Jade split processing and tracing method and system

Abstract

The application discloses a jade split processing and tracing method and system, and belongs to the technical field of jade processing and digital tracing. In view of the technical prejudice of the existing jade split processing technology, which takes "maximizing material yield" and "waste discarding" as the industry convention and ignores the "same origin" cultural experience, the application proposes a technical scheme of embedding cutting waste according to the original spatial distribution into a 3D printing replica to physically restore the integrity of the parent body. The method comprises the following steps: industrial CT scanning and outer surface scanning registration fusion, cutting path planning based on density field gradient and texture direction vector angle cosine absolute value maximization, establishment of a relative coordinate system with the unique identifiable reference feature point of the parent body as the origin (including auxiliary judgment of the symmetry axis), laser micro-etching coordinate marking of the non-appearance surface of the jade, preparation of the parent replica containing the waste embedding groove, and AR tracing based on ultraviolet fluorescence feature matching and digital twinning. The application restores the integrity of the parent body in the quality, space and visual dimensions through objective coordinate marking and waste positioning replica, and reflects the "same origin" cultural origin and root culture on the jade, and constitutes an unalterable property right certificate. Abstract drawing: Fig. 1.

Description

Technical Field

[0001] This invention belongs to the field of jade processing and digital traceability technology, and in particular relates to a method and system that integrates jade split processing, laser micro-engraving, 3D printed replicas and digital twin AR technology, to realize the physical restoration, digital traceability and solidification of the cultural value of jade "shared roots and origins". Background Technology

[0002] Jade carries profound ethical symbolism in Chinese culture. The *Book of Rites* records Confucius's discussion of the virtues of jade: "Its warmth and luster represent benevolence; its fineness and firmness represent wisdom; its integrity without sharpness represents righteousness." In the context of family inheritance, jade is further imbued with the metaphor of "shared roots and origins"—a complete piece of jade symbolizes the common origin of the family bloodline; distributing jade to family members is not only a material gift but also a spiritual contract of "connected branches and shared blood."

[0003] However, existing jade processing technology has long been constrained by the technological bias of "maximizing industrial efficiency." In traditional jade processing, technicians focus on "maximizing the yield," discarding scraps and wasted material as "waste." While this approach improves economic efficiency, it fundamentally severs the physical evidence of the "integrity of the parent material"—the jade pieces in the hands of family members lose their material connection to the parent material, and the "same origin" becomes an unverifiable verbal promise.

[0004] In terms of traceability technology, existing solutions mainly focus on anti-counterfeiting, such as RFID chip implantation, QR code laser engraving, and spectral feature databases. While these technologies can achieve "authenticity verification," they cannot answer core questions concerning "origin culture" and "root culture," such as "where in the mother body did this piece of jade originate?", "what is its spatial relationship with other jade pieces?", and "what is the complete form of the mother body?" In other words, existing technologies have ensured that "the jade is genuine," but have failed to determine "where the jade came from."

[0005] In recent years, technologies such as industrial CT scanning, 3D reconstruction, laser micro-engraving, and 3D printing have been independently applied in jewelry testing and cultural relic replication. However, the combined application of these technologies remains at the level of "improving processing precision" or "enhancing anti-counterfeiting capabilities," and no one has yet proposed a technical solution to "reintegrate cutting waste into the traceability system" to physically restore the integrity of the original object. This lack of technological motivation essentially ignores the "cultural ritualistic" value of jade, which is also the technological bias that this invention aims to overcome. Summary of the Invention

[0006] The purpose of this invention is to provide a method and system for processing and tracing jade in separate parts. By embedding cutting waste into 3D printed replicas according to the original spatial distribution, and combining it with laser micro-engraving coordinate marks and digital twin AR display, a paradigm shift from "maximizing industrial efficiency" to "restoring cultural experience" is achieved. This allows family members to perceive the integrity of the original at the visual, tactile, and digital interaction levels, truly embodying the "same root and origin" culture on the jade artifact, and forming an immutable certificate of ownership.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A method for processing and tracing jade in separate parts includes the following steps: S1: Perform industrial CT scanning on the jade matrix to obtain a three-dimensional model of its internal structure; S2: Perform a three-dimensional scan of the outer surface of the jade matrix to obtain the outer surface texture data, and register and fuse the outer surface texture data with the three-dimensional model of the internal structure to obtain a fused three-dimensional model; S3: Based on the fused 3D model, the density field gradient is extracted to determine the texture direction, a texture direction vector field is generated, and the cutting path is generated based on maximizing the absolute value of the cosine of the angle between the texture direction vectors of the jade pieces on both sides of the cutting surface. S4: Cut the jade mother body according to the cutting path to obtain several jade sub-items and cutting waste; S5: Establish a relative coordinate system with the uniquely identifiable reference feature point on the jade mother body as the origin. When the jade mother body has an axis of symmetry, introduce the endpoint of the secondary major axis or the direction of the centroid offset as an auxiliary determination to ensure the uniqueness of the coordinate system; calculate the centroid coordinates and attitude angle of each sub-jade artifact in the relative coordinate system. S6: Laser micro-engraving of the relative coordinates and attitude angles of each jade pie in the mother body on the non-exterior surface of each jade pie; the non-exterior surface is the surface of the jade pie that comes into contact with the human body when worn, or the hidden surface with the smallest curvature and the largest area in the shape-carved piece. S7: Based on the fused 3D model and the cutting path, prepare a parent replica containing all the jade artifact inlay slots and waste material inlay slots; for the waste material broken during the cutting process, use transparent epoxy resin to pre-form it in situ and then embed it into the waste material inlay slots of the replica according to its original spatial distribution in the parent body and fix it; place the jade artifact in the corresponding inlay slot so that the replica restores the integrity of the parent body; S8: Construct a digital twin platform to associate the coordinates, posture angles, and texture data of each jade artifact with the 3D model of the replica, and use AR to display the original position and texture continuity of each jade artifact in the parent body.

[0008] Further, in step S3, the generation of the segmentation path includes: reconstructing the three-dimensional density field of the fused three-dimensional model, calculating the density field gradient ∇ρ(x,y,z), and normalizing the gradient direction to the texture direction vector T(x,y,z); for candidate segmentation planes, calculating the cosine of the angle between their normal and the texture direction vector T(x,y,z); and using a genetic algorithm to solve for the optimal segmentation path with the optimization objective of "maximizing the sum of the absolute values ​​of the cosine of the angle between the texture direction vectors of the jade artifacts on both sides of the segmentation plane".

[0009] Further, in step S5, the reference feature point is at least one of the endpoint of the longest axis of the jade matrix, a natural surface feature protrusion, or an artificially marked point. The reference feature point is non-reproducible to ensure the reproducibility of the coordinate system. When the jade matrix is ​​a symmetrical body, the positive direction of the coordinate system is determined by combining the endpoint of the longest axis with the centroid offset direction, eliminating the ambiguity of a 180-degree flip. The centroid coordinates are a three-dimensional centroid based on CT voxel density weighting, and the CT voxel density value is obtained by subtracting density from CT grayscale value. The centroid calculation formula is obtained by converting the calibration curve: ρ̄=(Σρᵢ·rᵢ·Vᵢ) / (Σρᵢ·Vᵢ), where ρᵢ is the calibrated voxel density value, rᵢ is the voxel position vector, and Vᵢ is the voxel volume. The attitude angle is calculated based on the PCA method of the principal inertial axis, including centering the voxel coordinate matrix, calculating the covariance matrix, eigenvalue decomposition, taking the eigenvector corresponding to the largest eigenvalue as the principal inertial axis direction, and converting the principal inertial axis direction into ZYX Euler angles (α,β,γ).

[0010] Further, in step S6, the laser micro-engraving uses an ultraviolet femtosecond laser or nanosecond laser, with a groove depth of 10-20μm, a groove width of 50-100μm, and a wavelength of 355nm or 532nm. The marking is invisible to the naked eye after polishing and appears as blue-white fluorescent stripes under 365nm ultraviolet light irradiation. In step S8, the digital twin platform uses the Unity 3D engine to import the OBJ format 3D model. The AR display excites the fluorescent stripes with ultraviolet light, uses the SIFT algorithm to extract the feature points of the fluorescent stripes and matches them with the pre-stored feature points in the database. After successful matching, the coordinates and attitude angle data of the corresponding jade artifact are retrieved from the digital twin platform, and the parent 3D model and segmentation path are superimposed and rendered on the real-time camera image to realize the traceability mapping from the "physical jade artifact" to the "digital parent".

[0011] Further, in step S7, the cutting waste is virtually pre-divided according to the spatial coordinates of the fused 3D model before cutting. The pre-division divides the waste area into several sub-regions according to the cutting path, and each sub-region is assigned a unique spatial coordinate code. After cutting, the waste is collected independently according to the code. For the saw kerf loss and chipping debris generated by wire saw cutting, transparent epoxy resin is used to bond and pre-form it into a block shape corresponding to the virtual pre-division before embedding. The waste groove is distributed in the replica substrate according to the original space. After the cutting waste is placed into the groove, it is fixed by in-situ casting with transparent epoxy resin, and the surface is polished to the same gloss as the jade artifact display surface. The parent replica is prepared by 3D printing process. The printing material is a composite material of jade powder and photosensitive resin, in which the jade powder accounts for 60%-80% of the mass. The jade powder and the jade parent are the same material and origin. The surface texture of the replica is restored by UV inkjet printing or stereolithography to restore the outer surface texture data.

[0012] A jade processing and traceability system is an integrated hardware and software system, comprising: a CT scanning module, an outer surface scanning module, a registration and fusion module, a segmentation planning module, a coordinate identification module, a replica preparation module, and a digital twin platform. The segmentation planning module includes a density field reconstruction submodule, a gradient calculation submodule, a texture direction vector generation submodule, and a path optimization submodule based on a genetic algorithm. The coordinate identification module includes a reference feature point identification submodule, a density-weighted centroid calculation submodule, an attitude angle calculation submodule, and a laser micro-engraving control command generation submodule.

[0013] A jade artifact for tracing its origin is made from a single piece of jade. Its non-exterior surfaces are laser-engraved with its relative coordinates and posture angles within the original jade body. These non-exterior surfaces are the surfaces that come into contact with the wearer when the jade artifact is worn, or the hidden surfaces with the smallest curvature and largest area in any custom-carved piece. The engraved grooves are 10-20 μm deep, invisible to the naked eye after polishing, but identifiable under 365nm ultraviolet light. The jade artifact is used in conjunction with a 3D-printed replica of the original jade body. The replica includes cutting waste embedded in the original spatial distribution and the grooves of the jade artifact, to verify the authenticity of the coordinates and restore the integrity of the original jade body.

[0014] A replica of a jade artifact is prepared using 3D printing technology. The substrate is a composite material of jade powder and photosensitive resin, wherein the jade powder and the original jade artifact are of the same material and origin. The replica includes slots for inserting jade artifacts and slots for inserting waste material, which are arranged according to the original spatial distribution. Cutting waste material is embedded and fixed in the waste material slots according to the original spatial distribution. The slots for inserting jade artifacts are used to place corresponding jade artifacts, so that the replica restores the integrity of the jade artifact.

[0015] The beneficial effects of this invention include: (1) Overcoming the technical prejudice that “waste is useless”, cutting waste is redefined from “industrial loss” as “physical evidence of the integrity of the mother”. By embedding replicas according to the original spatial distribution, the physical restoration of the mother’s material form is realized, and “same root and same origin” is transformed from a cultural concept into a tangible and perceptible physical entity.

[0016] (2) By planning the texture continuity segmentation path based on the density field gradient, the texture direction of the jade pieces made of the same material is kept highly consistent, which ensures the visual homology between the jade pieces and enhances the verifiability of "coming from the same mother body".

[0017] (3) By using laser micro-engraving of relative coordinates and attitude angle markings, combined with ultraviolet fluorescence identifiable features and AR filtering algorithm, the precise correspondence between the position of the jade artifact and the mother body is realized. The traceability verification is fast and the recognition accuracy meets the needs of commercial traceability.

[0018] (4) By using a digital twin platform and AR display, physical replicas are superimposed with digital models, allowing family members to view the "original location of this jade in the mother stone" in real time on their mobile devices, realizing a dual traceability experience from "physical touch" to "digital interaction". Furthermore, in the scenario of consumers purchasing pebble jade, merchants can use the counter screen or mobile device to show customers the original location, cutting path and texture continuity of the pebble jade in the mother stone, so that customers can intuitively perceive the origin culture and root culture of "same root and same origin" before payment, enhancing the trust and cultural identity of the purchase decision.

[0019] (5) In the prior art, even if a 3D printed replica is embedded in the jade artifact, due to the waste material being discarded, the total mass of the replica deviates significantly from the original mother artifact, and there are visual "holes", making it impossible to verify the "same origin" through physical measurement. The present invention embeds the waste material according to the original spatial distribution, controlling the mass deviation within an acceptable range for engineering, so that the replica becomes verifiable physical evidence of the integrity of the mother artifact in three dimensions: mass, space, and visual appearance.

[0020] (6) Verification of objective technical indicators: The mass deviation between the replica (total mass of the jade artifact + mass of waste material + mass of the base material) and the original mother body is within the allowable range of precision measurement; After the jade artifact is placed in the groove of the replica, the spatial deviation between it and the original cutting position meets the requirements of precision assembly; The surface texture continuity score of the replica is based on the absolute value of the cosine of the angle between the texture direction vectors, and reaches a high level of consistency.

[0021] (7) Legal validity: The combination of the traceable jade artifact and its replica constitutes a complete certificate of ownership through the non-replicable natural reference feature points, laser micro-engraved coordinate marks, and waste materials embedded according to the original spatial distribution. In the division of family property, inheritance, or transactions of high-end jade artifacts, this combination provides an immutable chain of physical evidence and has clear legal evidentiary effect. Attached Figure Description

[0022] Figure 1 This is an overall flowchart of the jade processing and traceability method of the present invention; Figure 2 A schematic diagram of CT scan and 3D reconstruction of the jade matrix; Figure 3 This is a schematic diagram of the outer surface scanning and registration fusion. Figure 4 This is a schematic diagram of the texture direction vector field and segmentation path planning based on the density field gradient; Figure 5 A schematic diagram of establishing a relative coordinate system with the reference feature point as the origin (including auxiliary determination of the axis of symmetry); Figure 6 A schematic diagram of laser micro-engraving markings on a non-surface surface of a jade artifact. Figure 7 A schematic diagram of the structure of the replica (including the inlay groove for the jade artifact, the inlay groove for the waste material, and the embedded waste material). Figure 8 This is a schematic diagram of a digital twin platform and AR display interface (including consumer purchase scenarios). Figure 9 This is a diagram showing the cutting path and distribution of the jade pieces in the jade-sharing scheme for a family of three in Example 1; Figure 10 A schematic diagram showing the correspondence between waste pre-division and slotted space distribution; Figure 11 This is a schematic diagram of the CT grayscale value-density calibration curve; Figure 12 Flowchart for PCA principal inertia axis calculation and Euler angle conversion; Figure 13 This is a schematic diagram of in-situ bonding and preforming of crushed waste materials. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Example 1: Jade Dividing Plan for a Family of Three This embodiment uses a piece of Hetian jade pebble as an example to demonstrate the complete technical process of the present invention. The pebble measures approximately 180mm × 120mm × 80mm and weighs approximately 2.5kg. It is intended to be cut into three jade pieces (jade disc, jade pendant, and jade huang) to be given to a family of three.

[0025] S1: Industrial CT Scan. A microfocus industrial CT system (160kV X-ray source voltage, 5μm focal spot size, 2048×2048 detector resolution) was used to perform a 360° scan on the jade matrix to acquire projection data. A three-dimensional voxel model was reconstructed using the FDK reconstruction algorithm, with a voxel resolution of 45μm, resulting in the three-dimensional model of the internal structure, M_internal.

[0026] S2: External Surface Scanning and Registration Fusion. A blue light structured light 3D scanner (0.02mm accuracy) was used to acquire point cloud data of the parent model's surface. This data was then registered with M_internal using the ICP algorithm, and fused to obtain the fused 3D model M_fusion. The external surface texture was stored using UV mapping for subsequent surface texture restoration of the replica.

[0027] S3: Segmentation Path Planning. Based on M_fusion, a 3D density field is reconstructed, and the density field gradient ∇ρ(x,y,z) of each voxel is calculated. The gradient direction is normalized to the texture direction vector T(x,y,z). A set of candidate segmentation planes is defined, and for each candidate plane, the absolute value of the cosine of the angle between its normal and the texture direction vectors T on both sides is calculated. Using "maximizing the sum of the absolute values ​​of the cosines of the angles" as the objective function, a genetic algorithm is used to solve for the optimal segmentation path. After optimization, the mean absolute value of the cosine of the texture direction angles of the segmentation planes of the three jade artifacts all meet the texture continuity requirement. Experiments verify that, within a reasonable population size, number of iterations, and crossover mutation probability range, segmentation paths that meet the texture continuity requirement can be obtained within the set convergence threshold.

[0028] S4: Cutting. A diamond wire saw (0.35mm wire diameter) was used to cut along the optimized cutting path, resulting in three jade pieces and cutting waste (scraps, seam waste, total weight approximately 1.2kg).

[0029] S5: Coordinate System Establishment and Calculation. The longest axis endpoint of the parent jade piece (the natural skin color marker point) is used as the reference feature point. This marker point possesses an unreplicable natural skin color texture, ensuring the reproducibility of the coordinate system. A relative coordinate system is established. The density-weighted centroid coordinates of each jade artifact are calculated: First, the voxel gray values ​​are converted to density values ​​ρᵢ using the CT gray value-density calibration curve. Then, the centroid is calculated using the formula ρ̄=(Σρᵢ·rᵢ·Vᵢ) / (Σρᵢ·Vᵢ). The centroid coordinates and attitude angles of the jade bi, pendant, and huang are calculated and recorded separately. The attitude angle calculation uses the PCA method: centering the voxel coordinate matrix → calculating the 3×3 covariance matrix → eigenvalue decomposition → taking the eigenvector corresponding to the largest eigenvalue as the principal inertial axis direction → converting the principal inertial axis direction to ZYX Euler angles (α,β,γ).

[0030] S6: Laser micro-engraving. Using an ultraviolet nanosecond laser (wavelength 355nm, pulse width 10ns, repetition frequency 50kHz), relative coordinates and attitude angles are micro-engraved on the bottom of each jade piece (not the external surface, i.e., the surface in contact with the body when worn). The groove depth is 15μm, and the groove width is 80μm. After polishing with 2000-grit polishing, it is completely invisible to the naked eye. Under 365nm ultraviolet light, the markings appear as clear blue-white fluorescent stripes.

[0031] S7: Replica Preparation. Based on M_fusion and the segmentation path, a 3D model of the parent replica was designed. The replica was printed using SLA 3D printing, with the material being a composite material of Hetian jade powder (70% by mass, from the same source as the parent material) and photosensitive resin (30%). The replica includes: three jade artifact inlay slots (distributed according to the original space, with the slots and jade artifacts fitting together with a gap, tolerances within the allowable range of precision machining) and waste material inlay slots. Before cutting, the waste material was virtually pre-divided according to the spatial coordinates of M_fusion: the waste material area was divided into several sub-regions according to the segmentation path, and each sub-region was assigned a unique spatial coordinate code, which was collected independently after cutting according to the code. For the chipped debris generated during the cutting process, transparent epoxy resin was used to in-situ bond and pre-form it into a block shape corresponding to the virtual pre-division. The waste material from each region was placed into the corresponding waste material inlay slot, and in-situ cast and fixed with transparent epoxy resin (refractive index 1.52), with the surface polished to 8000 gloss. The three jade artifacts were placed into the corresponding inlay slots, and the replica restored the integrity of the parent material. Measurements show that the total mass of the replica (jade artifact + waste materials + base material) deviates from the mass of the original mother piece within an acceptable range for engineering purposes, significantly better than the traditional process of discarding waste materials.

[0032] S8: Digital Twin and AR Display. A digital twin platform was built using the Unity 3D engine, importing OBJ format 3D models from M_fusion, and associating the coordinates, pose angles, and texture data of each jade artifact. An AR application (supporting iOS / Android) was developed, using ultraviolet light to identify fluorescent stripes from laser micro-engraved markings. The SIFT algorithm was used to extract feature points of the fluorescent stripes and match them with pre-stored feature points in the database. Upon successful matching, the corresponding data was retrieved, and the parent 3D model, segmentation path, and original positions of the jade artifacts were overlaid and rendered on the real-time camera feed. During the AR display, image binarization and a 365nm wavelength filtering algorithm were applied to suppress ambient stray light and enhance the contrast of the fluorescent stripes. Test results showed that the average response time from "picking up the jade artifact" to "displaying the parent body's position" was short, and the recognition accuracy met the needs of commercial traceability.

[0033] Furthermore, in the consumer purchasing scenario, when a customer selects a jade disc at the counter, the salesperson can use the counter screen or the customer's mobile AR application to show the customer the location of the jade disc within its original mother stone—"The jade disc in your hand comes from the left side of the original mother stone, sharing the same origin as the jade pendant in the middle and the jade huang on the right." Customers can rotate the screen 360° to view the 3D model of the mother stone, the cutting path, and the continuity of the texture, intuitively perceiving the cultural origin of "shared roots," thus enhancing their trust and cultural identity in the purchase.

[0034] Example 2: Waste disposal control experiment To verify the objective technical effect of the present invention, three sets of control experiments were set up: Control group A (traditional process): No CT scan, no replicas, no coordinate markings, manual scribing + waterjet cutting, waste materials are discarded.

[0035] Control group B (no waste returned to its place): Using steps S1-S6 and S8 of the present invention, a replica is prepared but the waste is discarded. The replica is only embedded in the jade artifact, and there is no waste inlay groove.

[0036] Control group C (complete scheme of the present invention): all steps S1-S8 of the present invention are adopted. Waste materials are embedded into the replica according to the original spatial distribution. Crushed waste materials are embedded after being pre-formed by in-situ bonding.

[0037] Three sets of experiments were conducted using the same piece of Hetian jade (weighing approximately 2.5 kg). The results of the objective technical indicators are compared as follows: Control group A was unable to calculate mass conservation due to the disposal of waste materials, had no duplicates, could not be traced, and had no integrity of the parent material.

[0038] Although control group B achieved digital traceability, the lack of waste material placement resulted in visual "hollows" in the replicas, a significant deviation in total mass from the original, and an inability to fully recreate the material form of the original, breaking the chain of material evidence of "shared origin." The accuracy of placing the jade artifacts was limited by the lack of waste material inlays, and while the traceability identification accuracy was acceptable, the physical integrity was insufficient.

[0039] Control group C (the present invention) embeds the replica according to the original spatial distribution using waste materials. The total mass of the replica deviates from the original parent body within an acceptable engineering range, which is significantly better than control group B. The placement accuracy of the jade artifacts is high, meeting the requirements of precision assembly. The texture continuity score is based on CT planning, which is significantly better than control group A, which is based on experience cutting. The traceability verification response is fast, and the recognition accuracy meets commercial needs. The replica restores the integrity of the parent body in terms of quality, space, and visual dimensions, realizing a technological leap from "industrial jade separation" to "cultural restoration".

[0040] Example 3: Uniqueness Verification of Symmetrical Jade Coordinate System This embodiment verifies the effectiveness of the symmetry axis-assisted determination in step S5. A piece of Hetian jade mother body with an approximately ellipsoidal shape (weighing about 3.0 kg, with a major axis of 180 mm and a minor axis of 120 mm) is selected. The two ends of its longest axis have similar natural skin colors, which presents an ambiguity of 180-degree flip.

[0041] The present invention employs step S5: using the endpoint of the longest axis as a reference feature point, and simultaneously calculating the offset direction of the mother body's centroid (the centroid is biased towards the north endpoint of the long axis). When establishing the relative coordinate system, the positive direction of the Z-axis is determined by combining the endpoint of the longest axis with the offset direction of the centroid, eliminating ambiguity related to flipping. The mother body is divided into two jade artifacts, and their coordinates and attitude angles are calculated separately.

[0042] Verification method: Place the two jade pieces into the groove of the restored product according to the calculated coordinates and record the spatial deviation; then manually rotate the coordinate system by 180 degrees, recalculate, and return to the original position and record the deviation again.

[0043] The results show that using the auxiliary judgment method of this invention, the spatial deviation of the repositioning is minimal, meeting the requirements of precision assembly; while using the incorrect coordinate system after inversion, the spatial deviation of the repositioning is extremely large, making it impossible to place the jade piece into the inlay slot. This proves that the symmetry axis-assisted judgment can effectively eliminate coordinate system ambiguity and ensure coordinate uniqueness.

[0044] Example 4: A multi-generational jade-dividing scheme for a large family This embodiment demonstrates the application of the present invention in a complex family structure. A single piece of Hetian jade (approximately 15 kg in weight and 350 mm × 250 mm × 150 mm in size) needs to be distributed among 12 family members across three generations.

[0045] Using the method of this invention, CT scanning and texture continuity planning are first performed to divide the mother jade piece into 12 sub-jade artifacts (including jade plaques, jade beads, jade buckles, and other different shapes) and approximately 6.8 kg of cutting waste. A natural aquatic plant pattern feature point on the surface of the mother jade piece is used as the reference feature point. This feature point is a naturally formed, non-replicable texture intersection point, possessing unique identifiability. A relative coordinate system is established. After the coordinates and posture angles of each sub-jade artifact are marked with laser micro-engraving, each artifact is worn by a member of the family.

[0046] A replica of the original jade artifact was created, and all 12 inlay slots and scrap slots were arranged in the replica according to their original spatial distribution. The replica was placed in the family ancestral hall as a physical symbol of "shared roots and origins." When family members gather, they can place their respective jade artifacts in the replica and view "the original position of my jade artifact in the original" and "its adjacent relationship with the jade artifacts of my siblings" through AR display.

[0047] After testing, the 12 jade pieces were simultaneously placed in their original positions. The quality deviation between the replicas and the original pieces was within an acceptable engineering range. The spatial deviation of each jade piece in its original position met the requirements for precision assembly. The AR recognition accuracy met the needs of commercial traceability. Family members can experience the shared cultural roots through multiple dimensions, including tactile (touching the scrap grooves on the surface of the replicas), visual (viewing the complete replicas), and digital interaction (using AR to view positional relationships).

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0049]

statement

Claims

1. A method for processing and tracing jade in separate parts, characterized in that, Includes the following steps: S1: Perform industrial CT scanning on the jade matrix to obtain a three-dimensional model of its internal structure; S2: Perform a three-dimensional scan of the outer surface of the jade matrix to obtain the outer surface texture data, and register and fuse the outer surface texture data with the three-dimensional model of the internal structure to obtain a fused three-dimensional model; S3: Based on the fused 3D model, the density field gradient is extracted to determine the texture direction, a texture direction vector field is generated, and the cutting path is generated based on maximizing the absolute value of the cosine of the angle between the texture direction vectors of the jade pieces on both sides of the cutting surface. S4: Cut the jade mother body according to the cutting path to obtain several jade sub-items and cutting waste; S5: Establish a relative coordinate system with the uniquely identifiable reference feature point on the jade mother body as the origin. When the jade mother body has an axis of symmetry, introduce the endpoint of the secondary major axis or the direction of the centroid offset as an auxiliary determination to ensure the uniqueness of the coordinate system. Calculate the centroid coordinates and attitude angles of each jade artifact in the relative coordinate system; S6: Laser micro-engraving of the relative coordinates and attitude angles of each jade pie in the mother body on the non-exterior surface of each jade pie; the non-exterior surface is the surface of the jade pie that comes into contact with the human body when worn, or the hidden surface with the smallest curvature and the largest area in the shape-carved piece. S7: Based on the fused 3D model and the cutting path, prepare a parent replica containing all the jade artifact inlay slots and waste material inlay slots; for the waste material broken during the cutting process, use transparent epoxy resin to pre-form it in situ and then embed it into the waste material inlay slots of the replica according to its original spatial distribution in the parent body and fix it; place the jade artifact in the corresponding inlay slot so that the replica restores the integrity of the parent body; S8: Construct a digital twin platform to associate the coordinates, posture angles, and texture data of each jade artifact with the 3D model of the replica, and use AR to display the original position and texture continuity of each jade artifact in the parent body.

2. The method according to claim 1, characterized in that, In step S3, the generation of the segmentation path includes: reconstructing the three-dimensional density field of the fused three-dimensional model, calculating the density field gradient ∇ρ(x,y,z), and normalizing the gradient direction to the texture direction vector T(x,y,z); for candidate segmentation planes, calculating the cosine of the angle between their normal and the texture direction vector T(x,y,z); and using a genetic algorithm to solve for the optimal segmentation path with the optimization objective of "maximizing the sum of the absolute values ​​of the cosine of the angle between the texture direction vectors of the jade artifacts on both sides of the segmentation plane".

3. The method according to claim 1, characterized in that, In step S5, the reference feature point is at least one of the endpoint of the longest axis of the jade matrix, a natural surface feature protrusion, or an artificially marked point. The reference feature point is non-reproducible to ensure the reproducibility of the coordinate system. When the jade matrix is ​​symmetrical, the positive direction of the coordinate system is determined by combining the endpoint of the longest axis with the centroid offset direction, eliminating the ambiguity of a 180-degree flip. The centroid coordinates are a three-dimensional centroid based on CT voxel density weighting, and the CT voxel density value is calibrated using CT grayscale value-density calibration. The centroid calculation formula obtained from the curve transformation is ρ̄=(Σρᵢ·rᵢ·Vᵢ) / (Σρᵢ·Vᵢ), where ρᵢ is the calibrated voxel density value, rᵢ is the voxel position vector, and Vᵢ is the voxel volume. The attitude angle is calculated based on the PCA method of the principal inertial axis, including centering the voxel coordinate matrix, calculating the covariance matrix, eigenvalue decomposition, taking the eigenvector corresponding to the largest eigenvalue as the principal inertial axis direction, and converting the principal inertial axis direction into ZYX Euler angles (α,β,γ).

4. The method according to claim 1, characterized in that, In step S6, the laser micro-engraving uses an ultraviolet femtosecond laser or nanosecond laser, with a groove depth of 10-20 μm, a groove width of 50-100 μm, and a wavelength of 355 nm or 532 nm. The marking is invisible to the naked eye after polishing and appears as blue-white fluorescent stripes under 365 nm ultraviolet light. In step S8, the digital twin platform uses the Unity 3D engine to import an OBJ format 3D model. The AR display excites the fluorescent stripes with ultraviolet light, uses the SIFT algorithm to extract the feature points of the fluorescent stripes and matches them with pre-stored feature points in the database. After a successful match, the coordinates and attitude angle data of the corresponding jade artifact are retrieved from the digital twin platform, and the parent 3D model and segmentation path are superimposed and rendered on the real-time camera image to realize the traceability mapping from the "physical jade artifact" to the "digital parent".

5. The method according to claim 1 or 4, characterized in that, The AR display incorporates image binarization and a 365nm wavelength filtering algorithm to suppress ambient stray light and enhance the contrast of fluorescent stripes, ensuring that the accuracy of fluorescent stripe recognition meets commercial traceability requirements.

6. The method according to claim 1, characterized in that, In step S7, the cutting waste is virtually pre-divided according to the spatial coordinates of the fused 3D model before cutting. The pre-division divides the waste area into several sub-regions according to the cutting path, and each sub-region is assigned a unique spatial coordinate code. After cutting, the waste is collected independently according to the code. For the saw kerf loss and chipping debris generated by wire saw cutting, transparent epoxy resin is used to bond and pre-form it into a block shape corresponding to the virtual pre-division before embedding. The waste groove is distributed in the replica substrate according to the original space. After the cutting waste is placed into the groove, it is fixed by in-situ casting with transparent epoxy resin, and the surface is polished to the same gloss as the jade artifact display surface. The parent replica is prepared by 3D printing process. The printing material is a composite material of jade powder and photosensitive resin, in which the jade powder accounts for 60%-80% of the mass. The jade powder and the jade parent are the same material and origin. The surface texture of the replica is restored by UV inkjet printing or stereolithography to restore the outer surface texture data.

7. A jade processing and traceability system, characterized in that, For integrated hardware and software systems, including: The CT scanning module is used to perform industrial CT scans on the jade matrix and reconstruct a three-dimensional model of its internal structure. The outer surface scanning module is used to acquire the outer surface texture data of the jade matrix; The registration and fusion module is used to register and fuse the outer surface texture data with the internal structure 3D model to obtain a fused 3D model. The segmentation planning module is used to extract the density field gradient and generate the texture direction vector field based on the fused 3D model, and generate the segmentation path based on maximizing the absolute value of the cosine of the angle between the texture direction vectors. The coordinate identification module is used to establish a relative coordinate system with the uniquely identifiable reference feature point on the jade mother body as the origin, calculate the centroid coordinates and attitude angles of each sub-jade artifact, and generate laser micro-engraving control commands. The replica preparation module is used to prepare a parent replica containing the jade artifact inlay groove and the waste material inlay groove based on the fused three-dimensional model and the cutting path, and to embed and fix the cutting waste material according to the original spatial distribution; The digital twin platform is used to store the coordinates, pose angles, texture data and 3D models of each jade artifact in OBJ format, and supports AR display based on SIFT feature matching and 365nm wavelength filtering. The segmentation planning module includes a density field reconstruction submodule, a gradient calculation submodule, a texture direction vector generation submodule, and a path optimization submodule based on a genetic algorithm; the coordinate identification module includes a reference feature point identification submodule, a density-weighted centroid calculation submodule, an attitude angle calculation submodule, and a laser micro-carving control command generation submodule.

8. A jade artifact with traceable provenance, cut from a single piece of jade mother stone, characterized in that, The non-exterior surfaces of the jade artifact are laser-engraved with its relative coordinates and posture angles within the parent body. These non-exterior surfaces are the surfaces of the jade artifact that come into contact with the human body when worn, or the concealed surfaces with the smallest curvature and largest area in the irregularly shaped carvings. The engraved grooves are 10-20 μm deep, invisible to the naked eye after polishing, but identifiable under 365nm ultraviolet light. The jade artifact is used in conjunction with a 3D-printed replica of the parent body. The replica includes cutting waste embedded in the original spatial distribution and the grooves of the jade artifact, to verify the authenticity of the coordinates and restore the integrity of the parent body.

9. The jade artifact for provenance according to claim 8, characterized in that, The relative coordinates are based on a uniquely identifiable reference feature point on the jade matrix as the origin. When the matrix has an axis of symmetry, the positive direction of the coordinate system is determined by the endpoint of the longest axis combined with the centroid offset direction. The attitude angle is calculated based on the PCA method of the principal inertial axis or the direction angle based on the texture direction vector. When the jade artifact is placed back into the corresponding slot of the replica, the deviation between its spatial position and the original cutting position is within the allowable range of engineering.

10. A parent copy, characterized in that, The replica is manufactured using 3D printing technology. The substrate is a composite material of jade powder and photosensitive resin, and the jade powder is of the same material and origin as the original jade matrix. The replica includes slots for inserting sub-jade objects and slots for inserting waste material, which are arranged according to the original spatial distribution. Cutting waste material is embedded and fixed in the waste material slots according to the original spatial distribution. The slots for inserting sub-jade objects are used to place corresponding sub-jade objects, so that the replica restores the integrity of the original jade matrix.

Images