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Method for reconstructing high-dynamic-range imaged flame three-dimensional temperature field

A high dynamic range, three-dimensional temperature technology, applied in the field of virtual reality science, can solve the problems of complex acquisition equipment, difficult to obtain flame images, and excessive simplification of imaging models, so as to simplify the acquisition equipment and improve the calculation accuracy.

Inactive Publication Date: 2015-01-21
BEIHANG UNIV
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Problems solved by technology

[0006] The technical problem solved by the present invention is: Aiming at the problems that the flame image is difficult to obtain, the acquisition equipment is too complicated, and the imaging model is oversimplified in the image-based flame temperature field reconstruction process, a high dynamic range imaging flame three-dimensional temperature field reconstruction method is proposed. Can accurately reproduce the three-dimensional temperature distribution of the flame

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  • Method for reconstructing high-dynamic-range imaged flame three-dimensional temperature field
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  • Method for reconstructing high-dynamic-range imaged flame three-dimensional temperature field

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Step 1 Design the flame acquisition system, place the high dynamic imaging range cameras around the combustion source, and all the cameras form a semicircular shape; the distance from each camera to the flame is equal, all the cameras are placed at the same height, and the angle between the cameras is fixed , the specific value is related to the number of cameras when collecting.

[0027] Step 2 The camera response curve defines the relationship between image brightness and irradiance, and its calibration is realized by exposing the same scene multiple times, assuming that the value of the i-th pixel in the j-th image is p ij , whose exposure time is Δt j , the irradiance corresponding to the pixel value is E i , the relationship among the three can be described as:

[0028] g(p ij ) = ln E i +lnΔt j

[0029] where the exposure time and pixel gray value a...

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Abstract

The invention discloses a method for reconstructing a high-dynamic-range imaged flame three-dimensional temperature field, and belongs to the field of virtual reality. According to the method, a high-dynamic-range collection device is used for obtaining a flame image, and then a photometer and a narrow bandpass filter are utilized for recovering a monochromatic irradiance image; according to the view angle factors and distance, a three-dimensional radiation force field is reconstructed from a two-dimensional irradiance image, the convex optimization is formed, and solution space is restrained through the visual shell technology; finally, a double-color temperature measuring method is used for calculating flame three-dimensional temperature distribution. The flame high-dynamic range color image is utilized for carrying out temperature field reconstruction, and the problem of overexposure of the flame image is solved. The attenuation rate, from a color channel to the monochrome wavelength, of the irradiation is calibrated, multiple monochrome irradiance images can be obtained synchronously, and the reconstruction error caused by directly adopting color channel data is avoided.

Description

technical field [0001] The invention relates to a high dynamic range imaging flame three-dimensional temperature field reconstruction method, which belongs to the field of virtual reality science and technology. Background technique [0002] As a basic element in nature, flame has always been one of the difficulties and focuses in the simulation of natural phenomena because of its translucency and time-varying nature, and it occurs frequently in nature. The flame itself contains a large number of physical effects, which have not even been clearly understood in science, which increases the difficulty of simulating the flame. The simulation and reconstruction of flames is also one of the hotspots and difficulties in computer graphics. The traditional methods mainly include process-based simulation, simulation based on physical equations, etc., and the 3D reconstruction of flames based on real data has emerged in recent years. [0003] Traditional flame simulation methods rare...

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Application Information

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IPC IPC(8): G06T17/00G06T15/00
CPCG06T15/55G06T17/00
Inventor 周忠田德雷伍朝辉吴威
Owner BEIHANG UNIV
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