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A method and system for point-to-point white reference correction of hyperspectral images
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A hyperspectral image and hyperspectral technology, applied in the field of hyperspectral analysis, can solve problems such as not considering errors
Active Publication Date: 2022-03-18
SHEN ZHEN HYPERNANO OPTICS TECH CO LTD
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The hyperspectral data of the sample and the hyperspectral data of the whiteboard are divided by matrix points to obtain the reflectance REFL(x,y,w) of the sample; this method only needs to be shot once, and the process is simple, but the default hyperspectral image dimension is each pixel point , the shape of the light source spectrum is the same, without considering the error caused by the inhomogeneity of the light source, camera imaging chip, ambient light, etc.
[0008] At present, the industry still lacks a simple and accurate point-to-point white ginseng correction method for each pixel of the hyperspectrum
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specific Embodiment 1
[0093] 1) Specific embodiment 1: use the method described in the present invention to detect jewelry.
[0094] Figure 4 It shows a hardware construction diagram for using hyperspectral imaging technology to detect jewelry according to a specific embodiment of the present invention, and Figure 5 A flowchart of this embodiment is shown.
[0095] Such as Figure 4 It can be seen that the hardware construction includes: hyperspectral camera 401; light source 402; jewelry detection black box 403; sample placement table 404; quartz glass 405; door switch shaft 406;
[0096] Its characteristics are:
[0097] The visible range of the hyperspectral camera 401 is just the size of the sample placement table 404;
[0098] All sides of the jewelry testing black box 403 are sealed and made of black material;
[0099] For the detailed structure of the sample placement table 404 and the quartz glass 405, refer to the glass protection scheme of the whiteboard, where the area protected b...
specific Embodiment 2
[0111] 2) Specific embodiment 2: use the method described in the present invention to measure the gemstone color.
[0112] Figure 7 A flow chart showing a specific embodiment of the present invention utilizing hyperspectral imaging technology to measure gemstone color, the specific steps are as follows:
[0113] There is an initial reference area A1, judge whether the reference area A1 is blocked by the sample based on the hyperspectral data of the sample, if not, confirm that the reference area A1 is valid, and calculate the whiteboard in this area (can also be pre-calculated) and The average spectrum of the sample W A1 (w) and S A1 (w), and get the white ginseng correction coefficient alpha(w)=W A1 (w) / S A1 (w);
[0114] Such as occlusion, read the pure whiteboard hyperspectral data white(x,y,w) in the memory, reselect the new reference area A2, and calculate the white ginseng correction coefficient alpha=W based on the reference area A2 A2 (w) / S A2 (w...
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Abstract
The present invention provides a method and system for performing point-to-point white reference calibration on hyperspectral images, including pre-photographing hyperspectral data white (x, y, w) of a standard reference whiteboard, and storing and recording; Spectral data sample(x,y,w); select a small unoccluded whiteboard area in the sample hyperspectral data sample(x,y,w), and record it as area A; calculate the ROI area on the sample image The average value of the spectrum of the white ginseng to obtain SA(w); and calculate the average spectrum in the same ROI area in the whiteboard data to obtain WA(w); divide the two to obtain the correction coefficient alpha(w); the white ginseng correction coefficient alpha( w) multiplied by the white reference corrected sample reflectance image matrix to obtain the final hyperspectral reflectance image matrix. The present invention does not need to collect the whiteboard spectrum separately, reduces the data collection time, increases the analysis efficiency, and can effectively improve the accuracy of the hyperspectral analysis; moreover, the white ginseng correction is performed using the data taken at the same time, which greatly increases the reliability and accuracy of the measurement. repeatability.
Description
technical field [0001] The invention relates to the technical field of hyperspectral analysis, in particular to a method and system for performing point-to-point white reference correction on hyperspectral images. Background technique [0002] Hyperspectral imaging technology can obtain image information and spectral information at the same time. In the image dimension, it can be combined with machine vision technology to distinguish object images. In the spectral dimension, it can also analyze material components. It is a new technology with great potential. The spectral analysis capability of hyperspectral imaging technology comes from the fact that the spectrum can record the spectral information obtained by the interaction of light and matter at different wavelengths, and the spectral information corresponds to the physical and chemical composition of objects. [0003] Description of the interaction process between light and matter: when the incident light hits the mater...
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