A two-dimensional high-definition scanning system and scanning method

Abstract

This application provides a two-dimensional high-definition scanning system and scanning method. The scanning system includes a camera unit A, an illumination unit B, and a control unit. The illumination unit cooperates with the camera unit and moves relative to the object to be scanned along the scanning direction. The illumination unit includes n linear light sources, each of which is fixedly equipped with a light path shaping optical element, forming n sets of "light source-optical element" combinations. The light path shaping optical elements include directional light path shaping elements and / or diffuse light path shaping elements, which illuminate the scanning line at different angles. The control unit is electrically connected to the illumination unit and is used to control the conduction state of the n linear light sources through electronic switching, realizing millisecond-level switching of different "light source-optical element" combinations, dynamically adjusting the illumination parameters, and achieving coverage of multiple lighting scenes in a single scan, greatly improving the high definition and stereoscopic effect of the scanned image.

Description

Technical Field

[0001] This application relates to the field of scanning technology, specifically to a two-dimensional high-definition scanning system and scanning method, which is particularly suitable for scanning scenarios that require accurate capture of object texture details and surface texture depth information. Background Technology

[0002] A line scanner is an optical scanning device that uses a linear sensor rather than a rectangular sensor. In each acquisition cycle, the camera can digitize only one scan line of the object. The camera unit and illumination unit must move relative to the object along the scanning direction to acquire a complete image. As the core component of a line scanner, the illumination effect directly determines the sharpness, texture reproduction, and depth information capture accuracy of the scanned image, playing a crucial role in scan quality.

[0003] In existing technologies, lighting devices typically consist of one or more linear light sources, working in conjunction with light diffusers to achieve uniform light distribution along the scan lines, producing a diffuse reflection effect. However, this lighting method has limitations in scenarios requiring precise capture of object texture details, especially unsuitable for systems using photometric stereo methods to calculate object shapes—this method requires directional light sources, demanding that each beam of light precisely illuminates the scan line at the same incident angle. To meet the requirements of directional light sources, existing technologies propose two solutions: First, using detachable layered gratings, installed for directional illumination to absorb unsuitable light, and manually removed for diffuse illumination. This solution relies on manual interaction, the switching process is cumbersome, and large-scale automated scanning is impossible. Furthermore, the grating absorbs a large amount of emitted light and converts it into heat, resulting in significant light loss. Second, adding an additional lighting device with a fixed mounting grid next to the lighting unit to provide directional illumination. This solution requires additional equipment, increasing costs and is limited by space constraints.

[0004] Furthermore, existing technical document CN112815864A discloses an illumination mechanism for a stereoscopic information acquisition machine. This mechanism uses polarizing optical elements (microlenses or gratings) to change the direction of light, allowing objects to be illuminated by light from different angles to enhance the stereoscopic effect. However, this technology still has drawbacks: its polarizing optical elements need to be configured correspondingly to specific illumination components, and manual adjustment of the optical element's installation state is required when switching between different illumination modes, making automated and rapid switching impossible. Moreover, its optical elements still suffer from energy loss during light refraction or filtering, failing to address the need for low heat and high efficiency. Additionally, this technology struggles to dynamically switch between multiple illumination scenes in a single scan, limiting its scanning efficiency and adaptability.

[0005] In summary, the illumination devices of existing scanning systems generally suffer from the following four core technical problems: ① Illumination mode switching relies on manual intervention: Whether it is a detachable grating solution or a solution that requires adjustment of the installation status of optical components, manual operation is required, which cannot achieve automated continuous scanning, resulting in low efficiency and difficulty in meeting the needs of large-scale scanning. ② High hardware configuration costs and limited space: Some solutions require additional lighting components, which increases hardware costs, places higher demands on installation space, has poor compatibility, and is not conducive to upgrading and modifying existing equipment; ③Severe loss of light energy and thermal effects: Light filtering structures such as layered gratings and fixed grids absorb a large amount of emitted light, which on the one hand causes light loss and reduces lighting efficiency, and on the other hand, the absorbed light is converted into heat energy, which will affect the service life of the internal electronic components of the equipment in the long term. ④ Limited scanning adaptability and accuracy: A single scan cannot achieve dynamic switching between multiple lighting scenarios. It can only provide diffuse lighting and cannot capture depth information, or it can only provide directional lighting from a single angle, making it difficult to fully restore the texture details and three-dimensional shape of the object. The scanning adaptability is poor and the accuracy cannot meet the needs of high-end applications.

[0006] Therefore, there is an urgent need for a two-dimensional high-definition scanning system and scanning method that can solve the problems of manual intervention, cost and space constraints, heat generation from light absorption, and poor adaptability to scanning scenarios in existing technologies. Summary of the Invention

[0007] The purpose of this application is to overcome the shortcomings of the prior art and provide a two-dimensional high-definition scanning system and scanning method that can achieve automated, low-heat, high-efficiency, and high-precision scanning.

[0008] To achieve the above technical objectives, one embodiment of this application provides a two-dimensional high-definition scanning system, including a camera unit A, an illumination unit B, and a control unit. The camera unit A is equipped with a linear sensor for digitizing a scan line G of an object C to be scanned in each acquisition cycle. The scan line G is a straight line on the object C parallel to the linear sensor. The illumination unit B cooperates with the camera unit A and moves relative to the object C along the scanning direction, which is orthogonal to the linear sensor. The illumination unit B includes n linear light sources E1-En, where n is a positive integer greater than or equal to 1. Each linear light source is fixedly equipped with an optical path shaping element, forming n sets of "light source-optical element" combinations. The shaping optical element is structurally compatible with the existing illumination unit B, and the illumination unit B does not have a layered grating or fixed grid for absorbing light, thus avoiding energy loss and heat generation caused by light absorption; the optical path shaping optical element is used to shape the path of the light emitted by the corresponding linear light source, and the optical path shaping optical element includes a directional optical path shaping optical element and / or a diffuse optical path shaping optical element: the directional optical path shaping optical element guides the light from the corresponding linear light source to the scan line G through refraction or diffraction, and the light illuminates the scan line G at a preset incident angle α (0°<α<90°); the diffuse optical path shaping optical element allows the light from the corresponding linear light source to intersect the scan line G at multiple different angles to form a diffuse illumination effect; The control unit is electrically connected to the lighting unit B and is used to control the conduction state of n linear light sources through electronic switching to achieve switching of different "light source-optical element" combinations. The electronic switching response speed of the control unit is in the millisecond range, and it can complete the switching of different lighting scenes without manual intervention. In addition, it dynamically adjusts the lighting parameters in each acquisition cycle so that the object C to be scanned is illuminated by multiple different lighting scenes in a single scan.

[0009] Furthermore, the illumination parameters include at least one of the following: selection of the activated linear light source; the incident angle α of the light illuminating the scan line G, which is achieved by switching the linear light sources corresponding to different directional optical path shaping optical elements; and selection of an illumination mode including directional illumination or diffuse illumination, wherein the directional illumination is the light source corresponding to the activated directional element, and the diffuse illumination is the light source corresponding to the activated diffuse element.

[0010] Furthermore, the optical path shaping optical element is fixedly installed in front of the light-emitting side of the corresponding linear light source by means of a snap or bolt.

[0011] Furthermore, there are at least two directional optical path shaping optical elements, and the preset incident angles α corresponding to different directional optical path shaping optical elements are different. At least two directional optical path shaping optical elements are respectively fixedly installed at the top and bottom of the illumination unit along the height direction.

[0012] Furthermore, the electronic switching response time of the control unit is 1-10 milliseconds.

[0013] Furthermore, the linear light source is an LED light bar, and the light emission direction of the LED light bar is towards the scan line G; n linear light sources E1-En are arranged sequentially along the height direction of the lighting unit B.

[0014] Correspondingly, this application also provides a two-dimensional high-definition scanning method, applied to the above-mentioned two-dimensional high-definition scanning system, including the following steps: S1: Start scanning, causing camera unit A and illumination unit B to move synchronously relative to the object C to be scanned along the scanning direction; S2: The control unit activates the preset "light source-optical element" combination in the lighting unit B through electronic switching, so that the light emitted by the corresponding linear light source is shaped by the optical path shaping optical element and illuminates the scan line G of the object to be scanned C with the preset lighting scene. S3: The linear sensor of camera unit A digitizes the image data of scan line G during the current acquisition cycle; S4: The control unit dynamically adjusts the lighting parameters during subsequent acquisition cycles, switches to different combinations of "light source-optical elements" to form new lighting scenes, and the switching response time is in the millisecond range. No manual disassembly or installation of any optical components is required. Repeat step S3 until the image data acquisition of all scan lines G is completed. S5: Combine the image data of all acquired scan lines G to obtain a complete high-definition image of the object C to be scanned.

[0015] Furthermore, in step S4, the dynamically adjusted lighting parameters include the incident angle α and / or the lighting mode, which switches between directional lighting and diffuse lighting.

[0016] Compared with the prior art, this application has the following significant advancements: ① Achieve automated scanning without human intervention: Through the millisecond-level electronic switching technology of the control unit, the rapid switching of different lighting scenarios can be completed without the need for manual disassembly or installation of optical components, solving the problems of cumbersome manual operation and inability to perform large-scale automated scanning in the existing technology, and greatly improving scanning efficiency; ② Compatible with existing equipment and cost-controllable: The optical path shaping optical element is perfectly compatible with the existing illumination unit B, without the need for additional illumination devices, avoiding additional cost investment and space limitations, and adapting to the upgrade and transformation of existing scanning equipment; ③ High efficiency and energy saving with low heat loss: The lighting unit B does not have any layered gratings or fixed grids for absorbing light. Through the directional guidance or diffusion design of the optical path shaping optical elements, the light loss caused by light absorption is avoided, and the heat generation is significantly reduced, achieving high efficiency and energy saving, and will not have a thermal impact on the scanned object and equipment. ④ Significantly improved scanning accuracy and adaptability: By dynamically adjusting lighting parameters such as light source selection, incident angle, and lighting mode, a single scan can cover multiple lighting scenarios. This not only meets the requirements of photometric stereo method for directional light sources and accurately captures the surface texture depth information of objects, but also achieves uniform illumination through diffused lighting, clearly presenting the overall shape of objects. This greatly improves the high definition and stereoscopic effect of scanned images, adapting to the scanning needs of various objects with surface texture undulations, such as wood grain, stone grain, and relief murals. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the two-dimensional high-definition scanning system in the embodiments of this application; Figure 2 This is a side view of a portion of the structure of the two-dimensional high-definition scanning system in an embodiment of this application; Figure 3 This is a top view of a portion of the two-dimensional high-definition scanning system in an embodiment of this application; Figure 4 This is a flowchart of the scanning method in an embodiment of this application.

[0018] Figure label: A - Camera unit; B - Illumination unit; C - Object to be scanned; D - Line of sight; E1-E5 - Linear light source; F1-F5 - Optical elements for shaping the light path; G - Scan line; H - Light ray; α1-α2 - Incident angle; 1-Base; 11-Mobile worktable; 12-Vertical frame; 13-Support arm; 2-Control unit. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-4 The present application provides a detailed description of its two-dimensional high-definition scanning system and scanning method, including specific embodiments, so that those skilled in the art can clearly and completely understand and implement the technical solution of the present application.

[0020] It should be noted that the following embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application. Any conventional modifications, equivalent substitutions, or improvements made based on the technical solutions of this application without departing from the inventive concept of this application should be included within the scope of protection of this application. Technical features not explicitly defined in these embodiments can be implemented using existing technology and will not affect the realization of the core technical effects of this application.

[0021] Example 1 like Figure 1 As shown, the two-dimensional high-definition scanning system of this embodiment includes a camera unit A, an illumination unit B, a control unit 2, and a base 1. A movable worktable 11 is slidably mounted on the base 1, and a vertical frame 12 is mounted on one side of the base 1. A support arm 13 is horizontally mounted on the vertical frame 12, with the extension direction of the support arm 13 facing one side of the movable worktable 11. The camera unit A is mounted on the support arm 13, and one end of the illumination unit B is fixedly mounted on the vertical frame 12, located on both sides below the support arm 13. The object C to be scanned is placed on the upper surface of the movable worktable 11. The control unit 2 is electrically connected to the camera unit A, the illumination unit B, and the movable worktable 11 through wires to realize the coordinated control of the entire system.

[0022] The movable stage 11 can reciprocate along its length direction (i.e., the scanning direction), causing the object C to be scanned to move relative to the camera unit A and the illumination unit B. The scanning direction is orthogonal to the length direction of the linear sensor in the camera unit A, ensuring that all scan lines G collected by the camera unit A can uniformly cover the entire surface of the object C to be scanned, laying the foundation for complete image synthesis.

[0023] In this embodiment, the control unit 2 uses an STM32 series microcontroller. It is electrically connected to the n linear light sources (E1-En) of the lighting unit B through an electronic switching circuit. Its electronic switching response time is 3 milliseconds, but it can also be set to other values ​​less than 10 milliseconds depending on the actual situation. The on and off of each linear light source can be controlled by a preset program to achieve rapid switching of different combinations of "light source-optical elements".

[0024] Millisecond-level electronic switching completely eliminates the reliance on manual intervention in existing technologies. Without the need for manual disassembly of gratings or adjustment of optical component installation, the switching of lighting scenes can be completed within each acquisition cycle, achieving automated continuous scanning and significantly improving scanning efficiency. For example, for a 1m×1m object to be scanned, a single scan can be completed within 5 minutes, while existing technologies require an additional 30 minutes of operation time for manual switching of lighting modes, meeting the needs of large-scale batch scanning. The 1-10 millisecond response time perfectly matches the acquisition cycle of camera unit A (typically 3-10 milliseconds per scan line). The control unit can immediately switch the lighting scene after the camera has acquired image data for one scan line, ensuring that the acquisition of the next scan line is performed in the new lighting mode, avoiding image blurring or scene loss caused by asynchronous lighting switching and acquisition. Furthermore, through program presets, the control unit can flexibly adjust lighting parameters, including the activated linear light source, incident angle α, and lighting mode, to achieve personalized configuration of the lighting scene. For example, for relief-like objects, the number of directional lighting switches can be increased to enhance depth information; for planar textured objects, the proportion of diffuse lighting can be increased to improve overall clarity and enhance the scanning adaptability of the system.

[0025] like Figure 2 , 3 As shown, the camera unit A is equipped with a high-precision linear sensor (not shown). The length direction of the linear sensor is parallel to the scan line G on the object to be scanned C. In each acquisition cycle, the optical signal of the scan line G is accurately captured through the line of sight D and digitized into image data. The parallel relationship between the linear sensor and the scan line G ensures that the acquired scan line is free from distortion and offset, providing a pixel-level alignment basis for the subsequent stitching and synthesis of multiple scan lines, which is a prerequisite for realizing high-definition scanning.

[0026] The lighting unit B is the core component of this application in addressing the deficiencies of the prior art. It directly determines the lighting effect, scanning efficiency, and energy-saving performance, as detailed below: like Figure 2 , 3 As shown, the lighting unit B includes n linear light sources. In this embodiment, n is preferably, but not limited to, 5, i.e., E1-E5. All linear light sources are LED light bars, which are arranged sequentially and uniformly along the height direction of the lighting unit B. The light emission direction of the LED light bars is all towards the scanning line G of the object C to be scanned.

[0027] The linear light source in this embodiment uses an LED light array, which has the characteristics of low energy consumption, stable light emission, and low heat generation. Compared with traditional light sources, it can significantly reduce the overall energy consumption of the system, while reducing the impact of its own heat generation on the scanning environment and preventing the object to be scanned (such as thermal paper or fabric) from deforming due to high temperature. Furthermore, the sequential arrangement along the height direction provides a physical space basis for setting different incident angles α. Linear light sources at different heights, together with corresponding optical path shaping optical elements, can naturally form illumination light at different angles without occupying additional lateral space. The light emission direction of all light sources is towards the scanning line G, ensuring that the light is concentrated on the acquisition area, avoiding the waste of light energy caused by light scattering, and improving illumination efficiency.

[0028] Each linear light source (E1-E5) has a light path shaping optical element (F1-F5) fixedly installed in front of the light-emitting side by a snap-fit, forming 5 independent "light source-optical element" combinations, and the overall structure of the lighting unit B does not require any layered gratings or fixed grids for absorbing light.

[0029] The "light source-optical element" combination in this application embodiment achieves perfect compatibility between the optical path shaping optical element and the LED light bar through a simple snap-fit ​​fixing installation method—no major modifications to the existing lighting unit structure are required; upgrades can be made simply by adding optical elements, reducing equipment modification and production costs. More importantly, by eliminating layered gratings and fixed grids, light energy loss caused by light absorption is avoided at the source, allowing the light emitted by the LED light bar to act on the scanning line G to the maximum extent, significantly improving lighting efficiency. At the same time, no light absorption means no large amount of heat energy is generated, avoiding accelerated aging of internal electronic components due to heat energy during long-term use, and also avoiding deformation and damage caused by heat energy conduction to the object to be scanned, thus achieving the scanning requirements of low heat and high efficiency.

[0030] The optical path shaping optical element in this embodiment includes a directional optical path shaping optical element and a diffuse optical path shaping optical element. The two types of elements work together to achieve coverage of various lighting scenarios: like Figure 2 As shown, in this embodiment, the optical path shaping elements are taken as n=5, i.e., F1-F5, and are respectively set to correspond to linear light sources E1-E5; wherein, the directional optical path shaping elements are preferably not limited to two, namely F1 and F5, wherein F1 is fixedly installed at the top of the illumination unit B along the height direction and corresponds to the linear light source E1, with light entering from the upper left corner; F5 is fixedly installed at the bottom of the illumination unit B along the height direction and corresponds to the linear light source E5, with light entering from the lower left corner. Each directional element shapes the path of the light from the corresponding LED light array through refraction or diffraction, so that the light accurately illuminates the scan line G at a preset incident angle α (0°<α<90°), and the incident angles α corresponding to the two directional elements are different from each other, combined with Figure 3 As shown, F1 corresponds to |α1|=30°, and |α5|=35° for F5. The top and bottom directional elements form the largest difference in incident angle, which can cover the reflection characteristics of most of the surface texture of the object; of course, depending on the actual situation, directional optical path shaping optical elements can also be set in the middle to supplement the reflection data of the middle angle, so that the acquisition of depth information is more comprehensive and delicate, and the stereo effect of the scanned image is significantly improved.

[0031] The arrangement of multiple directional optical path shaping elements in this embodiment enables precise control of the incident angle, fulfilling the core requirement of photometric stereochemistry for directional light sources. Photometric stereochemistry calculates the three-dimensional depth information of an object by analyzing the differences in reflection of directional light rays from different angles on the object's surface. The setting of multiple different directional incident angles α in this application allows for the acquisition of reflection data of light rays from multiple angles on the object's surface in a single scan, thereby accurately reproducing the texture depth of the object's surface, such as the grooves of wood grain, the undulations of relief carvings, and the uneven texture of stone.

[0032] In this embodiment, the optical path shaping optical elements corresponding to the other three lines of light between F1 and F5 are diffuse optical path shaping optical elements, namely F2, F3, and F4. They have a microstructure diffusion layer inside, which allows the light emitted by the corresponding linear light source to intersect the scan line G at multiple different angles, making the light more diffuse and evenly distributed on the entire scan line. However, these lights come from different tilt angles, forming a uniform diffuse illumination effect.

[0033] The multiple diffuse optical path shaping optical elements in this embodiment serve to eliminate local shadows that may be produced by directional illumination. For example, fine depressions on the surface of an object may form shadows under directional illumination, resulting in loss of detail. However, the uniform light from diffuse illumination can fill in the shadow areas, clearly revealing the texture details inside the depressions. The uniformity of diffuse illumination ensures the clear presentation of the overall shape of the object, complementing directional illumination. Directional illumination is responsible for capturing depth information, while diffuse illumination is responsible for presenting the overall outline and uniform texture. The combination of the two gives the scanned image both a sense of three-dimensional depth and overall clarity, adapting to the scanning needs of various complex surface textures.

[0034] Example 2 like Figure 4 As shown, the scanning method of this embodiment is applied to the two-dimensional high-definition scanning system in Embodiment 1 above, and the specific steps are as follows: S1: Start scanning, so that the camera unit and the illumination unit move synchronously relative to the object to be scanned along the scanning direction; Specifically, the operator places the object to be scanned, C, such as a wooden board with a three-dimensional embossed texture, at the center of the mobile worktable 11 and starts the scanning program via the touch panel of the control unit 2. The control unit 2 issues a command to control the mobile worktable 11 to move at a preset speed along the scanning direction, orthogonal to the linear sensor of the camera unit A. At the same time, the camera unit A and the illumination unit B remain fixed with the vertical frame 12, achieving synchronous movement of both relative to the object to be scanned, C. This synchronous movement ensures that the scan lines G acquired by the camera unit A each time are parallel and evenly spaced, avoiding image stitching misalignment caused by asynchronous movement, and providing a spatial reference for the synthesis of a complete high-definition image.

[0035] For the illumination unit and camera unit to move relative to the object to be scanned C (moving stage) along the scanning direction, the specific movement methods include the illumination unit and camera unit remaining stationary while the moving platform moves, or the moving platform remaining stationary while the illumination unit and camera unit move, or the illumination unit, camera unit, and moving platform all moving, etc.

[0036] S2: The control unit activates the preset "light source-optical element" combination in the lighting unit through electronic switching, so that the light emitted by the corresponding linear light source is shaped by the optical path shaping optical element and illuminates the scan line of the object to be scanned with the preset lighting scene. Specifically, according to a preset program, the control unit 2 first activates the linear light source E3 corresponding to the diffuse optical path shaping optical element F3 to form a diffuse lighting scene. The light emitted by E3 is shaped by the microstructure diffusion layer of F3 and then uniformly illuminates the first scan line G of the object to be scanned C at multiple angles. Then, the linear light source E4 corresponding to the diffuse optical path shaping optical element F4 is activated quickly in milliseconds to form a new diffuse lighting scene. The light emitted by E4 is shaped by the microstructure diffusion layer of F4 and then uniformly illuminates the first scan line G of the object to be scanned C at multiple angles. The preset diffuse lighting can quickly obtain the overall outline and basic surface texture of the object, providing a reference for the depth information captured by subsequent directional lighting, and avoiding the overall shape distortion that may be caused by single directional lighting.

[0037] S3: The linear sensor of the camera unit digitizes the image data of the scan line during the current acquisition cycle; Specifically, the linear sensor of camera unit A responds to the acquisition command of control unit 2 and captures the optical signal of scan line G under diffuse illumination through line of sight D during the current acquisition cycle. It then digitizes the signal into high-definition image data of preset pixels. This data is transmitted to the storage module of control unit 2 in real time for temporary storage. The high-precision linear sensor ensures that the digitized image data can restore the fine texture of the wood surface, providing a clear detail basis for subsequent synthesis.

[0038] S4: The control unit dynamically adjusts the lighting parameters during subsequent acquisition cycles, switching to different combinations of "light source-optical elements" to form new lighting scenes. The response time of the control unit in switching the combination of "light source-optical elements" is in the millisecond range, and no manual disassembly or installation of any other optical components is required. Step S3 is repeated until the image data acquisition of all scan lines is completed. Specifically, control unit 2 dynamically adjusts the lighting parameters during subsequent acquisition cycles, switching to different combinations of "light sources-optical elements" to form new lighting scenes. For example, it can immediately shut down E4 via an electronic switching circuit and sequentially activate the linear light sources E1 and E5 corresponding to the directional optical path shaping optical elements. The switching response time is 3 milliseconds, requiring no manual operation of the optical components. When the directional optical path shaping optical element E1 of one side of the lighting unit B is activated, the light is shaped by F1 and illuminates the first scan line G at an incident angle of α1=30° at the upper left corner. Camera unit A acquires the depth texture data of one side at this angle. When the directional optical path shaping optical element E1 of the other side of the lighting unit B is activated, camera unit A acquires the depth texture data of one side at this angle. Similarly, when switching to activate E2, the light emitted by E2 is shaped by the microstructure diffusion layer of F2 and then evenly illuminates the first scan line G of the object to be scanned C at multiple angles to collect detailed data of the transition area; when quickly switching to activate E5, the light is shaped by F5 and then illuminates the first scan line G at another incident angle to collect other side contour depth data of the relief. Repeat the above switching logic until the image data acquisition of all scan lines of the object C to be scanned is completed. The millisecond-level switching ensures that each scan line can correspond to multiple lighting scenarios during the uniform movement of the moving worktable 11. A single scan can cover multi-dimensional image data of multiple diffuse lighting and directional lighting at different angles, which solves the problem of poor scanning image effect caused by the limitation of existing technologies that can only provide a single lighting scenario in a single scan.

[0039] S5: Combine the image data of all the acquired scan lines to obtain a complete high-definition image of the object to be scanned.

[0040] Specifically, the image processing module of control unit 2 calls a preset image stitching and synthesis algorithm to align and stitch together the multi-dimensional image data of all scan lines according to their spatial positions. Using the basic texture data acquired by diffuse illumination as the base map, the integrity of the overall shape of the object is ensured. Depth data acquired by directional illumination from other angles is superimposed on the base map, and three-dimensional texture information is generated by photometric stereo method to restore the height of the relief and the depth of the wood grain grooves. Finally, a complete high-definition image is synthesized, which greatly improves the texture reproduction and depth information capture accuracy of the image. It can be directly used for subsequent high-end applications such as digital modeling and printing replication. This effect fully reflects the core advantages of high-definition + stereoscopic in this application and solves the problems of missing details and poor stereoscopic effect in existing scanned images.

[0041] In summary, the embodiments of this application comprehensively solve the four core problems existing in the current scanning system through the above technical solutions, and the specific effects are as follows: ①Automated and without human intervention: The millisecond-level electronic switching technology of the control unit replaces the manual disassembly / installation of optical components in the existing technology, realizing automated and rapid switching of lighting scenes, greatly improving scanning efficiency and meeting the needs of large-scale batch scanning; ② Low cost and high compatibility: The optical path shaping optical components are compatible with existing LED light bars, eliminating the need for additional lighting devices, reducing equipment upgrade costs, and are not limited by installation space, allowing for direct adaptation to the transformation of existing line scanning equipment; ③ High efficiency, energy saving and low heat loss: It abandons the light absorption structure, improves lighting efficiency, avoids heat generation, extends the service life of the equipment, and can safely scan heat-sensitive objects; ④ High precision and wide adaptability: A single scan covers diffuse and multi-angle directional lighting scenes, which not only meets the depth information capture requirements of photometric stereo method, but also ensures the overall shape is clear. It can be adapted to scanning objects with various surface textures such as wood grain, stone grain, relief, mural, etc. The scanning accuracy and adaptability are significantly better than existing technologies.

[0042] The above embodiments are merely preferred embodiments of this application and are not intended to limit the technical solutions of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A two-dimensional high-definition scanning system, characterized in that, include: A camera unit, which is equipped with a linear sensor, is used to digitize a scan line of the object to be scanned in each acquisition cycle. The scan line is a straight line on the object to be scanned that is parallel to the linear sensor. An illumination unit is provided, which cooperates with the camera unit and moves relative to the object to be scanned along the scanning direction, which is orthogonal to the linear sensor. The illumination unit includes n linear light sources, each of which is fixedly equipped with a light path shaping optical element, forming n sets of "light source-optical element" combinations. The light path shaping optical element includes directional light path shaping elements and / or diffuse light path shaping elements, which illuminate the scanning line at different angles. The control unit is electrically connected to the lighting unit and is used to control the conduction state of the n linear light sources through electronic switching, thereby achieving the switching of different "light source-optical element" combinations.

2. The two-dimensional high-definition scanning system according to claim 1, characterized in that, The directional optical path shaping optical element guides the light from the corresponding linear light source to the scanning line through refraction or diffraction, and the light illuminates the scanning line at a preset incident angle α (0°<α<90°); The diffuse optical path shaping optical element allows light from a corresponding linear light source to intersect the scan line at multiple different angles, forming a diffuse illumination effect.

3. The two-dimensional high-definition scanning system according to claim 2, characterized in that, The electronic switching response speed of the control unit is at the millisecond level, which can complete the switching of different lighting scenes without manual intervention. Furthermore, it dynamically adjusts the lighting parameters in each acquisition cycle, so that the object to be scanned is illuminated by multiple different lighting scenes in a single scan.

4. The two-dimensional high-definition scanning system according to claim 3, characterized in that, The lighting parameters include at least one of the following: Selection of activated linear light sources; The incident angle α of the light illuminating the scan line is achieved by switching the linear light source corresponding to different directional optical path shaping optical elements; The lighting modes include directional lighting and diffuse lighting. The directional lighting is the light source corresponding to the directional optical path shaping element, and the diffuse lighting is the light source corresponding to the diffuse optical path shaping element.

5. The two-dimensional high-definition scanning system according to claim 1, characterized in that, The linear light source is an LED array, and the light emission direction of the LED array is towards the scan line.

6. The two-dimensional high-definition scanning system according to claim 1, characterized in that, The n linear light sources are arranged sequentially along the height direction of the lighting unit.

7. The two-dimensional high-definition scanning system according to claim 1, characterized in that, There are at least two directional optical path shaping optical elements, and the preset incident angle α corresponding to different directional optical path shaping optical elements is different. At least two directional optical path shaping optical elements are respectively fixedly installed at the top and bottom of the illumination unit along the height direction.

8. The two-dimensional high-definition scanning system according to claim 1, characterized in that, The electronic switching response time of the control unit is 1-10 milliseconds.

9. A two-dimensional high-definition scanning method, characterized in that, The method, applied to the two-dimensional high-definition scanning system according to any one of claims 1-8, comprises the following steps: S1: Start scanning, so that the camera unit and the illumination unit move synchronously relative to the object to be scanned along the scanning direction; S2: The control unit activates the preset "light source-optical element" combination in the lighting unit through electronic switching, so that the light emitted by the corresponding linear light source is shaped by the optical path shaping optical element and illuminates the scanning line of the object to be scanned with the preset lighting scene. S3: The linear sensor of the camera unit digitizes the image data of the scan line during the current acquisition cycle; S4: The control unit dynamically adjusts the lighting parameters during subsequent acquisition cycles, switching to different combinations of "light source-optical elements" to form new lighting scenes. The response time of the control unit in switching the combination of "light source-optical elements" is in the millisecond range, and no manual disassembly or installation of any other optical components is required. Repeat step S3 until the image data acquisition of all scan lines is completed. S5: Combine the image data of all the acquired scan lines to obtain a complete high-definition image of the object to be scanned.

10. The two-dimensional high-definition scanning method according to claim 9, characterized in that, In step S4, the dynamically adjusted lighting parameters include the incident angle α and / or the lighting mode, which switches between directional lighting and diffuse lighting.

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