Real-time searching and combining technology of mobile end three-dimensional city model based on Internet

A city model and three-dimensional model technology, applied in the field of spatial information, can solve the problem of low accuracy and achieve the effect of precise navigation and precise location-based services

Inactive Publication Date: 2013-02-13
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, search engine technology is still limited to text retrieval. The retrieval of images, videos, 3D models, etc. is usually through retrieval of relevant text information, so the accur

Method used

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  • Real-time searching and combining technology of mobile end three-dimensional city model based on Internet
  • Real-time searching and combining technology of mobile end three-dimensional city model based on Internet
  • Real-time searching and combining technology of mobile end three-dimensional city model based on Internet

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Embodiment 1

[0034] Figure 4 is the system interface of the present invention. The building facade image and its geographical location taken by smart phones are encoded by LDFC and then transmitted to the server. The mobile terminal, after decoding, superimposes it on a two-dimensional map or image to construct a more realistic three-dimensional urban scene.

[0035] The invention returns the three-dimensional model in near real time, shortens the user's waiting time, and can inquire and browse the three-dimensional scene. The following examples demonstrate the results of the invention.

[0036] Use your smartphone to take photos of surrounding landmarks (such as the National Pavilion of the World Expo, Figure 5 ), extract scale-invariant feature transformation descriptors, and these local descriptors are quantized into a BoW histogram; then, they are encoded and compressed with a nonlinear coding matrix, uploaded to the server, and the server decodes the received LDFC scene descripto...

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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

1. Technical field [0001] The invention relates to an Internet-based mobile terminal three-dimensional city model real-time search and synthesis technology, which belongs to the field of spatial information technology. 2. Background technology [0002] During the "Eleventh Five-Year Plan" period, my country's navigation and location service applications developed extremely fast. Internet map services began to develop from wired Internet to mobile terminals. Domestic and foreign map products such as Google Maps, Nokia OVI, Tencent QQ Maps, and 51 Maps have all been successful. Transplanted to iOS, Android, Sybian, Windows Mobile and other mobile terminal operating system platforms; entering the "Twelfth Five-Year Plan", the location-based service (LBS) industry facing the public is experiencing map tracking and navigation, life information search, location social The evolution of the network at three levels. "Interactive intelligence, group crowdsourcing, real-time feedback, a...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06T17/00
Inventor 张立强丁雨丝谭欣
Owner BEIJING NORMAL UNIVERSITY
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