Light and small cross-scale cultural relic multi-modal atlas digital information integrated acquisition system

Abstract

The invention discloses a light and small cross-scale cultural relic multi-modal atlas digital information integrated acquisition system, which comprises a shell, a cross-scale observation imaging lens group, a miniature on-chip coating composite filtering spectrum imaging module and a cross-scale adjustment control module are integrated in the shell, and an integrated spectrum light source is arranged at the front end of the shell; a multi-modal map data processing module is externally arranged, is connected with a micro on-chip coating composite filtering spectral imaging module, and comprises a multi-spectral image reconstruction module under composite filtering, a color image synthesis module and a local 3D geometric image representation module; the multispectral image reconstruction module carries out calculation based on the original grayscale image data output by the miniature on-chip coating composite filtering spectral imaging module, and carries out reconstruction by using a spectral reconstruction algorithm to obtain multispectral image data; the color image synthesis module performs color image synthesis based on the multispectral image data; and the local 3D geometric image representation module is used for generating an image representing the local 3D geometric information of the cultural relic surface.

Description

Technical Field

[0001] This invention relates to the fields of cultural relic protection, restoration, monitoring, and management, and specifically to a lightweight, multi-scale, multimodal digital information acquisition system for cultural relics. Background Technology

[0002] Cultural relics are the common wealth of humankind, possessing rich cultural, historical, and artistic value. The most important task in the protection, restoration, monitoring, and management of cultural relics is acquiring and analyzing multimodal information about their materials, craftsmanship, and visual characteristics. This work is of great significance for the protection and research of cultural relics, the restoration of their original appearance, and the transmission of their cultural value.

[0003] Currently, methods for acquiring and analyzing cultural relic information mainly include traditional expert visual analysis, sampling and testing, and single-dimensional digital information acquisition and analysis. Sampling and testing is a destructive analysis method with limited application scenarios and can only focus on localized areas of the relic. Traditional expert visual analysis capabilities are limited, making accurate identification of complex relic compositions impossible. Single-dimensional digital information acquisition and analysis, such as images or materials, collects overly simplistic information, failing to provide a comprehensive and integrated understanding of the relic. For example, spectral analysis and microscopic imaging methods analyze relic information from a single material or spatial dimension, lacking holistic information acquisition and analysis, and making it difficult to conduct multi-dimensional, three-dimensional analysis of the relic's overall appearance. Therefore, traditional analysis methods can be combined to obtain more comprehensive information, but this is extremely costly in terms of manpower, resources, and time, and suffers from poor multi-source coordination and overall integration, resulting in insufficient accuracy and comprehensiveness in the acquisition and analysis of cultural relic information.

[0004] Comparative analysis of existing technologies reveals that while spectral technology can acquire spectral information of target materials and imaging methods can acquire target image information, hyperspectral imaging technology can simultaneously acquire both target image and spectral information, covering a range of bands from visible light to infrared. It boasts advantages such as remote sensing, integrated material vision detection, and the extraction of information invisible to the human eye, along with characteristics of being non-destructive, fast, and efficient. With hundreds of spectra and high-resolution spectral and image information, it can be used to perceive and analyze subtle changes in material, color, pattern, and texture on the surface of cultural relics. Based on this, it is possible to determine the abnormalities, material properties, craftsmanship characteristics, and degradation state of cultural relics. Therefore, hyperspectral imaging technology has become an important means of acquiring and analyzing information about cultural relics. In particular, its integrated perception capability of multimodal information such as material, texture, color, and pattern allows for the integrated application of the acquired multimodal spectral data, greatly improving the overall systematic analysis capability of complex, similar, and invisible information.

[0005] However, as mentioned above, existing multimodal digital information acquisition of cultural relics mostly involves the combined use of single-modal systems, resulting in poor multimodal integration of acquired data, inadequate coupling application capabilities, and a lack of efficient multimodal integrated portable lightweight information acquisition systems. Summary of the Invention

[0006] To address the need for efficient and integrated acquisition of multimodal atlas information when acquiring digital information of cultural relics, this invention provides a lightweight, multi-scale integrated digital information acquisition system for multimodal atlases of cultural relics.

[0007] To achieve the above objectives, the present invention employs the following technical solution: A lightweight, multi-scale, multimodal image digital information acquisition system for cultural relics includes a housing. Inside the housing are integrated a multi-scale observation imaging lens group, a miniature on-chip coated composite filter spectral imaging module, and a multi-scale adjustment and control module. An externally connected multimodal image data processing module is also included. An integrated spectral light source is located at the front end of the housing. Among these components: The cross-scale observation imaging lens group is an optical imaging lens group based on the principle of optical fixed focus. It is used to achieve high-performance observation imaging at different spatial scales and can achieve corresponding imaging magnification, imaging spatial resolution and corresponding field of view at different object distances. The core of the micro-on-chip coated composite filter spectral imaging module is an integrated camera detector chip. A spectral composite filter film is coated on the surface of the camera chip to achieve filtering of spectral signals of different wavelengths at different pixels of the camera chip according to specific different transmittances. With the help of the rear imaging module and the camera chip, photosensitive imaging is completed. The cross-scale adjustment control module includes a high-resolution stepper motor and a high-precision lead screw. The motor rotation drives the lead screw rotation, thereby realizing the back intercept adjustment between the miniature on-chip coated composite filter spectral imaging module on the lead screw guide rail and the cross-scale observation imaging mirror group. The integrated spectral light source is installed around the front end of the multi-scale observation imaging lens group and is located at the front end of the housing; the integrated spectral light source is composed of multiple low-temperature spectral LEDs with emission wavelengths covering the visible and near-infrared spectral bands integrated in a ring structure; The multimodal image data processing module is connected to the on-chip coating composite filter spectral imaging module. It includes a multispectral image reconstruction module under composite filtering, a color image synthesis module, and a local 3D geometric image representation module. The multispectral image reconstruction module calculates based on the original grayscale image data output by the on-chip coating composite filter spectral imaging module and reconstructs multispectral image data using a spectral reconstruction algorithm. The color image synthesis module performs color image synthesis based on the multispectral image data. The local 3D geometric image representation module is used to generate images representing the local 3D geometric information of the artifact surface.

[0008] Furthermore, the spectral composite filter film on the surface of the camera chip is composed of filter film units. The area of ​​the spectral composite filter film should be larger than the detector array area of ​​the camera chip, and the size of a single filter film unit matches the detector pixel size. A 3×3 composite coating filter is cyclically applied to the horizontal and vertical dimensions of the camera chip surface. Every 3×3 detector pixels form a pixel block, and the filter film unit on each detector pixel in the pixel block achieves a defined coating filter response. The same composite filter film is repeated on different pixel blocks, corresponding to the same composite filter response. Thus, multiple composite filter blocks with the same composite filter response on the camera chip can be obtained.

[0009] Furthermore, the composite filter film of each pixel block completes the composite filtering of the spectral signals of its corresponding 3×3 detector pixels; by calculating the composite filtering data of the spectral signals of each pixel block through the spectral reconstruction algorithm, the spectral image data of each pixel block can be obtained; and by calculating the composite filtering data of the spectral signals of all pixel blocks, the spectral image data of all coated composite filter blocks can be obtained.

[0010] Furthermore, the cross-scale observation imaging lens group is fixed on the first support member inside the housing, while the micro-on-chip coated composite filter spectral imaging module is mounted on the second support member inside the housing via a lead screw guide rail, with the optical axes of the two coinciding; the stepper motor drives the micro-on-chip coated composite filter spectral imaging module to move back and forth on the guide rail via the lead screw, so as to realize the back intercept change between it and the cross-scale observation imaging lens group, thereby realizing the cross-scale change of imaging spatial resolution and cross-scale imaging observation.

[0011] Furthermore, each LED in the integrated spectral light source can be independently controlled in terms of brightness and on / off state through a corresponding switch control unit.

[0012] Furthermore, the color image synthesis module synthesizes a color image using three wavelength image data selected from the corresponding red, green, and blue wave ranges in the multispectral image data, following a pseudo-color synthesis method.

[0013] Furthermore, the local 3D geometric image representation module controls the switching of different LED beads in the spectral integrated light source through the switch control unit, acquires synthetic color images under different directional lighting conditions, and uses the photometric stereo method to calculate the representation image of the local 3D geometric information of the artifact surface through normals.

[0014] An integrated method for acquiring digital information of multimodal maps of small, multi-scale cultural relics, including: For acquiring multimodal digital information of cultural relics, a lightweight, multi-scale integrated digital information acquisition system for multimodal images of cultural relics is pre-positioned at a predetermined distance and directly facing the cultural relics, and then information is collected at a macroscopic location: The integrated spectral light source activates all LEDs to provide illumination. The cross-scale adjustment control module adjusts the position of the on-chip coated composite filter spectral imaging module to achieve system focus and ensure clear imaging. Image data is then acquired using the rear imaging module and camera chip. The acquired grayscale image is reconstructed using the multispectral image reconstruction module within the multimodal spectral data processing module to obtain a multispectral image. This multispectral image is then processed using the color image synthesis module to obtain a color image under full illumination conditions. Then, control all the LED beads of the integrated spectral light source to turn on their respective switches in sequence, and adjust the exposure time of the rear imaging module and camera chip; under the illumination conditions where the LED beads are turned on in each direction, collect the corresponding image data in that direction and process it using the multimodal spectral data processing module to obtain color images under different illumination conditions; finally, the local 3D geometric image representation module combines the color images under full illumination conditions and uses the color images under local illumination conditions in all different directions to perform normal calculations to obtain the normal representation image of local 3D geometric information; After the above process is completed, the system position is adjusted to a preset microscopic close distance from the cultural relic. The back intercept is adjusted through the cross-scale observation control module, and the focus is completed. The exposure time is adjusted and the clarity of the acquired image is tested. Then, the information acquisition at the microscopic close distance is achieved by using the same method as the information acquisition at the macroscopic position. By adjusting different microscopic proximity distances and collecting information at each microscopic proximity location, multispectral reconstructed images, synthetic color images, and local 3D geometric normal characterization images are obtained at macroscopic locations and multiple microscopic proximity locations, thereby completing the integrated acquisition of complete cross-scale multimodal map digital information.

[0015] Compared with the prior art, the present invention has the following technical features: This invention uses hyperspectral imaging technology as its core and integrates multiple functional components to achieve unified perception of visual (color, texture, pattern), material, and local 3D geometric information of cultural relics across different observation scales, while ensuring the system's compact size. Applied to cultural relic protection, restoration, monitoring, and management, it can significantly improve the integrated, efficient, and convenient acquisition of multimodal image information of cultural relics. Attached Figure Description

[0016] Figure 1 This is a framework diagram of the system of the present invention; Figure 2 This is a schematic diagram of the system structure of the present invention; Figure 3 This is a schematic diagram of a microchip-coated composite filter; Figure 4This is a schematic diagram of a cross-scale adjustment and control module; Figure 5 This is a schematic diagram of a light source designed with spectral LED beads integrated in a ring shape; Figure 6 This is a schematic diagram of the integrated acquisition process of digital information for multimodal images of cultural relics across scales. Detailed Implementation

[0017] In daily use, the portability and compactness of the cultural relic digital information acquisition system should be given priority consideration, and a non-destructive low-heat spectral light source should be integrated to meet the needs of efficient use in different scenarios. In particular, when dealing with historical relics of various types, sizes, shapes, and materials, an integrated, compact, multi-scale, multimodal image information acquisition system for cultural relics, including visual (patterns, textures, colors), material, and 3D information, needs to be designed to balance the macro-holistic and micro-local requirements of cultural relic information acquisition, and to ensure that local 3D geometric information of the surface of the cultural relic can be perceived when necessary. Addressing the need for efficient integrated acquisition of multimodal image information in cultural relic digital information acquisition, this invention proposes a compact, multi-scale, integrated digital information acquisition system for multimodal imagery of cultural relics, suitable for applications such as cultural relic protection, restoration, monitoring, and management.

[0018] See Figure 1 and Figure 2 This invention provides a lightweight, multi-scale, multi-modal image digital information acquisition system for cultural relics, comprising a housing. Inside the housing are integrated a multi-scale observation imaging lens group, a micro-on-chip coated composite filter spectral imaging module, and a multi-scale adjustment and control module, with an externally connected multi-modal image data processing module. An integrated spectral light source is located at the front end of the housing. 1. Multiscale observation imaging array.

[0019] The multi-scale observation imaging lens group is an optical imaging lens group based on the principle of optical fixed focus. It is used to achieve high-performance observation imaging at different spatial scales and can provide corresponding imaging magnification, imaging spatial resolution and corresponding field of view at different object distances.

[0020] In one embodiment of the present invention, the design specifications of the multi-scale observation imaging lens group are shown in Table 1.

[0021] Table 1. Design values ​​of technical specifications for the multi-scale observation imaging array.

[0022] Based on the above design specifications, when the object distance of the multi-scale observation imaging lens group is about 50mm, its highest spatial resolution is 4μm@50mm; at the same time, at an object distance of 900mm, its spatial resolution is 47.7μm, and its field of view diagonal is 105mm, which can meet the requirements of close-range microscopic observation and long-range macroscopic observation with a large field of view.

[0023] 2. Miniature on-chip coated composite filter spectral imaging module.

[0024] The core of the micro-on-chip coated composite filter spectral imaging module is an integrated CCD / CMOS camera detector chip. A spectral composite filter film is deposited on the surface of the camera chip to achieve filtering of spectral signals of different wavelengths at different pixels of the camera chip according to specific transmittance levels. Photosensitive imaging is then performed using a rear imaging module and the camera chip. In one embodiment of this invention, the parameters of the camera chip are as follows: Detector array pixel count: 1920×1080; detector pixel size: 2.1μm×2.1μm; detector array size: 4.032mm×2.268mm.

[0025] At this point, the spectral composite filter film on the surface of the camera chip is composed of filter film units. The area of ​​the spectral composite filter film should be greater than 4.032mm × 2.268mm, and the size of a single filter film unit is 2.1μm × 2.1μm. A 3×3 composite coating filter is applied cyclically in both the horizontal and vertical dimensions on the camera chip surface. That is, each pixel block consists of 3×3 detector pixels, and the filter film unit on each detector pixel within the pixel block achieves a defined coating filter response. Since the same coating filter film is applied repeatedly to pixel blocks, corresponding to the same composite filter response, 640×360 composite filter blocks with identical composite filter responses can be obtained on the camera chip. Figure 3 As shown.

[0026] Since the composite filter film of each pixel block completes the composite filtering of the spectral signals of its corresponding 3×3 detector pixels, the spectral image data of each pixel block can be obtained by calculating the composite filtered data of the spectral signals of each pixel block through the spectral reconstruction algorithm; and the spectral image data of all coated composite filter blocks can be obtained by calculating the composite filtered data of the spectral signals of all pixel blocks, totaling (640×3)×(360×3)=1920×1080 pixels of spectral image data.

[0027] 3. Cross-scale adjustment and control module.

[0028] The cross-scale adjustment control module includes a high-resolution stepper motor and a high-precision lead screw, wherein: The multi-scale observation imaging mirror assembly is fixed to the first support within the housing, while the on-chip coated composite filter spectral imaging module is mounted on the second support within the housing via a lead screw guide rail, with their optical axes coinciding. A stepper motor drives the on-chip coated composite filter spectral imaging module to move back and forth on the guide rail via a lead screw, thereby achieving changes in the back intercept between the multi-scale observation imaging mirror assembly and the micro-on-chip coated composite filter spectral imaging module, thus realizing multi-scale changes in imaging spatial resolution and multi-scale imaging observation. Figure 4 As shown in Table 2, in one embodiment of the present invention, the observation distance corresponding to the back intercept adjustment between the actual multi-scale observation imaging mirror group and the micro-on-chip coated composite filter spectral imaging module is shown in Table 2.

[0029] Table 2 System back intercept adjustment for different observation distances

[0030] 5. Integrated spectral light source.

[0031] The integrated spectral light source is installed around the front end of the multi-scale observation imaging mirror assembly and is located at the front end of the housing. The integrated spectral light source is composed of multiple low-temperature spectral LEDs with emission wavelengths covering the visible and near-infrared spectral bands, integrated in a ring structure. Each LED can be independently controlled in terms of brightness and on / off state through a corresponding switch control unit.

[0032] In one embodiment of the present invention, the parameters of a single LED bead are as follows: Forward current (maximum rated): 20.0 mA; Peak forward current (maximum rated): 60.0 mA; Luminous flux: 10-15 μm; Color temperature: 4000 K; Reverse voltage: 11 V; Forward voltage: 8-9 V; Peak temperature: 260 °C; Power: approximately 0.2-1 W.

[0033] Figure 5 The image shows a spectral integrated light source obtained by integrating eight low-temperature spectral LED beads in a ring structure.

[0034] 6. Multimodal spectral data processing module.

[0035] The multimodal spectral data processing module is connected to the microchip-based coated composite filter spectral imaging module, which includes a multispectral image reconstruction module under composite filtering, a color image synthesis module, and a local 3D geometric image representation module. Among them: The multispectral image reconstruction module performs calculations based on the original grayscale image data output by the micro-on-chip coated composite filter spectral imaging module, and reconstructs the multispectral image data using a spectral reconstruction algorithm (such as the generalized least squares spectral reconstruction algorithm). The color image synthesis module synthesizes a color image using three wavelength image data selected from the multispectral image data, namely red (image data within 720-660nm averaged by spectral band), green (image data within 530-590nm averaged by spectral band), and blue (image data within 420-480nm averaged by spectral band), according to the pseudo-color synthesis method. The local 3D geometric image representation module controls the switching of different LED beads in the integrated spectral light source through the switch control unit, and acquires synthetic color images under different lighting conditions. It then uses the photometric stereo method to calculate the representation image of the local 3D geometric information of the artifact surface through normals.

[0036] Based on the above technical solutions, the present invention further provides a method for integrated acquisition of digital information of multimodal maps of lightweight, multi-scale cultural relics, such as... Figure 6 As shown, it includes: For acquiring information about cultural relics, the integrated digital information acquisition system for multimodal images of small-scale cultural relics is moved to a predetermined distance (e.g., 150cm) and positioned directly opposite the cultural relic beforehand, and then information is collected at a macroscopic location. All LEDs in the integrated spectral light source are turned on to provide illumination. The position of the microchip-coated composite filter spectral imaging module is adjusted using the cross-scale adjustment control module (the movement distance in this embodiment is 15.98 mm) to achieve system focusing and ensure clear imaging. Then, image data is acquired using the rear imaging module and camera chip. The acquired grayscale image is reconstructed using the multispectral image reconstruction module in the multimodal spectral data processing module to obtain a multispectral image. The multispectral image is processed using the color image synthesis module to obtain a color image under full illumination conditions. Then, control all the LED beads of the integrated spectral light source to turn on the switches in sequence, and adjust the exposure time of the rear imaging module and camera chip; under the illumination conditions when the LED beads are turned on in each direction, image data corresponding to different directions are collected, and the multimodal spectral data processing module is used to process and obtain color images under different illumination conditions; finally, the local 3D geometric image representation module combines the color images under full illumination conditions and uses the color images under all different illumination conditions to perform normal calculations to obtain the normal representation image of local 3D geometric information; After the above process is completed, the system is adjusted to a preset microscopic close distance (e.g., 10cm) from the cultural relic. The back intercept is adjusted through the cross-scale observation control module, and the focus is completed (the moving distance in this embodiment is 6.6mm). The exposure time is adjusted and the clarity of the acquired image is tested. Then, the information acquisition at the microscopic close distance is achieved by using the same method as the information acquisition at the macroscopic position. By adjusting different microscopic proximity distances and collecting information at each microscopic proximity position, multispectral reconstructed images, synthetic color images, and normal representation images of local 3D geometry at macroscopic positions and multiple microscopic proximity positions are obtained, thereby completing the integrated acquisition of complete cross-scale multimodal map digital information.

[0037] The lightweight, multi-scale, multimodal image digital information integrated acquisition system designed in this invention can be applied to various scenarios such as cultural relic protection, restoration, monitoring, and management. It can acquire complete global macroscopic multimodal data and local microscopic multimodal data of cultural relics according to the aforementioned standard data acquisition process, and can also be used independently for multimodal data acquisition at specific observation scales. Furthermore, due to its lightweight and compact design, it can be integrated and used in different modes such as robotic arms, gimbals, drones, or handheld devices. The acquired multimodal data can be used to analyze and determine the current state of damage, material composition, craftsmanship, and degradation of cultural relics; or to monitor the development of damage and restoration effects; or for the registration and identification management of cultural relics.

[0038] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A lightweight, multi-scale, multimodal image digital information acquisition system for cultural relics, characterized in that: The system includes a housing, which integrates a multi-scale observation imaging mirror group, a micro-on-chip coated composite filter spectral imaging module, and a multi-scale adjustment and control module. An external multi-modal spectral data processing module is also connected. An integrated spectral light source is located at the front end of the housing. Among these components: The cross-scale observation imaging lens group is an optical imaging lens group based on the principle of optical fixed focus. It is used to achieve high-performance observation imaging at different spatial scales and can provide corresponding imaging magnification, imaging spatial resolution and corresponding field of view at different object distances. The core of the micro-on-chip coated composite filter spectral imaging module is an integrated camera detector chip. A spectral composite filter film is coated on the surface of the camera chip to achieve filtering of spectral signals of different wavelengths at different pixels of the camera chip according to specific different transmittances. The rear imaging module and the camera chip are then used to complete the photosensitive imaging. The cross-scale adjustment control module includes a high-resolution stepper motor and a high-precision lead screw. The motor rotation drives the lead screw rotation, thereby realizing the back intercept adjustment between the miniature on-chip coated composite filter spectral imaging module on the lead screw guide rail and the cross-scale observation imaging mirror group. The integrated spectral light source is installed around the front end of the multi-scale observation imaging lens group and is located at the front end of the housing; the integrated spectral light source is composed of multiple low-temperature spectral LEDs with emission wavelengths covering the visible and near-infrared spectral bands integrated in a ring structure; The multimodal image data processing module is connected to the on-chip coating composite filter spectral imaging module. It includes a multispectral image reconstruction module under composite filtering, a color image synthesis module, and a local 3D geometric image representation module. The multispectral image reconstruction module calculates based on the original grayscale image data output by the on-chip coating composite filter spectral imaging module and reconstructs multispectral image data using a spectral reconstruction algorithm. The color image synthesis module performs color image synthesis based on the multispectral image data. The local 3D geometric image representation module is used to generate images representing the local 3D geometric information of the artifact surface.

2. The lightweight, multi-scale, multi-modal cultural relic digital information integrated acquisition system according to claim 1, characterized in that, The spectral composite filter film on the surface of the camera chip is composed of filter film units. The area of ​​the spectral composite filter film should be larger than the detector array area of ​​the camera chip, and the size of a single filter film unit matches the detector pixel size. A 3×3 composite coating filter is cyclically applied to the horizontal and vertical dimensions of the camera chip surface. Every 3×3 detector pixels form a pixel block. The filter film unit on each detector pixel in the pixel block achieves a defined coating filter response. The same composite filter film is applied repeatedly to different pixel blocks, corresponding to the same coating filter response. This results in multiple coated composite filter blocks on the camera chip with the same filter response.

3. The lightweight, multi-scale, multi-modal image digital information acquisition system for cultural relics according to claim 1, characterized in that, Each pixel block's composite filter film performs composite filtering of the spectral signals of its corresponding 3×3 detector pixels. By calculating the composite filtered data of the spectral signals of each pixel block using a spectral reconstruction algorithm, the spectral image data of each pixel block can be obtained. By calculating the composite filtered data of the spectral signals of all pixel blocks, the spectral image data of all coated composite filter blocks can be obtained.

4. The lightweight, multi-scale, multi-modal image digital information acquisition system for cultural relics according to claim 1, characterized in that, The multi-scale observation imaging mirror group is fixed on the first support inside the housing, while the micro-on-chip coated composite filter spectral imaging module is mounted on the second support inside the housing via a lead screw guide rail, with their optical axes coinciding. A stepper motor drives the micro-on-chip coated composite filter spectral imaging module to move back and forth on the guide rail via a lead screw, so as to realize the back intercept change between it and the multi-scale observation imaging mirror group, thereby realizing the multi-scale change of imaging spatial resolution and multi-scale imaging observation.

5. The lightweight, multi-scale, multi-modal image digital information acquisition system for cultural relics according to claim 1, characterized in that, In a spectrum-integrated light source, each LED bead can be independently controlled for its brightness and on / off state through a corresponding switch control unit.

6. The lightweight, multi-scale, multi-modal image digital information acquisition system for cultural relics according to claim 1, characterized in that, The color image synthesis module synthesizes a color image using three wavelength image data selected from the corresponding red, green, and blue wave ranges in the multispectral image data, following a pseudo-color synthesis method.

7. The lightweight, multi-scale, multi-modal image digital information acquisition system for cultural relics according to claim 1, characterized in that, The local 3D geometric image representation module controls the switching of different LED beads in the spectral integrated light source through the switch control unit, and acquires the synthetic color image under different directional lighting conditions. Then, it uses the photometric stereo method to calculate the representation image of the local 3D geometric information of the artifact surface through normals.

8. A method for integrated acquisition of digital information of multimodal maps of lightweight, small-scale, multi-scale cultural relics, characterized in that... include: For acquiring multimodal information about cultural relics, the lightweight, multi-scale, integrated digital information acquisition system for multimodal images of cultural relics is pre-positioned at a predetermined distance and directly facing the cultural relics, and then information is collected at a macroscopic location. The system activates all LEDs in the integrated spectral light source to provide illumination. The position of the on-chip coated composite filter spectral imaging module is adjusted using a cross-scale adjustment control module to achieve system focusing and ensure clear imaging. Image data is then acquired using a rear imaging module and camera chip. The acquired grayscale image is reconstructed using the multispectral image reconstruction module in the multimodal spectral data processing module to obtain a multispectral image. The multispectral image is then processed using a color image synthesis module to obtain a color image under full illumination conditions. Then, all LED beads of the integrated spectral light source are controlled and their switches are turned on in sequence, and the exposure time of the rear imaging module and camera chip is adjusted. Under the illumination conditions when the LED beads are turned on in each direction, the corresponding image data in that direction is collected and processed by the multimodal spectral data processing module to obtain color images under different illumination conditions. Finally, the local 3D geometric image representation module combines the color images under full illumination conditions and uses the color images under all different illumination conditions to perform normal calculations to obtain the normal representation image of local 3D geometric information. After the above process is completed, the system is adjusted to a preset microscopic close distance from the cultural relic. The back intercept is adjusted through the cross-scale observation control module, and the focus is completed. The exposure time is adjusted and the clarity of the acquired image is tested. Then, the information is acquired at the microscopic close distance using the same method as the information acquisition at the macroscopic position. By adjusting different microscopic proximity distances and collecting information at each microscopic proximity location, multispectral reconstructed images, synthetic color images, and normal representation images of local 3D geometry at macroscopic locations and multiple microscopic proximity locations are obtained, thereby completing the integrated acquisition of complete cross-scale multimodal map digital information.

Images