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Method for determining altitude in image sequence about building scenes

An image sequence, altitude technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as coordinate axis inconsistency

Inactive Publication Date: 2012-05-09
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to external factors such as terrain fluctuations, the coordinate axes of the calibration coordinate system and the ground coordinate system are inconsistent

Method used

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  • Method for determining altitude in image sequence about building scenes
  • Method for determining altitude in image sequence about building scenes
  • Method for determining altitude in image sequence about building scenes

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Embodiment

[0033] The present invention proposes an efficient and fast method for automatically obtaining the altitude direction in the image sequence from a section of building scene image sequence obtained by shooting in the application of urban modeling, including the following steps:

[0034] First, use the algorithm proposed by Guofeng Zhang et al. in "Robust Metric Reconstruction from Challenging Video Sequences" for a given image sequence to perform automatic camera calibration, obtain the external parameters of the image and all the tracking points used for automatic camera calibration; At the same time, each image in the image sequence is preprocessed to extract the contour of the image; then for each tracking point, find the vertical line segment with the smallest distance from the tracking point on all images corresponding to the tracking point, and then for each All the vertical line segments corresponding to the tracking points are combined in pairs, and the corresponding ver...

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Abstract

The invention discloses a method for determining altitude in an image sequence about building scenes, comprising the flowing steps: firstly, carrying out automatic camera calibration to the image sequence; simultaneously, extracting line sections on edge of images; secondly, for every trace point, finding a vertical line section from the pre-extracting result in a region appearing in automatic trace points; obtaining straight line corresponding to three-dimensional space from the found vertical line sections by utilizing computer visual technology; carrying out clustering to all straight linedirection vector obtained at the same automatic trace point so as to obtain the straight line direction vector of the trace point; and then carrying out clustering to the straight line direction vector of all trace points so as to obtain the altitude direction of the image sequence. Aiming at the defects of the prior art, the invention provides a method for combing with image sequence calibrationinformation to automatically find the altitude direction of the image sequence; and the method has low cost, and can obtain correct altitude direction for most image sequences.

Description

technical field [0001] The present invention relates to a method for automatically determining a direction, in particular to a method for determining an altitude direction from an image sequence about a building scene. Background technique [0002] In the practical application of urban 3D modeling, the way of using digital cameras to collect images at high speed is more and more widely used. This acquisition method uses an image sequence to record the appearance of buildings. A calibration method is usually used to perform 3D reconstruction on this image sequence to restore external parameters such as the shooting position and lens orientation of each image. [0003] While restoring the external parameters of each image, a calibration coordinate system is also introduced. The external parameters such as the shooting position and lens orientation of the image obtained by the calibration method are all located in this calibration coordinate system. However, due to external fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
Inventor 华炜鲍虎军吴智宁何治
Owner ZHEJIANG UNIV