Refractive index measurement method of transparent medium based on computer vision
A technology of computer vision and transparent media, which is applied in the measurement of phase influence characteristics, etc., can solve the problems of special optical fiber materials, cumbersome derivation process, and difficult acquisition, and achieve the effect of low price, easy image acquisition process, and automatic realization
Inactive Publication Date: 2017-12-29
WUHAN UNIV OF TECH
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This type of method is mainly applicable to the measurement of the refractive index of liquid or gas, and the derivation process is relatively cumbersome, and the optical fiber material is relatively special, so it is not easy to obtain
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[0029] The present invention will be further described below in conjunction with specific examples and accompanying drawings.
[0030] figure 2 It is a flow chart of the method of the present invention, a method for measuring the refractive index of a transparent medium based on computer vision, comprising the following steps:
[0031] S1. Select a calibration board for calibration: use a camera and a calibration board. The calibration board is located within the range of the image captured by the camera and has a known size; respectively establish the camera coordinate system and the image coordinate system, and establish the relationship between the two coordinate systems.
[0032] In this embodiment, the calibration board is a black and white checkerboard grid (selecting black and white grids can better identify and calculate, avoid denoising the image, and other patterns can also be used), and each grid is a square with a size of 3cm × 3cm (size For better calibration, t...
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The invention provides a method for measuring the refractive index of a transparent medium based on computer vision, using a camera and a calibration plate; establishing a camera coordinate system, an image coordinate system, and the relationship between the two coordinate systems; Under the medium, place the medium to be measured between the calibration plate and the camera again; use the pinhole camera model to calculate the depth information of the corner point in the camera coordinate system, the angle between the back projection ray and the optical axis corresponding to the corner point, The position change of the corner point in the two images; measure the thickness of the medium to be measured, and derive the calculation formula of the refractive index of the medium to be measured according to the pinhole imaging model and Snell's law of refraction, and substitute the calculated parameters into the medium to be measured the refractive index. The invention can realize the measurement of the refractive index of the object only by acquiring two images of the calibration plate by the camera, greatly simplifies the calculation process, simplifies the measurement steps, reduces the measurement cost, and has high calculation accuracy.
Description
technical field [0001] The invention relates to the fields of computer vision image data processing, camera model, three-dimensional reconstruction and optical measurement, in particular to a method for measuring the refractive index of a transparent medium based on computer vision. Background technique [0002] The ratio of the propagation speed of light in other media to the propagation speed in vacuum is called the refractive index. The phenomenon of refraction is ubiquitous in our daily life. At the same time, the phenomenon of refraction has an important impact on the research of computer vision, optical imaging, medicine and other fields. However, in practice, some objects cannot obtain accurate refractive indices because they are made of unknown materials or contain impurities. Therefore, it is of great significance to quickly and accurately calculate the refractive index of transparent objects. [0003] At present, the measurement methods of the refractive index are...
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IPC IPC(8): G01N21/41
Inventor 胡钊政李祎承胡月志李京
Owner WUHAN UNIV OF TECH