Hyperspectral imaging system and control method for hyperspectral imaging system

Abstract

The invention provides a hyperspectral imaging system and a control method for the hyperspectral imaging system. The hyperspectral imaging system comprises an optical assembly which comprises a beam splitter and a PGP light splitting element, and the beam splitter is used for splitting light into a plurality of light paths; the PGP light splitting element comprises a first light splitting element and a second light splitting element, the plurality of light paths comprise a first light path and a second light path, the first light splitting element can split light in the first light path into multiple beams of monochromatic light with the wavelength range of L1-L2, and the second light splitting element can split light in the second light path into multiple beams of monochromatic light with the wavelength range of L3-L4; the detection assembly is used for acquiring first spectral data of the light emitted from the first light splitting element and second spectral data of the light emitted from the second light splitting element; and the data processing component is used for processing the first spectral data and the second spectral data into hyperspectral data with the wavelength range of L1-L4. According to the scheme, the problem of poor data consistency caused by splicing of two spectrometers in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of hyperspectral imaging, and specifically provides a hyperspectral imaging system and a control method for the hyperspectral imaging system. Background Art

[0002] Hyperspectral imaging systems can simultaneously obtain two-dimensional spatial information and one-dimensional hyperspectral data of light, and have important applications in many fields such as address analysis, mineral exploration, ground mapping, military detection, medical equipment, and natural disaster warning. Among them, the spectroscopic element is the core component of the imaging spectrometer. Common types include grating type, filter type, FT type, and computational imaging type. In the grating type spectroscopic element, due to the influence of grating spectroscopic multi-order diffraction, two spectral imaging systems of 400-1000nm and 900-1700nm are usually spliced ​​to achieve a 400-1700nm hyperspectral imaging system.

[0003] However, the splicing of two spectral imaging systems directly leads to problems such as the lenses not having a common field of view, which in turn causes poor consistency in spectral data and high manufacturing and use costs.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0005] In order to solve the problem of poor consistency of spectral data caused by splicing two spectrometers in the prior art, the present invention provides a hyperspectral imaging system. The hyperspectral imaging system of the present invention includes: an objective lens assembly; an optical assembly, the optical assembly is arranged downstream of the objective lens assembly and includes a beam splitter and a PGP beam splitter, the beam splitter is used to divide the light emitted from the objective lens into the optical assembly into multiple light paths; the PGP beam splitter includes a first beam splitter and a second beam splitter, the multiple light paths include a first light path and a second light path, the first beam splitter can divide the light in the first light path into multiple monochromatic lights with wavelengths in the range of L1-L2, and the second beam splitter can divide the light in the second light path into multiple monochromatic lights with wavelengths in the range of L3-L4, wherein L3 is greater than L1 and less than or equal to L2, and L4 is greater than L2; a detection assembly, the detection assembly is used to obtain the first spectral data of the light emitted from the first beam splitter and the second spectral data of the light emitted from the second beam splitter; and a data processing assembly, the data processing assembly is used to process the first spectral data and the second spectral data into hyperspectral data with a wavelength range of L1-L4.

[0006] The hyperspectral imaging system of the present invention uses a beam splitter to divide the incident light into multiple light paths. Therefore, an objective lens assembly can be set upstream of the beam splitter to collect the light emitted from the detection target surface, and then divide it into multiple light paths through the beam splitter for separate processing to solve the problem of non-common field of view caused by the splicing of two spectral imaging systems in the prior art. The hyperspectral imaging system of the present invention mainly uses the grating spectroscopic principle to operate, that is, a PGP spectroscopic element is set. The PGP spectroscopic element includes a first spectroscopic element and a second spectroscopic element. At the same time, the light that passes through the beam splitter is divided into at least a first light path and a second light path. The light in the first light path is divided into multiple monochromatic lights with a wavelength range of L1-L2 after passing through the first spectroscopic element. In other words, the first spectroscopic element allows the light with a wavelength range of L1-L2 to pass through and converts it into multiple monochromatic lights with different wavelengths. The light in the second light path is divided into multiple monochromatic lights with a wavelength range of L3-L4 after passing through the second spectroscopic element. In other words, the second spectroscopic element allows the light with a wavelength range of L3-L4 to pass through and converts it into multiple monochromatic lights with different wavelengths. Among them, L3 is greater than L1 and less than or equal to L2, and L4 is greater than L2. Through the above-mentioned setting, there is an intersection between L1-L2 and L3-L4, so that the first spectral data and the second spectral data are spliced ​​according to the corresponding wavelengths, thereby obtaining hyperspectral data with a wavelength range of L1-L4. The detection component is used to obtain the spectral data of the monochromatic light emitted from the first spectroscopic element and the second spectroscopic component. Through the above-mentioned setting, the light is divided into at least two optical paths under the action of the beam splitter, and each optical path is subjected to spectroscopic processing respectively, so that the hyperspectral imaging system of the present invention can be applied to imaging operations with a wider band, and at the same time, the problem of poor imaging consistency and high manufacturing and use costs caused by the non-common field of view of the objective lenses of the two systems in the scene where two hyperspectral imaging systems are spliced ​​is eliminated.

[0007] In the preferred technical solution of the above-mentioned hyperspectral imaging system, the detection component includes an array detector, and the array detector is provided with a first position and a second position. In the first position, the array detector can obtain the first spectral data; in the second position, the array detector can obtain the second spectral data. The spectral data at least includes a two-dimensional spectral image. Through the above-mentioned setting, the array detector can obtain two-dimensional spectral images at the first position and the second position respectively, further solving the redundancy problem of the detector and the circuit matched therewith caused by the splicing of two spectral imaging systems, so that the present invention can obtain spectral data of multiple different band ranges while using only one array detector and a set of circuits matched therewith, thereby reducing the manufacturing and use costs.

[0008] In the preferred technical solution of the above-mentioned hyperspectral imaging system, the hyperspectral imaging system also includes a base and a first driving device, the optical component and the detection component are fixedly connected to the base, and the base is connected to the first driving device in a transmission manner; when the array detector is placed in the first position, the first driving device can drive the base to move, and push-scan the detection target captured by the objective lens component through the optical component, so that the array detector obtains the first spectral data of the detection target; when the array detector is placed in the second position, the first driving device can drive the base to move, and push-scan the detection target through the optical component, so that the array detector obtains the second spectral data of the detection target. Through the above-mentioned setting, the first driving device drives the base to move, and drives the optical component set on the base to push-scan the detection target captured by the objective lens component, so that multiple continuous frames of two-dimensional spectral images can be continuously obtained on the array detector, and these continuous two-dimensional spectral images can correspond to their spatial positions, so as to be converted into three-dimensional hyperspectral data in the subsequent data processing process.

[0009] In the preferred technical solution of the above-mentioned hyperspectral imaging system, the optical component also includes a slit and a collimator group arranged upstream of the beam splitter and arranged in sequence along the light transmission direction, the slit allows part of the light entering the objective lens assembly from the detection target surface to pass through, and the collimator group is used to convert the light passing through the slit into parallel light.

[0010] In a preferred technical solution of the above-mentioned hyperspectral imaging system, the detection component further includes a second driving device drivingly connected to the area array detector, and the second driving device can drive the area array detector to switch between the first position and the second position.

[0011] In the preferred technical solution of the above-mentioned hyperspectral imaging system, the optical component further includes a reflector disposed between the beam splitter and the second beam splitting element, and the reflector is used to switch the light in the second light path to be parallel to the light in the first light path. Through the above-mentioned setting, the first light path and the second light path are configured to be parallel, so that the area array detector only needs to translate between the two first positions and the second position (that is, it is set to have one degree of freedom) to collect accurate data without adding movement in other directions, thereby ensuring the accuracy of the spectral imaging system.

[0012] In the preferred technical solution of the above-mentioned hyperspectral imaging system, the optical component further includes a converging lens group, the converging lens group includes a first converging lens group and a second converging lens group, the first converging lens group is arranged downstream of the first beam splitting element and can converge the monochromatic light emitted from the first beam splitting element to the surface array detector located at the first position, and the second converging lens group is arranged downstream of the second beam splitting element and can converge the monochromatic light emitted from the second beam splitting element to the surface array detector located at the second position. . The first optical path and the second optical path have different optical axes. Through the above-mentioned arrangement, the monochromatic light generated by beam splitting in the first optical path and the second optical path can be focused to corresponding positions, so that the surface array detector can acquire it at the first position and the second position respectively.

[0013] In the preferred technical solution of the above-mentioned hyperspectral imaging system, the objective lens assembly includes an aberration lens, and the wavelength range of the aberration lens is L1-L4.

[0014] In order to solve the problem of poor consistency of spectral data caused by splicing two spectrometers in the prior art, the present invention also provides a control method for a hyperspectral imaging system. The hyperspectral imaging system includes: an objective lens assembly; an optical assembly, the optical assembly is arranged downstream of the objective lens assembly and includes a beam splitter and a PGP beam splitter element, the beam splitter is used to split the light entering the optical assembly from the objective lens into multiple light paths; the PGP beam splitter element includes a first beam splitter element and a second beam splitter element, the multiple light paths include a first light path and a second light path, the first beam splitter element can split the light in the first light path into multiple beams of monochromatic light with a wavelength range of L1-L2, the second beam splitter element can split the light in the second light path into multiple beams of monochromatic light with a wavelength range of L3-L4, wherein L3 is greater than L1 and less than or equal to L2, and L4 is greater than L2; a detection assembly, the detection assembly is used to obtain The first spectral data of the light emitted from the first spectroscopic element and the second spectral data of the light emitted from the second spectroscopic element; and a data processing component, the data processing component is used to process the first spectral data and the second spectral data into hyperspectral data with a wavelength range of L1-L4, and the control method includes: using a detection component to obtain the first spectral data and the second spectral data; performing image registration on the first spectral data and the second spectral data, and calculating the affine matrix between the first spectral data and the second spectral data; based on the affine matrix, transforming the second spectral data into affine spectral data; splicing the first spectral data and the affine spectral data, so as to generate the hyperspectral data. Through the above-mentioned setting, the first spectral data and the second spectral data are generated based on the light entering the hyperspectral imaging system in the same field of view, and after registration, three-dimensional hyperspectral data with a wider band can be generated, which solves the problem of poor imaging consistency and high manufacturing and use costs caused by the non-common field of view of the hyperspectral imaging system in the prior art.

[0015] In the preferred technical scheme of the control method for the above-mentioned hyperspectral imaging system, the detection component includes an area array detector, and the area array detector is provided with a first position and a second position. In the first position, the area array detector can obtain the first spectral data; in the second position, the area array detector can obtain the second spectral data; the hyperspectral imaging system also includes a base and a first driving device, the optical component and the detection component are fixedly connected to the base, and the base is transmission-connected to the first driving device; the step of "using the detection component to obtain the first spectral data and the second spectral data" includes: placing the area array detector in the first position, using the first driving device to drive the base to move, and using the optical component to push-scan the detection target captured by the objective lens component, so that the area array detector obtains the first spectral data of the detection target; placing the area array detector in the second position, using the first driving device to drive the base to move, and using the optical component to push-scan the detection target, so that the area array detector obtains the second spectral data of the detection target. Through the above-mentioned setting, spectral data of different bands collected based on the same field of view are received by the same planar array detector through two optical paths respectively, and are finally spliced ​​into a continuous wide-band hyperspectral data, which greatly improves the application scenarios of the hyperspectral imaging system of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0017] Figure 1 is a schematic structural diagram of an embodiment of a hyperspectral imaging system of the present invention;

[0018] Figure 2 is a flow chart of an embodiment of a control method for a hyperspectral imaging system according to the present invention;

[0019] Figure 3 It is a partial flow chart of an embodiment of a control method for a hyperspectral imaging system according to the present invention.

[0020] List of reference numerals:

[0021] 100. Hyperspectral imaging system; 10. Objective lens assembly; 20. Optical assembly; 21. Slit; 22. Collimating lens assembly; 23. Beam splitter; 24. PGP spectroscopic element; 241. First spectroscopic element; 242. Second spectroscopic element; 243. First prism; 244. Second prism; 245. Grating; 25. Reflector; 26. Converging lens assembly; 261. First converging lens assembly; 262. Second converging lens assembly; 30. Detection assembly; 31. Array detector; 32. Second driving device; 40. Base; 41. First driving device. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0023] It should be noted that, in the description of the present invention, the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In order to solve the problem of poor consistency of spectral data caused by splicing two spectrometers in the prior art, the present invention provides a hyperspectral imaging system 100. The hyperspectral imaging system 100 of the present invention comprises: an objective lens assembly 10; an optical assembly 20, the optical assembly 20 being arranged downstream of the objective lens assembly 10 and comprising a beam splitter 23 and a PGP beam splitter element 24, the beam splitter 23 being used to split the light incident from the objective lens into the optical assembly 20 into a plurality of light paths; the PGP beam splitter element 24 comprising a first beam splitter element 241 and a second beam splitter element 242, the plurality of light paths comprising a first light path and a second light path, the first beam splitter element 241 being able to split the light in the first light path into a plurality of light beams having a wavelength range of L1-L2. Monochromatic light, the second beam splitter element 242 can split the light in the second optical path into multiple beams of monochromatic light with wavelengths in the range of L3-L4, wherein L3 is greater than L1 and less than or equal to L2, and L4 is greater than L2; a detection component 30, the detection component 30 is used to obtain first spectral data of the light emitted from the first beam splitter element 241 and second spectral data of the light emitted from the second beam splitter element 242; and a data processing component, the data processing component is used to process the first spectral data and the second spectral data into high spectral data in the wavelength range of L1-L4.

[0026] Figure 1 Schematic diagram of the structure of an embodiment of the hyperspectral imaging system of the present invention. Figure 1 As shown, the hyperspectral imaging system 100 of the present invention includes an objective lens assembly 10, an optical assembly 20, a detection assembly 30 and a data processing assembly.

[0027] The light scattered by the detection target surface can enter the hyperspectral imaging system 100 through the objective lens assembly 10. Exemplarily, when the objective lens assembly 10 captures a certain detection target, the light scattered by the detection target surface enters the hyperspectral imaging system 100 through the objective lens assembly 10, and the spectral data of the detection target is generated. The spectral data may include spatial domain data and spectral domain data. Exemplarily, the spatial information of the detection target can be represented on the X and Y axes, and the spectral information of the detection target can be represented on the Z axis. By analyzing and splicing these data, the data can be further converted into an image of the detection target. In one or more embodiments, the objective lens assembly 10 includes an aberration lens, and the wavelength range of the aberration lens is between L1-L4 (so as to match the PGP spectroscopic element 24). Ablation is mainly to eliminate chromatic aberration, which is caused by the difference in dispersion and refractive index of light of different wavelengths in the glass, resulting in different focal points for light of different wavelengths. Through the setting of the aberration lens, the light of the wavelength range between L1-L4 scattered by the detection surface is prevented from being affected by the inherent chromatic aberration of the lens glass, thereby ensuring the accuracy of the spectral data.

[0028] Continue reading Figure 1 In one or more embodiments, the optical component 20 includes a slit 21 and a collimator lens group 22. In order to accurately analyze the spectral information at each point of the detection target, the detection target can be observed through a narrow light inlet. When the relative position of the objective lens assembly 10 and the slit 21 remains unchanged, the slit 21 allows a line of light reflecting the characteristics of the detection target to enter the optical component 20, and the spectral data of the corresponding line of light is obtained by the detection component 30. It can be understood that when the detection target can be moved, the detection target can be driven to scan the objective lens assembly 10, so that the spectral data of multiple lines of light on the detection target are obtained by the detection component 30, and then the image of the detection target corresponding to the multiple lines of light is generated; when the detection target cannot be moved, the slit 21 can be moved so that the spectral data of multiple lines of light scattered from the surface of the detection target into the objective lens assembly 10 are obtained by the detection component 30, and the image corresponding to the detection target can also be generated. In an alternative embodiment, the setting of the slit 21 can also be cancelled, and other suitable aperture structures can be set at the entrance of the optical component 20.

[0029] Continue reading Figure 1 The collimating assembly includes at least one lens for converting the light passing through the slit 21 into parallel light so as to analyze the spectral data of the light.

[0030] Continue reading Figure 1, the optical assembly 20 further includes a beam splitter 23. The light emitted from the collimating lens group 22 can be split into two light paths by the beam splitter 23. The light before and after the beam splitting only has a difference in light intensity, and the spectral data of the light in different light paths are still the same. The beam splitter 23 can be a Wollaston prism, a half-silvered mirror, a light beam splitter 23, etc. Alternatively, the beam splitter 23 can also split the light into more than two light paths, such as three or four different light paths, for subsequent processing.

[0031] Continue reading Figure 1 The optical component 20 also includes a PGP spectroscopic element 24 (i.e., a prism-grating-prism element). Each PGP spectroscopic element 24 includes a first prism 243, a second prism 244, and a grating 245. The grating 245 is arranged between the first prism 243 and the second prism 244 and is perpendicular to the light transmission direction. Parallel light is incident on the first prism 243 and dispersed by the first prism 243 to form light beams of different wavelengths and unequal angles and are incident on the grating 245. The light beam after passing through the grating 245 is dispersed by the second prism 244. The central wavelength of the light beam dispersed by the second prism 244 will not be deflected, and it can be emitted in parallel along the optical axis direction, separated in space according to different wavelength bands, and finally form multiple spectral bands on the detection component 30. The position and intensity of each pixel on the detection component 30 represent the spectrum and light intensity. By analyzing the spectrum and light intensity, the characteristics of a line of light obtained through the slit 21 can be fully reflected. Then, through mechanical push-scanning (as mentioned above, the push-scanning form can be that the detection target moves relative to the spectral imaging system, or the detection target and the objective lens assembly 10 are stationary, and the slit 21 and the optical assembly 20 and the detection assembly 30 behind the slit 21 move), the spectral data collection of the entire detection target can be completed.

[0032] In one or more embodiments, the PGP spectroscopic element 24 includes a first spectroscopic element 241 and a second spectroscopic element 242. The plurality of optical paths include a first optical path and a second optical path, the first spectroscopic element 241 can split the light in the first optical path into multiple monochromatic lights with wavelengths in the range of L1-L2, and the second spectroscopic element 242 can split the light in the second optical path into multiple monochromatic lights with wavelengths in the range of L3-L4, wherein L3 is greater than L1 and less than or equal to L2, and L4 is greater than L2. In one or more embodiments, L1-L2 is configured to be 400-1000nm. L3-L4 is configured to be 900-1700nm. Alternatively, L1, L2, L3, and L4 can also be configured to other suitable values. Through the above configuration, the hyperspectral imaging system 100 of the present invention can perform hyperspectral imaging in a wide band range of 400nm-1700nm, with a wide range of applications, solving the problems of non-common field of view and high cost caused by the current 400nm-1700nm wide band hyperspectral imaging which mainly uses two spectral imagers for data splicing.

[0033] In an alternative embodiment, the PGP beam splitter element 24 may also include more beam splitter elements to adapt to the multiple light paths split by the beam splitter 23, for example, three beam splitter elements are provided for beam splitting of three light paths.

[0034] Continue reading Figure 1 In one or more embodiments, the optical component 20 further includes a reflector 25 disposed between the beam splitter 23 and the second beam splitting element 242. The reflector 25 is used to switch the light in the second light path to be parallel to the light in the first light path. Through the above-mentioned arrangement, the first light path and the second light path are configured to be parallel, so that the light receiving device in the detection component 30 only needs to translate on a straight line perpendicular to the optical axis direction of the first light path (i.e., it is set to have 1 degree of freedom) to collect data from the two light paths without adding movement in other directions, thereby ensuring the accuracy of the spectral imaging system.

[0035] Continue reading Figure 1 , the detection assembly 30 includes a planar array detector 31. The planar array detector 31 is arranged downstream of the optical assembly 20, and is used to receive light and obtain spectral data in the light. The planar array detector 31 is provided with a first position a and a second position. In the first position a, the planar array detector 31 can obtain the first spectral data of the light emitted from the first spectroscopic element 241; in the second position, the planar array detector 31 can obtain the second spectral data of the light emitted from the second spectroscopic element 242. In one or more embodiments, the detection assembly 30 also includes a second driving device 32. The second driving device 32 is connected to the planar array detector 31 in a transmission manner, and can drive the planar array detector 31 to move between the first position a and the second position b. Exemplarily, the second driving device 32 can be configured in the form of a motor and a lead screw. Through the above-mentioned setting, one planar array detector 31 can solve the problem of spectral collection on two optical paths, which is lower in cost than the prior art. In an alternative embodiment, one planar array detector 31 can also be provided at the end of each of the first optical path and the second optical path.

[0036] Continue reading Figure 1 In one or more embodiments, the optical assembly 20 further includes a converging lens group 26. The converging lens group 26 includes a first converging lens group 261 and a second converging lens group 262. The first converging lens group 261 is disposed downstream of the first beam splitter element 241 and can converge the monochromatic light emitted from the first beam splitter element 241 onto the surface array detector 31 located at the first position a. The second converging lens group 262 is disposed downstream of the second beam splitter element 242 and can converge the monochromatic light emitted from the second beam splitter element 242 onto the surface array detector 31 located at the second position b. Through the arrangement of the converging lens group 26, the monochromatic light separated by the beam splitter element can form a spectral band on the surface array detector 31 in a neat order of wavelengths.

[0037] Continue reading Figure 1 In one or more embodiments, the hyperspectral imaging system 100 further includes a base 40 and a first driving device 41. The optical component 20 and the detection component 30 are both fixedly connected to the base 40, so that the positions of the optical component 20 and the detection component 30 relative to the base 40 remain unchanged during the movement of the base 40. As described above, the push-broom imaging method can be achieved by moving the detection target or moving the optical component 20. The present invention uses the push-broom imaging method of moving the optical component 20 and its matching detection component 30.

[0038] Continue reading Figure 1 , the base 40 is connected to the first driving device 41 in a transmission connection, and the first driving device 41 can drive the base 40 to move in a predetermined direction. Specifically, the predetermined direction is perpendicular to the direction of the optical axis of the objective lens assembly 10, and the direction can be the same as the moving direction of the area array detector 31 (i.e., the extension direction of the screw rod), and can also be configured to form a certain angle according to actual needs. When the area array detector 31 is placed in the first position a, the first driving device 41 can drive the base 40 to move, and push-scan the detection target captured by the objective lens assembly 10 through the optical component 20, so that the area array detector 31 obtains the first spectral data of the detection target; when the area array detector 31 is placed in the second position b, the first driving device 41 can drive the base 40 to move, and push-scan the detection target through the optical component 20, so that the area array detector 31 obtains the second spectral data of the detection target. Exemplarily, the first driving device 41 can be configured as a transmission form of a motor and a screw rod.

[0039] In one or more embodiments, the hyperspectral imaging system 100 further includes a data processing component for processing the first spectral data and the second spectral data into hyperspectral data in the wavelength range of L1-L4.

[0040] Figure 2 is a flow chart of an embodiment of a control method for a hyperspectral imaging system according to the present invention; Figure 3 1 is a partial flow chart of an embodiment of a control method for a hyperspectral imaging system of the present invention. The present invention also provides a control method for a hyperspectral imaging system. Figure 2As shown, after the control method for the hyperspectral imaging system of the present invention is started, step S1 is first executed, that is, the detection component 30 is used to obtain the first spectral data and the second spectral data. In one or more embodiments, the detection component 30 includes an array detector 31, and the array detector 31 is provided with a first position a and a second position b. In the first position a, the array detector 31 can obtain the first spectral data; in the second position b, the array detector 31 can obtain the second spectral data. The hyperspectral imaging system 100 also includes a base 40 and a first driving device 41. The optical component 20 and the detection component 30 are fixedly connected to the base 40, and the base 40 is drivingly connected to the first driving device 41.

[0041] Furthermore, if Figure 3 As shown, the step of "using the detection component 30 to obtain the first spectral data and the second spectral data" includes S11, that is, placing the area array detector 31 at the first position a, using the first driving device 41 to drive the base 40 to move, and using the optical component 20 to push-scan the detection target captured by the objective lens component 10, so that the area array detector 31 obtains the first spectral data of the detection target. Then, step S12 is performed, that is, placing the area array detector 31 at the second position b, using the first driving device 41 to drive the base 40 to move, and using the optical component 20 to push-scan the detection target, so that the area array detector 31 obtains the second spectral data of the detection target. Specifically, the base 40 can be provided with a first push-scan position and a second push-scan position. After the area array detector 31 is placed at the first position a, the base 40 moves from the first push-scan position to the second push-scan position to complete the push-scan of the first spectral data. After the area array detector 31 is placed at the second position b, the base 40 moves from the second push-scan position to the first push-scan position to complete the push-scan of the second spectral data. Alternatively, the push-scan method can also be set to any other suitable method.

[0042] After the first spectral data and the second spectral data are acquired, step S2 is executed, that is, image registration is performed on the first spectral data and the second spectral data, and the affine matrix between the first spectral data and the second spectral data is calculated. Both the first spectral data and the second spectral data include spectral bands of multiple continuous frames, and different colors in the spectral bands represent different bands. Since the detection target remains stationary during the push-scan process, the spectral images between continuous frames only produce a slight image offset, and the overlap is large, and the SURF (Speeded-up Robust Feature) software can be used to perform image registration on the continuous frames. However, since the first spectral data and the second spectral data are not generated in the same optical path, there is a certain deviation, so it is necessary to find feature points to calculate the affine matrix for correction. Exemplarily, feature extraction can be performed on the spectral image in the first spectral data and the spectral image in the corresponding second spectral data. Then, the extracted feature points are compared for similarity, a threshold is set, and feature points with high similarity are retained. Finally, feature matching is performed on the remaining feature points to calculate the affine matrix.

[0043] Then, step S3 is entered, that is, based on the affine matrix, the second spectral data is transformed into affine spectral data. The transformed affine spectral data has good consistency with the first spectral data, so that the first spectral data and the affine spectral data can be spliced ​​to generate hyperspectral data (step S4). Through the above technical solution, the wide-band imaging that can be achieved by using the hyperspectral imaging system of the present invention solves the problems of poor consistency and high cost when splicing spectral data in the prior art.

[0044] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A hyperspectral imaging system, characterized in that: The hyperspectral imaging system comprises: Objective lens assembly; An optical assembly, the optical assembly is arranged downstream of the objective lens assembly and comprises a beam splitter and a PGP beam splitter element, the beam splitter is used to split the light incident from the objective lens into a plurality of light paths; the PGP beam splitter element comprises a first beam splitter element and a second beam splitter element, the plurality of light paths comprise a first light path and a second light path, the first beam splitter element can split the light in the first light path into a plurality of monochromatic lights with wavelengths in the range of L1-L2, the second beam splitter element can split the light in the second light path into a plurality of monochromatic lights with wavelengths in the range of L3-L4, wherein L3 is greater than L1 and less than or equal to L2, and L4 is greater than L2; a detection component, the detection component being used to obtain first spectrum data of the light emitted from the first spectroscopic element and second spectrum data of the light emitted from the second spectroscopic element; and A data processing component is used to process the first spectral data and the second spectral data into hyperspectral data in the wavelength range of L1-L4.

2. The hyperspectral imaging system according to claim 1, characterized in that: The detection component includes an area array detector, and the area array detector is provided with a first position and a second position. In the first position, the area array detector can acquire the first spectral data; in the second position, the area array detector can acquire the second spectral data.

3. The hyperspectral imaging system according to claim 2, characterized in that: The hyperspectral imaging system further comprises a base and a first driving device, the optical component and the detection component are both fixedly connected to the base, and the base is drivingly connected to the first driving device; When the area array detector is placed in the first position, the first driving device can drive the base to move, and push-scan the detection target captured by the objective lens assembly through the optical assembly, so that the area array detector acquires the first spectrum data of the detection target; When the area array detector is placed in the second position, the first driving device can drive the base to move, and push-scan the detection target through the optical component, so that the area array detector acquires the second spectral data of the detection target.

4. The hyperspectral imaging system according to claim 3, characterized in that: The optical component also includes a slit and a collimator group arranged upstream of the beam splitter and arranged in sequence along the light transmission direction, the slit allows part of the light entering the objective lens assembly from the detection target surface to pass through, and the collimator group is used to convert the light passing through the slit into parallel light.

5. The hyperspectral imaging system according to claim 2, characterized in that: The detection assembly further includes a second driving device drivingly connected to the area array detector, and the second driving device can drive the area array detector to switch between the first position and the second position.

6. The hyperspectral imaging system according to claim 2, characterized in that: The optical component also includes a converging lens group, which includes a first converging lens group and a second converging lens group. The first converging lens group is arranged downstream of the first beam splitting element and can converge the monochromatic light emitted from the first beam splitting element onto the area array detector located at the first position. The second converging lens group is arranged downstream of the second beam splitting element and can converge the monochromatic light emitted from the second beam splitting element onto the area array detector located at the second position.

7. The hyperspectral imaging system according to claim 1, characterized in that: The optical component further includes a reflector disposed between the beam splitter and the second beam splitting element, and the reflector is used to switch the light in the second light path to be parallel to the light in the first light path.

8. The hyperspectral imaging system according to claim 1, characterized in that: The objective lens assembly includes an aberration lens, and the wavelength range of the aberration lens is L1-L4.

9. A control method for a hyperspectral imaging system, characterized in that: The hyperspectral imaging system comprises: an objective lens assembly; an optical assembly, wherein the optical assembly is arranged downstream of the objective lens assembly and comprises a beam splitter and a PGP beam splitter element, wherein the beam splitter is used to split the light emitted from the objective lens into a plurality of light paths; the PGP beam splitter element comprises a first beam splitter element and a second beam splitter element, wherein the plurality of light paths comprise a first light path and a second light path, wherein the first beam splitter element can split the light in the first light path into a plurality of monochromatic lights having a wavelength range of L1-L2, and the second beam splitter element can split the light in the second light path into a plurality of monochromatic lights having a wavelength range of L3-L4, wherein L3 is greater than L1 and less than or equal to L2, and L4 is greater than L2; a detection assembly, wherein the detection assembly is used to obtain first spectral data of the light emitted from the first beam splitter element and second spectral data of the light emitted from the second beam splitter element; and a data processing assembly, wherein the data processing assembly is used to process the first spectral data and the second spectral data into hyperspectral data having a wavelength range of L1-L4, The control method comprises: Acquire the first spectral data and the second spectral data using a detection component; Performing image registration on the first spectral data and the second spectral data, and calculating an affine matrix between the first spectral data and the second spectral data; Based on the affine matrix, transforming the second spectral data into affine spectral data; The first spectrum data and the affine spectrum data are concatenated to generate the hyperspectral data.

10. The control method for a hyperspectral imaging system according to claim 9, characterized in that: The detection assembly includes a planar array detector, and the planar array detector is provided with a first position and a second position. In the first position, the planar array detector can obtain the first spectral data; in the second position, the planar array detector can obtain the second spectral data; the hyperspectral imaging system also includes a base and a first driving device, the optical assembly and the detection assembly are both fixedly connected to the base, and the base is drivingly connected to the first driving device; The step of "using a detection component to obtain the first spectral data and the second spectral data" includes: The planar array detector is placed at the first position, the base is driven to move by the first driving device, and the detection target captured by the objective lens assembly is push-scanned by the optical assembly, so that the planar array detector acquires the first spectral data of the detection target; The area array detector is placed at the second position, the base is driven to move by the first driving device, and the detection target is push-scanned by the optical component, so that the area array detector obtains the second spectral data of the detection target.

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