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Method for carrying out water-surface data acquisition and reconstruction by using multiple cameras

A data acquisition and camera technology, applied in image data processing, instruments, calculations, etc., can solve problems such as difficult to obtain ideal results, achieve the effect of light weight and easy operation, increase robustness and reliability

Inactive Publication Date: 2013-01-30
BEIHANG UNIV
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Problems solved by technology

This method has great limitations. It can only be used to solve approximately flat surfaces. It is difficult to obtain ideal results for surfaces that change dynamically over time, such as water ripples.

Method used

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  • Method for carrying out water-surface data acquisition and reconstruction by using multiple cameras
  • Method for carrying out water-surface data acquisition and reconstruction by using multiple cameras
  • Method for carrying out water-surface data acquisition and reconstruction by using multiple cameras

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Embodiment Construction

[0025] Such as figure 1 As shown, the present invention includes the process of building an acquisition system and solving the water surface depth and normal vector information from the fixed marker image sequence captured by multiple calibrated cameras.

[0026] 1. The design of the marker board (black and white checkerboard), the steps are: since the checkerboard will be placed underwater, it should be flat and waterproof, and the refraction of water and air will lead to unreliable color in the imaging Therefore, black and white markers should be used instead of color markers; in order to ensure the recognizability of the spatial positions of markers in different cameras, the number of vertical and horizontal corners of the marker board should be designed to be odd and even or vice versa. Use each grid with a side length of 1cm, a total of 25*40 grids. When in use, spread the checkerboard on the bottom of the tank. The checkerboard should be flat and in direct contact with ...

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Abstract

The invention discloses a method for carrying out water-surface data acquisition and reconstruction by using multiple cameras, which comprises the following steps: (1) building an acquisition system, placing a black-and-white checkerboard below a water surface to be acquired, and synchronously carrying out photographing acquisition at different viewing angles by using two calibrated high-speed cameras; (2) obtaining a pixel mapping relation in multiple views, calculating and obtaining an angular point-angular point mapping relation in each view by using a Harris angular point detection method, and then obtaining a pixel-by-pixel mapping relation by using a bilinear interpolation; and according to the known plane space of the checkerboard, determining a mapping relation between each pixel space and a physical space; and (3) because each pixel can obtain a set of possible light propagation paths and refraction points in the paths according to the physical characteristics of optical propagation, and the refraction points corresponding to corresponding pixels under different views must be the same, finding coincident refraction points, namely, finding points on the water surface, from the path set of all pixel pairs, and calculating the three-dimensional coordinates and corresponding normal vectors of the points, thereby obtaining a reconstruction result of the water surface.

Description

technical field [0001] The present invention belongs to the technical field of computer virtual reality, and in particular relates to the design and construction of an easy-to-use water surface data acquisition system. According to the collected data, combined with the light propagation characteristics, the water surface information is solved. The method can be used for physical data acquisition and reconstruction of general water surfaces . Background technique [0002] In recent years, the reconstruction of liquid surfaces that change dynamically over time has gradually become a hot topic in many research fields. Although the computer simulation of liquids has made great progress, and simulated liquids that are more in line with physical laws and have more realistic visual effects have appeared, it is still a challenging problem to obtain the physical properties of real liquids that change over time through collection methods. [0003] Many research methods use the physic...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 齐越邹玲王庆兴
Owner BEIHANG UNIV
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