A light and shadow linkage type paper-cut dynamic projection method

Abstract

The application discloses a light and shadow linkage type paper-cut dynamic projection method, and core steps of the method comprise: paper-cut and light and shadow parameter linkage initialization, analysis of paper-cut basic contour layer, detail decoration layer and hollow light transmission layer characteristics and establishment of a light and shadow parameter library, and initialization of linkage parameters; paper-cut dynamic adjustment and real-time light and shadow adaptation, dynamic optimization of light and shadow parameters is driven through paper-cut posture data, and two-way adaptation is formed; scene feedback driven linkage optimization, adjustment of paper-cut and light and shadow states based on environmental light, audience interaction and other data, and compensation of projection surface distortion; multi-dimensional light and shadow layered rendering, paper-cut level is strengthened through multi-light source cooperation; dynamic calibration and projection output, cumulative deviation is corrected, and an optimized picture is output. The innovation lies in the construction of a paper-cut-light scene three-dimensional linkage system. The application improves projection artistic expressiveness and scene adaptability, enhances interactive experience, is suitable for multi-scenarios such as cultural tourism exhibition and interactive exhibition, and provides support for digital dissemination of paper-cut culture.

Description

Technical Field

[0001] This invention relates to the intersection of paper-cutting culture and digital projection technology, specifically a light and shadow linkage method for dynamic projection of paper-cutting. Background Technology

[0002] Paper-cutting projection technology is an important direction for combining traditional paper-cutting art with modern projection technology, but its current applications have significant technical bottlenecks, making it difficult to meet the dynamic presentation needs of diverse scenarios:

[0003] 1. The projection is static, and the paper-cutting and light and shadow lack a linkage logic - existing methods mostly use fixed paper-cutting patterns combined with static light and shadow parameters for projection. The paper-cutting posture and outline cannot be dynamically adjusted with changes in light and shadow, and the intensity and angle of light and shadow cannot respond to the optimization of paper-cutting features, resulting in a stiff projection effect and a lack of artistic appeal.

[0004] 2. Weak scene adaptability and lack of adaptive adjustment mechanism - The projection parameters (such as light source color temperature and projection range) are mostly preset fixed values, which cannot be dynamically optimized according to changes in ambient light, audience interaction, or display theme switching. The adaptability is poor in cultural and tourism scenes with alternating light and dark or children's scenes with high interactive needs.

[0005] 3. The lighting and shadow rendering is too simple and does not form a layered and linked effect. The paper-cut outline is projected by a single light source without combining the pattern layers (basic layer, decorative layer) of the paper-cut to design a corresponding lighting and shadow layer rendering strategy. It cannot present the three-dimensional sense of paper-cut and the texture of details, and the difference from traditional static projection is small.

[0006] 4. Lack of interactive feedback loop and insufficient user participation - Most methods are one-way projection output, lacking the perception and feedback mechanism for audience movements and environmental changes. They cannot drive the linkage adjustment of paper cutting and light and shadow through external input, making it difficult to achieve an immersive interactive experience. Summary of the Invention

[0007] The purpose of this invention is to provide a light and shadow linkage-based dynamic projection method for paper-cutting, which aims to solve the problems of lack of linkage between paper-cutting and light and shadow, poor scene adaptability, monotonous rendering and insufficient interaction in the existing technology, and to achieve deep integration and dynamic presentation of paper-cutting art and light and shadow technology.

[0008] To solve the above-mentioned technical problems, the present invention provides a light and shadow linkage paper-cutting dynamic projection method, comprising the following steps:

[0009] (1) Initialization of paper cutting and lighting parameters linkage:

[0010] 1.1 Perform pattern layer analysis on the target paper-cutting, extract feature data of the basic outline layer, detail decoration layer, and hollow light-transmitting layer, and determine the dynamic adjustable dimensions of each layer (such as the opening angle of the basic outline layer and the rotation range of the detail decoration layer).

[0011] 1.2 Establish a light and shadow parameter library, including parameters such as light source type (area light source, point light source, line light source), color temperature, intensity, projection angle and projection area range, and associate each parameter with the adaptation rules of paper-cutting layer features;

[0012] 1.3 Collect initial environmental data of the projection scene (ambient light intensity, spatial size, audience activity area), combine paper-cutting layer features and light and shadow adaptation rules, initialize paper-cutting dynamic parameters and basic light and shadow parameters, and set linkage trigger thresholds (such as ambient light intensity fluctuation value, interactive action recognition accuracy).

[0013] (2) Dynamic adjustment of paper cutting and real-time adaptation of light and shadow:

[0014] 2.1 The paper-cutting dynamic driving module is started based on the initialization parameters, which controls the basic outline layer to complete the opening and closing action according to the preset trajectory, and collects the posture data of each layer of paper-cutting in real time (such as opening and closing angle, rotation position, and area of ​​the hollow area).

[0015] 2.2 When the paper-cutting posture data meets the linkage triggering conditions, the light and shadow control module automatically calls the light and shadow parameter library data and dynamically adjusts the light source parameters: when the opening angle of the basic outline layer increases, the intensity of the surface light source is simultaneously enhanced and the projection angle is reduced to highlight the outline lines; when the detail decoration layer rotates, the point light source is activated to alternately project and enhance the texture shadows.

[0016] 2.3 Real-time acquisition of brightness distribution data of the projected image. If the brightness deviation of a certain area exceeds the threshold, it is fed back to the paper-cutting dynamic module to fine-tune the opening of the paper-cutting hollow light-transmitting layer and adjust the color temperature of the light source in the corresponding area to achieve two-way adaptation between paper-cutting and light and shadow.

[0017] (3) Scene feedback-driven linkage optimization:

[0018] 3.1 Real-time collection of scene dynamic data through the environmental sensing module, including changes in ambient light intensity, audience interaction actions (such as gestures and body postures), and deviations in the flatness of the projection surface;

[0019] 3.2 Feature extraction of scene dynamic data: When the ambient light is enhanced, the contrast of light and shadow is automatically increased and the paper-cutting hollow area is enlarged; when the audience's pointing action is detected, the point light source is focused on the corresponding paper-cutting area, and the paper-cutting detail layer in that area is slightly rotated.

[0020] 3.3 If a deviation in the flatness of the projection surface is detected, causing light and shadow distortion, the projection angle is adjusted through a light and shadow distortion correction algorithm. At the same time, the paper-cutting dynamic module is linked to fine-tune the posture of the paper-cutting in the corresponding area to compensate for the distortion error.

[0021] (4) Multi-dimensional light and shadow layered rendering and paper-cutting linkage:

[0022] 4.1 Based on the light transmission characteristics of each layer of paper cutting, multi-light source layer rendering is started: surface light source projects the basic outline layer to form the overall light and shadow background color, line light source outlines the texture edge of the detail decoration layer, and point light source forms light spot effect through the hollow light transmission layer;

[0023] 4.2 Real-time acquisition of lighting and shadow rendering effect data at each level (such as background color uniformity, texture edge clarity, and light spot distribution density), comparison with preset standards; if the texture of the detail decoration layer is blurry, increase the intensity of the line light source and reduce the rotation speed of the paper-cut detail layer; if the light spot distribution is uneven, adjust the opening and closing synchronization of the hollowed-out light-transmitting layer.

[0024] 4.3 Establish a feedback loop between rendering effects and paper-cutting dynamics, and convert rendering deviation data into paper-cutting dynamic parameter adjustment instructions to ensure that the lighting effects at each level are accurately matched with the paper-cutting features.

[0025] (5) Dynamic calibration and projection output:

[0026] 5.1 After each complete paper-cutting dynamic cycle, the linkage calibration is initiated to collect paper-cutting posture data, light and shadow parameter data, and scene feedback data, which are compared with the initial parameters to calculate the cumulative deviation;

[0027] 5.2 Based on the cumulative deviation, a calibration command is generated to adjust the compensation amount of the paper-cutting dynamic trajectory and the correction value of the light and shadow parameters. If there is a delay in the paper-cutting opening and closing action, the response speed of the drive module is optimized, and the light and shadow triggering timing is fine-tuned.

[0028] 5.3 After calibration, output the optimized dynamic projection image. If you need to switch the display theme, repeat steps 1.2-5.2 and update the paper-cutting layer features and light and shadow adaptation rules based on the new theme.

[0029] In summary, due to the adoption of the above-mentioned technologies, the beneficial effects of this invention are:

[0030] 1. This invention breaks through the limitations of existing technology's unidirectional projection by constructing a three-dimensional linkage system of paper-cutting dynamic features, light and shadow parameters, and scene data. It achieves bidirectional closed-loop linkage of paper-cutting posture adjustment, light and shadow parameter adaptation, and scene feedback optimization, thereby enhancing the dynamic performance of projection.

[0031] 2. This invention proposes a linkage logic between hierarchical dynamic control of paper-cutting and layered rendering of light and shadow. It designs exclusive light and shadow strategies for different paper-cutting levels and enhances the three-dimensional sense of paper-cutting and the texture of details through the synergy of multiple light sources, thus solving the problem of the single nature of traditional projection rendering.

[0032] 3. This invention introduces a scene dynamic feedback driving mechanism to transform real-time data such as ambient light changes and audience interaction into linkage adjustment commands, thereby achieving scene adaptation of the projection effect and broadening the scope of applicable scenarios. It also establishes a collaborative compensation mechanism for light and shadow distortion and paper-cutting posture, using a dual approach of light and shadow algorithm correction and dynamic fine-tuning of paper-cutting to solve the problem of projection surface distortion and improve projection accuracy in complex scenes. Attached Figure Description

[0033] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention, making other features, objects, and advantages of the invention more apparent. The illustrative embodiments of the invention illustrated in the drawings and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 This is a diagram of the method of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific context of the specification.

[0038] This invention provides a light and shadow linkage dynamic projection method for paper cutting.

[0039] Example 1: Cultural tourism performance scene (Theme: Dynamic peony paper-cut projection)

[0040] Initialization of paper-cutting and lighting parameter linkage: 1.1 Layered analysis of peony paper-cutting: Basic outline layer (petal outline, dynamically adjustable dimension is opening angle 0-90°), detailed decoration layer (petal veins, dynamically adjustable dimension is rotation amplitude 0-30°), hollowed-out light-transmitting layer (hollowed-out stamen, dynamically adjustable dimension is opening area 0-5cm²); 1.2 Establishment of lighting parameter library: surface light source (color temperature 5000K, intensity 0-1000lux), line light source (color temperature 6000K, intensity... 0-800 lux), point light source (color temperature 4500K, intensity 0-600 lux), the adaptation rule is: for every 10° increase in the petal opening and closing angle, the intensity of the surface light source increases by 100 lux; 1.3 Collect initial data of the performance venue: ambient light intensity 300 lux, space size 10m×8m, audience activity area concentrated in the front 3m range, initial petal opening and closing cycle 10s, surface light source intensity 500 lux, linkage trigger threshold set to ambient light fluctuation ≥100 lux.

[0041] Dynamic adjustment of paper cutting and real-time adaptation of light and shadow: 2.1 Activate the dynamic driving module of paper cutting to control the movement of peony petals along the trajectory of "closed-half-open-fully-open-half-closed", and collect the opening and closing angle of the petals in real time (e.g., 30° at t=2s, 90° at t=5s); 2.2 When t=5s, the petals are fully open (angle 90°, meeting the linkage trigger condition), and the light and shadow control module automatically increases the intensity of the surface light source to 900 lux, and reduces the projection angle from 60° to 45° to highlight the outline of the petals; at the same time, it starts the rotation of the detail decoration layer (amplitude 30°), and the point light source is alternately projected (frequency 2 times / second) to enhance the vein shadow; 2.3 Collect the projection screen data and find that the brightness of the petal edge is too low (deviation 150 lux), and feed it back to the paper cutting module to adjust the opening area of ​​the edge petal hollow layer from 3cm² to 5cm², and at the same time reduce the color temperature of the surface light source in the corresponding area from 5000K to 4800K, and correct the brightness deviation to within 50 lux.

[0042] Scene feedback-driven linkage optimization: 3.1 The environmental sensing module detected the lighting enhancement during the performance (ambient light increased from 300 lux to 500 lux), and simultaneously identified the audience's movement to the left; 3.2 The lighting module immediately increased the overall lighting contrast from 1.2 to 1.5, while keeping the surface light source intensity unchanged at 900 lux; it activated the focusing of the point light source in the left area, shifted the projection angle of the three point light sources to the left by 15°, and simultaneously increased the rotation amplitude of the left petal detail layer to 40° to attract the audience's attention; 3.3 A slight bulge was detected on the left side of the stage projection surface (causing local lighting distortion), and the projection angle of this area was increased by 10° through the lighting algorithm, while the opening and closing angle of the corresponding petals was reduced by 5°, completely eliminating the distortion.

[0043] Multi-dimensional light and shadow layered rendering and paper-cutting linkage: 4.1 Start layered rendering: The surface light source projects the outline of the petals to form a pink background, the line light source projects along the vein trajectory to form dark pink edge lines, and the point light source passes through the hollowed-out stamen to form yellow light spots; 4.2 Collect rendering effect data and find that the edges of the petal veins are blurred (clarity deviation of 20%), immediately increase the intensity of the line light source from 600 lux to 800 lux, and at the same time reduce the rotation speed of the detail decoration layer from 5° / s to 3° / s, and improve the clarity of the veins to the preset standard; 4.3 Detect uneven distribution of light spots (dense on the right and sparse on the left), feed back to the paper-cutting module, and simultaneously increase the opening area of ​​the hollowed-out stamen layer on the left to 5cm², while keeping the right side at 3cm², and the uniformity of the light spot distribution meets the standard.

[0044] Dynamic calibration and projection output: 5.1 After the 110s dynamic cycle ends, the linkage calibration found that the petal opening and closing was delayed by 0.3s, the light and shadow trigger timing synchronization was delayed by 0.3s, and the cumulative deviation was 0.6s; 5.2 A calibration command was generated to improve the response speed of the paper-cutting driving module by 20% and advance the light and shadow trigger timing by 0.3s. After correction, the delay was shortened to less than 0.1s; 5.3 When switching to the theme of "Peony Blooming - Butterfly Surrounding", the paper-cutting layer was updated (a butterfly outline layer was added, and the dynamic dimension was the flight trajectory). The light and shadow parameter library added a butterfly-specific line light source (color temperature 5500K). The linkage process was repeated to achieve smooth theme switching.

[0045] Example 2: Interactive Scene for Children (Theme: Cartoon Animal Paper-cut Projection)

[0046] Linkage initialization: Analyze the cartoon rabbit paper-cut layers (basic outline layer: ear opening and closing angle 0-60°, body swaying amplitude 0-20°; detail layer: whisker vibration frequency 0-5 times / second; cutout layer: eye blinking amplitude 0-10mm), establish a light and shadow library (warm light color temperature 3000K-4000K), collect the initial indoor ambient light of 200 lux, initialize the ear opening and closing cycle to 5s, and set the gesture recognition accuracy ≥90% as the linkage threshold.

[0047] Dynamic adaptation and interactive response: The rabbit's ears open and close when the rabbit starts moving. At t=3s, the ears are fully open (60°) and the intensity of the surface light source increases from 400 lux to 700 lux. When the child's "waving" gesture is detected (meeting the threshold), the point light source focuses on the rabbit's head and drives the ears to shake rapidly 3 times. The whiskers vibration frequency increases to 5 times / second, which arouses the child's interest in interaction.

[0048] Scene optimization and calibration: When a child is detected approaching the projection surface (distance ≤1m), the projection area is automatically reduced (from 1m×1m to 0.6m×0.6m), and the light source intensity is reduced to 500 lux to avoid glare; the projection surface is distorted due to the unevenness of the tabletop, so the light and shadow projection angle is adjusted and the rabbit's body swaying amplitude is finely adjusted by 10° to correct the distortion; after a 5-second cycle calibration, the 0.2-second delay between the opening and closing of the ears and the triggering of light and shadow is eliminated to ensure smooth interaction.

[0049] Beneficial effects

[0050] Enhancing the artistic expressiveness of dynamic projection—through the three-dimensional linkage of paper cutting and light and shadow, presenting a rich and dynamic visual effect, solving the problem of the stiffness of traditional projection, and enhancing the appeal of paper cutting art;

[0051] Enhance scene adaptability—based on real-time feedback of environmental and interactive data, automatically optimize projection parameters and paper-cutting dynamics to meet the differentiated needs of various scenarios such as cultural tourism and children;

[0052] Enhance the user immersive experience – through interactive action-driven linkage adjustments, construct a two-way interactive closed loop to enhance audience participation, especially suitable for scenarios with high interaction requirements;

[0053] Ensuring projection accuracy in complex scenes—by using coordinated compensation of light and shadow with paper-cutting techniques, problems such as projection surface distortion and ambient light interference are solved, improving the practicality and reliability of the method.

Claims

1. A light and shadow linkage dynamic projection method for paper cutting, characterized in that: Includes the following steps: S1: Initialization of Paper-cutting and Lighting Parameter Linkage: Analyze the pattern layers of the target paper-cutting, extract feature data of the basic outline layer, detail decoration layer, and hollowed-out light-transmitting layer, and determine the dynamically adjustable dimensions of each layer; establish a lighting parameter library including light source type, color temperature, intensity, projection angle, and projection area range, and associate each parameter with the adaptation rules of the paper-cutting layer features; collect initial environmental data of the projection scene, combine the paper-cutting layer features with the lighting adaptation rules, initialize the dynamic parameters of the paper-cutting and the basic lighting parameters, and set the linkage trigger threshold; S2: Dynamic Adjustment and Real-time Light and Shadow Adaptation of Paper Cutting: The dynamic paper cutting driving module is activated to control the movement of each layer of the paper cutting along a preset trajectory and collect the posture data of each layer of the paper cutting in real time. When the paper cutting posture data meets the linkage triggering conditions, the light and shadow control module calls the light and shadow parameter library data to dynamically adjust the light source parameters, thereby achieving the adaptation between paper cutting and light and shadow. The brightness distribution data of the projected image is collected. If there is a brightness deviation, it is fed back to the dynamic paper cutting module to fine-tune the paper cutting posture and synchronously adjust the light source parameters of the corresponding area, forming a two-way adaptation. S3: Scene feedback-driven linkage optimization: Real-time collection of scene dynamic data through the environmental sensing module, including changes in ambient light intensity, audience interaction actions, and projection surface flatness deviation; feature extraction of scene dynamic data, and dynamic adjustment of light and shadow parameters and paper-cutting posture based on the extraction results; If a deviation in the flatness of the projection surface is detected that causes light and shadow distortion, the projection angle is adjusted through a light and shadow distortion correction algorithm. At the same time, the paper-cutting dynamic module is linked to fine-tune the paper-cutting posture of the corresponding area to compensate for the distortion error. S4: Multi-dimensional layered rendering of light and shadow and paper-cutting linkage: Based on the light transmission characteristics of each layer of paper-cutting, multi-light source layered rendering is initiated. The surface light source projects the basic outline layer to form the light and shadow background color, the line light source outlines the texture edge of the detailed decorative layer, and the point light source forms the light spot effect through the hollowed-out light transmission layer; the light and shadow rendering effect data of each layer is collected and compared with the preset standard. The light source parameters and paper-cutting dynamic parameters are adjusted according to the comparison results to establish a feedback loop between the rendering effect and the paper-cutting dynamics; S5: Dynamic Calibration and Projection Output: After each paper-cutting dynamic cycle is completed, linkage calibration is initiated to collect paper-cutting posture data, light and shadow parameter data, and scene feedback data, and calculate the cumulative deviation; based on the cumulative deviation, calibration instructions are generated to adjust the paper-cutting dynamic trajectory compensation amount and light and shadow parameter correction value; after calibration is completed, the optimized dynamic projection image is output. If it is necessary to switch the display theme, the paper-cutting layer features and light and shadow adaptation rules are updated and steps 1)-5 are repeated.

2. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The dynamically adjustable dimensions of each layer of paper cutting mentioned in step 1) include the opening and closing angle of the basic outline layer, the rotation range of the detail decoration layer, and the opening area of ​​the hollowed-out light-transmitting layer.

3. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The initial environmental data of the scene mentioned in step 1) includes ambient light intensity, spatial size and audience activity area, and the linkage trigger threshold includes ambient light intensity fluctuation value and interactive action recognition accuracy.

4. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The adjustment logic of the light and shadow parameters in step 2) is as follows: when the opening angle of the basic outline layer increases, the intensity of the surface light source is simultaneously enhanced and the projection angle is reduced; when the detail decoration layer rotates, the point light source is started to project alternately; when the opening area of ​​the hollow light-transmitting layer is adjusted, the color temperature of the light source in the corresponding area is simultaneously optimized.

5. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The audience interaction actions mentioned in step 3) include gestures and body postures. When the audience's pointing action is detected, the point light source is focused on the corresponding paper-cutting area and the paper-cutting detail layer in that area is driven to rotate.

6. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The adaptation rules for the layered rendering of light and shadow in step 4) are as follows: when the uniformity of the background color of light and shadow does not meet the preset standard, adjust the projection range of the surface light source; when the clarity of the texture edge is insufficient, increase the intensity of the line light source and reduce the rotation speed of the paper-cut detail layer; when the light spot distribution is uneven, adjust the opening and closing synchronization of the hollowed-out light-transmitting layer.

7. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The cumulative deviation mentioned in step 5) includes the paper-cutting dynamic trajectory delay deviation and the light and shadow trigger timing deviation. The calibration instructions include the paper-cutting drive module response speed optimization instruction and the light and shadow trigger timing adjustment instruction.

8. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The environmental sensing module mentioned in step 3) includes a brightness sensor, a gesture recognition sensor, a limb posture capture device, and a projection surface flatness detection sensor.

9. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The feedback cycle of the bidirectional adaptation described in step 2) does not exceed 0.5 seconds to ensure the dynamic continuity of the projected image.

10. The light and shadow linkage dynamic projection method for paper cutting according to claim 1, characterized in that, The linkage control of steps 1)-5) is implemented through a PLC controller or embedded system, supporting multiple theme switching and real-time parameter updates.

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