CN101576926A - Monitor video searching method based on geographic information system - Google Patents
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Abstract
The invention discloses a monitor video searching method based on a geographic information system, which comprises the following steps of: recording the range of monitoring area which can be displayed on GIS in the shot target area of a monitoring camera when the monitoring camera shoots a video; establishing a corresponding relation between a monitoring video clip and the range of monitored target area thereby; and according to the corresponding relation, searching the video of the monitoring area which covers the searching target area. According to the geographic position information, angle information and magnification information of the camera shooting the monitoring video, the method calculates the monitoring area of the shot video. The method monitors the change of parameters of the PTZ camera such as position, angle and the like, and stores the record of the change of the parameters so as to accurately present the change of monitoring range of the camera again in a certain time interval when needed.
Description
Technical field
The present invention relates to video retrieval technology, particularly relate to a kind of monitor video searching method based on Geographic Information System.
Background technology
Video monitoring system is the important component part of safe protection engineering.It is widely used in numerous occasions so that directly perceived, convenient, abundant information can be provided.In recent years, along with popularizing of broadband, development of computer, the raising of image processing techniques, video monitoring is applied to a plurality of fields just more and more widely.The basic service function of video monitoring provides the means to the real time monitoring of target occasion or destination object, and to the picture that the is monitored storage of recording a video, so that playback afterwards.In modern supervisory system, monopod video camera is the major equipment of real video monitoring and video record when carrying out.It mainly reaches the support The Cloud Terrace of being responsible for installation, fixed cameras by the video camera of being responsible for video acquisition and constitutes.The Cloud Terrace is applicable to and carries out scanning monitoring on a large scale that it can enlarge the monitoring range of video camera.Its high-speed rotation is to be realized by motor on the The Cloud Terrace, controls motor by the control signal that The Cloud Terrace equipment is sent specific format and accurately rotates and locate.
Video monitoring system operated in general 24 hours, and regularly recorded a video according to the video recording storage plan, also can be by manual activation or alarm triggered video recording.
Currently in supervisory system the main dependence of the retrieval of video is manually carried out, complex operation takes time and effort.And modern video retrieval technology is divided into two classes from see in form: one is based on the retrieval of text (key word), and its recall precision depends on the textual description to video, and its difficult point is how video is carried out accurately comprehensively describing; Two are based on the retrieval of content, are exactly content and context relation according to video, and the video data in the extensive video database is retrieved.It is in the feature and the content that do not have to extract and describe automatically under the artificial situation about participating in video.Its advantage is to retrieve by automatically extracting audiovisual features, and its difficult point is how similarity is calculated, and the user is difficult to find suitable example.The essence of these retrieval techniques all is for video or video segment add the label that contains searched targets information, and different is, these labels be by artificial interpolation or by computing machine by correlation analysis after interpolation automatically.
The video retrieval method of tackling face to face in video monitoring system mainly is to go to search one by one by the equipment of storing this video.Because The Cloud Terrace is rotating the variation that the regional extent of its monitoring is not being stopped.So the video record record is different time, the video information of zones of different scope.If search the video information in certain characteristics zone, for example, in the video information that will search in the past certain corner on square in ten hours, and rig camera only just can monitor this corner in part-time, so just need find out over all videos under this camera record in ten hours, and find out the video segment relevant with this corner regions by the mode of manual observation.
Therefore need a kind of video retrieval method fast, can find out the video of interesting areas in the video record in the different monitoring zone that monopod video camera write down of rotating.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of monitor video searching method based on Geographic Information System is provided.
Monitor video searching method based on Geographic Information System comprises the steps:
1) obtains geographic position, setting height(from bottom), the angularity correction value information on Geographic Information System of monopod video camera;
2) when the The Cloud Terrace instruction of monopod video camera issues, the content that sends a The Cloud Terrace instruction simultaneously is to monitoring module, monitor module detect The Cloud Terrace specify assign after, judge the influence of The Cloud Terrace instruction to the guarded region scope of the captured video of monopod video camera, and acquisition is to the relevant information of the influential instruction execution of The Cloud Terrace guarded region scope back The Cloud Terrace, relevant information is meant the level angle and vertical corner information of video camera, CCD enlargement factor during shooting, and the The Cloud Terrace incident that causes above parameter to change, the action of assigning and carry out of a The Cloud Terrace instruction is called the The Cloud Terrace incident;
3) generate the geographical time tag of monopod video camera according to the correlation parameter that obtains;
4) be mapped on the video segment with geographical time tag record in order, and according to temporal corresponding relation;
5) when recording a video retrieval, take out the relevant information that can represent video monitoring regional in the geographical time tag, calculate the monitoring range of monopod video camera on GIS;
6) the geographic area that geographical time tag reflected and the target area of retrieval are mated, find out covering by the video record of geographical time tag in the pairing time period of seek area.
The correlation parameter that described basis is obtained generates the geographical time tag step of monopod video camera:
1) fills in concluding time of a last geographical time tag of monopod video camera, calculate and rewrite the relevant information of a geographical time tag, make angle information, the CCD enlargement factor information when taking when taking accurately reflect angle information, the CCD enlargement factor of the monopod video camera of this geographical time tag finish time;
2) generate a new geographical time tag, fill in zero-time;
3) according to the The Cloud Terrace incident that causes generating geographical time tag, the content of different The Cloud Terrace incidents being filled in different geographical time tags.
Described with geographical time tag record in order, and be mapped to step on the video segment according to temporal corresponding relation:
1) obtains the zero-time of video segment, concluding time, the monopod video camera of capture video;
2) search all geographical time tags of monopod video camera, find out the free overlapping geographical time tag of time period of time period and video segment;
Geographical time tag collection and this video segment that 3) will find are mapped.
Describedly take out the The Cloud Terrace relevant information in the geographical time tag, calculate the monitoring range step of monopod video camera on Geographic Information System recording a video when retrieval:
1) according to the The Cloud Terrace relevant information in the geographical time tag, set up the ken rectangular pyramid of monopod video camera on GIS, the trapezoidal cross surface on the geographical plane of ken rectangular pyramid and map is the projection of the visual 2 dimensional region of The Cloud Terrace on map;
2) according to the The Cloud Terrace relevant information in the geographical time tag, calculate the geometric parameter of the trapezoidal cross surface on the geographical plane of ken rectangular pyramid and map, the shape of trapezoidal cross surface is determined at vertical corner with The Cloud Terrace by the height of The Cloud Terrace, the size of trapezoidal cross surface is determined that by the CCD enlargement factor of The Cloud Terrace the position of trapezoidal cross surface is determined by the level angle of The Cloud Terrace.
Described the geographic area that geographical time tag reflected and the target area of retrieval are mated, find out covering by the video record step of geographical time tag in the pairing time period of seek area:
1) mate with the figure of the target area of retrieving on Geographic Information System successively in the zone that geographical time tag calculated of concentrating according to the pairing geographical time tag of video segment;
2) find out the affiliated geographical time tag that two figures have overlapping areas;
3) video segment in the beginning and ending time of these geographical time tags is taken out, and, present as Query Result according to the time order and function sequential combination.
The present invention connects the monitor video video recording geographic area scope with its monitoring, can carry out easily realizing that according to the zone that video content is monitored video searches.And need not be by searching that manual type takes time and effort.
Description of drawings
Fig. 1 is the process flow diagram based on the monitor video searching method of Geographic Information System;
Fig. 2 is the monopod video camera guarded region synoptic diagram of the embodiment of the invention.
Embodiment
Monitor video searching method based on Geographic Information System comprises the steps:
1) obtain geographic position, setting height(from bottom), the angularity correction value information on Geographic Information System of monopod video camera, monopod video camera is the object in the Geographic Information System, and above informational needs is artificial to be gathered also in the input Geographic Information System, takes out when needed.
2) when the The Cloud Terrace instruction of monopod video camera issues, the content that sends a The Cloud Terrace instruction simultaneously is to monitoring module, monitor module detect The Cloud Terrace specify assign after, judge the influence of The Cloud Terrace instruction to the guarded region scope of the captured video of monopod video camera, if the The Cloud Terrace instruction is switched for prefabricated position, presetting bit is cruised, rapid change, The Cloud Terrace is turned left, The Cloud Terrace is turned right, The Cloud Terrace upwards changes, The Cloud Terrace changes downwards, then obtains the relevant information to the influential instruction execution of The Cloud Terrace guarded region scope back The Cloud Terrace, and relevant information is meant the level angle and vertical corner information of video camera, CCD enlargement factor during shooting, and the The Cloud Terrace incident that causes above parameter to change, the action of assigning and carry out of a The Cloud Terrace instruction is called the The Cloud Terrace incident;
3) generate the geographical time tag of monopod video camera according to the correlation parameter that obtains; With one be used to reflect the correlation parameter of monopod video camera in the certain hour section according to be called the geographical time tag of a The Cloud Terrace according to record.It was used to be illustrated in certain period, the situation of the static guarded region of monopod video camera or the guarded region dynamic change of monopod video camera.Can represent geographical time tag by use table PtzGeoIndex.Its main field has the ID of The Cloud Terrace equipment, enter this regional time, leave this regional time, the level angle of monopod video camera, the vertical angle of monopod video camera, the horizontal direction rotating speed of the The Cloud Terrace in this period and the rotating speed of vertical direction, the CCD enlargement factor of monopod video camera, the geographic coordinate position of monopod video camera in GIS causes producing the The Cloud Terrace event type of this label.
The Cloud Terrace instruction according to seven classes may exert an influence the guarded region scope to monopod video camera is divided into the The Cloud Terrace incident of following seven types with it:
The presetting bit handover event---switch to the position that the target presetting bit sets corresponding to monopod video camera from any other position.This incident will cause the generation of a geographical time tag of new The Cloud Terrace.Owing to think that incident is to take place moment, this label enter the current time in system that this regional time is filled in the server when The Cloud Terrace instruction is monitored module and received event notice, this regional time of leaving of this incident will be inserted when next The Cloud Terrace incident takes place.The The Cloud Terrace level angle of this label and The Cloud Terrace vertical angle are the level angle and the vertical angle of this presetting bit.The horizontal direction rotating speed of The Cloud Terrace and the rotating speed of vertical direction are nonsensical to the geographic area range computation of the incident generation label of the type, but for the succession of this information, with its be changed to this monopod video camera on the identical value of the geographical time tag of The Cloud Terrace.If the geographical time tag of The Cloud Terrace is article one record of this monopod video camera in database, then this value directly goes monopod video camera equipment or cradle head control center requests to obtain by service end.
The presetting bit incident of cruising can be regarded as the repeatedly set of presetting bit handover event, does not classify a class incident separately as.Instruction is cruised when sending with The Cloud Terrace in the place, it can be decomposed into a plurality of presetting bit handover events, thereby realizes the record to the geographical time tag of The Cloud Terrace.
The Cloud Terrace turns left, and turns right last commentaries on classics, following commentaries on classics incident.These four incidents have very big similarity.Corresponding to turning left that monopod video camera is assigned, turn right, upwards rotate and rotate order.Four incidents are not instantaneous finishes for this, enter the current time in system of this regional time when receiving event notice by the geographical time tag of the The Cloud Terrace of its generation for monitoring module from the The Cloud Terrace instruction, to must when incident-The Cloud Terrace stops the incident generation, fill at the next one of this class incident and leave this regional time, promptly insert the current system time when stopping the incident generation.The level angle of the monopod video camera of this label and vertical angle information extend this as, the level and the vertical angle value of the The Cloud Terrace of incident finish time, and it also stops to fill in the incident at The Cloud Terrace.The horizontal direction rotating speed of The Cloud Terrace and the rotating speed of vertical direction when incident takes place will be inherited identical value of the geographical time tag of The Cloud Terrace on this monopod video camera.If the geographical time tag of this The Cloud Terrace is article one record of this monopod video camera in database, then this value directly goes monopod video camera equipment or cradle head control center requests to obtain by service end.The represented geographic range of the geographical time tag of the The Cloud Terrace that this class incident is produced is the zone of a dynamic change.When calculating in the zoning, time that can be lasting according to incident, the type of incident, information calculations such as speed go out the continually varying zone.
The Cloud Terrace stops incident.Assign the order that stops operating to monopod video camera corresponding to the user.After finishing, The Cloud Terrace rotation incident must have The Cloud Terrace to stop incident.Independent The Cloud Terrace stops incident and can't the guarded region of monopod video camera be exerted an influence, so only stop incident and handled following The Cloud Terrace after above-mentioned The Cloud Terrace rotates incident closely.This incident is at first filled in the relevant field of the geographical time tag of a last The Cloud Terrace complete.Comprise the concluding time of filling in the geographical time tag of a The Cloud Terrace, calculate level angle and vertical corner when finishing.Generate a new geographical labels then, the start time is filled in the current time, and the concluding time fills in when being taken place by next incident.Event type is that The Cloud Terrace stops incident, and the corresponding field of other field and a last strip label is identical.
The Cloud Terrace rapid change incident, the instruction of the change monopod video camera rotating speed of assigning corresponding to the user.The Cloud Terrace is specified and is monitored module after listening to this instruction, obtains newly-installed horizontal rotating speed of this monopod video camera and vertical rotating speed in the command content.This event handling is to generate a geographical time tag of new The Cloud Terrace equally, but the geographical time tag of this The Cloud Terrace is except that the rotating speed of the horizontal direction rotating speed of The Cloud Terrace and vertical direction, and other field is filled in empty biography value, and event type is the rapid change incident.After next incident takes place, when producing The Cloud Terrace geography time tag, if find that the event type of the geographical time tag of a The Cloud Terrace is the rapid change incident, the new label of regeneration not then, be empty field and be to use new information cloud to fill in those, and the modification event type is the type of kainogenesis incident.Adopt this processing mode, can the directly influence of guarded region generation of current monopod video camera not calculated but have influence on later guarded region mainly due to the change of The Cloud Terrace speed.Can guarantee when calculating the camera supervised zone in the historical a certain moment the accurate speed parameter in the time of can obtaining this incident generation like this.
4) be mapped on the video segment with geographical time tag record in order, and according to temporal corresponding relation;
1) obtains the zero-time of video segment, concluding time, the monopod video camera of capture video;
2) search all geographical time tags of monopod video camera, find out the free overlapping geographical time tag of time period of time period and video segment;
Geographical time tag collection and this video segment that 3) will find are mapped.With the geographical time tag collection of these geographical time tags as this video segment.
4) adopt above-mentioned steps to handle to all video segments of participating in retrieval.
5) when recording a video retrieval, take out the relevant information that can represent video monitoring regional in the geographical time tag, calculate the monitoring range of monopod video camera on GIS;
1) according to the The Cloud Terrace relevant information in the geographical time tag, set up the ken rectangular pyramid of monopod video camera on GIS, the trapezoidal cross surface on the geographical plane of ken rectangular pyramid and map is the projection of the visual 2 dimensional region of The Cloud Terrace on map; The trapezoidal horizontal line farthest that can see for The Cloud Terrace and the intersection on the geographical plane of map of going to the bottom, trapezoidal upper base are the nearest horizontal line that can see of The Cloud Terrace and the intersection on map geography plane.
2) according to the The Cloud Terrace relevant information in the geographical time tag, calculate the geometric parameter of the trapezoidal cross surface on the geographical plane of ken rectangular pyramid and map, the shape of trapezoidal cross surface is determined at vertical corner with The Cloud Terrace by the height of The Cloud Terrace, the size of trapezoidal cross surface is determined that by the CCD enlargement factor of The Cloud Terrace the position of trapezoidal cross surface is determined by the level angle of The Cloud Terrace.Concrete calculation procedure is: the horizontal view angle (β h) of establishing video camera is as the ∠ BAC among Fig. 2, and (β v) is the ∠ MAN among Fig. 2 at the visual angle of vertical direction.The current location level angle α h=∠ VOP of The Cloud Terrace, vertical depression angle α v=∠ VAO, | OA|=H.Observed actual area is a trapezoid area BCDE, and the polar coordinates that calculate B, C, D, four points of E respectively just can calculate to be observed regionally.
If ∠ MAO is θ=α v-β v/2, so | OM|=H*tan θ, | AM|=H/cos θ.|BM|=|AM|*tan(βh/2)=(H/cosθ)*tan(βh/2),
Can calculate then ∠ BOM=arctan (| BM|/| OM|).∠BOP=αh-∠BOM。Try to achieve polar coordinates that B orders and be (| OB|, ∠ BOP).In like manner can obtain C, D, the polar coordinates of E so just can have been determined the position of trapezoidal cross surface on map and size.
6) the geographic area that geographical time tag reflected and the target area of retrieval are mated, find out covering by the video record of geographical time tag in the pairing time period of seek area.
According to the zone and the time period of query aim, restore during this period of time in monopod video camera scanned geographic area.This section zone and target area are mated, finally select all video recordings in the time period that the match is successful.
The time period of the target video of system requirements user input query and guarded region can be a circular scope of representing on GIS.Take out all video recordings in the objective time interval then, obtain the geographical time tag collection of its The Cloud Terrace, according to the geographical time tag of these The Cloud Terraces video is divided different time slices, each fragment is represented the pairing geographic area of its content.After the quadrilateral area scope that can represent on GIS that calculates the geographical time tag representative of The Cloud Terrace, it is overlapping whether the circle of judging the target retrieval scope then and the quadrilateral in actual monitored zone exist, and determines whether to mate.If the match is successful, then the video record in this pairing time period of The Cloud Terrace change records is and meets the result for retrieval that retrieval requires.With its taking-up, and present.
Claims (5)
1. the monitor video searching method based on Geographic Information System is characterized in that comprising the steps:
1) obtains geographic position, setting height(from bottom), the angularity correction value information on Geographic Information System of monopod video camera;
2) when the The Cloud Terrace instruction of monopod video camera issues, the content that sends a The Cloud Terrace instruction simultaneously is to monitoring module, monitor module detect The Cloud Terrace specify assign after, judge the influence of The Cloud Terrace instruction to the guarded region scope of the captured video of monopod video camera, and acquisition is to the relevant information of the influential instruction execution of The Cloud Terrace guarded region scope back The Cloud Terrace, relevant information is meant the level angle and vertical corner information of video camera, CCD enlargement factor during shooting, and the The Cloud Terrace incident that causes above parameter to change, the action of assigning and carry out of a The Cloud Terrace instruction is called the The Cloud Terrace incident;
3) generate the geographical time tag of monopod video camera according to the correlation parameter that obtains;
4) be mapped on the video segment with geographical time tag record in order, and according to temporal corresponding relation;
5) when recording a video retrieval, take out the relevant information that can represent video monitoring regional in the geographical time tag, calculate the monitoring range of monopod video camera on GIS;
6) the geographic area that geographical time tag reflected and the target area of retrieval are mated, find out covering by the video record of geographical time tag in the pairing time period of seek area.
2. a kind of monitor video searching method based on Geographic Information System according to claim 1 is characterized in that correlation parameter that described basis obtains generates the geographical time tag step of monopod video camera:
1) fills in concluding time of a last geographical time tag of monopod video camera, calculate and rewrite the relevant information of a geographical time tag, make angle information, the CCD enlargement factor information when taking when taking accurately reflect angle information, the CCD enlargement factor of the monopod video camera of this geographical time tag finish time;
2) generate a new geographical time tag, fill in zero-time;
3) according to the The Cloud Terrace incident that causes generating geographical time tag, the content of different The Cloud Terrace incidents being filled in different geographical time tags.
3. a kind of monitor video searching method based on Geographic Information System according to claim 1 is characterized in that describedly with geographical time tag record in order, and is mapped to step on the video segment according to temporal corresponding relation:
1) obtains the zero-time of video segment, concluding time, the monopod video camera of capture video;
2) search all geographical time tags of monopod video camera, find out the free overlapping geographical time tag of time period of time period and video segment;
Geographical time tag collection and this video segment that 3) will find are mapped.
4. a kind of monitor video searching method according to claim 1 based on Geographic Information System, it is characterized in that described when recording a video retrieval, take out the The Cloud Terrace relevant information in the geographical time tag, calculate the monitoring range step of monopod video camera on Geographic Information System:
1) according to the The Cloud Terrace relevant information in the geographical time tag, set up the ken rectangular pyramid of monopod video camera on GIS, the trapezoidal cross surface on the geographical plane of ken rectangular pyramid and map is the projection of the visual 2 dimensional region of The Cloud Terrace on map;
2) according to the The Cloud Terrace relevant information in the geographical time tag, calculate the geometric parameter of the trapezoidal cross surface on the geographical plane of ken rectangular pyramid and map, the shape of trapezoidal cross surface is determined at vertical corner with The Cloud Terrace by the height of The Cloud Terrace, the size of trapezoidal cross surface is determined that by the CCD enlargement factor of The Cloud Terrace the position of trapezoidal cross surface is determined by the level angle of The Cloud Terrace.
5. a kind of monitor video searching method according to claim 1 based on Geographic Information System, it is characterized in that described the geographic area that geographical time tag reflected and the target area of retrieval being mated, find out covering by the video record step of geographical time tag in the pairing time period of seek area:
1) mate with the figure of the target area of retrieving on Geographic Information System successively in the zone that geographical time tag calculated of concentrating according to the pairing geographical time tag of video segment;
2) find out the affiliated geographical time tag that two figures have overlapping areas;
3) video segment in the beginning and ending time of these geographical time tags is taken out, and, present as Query Result according to the time order and function sequential combination.
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