A three-dimensional modeling method for ship basic structure shape under incomplete information condition

Abstract

The application discloses a kind of non-perfect information condition under ship basic structure shape three-dimensional modeling method, including obtaining the three-dimensional modeling main scale basic data of ship platform;Establish the three-dimensional modeling coordinate system of ship basic structure shape, with ship overhead satellite remote sensing image as reference, construct initial main deck boundary line and superstructure contour model, with the deflection angle adjustment correction of initial model, with the deflection angle of correction as the shooting visual angle of satellite remote sensing image, restore to construct the two-dimensional normal overhead view of main deck boundary line and superstructure contour;Construct the control point coordinate of main deck boundary line, superstructure contour in the positive direction of Z axis, as the contour control point height above waterline, restore to construct the two-dimensional normal side view of ship basic structure shape;According to ship multi-view photograph, ship basic structure three-dimensional fitting is carried out, and ship platform basic structure three-dimensional shape modeling is completed.The application can realize the three-dimensional modeling of ship geometric shape under non-perfect information condition.

Description

Technical Field

[0001] This invention belongs to the field of research on target characteristic modeling and simulation of ship platforms, and specifically relates to a three-dimensional modeling method for the basic structural shape of ships under incomplete information conditions. Background Technology

[0002] Ship platforms are large offshore platforms with massive dimensions and complex superstructures. Regarding the electromagnetic scattering characteristics of ship platforms, the relevant structural elements mainly include the basic structure of the ship platform, consisting of the main hull and superstructure above the waterline, and the additional structures, consisting of masts and equipment components. The electromagnetic scattering characteristics of a ship reflect the interaction between incident electromagnetic waves and the surfaces of the basic and additional structures. Among these, the basic structure of the ship platform is the core element determining the electromagnetic scattering characteristics of the entire ship and the baseline for scattering intensity. The accuracy of its structural shape modeling directly affects the accuracy of the overall ship shape modeling. In the field of target characteristic modeling and simulation research of ship platforms, a high-confidence 3D model of the basic structural shape is required as the original input for effective electromagnetic scattering characteristic calculation and analysis.

[0003] The 3D modeling of the basic structural shape of ship platforms covers both cooperative and non-cooperative ship platforms. In the field of target characteristic modeling and simulation research of ship platforms, the calculation and analysis of the electromagnetic scattering characteristics of the basic structural shape of non-cooperative ship platforms can provide important references and insights for research such as cooperative target configuration design. Compared with the 3D modeling of the basic structural shape of cooperative ship platforms under complete information conditions, it is difficult to obtain high-confidence basic structural geometric shape information and orthogonal CAD drawings for the modeling of non-cooperative ship platforms. It mainly relies on the imitation of various publicly available photographs under the condition of two-dimensional projection contours. Due to the uncertainty of the shooting perspective in the photographs, it is impossible to achieve stable modes step by step under a unified coordinate reference condition, resulting in 3D modeling errors in the basic structural shape dimensions of non-cooperative ship platforms that are difficult to correct.

[0004] In the existing technology, there is no method for three-dimensional modeling of ship geometry under incomplete information conditions. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions. This method addresses the uncontrollable and undetectable biases in three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions and mitigates the risk of failure in the calculation and analysis of electromagnetic scattering characteristics.

[0006] The objective of this invention is achieved through the following technical solution: a method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions, comprising the following steps:

[0007] Step 1: Obtain the basic data of the main dimensions for the 3D modeling of the ship platform, including the overall length and total width;

[0008] Step 2: Layout planning modeling based on orthogonal view reconstruction;

[0009] Step 2.1: Establish a three-dimensional modeling coordinate system for the basic structural shape of the ship, where the X-axis is the length direction of the ship platform, the Y-axis is the width direction of the ship platform, and the Z-axis is the height direction of the ship platform;

[0010] Step 2.2: Using the overhead satellite remote sensing image of the ship as a reference, construct an initial model of the main deck edge line and the superstructure outline. Adjust and correct the deflection angle of the initial main deck edge line model. Use the corrected deflection angle as the shooting angle of the satellite remote sensing image to reconstruct a two-dimensional top-view of the main deck edge line and the superstructure outline.

[0011] Step 2.3: Construct the coordinates of the control points of the main deck edge line and the superstructure outline in the positive Z-axis direction, which will be used as the height of each control point above the waterline.

[0012] Step 2.4: Reconstruct the two-dimensional front and side views of the basic structural shape of the ship;

[0013] Step 3: Perform 3D fitting of the ship's basic structure based on multi-view photos of the ship, and complete the 3D shape model of the ship platform's basic structure.

[0014] Preferably, in step 1, the acquisition of the basic data of the master dimensions for the 3D modeling of the ship platform includes the following steps:

[0015] Step 1.1: Using the overall length and full width of the above-water hull as the basic conditions for the ship platform configuration, obtain multi-source data on the overall length and full width of the ship platform based on publicly available information channels;

[0016] Step 1.2: Select multiple samples of satellite remote sensing images from a top-down perspective, measure the total length and width of the ship platform using latitude and longitude coordinates, and compare and analyze the data with the corresponding data from multiple information sources to determine the main scale basic data used for 3D modeling.

[0017] Preferably, in step 1.2, the total length and full width data with the highest confidence are used as the main scale base data for 3D modeling.

[0018] Preferably, in step 2.2, the top-view satellite remote sensing image that is closest to the measured data of total length and full width and the basic data of the main scale is selected as a reference. An initial model of the main deck edge line and the superstructure outline is constructed in the XY coordinate plane. The initial main deck edge line model is deflected and corrected along the X-axis and Y-axis so that the corrected total length and full width in the XY coordinate plane are the same as the total length and full width data generated by the fusion of multi-source information. The deflection angle in this state is used as the shooting angle of the satellite remote sensing image to reconstruct the two-dimensional top-view of the main deck edge line and the outline of the superstructure.

[0019] Furthermore, in step 2.2, the initial main deck edge plane model is deflected by angle θ along the X-axis and Y-axis respectively according to the following formula. X and θ Y The adjustment and correction are based on the standard that the corrected full width and total length values ​​are the same as the total length and full width values ​​generated by multi-source information fusion, and θ is determined accordingly. X and θ Y ;

[0020] W′=W*cosθ X

[0021] L′=L*cosθ Y

[0022] Where L is the basic data of the overall length of the ship determined in step 1, W is the basic data of the overall width of the ship determined in step 1, L′ is the measured data of the overall length of the ship in the top-view satellite remote sensing image, and W′ is the measured data of the overall width of the ship in the top-view satellite remote sensing image; θ X θ is the initial deflection angle of the main deck edge planar model along the X-axis. Y The initial deflection angle of the main deck edge planar model along the Y-axis.

[0023] Preferably, in step 2.3, a photograph of the actual ship that is close to the frontal side view is selected, the plane where the waterline is located is defined on the XY coordinate plane, and the coordinates of the control points of the main deck edge line and the superstructure outline in the positive direction of the Z axis are initially constructed as the height above the waterline of each control point of the outline.

[0024] Furthermore, in step 2.3, the method for constructing the control point coordinates of the main deck edge line and the superstructure outline in the positive Z-axis direction includes the following steps:

[0025] Let the total length of the ship platform in the near-frontal side view of the actual ship be the high-confidence basic data L. Based on the comparison of the photo pixels, the X-axis coordinates of the two ends of the waterline and the Z-axis coordinates of each control point of the main deck edge line and the superstructure outline are initially generated, that is, the height above the waterline.

[0026] Preferably, in step 2.4, the method for reconstructing the two-dimensional front and side view of the basic structural shape of the ship includes the following steps: adjusting the deflection angle of the reconstructed main deck outline along the X-axis until it coincides with the main deck outline in the near-front and side view of the actual ship photograph; determining the deflection angle of the ship along the X-axis in the near-front and side view of the actual ship photograph; and using this as a reference to adjust the control point coordinates of the main deck edge line and the superstructure outline in the Z-coordinate direction to reconstruct the two-dimensional front and side view of the basic structural shape of the ship.

[0027] Furthermore, in step 2.4, the initial main deck outline model is adjusted by deflection angle along the X-axis according to the following formula:

[0028] W′=W*sinθ X

[0029] Where, φ X The angle of attitude deflection along the X-axis is the difference between the side view of the actual ship photograph and the front side view.

[0030] Preferably, step 3 further includes the following steps:

[0031] Step 3.1: Construct the initial three-dimensional shape model of each structural surface of the superstructure.

[0032] For the superstructure planar configuration, the relevant control points are drawn as straight lines. Based on the three-dimensional coordinates of the control points, the ship's three-dimensional lofting modeling method is used to construct the initial three-dimensional shape model of each structural surface of the superstructure.

[0033] Step 3.2: Construct the initial three-dimensional shape model of the main hull surface above the waterline.

[0034] Based on the two-dimensional top and side views generated in step 2, for the superstructure planar configuration, the control points at both ends are drawn as straight lines. Based on the three-dimensional coordinates of the control points, the ship's three-dimensional lofting modeling method is used to construct the initial three-dimensional shape model of each structural surface of the superstructure. For the curved surface configuration of the main hull above the waterline, the control points are classified according to the known main deck edge control points and the undetermined longitudinal section control points. The Y-axis coordinate of the waterline is assumed according to design experience, and the relevant control points are drawn as lines. Based on the three-dimensional coordinates of the control points, the ship's three-dimensional lofting modeling method is used to generate the initial three-dimensional shape model of the main hull surface above the waterline.

[0035] Step 3.3: Fitting and correcting the deviation of the undetermined control points in the initial 3D shape model

[0036] Select long-focal-length photographs of the actual ship from perspectives such as bow, stern, and oblique views. Using the consistency and matching between the 3D geometric model and the outline of the actual ship photograph as the standard, fit and correct the deviation of the undetermined control points in the 3D geometric model to complete the 3D shape model of the basic structure of the ship platform.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] This invention provides a 3D modeling method for the basic structural shape of ships under incomplete information conditions, applicable to research related to the calculation, analysis, and evaluation of electromagnetic scattering characteristics of non-cooperative ship platforms. This invention addresses the uncontrollable and unrecognizable biases inherent in 3D modeling of the basic structural shape of ships under incomplete information conditions, mitigating the risk of failure in electromagnetic scattering characteristic calculation and analysis. It requires referencing ship platform configuration design elements to accurately obtain the overall length and full width data of the non-cooperative ship platform, providing fundamental constraints for the 3D modeling of the basic structural shape; accurately establishing the superstructure layout plan of the non-cooperative ship platform to provide a scheme reconstruction for the 3D modeling of the basic structural shape; and accurately fitting the main hull curved surface structure shape of the non-cooperative ship platform to provide shape matching for the 3D modeling of complex curvature configurations of the main hull.

[0039] This invention fully utilizes publicly available information and multi-view photographs to achieve step-by-step approximation 3D modeling of the ship's basic structural dimensions, regional planning, and structural shape under incomplete information conditions. This promotes the transformation of 3D modeling of non-cooperative ship platforms from "passive simulation" to "active design." The 3D modeling method for the basic ship structure provided by this invention is not only applicable to the main hull and superstructure above the waterline, but can also be extended to the 3D modeling and verification of the shape of ship platform attachments such as masts and equipment components, as well as other non-cooperative platforms. Attached Figure Description

[0040] Figure 1 This is a flowchart of a three-dimensional modeling method for the basic structural shape of a ship under incomplete information conditions, as described in this invention.

[0041] Figure 2 This is a schematic diagram illustrating the measurement of the total length and full width of satellite remote sensing images from a top-down perspective in an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the process for generating high-confidence total length and full width data in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram illustrating the three-dimensional coordinate definition of the geometric shape of the ship platform in an embodiment of the present invention;

[0044] Figure 5 This is a two-dimensional top view of the basic structural outline of the ship platform constructed in this embodiment of the invention;

[0045] Figure 6 This is a two-dimensional front and side view of the basic structural outline of the ship platform constructed in this embodiment of the invention;

[0046] Figure 7This is a schematic diagram illustrating the construction of the initial three-dimensional model of the basic structural surface based on control point lofting in an embodiment of the present invention;

[0047] Figure 8 This is a three-dimensional shape model of the basic ship structure after fitting and correction in an embodiment of the present invention. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] like Figure 1 As shown, the technical solution of the present invention provides a method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions, including the following steps:

[0050] Step 1: Generate master-scale basic data through multi-source information fusion, and obtain the master-scale basic data for the three-dimensional modeling of the ship platform, including the overall length and full width.

[0051] Step 1.1: Using the overall length and beam of the above-water hull as the basic conditions for the ship platform configuration, multi-source data on the overall length and beam of the ship platform are obtained based on publicly available information channels, including the internet, journals, forums, and simulation software databases. In this embodiment, based on publicly available information from user manuals, official websites, simulation software, authoritative databases, and other multi-source information channels, the basic structural length and beam data of the ship platform are obtained and arranged in descending order, denoted as L1, L2…L… n W1, W2...W n .

[0052] Step 1.2: As Figure 2 As shown, multiple samples of satellite remote sensing images from a top-down perspective were selected, and the total length and width of the ship platform were measured using latitude and longitude coordinates, denoted as L1, L2…L… m W1, W2...W m And take the maximum value of the total length and full width data from all samples, and denote them as L′ respectively. MAX and W′ MAX The data was compared and analyzed with corresponding data from multiple information sources. The total length and full width data with the highest confidence were used as the primary scale base data for 3D modeling. Specific comparison rules are as follows: Figure 3 As shown, the total length and full width data of the ship platform obtained from multiple information sources in step 1.1 are selected, arranged in ascending order, and compared one by one with the L′ determined in step 1.2. MAX and W′MAX Compare and select those that meet L i ≥L′ MAX and W i ≥W′ MAX The total length and full width data of the judgment conditions are averaged separately for the selected total length and full width data, and used as the high-confidence principal scale base data for 3D modeling, denoted as L and W.

[0053] Step 2: Layout planning modeling based on orthogonal view reconstruction;

[0054] Step 2.1: As Figure 4 As shown, a three-dimensional modeling coordinate system for the basic structural shape of the ship is established, where the X-axis is the length direction of the ship platform, the Y-axis is the width direction of the ship platform, the Z-axis is the height direction of the ship platform, and the center of the total length is the origin of the coordinate system.

[0055] Step 2.2: Using the top-view satellite remote sensing image that approximates the main-scale basic data with the measured total length and full width data as a reference, construct the initial main deck edge line and superstructure outline model on the XY coordinate plane (horizontal plane). The measured total length and full width data are denoted as L′ and W′, respectively. In Step 2.2, the initial main deck edge line plane model is deflected by an angle θ along the X-axis and Y-axis respectively according to the following formula. X and θ Y The adjustment and correction are based on the standard that the corrected full width and total length values ​​are the same as the total length and full width values ​​generated by multi-source information fusion, and θ is determined accordingly. X and θ Y ;

[0056] W′=W*cosθ X

[0057] L′=L*cosθ Y

[0058] Where L is the basic data of the overall length of the ship determined in step 1, W is the basic data of the overall width of the ship determined in step 1, L′ is the measured data of the overall length of the ship in the top-view satellite remote sensing image, and W′ is the measured data of the overall width of the ship in the top-view satellite remote sensing image; θ X θ is the initial deflection angle of the main deck edge planar model along the X-axis. Y The initial deflection angle of the main deck edge planar model along the Y-axis is used as the shooting angle of the satellite remote sensing image. This angle is then used to reconstruct the X-axis and Y-axis coordinates of each control point for the main deck edge and superstructure outline, thus constructing a two-dimensional front and top view of the ship's basic structural shape. Figure 5 As shown.

[0059] Step 2.3: Select a photograph of the actual ship that closely approximates the frontal side view. Define the plane containing the waterline on the XY coordinate plane. Let the total length of the ship platform in the photograph closely approximates the frontal side view be the high-confidence basic data L. Based on the comparison of photograph pixels, initially generate the X-axis coordinates of both ends of the waterline and the Z-axis coordinates of each control point of the main deck edge and the superstructure outline, as the height H above the waterline. i (i = 1, 2, ..., n).

[0060] Step 2.4: Adjust the deflection angle of the initial main deck outline model along the X-axis according to the following formula:

[0061]

[0062] in, To determine the attitude deflection angle of the ship's side-view photograph relative to the frontal side view along the X-axis, until it coincides with the main deck outline in the near-frontal side view photograph, the standard is that the corrected full width value is the same as the full width value generated by multi-source information fusion. Using this deflection angle, the Z-axis coordinates of each control point on the main deck edge and the superstructure outline are reconstructed:

[0063]

[0064] Based on the X-axis and Z-axis coordinates of each control point on the main deck and superstructure outline, a two-dimensional front and side view of the ship's basic structural shape is reconstructed, such as... Figure 6 As shown.

[0065] Step 3: Perform 3D fitting of the ship's basic structure based on multi-view photos of the ship, and complete the 3D shape model of the ship platform's basic structure.

[0066] Step 3.1: Construct the initial three-dimensional shape model of each structural surface of the superstructure.

[0067] For the superstructure planar configuration, the relevant control points are drawn as straight lines. Based on the three-dimensional coordinates of the control points, the ship's three-dimensional lofting modeling method is used to construct the initial three-dimensional shape model of each structural surface of the superstructure.

[0068] Step 3.2: Construct the initial three-dimensional shape model of the main hull surface above the waterline.

[0069] Based on the two-dimensional top and side views generated in step 2, for the superstructure planar configuration, the control points at both ends are drawn as straight lines. Using a ship 3D lofting modeling method based on the three-dimensional coordinates of the control points, the initial three-dimensional shape model of each structural surface of the superstructure is constructed. For the curved surface configuration of the main hull above the waterline, it is classified according to the known main deck edge control points and the undetermined longitudinal section control points. The Y-axis coordinate of the waterline is assumed based on design experience, and the relevant control points are drawn as lines. Using a ship 3D lofting modeling method based on the three-dimensional coordinates of the control points, the initial three-dimensional shape model of the main hull surface above the waterline is generated. Figure 7 As shown.

[0070] Step 3.3: Fitting and correcting the deviation of the undetermined control points in the initial 3D shape model

[0071] Long-focal-length photographs of the actual ship are selected from near-bow, stern, and oblique view perspectives. Using the consistency between the 3D geometric model and the outline of the actual ship photograph as the standard, the deviation of undetermined control points in the 3D geometric model is fitted and corrected to complete the 3D shape model of the basic structure of the ship platform. In this embodiment, the fitted and corrected 3D shape model of the basic ship structure is as follows: Figure 8 As shown.

[0072] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions, characterized in that: The method includes the following steps: Step 1: Obtain the basic data of the main dimensions for the 3D modeling of the ship platform, including the overall length and total width; Step 2: Layout planning modeling based on orthogonal view reconstruction; Step 2.1: Establish a three-dimensional modeling coordinate system for the basic structural shape of the ship, where the X-axis is the length direction of the ship platform, the Y-axis is the width direction of the ship platform, and the Z-axis is the height direction of the ship platform; Step 2.2: Using the overhead satellite remote sensing image of the ship as a reference, construct an initial model of the main deck edge line and the superstructure outline. Adjust and correct the deflection angle of the initial main deck edge line model. Use the corrected deflection angle as the shooting angle of the satellite remote sensing image to reconstruct a two-dimensional top-view of the main deck edge line and the superstructure outline. Step 2.3: Construct the coordinates of the control points of the main deck edge line and the superstructure outline in the positive Z-axis direction, which will be used as the height of each control point above the waterline. Step 2.4: Reconstruct the two-dimensional front and side views of the basic structural shape of the ship; Step 3: Perform 3D fitting of the ship's basic structure based on multi-view photos of the ship, and complete the 3D shape model of the ship platform's basic structure; Step 3 further includes the following steps: Step 3.1: Construct the initial three-dimensional shape model of each structural surface of the superstructure. For the superstructure planar configuration, the relevant control points are drawn as straight lines. Based on the three-dimensional coordinates of the control points, the ship's three-dimensional lofting modeling method is used to construct the initial three-dimensional shape model of each structural surface of the superstructure. Step 3.2: Construct the initial three-dimensional shape model of the main hull surface above the waterline. Based on the two-dimensional top and side views generated in step 2, for the superstructure planar configuration, the control points at both ends are drawn as straight lines. Based on the three-dimensional coordinates of the control points, the ship's three-dimensional lofting modeling method is used to construct the initial three-dimensional shape model of each structural surface of the superstructure. For the curved surface configuration of the main hull above the waterline, the control points are classified according to the known main deck edge control points and the undetermined longitudinal section control points. The Y-axis coordinate of the waterline is assumed according to design experience, and the relevant control points are drawn as lines. Based on the three-dimensional coordinates of the control points, the ship's three-dimensional lofting modeling method is used to generate the initial three-dimensional shape model of the main hull surface above the waterline. Step 3.3: Fitting and correcting the deviation of the undetermined control points in the initial 3D shape model Select long-focal-length photographs of the actual ship from perspectives such as bow, stern, and oblique views. Using the consistency and matching between the 3D geometric model and the outline of the actual ship photograph as the standard, fit and correct the deviation of the undetermined control points in the 3D geometric model to complete the 3D shape model of the basic structure of the ship platform.

2. The method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions as described in claim 1, characterized in that: In step 1, the basic data of the master dimensions for the 3D modeling of the ship platform are obtained, including the following steps: Step 1.1: Using the overall length and full width of the above-water hull as the basic conditions for the ship platform configuration, obtain multi-source data on the overall length and full width of the ship platform based on publicly available information channels; Step 1.2: Select multiple samples of satellite remote sensing images from a top-down perspective, measure the total length and width of the ship platform using latitude and longitude coordinates, and compare and analyze the data with the corresponding data from multiple information sources to determine the main scale basic data used for 3D modeling.

3. The method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions as described in claim 2, characterized in that: In step 1.2, the total length and full width data with the highest confidence level are used as the main scale base data for 3D modeling.

4. The method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions as described in claim 1, characterized in that: In step 2.2, the top-view satellite remote sensing image that is closest to the measured data of total length and full width and the basic data of the main scale is selected as a reference. An initial model of the main deck edge line and the outline of the superstructure is constructed in the XY coordinate plane. The initial model of the main deck edge line is deflected and corrected along the X and Y axes so that the corrected total length and full width in the XY coordinate plane are the same as the total length and full width data generated by the fusion of multi-source information. The deflection angle in this state is used as the shooting angle of the satellite remote sensing image to reconstruct the two-dimensional top-view of the main deck edge line and the outline of the superstructure.

5. The method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions as described in claim 4, characterized in that: In step 2.2, the initial main deck edge plane model is deflected along the X-axis and Y-axis respectively according to the following formula. and The adjustment and correction are based on the standard that the corrected full width and total length values ​​are the same as the total length and full width values ​​generated by multi-source information fusion. and ; in, L The basic data for the overall length of the ship determined in step 1, W The basic data for the main dimensions of the entire ship's width determined in step 1. This is the measured data of the total length of the ship in the overhead satellite remote sensing image. This refers to the measured data of the ship's full width in a top-down satellite remote sensing image; The initial main deck edge planar model is deflected along the X-axis by the following angle. The initial deflection angle of the main deck edge planar model along the Y-axis.

6. The method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions as described in claim 4, characterized in that: In step 2.3, a photograph of the actual ship that closely resembles the frontal side view is selected, and the plane containing the waterline is defined on the XY coordinate plane. The coordinates of the control points of the main deck edge line and the superstructure outline in the positive Z-axis direction are initially constructed as the height above the waterline of each control point of the outline.

7. The method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions as described in claim 6, characterized in that: In step 2.3, the method for constructing the control point coordinates of the main deck edge line and the superstructure outline in the positive Z-axis direction includes the following steps: Let the total length of the ship platform, as shown in the near-side view photograph of the actual ship, be the high-confidence baseline data. L Based on the comparison of photo pixels, the X-axis coordinates of both ends of the waterline and the Z-axis coordinates of each control point of the main deck edge line and the superstructure outline are initially generated, which is the height above the waterline.

8. The method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions as described in claim 4, characterized in that: In step 2.4, the method for reconstructing a two-dimensional front and side view of the basic structural shape of the ship includes the following steps: adjusting the deflection angle of the reconstructed main deck outline along the X-axis until it coincides with the main deck outline in the near-front and side view of the actual ship photograph; determining the deflection angle of the ship along the X-axis in the near-front and side view of the actual ship photograph; and using this as a reference to adjust the control point coordinates of the main deck edge line and the superstructure outline in the Z-coordinate direction to reconstruct a two-dimensional front and side view of the basic structural shape of the ship.

9. A method for three-dimensional modeling of the basic structural shape of a ship under incomplete information conditions as described in claim 8, characterized in that: In step 2.4, the initial main deck outline model is deflected along the X-axis according to the following formula: in, The angle of attitude deflection along the X-axis is the difference between the side view of the actual ship photograph and the front side view.

Images