WO2012134235A2 - Procédé et système destinés à générer un modèle de terrain basé sur un traitement parallèle - Google Patents

Procédé et système destinés à générer un modèle de terrain basé sur un traitement parallèle Download PDF

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Publication number
WO2012134235A2
WO2012134235A2 PCT/KR2012/002412 KR2012002412W WO2012134235A2 WO 2012134235 A2 WO2012134235 A2 WO 2012134235A2 KR 2012002412 W KR2012002412 W KR 2012002412W WO 2012134235 A2 WO2012134235 A2 WO 2012134235A2
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unit
model
terrain model
terrain
generating
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English (en)
Korean (ko)
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WO2012134235A3 (fr
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김기태
정원조
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SK C&C Co Ltd
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SK C&C Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three-dimensional [3D] modelling for computer graphics
    • G06T17/05—Geographic models
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three-dimensional [3D] modelling for computer graphics
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three-dimensional [3D] modelling for computer graphics
    • G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three-dimensional [3D] modelling for computer graphics
    • G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
    • G06T17/205—Re-meshing
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T19/00—Manipulating three-dimensional [3D] models or images for computer graphics
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2210/00—Indexing scheme for image generation or computer graphics
    • G06T2210/52—Parallel processing

Definitions

  • the present invention relates to terrain model generation, and more particularly, to a method and system for generating a terrain model based on parallel processing.
  • Aerial photographs are usually taken by digital cameras mounted on aircraft with GPS / INS.
  • the aerial photographs are produced as topographic maps or topographical models based on an external orientation parameter and a digital elevation model (DEM: Digital Terrain Model).
  • DEM Digital Terrain Model
  • the conventional method of generating a terrain model such as a digital surface model (DSM) and a DEM of a region of interest (ROI) using aerial photographs stores all image data included in the target region, Using the stored image data, a terrain model of the target area is produced.
  • DSM digital surface model
  • ROI region of interest
  • the present invention is derived to solve the above problems of the prior art, by dividing a region of interest (ROI) to create a terrain model into predetermined unit regions, and processing the divided unit regions in parallel It is an object of the present invention to provide a parallel processing based terrain model generation method and system that can generate a terrain terrain model.
  • ROI region of interest
  • Another object of the present invention is to provide a parallel processing-based terrain model generation method and system capable of updating only a terrain model of a unit area requiring updating when a terrain model of a target area needs to be updated.
  • the terrain model generation method comprises the steps of: dividing the target area for generating the terrain model into a plurality of unit areas; Searching for unit image data corresponding to each of the plurality of unit regions among a plurality of image data representing at least a portion of the target region; Generating a unit terrain model of each of the unit regions by using the searched unit image data; And generating a terrain model of the target area by using the generated unit terrain model.
  • the generating of the unit topographical model may generate the unit topographical model by parallel processing each of the unit regions corresponding to the unit image data.
  • the unit image data corresponding to each of the unit regions may be parallelly searched for each of the unit regions.
  • the method may further include determining a virtual ground corresponding to the target area from one or more preset virtual earths, wherein the dividing may include forming the virtual ground corresponding to the determined target area into the unit areas. Can be divided into
  • the virtual ground may be a shuttle radar topographic mission (SRTM) or a digital elevation model (DEM), and the terrain model may be a digital surface model (DSM), a digital elevation model (DEM), orthogonal images. And a building model.
  • SRTM shuttle radar topographic mission
  • DEM digital elevation model
  • DSM digital surface model
  • DEM digital elevation model
  • orthogonal images and a building model.
  • the dividing may include dividing the target area into the plurality of unit areas by using a grid method.
  • the terrain model of the target area may be updated only by the unit terrain model of the unit area to be updated among the unit areas.
  • a method of generating a terrain model comprising: dividing the target area into a plurality of unit areas by using region information of the target area for generating the terrain model; Generating a unit topographical model of each of the plurality of unit regions by using the plurality of image data of the target region; And generating a terrain model of the target area by using the generated unit terrain model.
  • a terrain model generation system includes a divider for dividing a target area for generating a terrain model into a plurality of unit areas; A search unit searching for unit image data corresponding to each of the plurality of unit regions, from among a plurality of image data representing at least part of the target region; A plurality of unit model generators generating unit terrain models of each of the unit regions by using the searched unit image data; And a region model generator configured to generate a terrain model of the target region using the generated plurality of unit terrain models, wherein the plurality of unit model generators generate the unit terrain model by processing each of the unit regions in parallel. can do.
  • the area model generator may merge the plurality of unit terrain models, and generate a terrain model of the target area by processing joint portions of the merged unit terrain models.
  • An apparatus for generating a terrain model includes a receiver configured to receive a target unit region among unit regions of a divided target region for parallel processing and unit image data for the target unit region; A model generator configured to generate a unit terrain model corresponding to the target unit region by using the received target unit region and the unit image data; And a device for generating a terrain model of the target area by using the unit terrain model of the unit areas constituting the target area, and may include a providing unit providing a unit terrain model corresponding to the generated target unit area.
  • the receiver may include a searcher for searching for the unit image data including at least a portion of the target unit virtual ground, from among a plurality of image data representing at least a portion of the target area.
  • a target area After dividing into a plurality of unit regions, a unit topography model of each of the divided unit regions may be generated through parallel processing.
  • the present invention prevents the memory, calculation amount, and processing time from increasing as the amount of related data such as image data and modeling data increases through parallel processing, and quickly generates a terrain model of a target region through this process. can do.
  • the present invention may select or confirm an update unit area requiring updating to generate only an update unit terrain model for the corresponding update unit area. According to the present invention, by replacing the previous unit terrain model of the corresponding unit area with the generated update unit terrain model, it is possible to easily correct an error existing in the terrain model of the target area or update the terrain model due to the change of the feature. .
  • FIG. 1 illustrates a configuration of a terrain model generation system according to an embodiment of the present invention.
  • FIG. 2 illustrates a configuration of an embodiment of the apparatus for generating a regional model shown in FIG. 1.
  • FIG. 3 is a diagram illustrating a configuration of an embodiment of a unit model generating apparatus shown in FIG. 1.
  • FIG. 4 is a flowchart illustrating an operation method for generating a terrain model according to an embodiment of the present invention.
  • FIG 5 shows an example of a divided form of the virtual ground of the target area in the present invention.
  • FIG. 6 shows another example of the divided form of the virtual ground of the target area in the present invention.
  • FIG. 7 is a flowchart illustrating an embodiment of an update process for updating a terrain model of a target area in the terrain model generation method according to the present invention.
  • FIG. 8 illustrates a configuration of another embodiment of the apparatus for generating a regional model shown in FIG. 1.
  • FIG. 1 illustrates a configuration of a terrain model generation system according to an embodiment of the present invention.
  • the terrain model generation system includes a regional model generation device 110 and a plurality of unit model generation devices 120.
  • the region model generating apparatus 110 is a apparatus for generating a terrain model of a region of interest (ROI).
  • the regional model generation device 110 receives a unit terrain model of a divided unit area of a target area from a plurality of unit model generation devices 120 capable of parallel processing, and merges the received plurality of unit terrain models of a target area. Create a terrain model.
  • the region model generating apparatus 110 may generate a terrain model of the target region by processing a joint portion between the plurality of unit terrain models.
  • the regional model generating apparatus 110 divides a virtual earth (virtual earth or virtual terrain) of a target region into a plurality of unit regions, and then provides information about the corresponding unit region to the plurality of unit model generating apparatuses 120.
  • Each of the plurality of unit model generating apparatuses 120 may search for unit image data of a corresponding unit region and generate a unit terrain model of the corresponding unit region by using the found unit image data.
  • the virtual ground may be generated by using a shuttle radar topographic mission (SRTM) or a digital elevation model (DEM) or information about a target region (including at least geographic coordinate information).
  • the terrain model may include a digital surface model (DSM), a digital elevation model (DEM), an orthoimage, a building model, and a 3D city model that combines the digital elevation model and the building model.
  • the unit terrain model generated by the unit model generating apparatus 120 refers to a terrain model for a corresponding unit area.
  • Unit terrain models may include digital surface models (DSMs), digital elevation models (DEMs), ortho-images, building models, and 3D city models that combine digital elevation models and building models in the unit area. Can be.
  • the unit image data refers to image data including at least a part of the corresponding unit region among the image data corresponding to the target region.
  • the image data used in the present invention includes an image or a photograph taken for the purpose of generating a terrain model, a photograph taken by a general optical camera, a multi-spectral image, an aerial photograph, a satellite. Pictures, LiDAR photographing data, and the like.
  • the regional model generating apparatus 110 searches for unit image data corresponding to each of the divided unit regions, and discovers the unit image data and information about the unit region (at least, information about geographic coordinates). It may be provided to each of the plurality of unit model generating device 120, to generate a unit terrain model for the corresponding unit area in each of the plurality of unit model generating device 120.
  • the regional model generating device 110 may 1) provide unit area information corresponding to the corresponding unit model generating device 120 to each of the plurality of unit model generating devices 120, and 2) generate a plurality of unit models.
  • Each of the devices 120 may provide unit area information and corresponding unit image data corresponding to the unit model generating device 120.
  • the regional model generating apparatus 110 may include both cases of 1) and 2), and the system configuration of the embodiment according to the present invention includes a load in the regional model generating apparatus 110. It may be selected in consideration.
  • the case of 1) since the load is distributed to reduce the memory usage, the calculation amount, and the processing time, the case of 1) may be more preferable to reduce the load of the regional model generating apparatus 110.
  • the case 1) will be described as an example.
  • the region model generating apparatus 110 may update the terrain model of the target region.
  • the regional model generating apparatus 110 when the update of the terrain model of the target area is required, when the unit area requiring updating is selected (or confirmed) from the terrain model of the target area, the regional model generating apparatus 110 is located in the selected (or confirmed) unit area.
  • the updated unit terrain model may be requested to the corresponding unit model generation device 120.
  • the regional model generation device 110 receives the updated unit terrain model from the unit model generation device 120 of the corresponding unit area, and replaces the previous unit terrain model of the corresponding unit area with the updated unit terrain model to replace the terrain model of the target area. Can be updated.
  • the selection of the unit area to be updated means a process of selecting a unit area to be updated by a user or an external input, and the confirmation of the unit area to be updated is performed to the regional model generating apparatus 110 or an external comparison system.
  • This may mean a process of automatically identifying a unit area requiring updating through a comparison process between previously generated image data and newly generated image data.
  • An embodiment of the present invention may include a case in which the update unit area is directly selected by the user, or may include a case in which the update unit area is automatically confirmed by the device.
  • the unit model generating apparatus 120 may receive information about a unit region or a unit region corresponding to the unit model generating apparatus 120 among the divided unit regions of the target region from the region model generating apparatus 110.
  • the unit model generating apparatus 120 searches for unit image data corresponding to the unit region based on the received unit region information, and generates a unit terrain model of the unit region using the found unit image data.
  • unit terrain models such as DSM, DEM, orthoimage, building model, and 3D Citi model for a corresponding unit region may be generated in parallel, thereby generating a regional model generating apparatus (
  • the terrain model of the target area may be quickly generated by using the plurality of unit terrain models generated by each unit model generator 120.
  • the system according to the present invention generates a unit topography model of the unit regions of the target area by parallel processing in each of a separate process unit, that is, the unit model generating apparatus 120 corresponding to each unit region,
  • the terrain model of the target area is generated by merging the unit terrain models generated based on parallel processing, the amount of related data such as image data and modeling data can be distributed.
  • the parallel processing system of the present invention can reduce the time taken to generate the terrain model of the target area, and can reduce the processing time and the data calculation amount due to the distribution of the related data amount.
  • each of the unit model generating apparatuses 120 processed in parallel in FIG. 1 is divided and displayed as a separate device such as a computer or a server, the spirit of the present invention is not limited thereto.
  • Each device 120 may correspond to one device, for example, each of a plurality of processors provided in one server. That is, a plurality of unit topographical models may be generated by processing in parallel in a plurality of devices divided into separate devices, and a plurality of unit topographical models may be processed in parallel by a plurality of processors included in one device. You can also create
  • FIG. 2 illustrates a configuration of an embodiment of the apparatus for generating a regional model shown in FIG. 1.
  • the region model generating apparatus 110 includes a virtual ground determiner 210, a storage 220, a divider 230, and a region model generator 240.
  • the virtual ground determination unit 210 determines a virtual ground of a target area for generating a terrain model from one or more preset virtual grounds.
  • the virtual ground determined by the virtual ground determination unit 210 may be SRTM, may be a pre-stored DEM for the target region, or may be a specific ground generated based on information on the target region.
  • the previously stored DEM may be a rough DEM for a target region.
  • the storage unit 220 is configured to store a plurality of image data including at least a part of a target area, and stores not only a plurality of image data but also data on a virtual ground and various data for carrying out the present invention.
  • the storage unit 220 may separately configure a database (not shown) for storing a plurality of image data, for example, aerial image data for a region, and storage means for storing other types of data.
  • the database storing the plurality of image data may be configured as a separate server or a separate device instead of the regional model generating device.
  • the dividing unit 230 divides the virtual ground of the target area for generating the terrain model among the virtual grounds determined by the virtual ground determination unit 210 into a plurality of unit regions.
  • the divider 230 may divide the virtual ground of the target area in various ways.
  • the dividing unit 230 may divide the virtual ground of the target area into 16 unit regions ROI-1 to ROI-16 using a grid method.
  • the division unit 230 may divide the virtual ground of the target area into 16 unit regions ROI-1 to ROI-16 having a triangular shape, as shown in the example illustrated in FIG. 6.
  • the number of unit regions divided by the divider 230 is not limited to 16, and may be set in consideration of the amount of related data to be calculated and the number of unit model generating apparatuses.
  • the division unit 230 may determine and divide the shape of the unit areas of the virtual ground of the target area based on the information on the target area.
  • the regional model generating apparatus 110 provides information about each of the unit regions divided by the dividing unit 230 to the unit model generating apparatus 120 corresponding to the corresponding unit region, and the plurality of unit model generating apparatuses 120 Receive a unit topography model for each of the unit regions.
  • the region model generator 240 generates a terrain model of the target region using unit terrain models corresponding to the plurality of unit regions received from the plurality of unit model generators.
  • the regional model generation unit 240 generates a terrain model of the target area by merging the divided unit terrain models.
  • the joints between the unit terrain models are smoothly or smoothly processed.
  • Various methods can be applied.
  • the Poisson's equation can be applied to naturally handle joints between unit terrain models.
  • the region model generating apparatus may add a configuration function for the update if necessary to update the terrain model.
  • the configuration of the updating unit that performs the updating function is added to the configuration of FIG. 2.
  • the updater 250 selects an update unit area to be updated among unit areas of the target area when an update of the terrain model of the target area is requested, and the corresponding unit model generating device 120 corresponding to the selected update unit area. Request and receive update unit terrain model.
  • the unit model generating apparatus 120 searches for updated update unit image data of the corresponding unit region, generates an update unit terrain model based on this, and provides it to the regional model generating apparatus 110.
  • the updater 250 For example, assuming that the unit terrain model of the ROI-11 510 is to be updated among the unit areas shown in FIG. 5, the updater 250 generates a unit terrain model of the ROI-11.
  • the ROI-11 is requested to generate an update unit terrain model of the ROI-11, and when the update unit terrain model of the ROI-11 generated from the unit model generating apparatus is received, the updated unit terrain model is provided to the regional model generator 240.
  • the area model generator 240 updates the terrain model of the target area by using the update unit terrain model requested and received by the updater 250.
  • the terrain model generator 240 updates the previous unit terrain model corresponding to the update unit area. By replacing the model, the terrain model of the target area can be updated.
  • FIG. 3 is a diagram illustrating a configuration of an embodiment of a unit model generating apparatus shown in FIG. 1.
  • the unit model generating apparatus 120 includes a receiver 310, a model generator 320, and a provider 330.
  • the receiver 310 receives information on the corresponding unit area from the plurality of unit areas divided by the area model generating device from the area model generating device so that parallel processing is possible.
  • the receiver 310 includes a searcher 311, and searches for the unit image data including at least a part of the corresponding unit area by using the searcher 311, and searches the searched unit image data 311. Can be received via).
  • the receiver 310 receives the unit region (or information) and unit image data corresponding to the unit region.
  • the information about the unit area received by the receiver 310 may be information about the virtual ground of the corresponding unit area divided from the virtual ground of the target area.
  • the model generator 320 generates a terrain model of the corresponding unit area by using the information on the corresponding unit area and the unit image data received by the receiver 310.
  • the model generator 320 generates a terrain model of the unit region by using information about the virtual ground of the unit region and unit image data including at least a part of the unit region.
  • the model generator 320 selects at least one or more unit image data for generating a unit terrain model from the found plurality of unit image data, and uses the selected at least one unit image data to generate a unit terrain model of the corresponding unit area. Can be generated.
  • the provider 330 provides the unit terrain model generated from the model generator 320 to the region model generator so that the terrain model generator generates a terrain model of the target region using a plurality of unit terrain models. do.
  • FIG. 4 is a flowchart illustrating an operation method for generating a terrain model according to an embodiment of the present invention.
  • a target area for generating a terrain model is selected, and a virtual ground of the selected target area is determined (S410).
  • the target area is Yeouido and wants to generate a terrain model of Yeouido
  • one of at least one virtual ground is determined, and the virtual ground corresponding to the Yeouido region is selected from the determined virtual ground.
  • the virtual ground may be a ground generated based on SRTM, DEM, and region information on a target region.
  • the present invention is not limited thereto.
  • the virtual ground is generated based on region information on the target region and the generated virtual ground is generated. It may be determined by the virtual land of the target area.
  • the virtual ground of the determined target region is divided into a plurality of N unit regions, and parallel processing is performed on each of the divided unit regions.
  • Provide information S420, S430).
  • the unit image data including at least a portion of each of the unit regions is searched based on the information about each of the unit regions, and the unit terrain model of each of the unit regions is generated using the unit image data searched for each of the unit regions. It generates (S440).
  • the unit image data including at least a portion of the first unit region may be searched among the plurality of image data including at least a portion of the target region by using the information about the first unit region, and the searched image data may be used to search for the unit image data.
  • 1 Create a unit terrain model of the unit area.
  • unit image data including at least a portion of the second unit region is searched among the plurality of image data including at least a portion of the target region by using the information on the second unit region, and the searched image data is used to search for the unit image data.
  • the generated unit terrain model is a digital surface model (DSM), a digital elevation model (DEM), an orthoimage, a building model, and a 3D city model that combines a digital elevation model and a building model of the unit area. ) May be included.
  • the unit image data corresponding to each of the unit regions may be searched in parallel with respect to each of the unit regions, similarly to generating the unit terrain model.
  • the method for generating a terrain model divides a target area into a plurality of predetermined regions, and processes the terrain models for the plurality of divided predetermined regions in parallel, thereby generating a plurality of pieces of data necessary for generating the terrain model. Distributing them into process units reduces the amount of computation that needs to be processed and the amount of associated data that needs to be stored in each process unit, thereby reducing the time it takes to generate a topographic model of the target area.
  • each process unit that is, the unit model generating apparatus of FIG. 1 is described as parallel processing for each of the plurality of unit regions in step S440 shown in FIG. 4, parallel processing in the present invention is performed in one process unit. It is not limited to processing only the unit area of. For example, a process unit may sequentially process two unit regions, and a plurality of process units may perform parallel processing, and two process units may process three unit regions in parallel.
  • parallel processing is not limited to only mean that it is done at the same time, but includes all the processing that can be performed using a separate or distributed data path.
  • parallel processing may be performed independently in each processing unit, but at least some data may be performed dependently.
  • two process units may each process two separate data in parallel, but two process units may process two independent data of three independent data independently and one independent data together.
  • FIG. 7 is a flowchart illustrating an embodiment of an update process for updating a terrain model of a target area in the terrain model generation method according to the present invention.
  • the error existing in the terrain model of the target region may be corrected or the terrain may be caused by a change in the feature.
  • at least one unit area that needs to be updated is selected from among the plurality of unit areas for the terrain model of the target area (S710 and S720).
  • the updated update unit image data including at least a portion of the update unit region is searched for, and an update unit terrain model of the update unit region is generated using the searched update unit image data ( S730, S740).
  • the region model of the target area is updated by replacing the previous unit terrain model of the update unit area with the update unit terrain model.
  • a plurality of update unit areas are processed in parallel to generate update unit terrain models for the plurality of update unit areas.
  • the terrain model generation method may be implemented in the form of program instructions that may be executed by various computer means and may be recorded in a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.
  • Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts.
  • Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

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Abstract

Cette invention se rapporte à un procédé et à un système destinés à générer un modèle de terrain basé sur un traitement parallèle. Le procédé destiné à générer un modèle de terrain selon un mode de réalisation de la présente invention comprend les étapes consistant à : scinder une région cible en une pluralité de surfaces unitaires afin de générer un modèle de terrain ; rechercher des données d'images unitaires qui correspondent à chacune de la pluralité de surfaces unitaires, parmi la pluralité de données d'images qui représentent une partie au moins de la région cible ; générer un modèle de terrain unitaire de chacune des surfaces unitaires en utilisant les données d'images unitaires recherchées ; et générer un modèle de terrain de la région cible en utilisant le modèle de terrain unitaire généré, le modèle de terrain unitaire étant généré par un traitement parallèle de chacune des surfaces unitaires qui correspondent aux données d'images unitaires, en améliorant de ce fait la vitesse de génération du modèle de terrain en répartissant la charge et quand une mise à jour est nécessaire par la suite, la mise à jour de la seule surface unitaire à mettre à jour à partir de la région cible, peut être effectuée facilement.
PCT/KR2012/002412 2011-04-01 2012-03-30 Procédé et système destinés à générer un modèle de terrain basé sur un traitement parallèle Ceased WO2012134235A2 (fr)

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KR10-2011-0030386 2011-04-01

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KR102073675B1 (ko) 2019-07-26 2020-02-05 주식회사 우리아이씨티 Gnss, 토탈 스테이션, 지상라이다, 드론 기반 다차원 측량정보를 이용한 위험시설물의 관로 및 밸브 탐색 방법
KR102291532B1 (ko) * 2020-12-31 2021-08-20 경북대학교 산학협력단 필터를 사용한 지형 정보 처리 장치 및 방법

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