Optimization Method for Process-Free CTP Plate Making Based on Multispectral Spatial Mapping Simulation

Abstract

This invention relates to the fields of industrial control and image processing technology, and discloses a method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation. This invention aims to solve the problem that existing CTP plate-making equipment without processing often results in blurry images or dirty backgrounds due to constant energy exposure without considering coating physical tolerances. This invention achieves point-by-point quantitative matching of laser thermal energy and microscopic physical thickness by spatially mapping digital images with a coating thickness matrix generated by multispectral scanning, performing pre-processing data simulation calculations, and converting energy deviations into time-triggered sequences to dynamically adjust laser energy. This reduces image defects caused by coating tolerances. Furthermore, it implements adaptive threshold constraints and energy smoothing based on operating parameters, ensuring the consistency and stability of plate-making quality under various operating conditions.

Description

Technical Field

[0001] This invention relates to the fields of industrial control and image processing technology, and more specifically, to a method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation. Background Technology

[0002] With the development of green printing technology, the process of computer-to-plate (CTP) without processing, based on industrial control computers, has been widely used in the printing manufacturing industry due to its environmentally friendly advantage of not requiring subsequent chemical development. In existing processing-free CTP plate-making systems, the industrial control computer is mainly responsible for receiving pre-press digital image files, converting them into dot matrix data, and then driving the exposure cylinder to rotate at high speed while controlling the laser head to expose the plate point by point according to the set standard laser energy. This conventional industrial control logic is based on an idealized premise, that is, assuming that the photosensitive coating on the entire surface of the processing-free plate is a uniform and consistent medium, and the laser generator only needs to mechanically execute unidirectional constant power output where there is an image and no light is emitted where there is no image to complete the reproduction of the pre-press image.

[0003] However, in actual industrial manufacturing and production, pretreatment-free printing plates are limited by the coating process, and their surface coating inevitably has microscopic physical tolerances in thickness. Because the pretreatment process completely eliminates the chemical development step, it loses the tolerance buffer provided by the developer concentration in traditional plate-making processes, which compensates for exposure latitude. This makes the plate material extremely demanding on the matching precision of laser thermal energy. When existing industrial control equipment performs blind exposure with a constant standard laser energy, areas with thicker coatings often experience incomplete physical phase transitions because heat cannot fully penetrate, easily leading to dot loss and blurring of the image during subsequent water-cooled printing. Conversely, areas with thinner coatings are prone to burning the underlying aluminum metal due to excessive localized heat, resulting in dirty printing underlay. This existing control method, which relies solely on digital image data for constant exposure and completely deviates from the actual microscopic physical state of the printing plate, leads to extremely unstable image reproduction quality of pretreatment-free printing plates, making it difficult to meet the demands of high-quality and complex printing conditions. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides an optimization method for the CTP plate-making process without processing based on multispectral spatial mapping simulation, which solves the problem that existing CTP plate-making equipment without processing easily leads to blurry images or dirty backgrounds due to constant energy exposure without considering the physical tolerance of the coating.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] This invention provides a process optimization method for CTP plate making without processing based on multispectral spatial mapping simulation, which is executed by computer equipment and includes the following steps:

[0008] S1. An industrial control computer acquires pixel dot matrix image data; the industrial control computer drives the exposure roller to rotate at a low speed and controls the multispectral image sensor to scan the unprocessed plate and generate a digital multispectral matrix reflecting the initial thickness distribution of the coating.

[0009] S2. The industrial control computer uses the mechanical coordinate system of the exposure roller as a reference to spatially map the pixel dot matrix image data with the digital multispectral matrix to establish a comprehensive data array containing image information and initial coating thickness information.

[0010] S3. The industrial control computer reads the integrated data array to perform a processing-free exposure simulation, simulates physical phase transition defects under standard laser energy based on the local coating thickness, and generates an energy deviation map covering the entire plate.

[0011] S4. The industrial control computer generates dynamic exposure control instructions based on the energy deviation diagram, and dynamically adjusts the laser exposure energy for pixel areas of different thicknesses during the high-speed rotation of the exposure roller in the plate-making process.

[0012] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, step S1 specifically includes:

[0013] The industrial control computer controls the multispectral image sensor to sequentially emit detection light of various different wavelengths; the detection light penetrates the surface coating of the untreated plate and is reflected in the exposed aluminum metal substrate; the multispectral image sensor receives the reflected light and converts the intensity of the reflected light into a digital signal, and then generates a digital multispectral matrix based on the physical correspondence that the thicker the coating, the weaker the reflected light.

[0014] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, step S2 specifically includes:

[0015] The industrial control computer sets the rotation starting point of the exposure roller and the axial starting point of the laser head as a unified reference. Based on the reference, the industrial control computer initiates spatial mapping and introduces multi-dimensional physical deformation compensation parameters during the mapping process. It multiplies the digital image reference coordinate distance with the thermodynamic scaling ratio caused by temperature changes to obtain the intermediate offset coordinates. The surface tension deformation increment caused by the roller clamp stretching is superimposed on the intermediate offset coordinates to calculate the actual physical coordinate distance of the pixel on the surface of the untreated plate that has undergone physical deformation. This corrects the spatial size deviation of the untreated plate caused by the combined influence of environmental factors and mechanical stress. When the pixel density of the pixel array image data does not match the grid of the digital multispectral matrix, the average value of the surrounding adjacent thickness grids is extracted for filling and matching, and finally a comprehensive data array is established.

[0016] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, step S3 specifically includes:

[0017] The industrial control computer pre-sets a standard laser energy with aging compensation parameters and executes the following judgment logic during the processing-free exposure simulation: if the initial coating thickness value read in the integrated data array is greater than a set threshold, it is determined that the standard laser energy cannot penetrate the coating, causing the underlying adhesion failure and resulting in a physical phase transition defect of blurred image; if the initial coating thickness value read in the integrated data array is less than the set threshold, it is determined that the standard laser energy is excessive, causing the substrate to burn through and resulting in a physical phase transition defect of printing dirt.

[0018] Based on the attenuation characteristics of the optical medium, the industrial control computer combines the difference between the initial coating thickness and the system's preset coating standard reference thickness with the energy attenuation absorption constant as an exponential term. According to the nonlinear exponential attenuation law, it calculates the compensating heat that causes the thick coating to undergo a complete phase change and the deducting heat that prevents the ablation of the underlying aluminum substrate. The compensating heat and deducting heat are then used as energy increase or decrease values ​​and stitched together to generate an energy deviation map.

[0019] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, the step of generating dynamic exposure control instructions based on the energy deviation map in S4 specifically includes:

[0020] The industrial control computer extracts the rotational speed of the exposure roller during its stable operation and the physical speed of the laser head moving along the sliding track. Combining the real-time position signal fed back by the hardware encoder with the fixed time delay difference of the electrical signal transmission, the theoretical waiting time is obtained by dividing the physical angular distance between the coordinates of the pixel area to be adjusted extracted from the energy deviation map and the current physical position of the laser head by the rotational speed. Then, the fixed time difference of the combined delay of the electrical signal transmission and the current response is directly subtracted from the theoretical waiting time to obtain the absolute trigger moment after advance compensation. This trigger moment is used as the time-axis-based trigger moment, and the trigger moment is bound to the corresponding energy adjustment value to generate a strictly time-ordered sequence of trigger moments as a dynamic exposure control command.

[0021] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, step S4, which involves dynamically adjusting the laser exposure energy for pixel regions of different thicknesses, specifically includes:

[0022] The industrial control computer executes the dynamic exposure control command in conjunction with the current response delay parameter of the laser drive circuit board: when the trigger moment of the corresponding thicker coating area is reached, a control signal is output to extend the pulse emission time of the laser light-emitting tube; when the trigger moment of the corresponding thinner coating area is reached, a control signal is output to reduce the output power of the laser light-emitting tube; and when the laser head sweeps across the normal coating thickness area, the laser light-emitting tube is controlled to immediately restore to the preset standard laser energy.

[0023] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, the industrial control computer further performs the following operations before executing the dynamic exposure control command:

[0024] The operating parameters of the target printing task are parsed and extracted from the prepress operation management system. Based on the operating parameters, the industrial control computer sets a maximum limit threshold for the pulse emission time of the extended laser light-emitting tube to prevent the heat from spreading laterally and causing abnormal dot expansion due to unlimited extension of the emission time. At the same time, a minimum limit threshold is set for reducing the output power of the laser light-emitting tube to prevent the laser thermal energy from failing to reach the minimum activation temperature required for the physical phase change of the coating due to excessive reduction of power.

[0025] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, if the image detail resolution in the operating parameters is greater than a preset high-precision threshold, the industrial control computer derives a dynamic amplification multiplier based on the proportion of the image detail resolution exceeding the high-precision threshold and the thermal diffusion compensation coefficient. The preset basic maximum limit threshold is multiplied by the dynamic amplification multiplier to dynamically increase the maximum limit threshold, and a pulse control signal reaching the increased maximum limit threshold is output. By compensating for the heat dissipated by the pixels to the surroundings, the physical phase transition bonding force of the coating corresponding to the pixels is improved, ensuring the fidelity of image detail reproduction.

[0026] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, if the estimated total print volume in the operating parameters is greater than the preset printing durability threshold, the industrial control computer raises the minimum limit threshold. When it is determined that there is a thin coating area in the comprehensive data array, a control signal is output according to the raised minimum limit threshold. By maintaining the preset thermal energy, the molecules inside the coating are deeply cross-linked and hardened to form a film, thereby improving the overall printing durability of the plate material.

[0027] As a preferred embodiment of the CTP plate-making process optimization method based on multispectral spatial mapping simulation described in this invention, if the area of ​​the same image depth information contiguous in the working condition parameters is greater than a preset real-world threshold, the industrial control computer extracts the energy difference between the two sides of the spatial boundary between the thicker and thinner coating areas, and generates multiple virtual transition pixels at the spatial boundary. Based on the steady-state energy value of the starting side of the spatial boundary, the energy difference is discretized and allocated according to the spatial sequence position of each virtual transition pixel at the spatial boundary, and the virtual transition pixels are given a smooth and gradual transition energy value. Based on the transition pixels, the dynamic exposure control command is modified so that the adjusted laser exposure energy presents a stable state of linear increase and linear decrease on the transition pixels, eliminating the visual stripe defect caused by the instantaneous step jump in energy in the area of ​​the same image depth information contiguous.

[0028] The beneficial effects of this invention are as follows: By using a mechanical coordinate system as a unified reference, spatial mapping of pixel array images and multispectral thickness matrices is performed, and multidimensional physical deformation compensation is introduced, achieving precise alignment between digital images and physical entity features. Based on this, the invention employs data simulation calculations to pre-predict physical phase transition defects and converts energy deviations into a time-triggered sequence for advance compensation to dynamically adjust laser energy. This changes the traditional blind printing mode of constant energy exposure, effectively avoiding dot loss, blurring, or ablation caused by coating tolerances, and significantly improving the stability of image reproduction quality. Furthermore, by extracting specific working condition parameters and executing adaptive processing branches, and utilizing dynamic threshold constraints and virtual pixel interpolation allocation, the invention objectively ensures the consistency of plate-making quality under various working conditions, including high-precision detail reproduction, high printing durability maintenance, and large-area solid smooth printing. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the main process of the CTP plate-making process optimization method based on multispectral spatial mapping simulation;

[0031] Figure 2 This is a schematic diagram of the multidimensional spatial mapping and compensation sub-process provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the exposure simulation and energy deviation calculation sub-process provided in an embodiment of the present invention;

[0033] Figure 4 This is a flowchart illustrating the adaptive dynamic adjustment strategy for multiple operating conditions provided in an embodiment of the present invention. Detailed Implementation

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "example" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearance of an embodiment in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0037] Example 1

[0038] Reference Figures 1-3 This is the first embodiment of the present invention, which provides a process optimization method for CTP plate-making without processing based on multispectral spatial mapping simulation. As the basic core implementation framework of the present invention, it fully constructs the basic plate-making process from prepress digital driving, underlying physical scanning, exposure data simulation to high-speed dynamic closed-loop control, including the following steps:

[0039] S1. The industrial control computer acquires pixel dot matrix image data; the industrial control computer drives the exposure roller to rotate at low speed and controls the multispectral image sensor to scan the unprocessed plate and generate a digital multispectral matrix that reflects the initial thickness distribution of the coating.

[0040] S1 specifically includes:

[0041] An industrial control computer controls a multispectral image sensor to sequentially emit multiple probe rays of different wavelengths. The probe rays penetrate the surface coating of the untreated plate and are reflected in the exposed aluminum metal substrate. The multispectral image sensor receives the reflected rays and converts the intensity of the reflected rays into digital signals. Based on the physical correspondence that the thicker the coating, the weaker the reflected rays, a digital multispectral matrix is ​​generated.

[0042] In the prepress data processing stage, the raw files received by the system are typically design artworks containing continuous tonal color information. However, actual industrial printing processes represent color depth through the density of ink dots on the printing plate. Therefore, the industrial control computer first uses a raster image processor to convert the continuous tonal design artworks into pixel-matrix image data composed of countless pixels that only contain two states: exposed or unexposed. This data serves as the digital exposure base map to guide the subsequent laser head operation. After completing the digital base conversion, the system enters the physical scanning stage of the physical printing plate. Considering that the substrate of the unprocessed printing plate is relatively thin, the strong centrifugal force generated by high-speed rotation can easily cause the edge of the printing plate to detach from the roller surface and deform. Furthermore, high-frequency vibration can severely interfere with the receiving accuracy of the optical sensor. Therefore, the industrial control computer issues instructions to the servo drive system to operate at a low speed and smoothly.

[0043] As the exposure cylinder rotates smoothly, a multispectral image sensor, closely attached to the surface of the printing plate, is activated. Since single-wavelength light has limited penetration into the coating and cannot fully reflect its internal three-dimensional structure, the sensor sequentially emits various detection rays with different physical penetration depths—violet, blue, green, red, and infrared—towards the plate surface. After penetrating the surface coating, these multi-band rays strike the exposed aluminum substrate and undergo diffuse reflection. Based on the principle of optical absorption, thicker micro-regions of the coating absorb more light energy, resulting in a significant attenuation of the light signal reflected back to the sensor from the aluminum substrate; conversely, thinner areas transmit stronger reflected light signals. The multispectral image sensor accurately captures these reflected rays modulated by the coating thickness and converts their intensity into a computer-resolvable digital signal. By scanning and collecting the reflection values ​​across the entire physical plate, the industrial control computer constructs a detailed digital multispectral matrix in memory. This matrix is ​​not only a two-dimensional coordinate graph, but also a three-dimensional thickness distribution topographic map that fully characterizes the microscopic undulations of the coating on the surface of the current untreated plate.

[0044] S2. The industrial control computer uses the mechanical coordinate system of the exposure roller as a reference to spatially map the pixel dot matrix image data with the digital multispectral matrix and establish a comprehensive data array containing image information and initial coating thickness information.

[0045] S2 specifically includes:

[0046] The industrial control computer sets the rotation starting point of the exposure roller and the axial starting point of the laser head as a unified reference. Based on the reference, the industrial control computer initiates spatial mapping and introduces multi-dimensional physical deformation compensation parameters during the mapping process. The intermediate offset coordinate is obtained by multiplying the distance of the digital image reference coordinate by the thermodynamic scaling ratio caused by temperature changes. The surface tension deformation increment caused by the stretching of the roller fixture is superimposed on the intermediate offset coordinate to calculate the actual physical coordinate distance of the pixel on the surface of the untreated plate that has undergone physical deformation. This corrects the spatial size deviation of the untreated plate caused by the combined effects of environmental factors and mechanical stress. When the pixel density of the pixel array image data does not match the grid of the digital multispectral matrix, the average value of the surrounding adjacent thickness grid is extracted for filling and matching. Finally, a comprehensive data array is established.

[0047] After acquiring a thickness topographic map reflecting the true physical state of the printing plate, the core challenge of the system lies in how to precisely align the ideal digital image coordinates within the computer with the coordinates of the physical printing plate, which may exhibit slight deformations in reality. To this end, the industrial control computer abandons the external visual camera alignment method, which is easily affected by surface reflections, and directly requests the absolute coordinate origin from the underlying mechanical hardware: the system defines the zero-degree rotation position of the exposure roller servo motor as the circumferential zero point, and the edge limit position of the laser head on the sliding track as the axial zero point. The intersection of these two forms an immovable physical spatial reference, based on which the system initiates a spatial mapping algorithm.

[0048] However, aluminum is extremely sensitive to ambient temperature, and the plate-making process involves forcibly rolling the originally flat plate and using clamps to stretch and fix it to the surface of a cylindrical roller. This process inevitably produces mechanical stress deformation due to thermal expansion and contraction, as well as surface tension. Therefore, the industrial control computer synchronously introduces multi-dimensional physical deformation compensation parameters during the mapping process. Through real-time algorithms, it performs microscopic distortion and stretching compensation on the coordinate grid of the digital image, offsetting the dimensional deviations caused by the aforementioned environmental and physical factors.

[0049] To address the dimensional deviations caused by the aforementioned environmental and physical factors, the industrial control computer employs a multi-dimensional physical deformation compensation formula to perform microscopic stretching and twisting calculations on the mapping reference coordinates of the digital image. This compensation formula is expressed as:

[0050]

[0051] In the formula,

[0052] : Indicates the actual physical coordinate distance of the target pixel on the surface of the plate that has undergone physical deformation after compensation calculation;

[0053] : Represents the distance to the digital image reference coordinates set within the system based on an ideal state;

[0054] : Indicates the linear thermal expansion coefficient of the aluminum base metal of the untreated plate material;

[0055] : Indicates the real-time ambient temperature of the device as collected by the environmental sensor;

[0056] : Indicates the preset standard calibration temperature of the equipment;

[0057] : Indicates the mechanical stress deformation coefficient of this batch of untreated printing plates;

[0058] : Indicates the surface tension generated when the plate is fixed to the exposure cylinder and stretched by the end clamps.

[0059] To calculate the actual coordinates of the target pixel, the system first performs thermodynamic calculations: extracting the inherent thermal expansion coefficient of the aluminum substrate. And obtain the real-time ambient temperature of the current workshop. With standard calibration temperature Temperature difference between Multiplying this temperature difference by the coefficient of thermal expansion yields the basic scaling value caused solely by thermal expansion and contraction. Subsequently, the system incorporates mechanical calculations: obtaining the tensile surface tension applied by the fixture when the plate is encased in the exposure cylinder. In conjunction with the mechanical stress deformation coefficient of the printing plate The actual distance increment caused by surface tension deformation was derived.

[0060] The industrial control computer first sets the ideal coordinate distance Multiplying by the thermodynamic scaling factor yields the intermediate offset coordinates affected by temperature. Then, this intermediate coordinate is directly superimposed with the mechanical stress tensile increment. Through this multi-dimensional superposition calculation, the system can accurately calculate the actual coordinate position of each pixel in the digital image on the physically deformed physical plate, thereby ensuring that the subsequently generated composite data array is accurately aligned in spatial mapping.

[0061] During point-to-point array mapping, if the pixel resolution of the digital image is extremely high while the resolution of the multispectral scanning grid is relatively low, causing a mismatch between their coordinates, the system automatically extracts the values ​​of multiple adjacent thickness grids around the blank area and performs smooth interpolation by calculating a weighted average to fill the gap, ensuring data continuity. Through this precise coordinate correction and data fusion, the industrial control computer establishes a multi-dimensional comprehensive data array. This array completely breaks down the boundaries between digital and physical data, ensuring that each pixel containing image depth information is accurately bound to the initial coating thickness value of its corresponding position on the physical plate.

[0062] S3. The industrial control computer reads the integrated data array to perform a processing-free exposure simulation. Based on the local coating thickness, it simulates the physical phase transition defects under standard laser energy and generates an energy deviation map covering the entire plate.

[0063] S3 specifically includes:

[0064] The industrial control computer pre-sets a standard laser energy with aging compensation parameters and executes the following judgment logic during the no-processing exposure simulation: if the initial coating thickness value read from the integrated data array is greater than the set threshold, it is determined that the standard laser energy cannot penetrate the coating, causing the underlying adhesion failure and resulting in a physical phase transition defect of blurry image; if the initial coating thickness value read from the integrated data array is less than the set threshold, it is determined that the standard laser energy is excessive, causing the substrate to burn through and resulting in a physical phase transition defect of printing dirt.

[0065] Based on the attenuation characteristics of optical media, the industrial control computer combines the difference between the initial coating thickness and the system's preset coating standard reference thickness with the energy attenuation absorption constant as an exponential term. According to the nonlinear exponential attenuation law, it calculates the compensating heat that causes the thick coating to undergo a complete phase change and the deducting heat that prevents the ablation of the underlying aluminum substrate. The compensating heat and deducting heat are then used as energy increase and decrease values ​​and stitched together to generate an energy deviation map.

[0066] Before officially commencing laser engraving, the industrial control computer needs to perform exposure state data simulation calculations internally without consuming any physical materials. Given that the luminous efficiency of the laser generator undergoes irreversible physical decay with increasing usage years, the system pre-reads the laser's cumulative operating time and retrieves its factory-set optical power attenuation coefficient curve to calibrate a current standard laser energy value capable of dynamically compensating for optical decay. Subsequently, the computer reads the comprehensive data array line by line and executes defect prediction logic: based on the conditional triggering rules set internally by the computer, it compares the initial coating thickness value recorded at each coordinate point in the array with the preset upper and lower safety thresholds.

[0067] The core imaging mechanism of the pre-processed printing plate is as follows: after the surface coating absorbs a specific threshold of laser thermal energy, it undergoes a physical phase transition and firmly cross-links with the underlying aluminum oxide layer. When the computer detects that the initial thickness of the coating in a certain coordinate area is too large and exceeds the set safety upper limit threshold, the system determines that if only standard laser energy is used for radiation, the limited thermal energy will be excessively consumed during the downward conduction of the thick coating, resulting in the bottom coating not reaching the phase transition activation temperature. This will cause a physical phase transition defect due to insufficient cross-linking adhesion between the coating and the aluminum substrate. During subsequent water-cooled printing, the image dots in this area will easily detach and become blurry. Conversely, when the system detects that the coating thickness in a certain area is abnormally thin and below the lower limit threshold, it determines that the standard laser energy is severely excessive in this area. The excess extremely high thermal energy will directly penetrate the coating, excessively ablate the underlying hydrophilic aluminum oxide protective layer, and damage its physical structure, causing abnormal ink adsorption in this area during printing, resulting in a physical defect of background graying and dirt.

[0068] In response to the two-way risks simulated by the above data, the industrial control computer accurately calculates the amount of compensating heat required to induce a complete bottom phase change in the thick coating, and the amount of deducting heat required to prevent excessive ablation of the bottom of the thin coating, based on the energy attenuation law of heat transfer from top to bottom in the plate coating medium (i.e., the physical relationship that laser thermal energy decreases proportionally with the increase of penetration depth).

[0069] To accurately quantify the compensation and deduction values ​​based on the energy decay law, the industrial control computer uses an exponential energy decay derivation formula to perform data simulation calculations of the phase transition state. This formula is expressed as:

[0070]

[0071] In the formula,

[0072] : Represents the calculated value of laser energy deviation derived from the system simulation, which requires compensation or deduction for specific coordinate points;

[0073] This indicates the current standard laser energy pre-calibrated by the industrial control computer and including aging compensation.

[0074] : Represents the base of the natural logarithm (a mathematical constant);

[0075] : Represents the energy attenuation absorption constant of the laser in the untreated plate coating medium of the laser emission band;

[0076] : Represents the actual coating thickness value recorded at this coordinate point in the digital multispectral matrix;

[0077] : Indicates the system's preset standard coating thickness.

[0078] The system is based on the attenuation characteristics of the optical medium: introducing a natural constant. An exponential model with base 1 is used to extract the energy attenuation absorption constant of the current preset probe light band in the untreated coating medium. The system will use multispectral scanning to determine the actual coating thickness at that coordinate point. Compared to the standard coating thickness under ideal conditions Subtraction yields the physical tolerance of the coating. .

[0079] The system combines the thickness difference with the energy attenuation absorption constant. Multiplication, as a natural constant The exponent. Since the energy consumption of laser light as it passes through a medium is not linear but exhibits exponential decay, this formula objectively reflects the attenuation law of laser thermal energy in the coating medium. When the actual thickness Greater than standard thickness When the result of the exponent term is greater than 1, the final calculated result is... If the value is positive, the system uses this as the additional heat required to induce a complete phase transition in the thick coating; when the actual thickness... Less than standard thickness When the result of the exponent term is less than 1, the final calculated result is... The value is negative, and the system uses this as the amount of heat to be deducted to prevent excessive ablation of the underlying aluminum substrate. Through this formula, the computer completes the quantitative conversion from coating thickness differences to energy compensation parameters. The system records these energy increase / decrease values ​​in an array, and finally stitches them together to generate an energy deviation map.

[0080] S4. The industrial control computer generates dynamic exposure control instructions based on the energy deviation diagram, and dynamically adjusts the laser exposure energy for pixel areas of different thicknesses during the high-speed rotation of the exposure roller in the plate-making process.

[0081] The specific steps in S4 for generating dynamic exposure control commands based on the energy deviation map include:

[0082] The industrial control computer extracts the rotational speed of the exposure roller during its stable operation and the physical speed of the laser head moving along the sliding track. Combining the real-time position signal fed back by the hardware encoder with the fixed time delay difference of the electrical signal transmission, the theoretical waiting time is obtained by dividing the physical angular distance between the coordinates of the pixel area to be adjusted extracted from the energy deviation map and the current physical position of the laser head by the rotational speed. Then, the fixed time difference of the combined delay of the electrical signal transmission and the current response is directly subtracted from the theoretical waiting time to obtain the absolute trigger moment after advance compensation. This trigger moment is used as the time-axis-based trigger moment, and the trigger moment is bound to the corresponding energy adjustment value to generate a strictly time-ordered sequence of trigger moments as a dynamic exposure control command.

[0083] Step S4, which involves dynamically adjusting the laser exposure energy for pixel regions of different thicknesses, specifically includes:

[0084] The industrial control computer executes dynamic exposure control commands based on the current response delay parameters of the laser drive circuit board: when the triggering time of the corresponding thicker coating area is reached, a control signal is output to extend the pulse emission time of the laser light-emitting tube; when the triggering time of the corresponding thinner coating area is reached, a control signal is output to reduce the output power of the laser light-emitting tube; and when the laser head sweeps across the normal coating thickness area, the laser light-emitting tube is controlled to immediately return to the preset standard laser energy.

[0085] After the initial simulation calculations are completed, the exposure roller enters a stable operation phase at its highest speed, and the plate-making process proceeds to the final dynamic exposure stage. Since the high-speed underlying driver hardware cannot directly analyze a two-dimensional spatial coordinate array, the industrial control computer performs a dimensional conversion from spatial to temporal scales. The system extracts the stable angular velocity of the roller and the axial translational linear velocity of the laser head in real time, while simultaneously integrating the absolute position signal fed back from the hardware encoder. To eliminate the inherent electronic transmission delay between the motherboard and the laser driver circuit board, the system compensates for this time delay by fixing the difference, thereby accurately converting the spatial coordinates on the energy deviation map into the trigger moment on the time axis.

[0086] To achieve dynamic control closed loop under high-speed operation, the industrial control computer uses a forward compensation kinematic formula to perform dimensional transformation calculations. This formula is expressed as:

[0087]

[0088] In the formula,

[0089] : Indicates the absolute trigger moment when the industrial control computer sends dynamic exposure control commands to the underlying hardware;

[0090] : Represents the physical angular distance between the coordinates of the pixel region to be adjusted extracted from the energy deviation map and the current physical position of the laser head;

[0091] : Indicates the actual angular velocity of the exposure roller during its stable operation phase;

[0092] : Represents the total fixed difference in system delay (which includes the electrical signal transmission time from the motherboard to the driver board, and the sum of the current response time of the field-effect transistors on the driver board).

[0093] During the conversion process, the system first performs a basic time calculation based on the principles of circular kinematics: obtaining the angular velocity of the exposure roller during its stable operation phase. Simultaneously, abnormal target points with energy adjustment values ​​are extracted from the energy deviation map, and the physical angular distance to be rotated between the target point and the current physical spatial position of the laser head is calculated. Physical angular distance Divide by angular velocity This allows us to determine the theoretical waiting time required for the laser head to scan the target point.

[0094] However, in practical high-speed closed-loop control, the inherent hysteresis of the electronic system must be considered. Therefore, the system extracts a comprehensive delay fixed difference, including the electrical signal transmission time from the motherboard to the driver board and the current response time of the field-effect transistors. In the final step of the overall calculation, the industrial control computer directly subtracts this fixed difference in overall delay from the theoretical waiting time. Through this subtraction operation, the system executes a hardware control-level advance compensation mechanism to ensure that control signals are sent in advance. At the instant the signal passes through the complex circuit board and is finally converted into a change in the intensity of the laser light source, the laser head precisely sweeps across the corresponding target pixel area in physical space, achieving accurate synchronization between the digital time series and the physical spatial motion.

[0095] The system binds the calculated trigger time with the corresponding energy increase / decrease values, generating dynamic exposure control commands strictly arranged in chronological order. During the high-speed relative motion between the laser head and the plate surface, the industrial control computer, combined with the delay parameters of the circuit board response current, sends drive signals in real time. When the time axis advances to the trigger time in the area with a thicker coating, the system outputs a pulse control signal to extend the duty cycle of the laser emitter's single pulse emission, transferring more heat energy to the bottom of the coating. When it advances to the trigger time in the area with a thinner coating, the system outputs a power adjustment signal to reduce the output current of the laser emitter to radiate a lower-intensity laser beam, protecting the underlying layer from thermal damage. When it crosses the abnormal area and enters the normal thickness range, the system controls the laser emitter to immediately return to the standard laser energy state. Through the above millisecond-level closed-loop control, this method effectively eliminates image defects induced by the physical tolerances of the coating on unprocessed plates, achieving stable high-fidelity plate making.

[0096] Example 2

[0097] Reference Figure 4 This is the second embodiment of the present invention, which provides a process optimization method for CTP plate-making without processing based on multispectral spatial mapping simulation. Building upon Embodiment 1, this embodiment further introduces an adaptive dynamic adjustment strategy for multiple working conditions. Addressing the mutually exclusive extreme physical printing requirements in actual industrial production (such as extreme dot detail, extremely high mechanical durability, and large-area visual smoothness), this embodiment establishes a unified parameter analysis entry point and threshold defense line, intelligently triggering parallel processing branches to meet high-standard plate-making tasks under different working conditions. Specifically, it includes:

[0098] Before executing dynamic exposure control commands, the industrial control computer also performs the following operations:

[0099] The operating parameters of the target printing task are extracted from the prepress operation management system. Based on the operating parameters, the industrial control computer sets a maximum limit threshold for extending the pulse emission time of the laser light-emitting tube to prevent the heat from spreading laterally and causing abnormal dot expansion due to unlimited extension of the emission time. At the same time, a minimum limit threshold is set for reducing the output power of the laser light-emitting tube to prevent the laser thermal energy from failing to reach the minimum activation temperature required for the physical phase change of the coating due to excessive reduction of power.

[0100] In practice, a single standard dynamic exposure control cannot meet the extremely complex and ever-changing application needs of the printing industry. Therefore, before the industrial control computer ultimately sends dynamic exposure control commands to the underlying hardware, a unified adaptive operating condition interception and analysis module is added. The system first communicates with an external prepress management system (such as an enterprise resource planning system or plate-making software) to analyze and extract comprehensive operating condition parameters of the current target printing task (including but not limited to screen ruling, substrate material, and estimated print quantity). Based on these objective operating condition parameters, the system establishes two physical defenses in its underlying logic: the first defense is a maximum limiting threshold (for example, setting the upper limit of a single pulse emission time to within 120% to 125% of the standard emission time), used to constrain the upper limit of laser emission time. Because of the thermal diffusion effect during laser propagation within the coating, if the irradiation time is extended without limit to compensate for the thick coating, the excess heat will spread laterally, causing the image pixels to expand abnormally and coarsen on the physical plate, thus destroying image detail. The second line of defense is a minimum threshold (e.g., setting the lower limit of laser output power to 75% to 80% of the standard output power) to constrain the lower limit of laser power. If the laser power is excessively reduced to protect the thin coating, the laser heat energy will not be able to cross the minimum activation temperature required for the physical phase transition of the coating material, resulting in plate-making failure. By establishing the above basic constraint boundaries, the system can safely and reliably adaptively adjust in subsequent application branches.

[0101] If the image detail resolution in the operating parameters is greater than the preset high-precision threshold, the industrial control computer derives a dynamic amplification multiplier based on the proportion of the image detail resolution exceeding the high-precision threshold and the thermal diffusion compensation coefficient. The preset basic maximum limit threshold is multiplied by the dynamic amplification multiplier to dynamically increase the maximum limit threshold, and a pulse control signal is output that reaches the increased maximum limit threshold. By compensating for the heat lost by the pixel to the surroundings, the physical phase change bonding force of the coating corresponding to the pixel is improved, ensuring the fidelity of image detail reproduction.

[0102] Furthermore, for tasks requiring stringent dot reproduction, such as high-resolution commercial brochures, the first high-resolution processing branch is triggered when the system detects that the image detail resolution in the operating parameters exceeds a preset high-resolution threshold (e.g., determining that the current screen ruling is greater than or equal to 250 lpi and the highlight area contains 1% to 3% extremely small frequency-modulated dots). Under these physical conditions, the image contains a large number of tiny pixels. From a thermodynamic perspective, tiny pixels have a small heat capacity. When they happen to be located in areas with a thicker coating on the printing plate, the heat generated by laser irradiation is easily dissipated rapidly to the surrounding unexposed, cool areas, resulting in the phase transition temperature at the bottom of the dots not meeting the standard. To solve this problem, the industrial control computer actively increases the aforementioned maximum limit threshold (e.g., increasing the upper limit of the pulse emission time from 125% of the standard time to 140%), allowing the underlying hardware to output pulse control signals with a longer duty cycle that reach the new threshold after the increase.

[0103] Industrial control computers do not use a fixed value for upward adjustment, but rather dynamically calculate the maximum limit threshold after adjustment using a resolution-based thermal diffusion compensation formula, which is expressed as:

[0104]

[0105] In the formula:

[0106] : Indicates the calculated maximum limit threshold after adjustment (i.e., the dynamic upper limit of the single pulse emission time).

[0107] : Indicates the maximum threshold value pre-set by the system based on standard operating conditions;

[0108] : Represents the thermal diffusion compensation coefficient (its value depends on the physical thermal conductivity of the coating material of this batch of untreated plates);

[0109] : Indicates the actual image detail resolution of the target printing task currently extracted;

[0110] : Indicates the system's preset high-precision threshold (under this triggering condition, ).

[0111] Industrial control computers first determine the current actual image detail resolution. With preset high precision threshold A division operation is performed, and 1 is subtracted to obtain the percentage of resolution exceeding the threshold. This percentage is then divided by the thermal diffusion compensation coefficient. Multiply the results, add 1 to the result, and use it as the dynamic amplification multiplier. Finally, set the base maximum threshold. Multiplying this by the dynamic amplification multiplier yields the final upscaled value. This calculation logic objectively reflects the laws of heat conduction: the higher the image resolution (i.e., the smaller the volume of tiny pixels), the faster the heat dissipates to the surrounding unexposed areas. Based on this, the system calculates the upper limit of the pulse emission time, which is positively correlated with the image resolution, and realizes the quantitative adjustment of energy dissipation of tiny pixels.

[0112] Through this compensation strategy, the system continuously conducts compensating heat energy to the bottom of the coating, effectively counteracting the heat loss effect of tiny dots and promoting the complete cross-linking of the macromolecular chains in the underlying coating corresponding to the fine pixels. This branching strategy, at the cost of sacrificing extremely slight local background gray, significantly improves the phase transition bonding force of tiny pixels on the physical substrate, thereby ensuring high-fidelity reproduction of highlight areas and fine texture features in the image.

[0113] If the estimated total print volume in the operating parameters is greater than the preset print durability threshold, the industrial control computer raises the minimum limit threshold. When it determines that there is a thin coating area in the comprehensive data array, it outputs a control signal according to the raised minimum limit threshold. By maintaining the preset heat energy, the molecules inside the coating are deeply cross-linked and hardened to form a film, thereby improving the overall print durability of the untreated plate.

[0114] In another scenario, for tasks such as high-speed newspaper printing or ultra-long single-print packages, when the system analyzes the estimated total print run in the operating parameters to be greater than the preset print durability threshold (e.g., determining that the target continuous printing times for a single printing plate exceed 100,000 prints), a second high print durability processing branch is triggered. In such printing operations, the untreated printing plate, while running on the printing press, must withstand the chemical erosion of the weakly acidic dampening solution and the high-speed physical compression and friction of the blanket cylinder for an extended period. If there are areas with thin coatings on the plate surface, conventional control logic would significantly reduce the laser power to prevent burning through the substrate. However, this would result in insufficient cross-linking and hardening of the thin coating area, making it highly susceptible to wear and detachment during long-term printing. Therefore, the industrial control computer proactively increases the aforementioned minimum threshold (e.g., tightening the lower limit of laser output power from 75% to 85% of the standard power). Even if the system determines that there are areas with abnormally thin coatings in the integrated data array, it directly drives the underlying hardware to output a control signal with a power no lower than this newly set minimum threshold. By maintaining a relatively ample amount of pre-set heat energy, the system ensures that the photosensitive polymer material in the thin coating area can undergo deep network cross-linking and a robust hardened film. This branch strategy effectively resists abrasion factors in harsh printing environments by strengthening the structural strength of weak physical areas, significantly improving the overall print durability of treatment-free plates.

[0115] If the area of ​​contiguous areas of the same image depth information in the operating parameters is greater than the preset real-world threshold, the industrial control computer extracts the energy difference between the two sides of the spatial boundary between the thicker and thinner coating areas, and generates multiple virtual transition pixels at the spatial boundary. Based on the steady-state energy value of the starting side at the spatial boundary, the energy difference is discretized and distributed according to the spatial sequence position of each virtual transition pixel at the spatial boundary, and the virtual transition pixels are given a smooth and gradual transition energy value. Based on the transition pixels, the dynamic exposure control command is modified so that the adjusted laser exposure energy presents a stable state of linear increase and linear decrease on the transition pixels, eliminating the visual stripe defect caused by the instantaneous step jump in energy in the area of ​​contiguous areas of the same image depth information.

[0116] In particular, for tasks such as solid color background textures commonly encountered in packaging printing, when the system detects that the area of ​​continuous areas with the same image depth information (i.e., solid halftone areas) in the working parameters exceeds a preset solid threshold, a third visual smoothing processing branch is triggered. Based on the physiological characteristics of human vision, the human eye is extremely sensitive to minute abrupt changes within large areas of uniform color blocks. If the physical plate happens to have a clear boundary between thick and thin coatings within this large area, conventional control commands will cause a sudden change in laser energy at this boundary, resulting in visual stripe defects on the printed surface parallel to the roller axis. To eliminate this phenomenon, the industrial control computer automatically identifies and extracts the laser energy difference on both sides of the boundary between thick and thin coatings when generating dynamic exposure control commands. The system uses a data interpolation algorithm to artificially generate multiple virtual transition pixels in the boundary area that do not exist in the original digital image.

[0117] To ensure that the adjusted laser exposure energy remains stable at the interface, the industrial control computer uses a one-dimensional linear interpolation formula to assign energy values ​​to the virtual transition pixels. This formula is expressed as:

[0118]

[0119] In the formula,

[0120] : indicates the number calculated by the system Each virtual transition pixel is assigned a dynamic laser exposure energy value;

[0121] : This represents the steady-state laser exposure energy adjustment reference value on the left side of the spatial boundary (e.g., in areas where the coating is thinner);

[0122] : Indicates the steady-state laser exposure energy adjustment reference value on the right side of the spatial boundary (e.g., in areas with thicker coatings);

[0123] : Indicates the total number of virtual transition pixels generated within the spatial boundary region;

[0124] : Represents the spatial sequence index of the currently calculated virtual transition pixel (value is a positive integer, and...). ).

[0125] When performing energy reconstruction calculations, the industrial control computer first extracts the energy difference between the two sides of the boundary. And divide the energy difference by This allows the system to calculate the unit gradient step size for energy increase or decrease between two adjacent virtual pixels. Subsequently, the system uses the spatial sequence index of each virtual transition pixel within the boundary interval... The unit gradual step size is related to the index. Multiply by the product to obtain the cumulative energy change at that location, and then add it to the steady-state energy value at the starting side. Above. Through the discretized interpolation calculations performed on each virtual transition pixel, the system distributes the originally huge instantaneous energy drop evenly and smoothly to each micro node in the boundary region, thereby achieving a linear gradient output with a constant slope at the physical exposure level.

[0126] Based on these virtual transition pixels, the system reconstructs and modifies the dynamic exposure control commands on the time axis, so that when the laser crosses the thickness boundary region, its exposure energy no longer exhibits a precipitous jump, but rather a smooth, gradual change with a controllable linear increase or decrease, relying on the transition pixels. This branch strategy cleverly integrates digital image processing and continuous laser power modulation technology, effectively eliminating stripe defects caused by microscopic energy abrupt changes at the macroscopic level of visual optics, and ensuring color uniformity in large-area solid printing.

[0127] In summary, by using a mechanical coordinate system as a unified benchmark, spatially mapping pixel-based images to a multispectral thickness matrix, and introducing multidimensional physical deformation compensation, precise alignment between digital images and physical entity features is achieved. Building upon this, the invention employs data simulation calculations to pre-predict physical phase transition defects and converts energy deviations into a time-triggered sequence for advance compensation to dynamically adjust laser energy. This changes the traditional blind printing mode with constant energy exposure, effectively avoiding dot loss, blurring, or ablation caused by coating tolerances, and significantly improving the stability of image reproduction quality. Furthermore, by extracting specific operating parameters and executing adaptive processing branches, and utilizing dynamic threshold constraints and virtual pixel interpolation allocation, the invention objectively ensures consistent plate-making quality across various operating scenarios, including high-precision detail reproduction, high printing durability maintenance, and large-area solid smooth printing.

[0128] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation, characterized in that, Performed by a computer device, including the following steps: S1. The industrial control computer acquires pixel dot matrix image data; the industrial control computer drives the exposure roller to rotate at a low speed and controls the multispectral image sensor to scan the unprocessed plate and generate a digital multispectral matrix reflecting the initial thickness distribution of the coating. S2. The industrial control computer uses the mechanical coordinate system of the exposure roller as a reference to spatially map the pixel dot matrix image data with the digital multispectral matrix to establish a comprehensive data array containing image information and initial coating thickness information. S3. The industrial control computer reads the integrated data array to perform a processing-free exposure simulation, simulates physical phase transition defects under standard laser energy based on the local coating thickness, and generates an energy deviation map covering the entire plate. S4. The industrial control computer generates dynamic exposure control instructions based on the energy deviation diagram, and dynamically adjusts the laser exposure energy for pixel areas of different thicknesses during the high-speed rotation of the exposure roller in the plate-making process.

2. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 1, characterized in that, S1 specifically includes: The industrial control computer controls the multispectral image sensor to sequentially emit detection light of various different wavelengths; the detection light penetrates the surface coating of the untreated plate and is reflected in the exposed aluminum metal substrate; the multispectral image sensor receives the reflected light and converts the intensity of the reflected light into a digital signal, and then generates a digital multispectral matrix based on the physical correspondence that the thicker the coating, the weaker the reflected light.

3. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 1, characterized in that, S2 specifically includes: The industrial control computer sets the rotation starting point of the exposure roller and the axial starting point of the laser head as a unified reference. Based on the reference, the industrial control computer initiates spatial mapping and introduces multi-dimensional physical deformation compensation parameters during the mapping process. It multiplies the digital image reference coordinate distance with the thermodynamic scaling ratio caused by temperature changes to obtain the intermediate offset coordinates. The surface tension deformation increment caused by the roller clamp stretching is superimposed on the intermediate offset coordinates to calculate the actual physical coordinate distance of the pixel on the surface of the untreated plate that has undergone physical deformation. This corrects the spatial size deviation of the untreated plate caused by the combined influence of environmental factors and mechanical stress. When the pixel density of the pixel array image data does not match the grid of the digital multispectral matrix, the average value of the surrounding adjacent thickness grids is extracted for filling and matching, and finally a comprehensive data array is established.

4. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 1, characterized in that, S3 specifically includes: The industrial control computer pre-sets a standard laser energy with aging compensation parameters and executes the following judgment logic during the processing-free exposure simulation: if the initial coating thickness value read in the integrated data array is greater than a set threshold, it is determined that the standard laser energy cannot penetrate the coating, causing the underlying adhesion failure and resulting in a physical phase transition defect of blurred image; if the initial coating thickness value read in the integrated data array is less than the set threshold, it is determined that the standard laser energy is excessive, causing the substrate to burn through and resulting in a physical phase transition defect of printing dirt. Based on the attenuation characteristics of the optical medium, the industrial control computer combines the difference between the initial coating thickness and the system's preset coating standard reference thickness with the energy attenuation absorption constant as an exponential term. According to the nonlinear exponential attenuation law, it calculates the compensating heat that causes the thick coating to undergo a complete phase change and the deducting heat that prevents the ablation of the underlying aluminum substrate. The compensating heat and deducting heat are then used as energy increase or decrease values ​​and stitched together to generate an energy deviation map.

5. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 1, characterized in that, The step of generating dynamic exposure control instructions based on the energy deviation map in S4 specifically includes: The industrial control computer extracts the rotational speed of the exposure roller during its stable operation and the physical speed of the laser head moving along the sliding track. Combining the real-time position signal fed back by the hardware encoder with the fixed time delay difference of the electrical signal transmission, the theoretical waiting time is obtained by dividing the physical angular distance between the coordinates of the pixel area to be adjusted extracted from the energy deviation map and the current physical position of the laser head by the rotational speed. Then, the fixed time difference of the combined delay of the electrical signal transmission and the current response is directly subtracted from the theoretical waiting time to obtain the absolute trigger moment after advance compensation. This trigger moment is used as the time-axis-based trigger moment, and the trigger moment is bound to the corresponding energy adjustment value to generate a strictly time-ordered sequence of trigger moments as a dynamic exposure control command.

6. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 5, characterized in that, The step S4, which involves dynamically adjusting the laser exposure energy for pixel regions of different thicknesses, specifically includes: The industrial control computer executes the dynamic exposure control command in conjunction with the current response delay parameter of the laser drive circuit board: when the trigger moment of the corresponding thicker coating area is reached, a control signal is output to extend the pulse emission time of the laser light-emitting tube; when the trigger moment of the corresponding thinner coating area is reached, a control signal is output to reduce the output power of the laser light-emitting tube; and when the laser head sweeps across the normal coating thickness area, the laser light-emitting tube is controlled to immediately restore to the preset standard laser energy.

7. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 6, characterized in that, Before executing the dynamic exposure control command, the industrial control computer also performs the following operations: The operating parameters of the target printing task are parsed and extracted from the prepress operation management system. Based on the operating parameters, the industrial control computer sets a maximum limit threshold for the pulse emission time of the extended laser light-emitting tube to prevent the heat from spreading laterally and causing abnormal dot expansion due to unlimited extension of the emission time. At the same time, a minimum limit threshold is set for reducing the output power of the laser light-emitting tube to prevent the laser thermal energy from failing to reach the minimum activation temperature required for the physical phase change of the coating due to excessive reduction of power.

8. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 7, characterized in that, If the image detail resolution in the operating parameters is greater than the preset high-precision threshold, the industrial control computer derives a dynamic amplification multiplier based on the proportion by which the image detail resolution exceeds the high-precision threshold and the thermal diffusion compensation coefficient. The preset basic maximum limit threshold is multiplied by the dynamic amplification multiplier to dynamically increase the maximum limit threshold, and a pulse control signal that reaches the increased maximum limit threshold is output. By compensating for the heat lost by the pixel to the surroundings, the physical phase change bonding force of the coating corresponding to the pixel is improved, ensuring the fidelity of image detail reproduction.

9. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 7, characterized in that, If the estimated total print volume in the operating parameters is greater than the preset print durability threshold, the industrial control computer raises the minimum limit threshold. When it is determined that there is a thin coating area in the integrated data array, it outputs a control signal according to the raised minimum limit threshold. By maintaining the preset heat energy, the molecules inside the coating are deeply cross-linked and hardened to form a film, thereby improving the overall print durability of the untreated plate.

10. The method for optimizing the CTP plate-making process without processing based on multispectral spatial mapping simulation according to claim 7, characterized in that, If the area of ​​contiguous areas of the same image depth information in the operating parameters is greater than a preset real-world threshold, the industrial control computer extracts the energy difference between the two sides of the spatial boundary between the thicker and thinner coating areas, and generates multiple virtual transition pixels at the spatial boundary. Based on the steady-state energy value of the starting side of the spatial boundary, and according to the spatial sequence position of each virtual transition pixel at the spatial boundary, the energy difference is discretized and distributed in a step ratio, giving the virtual transition pixels a smooth and gradual transition energy value. Based on the transition pixels, the dynamic exposure control command is modified so that the adjusted laser exposure energy presents a stable state of linear increase and linear decrease on the transition pixels, eliminating the visual stripe defect caused by the instantaneous step jump in energy in the area of ​​contiguous areas of the same image depth information.

Images