A Method for Obtaining Spectral Reflectance Ratio Using Dual Light Source Response Values of Multispectral Camera
A technology of spectral reflectance and response value, applied in spectrometry/spectrophotometry/monochromator, optical radiation measurement, spectrum investigation, etc., can solve the problems of increasing operational complexity and multi-spectral image acquisition time, and achieve increased The effect of channel response value information, improving acquisition accuracy, and reducing complexity
Active Publication Date: 2017-12-15
ZHEJIANG UNIV
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Problems solved by technology
Utilizing the channel response values of target samples under two light sources can significantly increase the number of target sample channel response values, but actual shooting under two light sources will increase operational complexity and multispectral image acquisition time, such as under another light source Need to readjust the exposure time of each channel, focus on each channel, registration between multi-channel images, etc.
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[0024] Taking a color filter wheel-type multi-spectral camera as an example, the method of obtaining the spectral reflectance of the object surface by using the response value of the multi-spectral camera's dual light sources is explained. The structural diagram of the multi-spectral camera is as follows: figure 2 , consisting of lens, filter wheel, filter wheel control unit and monochrome CCD sensor. The multispectral camera utilizes 8 interference filters to form 8 channels. The peak transmittance wavelengths of the 8 color filters are from 420nm to 700nm, and the FWHM (Full Width of Half Maximum) is 20nm, so the peak transmittance wavelengths corresponding to the 8 channels are 420nm, 460nm, 500nm , 540nm, 580nm, 620nm, 660nm, 700nm. It should be noted that the present invention is not limited to the multispectral camera of color filter wheel type, and is also applicable to multispectral cameras of other forms, such as multispectral cameras based on LCTF (Liquid Crystal T...
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The invention discloses a method for acquiring a spectral reflectance ratio through the dual light source response values of a multispectral camera. High-precision color measurement can be achieved by acquiring the spectral reflectance ratio of an object, and the color of the object in any light source can be truly reproduced. The method comprises the steps that firstly, a function relationship between the response values of each channel of the multispectral camera in two light sources is established through a training sample; then, a target sample is shot in one light source, all channel response values in the other light source are calculated through the channel response value function relationship established before and all the channel response values in the light source, and therefore the spectral reflectance ratio of the surface of the object is acquired through the multichannel response values in the two light sources. Available response value information of the target sample is remarkably increased, the acquiring precision of the spectral reflectance ratio is improved, the target sample does not need to be actually shot in the other light source, operation is simplified, and efficiency is improved.
Description
technical field [0001] The invention relates to a method for imaging the surface spectrum and chromaticity information of an object, in particular to a method for obtaining the reflection spectrum information of an object by using a multi-spectral camera with multiple visible light band channels to further obtain the chromaticity information of the object. Background technique [0002] Due to the existence of metamerism, the chromaticity parameters of the object are difficult to reliably represent the original information of the object surface, while the spectral reflectance of the object surface is a physical quantity that is independent of the device and the capture light source, and represents the original information of the object surface, so accurate acquisition The spectral reflectance of an object can faithfully reproduce the color appearance of an object under any light source. [0003] Imaging acquisition of object spectral reflectance can overcome the defects of sp...
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IPC IPC(8): G01J3/28
CPCG01J3/2823G01J2003/2826
Inventor 徐海松徐鹏
Owner ZHEJIANG UNIV