A remote intelligent light and shadow interactive painting teaching device and its application

Abstract

The present invention discloses a remote intelligent light and shadow interactive painting teaching device and its application. The device can be applied to teachers' remote painting teaching or intelligent painting teaching, including a light and shadow interactive system, a column, a vertical joint, an auxiliary base plate, a horizontal joint, a base plate and a drawing board; the base plate and one side of the auxiliary base plate are connected by a horizontal joint; the drawing board is placed on the base plate; there is a column on the other side of the auxiliary base plate, and the column is connected to the auxiliary base plate by a vertical joint. The vertical joint has a limited position function, and the column is limited to the vertical auxiliary base plate; the light and shadow interactive system includes a light and shadow interactive controller, a card holder, a projection lamp and a camera. The device of the present invention has a simple structure, low manufacturing and use costs, can be easily disassembled, folded and portable, and is particularly suitable for remote teaching of practical painting courses during the epidemic.

Description

Technical Field

[0001] The invention relates to the field of photoelectric teaching equipment, and in particular to a remote intelligent light and shadow interactive painting teaching device and application thereof. Background Art

[0002] The traditional teaching mode of painting is to teach on-site by teachers or with the help of textbooks, such as sketching, oil painting, gouache painting, Chinese painting and simple drawing. The teaching method of painting is highly practical. Due to the relatively standardized requirements for brushstrokes and coloring order, students are highly dependent on teachers' on-site guidance, which is not conducive to teachers' remote collective teaching. Some existing pseudo-holographic projection painting practice tools lack interactivity and can only meet students' copying homework, which has limitations in teaching methods. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a remote intelligent light and shadow interactive painting guidance device and its application, which can carry out remote painting teaching, including remote painting demonstration by teachers or intelligent painting guidance, and is particularly suitable for remote teaching of practical painting courses during the epidemic.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A remote intelligent light and shadow interactive painting teaching device comprises a light and shadow interactive system 1, a column 2, a vertical joint 3, an auxiliary base plate 4, a horizontal joint 5, a base plate 6 and a drawing board 7; the light and shadow interactive system 1 comprises a light and shadow interactive controller 10, a deck 11, a projection lamp 12 and a camera 13.

[0006] The base plate 6 and one side of the auxiliary base plate 4 are connected by a horizontal joint 5. When in use, the base plate 6 and the auxiliary base plate 4 are in a plane and are placed on a desktop or an easel; the drawing board 7 is placed in a limiting groove on the base plate 6, and its position is relatively fixed; there is a column 2 on the other side of the auxiliary base plate 4, and the column 2 is connected to the auxiliary base plate 4 by a vertical joint 3. The vertical joint 3 has a limiting function, which limits the column 2 to the vertical auxiliary base plate 4; the light and shadow interactive system 1 is plugged into the top of the column 2 through the card holder 11, and one side of the light and shadow interactive controller 10 is fixedly connected to the card holder 11, and the other side of the light and shadow interactive controller 10 is equipped with a projection lamp 12 and a camera 13 and faces the direction of the drawing board 7.

[0007] The drawing teaching device also includes a pressing ball 8 and a spring joint 9; spring joints 9 are installed on the four corners of the front of the drawing board 7, and a pressing ball 8 is fixed to the top of the spring joint 9, so that the pressing ball 8 has positive pressure on the drawing board 7; the drawing paper or canvas is pressed and spread on the drawing board through four pairs of spring joints 9 and pressing balls 8; the four pressing balls 8 also play the role of machine vision positioning of the drawing board 7 by the camera.

[0008] The light and shadow interactive system 1 also includes a semi-transparent plate 15, which is a transparent hard material, such as organic glass or transparent plastic; the semi-transparent plate 15 is installed on the other side of the top of the light and shadow interactive controller 10 (that is, on the same side as the projection lamp 12 and the camera 13) through a positioning joint 14. The semi-transparent plate 15 can be positioned at any position between 0 and 270 degrees, and the semi-transparent plate 15 plays the role of transmitting and reflecting light.

[0009] The light and shadow interactive controller 10 is built with a central processing unit, a network switch, a voice system and a data interface.

[0010] The remote intelligent light and shadow interactive painting guidance device can be applied to teachers' remote painting guidance or intelligent painting guidance.

[0011] When the teacher is guiding students through painting remotely, both the teacher and the student use the remote intelligent light and shadow interactive painting guiding device. The teacher draws on the drawing paper, and the camera 13 captures the image information on the drawing paper of the teacher's device in real time. The semi-transparent plate 15 of the teacher's device is positioned at 0 degrees. The camera 13 collects the image information of the collection area 18, connects with the student's device through the network switch, and transmits the image information to the student's device; the semi-transparent plate 15 of the student's device is positioned at a suitable angle, so that part of the light of the image information transmitted from the teacher's end is reflected on the front of the auxiliary base plate 4 for reference, and part of the light is transmitted through the semi-transparent plate 15 on the drawing board 7 of the student's device for copying; at the same time, the teacher guides the students to learn painting through the voice system. When the semi-transparent plate 15 of the student's device is folded, the camera 13 can feed back the real-time image information of the student's painting to the teacher's end, and project it on the drawing board 7 of the teacher's end, which is convenient for the teacher to guide online.

[0012] More specifically, the teacher's remote painting guidance includes the following steps:

[0013] (1) The teacher / student side puts away the semi-transparent board, and the camera locates the drawing board within the viewing range, identifies and marks the center coordinates of the four pressed balls (X n ,Y n ), and use the compressed sphere center coordinates with the same horizontal and vertical positions to correct the coordinates of the light and shadow interactive system and the projection lamp;

[0014] (2) The camera on the teacher / student side collects images within the coordinate plane of the drawing board, that is, the RGB data of each coordinate point, and the data matrix is ​​recorded as the background color data of the blank paper;

[0015] (3) The teacher draws on the drawing paper. The camera on the teacher's end scans the RGB data within the coordinate plane, stores the RGB data of the coordinate points where the data change exceeds the threshold, and transmits the coordinate data and RGB data to the network switch;

[0016] (4) The student opens the semi-transparent panel, and the network switch receives the coordinate data and RGB data from the teacher. The central processor controls the projection lamp to project the light and shadow pattern of the teacher's drawing board within the coordinate plane of the student's drawing board. The light and shadow pattern of the teacher's drawing board is also displayed on the auxiliary baseboard. The student draws according to the light and shadow pattern of the drawing board.

[0017] (5) After the student finishes drawing, the projection light on the student side is turned off, the semi-transparent board is folded up, the camera is started and the RGB data is scanned within the coordinate plane of the drawing board. The RGB data of the coordinate points where the data change exceeds the threshold is stored, and the coordinate data and RGB data are transmitted to the network switch;

[0018] (6) The network switch at the teacher's end receives the coordinate data and RGB data at the student's end, and the central processor controls the projection light to project the light and shadow pattern of the student's drawing board within the coordinate plane of the teacher's drawing board;

[0019] (7) The teacher replaces the blank drawing paper, watches the light and shadow pattern on the drawing board of the student, and annotates and guides on the new blank drawing paper with a pen; then the device on the teacher repeats step (3) and transmits the teacher's annotation and guidance data to the network switch;

[0020] (8) The student device repeats step (4) and projects the teacher's annotation guidance data onto the student's drawing board, superimposing the teacher's annotation guidance opinions on the student's drawing, and receiving the teacher's guidance in real time.

[0021] When guiding students with intelligent painting, teachers prepare the target image into a guidance program in advance, store or remotely download it to the light and shadow interactive system 1 of the student-end device, and the projection lamp 12 projects lines or colors in sequence according to the standard painting steps. The semi-transparent plate 15 is positioned at a suitable angle (0-90°), so that part of the light of the same image is reflected on the front of the auxiliary base plate 4 for reference, and part of the light is transmitted through the semi-transparent plate 15 to the drawing board 7 of the student-end device for copying; after the student's work is completed, the semi-transparent plate 15 is put away, and the camera 13 takes a real-time picture of the image on the student's drawing paper, compares the image on the drawing paper with the target image inside the light and shadow interactive system in terms of outline and color, and uses the projection lamp 12 to project the parts with low compliance on the drawing paper as flashing prompts. In this working mode, the projection lamp 12 and the camera 13 switch to work at a higher frequency, projecting images and collecting student images in real time.

[0022] More specifically, the intelligent painting tutorial includes the following steps:

[0023] (1) The student puts away the semi-transparent board, and the camera locates the drawing board within the viewing range, identifies and marks the center coordinates of the four pressing balls (X n ,Y n), and use the compressed sphere center coordinates with the same horizontal and vertical positions to correct the coordinates of the light and shadow interactive system and the projection lamp;

[0024] (2 The camera on the student end collects images within the coordinate plane of the drawing board, that is, the RGB data of each coordinate point, and the data matrix is ​​recorded as the background color data of the blank paper;

[0025] (3) The semi-transparent plate is opened, and the CPU sends the corrected coordinate information of the target image to the projector in groups of coordinate values ​​and RGB data according to the stroke sequence of the painting plan. The projector projects the light and shadow information onto the drawing board and displays it on the auxiliary base plate at the same time. Students copy and paint according to the light and shadow information pattern on the drawing board.

[0026] (4) After the student finishes drawing, the projection light on the student side is turned off, the semi-transparent board is folded up, the camera is started and the RGB data within the coordinate plane of the drawing board is scanned. The RGB data of the same coordinate points are compared with the target image data of the light and shadow interactive system. The image data of the continuous coordinate points within a certain range whose RGB data exceeds the threshold is recorded;

[0027] (5) The camera on the student end is turned off, and the projection light is turned on. The part of the image data recorded in step (4) that exceeds the threshold value is flashed at a certain visible frequency and projected onto the drawing board on the student end to prompt the student to make corrections;

[0028] (6) After the student modifies the painting, steps (4) and (5) are repeated until the degree of consistency between the student's work and the system's target image reaches a preset value, and the student completes a copy painting exercise.

[0029] Compared with the prior art, the present invention has the following advantages and effects:

[0030] (1) The present invention utilizes color projection interactive technology and relies on remote networks to enable teachers to demonstrate painting remotely. Students can use the device of the present invention to complete copying learning, and teachers can provide remote online guidance. Alternatively, existing paintings can be made into teaching programs, and students can be taught to self-study the stroke sequence and coloring rendering steps in an offline manner. The program also has a real-time correction reminder function. The learning method is technologically advanced and is particularly suitable for remote teaching of practical painting courses during the epidemic.

[0031] (2) The device of the present invention has a simple structure, low manufacturing and use costs, can be easily disassembled, folded and carried, is suitable for students or painting beginners, and is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural front view of the painting teaching device in the projection state.

[0033] Figure 2It is a structural front view of the painting teaching device in the camera state.

[0034] Figure 3 This is a top view of the structure of the painting teaching device.

[0035] Figure 4 This is a schematic diagram of the folding of the painting teaching device.

[0036] Figure 5 This is a structural diagram of the light and shadow interactive system.

[0037] Figure 6 is an example target image.

[0038] Figure 7 Plot the steps in solid lines for an example target image.

[0039] Figure 8 Draw the steps in dashed lines for example target images.

[0040] Fig. 9 Plot the steps for shading of an example target image.

[0041] Fig.10 This is a flowchart of the program for the teacher’s remote learning model.

[0042] Fig.11 This is the program flow chart of the intelligent teaching mode.

[0043] Among them: 1. Light and shadow interactive system; 2. Column; 3. Vertical joint; 4. Auxiliary base plate; 5. Horizontal joint; 6. Base plate; 7. Drawing board; 8. Pressing ball; 9. Spring joint; 10. Light and shadow interactive controller; 11. Card seat; 12 Projection lamp; 13. Camera; 14. Positioning joint; 15. Semi-transparent plate; 16. Projection area; 17. Reflection area; 18. Collection area. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below with reference to examples, but the embodiments of the present invention are not limited thereto.

[0045] Example 1

[0046] A remote intelligent light and shadow interactive painting teaching device can be used for teachers' remote painting teaching or intelligent painting teaching; it includes a light and shadow interactive system 1, a column 2, a vertical joint 3, an auxiliary base plate 4, a horizontal joint 5, a base plate 6 and a drawing board 7. The front view of the device when opened is as follows Figure 1As shown, the bottom plate 6 and one side of the auxiliary bottom plate 4 are connected by a horizontal joint 5. When in use, the bottom plate 6 and the auxiliary bottom plate 4 are in a plane and are placed on a desktop or easel; the drawing board 7 is placed in the limiting groove on the bottom plate 6, and the position is relatively fixed; there is a column 2 on the other side of the auxiliary bottom plate 4, and the column 2 is connected to the auxiliary bottom plate 4 by a vertical joint 3. The vertical joint 3 has a limiting function, which limits the column 2 to the plane vertical to the auxiliary bottom plate 4. It also includes a clamping ball 8 and a spring joint 9; the four corners of the front of the drawing board 7 are installed with a spring joint 9, and a clamping ball 8 is fixed on the top of the spring joint 9, so that the clamping ball 8 has a positive pressure on the drawing board 7, as shown in FIG. Figure 1 and Figure 3 As shown; the drawing paper or canvas is pressed and spread on the drawing board through four pairs of spring joints 9 and pressing balls 8; the four pressing balls 8 also play the role of machine vision positioning of the drawing board 7 by the camera.

[0047] The light and shadow interactive system 1 includes a light and shadow interactive controller 10, a card holder 11, a projection lamp 12 and a camera 13. The light and shadow interactive system 1 is plugged into the top of the column 2 through the card holder 11, one side of the light and shadow interactive controller 10 is fixedly connected to the card holder 11, and the other side of the light and shadow interactive controller 10 is equipped with a projection lamp 12 and a camera 13 and faces the direction of the drawing board 7. It also includes a semi-transparent plate 15, which is a transparent hard material, such as organic glass or transparent plastic; Figure 5 As shown, the semi-transparent plate 15 is installed on the other side of the top of the light and shadow interactive controller 10 (i.e., on the same side as the projection lamp 12 and the camera 13) through the positioning joint 14. The semi-transparent plate 15 can be positioned at any position between 0 and 270 degrees, and the semi-transparent plate 15 plays the role of transmitting and reflecting light. The light and shadow interactive controller 10 is built with a central processing unit, a network switch, a voice system, a data interface, etc., which are used for real-time communication between teachers and students during remote painting guidance.

[0048] When using the device, Figure 1 , Figure 2 and Figure 3 As shown, the light and shadow interactive system 1 is powered by a wired power supply or a battery. The central processor projects a target image from the left side through a projection lamp 12 at a certain angle (0-90°) through a semi-transparent plate 15 onto a drawing board 7. Drawing paper or canvas is pressed on the drawing board 7 by a pressing ball 8 to fill the entire projection area 16; a part of the light is reflected on the front side of the auxiliary bottom plate 4 through the semi-transparent plate 15 to fill the reflection area 17, as shown in FIG. Figure 1 The projection lamp 12 has the functions of automatic focusing and automatic tilt correction. The user sits or stands in front of the drawing board 7, holds the pen in the right hand and draws according to the projection information, and tries not to block the left projection light.

[0049] When storing or carrying the device after use, the light and shadow interactive system 1 is removed from the column 2, and the semi-transparent plate 15 is positioned at 0 degrees and placed separately; the column 2 is rotated inward 90 degrees through the vertical joint 3, and the auxiliary bottom plate 4 is rotated downward 180 degrees through the horizontal joint 5, and the main structure of the entire device is folded into a flat plate range of the size of the drawing board 7, such as Figure 4 shown.

[0050] Example 2

[0051] When teachers teach students remotely through drawing, the following steps are included: Fig.10 As shown:

[0052] (1) The teacher / student side puts away the semi-transparent board, and the camera locates the drawing board within the viewing range, identifies and marks the center coordinates of the four pressed balls (X n ,Y n ), and use the compressed sphere center coordinates with the same horizontal and vertical positions to correct the coordinates of the light and shadow interactive system and the projection lamp;

[0053] (2) The camera on the teacher / student side collects images within the coordinate plane of the drawing board, that is, the RGB data of each coordinate point, and the data matrix is ​​recorded as the background color data of the blank paper;

[0054] (3) The teacher draws on the drawing paper. The camera on the teacher's end scans the RGB data within the coordinate plane, stores the RGB data of the coordinate points where the data change exceeds the threshold, and transmits the coordinate data and RGB data to the network switch;

[0055] (4) The student opens the semi-transparent panel, and the network switch receives the coordinate data and RGB data from the teacher. The central processor controls the projection lamp to project the light and shadow pattern of the teacher's drawing board within the coordinate plane of the student's drawing board. The light and shadow pattern of the teacher's drawing board is also displayed on the auxiliary baseboard. The student draws according to the light and shadow pattern of the drawing board.

[0056] (5) After the student finishes drawing, the projection light on the student side is turned off, the semi-transparent board is folded up, the camera is started and the RGB data is scanned within the coordinate plane of the drawing board. The RGB data of the coordinate points where the data change exceeds the threshold is stored, and the coordinate data and RGB data are transmitted to the network switch;

[0057] (6) The network switch at the teacher's end receives the coordinate data and RGB data at the student's end, and the central processor controls the projection light to project the light and shadow pattern of the student's drawing board within the coordinate plane of the teacher's drawing board;

[0058] (7) The teacher replaces the blank drawing paper, watches the light and shadow pattern on the drawing board of the student, and annotates and guides on the new blank drawing paper with a pen; then the device on the teacher repeats step (3) and transmits the teacher's annotation and guidance data to the network switch;

[0059] (8) The student device repeats step (4) and projects the teacher's annotation guidance data onto the student's drawing board, superimposing the teacher's annotation guidance opinions on the student's drawing, and receiving the teacher's guidance in real time.

[0060] Example 3

[0061] The intelligent painting tutorial includes the following steps: Fig.11 As shown:

[0062] (1) The student puts away the semi-transparent board, and the camera locates the drawing board within the viewing range, identifies and marks the center coordinates of the four pressing balls (X n ,Y n ), and use the compressed sphere center coordinates with the same horizontal and vertical positions to correct the coordinates of the light and shadow interactive system and the projection lamp;

[0063] (2) The camera on the student end collects images within the coordinate plane of the drawing board, that is, the RGB data of each coordinate point, and the data matrix is ​​recorded as the background color data of the blank paper;

[0064] (3) The semi-transparent plate is opened, and the CPU sends the corrected coordinate information of the target image to the projector in groups of coordinate values ​​and RGB data according to the stroke sequence of the painting plan. The projector projects the light and shadow information onto the drawing board and displays it on the auxiliary base plate at the same time. Students copy and paint according to the light and shadow information pattern on the drawing board.

[0065] (4) After the student finishes drawing, the projection light on the student side is turned off, the semi-transparent board is folded up, the camera is started and the RGB data within the coordinate plane of the drawing board is scanned. The RGB data of the same coordinate points are compared with the target image data of the light and shadow interactive system. The image data of the continuous coordinate points within a certain range whose RGB data exceeds the threshold is recorded;

[0066] (5) The camera on the student end is turned off, and the projection light is turned on. The part of the image data recorded in step (4) that exceeds the threshold value is flashed at a certain visible frequency and projected onto the drawing board on the student end to prompt the student to make corrections;

[0067] (6) After the student modifies the painting, steps (4) and (5) are repeated until the degree of consistency between the student's work and the system's target image reaches a preset value, and the student completes a copy painting exercise.

[0068] Example 4

[0069] Taking cube painting as an example, a remote intelligent light and shadow interactive painting teaching method includes the following steps:

[0070] (1) First project the drawing target: Figure 6As shown, the projection lamp 12 projects a cube and its top surface and right side shadow image onto the drawing paper of the drawing board 7, and the student can observe the overall picture of the drawing target;

[0071] (2) Projection of the solid line: Figure 7 As shown, the projection lamp 12 projects the solid line part of the cube onto the drawing paper of the drawing board 7, and the student can copy and draw on the drawing paper according to the projected image;

[0072] (3) Projection of dotted line: Figure 8 As shown, the projection lamp 12 projects the dotted part of the cube onto the drawing paper of the drawing board 7, and the students can copy and draw on the drawing paper according to the projected image.

[0073] (4) Casting shadow: Fig. 9 As shown, the projection lamp 12 projects the shadow of the top surface and the shadow of the right side of the cube onto the drawing paper of the drawing board 7, and the students can copy and paint on the drawing paper according to the projected image.

[0074] (5) During the copying process: the projection lamp 12 and the camera 13 are switched at a high frequency, the camera 13 takes a picture of the image on the drawing paper or canvas and compares it with the target image of the light and shadow interactive system, and the projection lamp 12 flashes the parts with large comparison differences at a low frequency to prompt the user to modify the painting.

[0075] (6) Following the above steps, users can draw Figure 6 The target painting shown.

[0076] Similarly, this intelligent teaching mode is also suitable for color painting, such as oil painting and gouache painting.

Claims

1. A remote intelligent light and shadow interactive painting teaching device, characterized by: The invention comprises a light and shadow interactive system, a column, a vertical joint, an auxiliary base plate, a horizontal joint, a base plate and a drawing board; one side of the base plate and the auxiliary base plate are connected by a horizontal joint, and the base plate and the auxiliary base plate are in a plane when in use; the drawing board is placed on the base plate; there is a column on the other side of the auxiliary base plate, and the column and the auxiliary base plate are connected by a vertical joint, and the vertical joint has a limiting function, which limits the column to the vertical auxiliary base plate; the light and shadow interactive system comprises a light and shadow interactive controller, a card holder, a projection lamp and a camera; the light and shadow interactive system is plugged into the top of the column through the card holder, and the light and shadow interactive controller One side is fixedly connected to the card holder, and the other side of the light and shadow interactive controller is equipped with a projection lamp and a camera and faces the direction of the drawing board; it also includes a clamping ball and a spring joint; spring joints are installed on the four corners of the front of the drawing board, and a clamping ball is fixed on the top of the spring joint; it also includes a semi-transparent plate, which is installed on the other side of the top of the light and shadow interactive controller through a positioning joint, and the semi-transparent plate can be positioned at any position between 0-270°, and the semi-transparent plate plays the role of transmitting and reflecting light; the light and shadow interactive controller has a built-in central processing unit, a network switch, a voice system and a data interface.

2. An application of the remote intelligent light and shadow interactive painting teaching device according to claim 1, characterized in that: Applicable to teachers' remote drawing guidance or intelligent drawing guidance.

3. The use of the painting teaching device according to claim 2, characterized in that: When the teacher is teaching remote painting, both the teacher and the student use the remote intelligent light and shadow interactive teaching device. The teacher draws on the drawing paper, and the camera captures the image information on the drawing paper of the teacher's device in real time. The semi-transparent plate of the teacher's device is positioned at 0 degrees, and the camera collects the image information of the collection area; then the network switch is connected to the student's device to transmit the image information to the student's device; The semi-transparent plate of the student-end device is positioned at a suitable angle so that part of the image information transmitted from the teacher-end is reflected on the front of the auxiliary base plate for reference, and part of the light is transmitted through the semi-transparent plate to the drawing board of the student-end device for copying; at the same time, the teacher guides the students to learn painting through the voice system; when the semi-transparent plate of the student-end device is folded, the camera can feed back real-time image information of the student's painting to the teacher-end, projected on the drawing board of the teacher's end, for the teacher to use for online guidance.

4. The use of the painting teaching device according to claim 3, characterized in that: The teacher's remote painting teaching includes the following steps: (1) The teacher / student side puts away the semi-transparent board, and the camera locates the drawing board within the viewing range, identifies and marks the center coordinates of the four pressed balls (X n ,Y n ), and use the compressed sphere center coordinates with the same horizontal and vertical positions to correct the coordinates of the light and shadow interactive system and the projection lamp; (2) The camera on the teacher / student side collects images within the coordinate plane of the drawing board, that is, the RGB data of each coordinate point, and the data matrix is ​​recorded as the background color data of the blank paper; (3) The teacher draws on the drawing paper. The camera on the teacher's end scans the RGB data within the coordinate plane, stores the RGB data of the coordinate points where the data change exceeds the threshold, and transmits the coordinate data and RGB data to the network switch; (4) The student opens the semi-transparent panel, and the network switch receives the coordinate data and RGB data from the teacher. The central processor controls the projection lamp to project the light and shadow pattern of the teacher's drawing board within the coordinate plane of the student's drawing board. The light and shadow pattern of the teacher's drawing board is also displayed on the auxiliary baseboard. The student draws according to the light and shadow pattern of the drawing board. (5) After the student finishes drawing, the projection light on the student side is turned off, the semi-transparent board is folded up, the camera is started and the RGB data is scanned within the coordinate plane of the drawing board. The RGB data of the coordinate points where the data change exceeds the threshold is stored, and the coordinate data and RGB data are transmitted to the network switch; (6) The network switch at the teacher's end receives the coordinate data and RGB data at the student's end, and the central processor controls the projection light to project the light and shadow pattern of the student's drawing board within the coordinate plane of the teacher's drawing board; (7) The teacher replaces the blank drawing paper, watches the light and shadow pattern on the drawing board of the student, and annotates and guides on the new blank drawing paper with a pen; then the device on the teacher repeats step (3) and transmits the teacher's annotation and guidance data to the network switch; (8) The student device repeats step (4) and projects the teacher's annotation guidance data onto the student's drawing board, superimposing the teacher's annotation guidance opinions on the student's drawing, and receiving the teacher's guidance in real time.

5. The use of the painting teaching device according to claim 2, characterized in that: During the intelligent painting teaching, the teacher prepares the target image into a teaching program in advance, stores it or remotely downloads it to the light and shadow interactive system of the student-end device, and the projection lamp projects lines or colors in sequence according to the standard painting steps. The semi-transparent plate is positioned at a suitable angle so that part of the light of the same image is reflected on the front of the auxiliary base plate for reference, and part of the light is transmitted through the semi-transparent plate to the drawing board of the student-end device for copying. After the student's work is completed, the semi-transparent plate is folded up, and the camera captures the image on the student's drawing paper in real time, and the image on the drawing paper is compared with the target image in the light and shadow interactive system for contour and color. The parts with lower compliance are projected on the drawing paper with a projection lamp as a flashing prompt.

6. The use of the painting teaching device according to claim 5, characterized in that: The intelligent painting tutorial includes the following steps: (1) The student puts away the semi-transparent board, and the camera locates the drawing board within the viewing range, identifies and marks the center coordinates of the four pressing balls (X n ,Y n ), and use the compressed sphere center coordinates with the same horizontal and vertical positions to correct the coordinates of the light and shadow interactive system and the projection lamp; (2) The camera on the student end collects images within the coordinate plane of the drawing board, that is, the RGB data of each coordinate point, and the data matrix is ​​recorded as the background color data of the blank paper; (3) The semi-transparent plate is opened, and the CPU sends the corrected coordinate information of the target image to the projector in groups of coordinate values ​​and RGB data according to the stroke sequence of the painting plan. The projector projects the light and shadow information onto the drawing board and displays it on the auxiliary base plate at the same time. Students copy and paint according to the light and shadow information pattern on the drawing board. (4) After the student finishes drawing, the projection light on the student side is turned off, the semi-transparent board is folded up, the camera is started and the RGB data within the coordinate plane of the drawing board is scanned. The RGB data of the same coordinate points are compared with the target image data of the light and shadow interactive system. The image data of the continuous coordinate points within a certain range whose RGB data exceeds the threshold is recorded; (5) The camera on the student end is turned off, and the projection light is turned on. The part of the image data recorded in step (4) that exceeds the threshold value is flashed at a certain visible frequency and projected onto the drawing board on the student end to prompt the student to make corrections; (6) After the student modifies the painting, steps (4) and (5) are repeated until the degree of consistency between the student's work and the system's target image reaches a preset value, and the student completes a copy painting exercise.

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