CN111579502A - Method for judging rock core imaging spectrum scanning quality - Google Patents
Method for judging rock core imaging spectrum scanning quality Download PDFInfo
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- CN111579502A CN111579502A CN202010471520.6A CN202010471520A CN111579502A CN 111579502 A CN111579502 A CN 111579502A CN 202010471520 A CN202010471520 A CN 202010471520A CN 111579502 A CN111579502 A CN 111579502A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 35
- 238000001228 spectrum Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000011435 rock Substances 0.000 title claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 51
- 230000003595 spectral effect Effects 0.000 claims abstract description 33
- 238000007689 inspection Methods 0.000 claims abstract description 9
- 238000002310 reflectometry Methods 0.000 claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 208000035126 Facies Diseases 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/13—Standards, constitution
Abstract
The invention belongs to the field of hyperspectral core scanning, and particularly discloses a method for judging core imaging spectrum scanning quality, which comprises the following steps: placing a standard white board on a scanning path of an imaging spectrum scanner; placing a standard substance on a scanning path of an imaging spectrometer; carrying out rock core scanning work by using an imaging spectrum scanner to ensure that a standard white board and a standard substance can be collected in each scanning; calculating the reflectivity by using a standard white board; the data quality was checked using standard substances. The invention only needs to put the standard substance on the scanning path, and the operation steps are simple; the invention can complete the inspection once per scanning, and has high inspection efficiency; the same standard substance is used for the same batch of scanning, the detection repeatability is good, and the spatial resolution and the spectral resolution can be checked at the same time.
Description
Technical Field
The invention belongs to the field of hyperspectral core scanning, and particularly discloses a method for judging core imaging spectrum scanning quality.
Background
The hyperspectral rock core scanning and data processing belongs to mineral geology, remote sensing and informatization integrated technology, is an important technical means for mastering deep geological information, discussing deep mineral-forming environment, realizing digitization of a real rock core and developing prediction and evaluation of deep mineral, has important application in the aspects of oil gas, ferrous metal, nonferrous metal, rare metal and nonmetal mineral exploration, deep mineral-forming environment analysis and the like, and is also an important technology for converting the rock core into a digital rock core and realizing permanent preservation of the rock core.
At present, the hyperspectral rock core scanning technology only focuses on data acquisition and information extraction, and a unified standard is lacked in the aspect of data quality inspection. In such a case, the researcher only roughly evaluates the data quality based on whether the image itself is blurred, whether there are bad tracks, bright spots, and whether the spectrum has jagged noise. The method has high randomness, different researchers may have different recognitions due to respective reasons, so that the standards for evaluating the data quality are inconsistent, and the result contrast is poor. Due to the fact that hyperspectral core scanning has the characteristics of ' atlas and ' one ', comprehensive evaluation needs to be conducted on data quality from the two aspects of image quality and spectral quality. The spatial resolution of the image is mainly examined in terms of the image, the position of the absorption peak and the degree of spectral accuracy are mainly examined in terms of the spectrum.
Therefore, a method for judging the core imaging spectrum scanning quality needs to be designed to solve the defects of the prior art.
Disclosure of Invention
The invention aims to provide a method for judging the scanning quality of a rock core imaging spectrum aiming at the defects of the prior art, the method for placing standard substances is utilized, a scanning device is utilized to obtain a hyperspectral image, and meanwhile, the quality of the obtained hyperspectral image is checked from two angles of image and spectrum.
The technical scheme of the invention is as follows:
a method for judging core imaging spectrum scanning quality comprises the following steps:
step (1) placing a standard white board on a scanning path of an imaging spectrum scanner;
placing a standard substance on a scanning path of an imaging spectrometer according to working requirements;
step (3) carrying out rock core scanning work by using an imaging spectrum scanner, and ensuring that a standard white board and standard substances can be collected in each scanning;
step (4) calculating the reflectivity by using a standard white board;
and (5) checking the data quality by using a standard substance.
The standard substance in the step (2) is a mineral or other material with known size, known volume and fixed spectral characteristics and stable properties.
And (3) reasonably selecting the quantity of the standard substance according to different requirements on spatial resolution and spectral characteristics in the step (2).
When the standard substance is selected in the step (2), whether the selected standard substance can correctly reflect the specific spatial resolution and spectral resolution or not needs to be comprehensively considered, and if the standard substance cannot reflect the specific spatial resolution and spectral resolution, the standard substance needs to be replaced.
And (4) calculating by using data processing software and combining the reflectance curve of the standard white board to obtain a reflectance image of the hyperspectral data of the rock core.
And (5) using the standard substance to check the data quality to be divided into a spatial characteristic check and a spectral characteristic check.
The spatial feature check in the step (5) is to check whether the resolution of the image is sufficient, whether the edges of the standard substance are clear, and the like, mainly according to the specific shape and size of the standard substance.
In the step (5), the spectrum characteristic inspection of whether the actually measured spectrum of the main inspection standard substance is consistent with the theoretical spectrum curve or not comprises the following steps: whether the overall shapes of the curves are consistent, whether the positions of key absorption peaks are consistent, whether the absorption depths are consistent and the like.
And (5) if the image spatial resolution is enough, the standard substance has clear outline, and the integral shape, the key absorption peak position and the absorption depth of the spectral curve are consistent with the theoretical spectral curve, the data quality is considered to be good, otherwise, the data quality is considered to be not good.
The invention has the following beneficial effects:
(1) the invention only needs to put the standard substance on the scanning path, and the operation steps are simple;
(2) the invention can complete the inspection once per scanning, and has high inspection efficiency;
(3) the same standard substance is used for the same batch of scanning, and the test repeatability is good.
(4) Since both the size and the spectrum of the standard substance are known, both a check of the spectral resolution and the spatial resolution can be achieved.
Detailed Description
The present technology is further described below:
the invention provides a method for judging core imaging spectrum scanning quality, which comprises the following steps:
the method comprises the following steps that (1) a standard white board is placed on a scanning path or in a visual field of an imaging spectrum scanner;
erecting a push-scanning type or frame-type imaging spectrum scanner, and placing a standard diffuse reflection white board on a scanning path or in a visual field;
placing a standard substance on a scanning path or in a visual field of an imaging spectrometer;
placing a stable quality mineral or other material of known size, volume, and spectral characteristics as a standard substance in a scan path or field of view of an imaging spectrometer;
the number of the standard substances is 1, 2 or more, and the standard substances are reasonably selected according to different requirements on spatial resolution and spectral characteristics;
when the standard substance is selected, whether the selected standard substance can correctly reflect the specific spatial resolution and spectral resolution or not needs to be comprehensively considered, and if the standard substance cannot reflect the specific spatial resolution and spectral resolution, the standard substance needs to be replaced;
step (3) carrying out rock core scanning work by using an imaging spectrum scanner, and ensuring that a standard white board and standard substances can be collected in each scanning;
starting an imaging spectrum scanner, controlling the movement of the imaging spectrum scanner by using a control system, and collecting imaging spectrum data of the rock core;
step (4) calculating the reflectivity by using a standard white board;
calculating to obtain a reflectivity image of the core hyperspectral data by using the empirical line function of data processing software such as ENVI and the like in combination with the reflectivity curve of the standard white board;
and (5) checking the data quality by using a standard substance.
Checking the shape and size of the standard substance by using the view function of the ENVI software, and judging whether the resolution of the image is sufficient, the edge of the standard substance is clear, and the like; the method for checking the spectrum of the standard substance by utilizing the spectrum display function of ENVI and judging whether the actually measured spectrum is consistent with a theoretical spectrum curve (determined by long-term observation) comprises the following steps: whether the overall shapes of the curves are consistent, whether the positions of key absorption peaks are consistent, whether the absorption depths are consistent and the like; if the image spatial resolution is enough, the standard substance has clear outline, the integral shape, the key absorption peak position and the absorption depth of the spectral curve are consistent with the theoretical spectral curve, the data quality is considered to be good, otherwise, the data quality is considered to be not good.
The technical method is used by researchers when carrying out core imaging spectral data acquisition in a certain area of the facies mountains in the west and the river. When data of each box of rock core is acquired, the quality of the acquired image is checked, high-quality rock core hyperspectral data are finally obtained, and a foundation is laid for information identification and extraction in the later period.
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (9)
1. A method for judging rock core imaging spectrum scanning quality is characterized by comprising the following steps: the method comprises the following steps:
step (1) placing a standard white board on a scanning path of an imaging spectrum scanner;
placing a standard substance on a scanning path of an imaging spectrometer according to working requirements;
step (3) carrying out rock core scanning work by using an imaging spectrum scanner, and ensuring that a standard white board and standard substances can be collected in each scanning;
step (4) calculating the reflectivity by using a standard white board;
and (5) checking the data quality by using a standard substance.
2. The method for judging the spectral scanning quality of core imaging according to claim 1, wherein the method comprises the following steps: the standard substance in the step (2) is a mineral or other material with known size, known volume and fixed spectral characteristics and stable properties.
3. The method for judging the spectral scanning quality of core imaging according to claim 2, wherein the method comprises the following steps: and (3) reasonably selecting the quantity of the standard substance according to different requirements on spatial resolution and spectral characteristics in the step (2).
4. The method for judging the spectral scanning quality of core imaging according to claim 3, wherein the method comprises the following steps: when the standard substance is selected in the step (2), whether the selected standard substance can correctly reflect the specific spatial resolution and spectral resolution or not needs to be comprehensively considered, and if the standard substance cannot reflect the specific spatial resolution and spectral resolution, the standard substance needs to be replaced.
5. The method for judging the spectral scanning quality of core imaging according to claim 4, wherein the method comprises the following steps: and (4) calculating by using data processing software and combining the reflectance curve of the standard white board to obtain a reflectance image of the hyperspectral data of the rock core.
6. The method for judging the spectral scanning quality of core imaging according to claim 5, wherein the method comprises the following steps: and (5) using the standard substance to check the data quality to be divided into a spatial characteristic check and a spectral characteristic check.
7. The method for judging the spectral scanning quality of core imaging according to claim 6, wherein the method comprises the following steps: the spatial feature check in the step (5) is to check whether the resolution of the image is sufficient, whether the edges of the standard substance are clear, and the like, mainly according to the specific shape and size of the standard substance.
8. The method for judging the spectral scanning quality of core imaging according to claim 7, wherein the method comprises the following steps: in the step (5), the spectrum characteristic inspection of whether the actually measured spectrum of the main inspection standard substance is consistent with the theoretical spectrum curve or not comprises the following steps: whether the overall shapes of the curves are consistent, whether the positions of key absorption peaks are consistent, whether the absorption depths are consistent and the like.
9. The method for judging the spectral scanning quality of core imaging according to claim 8, wherein the method comprises the following steps: and (5) if the image spatial resolution is enough, the standard substance has clear outline, and the integral shape, the key absorption peak position and the absorption depth of the spectral curve are consistent with the theoretical spectral curve, the data quality is considered to be good, otherwise, the data quality is considered to be not good.
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| CN202010471520.6A CN111579502A (en) | 2020-05-29 | 2020-05-29 | Method for judging rock core imaging spectrum scanning quality |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112699756A (en) * | 2020-12-24 | 2021-04-23 | 中国农业科学院农业信息研究所 | Hyperspectral image-based tea origin identification method and system |
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2020
- 2020-05-29 CN CN202010471520.6A patent/CN111579502A/en active Pending
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Application publication date: 20200825 |