CN114563361A - Spectrum monitoring cultural relic anti-theft method and system based on hyperspectral camera - Google Patents
Spectrum monitoring cultural relic anti-theft method and system based on hyperspectral camera Download PDFInfo
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Abstract
The invention discloses a method and a system for preventing a cultural relic from being stolen based on spectral monitoring of a hyperspectral camera, wherein firstly, a hyperspectral image of the cultural relic to be monitored is collected through the hyperspectral camera; determining the position of a coded label on the cultural relic to be monitored; determining the spectral characteristics of the cultural relic to be monitored at the position of the coding label; acquiring the characteristics of the coding label in the hyperspectral image according to the spectral characteristics; and determining the state information of the cultural relic to be monitored according to the characteristics of the coded label. According to the hyperspectral monitoring method, the labels with different specific spectrums are placed at different parts of the cultural relic, the hyperspectral camera and the computer are used for realizing real-time monitoring and coding of the cultural relic, when the specific spectrums of the labels can be detected, the cultural relic is considered not to be stolen, when the specific spectrums of the labels at the certain parts cannot be detected, the part of the cultural relic is considered to have the risk of being stolen, and the method is high in monitoring accuracy of the cultural relic.
Description
Technical Field
The invention relates to the technical field of cultural relic monitoring, in particular to a method and a system for preventing the cultural relic from being stolen based on spectral monitoring of a hyperspectral camera.
Background
At present, the work of protecting cultural relics is more and more important, the condition of protecting the cultural relics in China is not optimistic at present, a plurality of cultural relics such as stone images, wall paintings and the like are damaged partially, and once the cultural relics are damaged, the cultural relics are difficult to repair completely, so that the research of a cultural relic protection method capable of distinguishing different parts of the cultural relics and monitoring the cultural relics is very important.
At present, with the continuous development of science and technology, the monitoring method for cultural relic protection is more diversified, and new monitoring methods are developed in a large number. At present, various monitoring methods for cultural relic protection are available, and various methods have advantages and disadvantages, such as a distance measurement method, a vibration measurement method, a video monitoring method and the like. For example, the patent with the application number of CN201610419995.4 discloses a built-in passive monitoring cultural relic capsule box and a manufacturing method thereof, the cultural relic capsule box is manufactured through a built-in passive monitoring module, a transparent observation window is arranged at a mounting hole of a box body in an embedded mode, the temperature and the humidity in the capsule box are obtained through the monitoring module, and the condition that whether the cultural relic is stolen or not cannot be monitored can not be realized. For another example, the patent application number is CN201320618637.8, the patent name is a wireless off-position alarm system based on RFID, and the RFID tag is used to alarm the leaving of the cultural relic, but the tag is arranged on the base of the cultural relic and is not arranged on the cultural relic itself, so that the cultural relic cannot be found in time even if stolen, and potential safety hazards exist.
Disclosure of Invention
In view of the above, the present invention provides a method for preventing theft of a cultural relic through spectrum monitoring based on a hyperspectral camera, in which a hyperspectral camera is used to acquire a frequency spectrum signal of a cultural relic tag, and the identification and monitoring are performed according to different frequency spectrum characteristics.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a hyperspectral camera-based spectrum monitoring cultural relic anti-theft method, which comprises the following steps of:
collecting a hyperspectral image of a cultural relic to be monitored by a hyperspectral camera;
determining the position of a coded label on the cultural relic to be monitored;
determining the spectral characteristics of the cultural relic to be monitored at the position of the coding label;
acquiring the characteristics of the coding label in the hyperspectral image according to the spectral characteristics;
and determining the state information of the cultural relic to be monitored according to the characteristics of the coded label.
Furthermore, the coded label comprises codes marked by a plurality of preset spectrum materials according to a preset sequence, and the preset spectrum materials are reflecting materials which are transparent to visible light and have characteristic peak positions in preset wave bands.
Further, the code label is arranged at a preset position of the cultural relic to be monitored.
Further, the state information of the cultural relic to be monitored is judged according to the decoding, and the method comprises the following steps:
and judging whether the characteristic peak of the coded tag of the cultural relic to be monitored changes or not according to the decoding, if not, judging that the cultural relic to be monitored is not damaged or stolen, and if so, judging that the cultural relic to be monitored is damaged or stolen.
Further, the characteristics of the coded label are extracted according to the following steps:
preprocessing the frequency spectrum image, calculating the gray value difference between the coding label and the background image of the cultural relic to be monitored, judging whether the gray value difference exceeds a preset threshold value, if so, determining that the coding label has a characteristic peak position, and if not, determining that the coding label does not have the characteristic peak position.
Further, the characteristic peak position of the coded label is determined according to the following steps:
the method comprises the steps of collecting hyperspectral data of a cultural relic body to be monitored, obtaining a spectral curve of each part of the cultural relic to be monitored according to the hyperspectral data, determining a characteristic peak position according to the spectral curve, and determining a coding label of the cultural relic to be monitored according to the characteristic peak position.
Further, the coded labels are combined in the following manner:
selecting a corresponding frequency spectrum material according to the characteristic peak position and manufacturing a corresponding characteristic peak position film device; the film devices with different characteristic peak positions are coded and spliced according to a preset sequence, the characteristic peak is marked as 1 in one wave band, the characteristic peak is not marked as 0, and N characteristic peaks are marked as 2NA code combination is adopted, wherein all 0 s represent no characteristic peak in each wave band, represent the cultural relics, and the rest are 2N1 kinds of characteristic peak code combination can be used as 2N1 tag number, 2 for cultural relicsN-1 site.
Further, the method also comprises the following steps of calibrating the image of the hyperspectral image, wherein the specific process is as follows:
setting a hyperspectral camera acquisition condition and scanning a standard white correction plate to obtain a full-white calibration image W;
closing a camera shutter to acquire an image to obtain a completely black calibration image B;
the calibration is carried out according to the following formula:
where I denotes an absolute image and R denotes a relative image.
The invention provides a hyperspectral camera-based spectrum monitoring cultural relic anti-theft system, which comprises a hyperspectral camera, a control unit and a data processing device, wherein the hyperspectral camera is connected with the control unit;
the control unit is connected with the hyperspectral camera and the data processing device; the control unit is used for controlling the hyperspectral camera;
the hyperspectral camera is used for shooting images of the cultural relics to be monitored, which are provided with the coded labels, and transmitting the shot images to the data processing device; the data processing device is used for analyzing the image and identifying the characteristics in the coded label.
Further, the data processing apparatus includes the following sections:
the tag positioning unit is used for determining the position of a coded tag on the cultural relic to be monitored;
the cultural relic spectral feature determining unit is used for determining the spectral feature of the cultural relic to be monitored at the position of the coding label;
the hyperspectral camera control unit is used for acquiring a spectrum image of the coding label under the optical filter through a camera;
the characteristic peak extraction unit is used for transmitting the frequency spectrum image to the data processing device for processing to obtain a characteristic peak position of the coding label;
the decoding unit is used for acquiring the decoding of the coded label according to the characteristic peak position;
and the judging unit is used for judging the state information of the cultural relic to be monitored according to the decoding.
The invention has the beneficial effects that:
the hyperspectral monitoring method provided by the invention has the advantages that the labels with different specific spectrums are placed at different parts of the cultural relic, the hyperspectral camera and the computer are used for realizing real-time monitoring and coding of the cultural relic, the cultural relic is considered not to be stolen when the specific spectrums of the labels can be detected, and the part of the cultural relic is considered to have the risk of being stolen when the specific spectrums of the labels at certain parts cannot be detected, and the method is not reported.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is a schematic diagram of a hyperspectral cultural relic anti-theft protection system based on tag coding.
FIG. 2 is a flow chart of a hyperspectral cultural relic anti-theft protection system based on tag coding.
Fig. 3 is a calcium carbonate infrared absorption spectrum.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Example 1
The spectrum monitoring cultural relic anti-theft method based on the hyperspectral camera overcomes the defects and shortcomings in the prior art, the specific spectrum of the spectrum device is identified through the hyperspectral camera, and the hyperspectral image is a three-dimensional image block consisting of optical images at a series of wavelengths in a specific wavelength range. x and y denote two-dimensional plane coordinate axes, and λ denotes a wavelength information coordinate axis. The hyperspectral image has both image information at a certain specific wavelength λ i and spectral information at different wavelengths for a certain specific pixel in the xy plane.
Therefore, the hyperspectral image integrates the image and the spectral information, the image information can reflect the external quality characteristics of the sample such as size, shape, defect and the like, the image can obviously reflect a certain defect under a certain specific wavelength due to different components which have different spectral absorption, and the spectral information can fully reflect the difference of the internal physical structure and chemical components of the sample; a multilayer film material is used as a spectrum enhancing material of a nondestructive marker, and a multilayer film spectrum device which is transparent in visible light and has characteristic peak positions in other wave bands is designed to be attached to the surface of the cultural relic to be protected. When a part of a cultural relic is stolen or the surface of a frequency spectrum device is damaged, the characteristic peak of the frequency spectrum device with the multilayer film structure disappears or changes, and the change can be detected after the computer processes a hyperspectral image, so that the purposes of monitoring and preventing the cultural relic are achieved, and the method specifically comprises the following steps:
firstly, a hyperspectral image system is utilized to collect the body spectrum of each cultural relic, the optimal characteristic peak wavelength position of a spectrum device is searched, a multilayer film material is used as a spectrum enhancement material of a lossless mark, the multilayer film spectrum device which is transparent in visible light and has characteristic peak positions at other wave bands is designed to be attached to the surface of the cultural relic to be protected, and the multilayer film device is provided with a plurality of different characteristic peaks and is used for special spectrum coding. The method comprises the steps of coding a specific cultural relic by using a frequency spectrum device, recording the code, then collecting specific spectrum peak position distribution of a multilayer film frequency spectrum device in real time by using a hyperspectral camera, identifying a film system combination used for coding after image calibration, reversely solving specific cultural relic frequency spectrum coding identification, realizing accurate identification of different cultural relic components, sending an alarm if the code changes when a characteristic peak changes or is missing, and providing technical support for tracking, identifying and tracing the cultural relic components.
The method for identifying the characteristic peak position of the spectrum device based on the hyperspectral camera is characterized by comprising the following steps of:
1) and collecting hyperspectral data of the cultural relic body. The hyperspectral image system is used for collecting spectral curves of all parts of the cultural relic, acquiring spectral data of all cultural relics to be monitored, and searching the optimal characteristic peak wavelength position of a frequency spectrum device, namely the wavelength position where the characteristic peak of the frequency spectrum device can be obviously distinguished from the spectrum of the cultural relic body.
2) Designing and preparing multi-section spectrum materials and devices. A multilayer film device which is transparent in visible light and has characteristic peak positions (N total characteristic peak positions) in other wave bands is designed to be attached to the surface of the cultural relic to be protected, each frequency spectrum device generates N (N is more than 0 and less than or equal to N) characteristic peaks, and the N characteristic peaks are in different wave bands. In addition to obvious difference in spectrum requirements, attention needs to be paid to ensuring physical stability of the material, harmlessness to cultural relics and the like when preparing the spectrum material, and influence on the cultural relics is ensured to be as small as possible.
3) And (5) encoding the member. The film devices with different characteristic peaks are coded and spliced as required, the characteristic peak existing in one wave band is marked as 1, the characteristic peak not existing is marked as 0, and N characteristic peaks have 2NA code combination, wherein all 0 s represent no characteristic peak in each wave band, represent the cultural relic per se, and the rest are 2N1 kinds of characteristic peak code combination can be used as 2N-1 specific tag number, 2 for cultural relicsN-1 position.
4) And (5) image acquisition. Before the hyperspectral image data are collected, the exposure time of a hyperspectral camera is determined in advance to ensure that the image is clear; determining the speed of the conveyor to avoid distortion of image size and spatial resolution; during data acquisition, a detector of the linear array transversely scans (in the x-axis direction) in the vertical direction of an optical focal plane to acquire image information of each pixel in a strip-shaped space at each wavelength; meanwhile, as the cultural relic advances (in the y-axis direction), the linear array detector sweeps out the whole plane to complete the acquisition of the whole image data, and a hyperspectral image of the cultural relic is obtained.
5) And (5) image calibration. Due to the uneven distribution of the intensity of the light source in each wave band and the existence of dark current noise in the camera, the obtained image contains large noise in the wave band with weak intensity distribution of the light source, so that the obtained hyperspectral image needs to be calibrated. Under the same system conditions as the sample collection, a standard white calibration plate is first scanned to obtain a full white calibration image W. And then closing a shutter of the camera to acquire an image to obtain a completely black calibration image B. And finally, finishing image calibration to change the acquired absolute image I into a relative image R, wherein the calibration formula is as follows:
6) software processing and alarming. And transmitting the obtained hyperspectral image to a computer terminal for processing, and inversely solving a corresponding component code according to the gray level difference between the spectrum device in each band photo and the background of the cultural relic and the difference between the spectrum curve of the obtained spectrum device and the spectrum curve of the cultural relic body. When the code of a specific component is found to be changed or disappear, the cultural relic at the part is considered to be damaged or lost, and an alarm signal is sent out, so that the tracking, the identification and the source tracing of the cultural relic component are realized.
The method provided by the embodiment has high automation degree, does not need manual guard after the installation is finished, and can realize automatic real-time monitoring. The method has high measurement accuracy, is not easy to generate false alarm, and can realize high-reliability monitoring. The real-time differential monitoring of different positions can be realized, and more comprehensive and detailed real-time monitoring information is provided for security personnel, which cannot be realized by the traditional mode. The method is favorable for better realizing the anti-theft protection of the cultural relics and better promoting the implementation of the cultural relic protection work.
Example 2
As shown in fig. 1, fig. 1 is a schematic view of a hyperspectral cultural relic anti-theft protection system based on tag coding, the method provided by the embodiment has high automation degree, manual watching is not needed after installation is completed, and the system can realize automatic real-time monitoring. The method has high measurement accuracy, is not easy to generate false alarm, and can realize high-reliability monitoring. The real-time differential monitoring of different positions can be realized, and more comprehensive and detailed real-time monitoring information is provided for security personnel, which cannot be realized by the traditional mode. The anti-theft protection of the cultural relics is favorably realized, and the cultural relic protection work is better promoted.
The hyperspectral cultural relic detection system provided by the embodiment comprises a 400-plus-1000 nm hyperspectral camera, a light source, a camera bracket, a large-capacity computer, a power supply and the like.
1) And collecting hyperspectral data of the cultural relic body. The hyperspectral image system is used for collecting spectral curves of all parts of the cultural relic, acquiring spectral data of all cultural relics to be monitored, and searching the optimal characteristic peak wavelength position of a frequency spectrum device, namely the wavelength position where the characteristic peak of the frequency spectrum device can be obviously distinguished from the spectrum of the cultural relic body. The obvious difference between the spectrum device characteristic peak and the cultural relic body spectrum of the embodiment is designed according to a preset threshold, the preset threshold meets the condition that the half-peak wide band of the spectrum device and the band where the half-peak width of the cultural relic body are not overlapped, the actual situation can be set according to the specific requirements, when the difference between the two meets the preset threshold, whether the characteristic peak of the spectrum device is stored in the wavelength position range is judged in the collected image, if the characteristic peak exists, the spectrum device exists, the existence of the cultural relic is indicated, otherwise, the file does not exist, the setting of the preset threshold ensures that the spectrum characteristic peak of the spectrum device and the cultural relic body spectrum are clearly distinguished, or the difference between the two wavelength positions is large, the image processing is more facilitated, when the difference between the two spectrum information is large, the interference of noise to the information processing can be overcome, the processing time is saved, the information processing efficiency is improved, the monitoring accuracy is higher, the cultural relic body of the embodiment is mainly stone images, the infrared absorption spectrum of calcium carbonate which is the main component of the stone images is shown in figure 3, and figure 3 is the calcium carbonate infrared absorption spectrum.
2) Designing and preparing multi-section spectrum materials and devices. In the design, 7 positions on a cultural relic body need to be monitored, and the design is transparent in visible light and X is arranged1、X2、X3Three multilayer film devices with characteristic peak positions are attached to the surface of the to-be-protected article, wherein X1、X2、X3The wavelength ranges of 800nm to 1200nm, and the material provided by the embodiment can be used for manufacturing multilayer film devices to be attached to the surface of a cultural relic to be protected by selecting corresponding materials with characteristic peaks at different wavelength ranges according to actual needs.
3) Coding cultural relics to be monitored, coding and splicing film devices with different characteristic peaks according to requirements, marking the existence of the characteristic peak as 1 in a wave band, marking the absence of the characteristic peak as 0, and 2 in 3 kinds of characteristic peaks3The seed coding combination, wherein all 0 s represent that no characteristic peak exists in each wave band, represent the cultural relic per se, and the remaining 7 kinds of characteristic peak coding combinations can be used as 7 specific label numbers and represent 7 positions of the cultural relic; as shown in fig. 2, fig. 2 is a flow chart of a hyperspectral cultural relic anti-theft protection system based on tag coding.
Different substances have different spectral absorption spectra, which are divided into infrared spectra, ultraviolet spectra, etc. according to the wavelength of light. The specific label with the spectrum different from that of the cultural relic to be protected is placed on the cultural relic, the spectrogram of the position of the label is monitored in real time, and the cultural relic can be considered not to be damaged when the specific spectrum can be detected, otherwise, the cultural relic is damaged. Through detecting in different light wave ranges, as detecting in ultraviolet and infrared ranges simultaneously, four detection results which are the same, the same and different exist, namely, the identification and monitoring of three position labels can be realized, and the requirement on the anti-theft protection of multi-position cultural relics is met.
The method for monitoring the anti-theft of the multispectral cultural relics by using the label coding has the key points that the method comprises the following steps:
and detecting a spectrogram of the cultural relic to be protected. And performing spectral measurement on the cultural relic to be protected by utilizing a multispectral camera.
The material is selected. And selecting a plurality of specific labels according to the cultural relic spectrogram and the number of positions needing to be detected. When selecting N spectral ranges, a material with a significant difference from the background cultural relic spectrum needs to be found in each spectral range, and N spectra need to be found. The N materials are coded and spliced as required, the obvious difference in a wave band is marked as 1, the obvious difference is not marked as 0, and the N materials are marked as 2NA code combination, wherein all 0 s represent no difference in each wave band, represent the cultural relic per se, and the rest are 2N1 material code combination can be used as 2N-1 specific tag numbering, effecting pair 2N-identification and monitoring of 1 location. When selecting materials, besides the spectrum needs to have obvious difference, attention needs to be paid to ensure the physical stability of the materials, the harmlessness to the cultural relics and the like, and the influence on the cultural relics is ensured to be as small as possible.
And (5) making a label. Splicing and combining N materials from all 0 to all 1 to generate 2N-1 tag.
And (4) measuring in real time. And fixing the manufactured label on a position to be monitored of the cultural relic, and measuring in real time by using a multispectral camera. When the specific spectrum signal disappears, an alarm signal is sent out, so that the purpose of preventing the cultural relic from being stolen is achieved.
4) And (5) image acquisition. Before the hyperspectral image data are collected, the exposure time of a hyperspectral camera is determined in advance to ensure that the image is clear; determining the speed of the conveyor to avoid distortion of image size and spatial resolution; during data acquisition, a detector of the linear array transversely scans (in the x-axis direction) in the vertical direction of an optical focal plane to acquire image information of each pixel in a strip-shaped space at each wavelength; meanwhile, as the cultural relic advances (in the y-axis direction), the linear array detector sweeps out the whole plane to complete the acquisition of the whole image data, and a hyperspectral image of the cultural relic is obtained.
5) And (5) image calibration. Due to the uneven distribution of the intensity of the light source in each wave band and the existence of dark current noise in the camera, the obtained image contains large noise in the wave band with weak intensity distribution of the light source, so that the obtained hyperspectral image needs to be calibrated. Under the same system condition as the collection of the cultural relic spectrum, firstly, a standard white correction plate is scanned to obtain a full white calibration image W. And then closing a shutter of the camera to acquire an image to obtain a completely black calibration image B. And finally, finishing image calibration to change the acquired absolute image I into a relative image R, wherein the calibration formula is as follows:
R＝(I-B)/(W-B)；
6) software processing and alarming. And transmitting the obtained hyperspectral image to a computer terminal for processing, and inversely solving a corresponding component code according to the gray level difference between the spectrum device in each band photo and the background of the cultural relic and the difference between the spectrum curve of the obtained spectrum device and the spectrum curve of the cultural relic body. When the code of a specific component is found to be changed or disappear, the cultural relic at the part is considered to be damaged or lost, and an alarm signal is sent out, so that the tracking, the identification and the source tracing of the cultural relic component are realized.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or the change made by the person skilled in the art on the basis of the present invention are within the protection scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The anti-theft method for cultural relics based on the spectral monitoring of the hyperspectral camera is characterized in that: the method comprises the following steps:
collecting a hyperspectral image of a cultural relic to be monitored by a hyperspectral camera;
determining the position of a coded label on the cultural relic to be monitored;
determining the spectral characteristics of the cultural relic to be monitored at the position of the coding label;
acquiring the characteristics of the coding label in the hyperspectral image according to the spectral characteristics;
and determining the state information of the cultural relic to be monitored according to the characteristics of the coded label.
2. The anti-theft method for cultural relics based on spectral monitoring of the hyperspectral camera as claimed in claim 1, wherein: the coded label comprises codes marked by a plurality of preset frequency spectrum materials according to a preset sequence, wherein the preset frequency spectrum materials are reflecting materials which are transparent to visible light and have characteristic peak positions in preset wave bands.
3. The anti-theft method for cultural relics based on spectral monitoring of the hyperspectral camera as claimed in claim 1, wherein: the coded labels are arranged at preset positions of the cultural relics to be monitored.
4. The anti-theft method for cultural relics based on spectral monitoring of the hyperspectral camera as claimed in claim 1, wherein: the state information of the cultural relic to be monitored is judged according to the decoding, and the method comprises the following steps:
and judging whether the characteristic peak of the coded tag of the cultural relic to be monitored changes or not according to the decoding, if not, judging that the cultural relic to be monitored is not destroyed or stolen, and if so, judging that the cultural relic to be monitored is destroyed or stolen.
5. The anti-theft method for cultural relics based on spectral monitoring of the hyperspectral camera as claimed in claim 1, wherein: the characteristics of the coded label are extracted according to the following steps:
preprocessing the frequency spectrum image, calculating the gray value difference between the coding label and the background image of the cultural relic to be monitored, judging whether the gray value difference exceeds a preset threshold value, if so, determining that the coding label has a characteristic peak position, and if not, determining that the coding label does not have the characteristic peak position.
6. The hyperspectral camera based spectrum monitoring cultural relic antitheft method according to claim 1, wherein: the characteristic peak position of the coded label is determined according to the following steps:
the method comprises the steps of collecting hyperspectral data of a cultural relic body to be monitored, obtaining a spectral curve of each part of the cultural relic to be monitored according to the hyperspectral data, determining a characteristic peak position according to the spectral curve, and determining a coding label of the cultural relic to be monitored according to the characteristic peak position.
7. The anti-theft method for cultural relics based on spectral monitoring of the hyperspectral camera as claimed in claim 1, wherein: the coded labels are combined in the following way:
selecting a corresponding frequency spectrum material according to the characteristic peak position and manufacturing a corresponding characteristic peak position film device; the film devices with different characteristic peak positions are coded and spliced according to a preset sequence, the characteristic peak is marked as 1 in one wave band, the characteristic peak is not marked as 0, and N characteristic peaks are marked as 2NThe code combination is characterized in that all 0 s represent no characteristic peak in each wave band, represent the cultural relics and are left 2N1 kinds of characteristic peak code combination can be used as 2N-1 tag number, 2 representing cultural relicsN-1 site.
8. The anti-theft method for cultural relics based on spectral monitoring of the hyperspectral camera as claimed in claim 1, wherein: the method also comprises the following steps of calibrating the image of the hyperspectral image, wherein the specific process is as follows:
setting a hyperspectral camera acquisition condition and scanning a standard white correction plate to obtain a full-white calibration image W;
closing a camera shutter to acquire an image to obtain a completely black calibration image B;
the calibration is carried out according to the following formula:
where I denotes an absolute image and R denotes a relative image.
9. Spectrum monitoring historical relic anti-theft system based on hyperspectral camera, its characterized in that: the hyperspectral imager comprises a hyperspectral camera, a control unit and a data processing device;
the control unit is connected with the hyperspectral camera and the data processing device; the control unit is used for controlling the hyperspectral camera;
the hyperspectral camera is used for shooting images of the cultural relics to be monitored, which are provided with the coded labels, and transmitting the shot images to the data processing device; the data processing device is used for analyzing the image and identifying the characteristics in the coded label.
10. The hyperspectral camera-based spectral monitoring cultural relic theft prevention system of claim 9, wherein: the data processing apparatus includes the following sections:
the tag positioning unit is used for determining the position of a coded tag on the cultural relic to be monitored;
the cultural relic spectral feature determining unit is used for determining the spectral feature of the cultural relic to be monitored at the position of the coding label;
the hyperspectral camera control unit is used for acquiring a spectrum image of the coding label under the optical filter through a camera;
the characteristic peak extraction unit is used for transmitting the frequency spectrum image to the data processing device for processing to obtain a characteristic peak position of the coding label;
the decoding unit is used for acquiring the decoding of the coded label according to the characteristic peak position;
and the judging unit is used for judging the state information of the cultural relic to be monitored according to the decoding.
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