Intelligent calligraphy writing system and method using clear water

Abstract

The invention belongs to the technical field of intelligent calligraphy writing equipment, and particularly relates to an intelligent calligraphy writing system using clear water, which comprises a writing rack, the writing rack is integrated with a water writing screen, a man-machine interaction module, an image acquisition module, a projection module and a control processor, and the water writing screen is frosted glass with a frosted surface and a smooth bottom surface; the image acquisition module is a high-speed camera and is installed in the writing rack and located below the water writing screen, the control processor is in data signal connection with the image acquisition module, and the projection module is in data signal connection with the control processor and is installed in the writing rack and located under the water writing screen. The man-machine interaction module is electrically connected with the control processor; clear water can be used for replacing printing ink for writing brush calligraphy practice and calligraphy creation, a large amount of printing ink and writing paper do not need to be used, meanwhile, the handwriting stroke of a writer can be effectively reflected, and strokes and stroke orders of the user during writing can be inverted.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent brush writing equipment, and in particular relates to an intelligent brush writing system using clear water. Background Art

[0002] Chinese characters are the recording symbols of the Chinese language. They are morpheme-syllabic characters of the ideographic type and one of the oldest written languages ​​in the world with a history of about 6,000 years. They are an important carrier of China's excellent traditional culture, which has gradually changed from graphics to strokes, from pictograms to symbols, and from complex to simple. Traditional calligraphy is to practice writing on writing paper with a brush dipped in ink. The practice of calligraphy can effectively improve the writer's own writing level and form the writer's own handwriting style.

[0003] Traditional brush calligraphy practice requires a lot of ink and writing paper, which results in a lot of waste. Therefore, many intelligent writing devices have appeared on the market. Current writing devices often use electronic capacitive screens and styluses for writing practice. However, the stylus tip is hard, and it is difficult to effectively simulate the pen tip of the brush when writing, resulting in poor calligraphy practice results. At the same time, some writing devices use software to beautify the stylus tip handwriting, resulting in the writer's inability to correctly understand his or her own writing level and defects. For this reason, we propose an intelligent brush writing system that uses clear water to truly restore the creation and artistic characteristics of calligraphy. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent writing system for Chinese calligraphy using clean water, so as to solve the problems existing in the background technology.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] An intelligent writing system for calligraphy using clean water, comprising a writing stand, wherein the writing stand is integrated with a water writing screen, a human-computer interaction module, an image acquisition module, a projection module and a control processor;

[0007] The water writing screen is located on the surface of the writing stand, and the water writing screen is frosted glass with a frosted surface and a smooth bottom surface;

[0008] The image acquisition module is a high-speed camera, and is installed in the writing stand and located below the water writing screen. The image acquisition module is used to acquire the bottom image of the water writing screen;

[0009] The control processor is connected to the image acquisition module by data signals, and is used to receive the bottom image acquired by the image acquisition module, and process and generate a water writing image;

[0010] The projection module is connected to the control processor by a data signal, installed inside the writing table frame and directly below the water writing screen, and is used to read the water writing handwriting image and project it onto the water writing screen for real-time display;

[0011] The human-computer interaction module is electrically connected to the control processor and is used to manually control the control processor to execute different modes.

[0012] The writing table frame is provided with a placement through groove matching the frosted glass, and the frosted glass and the placement through groove are filled and sealed with an opaque filler.

[0013] The writing table frame is also integrated with a cleaning module. The cleaning module is electrically connected to the main controller. The cleaning module is a hot air dryer and is used to clean the water writing handwriting on the surface of the water writing screen. The hot air dryer is provided with an air duct that can be pulled, extended, and bent.

[0014] The control processor is also integrated with a stroke timing module, a stroke storage module, and a standard character library;

[0015] The control processor determines stroke information based on the water writing handwriting image;

[0016] The stroke timing module is used to obtain the time information corresponding to the stroke information;

[0017] The stroke storage module is used to store the stroke information and the corresponding time information;

[0018] The standard character library is used to store standard fonts of various calligraphies.

[0019] The present invention also provides an intelligent writing method for writing Chinese calligraphy with a writing brush using clear water. The writing method includes:

[0020] Writing step S100: Equipment inspection. Check whether the human-computer interaction module, the image acquisition module, and the projection module are in normal working conditions, and whether there is dirt on the surface of the water writing screen. After the inspection is correct, proceed to the next step;

[0021] Writing step S200: Calibrate the projection module. Through the human-computer interaction module, enter the calibration mode. In the calibration mode, the image acquisition module is in the single-shot acquisition mode, the projection module works continuously, and the stroke timing module and the stroke storage module do not work, so that the projection module projects completely to the bottom of the water writing screen;

[0022] Writing step S300: Dip a regular writing brush in clear water and enter the practice mode through the human-computer interaction module. In the practice mode, the image acquisition module continuously and rapidly acquires the bottom image of the water-writing screen, the projection module keeps working continuously, the stroke timing module and the stroke storage module keep working. At this time, calligraphy practice is carried out on the water-writing screen;

[0023] Writing step S400: The image acquisition module continuously and rapidly acquires the bottom image of the water-writing screen in real time. The control processor receives the acquired bottom image in real time and processes it to generate a water-written handwriting image. Then, the projection module reads the water-written handwriting image and projects it onto the bottom of the water-writing screen in real time for display;

[0024] Writing step S500: After writing is completed, enter the screen-clearing mode through the human-computer interaction module. In the screen-clearing mode, the image acquisition module, the projection module, the stroke timing module, and the stroke storage module do not work. The cleaning module dries the surface of the water-writing screen to remove the traces of clear water.

[0025] The specific correction steps in the writing step S200 include the following:

[0026] Correction step S100: The image acquisition module acquires the bottom image of the water-writing screen once. The control processor receives this bottom image and extracts the image border of the water-writing screen and the coordinate information of each corner of the image border of the water-writing screen to obtain the size information of the image border of the water-writing screen;

[0027] Correction step S200: Control the projection module to project onto the bottom of the water-writing screen from directly below the water-writing screen. The image acquisition module acquires the bottom image of the water-writing screen again. The control processor receives this bottom image and extracts the image border of the projection area and the coordinate information of each corner of the image border of the projection area to obtain the size information of the image border of the projection area;

[0028] Correction step S300: According to the size information of the image border of the water-writing screen, the control processor automatically adjusts the projection area of the projection module so that the size information of the image border of the projection area is adjusted to the size information of the image border of the water-writing screen;

[0029] Correction step S400: Repeat the above correction steps S100 to S300 until the error between the calibrated projection area and the bottom of the water-writing screen is less than the preset value, then the correction is completed.

[0030] The specific steps in the writing step S400 include the following:

[0031] Writing step S410: The image acquisition module continuously and rapidly acquires the bottom image of the water-writing screen in real time. The control processor receives the bottom image of the water-writing screen and extracts the image border of the water-writing screen;

[0032] Writing step S420: Control the processor to process and recognize the image within the image border of the water writing screen to obtain the water writing stroke image. At the same time, control the processor to obtain stroke information based on the end frame of the stroke, and the stroke timing module obtains the corresponding time information for the stroke information. The stroke storage module stores the stroke information and the time information;

[0033] Writing step S430: The projection module reads the water writing stroke image and projects the water writing stroke image from directly below the water writing screen to the bottom of the water writing screen in real time, thereby completing the real-time display of the water writing stroke image.

[0034] The writing step S420 further includes the following determination processes:

[0035] Determination A: For two consecutive frames of images during the writing process, the water writing strokes processed in the earlier image frame are saved, and the water writing strokes already processed and saved in the earlier image frame are not processed in the later image frame;

[0036] Determination B: For two consecutive frames of images during the writing process, perform segmentation processing using a gray scale threshold. In the comparison between the later image frame and the earlier image frame, the part with a gray scale value lower than the preset gray scale value and a change in gray scale value between the two frames exceeding the preset value is used as the new water writing stroke, and the water writing stroke image is updated;

[0037] Determination C: For two consecutive frames of images during the writing process, if the new water writing stroke is not continuous with the earlier water writing stroke, it is determined that the water writing stroke in the earlier image frame is the end frame of the stroke, and the water writing stroke in the later image frame is the start frame of the new stroke;

[0038] Otherwise, it is determined that the earlier image frame and the later image frame are consecutive frames of the stroke;

[0039] Determination D: After the determination of the earlier stroke is completed, reset determination C and perform the determination of the next stroke.

[0040] After the writing step S400, there is also a stroke order inversion step, specifically:

[0041] Inversion step S100: After writing is completed, enter the inversion mode through the human-computer interaction module. In the inversion mode, the image acquisition module, the stroke timing module, and the stroke storage module do not work, and the projection module works. The projection module obtains the stroke information and time information in the stroke storage module, and projects the stroke information at the bottom of the water writing screen in sequence according to the time information order to complete the inversion of the stroke order;

[0042] After the writing step S200, there is also a calligraphy copying step, specifically:

[0043] Copying steps S100: After calibration is completed, enter the copying mode through the human-computer interaction module. In the copying mode, the image acquisition module does not work first, and the projection module works continuously. The projection module reads the characters in the standard character library and projects the characters continuously at the bottom of the water writing screen;

[0044] Copying steps S200: Dip a regular writing brush in clear water and perform calligraphy copying on the water writing screen according to the projection at the bottom of the writing screen;

[0045] Copying steps S300: After the character copying is completed, the projection module stops working, and the image acquisition module starts to work and is in the single-shot acquisition mode. The bottom image of the water writing screen is acquired and recognized to obtain the copied handwriting image.

[0046] The present invention can use clear water to replace ink for calligraphy practice and calligraphy creation with a writing brush, without the need to use a large amount of ink and writing paper. At the same time, it can effectively reflect the writing strokes and pen tips of the writer and invert the strokes and stroke order when the user is writing. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention can be further described by the non-limiting embodiments given in the drawings.

[0048] Figure 1 It is a schematic structural diagram of the system framework of the present invention;

[0049] Figure 2 It is a schematic diagram of the physical assembly of the system framework of the present invention;

[0050] Figure 3 It is a schematic flowchart of the writing method of the present invention;

[0051] Figure 4 It is a schematic flowchart of the calligraphy copying of the present invention;

[0052] Figure 5 It is a schematic flowchart of the update process of the water-written handwriting of the present invention;

[0053] Figure 6 It is a schematic flowchart of the stroke determination process of the water-written handwriting of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] In order to enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0055] Embodiment 1, as Figure 1 and Figure 2 shown, a smart writing system for Chinese calligraphy using clear water includes a writing table frame, and the writing table frame is integrated with a water writing screen, a human-computer interaction module, an image acquisition module, a projection module, and a control processor;

[0056] The water-writing screen is located on the surface of the writing table frame. The water-writing screen is frosted glass with a frosted surface and a smooth bottom surface;

[0057] The image acquisition module is a high-speed camera and is installed inside the writing table frame and below the water-writing screen. The image acquisition module is used to acquire the bottom image of the water-writing screen;

[0058] The control processor is connected by a data signal to the image acquisition module, and is used to receive the bottom image acquired by the image acquisition module and process it to generate a water-writing stroke image;

[0059] The projection module is connected by a data signal to the control processor, is installed inside the writing table frame and directly below the water-writing screen, and is used to read the water-writing stroke image and project it onto the water-writing screen in real time for display;

[0060] The human-computer interaction module is electrically connected to the control processor and is used to manually control the control processor to execute different modes.

[0061] In this embodiment, after testing various materials, the water-writing screen is made of frosted glass with a frosted surface and a smooth bottom surface. The purposes are as follows:

[0062] ① When writing with a writing brush dipped in clear water on the rough surface of the frosted glass, the clear water strokes can be well-shaped and will not flow around;

[0063] ② After leaving clear water strokes on the rough surface of the frosted glass, the concave and convex rough surfaces at the stroke positions will be filled by the clear water, making the clear water strokes clear. This is beneficial for the image acquisition module to clearly acquire the clear water strokes on the surface of the frosted glass. At the same time, the projection image projected by the projection module covering the bottom of the water-writing screen can also be clearly visible at the clear water stroke positions;

[0064] ③ The rough and uneven granular feeling on the surface of the frosted glass can well simulate the writing texture of rice paper itself, and can correctly reflect the writing strokes and pen tips when writing with a writing brush dipped in clear water. However, during the writing process of traditional capacitive touch screens and styluses, the pen tips during the writing process of the writer cannot be correctly reflected.

[0065] At the same time, the lenses of the image acquisition module and the projection module in this embodiment are both parallel to the surface of the water-writing screen table, so that the acquired images will not be distorted. And the projection module is installed directly below the water-writing screen. Here, "directly below" means that the geometric center of the bottom surface of the water-writing screen corresponds to the geometric center of the lens of the projection module, so that when the projection module projects, it can evenly cover and project onto the bottom surface of the water-writing screen.

[0066] As a further description of the writing desk, the writing desk is provided with a placement groove matching the frosted glass, and the frosted glass and the placement groove are filled and sealed with an opaque filler. The filling material can be filled and sealed with adhesives such as glass glue, which can meet the requirements of fixation and opaque sealing at the same time.

[0067] As a supplement to the above embodiment, the writing stand is also integrated with a cleaning module, which is electrically connected to the main controller. The cleaning module is a hot air dryer and is used to clean the water writing on the surface of the water writing screen. The hot air dryer is provided with an air duct that can be pulled, extended and bent. When clearing the water writing on the frosted glass surface, the hot air dryer of the cleaning module is opened, the air duct is pulled towards the water writing, and the water writing is dried by the hot air blown out, thereby achieving a good handwriting cleaning effect.

[0068] As a further supplement to this embodiment, the control processor is also integrated with a stroke timing module, a stroke storage module and a standard character library;

[0069] The control processor determines the stroke information according to the water-written handwriting image;

[0070] The stroke timing module is used to obtain the time information corresponding to the stroke information;

[0071] The stroke storage module is used to store stroke information and corresponding time information;

[0072] The standard character library is used to store standard fonts for various types of calligraphy. The standard character library can also store fonts for various famous calligraphers.

[0073] Embodiment 2, based on embodiment 1, provides a method for writing calligraphy with a brush using clear water, such as Figure 3 and Figure 6 As shown, the writing method includes:

[0074] Writing step S100: Equipment inspection, check whether the human-computer interaction module, image acquisition module, and projection module are in normal working condition, whether there is dirt on the surface of the water writing screen, etc., and proceed to the next step after the inspection is correct;

[0075] Writing step S200: calibrating the projection module, and performing the calibration mode through the human-computer interaction module. In the calibration mode, the image acquisition module is in a single acquisition mode, the projection module works continuously, and the stroke timing module and the stroke storage module do not work, so that the projection module is completely projected to the bottom of the water writing screen;

[0076] The calibration process includes the following steps:

[0077] Calibration step S100: The image acquisition module captures the bottom image of the water-writing screen once. The control processor receives the bottom image and extracts the image border of the water-writing screen and the coordinate information of each corner of the image border of the water-writing screen, obtaining the size information of the image border of the water-writing screen;

[0078] Calibration step S200: The control projection module projects from directly below the water-writing screen to the bottom of the water-writing screen. The image acquisition module acquires the bottom image of the water-writing screen again. The control processor receives the bottom image and extracts the image border of the projection area and the coordinate information of each corner of the image border of the projection area, obtaining the size information of the image border of the projection area;

[0079] Calibration step S300: According to the size information of the image border of the water-writing screen, the control processor automatically adjusts the projection area of the projection module so that the size information of the image border of the projection area is adjusted to the size information of the image border of the water-writing screen;

[0080] Calibration step S400: Repeat the above calibration steps S100 to S300 until the error between the calibrated projection area and the bottom of the water-writing screen is less than the preset value, then the calibration is completed; Through the above calibration steps, the projection area of the projection module can be effectively adjusted so that the projection area of the projection module can just cover the bottom of the water-writing screen;

[0081] Writing step S300: Dip a regular writing brush in clear water and enter the practice mode through the human-computer interaction module. In the practice mode, the image acquisition module will continuously and rapidly capture the bottom image of the water-writing screen, the projection module will keep working, and the stroke timing module and the stroke storage module will keep working. At this time, calligraphy practice is carried out on the water-writing screen;

[0082] Writing step S400: The image acquisition module rapidly captures the bottom image of the water-writing screen in real time. The control processor receives the captured bottom image in real time and processes it to generate a water-writing stroke image. Then the projection module reads the water-writing stroke image and projects it onto the bottom of the water-writing screen for display in real time;

[0083] This step specifically includes:

[0084] Writing step S410: The image acquisition module rapidly captures the bottom image of the water-writing screen in real time. The control processor receives the bottom image of the water-writing screen and extracts the image border of the water-writing screen;

[0085] Writing step S420: The control processor processes and recognizes the image within the image border of the water-writing screen to obtain a water-writing stroke image. At the same time, the control processor obtains stroke information according to the end frame of the stroke, and the stroke timing module obtains the time information corresponding to the stroke information. The stroke storage module stores the stroke information and the time information;

[0086] Among them, this step includes the following determinations for handwriting and strokes:

[0087] Determination A: For two consecutive frames of images during the writing process, the water-writing handwriting processed in the prior image frame is saved, and the water-writing handwriting already processed and saved in the prior image frame is not processed in the subsequent image frame;

[0088] Determination B: For two consecutive frames of images during the writing process, segmentation processing is performed using a gray-scale threshold. In the comparison between the subsequent image frame and the prior image frame, the part with a gray value lower than the preset gray value and the change in gray value between the two frames exceeding the preset value is used as the new water-writing handwriting, and the water-writing handwriting image is updated;

[0089] Determination C: For two consecutive frames of images during the writing process, if the new water-writing handwriting is not continuous with the prior water-writing handwriting, it is determined that the water-writing handwriting in the prior image frame is the end frame of this stroke, and the water-writing handwriting in the subsequent image frame is the start frame of the new stroke; otherwise, it is determined that the prior image frame and the subsequent image frame are consecutive frames of this stroke;

[0090] Determination D: After the determination of the prior stroke is completed, reset Determination C and perform the determination of the next stroke;

[0091] Through the above determinations, it is possible to effectively determine the water-writing handwriting image and display the handwriting during the water-writing process in real time;

[0092] Writing step S430: The projection module reads the water-writing handwriting image and projects the water-writing handwriting image from directly below the water-writing screen to the bottom of the water-writing screen in real time, thereby completing the real-time display of the water-writing handwriting image;

[0093] In this way, during the water-writing process of people, the handwriting can be projected and displayed through the projection module, making the water-writing process more real and closer to ink writing.

[0094] Writing step S500: After writing is completed, enter the screen-clearing mode through the human-computer interaction module. In the screen-clearing mode, the image acquisition module, the projection module, the stroke timing module, and the stroke storage module do not work, and the cleaning module dries the surface of the water-writing screen to remove the clear water marks.

[0095] In this embodiment, after the writing step S400, there is also a stroke sequence inversion step, specifically:

[0096] Inversion step S100: After writing is completed, enter the inversion mode through the human-computer interaction module. In the inversion mode, the image acquisition module, the stroke timing module, and the stroke storage module do not work, while the projection module works. The projection module obtains the stroke information and time information in the stroke storage module, and projects the stroke information at the bottom of the water-writing screen in sequence according to the time information sequence to complete the inversion of the stroke order.

[0097] In this embodiment, after the writing step S200, a calligraphy copying step is further included, specifically:

[0098] Copying step S100: After calibration is completed, enter the copying mode through the human-computer interaction module. In the copying mode, the image acquisition module does not work first, and the projection module works continuously. The projection module reads the characters in the standard character library and projects the characters continuously at the bottom of the water-writing screen.

[0099] Copying step S200: Dip a regular writing brush in clear water and perform calligraphy copying on the water-writing screen according to the projection at the bottom of the writing screen.

[0100] Copying step S300: After the character copying is completed, the projection module stops working, and the image acquisition module starts to work and is in the single-shot acquisition mode. The image at the bottom of the water-writing screen is acquired and recognized to obtain the copied handwriting image.

[0101] Finally, it should be noted that the writing handwriting obtained after the writing step 400 and the copied handwriting obtained after the copying step S300 can both be compared with the characters in the standard character library, and the writing or copied handwriting can be evaluated through indicators such as similarity and coincidence degree to evaluate the calligraphy level of the writer.

[0102] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An intelligent writing system for calligraphy using clean water, characterized in that: It includes a writing stand, which is integrated with a water writing screen, a human-computer interaction module, an image acquisition module, a projection module and a control processor; The water writing screen is located on the surface of the writing stand, and the water writing screen is frosted glass with a frosted surface and a smooth bottom surface; The image acquisition module is a high-speed camera, and is installed in the writing stand and located below the water writing screen. The image acquisition module is used to acquire the bottom image of the water writing screen; The control processor is connected to the image acquisition module by data signals, and is used to receive the bottom image acquired by the image acquisition module, and process and generate a water writing image; The projection module is connected to the control processor by data signals, is installed in the writing stand and is located directly below the water writing screen, and is used to read the water writing image and project it to the water writing screen in real time for display; The human-computer interaction module is electrically connected to the control processor and is used to manually control the control processor to execute different modes.

2. The intelligent writing system for calligraphy using clean water according to claim 1, characterized in that: The writing table frame is provided with a placement groove matching the frosted glass, and the frosted glass and the placement groove are filled and sealed with a light-proof filling material.

3. The intelligent writing system for calligraphy using clean water according to claim 2, characterized in that: The writing stand is also integrated with a cleaning module, which is electrically connected to the main controller. The cleaning module is a hot air dryer and is used to clean the water writing on the surface of the water writing screen. The hot air dryer is provided with an air duct that can be pulled, extended and bent.

4. The intelligent writing system for calligraphy using clean water according to claim 3, characterized in that: The control processor is also integrated with a stroke timing module, a stroke storage module and a standard character library; The control processor determines the stroke information according to the water-written handwriting image; The stroke timing module is used to obtain the time information corresponding to the stroke information; The stroke storage module is used to store the stroke information and the corresponding time information; The standard character library is used to store standard fonts for various types of calligraphy.

5. A method for writing Chinese characters with a brush using clean water, comprising the system for writing Chinese characters with a brush using clean water as claimed in any one of claims 1 to 4, characterized in that: The writing method comprises: Writing step S100: Equipment inspection, check whether the human-computer interaction module, image acquisition module, and projection module are in normal working condition, whether there is dirt on the surface of the water writing screen, etc., and proceed to the next step after the inspection is correct; Writing step S200: calibrating the projection module, and performing the calibration mode through the human-computer interaction module. In the calibration mode, the image acquisition module is in a single acquisition mode, the projection module works continuously, and the stroke timing module and the stroke storage module do not work, so that the projection module is completely projected to the bottom of the water writing screen; Writing step S300: Use an ordinary brush to dip in water and enter the practice mode through the human-computer interaction module. In the practice mode, the image acquisition module will continue to collect the bottom image of the water writing screen at high speed, the projection module will continue to work, and the stroke timing module and the stroke storage module will continue to work. At this time, calligraphy practice is performed on the water writing screen; Writing step S400: the image acquisition module acquires the bottom image of the water writing screen in real time at high speed, receives the acquired bottom image in real time through the control processor and processes it to generate a water writing handwriting image, and then the projection module reads the water writing handwriting image and projects it to the bottom of the water writing screen in real time for display; Writing step S500: After writing is completed, the human-computer interaction module enters the screen clearing mode. In the screen clearing mode, the image acquisition module, the projection module, the stroke timing module and the stroke storage module do not work, and the cleaning module dries the surface of the water writing screen to remove the traces of water.

6. The intelligent writing method of brush calligraphy using clean water according to claim 5, characterized in that: The writing step S200 specifically includes the following correction steps: Correction step S100: the image acquisition module acquires the bottom image of the water writing screen once, and the control processor receives the bottom image and extracts the image frame of the water writing screen and the coordinate information of each corner of the image frame of the water writing screen to obtain the size information of the image frame of the water writing screen; Correction step S200: Control the projection module to project from the bottom of the water writing screen to the bottom of the water writing screen, the image acquisition module acquires the bottom image of the water writing screen again, the control processor receives the bottom image and extracts the image frame of the projection area and the coordinate information of each corner of the image frame of the projection area, and obtains the size information of the image frame of the projection area; Correction step S300: According to the size information of the image frame of the water writing screen, the control processor automatically adjusts the projection area of ​​the projection module so that the size information of the image frame of the projection area is adjusted to the size information of the image frame of the water writing screen; Calibration step S400: repeat the calibration steps S100 to S300 until the error between the calibrated projection area and the bottom of the water writing screen is less than a preset value, and then the calibration is completed.

7. The intelligent writing method of brush calligraphy using clean water according to claim 6, characterized in that: The writing step S400 specifically includes the following steps: Writing step S410: the image acquisition module acquires the bottom image of the water writing screen in real time and at high speed, and the control processor receives the bottom image of the water writing screen and extracts the image frame of the water writing screen; Writing step S420: the control processor processes and recognizes the image within the image frame of the water writing screen to obtain a water writing handwriting image, and at the same time controls the processor to obtain stroke information according to the end frame of the stroke, and obtains time information corresponding to the stroke information by the stroke timing module, and the stroke storage module stores the stroke information and the time information; Writing step S430: The projection module reads the water writing handwriting image, and projects the water writing handwriting image from directly below the water writing screen to the bottom of the water writing screen in real time, thereby completing the real-time display of the water writing handwriting image.

8. The intelligent writing method of brush calligraphy using clean water according to claim 7, characterized in that: The writing step S420 also includes the following determination process: Decision A: For two consecutive frames of images during the writing process, the water writing handwriting processed in the previous frame is saved, and the water writing handwriting processed and saved in the previous frame is not processed in the subsequent frame; Decision B: For two consecutive frames of images during the writing process, segmentation is performed using the grayscale threshold. In the comparison between the later image frame and the earlier image frame, the portion whose grayscale value is lower than the grayscale preset value and whose grayscale value change between the previous and next frames exceeds the preset value is taken as the new water writing handwriting, and the water writing handwriting image is updated; Determination C: For two consecutive frames of images during the writing process, if the new water-written handwriting is not continuous with the previous water-written handwriting, the water-written handwriting in the previous image frame is determined to be the end frame of the stroke, and the water-written handwriting in the subsequent image frame is determined to be the start frame of the new stroke; Otherwise, determining that the previous image frame and the subsequent image frame are continuous frames of the stroke; Determination D: After the previous stroke determination is completed, determination C is reset and the next stroke determination is performed.

9. The intelligent writing method of calligraphy with clean water according to claim 8, characterized in that: After the writing step S400, a stroke order inversion step is also included, specifically: Inversion step S100: After writing is completed, the inversion mode is entered through the human-computer interaction module. In the inversion mode, the image acquisition module, the stroke timing module and the stroke storage module are not working, and the projection module is working. The projection module obtains the stroke information and time information in the stroke storage module, and projects the stroke information at the bottom of the water writing screen in sequence according to the time information to complete the inversion of the stroke order.

10. The intelligent writing method of brush calligraphy using clean water according to claim 5, characterized in that: After the writing step S200, the method further includes a calligraphy copying step, which is specifically: Copying step S100: After the correction is completed, the copying mode is entered through the human-computer interaction module. In the copying mode, the image acquisition module does not work first, and the projection module continues to work. The projection module reads the text in the standard character library and continuously projects the text on the bottom of the water writing screen; Copying step S200: using an ordinary brush dipped in clear water, following the bottom projection of the writing screen, copying calligraphy on the water writing screen; Copying step S300: After the text copying is completed, the projection module stops working, and the image acquisition module starts working in a single acquisition mode, collecting and identifying the bottom image of the water writing screen to obtain a copy handwriting image.

Images