Art expression method based on dynamic light and shadow

Abstract

The invention relates to the technical field of dynamic light and shadow art expression, in particular to an art expression method based on dynamic light and shadow, which comprises the following steps: setting an adjustable light source system, a projection surface and a dynamic adjusting mechanism, and establishing a basic light and shadow mapping reference link through a joint calibration light source module; dynamically adjusting the angle and distance between the light source and the projection surface to excite a multi-dimensional light and shadow mode; a shielding object is arranged between a light source and a projection surface, a light and shadow effect model containing distance and angle variables of the shielding object is constructed through stepping measurement, and finally a correction model is obtained through fitting by using a nonlinear least square method. The method can quantify the influence of light and shadow changes on visual perception, solves the problem of insufficient flexibility in the prior art, and provides theoretical and technical support for dynamic light and shadow artistic presentation in the fields of buildings, stages, movies and televisions and the like.

Description

Technical Field

[0001] This invention belongs to the interdisciplinary field of art and technology, specifically a method of artistic expression based on dynamic light and shadow. Background Technology

[0002] Dynamic light and shadow art is an innovative form that conveys emotions, creates atmosphere, and enhances artistic expression through changes in light and shadow. It is widely used in architecture, stage performance, film, and other fields. With the rapid development of lighting technology, the potential of dynamic light and shadow in artistic expression has gradually attracted attention. However, existing technologies still have certain limitations in achieving artistic expression, especially in terms of the flexibility of dynamic changes in light and shadow, interactivity with the environment, and depth of artistic expression.

[0003] A search revealed that patent document CN119357499B discloses a method, apparatus, storage medium, and electronic device for dynamic lighting and shadow rendering of a website, published on April 8, 2025. This technology achieves dynamic adaptive subdivision rendering of webpage lighting and shadow by acquiring the current webpage layout parameters of the target website and optimizing the lighting and shadow effects using a multi-objective function. However, this solution is primarily designed for webpage scenarios, and its lighting and shadow changes are limited to visual optimization in a two-dimensional plane, lacking support for artistic expression of lighting and shadow in three-dimensional space. Furthermore, the dynamic adjustment of lighting and shadow in this solution relies on a preset optimization model, and its ability to generate lighting and shadow effects with a deep artistic feel under real-time environmental changes is relatively limited, which to some extent affects its widespread application in the art field.

[0004] Another patent document, CN110986682B, discloses a control system for a dynamic light and shadow target, published on June 3, 2022. This technology achieves rapid switching between visible and hidden targets during shooting training by controlling the linkage between a conductive film target plate and a spotlight, providing dynamic light and shadow effects. However, the main application scenario of this solution is concentrated in shooting training, the light and shadow change mode is relatively simple, and it is primarily functional, lacking design considerations for artistic expression. Furthermore, the light and shadow control method of this solution relies on a fixed hardware structure, which imposes certain constraints on achieving the artistic and dynamic presentation of complex light and shadow effects, making it difficult to meet the needs of diverse artistic expression.

[0005] The aforementioned problems indicate that existing dynamic lighting and shadow technologies still have room for improvement in terms of flexibility, artistic expression, and deep integration with the environment. Therefore, this invention proposes an artistic expression method based on dynamic lighting and shadow, aiming to enhance the expressiveness and application value of lighting and shadow technology in the art field through flexible dynamic changes in light and shadow and interaction with the environment, combined with artistic lighting and shadow design, thereby better meeting the needs of modern art creation for dynamic lighting and shadow technology. Summary of the Invention

[0006] To address the aforementioned issues, this invention aims to propose an artistic expression method based on dynamic light and shadow. By introducing a multi-dimensional light and shadow control mechanism and a dynamic adaptation strategy involving environmental interaction, a mapping model between light and shadow changes and spatial artistic expression is established. By quantifying the impact of dynamic light and shadow changes on visual perception and combining high-precision experimental data, a model of the light and shadow effect is constructed, thereby overcoming the shortcomings of existing technologies in terms of flexibility, artistic expressiveness, and deep integration with the environment. This invention provides theoretical and technical support for the artistic presentation of dynamic light and shadow in architecture, stage performance, film, and other fields.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0008] An artistic expression method based on dynamic light and shadow includes the following steps:

[0009] An adjustable light source system and projection surface are set up, and a set of dynamic adjustment mechanisms are installed in front of the light source system;

[0010] The multiple light source modules of the light source system are jointly calibrated to establish a basic light and shadow mapping reference link;

[0011] The angle and distance between the light source module and the projection surface are dynamically adjusted to fully stimulate multi-dimensional light and shadow projection modes;

[0012] A movable obstruction is set between the light source and the projection surface. The vertical distance dop between the obstruction and the projection surface is adjusted by setting the range. Multiple sets of light and shadow effect samples are obtained by step measurement.

[0013] By repeatedly measuring under multi-angle θsrc conditions, a light and shadow effect relationship matrix containing the bivariate dop / θsrc was constructed;

[0014] A nonlinear least squares method was used to perform bivariate joint fitting on the measurement data to establish a light and shadow effect model with occlusion compensation.

[0015] Furthermore, a light source system LS, a projection surface PM, and a set of dynamic adjustment mechanisms are provided, wherein the angle θsrc between the light source system and the projection surface is adjustable, and the dynamic adjustment mechanisms are located between the light source system LS and the projection surface PM.

[0016] Furthermore, the light source system and projection surface are connected to the OSA spectral analyzer via optical fiber, and the light source system is equipped with multiple light source modules for experiments, thereby establishing a basic light and shadow mapping reference link.

[0017] Furthermore, the relative position and angle between the light source module and the projection surface are adjusted to fully stimulate the multi-dimensional light and shadow projection mode.

[0018] Furthermore, the horizontal distance between the light source system LS and the projection surface PM is fixed, and the vertical distance dop between the obstruction and the projection surface is adjusted. The light and shadow distribution data of the obstruction at its vertical distance from the projection surface is collected using the light and shadow measurement instrument. The average value of the light and shadow intensity is calculated from this measurement data as the final light and shadow effect value corresponding to each measurement.

[0019] Furthermore, the angle θsrc between the light source system and the projection surface is changed and the value of dop is adjusted. The above steps are repeated, and the boundary value of dop is obtained in the range of 0.1-1.5m. Based on the above steps, multiple light and shadow effect values ​​are obtained, and a light and shadow effect model with the influence of the distance of the occluder from the projection surface in the vertical direction is constructed.

[0020] Furthermore, the constructed lighting effect model is fitted with parameters using the least squares method to obtain the correction values ​​of each parameter of the lighting effect model. The final lighting effect model is then obtained using the correction values ​​of each parameter.

[0021] Furthermore, in the above step, the obtained light and shadow effect values ​​are subjected to parameter fitting, and the light and shadow intensity index can be expressed as:

[0022] Where represents the distance of the obstruction from the projection plane in the vertical direction, and , , represent the coefficients of the above expressions respectively;

[0023] The final expression for the constructed light and shadow effect model, which is influenced by the distance of the occluding object from the projection plane in the vertical direction, is:

[0024] Where is the distance between the obstructing object and the projection surface in the vertical direction; and are the coefficients of each term in the above expression.

[0025] Furthermore, the expression for the final lighting effect model is as follows:

[0026] Where is the selected reference distance, represents the light and shadow intensity value at the reference distance, represents the angle between the light source system and the projection surface, represents the distance of the obstruction from the projection surface in the vertical direction, represents the light and shadow intensity index, and represents a random fluctuation that follows a normal distribution with a mean of 0 and a standard deviation of .

[0027] To achieve the above objectives, the present invention also provides an application of an artistic expression method based on dynamic light and shadow, which can be used in architectural light and shadow design scenarios, or as a complex light and shadow presentation with multiple light sources working together, or as a dynamic light and shadow artistic expression under real-time environmental changes.

[0028] Beneficial Effects: This invention establishes a light and shadow effect model based on the distance between the occluder and the projection surface in the vertical direction by introducing a multi-dimensional light and shadow control mechanism and a dynamic adaptation strategy for environmental interaction. By quantifying the multi-dimensional light and shadow changes caused by the displacement of the occluder and combining this with high-precision experimental data, the light and shadow effect model is constructed. This solves the problems of flexibility, artistic expression, and deep integration with the environment in existing technologies, providing theoretical support for the dynamic light and shadow art presentation in architecture, stage, film, and other fields. Furthermore, this invention can be used for complex light and shadow presentation with multi-source collaboration (e.g., a hybrid light source mode combining point and surface light sources), and also for dynamic light and shadow art expression under real-time environmental changes. (See attached figures.)

[0029] Figure 1 This is a schematic diagram of the system structure of the dynamic light and shadow art expression method in an embodiment of the present invention, showing the arrangement of the light source system, projection surface and dynamic adjustment mechanism.

[0030] Figure 2 This is a schematic diagram of a measurement scenario for adjusting the vertical distance between the occluder and the projection surface in an embodiment of the present invention, showing the effect of the occluder on the light and shadow effect at different distances.

[0031] Figure 3 This is a flowchart illustrating the process of constructing a light and shadow effect model based on bivariate fitting in an embodiment of the present invention, describing the main steps from data acquisition to model establishment.

[0032] The attached figures are labeled as follows: 1. Light source system; 2. Projection surface; 3. Dynamic adjustment mechanism; 4. Obstruction; 5. Spectrometer. Detailed implementation method.

[0033] This invention provides an artistic expression method based on dynamic light and shadow. Its core lies in establishing a model of the influence of the distance between the occluding object and the projection surface in the vertical direction on the light and shadow effect through a multi-dimensional light and shadow control mechanism and a dynamic adaptation strategy based on environmental interaction. This model is then constructed using high-precision experimental data. The following is in conjunction with the appendix... Figure 1 To be continued Figure 3 The specific component numbers marked in the accompanying drawings are used to describe the specific embodiments of the present invention in detail.

[0034] like Figure 1As shown, the system structure involved in this embodiment includes a light source system 1, a projection surface 2, a dynamic adjustment mechanism 3, an obstruction 4, and a spectrometer 5. The light source system 1 is positioned on one side of the projection surface 2, forming a certain angle θsrc between them. This angle can be adjusted by the dynamic adjustment mechanism 3. The dynamic adjustment mechanism 3 is located between the light source system 1 and the projection surface 2, and is used to change the angle and position of the light source system 1. The obstruction 4 is also positioned between the light source system 1 and the projection surface 2, and its vertical distance dop between it and the projection surface 2 is adjustable. The spectrometer 5 is connected to the light source system 1 and the projection surface 2 via optical fibers, and is used to collect the light and shadow distribution data of the light emitted by the light source system 1 after passing through the obstruction 4 and projected onto the projection surface 2.

[0035] In the specific implementation process, the first step is to jointly calibrate multiple light source modules in light source system 1. Light source system 1 consists of several independent light source modules, which are connected to the spectrum analyzer 5 via optical fiber. The calibration process involves uniformly adjusting parameters such as the luminous intensity, wavelength range, and beam divergence angle of each light source module to reference values, thereby establishing a basic light and shadow mapping reference link. This process ensures that the optical signals output by light source system 1 have a high degree of consistency, providing a reliable experimental basis for subsequent light and shadow effect modeling.

[0036] After calibrating the light source system, the relative position and angle θsrc between the light source system 1 and the projection surface 2 need to be adjusted. Specifically, the horizontal distance Lsp between the light source system 1 and the projection surface 2, as well as the tilt angle θsrc of the light source system 1 relative to the projection surface 2, are changed through the dynamic adjustment mechanism 3. During the adjustment process, it should be ensured that the central axis of the light source system 1 always points to the center area of ​​the projection surface 2 to avoid uneven light and shadow distribution caused by light source offset. At the same time, the dynamic adjustment mechanism 3 also allows the light source system 1 to move up and down in the vertical direction, thereby further enriching the light and shadow projection patterns.

[0037] Next, an obstruction 4 is introduced between the light source system 1 and the projection surface 2. The obstruction 4 is positioned in the middle section between the light source system 1 and the projection surface 2, and its vertical distance dop between it and the projection surface 2 can be continuously adjusted within the range of 0.1m to 1.5m. To obtain multiple sets of light and shadow effect samples, this embodiment adopts a step-by-step measurement method, that is, the obstruction 4 is moved vertically by a fixed step size Δdop (e.g., 0.05m) each time, and the corresponding light and shadow distribution data is recorded. During this process, the spectral analyzer 5 collects the light and shadow intensity distribution information on the projection surface 2 in real time and calculates the average light and shadow intensity under each set of measurement conditions as the final light and shadow effect value.

[0038] Furthermore, to comprehensively examine the impact of changes in the position of the obstruction 4 on the lighting effects, the above measurement steps need to be repeated under different light source angles θsrc. For example... Figure 2 As shown, when the angle θsrc between the light source system 1 and the projection surface 2 changes, the vertical distance dop between the occluder 4 and the projection surface 2 also adjusts accordingly. By changing the value of θsrc and simultaneously adjusting the range of dop values, a series of light and shadow effect sample data containing the two variables dop and θsrc can be obtained. These data form the basis for constructing the light and shadow effect relationship matrix.

[0039] Based on the above measurement results, this embodiment employs nonlinear least squares method to jointly fit the bivariate dop and θsrc to establish a lighting effect model with occlusion compensation. Specifically, all measurement data are first categorized according to the combination of dop and θsrc, and then the nonlinear least squares method is used to fit each type of data to extract the corresponding model parameters. During the fitting process, special attention should be paid to the occlusion effect of the presence of occluder 4 on the light and shadow distribution, and this effect is quantified as a correction coefficient and added to the model. Finally, the constructed lighting effect model can be expressed as a function expression of dop and θsrc, containing polynomial and exponential terms to describe the trend of light and shadow intensity changing with the position of the occluder and the angle of the light source.

[0040] In practical applications, the dynamic light and shadow art expression method provided by this invention can be used in architectural light and shadow design scenarios. For example, by installing a set of dynamic adjustment mechanisms 3 and a light source system 1 on the facade of a large public building, and by adjusting the angle θsrc between the light source system 1 and the building surface and the position dop of the obstruction 4, rich and colorful light and shadow patterns can be generated. These patterns can not only dynamically switch with changes in time and environment, but can also be combined with other artistic elements to create a unique visual experience.

[0041] Furthermore, this invention can also be applied to complex lighting and shadow scenarios involving multiple light sources working together. For example, in stage performances, by combining point light sources with surface light sources, and using a dynamic adjustment mechanism 3 to control the projection direction and angle θsrc of each light source module, while simultaneously coordinating with changes in the position of the obstruction 4, a layered and dynamic lighting and shadow effect can be created. This multi-light source collaborative working mode not only enhances the flexibility of lighting and shadow expression but also strengthens the audience's immersion.

[0042] To verify the practical effects of this invention, multiple comparative experiments were conducted in this embodiment. The experimental results show that by introducing the obstruction 4 and the dynamic adjustment mechanism 3, this invention can achieve precise light and shadow control under different environmental conditions, significantly improving the adaptability and expressiveness of light and shadow art. Especially in complex spatial environments, this invention demonstrates excellent stability and controllability, providing strong technical support for the dynamic presentation of light and shadow art.

[0043] In summary, this invention successfully achieves the goal of dynamic light and shadow art expression by rationally arranging the light source system 1, projection surface 2, dynamic adjustment mechanism 3, obstruction 4, and spectrum analyzer 5, combined with precise measurement and modeling methods. To better enable those skilled in the art to fully understand and implement this invention, the specific implementation principle is further explained below with reference to a specific application scenario.

[0044] In the architectural lighting design scenario, the light source system 1 is first installed on one side of the building facade, and the angle θsrc between it and the projection surface 2 is adjusted to its initial position using a dynamic adjustment mechanism 3. At this time, the central axis of the light source system 1 needs to be precisely pointed to the center area of ​​the building surface to ensure the uniformity of light and shadow distribution. To achieve this goal, the dynamic adjustment mechanism 3 drives the horizontal displacement and angular deflection of the light source system through a built-in servo motor, with a control accuracy of 0.01°. Simultaneously, the spectrum analyzer 5 collects the light and shadow distribution data projected onto the building surface by the light source system 1 in real time and transmits the collected light intensity information to the central processing unit for subsequent model construction.

[0045] Subsequently, an obstruction 4 is introduced between the light source system 1 and the building surface, with its vertical spacing dop set to an initial value of 0.1m. The movement of the obstruction 4 is driven by a stepper motor in the dynamic adjustment mechanism 3, with each movement step Δdop set to 0.05m. After each movement, the spectral analyzer 5 collects a set of light and shadow distribution data and calculates the average light and shadow intensity under that condition. To comprehensively examine the impact of the positional change of the obstruction 4 on the light and shadow effect, the above measurement steps need to be repeated under different light source angles θsrc. For example, when θsrc is gradually adjusted from 30° to 60°, the dynamic adjustment mechanism 3 synchronously adjusts the vertical spacing dop of the obstruction 4 to obtain a series of light and shadow effect sample data containing the bivariate dop and θsrc.

[0046] Based on this, a nonlinear least squares method is used to fit and model the measurement data. Specifically, all measurement data are first categorized and organized according to combinations of dop and θsrc, and key parameters are extracted from each group of data. During the fitting process, special attention is paid to the occlusion effect of the occluder 4 on the light and shadow distribution, and this effect is quantified as a correction coefficient and added to the model. The final light and shadow effect model can be expressed as a function expression of dop and θsrc, where the polynomial term describes the trend of light and shadow intensity changing with the position of the occluder, while the exponential term characterizes the influence of changes in the light source angle on the light and shadow distribution.

[0047] During actual operation, the dynamic adjustment mechanism 3 adjusts the angle θsrc of the light source system 1 and the position dop of the obstruction 4 in real time according to environmental changes. For example, under strong daylight conditions, the contrast between light and shadow can be enhanced by increasing the vertical distance dop between the obstruction 4 and the building surface; while at night or in low-light environments, the dop value is reduced to generate a softer light and shadow effect. In addition, by independently controlling multiple modules of the light source system 1 through the dynamic adjustment mechanism 3, a multi-light source collaborative working mode can also be realized. For example, by combining point light sources and surface light sources, the point light source can be used to outline the building contours, while the surface light source fills the internal areas, thereby creating a layered and artistic light and shadow pattern.

[0048] To verify the practical effectiveness of this invention, multiple comparative experiments were conducted. The experimental results show that, through the synergistic effect of the dynamic adjustment mechanism 3 and the obstruction 4, this invention can achieve precise light and shadow control in complex spatial environments. Especially in the light and shadow design of building facades, this invention can not only dynamically switch light and shadow patterns according to changes in time and environment, but also combine with other artistic elements (such as music, light shows, etc.) to create a unique visual experience. This flexibility and adaptability significantly enhances the expressive power of light and shadow art, providing strong technical support for modern architectural light and shadow design.

[0049] In summary, this invention successfully achieves the goal of dynamic light and shadow art expression by rationally arranging the light source system 1, projection surface 2, dynamic adjustment mechanism 3, obstruction 4, and spectrum analyzer 5, and by combining precise measurement and modeling methods.

Claims

1. An artistic expression method based on dynamic light and shadow, characterized in that, Includes the following steps: S1: Set up a light source system (1) and a projection surface (2), and install a dynamic adjustment mechanism (3) between the light source system (1) and the projection surface (2); S2: Perform joint calibration of multiple light source modules of the light source system (1) to establish a basic light and shadow mapping reference link; S3: Adjust the angle θsrc and horizontal distance Lsp between the light source system (1) and the projection surface (2) through the dynamic adjustment mechanism (3) to stimulate a multi-dimensional light and shadow projection mode; S4: Set up an obstruction (4) between the light source system (1) and the projection surface (2), and adjust the obstruction. (4) The vertical distance dop between the light source system (1) and the projection surface (2) is measured in steps within the range of 0.1 meters to 1.5 meters to obtain multiple sets of light and shadow effect samples; Step S4 specifically refers to: fixing the horizontal distance between the light source system (1) and the projection surface (2), adjusting the vertical distance dop between the obstruction (4) and the projection surface (2), using a spectrum analyzer (5) to collect the light and shadow distribution data of the obstruction (4) under different vertical distances, and calculating the average value of the light and shadow intensity as the final light and shadow effect value corresponding to each measurement; S5: change The angle θsrc between the light source system (1) and the projection surface (2) is adjusted synchronously, and the vertical distance dop between the occluder (4) and the projection surface (2) is adjusted simultaneously. The above step S4 is repeated, and the boundary value of the occluder (4) is obtained in the range of 0.1 meters to 1.5 meters. A light and shadow effect relationship matrix containing the two variables dop and θsrc is constructed. S6: The measurement data is subjected to bivariate joint fitting using the nonlinear least squares method to establish a light and shadow effect model with occlusion compensation. The above step S6 specifically refers to: the light and shadow effect model constructed in step S5 above is used to obtain the boundary value of the occluder (4) within the range of 0.1 meters to 1.5 meters. The model is fitted with parameters using the least squares method to obtain the correction values ​​of each parameter of the light and shadow effect model. The final light and shadow effect model is obtained by using the correction values ​​of each parameter. The expression of the final light and shadow effect model is: I(dop,θsrc)=I0×exp(-α×dop^β)+ε where, dop represents the vertical distance between the occluder (4) and the projection surface (2), I0 represents the light and shadow intensity value at the reference distance, α and β represent the coefficients of the polynomial, and ε represents the random fluctuation that follows a normal distribution with a mean of 0 and a standard deviation of σ.

2. The artistic expression method based on dynamic light and shadow according to claim 1, characterized in that, The step S1 specifically refers to setting up a light source system (1), a projection surface (2), and a dynamic adjustment mechanism (3), wherein the angle θsrc between the light source system (1) and the projection surface (2) is adjustable, and the dynamic adjustment mechanism (3) is placed between the light source system (1) and the projection surface (2).

3. The artistic expression method based on dynamic light and shadow according to claim 1, characterized in that, The step S2 specifically refers to: the light source system (1) is connected to the spectrum analyzer (5) through optical fiber, and the light source system (1) is equipped with multiple light source modules to conduct experiments, thereby establishing a basic light and shadow mapping reference link.

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