CN102929969A - Real-time searching and combining technology of mobile end three-dimensional city model based on Internet - Google Patents
Real-time searching and combining technology of mobile end three-dimensional city model based on Internet Download PDFInfo
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- CN102929969A CN102929969A CN201210388578XA CN201210388578A CN102929969A CN 102929969 A CN102929969 A CN 102929969A CN 201210388578X A CN201210388578X A CN 201210388578XA CN 201210388578 A CN201210388578 A CN 201210388578A CN 102929969 A CN102929969 A CN 102929969A
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Abstract
The invention relates to a real-time searching and combining technology of a mobile end three-dimensional city model based on Internet. The technology realizes a three-dimensional real city scene of shooting and obtaining an image of a mobile terminal including an intelligent cell phone and the like, namely a front face image of an interested city building can be shot by the mobile terminal; a size unchanged characteristic conversion descriptor is extracted and a non-linear encoding matrix is used for encoding and compressing; a server is connected through a wireless Internet and the three-dimensional city model is automatically searched from the Internet; the three-dimensional model which does not meet the requirements is automatically filtered and an optimal model is intelligently calculated; if the related three-dimensional model cannot be searched, the related image is searched; based on an image reconstruction three-dimensional model, the three-dimensional model and attribute information are automatically transferred to the mobile terminal to be overlapped with a two-dimensional map; and therefore, a user can browse and inquire region space information of the user in real time. The real-time searching and combining technology disclosed by the invention has a wide application prospect on the aspects of city navigation, space position service and the like.
Description
One, technical field
The present invention relates to a kind of mobile terminal three-dimensional city model real-time search and synthetic technology of Internet-based, belong to the Spatial Information Technology field.
Two, background technology
The Eleventh Five-Year Plan period, China's navigation is exceedingly fast with location-based service application development speed, the internet Map Services begins to develop to the mobile terminal from wired internet, and Google Maps, Nokia OVI, Tencent QQ map, 51 maps etc. both at home and abroad map products all successfully have been transplanted on many moneys mobile terminal operating system platforms such as iOS, Android, Sybian, Windows Mobile; Enter " 12 ", position-based service (LBS) industry is towards the public just experiencing the evolution of the figure track navigation that lands, life information search, three levels of position social networks." interactive intelligent, colony's mass-rent, Real-time Feedback, self-adaptation " becomes the major technique intension of LBS product towards the public.
The at present three-dimensional space model number growth on the internet is very fast, and a lot of websites (such as Google 3D Warehouse) communal space model is for user's free download.Believe that quantity, type and the verisimilitude of the three-dimensional city model on the internet can become better and approaching perfection day by day along with the further developing of space technology and infotech, can be more open; On the whole, utilize at present interconnected internet resource, can only search the in the world significant three-dimensional model in famous city.If can't obtain the three-dimensional model in city to be studied, can play up this part model based on image or video sequence by the image on the searching for Internet, because have the image that enriches of the most of regional different visual angles of earth surface on the internet.The search of three-dimensional space model on the Internet-based and a synthetic key problem are precise search three-dimensional models from the magnanimity internet data how.At present search engine technique still is confined to the text retrieval aspect, to the retrieval of image, video, three-dimensional model etc. normally by its relevant textual information of retrieval, therefore it is very low to search for the accuracy of these class data, model; On the other hand, for from large-scale graphic data, how index, to upgrade and search also be a key technical problem that needs to be resolved hurrily.
The urban architecture front image that the present invention utilizes mobile terminal (such as smart mobile phone, PDA etc.) to take, Rapid matching and the corresponding three-dimensional building model of extraction realize that in the mobile terminal three-dimensional scenic of current location is browsed and inquired about.Can at once obtain landmark building three-dimensional model and the peripheral information of user position, but the view of his region is checked in also its position of real-time follow-up of other user.The present invention has a good application prospect in pedestrian navigation, the field such as three-dimensional model search, tourism, military surveillance based on image texture.
Three, summary of the invention
1, purpose: in tourist attractions or strange urban environment, people want better to understand own residing position, near scene or the overall picture of building interested, also in order to allow others share the three-dimensional scenic of his region, the mobile terminal sends to the geographical position coordinates at its place on the server, this location guide server selection user geographic area in the city, landmark around the mobile terminal is taken simultaneously, the three-dimensional building model that is complementary with this picture is searched for or rebuild to server on the internet, the attribute information of three-dimensional building model and correspondence passes to the mobile terminal in real time with the form of compressive flow subsequently, be added on the two-dimensional map relevant position, just can on the mobile terminal, three-dimensional browse and inquire about, as long as other user signs in on the server through mandate, also can check synchronously in mobile terminal separately simultaneously.The present invention can be widely used in the fields such as pedestrian navigation, the three-dimensional model search based on image texture, tourism, military surveillance.
2, technical scheme:
A kind of mobile terminal three-dimensional city model real-time search and synthetic technology of Internet-based is characterized in that, comprise the steps:
According to the information for the treatment of visual building (longitude and latitude, building photo), analyzing web page utilizes Text Mining Technology, extracts the semantic information of corresponding building from destructuring web document, comprises that building classification, block and user are to the evaluation of every building etc.; Utilize web crawlers automatically to download three-dimensional model from the internet based on model space context and geometric shape; If some model contains several buildings, just be divided into single object, with these on a large scale independently model object be organized into 3 d model library, and from the model name, extract text label; Spatial relationship between the shape of given object, label and the object, the degree of strength of existing object Relations Among in predicting candidate model and the scene; Surround a zone of frame given city scene with three-dimensional, return a tabulation of related object after the inquiry; By the matching algorithm of based on the context, select final three-dimensional model, as an object visual (Fig. 1) of scene.
If search on the internet corresponding three-dimensional building model, just be transferred to the mobile terminal through wireless Internet, and show in the Two-dimensional electron map relevant position of mobile terminal; Otherwise the picture according to the mobile terminal is taken continues the associated image of search on the internet, based on image reconstruction and synthetic this city model; Because the image on the network is unordered, and contain a large amount of " periphery " images and scene image and do not share geometric relationship, utilize surperficial clustering algorithm to remove undesirable image, automatic analysis scene arbitrarily angled, constantly, local or whole image, utilize Structure from Motion algorithm to obtain three-dimensional dotted line, identify and cut apart, pick out the spatial correspondence between every image, position according to filming image, the parameter of direction and camera, set up the three-dimensional environment of this scene, then the image reduction of regularization in the three-dimensional environment of having rebuild, realize synthetic (Fig. 2) true to nature of three-dimensional model.
Fig. 3 illustrates the technology of the present invention flow process, and concrete steps are as follows:
(1) out of doors (such as famous tourist attractions, landmark building etc.) in the typical scene, in case the user starts city three-dimensional model function of search at its mobile device that carries (such as smart mobile phone), the geographic position at his place will send on the server, with this Boot Server location and the geographic area of specifying this user.
(2) server with the non-uniform encoding Transfer-matrix of current region to mobile device, simultaneously, online updating word bag (BoW, Bag-of-Words) histogram.In other words, an indicator is served as in the position of mobile device, determines whether to upgrade the compression setting of three-dimensional city model description.
(3) user takes its picture of building interested on every side with smart mobile phone, directly extracts yardstick invariant features conversion described; Subsequent, these local descriptions are quantized into an initial BoW histogram; Subsequently, with the compression of non-uniform encoding matrix coder, generally can generate location recognition feature coding (LDFC) scene description of 15-45 bit, upload onto the server subsequently.
(4) server is decoded into initial BoW histogram to LDFC scene description that receives, then search for the three-dimensional city model that is complementary most with this histogram, if search is less than the three-dimensional model of coupling, then the associated view data of search, based on the synthetic three-dimensional building model of image; At last with three-dimensional model and with it corresponding attribute information pass to the mobile terminal, and this model is added on the corresponding position of Two-dimensional electron map, just can browse and inquire about this three-dimensional city model scene at mobile phone.
(5) other user signs in to server through authorizing by the mobile terminal, can check synchronously above-mentioned three-dimensional scenic.3, advantage and effect: on portable terminal (such as smart mobile phone, PDA), the present invention has realized the technology of a kind of Internet-based intelligent search and synthetic three-dimensional city model.Namely take the front image of interested urban architecture by smart mobile phone, search for the three-dimensional city model from internet intelligent, and three-dimensional model is filtered, remove undesirable data, automatically calculate optimum three-dimensional building model; If search is less than relevant three-dimensional model, then the image data that search matches, based on the image reconstruction three-dimensional model, then with three-dimensional building model and the attribute information of this front image optimum coupling, and return portable terminal, realized the three-dimensional true city of the portable terminals such as smart mobile phone " clap be gained " scene.The user can browse and inquire about own residing city scene and spatial information thereof; Other users also can be at mobile terminal synchronous browsing separately through authorizing.The present invention can realize navigating more accurately and location-based service.
Four, description of drawings
Fig. 1 three-dimensional building pattern search flow process
Fig. 2 is based on the techniqueflow of the synthetic three-dimensional building model of image
The search of Fig. 3 three-dimensional building model and the techniqueflow that synthesizes
The three-dimensional building pattern search of Fig. 4 mobile terminal and synthetic user interface
Fig. 5 smart mobile phone is taken building front picture
Fig. 6 is from the three-dimensional building model of internet coupling
The three-dimensional building model of Fig. 7 the best
Three-dimensional scenic after Fig. 8 mobile terminal is synthetic
Five, embodiment
The present invention relates to a kind of mobile terminal three-dimensional city model real-time search and synthetic technology of Internet-based, the concrete steps of the method are as follows:
According to the information for the treatment of visual building (longitude and latitude, building photo), analyzing web page utilizes Text Mining Technology, extracts the semantic information of corresponding building from destructuring web document, comprises that building classification, block and user are to the evaluation of every building etc.; Utilize web crawlers automatically to download three-dimensional model from the internet based on model space context and geometric shape; If some model contains several buildings, just be divided into single object, with these on a large scale independently model object be organized into 3 d model library, and from the model name, extract text label; Spatial relationship between the shape of given object, label and the object, the degree of strength of existing object Relations Among in predicting candidate model and the scene; Surround a zone of frame given city scene with three-dimensional, return a tabulation of related object after the inquiry; By the matching algorithm of based on the context, select final three-dimensional model, as an object visual (Fig. 1) of scene.
If search on the internet corresponding three-dimensional building model, just be transferred to the mobile terminal through wireless Internet, and show in the Two-dimensional electron map relevant position of mobile terminal; Otherwise the picture according to the mobile terminal is taken continues the associated image of search on the internet, based on image reconstruction and synthetic this city model; Because the image on the network is unordered, and contain a large amount of " periphery " images and scene image and do not share geometric relationship, utilize surperficial clustering algorithm to remove undesirable image, automatic analysis scene arbitrarily angled, constantly, local or whole image, utilize Structure from Motion algorithm to obtain three-dimensional dotted line, identify and cut apart, pick out the spatial correspondence between every image, position according to filming image, the parameter of direction and camera, set up the three-dimensional environment of this scene, then the image reduction of regularization in the three-dimensional environment of having rebuild, realize synthetic (Fig. 2) true to nature of three-dimensional model.
Fig. 3 illustrates the technology of the present invention flow process, and concrete steps are as follows:
(1) out of doors (such as famous tourist attractions, landmark building etc.) in the typical scene, in case the user starts city three-dimensional model function of search at its mobile device that carries (such as smart mobile phone), the geographic position at his place will send on the server, with this Boot Server location and the geographic area of specifying this user.
(2) server with the non-uniform encoding Transfer-matrix of current region to mobile device, simultaneously, online updating word bag (BoW, Bag-of-Words) histogram.In other words, an indicator is served as in the position of mobile device, determines whether to upgrade the compression setting of three-dimensional city model description.
(3) user takes its picture of building interested on every side with smart mobile phone, directly extracts yardstick invariant features conversion described; Subsequent, these local descriptions are quantized into an initial BoW histogram; Subsequently, with the compression of non-uniform encoding matrix coder, generally can generate location recognition feature coding (LDFC) scene description of 15-45 bit, upload onto the server subsequently.
(4) server is decoded into initial BoW histogram to LDFC scene description that receives, then search for the three-dimensional city model that is complementary most with this histogram, if search is less than the three-dimensional model of coupling, then the associated view data of search, based on the synthetic three-dimensional building of image; At last with three-dimensional model and with it corresponding attribute information pass to the mobile terminal, and this model is added on the corresponding position of Two-dimensional electron map, just can browse and inquire about this three-dimensional city model scene at mobile phone.
(5) other user signs in to server through authorizing by the mobile terminal, can check synchronously above-mentioned three-dimensional scenic.
Embodiment 1:
Fig. 4 is system interface of the present invention.The elevation of building image of the shootings such as smart mobile phone and its geographic position are transferred to server after through the LDFC coding, server passes to portable terminal with three-dimensional model or the synthetic model of image of its with it optimum matching that searches on the internet behind the LDFC coding, be added to after the decoding on two-dimensional map or the image, make up more real three-dimensional city scene.
The nearly real-time three-dimensional model that returns of the present invention, period of reservation of number is short, can inquire about and browse three-dimensional scenic.Following examples show achievement of the present invention.
Be that peripheral landmark building atural object takes pictures that (such as World Expo state family school, Fig. 5), extract yardstick invariant features conversion described, these local descriptions are quantized into a BoW histogram with smart mobile phone; Subsequently, compress with the non-uniform encoding matrix coder, on uploading onto the server, server is decoded into initial BoW histogram to LDFC scene description that receives, on the internet search obtains the higher several models (Fig. 6) of matching degree, and three-dimensional model and corresponding attribute information thereof pass to the mobile terminal.The user is according to building at the moment, the rotation three-dimensional model is selected accurately three-dimensional building model (Fig. 7), be superimposed upon the corresponding position of two-dimensional map/image, thus can help the user more accurate, locate really and understand peripheral three-dimensional city scene (Fig. 8).
Claims (1)
1. mobile terminal three-dimensional city model real-time search and the synthetic technology of an Internet-based is characterized in that, comprise the steps:
(1) out of doors (such as famous tourist attractions, landmark building etc.) in the typical scene, in case the user starts city three-dimensional model function of search at its mobile device that carries (such as smart mobile phone), the geographic position at his place will send on the server, with this Boot Server location and the geographic area of specifying this user;
(2) server with the non-uniform encoding Transfer-matrix of current region to mobile device, simultaneously, online updating word bag (BoW, Bag-of-Words) histogram, in other words, an indicator is served as in the position of mobile device, determines whether to upgrade the compression setting of three-dimensional city model description;
(3) user takes its picture of building interested on every side with smart mobile phone, directly extracts yardstick invariant features conversion described; Subsequent, these local descriptions are quantized into an initial BoW histogram; Subsequently, with the compression of non-uniform encoding matrix coder, generate location recognition feature coding (LDFC) scene description, upload onto the server subsequently;
(4) server is decoded into initial BoW histogram to LDFC scene description that receives, then search for the three-dimensional city model that is complementary most with this histogram, if search is less than the three-dimensional model of coupling, then the associated view data of search, based on the synthetic three-dimensional building of image; At last with three-dimensional model and with it corresponding attribute information pass to the mobile terminal, and this model is added on the corresponding position of Two-dimensional electron map, just can browse and inquire about this three-dimensional city model scene at mobile phone;
(5) other user signs in to server through authorizing by the mobile terminal, can check synchronously above-mentioned three-dimensional scenic.
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