.
In a preferred embodiment of the present invention, described camera parameters includes resolution of video camera, visual angle, zoom model
Enclose, height above sea level, ground level and longitude and latitude.
In a preferred embodiment of the present invention, the actual measurement of described video camera viewing area call method is taken the photograph from calling to
Camera deflected into the appointment position time within 2 seconds.
The invention has the beneficial effects as follows: a kind of video camera viewing area call method of the present invention, synchronize the visual field with visual
Region, and allow element close to the need as far as possible in the visual field, can point to remote control camera in effective monitoring region and specify position enter
Row monitoring also transfers picture, deflects into the appointment position time from calling video camera, and efficiency was obviously improved more in the past, first
Time transfers required monitoring content, it is ensured that accuracy and real-time.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing, wherein:
Fig. 1 be under static state video camera at the visible range projection model schematic diagram of GIS-Geographic Information System；
Fig. 2 is the change in location schematic diagram of the lower video camera target surface of zoom magnification change；
Fig. 3 is the change schematic diagram in the lower visible range region of zoom magnification change；
Viewing area schematic diagram during visible range change of shape when Fig. 4 is photographic head deflection；
The mobile schematic diagram of visible range when Fig. 5 is the change of The Cloud Terrace coordinate；
Fig. 6 is video camera and GIS-Geographic Information System linkage schematic flow sheet.
Detailed description of the invention
Technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described enforcement
Example is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this area is common
All other embodiments that technical staff is obtained under not making creative work premise, broadly fall into the model of present invention protection
Enclose.
The embodiment of the present invention includes:
A kind of video camera viewing area call method, including step in detail below:
Step 1: analyze regarding video camera open country, synchronizes the visual field and viewing area；
Step 1.1: synchronize to show camera's range in real time, in GIS-Geographic Information System, display video camera is in current location
With the supervision scope under zoom, and supervision scope is allowed to follow the change of video camera and to change in real time；
Step 1.2: video camera maximum monitors that scope is estimated, calculates every video camera viewing area under each zoom and people
Supervision scope easy to identify, for selecting suitable camera supervised specified point position to prepare；
Step 1.3: the building sheltering analysis to the visual field, based on the visual field selected determine in the case of, carry out further blocking point
Analysis, and in GIS-Geographic Information System, drawing the road not being blocked；
Step 1.4: visual field covering path regional analysis, according to actual needs, for monitor coverage area in GIS-Geographic Information System
The delimitation key area, every section in territory；
Step 2: viewing area is analyzed, and sets up the model of video camera, and video camera viewing area in GIS-Geographic Information System can be waited
Valency is in video camera target surface projection coordinate's tie region in two-dimensional map plane；
Step 2.1: the viewing area of video camera under resting state, according to video camera physical message, by being calculated video camera
Target surface and shot boundary, so calculate camera coverage be projected in ground region；
Step 2.2: the viewing area change of Parameters variation video camera, photographic head deflection and zoom operate, and all can make visual
Region changes, and due to the geographical location information of video camera, the existence of original state error makes calculating have deviation, therefore needs
Analyze the impact on model of each factor；
Step 3: realize algorithm, at Visual field analysis, the GIS-Geographic Information System that viewing area is analyzed links with video camera, and video camera refers to
Realize by corresponding mathematical algorithm to the actual application specifying position；
Step 3.1: viewing area apex coordinate calculates, calculates including target position and floor projection calculates
Step 3.2: Systematic Errors correction, is moved by mathematical method simulation real lens and can produce deviation, including equipment self
The non-systemic deviation that precise degrees difference produces, and the systematic bias produced due to the limitation of mathematical model itself, work as target
When the horizontal plane normal of control point is moved in face, owing in model, target surface exists border, the meeting when target surface has intersection point with normal
Produce the change of apex coordinate order, need to be revised in the algorithm；
Step 4: the choosing of control point when position, many control points covers, the content in comprehensive Visual field analysis, region easy to identify, maximum prison
Control surface analysis, area priorities easy to identify is higher than recognizable region, and recognizable region is higher than there being occlusion area.Region easy to identify
When still having a coincidence, acquiescence selects from the nearest control point of Chosen Point, and when only can recognize that region overlay, acquiescence selects from Chosen Point
Near control point；
Step 5: video camera links with GIS-Geographic Information System, in selected GIS-Geographic Information System, certain point calls monitor video；Geographical letter
Breath system selectes certain video camera according to Visual field analysis；Algorithm receives selected camera parameters, the coordinate of Chosen Point, calculates the visual field
The Cloud Terrace coordinate when being directed to Chosen Point, and visible range apex coordinate of projection quadrilateral on map are moved in center；According to
Visual field covering path is analyzed, and calculates critical zoom magnification when four points of projection quadrilateral all fall in the range of delineation；With The Cloud Terrace
Coordinate, zoom magnification is parameter, returns to camera supervised system, and operational deflection video camera is to specifying position.
In above-mentioned, in described step 2.2, the viewing area change of Parameters variation video camera also includes video camera zoom times
Number change, camera pan-tilt changes in coordinates and camera parameters change.
Wherein, the process of described video camera zoom magnification change is: during the change of video camera zoom, video camera target surface and ground
The spacing in face and video camera zoom magnification are proportionate change, are that inverse correlation changes with visible range size；Described takes the photograph
The process of camera The Cloud Terrace changes in coordinates is: The Cloud Terrace changes in coordinates correspondence video camera on the basis of initial position, horizontal direction angle
Side-play amount and vertical direction offset, when there is skew, target surface deflects respective angles, therewith according to pin-hole imaging principle
Visible range is corresponding isosceles trapezoid by initial rectangular transform, and visible range apex coordinate can calculate via coordinate transform；Institute
The camera parameters stated includes resolution of video camera, visual angle, zooming range, height above sea level, ground level and longitude and latitude.
The present invention comprises four partial contents: analyze regarding video camera open country, recallable amounts, it is achieved algorithm, application flow.
One, camera coverage analysis:
In the present invention, in GIS-Geographic Information System, the picture shown by video camera is referred to as the visual field, and video camera is in geography information system
The visual range of system display is referred to as visible range, and camera coverage analysis is intended to synchronize the visual field and visible range, and allows element in the visual field
Close to the need as far as possible.It is divided into following steps:
1) synchronize to show camera's range in real time；
2) video camera maximum monitors that scope is estimated；
3) building sheltering analysis to the visual field；
4) visual field covering path regional analysis.
Synchronize to show camera's range in real time:
In GIS-Geographic Information System, show video camera supervision scope under current location and zoom, and allow supervision scope follow
The change of video camera and change in real time.Wherein, people's supervision easy to identify scope refers in monitored picture, and naked eyes can see road conditions clearly
Scope, be the subregion of maximum supervision scope.When video camera move with zoom after, the video camera visible range table on map
Reveal respective change.
Video camera maximum monitors that scope is estimated:
Calculate every video camera visible range under each zoom and people's supervision easy to identify scope, for selecting suitable video camera
Prepare in monitoring specified point position.
The building sheltering analysis to the visual field:
Based on the visual field selected determine in the case of, carry out sheltering analysis further.In the range of intelligent transportation is more concerned with visible range
Condition of road surface, and building etc. can block road surface, therefore is necessary to carry out sheltering analysis.GIS-Geographic Information System is drawn not by
The road blocked.
Visual field covering path regional analysis:
Relative to security monitoring, traffic monitoring focuses more on road area, and therefore when calling monitoring, comprising content in the visual field should
To pay close attention to key element, i.e. means of transportation and road.According to actual needs, for territory, monitor coverage area in GIS-Geographic Information System
Delimitation key area, every section.
Two, viewing area is analyzed:
Setting up the model of video camera, video camera visible range in GIS-Geographic Information System can be equivalent to video camera target surface two-dimensionally
Projection coordinate's tie region on plan.It is divided into following steps:
1) visible range of video camera under resting state；
2) the visible range change of Parameters variation video camera.
The visible range of video camera under resting state:
According to video camera physical message, by can be calculated target surface and the shot boundary of video camera, and then video camera can be calculated regard
Open country is projected in ground region, as shown in Figure 1.
The visible range change of video camera during Parameters variation:
Photographic head deflects, and zoom operates, all can make with change, due to the geographical location information of video camera, just
The existence of beginning state error all can make calculating have deviation, it is therefore desirable to analyzes the impact on model of each factor.It is divided into following step
Rapid:
1) video camera zoom magnification change；
2) camera pan-tilt changes in coordinates；
3) camera parameters change.
Video camera zoom magnification changes:
During the change of video camera zoom, the spacing on video camera target surface and ground and video camera zoom magnification are proportionate change, with
Visible range size is inverse correlation change, as shown in Figures 2 and 3.
Camera pan-tilt changes in coordinates:
The Cloud Terrace changes in coordinates correspondence video camera is on the basis of initial position, and horizontal direction offset and vertical direction angle are inclined
Shifting amount.When there is skew, target surface deflects respective angles, therewith according to pin-hole imaging principle (Fig. 4) visible range by initial rectangle
Being transformed to corresponding isosceles trapezoid, visible range apex coordinate can calculate (Fig. 5) via coordinate transform.
Camera parameters changes:
Owing to practical situation limits, the height above sea level of each photographic head, ground level, initial angle is different, and this method is all
Equipment sets up single camera parameters calibration coordinate, comprises resolution of video camera, visual angle, zooming range, height above sea level, ground
Highly, longitude and latitude etc..
Three, respective algorithms principle
At Visual field analysis, the GIS-Geographic Information System of recallable amounts links with video camera, and video camera points to the reality specifying position
Application is realized by corresponding mathematical algorithm.Comprise:
1) visible range apex coordinate calculates；
2) Systematic Errors correction.
Visible range apex coordinate calculates:
The calculating of visible range apex coordinate includes that target position calculates and floor projection calculates.Visible range region is target surface with prison
Control point is light source, the apex coordinate to target surface projection in the horizontal plane.Distance between target surface and control point and zoom magnification
Positive correlation, target surface deflection angle is the deflection angle of video camera.Target surface summit is transformed into the calculating on floor projection summit and meets
Math matrix calculates.
Systematic Errors correction:
Moved by mathematical method simulation real lens and can produce deviation, the nonsystematic produced including equipment self precise degrees difference
Sexual deviation, and the systematic bias produced due to the limitation of mathematical model itself.When target surface moves the horizontal plane of control point
During normal, owing in model, target surface exists border, the change of apex coordinate order can be produced when target surface has intersection point with normal, need
To be revised in the algorithm.
Four, when position, many control points covers, control point chooses
There is coincidence in the region monitoring covering in practical situation more, and visual effect has difference, the method covered with the visual field merely
It is difficult to call most suitable control point.
Content in comprehensive Visual field analysis, region easy to identify, maximum monitoring range analysis, area priorities easy to identify is higher than
Recognizable region, recognizable region is higher than there being occlusion area.When still there is coincidence in region easy to identify, acquiescence selects nearest from Chosen Point
Control point, when only can recognize that region overlay, acquiescence selects from the nearest control point of Chosen Point.
Five, video camera and GIS-Geographic Information System linkage flow process
As shown in Figure 6, link schematic flow sheet for video camera and GIS-Geographic Information System,
1. select certain point in GIS-Geographic Information System and call monitor video；
2. GIS-Geographic Information System selectes certain video camera according to Visual field analysis；
3. algorithm receives selected camera parameters, the coordinate of Chosen Point.Calculate central region to move when being directed to Chosen Point
The Cloud Terrace coordinate, and visible range apex coordinate of projection quadrilateral on map；
4. analyze according to visual field covering path, calculate the critical zoom times when four points of projection quadrilateral all fall in the range of delineation
Number；
5. with The Cloud Terrace coordinate, zoom magnification is parameter, returns to camera supervised system, and operational deflection video camera is to specific bit
Put.
The analysis method of the present invention and corresponding algorithm have been erected at public security bureau of Suzhou City and have handed over garden group of patrol police detachment to use,
It is the most frequently used operation that monitoring is maked an inspection tour, and surveys and deflects into the appointment position time within 2 seconds from calling video camera, and first before
Determine direction and section, then look for suitable control point, the required time of last adjustment direction and zoom magnification more than at least 10 seconds, root
The most according to proficiency difference, efficiency was obviously improved more in the past.
In sum, a kind of video camera viewing area call method of the present invention, synchronize the visual field and viewing area, and allow and regard
Yezhong element close to the need as far as possible, can point to remote control camera in effective monitoring region and specify position to be monitored and transfer
Picture, deflects into the appointment position time from calling video camera, and efficiency was obviously improved more in the past, transfers required in the very first time
The monitoring content wanted, it is ensured that accuracy and real-time.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilize this
Equivalent structure or equivalence flow process that bright description is made convert, or are directly or indirectly used in other relevant technology neck
Territory, is the most in like manner included in the scope of patent protection of the present invention.
Claims (6)
1. a video camera viewing area call method, it is characterised in that include step in detail below:
Step 1: analyze regarding video camera open country, synchronizes the visual field and viewing area；
Step 1.1: synchronize to show camera's range in real time, in GIS-Geographic Information System, display video camera is in current location
With the supervision scope under zoom, and supervision scope is allowed to follow the change of video camera and to change in real time；
Step 1.2: video camera maximum monitors that scope is estimated, calculates every video camera viewing area under each zoom and people
Supervision scope easy to identify, for selecting suitable camera supervised specified point position to prepare；
Step 1.3: the building sheltering analysis to the visual field, based on the visual field selected determine in the case of, carry out further blocking point
Analysis, and in GIS-Geographic Information System, drawing the road not being blocked；
Step 1.4: visual field covering path regional analysis, according to actual needs, for monitor coverage area in GIS-Geographic Information System
The delimitation key area, every section in territory；
Step 2: viewing area is analyzed, and sets up the model of video camera, and video camera viewing area in GIS-Geographic Information System can be waited
Valency is in video camera target surface projection coordinate's tie region in two-dimensional map plane；
Step 2.1: the viewing area of video camera under resting state, according to video camera physical message, by being calculated video camera
Target surface and shot boundary, so calculate camera coverage be projected in ground region；
Step 2.2: the viewing area change of Parameters variation video camera, photographic head deflection and zoom operate, and all can make visual
Region changes, and due to the geographical location information of video camera, the existence of original state error makes calculating have deviation, therefore needs
Analyze the impact on model of each factor；
Step 3: realize algorithm, at Visual field analysis, the GIS-Geographic Information System that viewing area is analyzed links with video camera, and video camera refers to
Realize by corresponding mathematical algorithm to the actual application specifying position；
Step 3.1: viewing area apex coordinate calculates, calculates including target position and floor projection calculates
Step 3.2: Systematic Errors correction, is moved by mathematical method simulation real lens and can produce deviation, including equipment self
The non-systemic deviation that precise degrees difference produces, and the systematic bias produced due to the limitation of mathematical model itself, work as target
When the horizontal plane normal of control point is moved in face, owing in model, target surface exists border, the meeting when target surface has intersection point with normal
Produce the change of apex coordinate order, need to be revised in the algorithm；
Step 4: the choosing of control point when position, many control points covers, the content in comprehensive Visual field analysis, region easy to identify, maximum prison
Control surface analysis, area priorities easy to identify is higher than recognizable region, and recognizable region is higher than having occlusion area, region easy to identify
When still having a coincidence, acquiescence selects from the nearest control point of Chosen Point, and when only can recognize that region overlay, acquiescence selects from Chosen Point
Near control point；
Step 5: video camera links with GIS-Geographic Information System, in selected GIS-Geographic Information System, certain point calls monitor video；Geographical letter
Breath system selectes certain video camera according to Visual field analysis；Algorithm receives selected camera parameters, the coordinate of Chosen Point, calculates the visual field
The Cloud Terrace coordinate when being directed to Chosen Point, and visible range apex coordinate of projection quadrilateral on map are moved in center；According to
Visual field covering path is analyzed, and calculates critical zoom magnification when four points of projection quadrilateral all fall in the range of delineation；With The Cloud Terrace
Coordinate, zoom magnification is parameter, returns to camera supervised system, and operational deflection video camera is to specifying position.
Video camera viewing area the most according to claim 1 call method, it is characterised in that join in described step 2.2
The viewing area change of number change video camera also includes the change of video camera zoom magnification, camera pan-tilt changes in coordinates and shooting
Machine Parameters variation.
Video camera viewing area the most according to claim 2 call method, it is characterised in that described video camera zoom times
The process of number change is: during the change of video camera zoom, the spacing on video camera target surface and ground and video camera zoom magnification are in just
Associated change, is inverse correlation change with visible range size.
Video camera viewing area the most according to claim 2 call method, it is characterised in that described camera pan-tilt is sat
The process of mark change is: The Cloud Terrace changes in coordinates correspondence video camera is on the basis of initial position, and horizontal direction offset is with vertical
Nogata is to offset, and when there is skew, target surface deflects respective angles, therewith according to pin-hole imaging principle visible range by just
The rectangular transform begun is corresponding isosceles trapezoid, and visible range apex coordinate can calculate via coordinate transform.
Video camera viewing area the most according to claim 2 call method, it is characterised in that described camera parameters bag
Include resolution of video camera, visual angle, zooming range, height above sea level, ground level and longitude and latitude.
Video camera viewing area the most according to claim 1 call method, it is characterised in that described video camera visible area
The actual measurement of territory call method deflects into the appointment position time within 2 seconds from calling video camera.
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