TWI814431B - Method and system for automatic detection and compensation of gray scale value in real time - Google Patents

Abstract

The present invention relates to a method and system for automatic detection and compensation of gray scale value in real time. The method includes: constructing a relation curve between a rotation angle and gray scale value, wherein the rotation angle corresponds to an incident laser energy at a marked point; acquiring an image from the marked point while a laser marking process is being performed, and then obtaining an actual gray scale value of the marked point based on the acquired image; determining the required rotation angle according to the relation curve when the actual gray scale value of the marked point exceeds a predetermined range, and adjusting the rotation angle tc match the incident laser energy at the marked point with the actual gray scale value. The present invention establishes a parameter variation which is controllable and has functional relationship with the gray scale value by constructing the relation curve between the rotation angle and gray scale value, and accordingly controls the actual gray scale value to keep it in a standard range by changing a value of the parameter variation, thereby avoiding the problem that a large number of products might be scrapped due to the change of the gray scale value.

Description

Method and system for automatic real-time grayscale value detection and compensation

The present invention relates to the technical field of laser marking and detection, and in particular to a method and system for automatic real-time grayscale value detection and compensation.

With the development of science and technology, laser marking machines have become a common equipment in engraving and marking processing. They use laser beams to focus and burn on the surface of the workpiece to achieve marking processing. They are popular because of their fast speed and high precision. Favored by the industry. However, during the process of automatic processing, due to laser power attenuation, component aging and other uncontrollable factors, the gray value of the marked point changes. If this change is not discovered or dealt with in time, it will easily lead to batch scrapping of product processing, seriously affecting the Production and processing efficiency and product yield.

After searching, Japanese patent publication number JP5589318B2 disclosed a laser marking method on September 17, 2014. This method changes the peak power of pulse light by changing the pulse duration, and then changes the processing speed without changing the The grayscale of the marker pattern. The European patent publication number EP3088200B1 disclosed a laser marking method on November 3, 2021. This method calculates the output power of the marking point based on the gray value of the marking point, and outputs the laser with the calculated output power. The Chinese patent with publication number CN112872603A disclosed a method for preparing a shell on June 1, 2021. This method sets the laser energy for laser engraving through the gray value of the target pattern, and performs laser engraving based on the set laser energy. Shot engraving processing. It can be seen that the aforementioned patent only discloses that the relationship between the gray value of the marking pattern and the laser energy can be used for laser marking, such as using this relationship to change the gray value of the marking pattern, or using Use this relationship to obtain the laser marking power corresponding to the gray value, etc., which all consider the impact of the real-time gray value of the marked point on the marking effect during the laser marking process, and do not solve the problem caused by the change of the real-time gray value. The problem of batch scrapping of products.

At present, no relevant technology has been found that can be used to avoid the scrapping of large batches of products due to gray value changes in automatic processing. Therefore, it is imperative to provide a real-time gray value detection and compensation method to effectively avoid the above risks.

In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a method and system for automatic real-time grayscale value detection and compensation to solve at least one of the above-mentioned technical problems.

According to one aspect of the present invention, a method for automatic real-time grayscale value detection and compensation is provided, including: constructing a rotation angle and a grayscale value relationship curve, the rotation angle corresponding to the laser energy incident on a marker point ; Acquire an image of the marker point while laser marking, and obtain an actual grayscale value of the marker point based on the acquired image; when the actual grayscale value of the marker point exceeds the preset range, The required rotation angle is determined based on the constructed relationship curve between the rotation angle and the gray value, and the rotation angle is adjusted to match the laser energy incident on the mark point with the actual gray value.

In the above technical solution, a parameter variable that is functional and controllable with the gray value is established by constructing a relationship curve between the rotation angle and the gray value. The actual gray value of the marked point is obtained at the same time as the laser marking, and the actual gray value is When the gray value exceeds the preset range, the value of the controllable parameter variable is determined by constructing the relationship curve between the rotation angle and the gray value. By changing the value of this parameter variable, the actual gray value is controlled within the standard range, thereby solving the problem. The problem of large batches of products being scrapped due to gray value changes.

As a further technical solution, the method further includes: constructing a light polarization adjustment component on a laser marking optical path, the light polarization adjustment component having an adjustable angle, and adjusting the angle of the light polarization adjustment component When the change occurs, the intensity and direction of the light incident on the marked point through the light polarization adjustment component also change.

This technical solution uses a light polarization adjustment component on the laser marking optical path to adjust the light intensity of the outgoing laser, so that the laser energy incident on the marking point through the light polarization adjustment component changes with the change of the angle. This controllable variable realizes the adjustment of the laser energy incident on the marking point, so that the adjusted laser energy can provide the gray value of the marking point that meets the product quality requirements during marking, and avoids the gray value caused by changes in the gray value. Product obsolescence issues.

As a further technical solution, the light polarization adjustment component includes a movable polarizer and a fixed polarizer arranged sequentially along the laser marking optical path, and the movable polarizer can rotate relative to the fixed polarizer.

This technical solution uses the asymmetric principle of polarized light to change the polarization state of the light passing through the fixed polarizer by controlling the angle of the movable polarizer, so that the characteristics of the light wave incident on the surface of the product through the light polarization adjustment component change, and the light wave Changes in characteristics lead to changes in the processing effect of the beam on the product surface, that is, the gray value of the marking point changes. Therefore, by adjusting the rotation angle of the movable polarizer relative to the fixed polarizer, the gray value of the marking point can be changed. In the same way, when the gray value of the marker point changes, the rotation angle of the movable polarizer relative to the fixed polarizer can also be adjusted to compensate for the change in the gray value.

As a further technical solution, constructing the relationship curve between the rotation angle and the gray value further includes: setting a rotation starting point and a single rotation angle of the movable polarizer; rotating the movable polarizer clockwise or counterclockwise, each time the movable polarizer is rotated, Single rotation angle, record an actual value of the movable polarizer The angle and the corresponding gray value of a marker point; according to the recorded actual angles of multiple sets of the movable polarizer and the corresponding gray value of the marker point, a relationship curve between the rotation angle and the gray value is constructed.

This technical solution uses the principle that the gray value of the marker point is related to the laser energy incident on the marker point, and the change of the gray value of the marker point corresponds to the change of the laser energy incident on the marker point, and the change of the laser energy incident on the marker point is The change of the laser energy corresponds to the change of the light intensity incident on the marked point, and the change of the light intensity incident on the marked point corresponds to the change of the angle of the movable polarizer relative to the fixed polarizer. Finally, a rotation angle and The gray value relationship curve establishes a relationship between the gray value of the marker point and the controllable angle variable. By adjusting the angle variable to compensate for the change in the gray value, it can compensate for other uncontrollable factors such as laser power attenuation and component aging. Compensate for changes in gray value.

As a further technical solution, when the movable polarizer is rotated to be parallel to the polarization direction of the fixed polarizer, the intensity of the light passing through the light polarization adjusting component is maximum; when the movable polarizer is rotated to be parallel to the polarization direction of the fixed polarizer, When the polarization direction is vertical, the intensity of light passing through the light polarization adjustment component is minimum.

In this technical solution, the laser light passes through the movable polarizer and becomes polarized light in one direction (the direction of the polarized light can be changed by rotating the angle). This polarized light will then pass through the fixed polarizer, and due to the polarizer Only vibrations parallel to the polarization direction are allowed to pass through, while light vibrations perpendicular to this direction are filtered out. Therefore, when the polarization directions of the movable polarizer and the fixed polarizer are completely parallel, the light passing through the fixed polarizer reaches its strongest, while the vertical polarizer time is the minimum.

As a further technical solution, the method further includes: when the actual gray value of the marker point exceeds the preset range, calculating a difference between the actual gray value and a standard gray value, and constructing a A good relationship curve between the rotation angle and the gray value determines the required amount to compensate for the difference. The rotation angle is to rotate the movable polarizer by the rotation angle so that the laser energy incident on the mark point matches the actual gray value.

In this technical solution, a standard gray value is first determined for different equipment or products, and an acceptable preset range of gray values is determined based on the standard gray value. During the automatic processing process, the gray value of the product mark point is instantly obtained. , and calculate whether the grayscale value is within the preset range. If not, substitute the difference between the grayscale value and the standard grayscale value into the constructed rotation angle and grayscale value relationship curve to obtain the rotation angle of the movable polarizer. Angle, so that the movable polarizer performs corresponding angle rotation and changes the laser energy incident on the marked point, so that the gray value beyond the preset range can be compensated within the normal range.

According to one aspect of the present invention, a system for automatic real-time grayscale value detection and compensation is provided, including: a launch component, a marking component, an imaging component, a control component and a light polarization adjustment component, the launch component, The light polarization adjustment component and the marking component are arranged on a laser marking optical path, the imaging component is arranged on a gray value detection optical path, the emission component, the marking component, the imaging component and the light polarization adjustment component are respectively connected to the control component; the emission component is used for laser emission; the marking component is used to mark products; the imaging component is used to obtain a mark point image while marking and send it to the control component; the control component The component is used to parse an actual gray value of a marker point based on the marker point image, and when the actual gray value exceeds a preset range, determine the required value based on the constructed relationship curve between a rotation angle and a gray value. The rotation angle is adjusted and the rotation angle instruction is output to the light polarization adjustment component; the light polarization adjustment component is used to perform angular rotation according to the rotation angle instruction, so that the light polarization adjustment component that passes through the light polarization adjustment component is incident on the mark point The laser energy is adapted to this actual gray value.

In the above technical solution, the control component controls the emission component and the marking component to realize laser marking processing on the product surface, and at the same time controls the imaging component to obtain the map of the marked point while laser marking. image, and obtain the actual gray value of the marker point based on the acquired image. When the actual gray value exceeds the preset range, the rotation angle is output to the light polarization adjustment component, and the light polarization adjustment component is controlled to adjust the incident on the marker point The laser energy is used to compensate for the change in the actual gray value, so that the final marked product meets the processing quality requirements and solves the problem of large batches of products being scrapped due to changes in gray value.

As a further technical solution, the light polarization adjustment component is composed of a movable polarizer and a fixed polarizer, and the movable polarizer can rotate at a preset angle relative to the fixed polarizer. This technical solution provides a means to adjust the controllable variable of the laser energy incident on the marking point. It uses the asymmetry principle of polarized light to change the polarization state of the light wave passing through the fixed polarizer by controlling the angle of the movable polarizer, thereby changing the polarization state of the light wave passing through the fixed polarizer. The laser energy incident on the marked point achieves the purpose of changing the laser energy through the change in the rotation angle of the polarized light, and then compensates for the change in the gray value through the change in the laser energy.

As a further technical solution, the movable polarizer is connected to a driving component; the driving component is connected to the control component and is used to drive the movable polarizer to rotate at a preset angle under the control of the control component. This technical solution realizes the automatic rotation of the movable polarizer through the cooperation of the control component and the drive component. The drive component can be implemented by a stepper motor or other drive device that can drive the movable polarizer to rotate at a specific angle.

As a further technical solution, the system further includes a return component for guiding the emitted laser to the marking component and guiding the light reflected from the marking point to the imaging component. This technical solution realizes the close arrangement of emission components, marking components, imaging components and light polarization adjustment components through folding components, achieving high integration of the overall equipment and reducing the volume occupied by the equipment. Furthermore, control components can be integrated with other components or set up individually.

According to the above technical characteristics, the following effects can be achieved:

1. The present invention provides a method that establishes a parameter variable that is functional and controllable with the gray value by constructing a relationship curve between the rotation angle and the gray value, and obtains the actual gray value of the marked point while laser marking. , and when the actual gray value exceeds the preset range, the value of the controllable parameter variable is determined through the constructed relationship curve between the rotation angle and the gray value. By changing the value of this parameter variable, the actual gray value is controlled within the standard Within the range, thereby solving the problem of large batches of products being scrapped due to changes in gray value.

2. The present invention provides a system that controls the emission component and the marking component through the control component to realize laser marking processing on the product surface, and at the same time controls the imaging component to acquire the image of the marked point while laser marking, and based on the acquired The image obtains the actual gray value of the marker point. When the actual gray value exceeds the preset range, the rotation angle is output to the light polarization adjustment component, and the light polarization adjustment component is controlled to adjust the laser energy incident on the marker point. Compensate for changes in the actual gray value so that the final marked product meets processing quality requirements and solve the problem of scrapping large quantities of products due to changes in gray value.

3. The present invention utilizes the asymmetric principle of polarized light to achieve controllable adjustment of laser energy through two polarizers, and establishes a correlation between the relative rotation angle between the two polarizers and the gray value of the marker point. By changing the rotation angle, the laser energy incident on the marked point is changed, thereby compensating for the change in the gray value of the marked point, solving the problem of changes in the gray value of the marked point caused by other uncontrollable factors such as laser power attenuation and component aging. problem, and further solves the problem of scrapping large batches of products caused by changes in the gray value of marked points.

4. The present invention simultaneously detects the gray value of the marked point while laser marking, and compensates for the instant change of the gray value by establishing a controllable variable associated with the gray value, thereby realizing the gray value of the marked point during automated processing. Real-time detection and adjustment of degree values improves processing efficiency while ensuring processing quality.

1:Laser

2: Mark header

3: Imaging system

P1: Movable polarizer

P2: Fixed polarizer

S1: Step 1

S2: Step 2

S3: Step three

[The first figure] is a schematic diagram of the system used in the method of automatic real-time grayscale value detection and compensation according to the embodiment of the present invention.

[The second figure] is a flow chart of a method for automatic real-time grayscale value detection and compensation according to an embodiment of the present invention.

[The third figure] is a schematic diagram of polarized light rotation angle adjustment according to an embodiment of the present invention.

[The fourth figure] is a schematic diagram of the relationship curve between the rotation angle and the gray value according to the embodiment of the present invention.

[Figure 5] is a block diagram of a system for automatic real-time grayscale value detection and compensation according to an embodiment of the present invention.

Based on the above technical features, the main functions of the automatic real-time gray value detection and compensation method and system of the present invention will be clearly demonstrated in the following embodiments.

This embodiment provides a method for automatic real-time grayscale value detection and compensation. The method is implemented using a system that can simultaneously realize laser mark processing and grayscale value detection. Please refer to the first figure. The system includes Laser 1, marking head 2, imaging system 3 and light polarization adjustment component (not shown in the figure).

Please refer to the second figure to reveal that the method specifically includes:

Step 1 S1, gray value correlation relationship construction: construct a rotation angle and gray value (GV) relationship curve, where the rotation angle corresponds to the laser energy incident on the marker point.

Please refer to the third figure. The light polarization adjustment component is composed of a movable polarizer P1 and a fixed polarizer P2. The laser emitted by the laser 1 passes through the movable polarizer P1, the fixed polarizer P2, and the marking head 2 in sequence. Then it is incident on the product surface.

Specifically, constructing the relationship curve between rotation angle and gray value includes: setting the rotation starting point and single rotation angle of the movable polarizer P1; rotating the movable polarizer P1 clockwise or counterclockwise, and recording each single rotation angle. The actual angle of the movable polarizer P1 and the corresponding marker point gray value; based on the recorded actual angles of multiple sets of movable polarizer P1 and the corresponding marker point gray value, a relationship curve between the rotation angle and the gray value is constructed. During construction, it is assumed that the laser energy incident on the movable polarizer P1 remains unchanged, and the laser energy incident on the marked point is changed only by changing the rotation angle of the movable polarizer P1 relative to the fixed polarizer P2, and this is recorded. corresponding marker point grayscale value.

Different relationship curves between rotation angle and gray value can be constructed for different devices or products. As shown in Figure 4, the table at the bottom of the figure shows multiple sets of rotation angles and grayscale values obtained in this embodiment, and the curve at the top of the figure illustrates the changing trend of these data. When the movable polarizer P1 is rotated to be parallel to the polarization direction of the fixed polarizer P2, the intensity of the light passing through the fixed polarizer P2 is maximum; when the movable polarizer P1 is rotated to be parallel to the polarization direction of the fixed polarizer P2 When vertical, the intensity of light transmitted through the fixed polarizer P2 is minimum.

Step two S2, gray value detection: Acquire the image of the marked point while laser marking, and obtain the actual gray value of the marked point based on the acquired image. While the laser is marking, the light reflected from the marking points on the product surface reaches the imaging component, which obtains an instant image of the current marking point and sends it to the control component. The control component obtains the actual gray value of the marking point based on image recognition.

The imaging component can be arranged on the reflective light path, and the light reflected from the marking point on the product surface enters the marking head 2, passes through the marking head 2, and then enters the imaging component, ensuring the synchronization of laser marking and grayscale value detection.

Alternatively, the imaging component can also be placed above the product, and the control component synchronously controls the activation of the marking head 2 and the imaging component to achieve synchronization of laser marking and grayscale value detection.

Step three S3, automatic compensation of gray value: when the actual gray value of the marker point exceeds the preset range, determine the angle of rotation required based on the constructed relationship curve between rotation angle and gray value, and adjust the rotation angle to make the incident The laser energy to the marked point is adapted to the actual gray value.

During the automatic processing, the gray value of the marked point of the product under the marking head 2 is monitored in real time. When the actual gray value of the marked point exceeds the preset range, the difference between the actual gray value and the standard gray value is calculated. Based on The difference and the constructed relationship curve between rotation angle and gray value determine the rotation angle required to compensate for the difference. The movable polarizer P1 is rotated by the rotation angle so that the laser energy incident on the marked point is consistent with the actual gray value. The gray value is adapted to compensate for the change in gray value.

Please refer to the fourth figure and Table 1 to reveal that when the normal gray value is 120, the corresponding angle is -60° or 60°. When the gray value drops to 100 (that is, the difference is 20), the system will call 50 The trend segment between ° and 60°, and it is calculated that by rotating to 55° at this time, the gray value can be adjusted to 120. At the same time, the curve to the left of 0° moves 5° to the right, and the curve to the right of 0° moves 5° to the left.

Furthermore, call the trend segment between 50° and 60°, where 50° corresponds to a gray value of 162, and 60° corresponds to a gray value of 123. Within this range, set the angle to X and the gray value to Y, the trend segment can be approximately regarded as a linear relationship through the constructed relationship curve, so Y=aX+b, bringing the above two sets of data into it, we get Y=-3.9X+357, |50<=X<=60 |.

At this time, Y suddenly drops by 20, and Y1 is set as the gray value function after the drop, then Y1=Y-20, Y1=-3.9X+357-20; since the gray value needs to be restored to 120, that is, Y1=120 , 120=-3.9X+337, so X=55.6° is obtained, that is, the angle to be rotated at this time is calculated. Considering the convenience of actual operation, without affecting the effectiveness of gray value compensation, an angle rotation of 55° can be performed to compensate for the change in gray value.

Please refer to the fifth figure. This embodiment provides a system for automatic real-time grayscale value detection and compensation, including a transmitting component, a marking component, an imaging component, a control component, a folding component and a light polarization adjustment. component, the emitting component, the light polarization adjustment component and the marking component are arranged on the laser marking optical path, the imaging component is arranged on the gray value detection optical path, the emitting component, the marking component, The imaging component and the light polarization adjustment component are respectively connected to the control component. The folding component includes at least one reflecting mirror, which is used to realize folding of the optical path in the laser marking optical path and/or the gray value detection optical path.

The emission component is used for laser emission; the marking component is used to mark products; the imaging component is used to obtain the mark point image while marking and send it to the control component; the control component is used to Analyze the actual gray value of the marker point based on the marker point image, and when the actual gray value exceeds the preset range, determine the rotation angle that needs to be adjusted based on the constructed relationship between rotation angle and gray value and output the rotation angle command. Give the light polarization adjustment component; the light polarization adjustment component is used to perform angular rotation according to the rotation angle instruction, so that the laser energy incident on the marked point through the light polarization adjustment component is consistent with the actual gray value Equipped with; the return component is used to guide the emitted laser to the marking component, and guide the light reflected from the marking point to the imaging component.

The light polarization adjustment component is composed of the aforementioned movable polarizer P1 and the aforementioned fixed polarizer P2, and the movable polarizer P1 can rotate at a preset angle relative to the fixed polarizer P2. This embodiment uses the asymmetric principle of polarized light to change the polarization state of the light wave passing through the fixed polarizer P2 by controlling the angle of the movable polarizer P1, thereby changing the laser energy incident on the marking point, thereby realizing rotation of polarized light. The purpose is to change the laser energy by changing the angle, and then compensate for the change in gray value through the change in laser energy.

The movable polarizer P1 is connected to a driving component; the driving component is connected to the control component, and is used to drive the movable polarizer P1 to rotate at a preset angle under the control of the control component. The driving component can be implemented by a stepper motor or other driving device capable of driving the movable polarizer P1 to rotate at a specific angle.

In this embodiment, the control component controls the emission component and the marking component to realize laser marking processing on the product surface, and at the same time controls the imaging component to acquire the image of the marked point while laser marking, and based on the acquisition The actual gray value of the marked point is obtained from the image. When the actual gray value exceeds the preset range, the rotation angle is output to the light polarization adjustment component and the light polarization is controlled. The state adjustment component adjusts the laser energy incident on the marked point to compensate for the change in the actual gray value, so that the final marked product meets the processing quality requirements and solves the problem of scrapping of large quantities of products due to changes in gray value.

Based on the description of the above embodiments, the operation, use and effects of the present invention can be fully understood. However, the above embodiments are only preferred embodiments of the present invention and should not be used to limit the implementation of the present invention. The scope, that is, simple equivalent changes and modifications based on the patent scope of the present invention and the description of the invention, are all within the scope of the present invention.

S1: Step 1

S2: Step 2

S3: Step three

Claims (7)

A method for automatic real-time gray value detection and compensation, including: constructing a relationship curve between a rotation angle and a gray value of a light polarization adjustment component, the rotation angle corresponding to the laser energy incident on a mark point; The light polarization adjustment component is constructed on a laser mark optical path. The light polarization adjustment component includes a movable polarizer and a fixed polarizer arranged sequentially along the laser mark optical path, and the movable polarizer can be relative to the fixed polarizer. The polarizer rotates to have an adjustable angle, and when the angle of the movable polarizer changes, the intensity and direction of the light incident on the marking point through the light polarization adjustment component also changes; in the laser marking At the same time, an image of the marker point is obtained, and an actual grayscale value of the marker point is obtained based on the acquired image; when the actual grayscale value of the marker point exceeds the preset range, the actual grayscale value is calculated A difference value from a standard gray value, the rotation angle required to compensate for the difference is determined based on the difference value and the constructed relationship curve between the rotation angle and the gray value, and the movable polarizer is rotated by the rotation angle angle to match the laser energy incident on the marked point with the actual gray value. The method of automatic real-time grayscale value detection and compensation as described in claim 1, wherein constructing the relationship curve between the rotation angle and the grayscale value further includes: setting a rotation starting point and a single rotation angle of the movable polarizer; Rotate the movable polarizer clockwise or counterclockwise. Each time the single rotation angle is rotated, an actual angle of the movable polarizer and a corresponding gray value of a marked point are recorded; according to the recorded values of the multiple groups of the movable polarizer The actual angle and the corresponding gray value of the marker point are used to construct a relationship curve between the rotation angle and the gray value. The method of automatic real-time grayscale value detection and compensation as described in claim 1, wherein when the movable polarizer is rotated to be parallel to the polarization direction of the fixed polarizer, the intensity of the light passing through the light polarization adjustment component is maximum ; When the movable polarizer is rotated to be perpendicular to the polarization direction of the fixed polarizer, the intensity of the light passing through the light polarization adjusting component is minimum. A system for automatic real-time grayscale value detection and compensation, including: a launch component, a mark component, an imaging component, a control component and a light polarization adjustment component, the launch component, the light polarization adjustment component and the mark The component is arranged on a laser marking optical path, the imaging component is arranged on a gray value detection optical path, the emission component, the marking component, the imaging component and the light polarization adjustment component are respectively connected to the control component; the emission component The component is used for laser emission; the marking component is used to mark products; the imaging component is used to obtain a marking point image while marking and send it to the control component; the control component is used to according to the marking point image Analyze an actual gray value of a marker point, and when the actual gray value exceeds the preset range, calculate a difference between the actual gray value and a standard gray value, based on the difference and the constructed A relationship curve between a rotation angle and a gray value determines the rotation angle required to compensate for the difference, and outputs the rotation angle instruction to the light polarization adjustment component; the light polarization adjustment component is used to perform operations according to the rotation angle instruction The angle is rotated so that the laser energy incident on the mark point through the light polarization adjustment component matches the actual gray value. The system for automatic real-time grayscale value detection and compensation as described in claim 4, wherein the light polarization adjustment component is composed of a movable polarizer and a fixed polarizer, and the movable polarizer can be relative to the fixed polarizer. Rotate the preset angle. The automatic real-time gray value detection and compensation system as described in claim 5, wherein the movable polarizer is connected to a driving component; the driving component is connected to the control component for driving the activity under the control of the control component The polarizer rotates to a preset angle. The system for automatic real-time grayscale value detection and compensation as described in claim 4, wherein the system further includes a folding component for guiding the emitted laser to the marking component and converting the marking Light reflected from the point is directed to the imaging component.

Images