A method and device for inputting writing trajectories

Abstract

The present invention discloses a writing trajectory recording method and device. A switch button at the upper end of a camera body is activated, the camera is in an on state, the camera captures an image, writing image recognition is performed on the captured image, the optical image is converted into an electronic signal by an image sensor, the switch button at the upper end of the recording body is activated, the writing object uses the tip of a writing pen to contact the upper end of the recording body to write, an ultrasonic transmitting sensor in the writing pen transmits the sound wave writing signal to a first ultrasonic receiving sensor and a second ultrasonic receiving sensor, the first ultrasonic receiving sensor and the second ultrasonic receiving sensor convert and analyze the received sound wave writing signal into an electrical signal, the electrical signal received by the first ultrasonic receiving sensor and the second ultrasonic receiving sensor in the recording body is processed by an information processor electrically connected to the recording body, and the moving trajectory of the writing pen is calculated.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic technology, and particularly relates to a method and device for inputting writing trajectories. Background Art

[0002] A handwriting input device is a device that drives an ultrasonic transmitter to emit ultrasonic waves through a built-in control circuit board, receives the ultrasonic waves by an ultrasonic receiver, and calculates the movement trajectory of a writing pen through an algorithm in a receiving chip to realize the automatic electronicization of writing content. Compared with an electronic notepad, it is more acceptable to users. However, existing handwriting input devices have certain drawbacks when in use. They cannot well store the writing pen, and the writing pen is prone to slipping out and being damaged, requiring frequent replacement of the writing pen, which increases the usage cost. Since the surface of this device is smooth, it is prone to slipping from the hand during use, which has a certain impact during actual use. Printed books only have text and pictures and lack the ability to play multimedia (such as playing sound). The emergence of the point reading technology has solved this problem. Users only need to press the tip of a special point reading pen on a special position of a book that supports the point reading function, and the point reading pen can make a sound and play the hidden content in this area in the form of audio. However, this method requires the book to be specially made and needs to be processed by professional equipment after being printed before it can be recognized by the point reading pen. Summary of the Invention

[0003] The purpose of the present invention is to solve the drawbacks existing in the prior art, and to provide a method and device for inputting writing trajectories.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A method for inputting writing trajectories includes the following steps:

[0006] S1: Start the switch button at the upper end of the camera body. The camera is in an open state. The camera captures an image, performs handwriting image recognition on the captured image, and converts the optical image into an electrical signal through an image sensor.

[0007] S2: Start the switch button at the upper end of the input body. The writing object uses the tip of the writing pen to touch the upper end of the input body for writing. The ultrasonic emission sensor in the writing pen transmits the acoustic writing signal to the first ultrasonic receiving sensor and the second ultrasonic receiving sensor. The first ultrasonic receiving sensor and the second ultrasonic receiving sensor convert and analyze the received acoustic writing signal into an electrical signal.

[0008] S3: The electrical signals received by the first ultrasonic receiving sensor and the second ultrasonic receiving sensor in the input body are processed by an information processor electrically connected in the input body to calculate the movement trajectory of the writing pen.

[0009] Preferably, the camera captures an image, and the image sensor converts the writing image of the writing object during pen tip writing into an electrical signal, ensuring that the writing image determines the page turning information of the writing object.

[0010] Preferably, the camera can scan a QR code, and the QR code is recognized by the image sensor to enable communication connection between the QR code, the input body, and the electronic device.

[0011] Preferably, the interior of the writing pen includes an information storage, and the information storage stores calibration parameter information, which includes offset distance information and offset direction information. The calibration parameter information represents the position deviation between the position of the first area and the position of the pen tip. Based on the calibration parameter information and the position information of the first area, the position information of the pen tip is determined. The ultrasonic signal transmitting sensor is located in the first area of the writing pen to obtain the first distance, which is the distance between the ultrasonic signal transmitting sensor and the pen tip. The ultrasonic signal transmitting sensor is fixedly arranged on the writing pen.

[0012] A writing trajectory input device includes a storage shell. Both end side walls of the storage shell are provided with grooves, and guide rails are fixed to the inner walls of the grooves by rivets. A sliding plate is slidably connected to the side wall of the guide rail, and one end of the sliding plate extends and is fixed inside the placement plate. An installation groove is provided in the side wall of the storage shell close to the placement plate, and a telescopic device is connected by screw buckles in the installation groove. One end of the telescopic device abuts against the side wall of the input body. A groove is provided in one end side wall of the input body, and a limiting rod is fixedly connected by screw buckles in the groove. One end of the limiting rod extends into the interior of the imaging body. A groove is provided in the side wall of the imaging body, and a circular slide rail is fixed to the inner wall of the groove by rivets. The limiting rod is rotatably connected to the side wall of the circular slide rail. A telescopic rod is fixedly clamped to the side wall of the input body far from the limiting rod, and one end of the telescopic rod is movably clamped inside the imaging body. A connection shell is fixed to the side wall of the input body close to the writing pen by screws.

[0013] Preferably, a USB interface is provided in the other end side wall of the input body, and a point reading board is arranged at the upper end of the input body. A through hole is provided in the upper end side wall of the input body close to the point reading board, and a writing pen is electrically connected to the inner wall of the through hole. The writing pen is placed inside the connection shell. An ultrasonic transmitting sensor is arranged at a position of the writing pen close to the pen tip. A first ultrasonic receiving sensor, a second ultrasonic receiving sensor, and an information processor are arranged inside the input body close to the writing end. The ultrasonic transmitting sensor is selected from any one of a piezoelectric film ultrasonic sensor, a piezoelectric ceramic ultrasonic sensor, an electrostatic transducer ultrasonic sensor, and a microelectromechanical ultrasonic sensor.

[0014] Preferably, a track is fixed to the bottom end side wall of the storage shell close to the guide rail by rivets, and a placement plate is slidably connected to the side wall of the track.

[0015] Preferably, a camera is provided on the same side wall as the circular sliding rail, and the interior of the imaging body includes an image sensor. One end of the imaging body abuts against the side wall of the connection shell.

[0016] Preferably, two grooves are formed in one end side wall of the storage shell, and a connecting rod is fixedly clamped inside the grooves. A sliding rod is slidably connected inside the connecting rod. One end of the sliding rod extends into the inside of the sliding groove. The sliding groove is formed in the side wall of the baffle. One end side wall of the baffle is connected with a rotating rod through a threaded rivet. A rotating plate is sleeved on the outer wall of the rotating rod. One end side wall of the rotating plate is clamped and connected with a magnet block. One end of the magnet block is magnetically connected with a magnet block, and the magnet block is fixedly clamped inside the storage shell.

[0017] Preferably, the telescopic device includes a fixed rod, and a spring is placed inside the fixed rod. One end of the spring is welded with a push rod. One end of the push rod is fixedly clamped inside the top plate. The top plate abuts against the side wall of the input body. The fixed rod is fixed in the installation groove formed in the side wall of the storage shell through a screw buckle.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. In the present invention, through the settings of the storage shell, the input body, the placement plate, the sliding plate, the rotating plate, the baffle, the guide rail, the imaging body, the telescopic device and the connection shell, the baffle and the rotating plate can be manually opened under the connection of the sliding rod, and the input device can be moved out of the storage shell. When the input device is stored in the storage shell, the telescopic device can reduce the vibration generated when carrying the input device in the storage shell under the elastic action of the spring, playing a role in protecting the input device. At the same time, when the input device stops being used, storing it in the storage shell can play a role in dust-proof protection for the input device, and also improve the convenience and comfort of carrying the input device.

[0020] 2. In the present invention, through the settings of the imaging body, the input body, the writing pen and the camera, the tip of the writing pen contacts the upper end of the input body, and the ultrasonic emission sensor in the writing pen transmits the acoustic writing signal to the first ultrasonic receiving sensor and the second ultrasonic receiving sensor. The information processor electrically connected inside the input body receives and processes the electrical signal, calculates the moving trajectory of the tip of the writing pen, and completes the input of the writing trajectory. The writing pen can be connected to external devices through the camera, or the USB interface provided at the upper end of the input body can be used to achieve wired connection with mobile phones and computers, which can play a role in transmitting between pictures and trajectory information.

[0021] 3. In the present invention, through the settings of the imaging body, the input body, the writing pen, and the camera, the deviation between the handwriting obtained by positioning the ultrasonic emission sensor and the actual position of the pen tip can be eliminated, so as to achieve precise positioning of the handwriting of the writing pen using the ultrasonic positioning principle. The camera captures the writing image of the writing object when the pen tip is writing, and the writing image is processed by the image sensor to convert the image signal into an electrical signal, and the page turning information of the writing object is determined through the processing of the information processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic side view structure diagram of a writing trajectory input method and device proposed by the present invention;

[0023] Figure 2 FIG. is a schematic front view structure diagram of a writing trajectory input method and device proposed by the present invention;

[0024] Figure 3 FIG. is a schematic partial top view structure diagram of a writing trajectory input method and device proposed by the present invention;

[0025] Figure 4 FIG. is a schematic partial front view structure diagram of a writing trajectory input method and device proposed by the present invention;

[0026] Figure 5 FIG. is a schematic partial enlarged structure diagram of a writing trajectory input method and device proposed by the present invention;

[0027] Figure 6 FIG. is a schematic structural module diagram of a writing trajectory input method and device proposed by the present invention.

[0028] In the figure: 1 storage case, 2 input body, 21 USB interface, 22 telescopic rod, 23 writing pen, 24 dot reading board, 3 placing board, 4 sliding board, 5 rotating board, 6 rotating rod, 7 baffle, 8 sliding groove, 9 sliding rod, 10 connecting rod, 11 guide rail, 12 telescopic device, 121 top plate, 122 fixed rod, 123 spring, 124 push rod, 13 imaging body, 131 camera, 14 circular slide rail, 15 limiting rod, 16 connecting shell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0030] Example 1: Refer to Figure 1-6, A writing trajectory input method and device. When the writing trajectory input device needs to be used, first open the storage case 1 where the input device is placed, and manually pull the baffle 7 horizontally. Under the connection of the sliding rod 9, the baffle 7 and the rotating plate 5 are simultaneously pulled, driving the sliding rod 9 to move out of the connecting rod 10 by pulling the baffle 7, gradually moving the baffle 7 and the rotating plate 5 away from the storage case 1. When the length of the sliding rod 9 is pulled to the limit, stop moving the baffle 7 horizontally, and start pulling the baffle 7 upward. The baffle 7 moves along the sliding rod 9 under the connection of the sliding groove 8, and the rotating plate 5 moves simultaneously. When the top of the sliding groove 8 contacts the sliding rod 9, stop pulling the baffle 7. Manually apply force to rotate the rotating plate 5 around the rotating rod 6, so that the rotating plate 5 rotates from the vertical direction to the horizontal direction. At the same time, the movement of the rotating plate 5 causes the magnet blocks inside it to separate from the magnet blocks on the storage case 1 one by one. Due to the frictional connection between the rotating plate 5 and the rotating rod 6, the stability of the rotating plate 5 after stopping rotation can be ensured, and the opening of the storage case 1 is completed. Then, the placement plate 3 can be manually pulled, so that the placement plate 3 drives the fixedly connected sliding plate 4 to move along the guide rail 11, and the input device placed inside it is moved out of the storage case 1 together. When the placement plate 3 drives the input device to move out of the storage case 1, it will move under the horizontal guiding action of the fixedly arranged top plate 121. When the input device is stored in the storage case 1, since the top plate 121 abuts against the side wall of the input device, under the elastic action of the spring 123, the vibration generated when carrying the input device in the storage case 1 can be reduced, which plays a protective role for the input device. At the same time, when the input device stops being used, storing it in the storage case 1 can play a role in dust-proof protection for the input device, and also improves the convenience and comfort of carrying the input device.

[0031] Example 1: Refer to Figure 1-6, A method and device for inputting a writing trajectory. After the input device is removed from the storage case 1, the input device can be used. When the input device is in use, first, the length of the telescopic rod 22 is reduced, so that one end of the telescopic rod 22 is taken out from the inside of the imaging body 13. Then, the imaging body 13 drives the circular slide rail 14 to rotate around the fixedly connected limit rod 15, so that the imaging body 13 rotates from a position parallel to the input body 2 to a vertical position around the circular slide rail 14 under the connection of the limit rod 15, making the imaging body 13 perpendicular to the input body 2. Then, the switch button at the upper end of the imaging body 13 is activated to turn on the imaging body 13. Then, the switch button at the upper end of the input body 2 is activated to turn on the input body 2. After that, the writing object takes out the writing pen 23 from the connection shell 16, holds the writing pen 23, and makes the tip of the writing pen 23 touch the upper end of the input body 2, making contact with the input body 2. The ultrasonic wave emission sensor in the writing pen 23 transmits the acoustic wave writing signal to the first ultrasonic wave receiving sensor and the second ultrasonic wave receiving sensor. The first ultrasonic wave receiving sensor and the second ultrasonic wave receiving sensor convert and analyze the received acoustic wave writing signal into an electrical signal. The electrical signal received by the input body 2 through the first ultrasonic wave receiving sensor and the second ultrasonic wave receiving sensor is received and processed by the information processor electrically connected in the input body 2, and the moving trajectory of the tip of the writing pen 23 is calculated to complete the input of the writing trajectory. (During the use of the input device, it is powered by the battery installed in the input body 2).

[0032] Embodiment 1: Refer to Figure 1-6 , A method and device for inputting a writing trajectory. When the camera 131 is in use, it can scan and identify the two-dimensional code in the external environment. The scanned and identified image can be processed by the image sensor to convert the image signal into an electrical signal, which is transmitted to the signal processor through the electrical signal. Through the signal processor, the identified external information can be displayed on the input device, enabling the writing pen to be connected to external devices through the camera 131, or using the USB interface 21 provided at the upper end of the input body 2 to achieve a wired connection with mobile phones and computers, which can play a role in transmitting between pictures and trajectory information.

[0033] When positioning the handwriting trajectory of the pen tip and determining whether the pen flips a page, first ensure that the camera 131 is in a vertical state, perpendicular to the input body 2. Then, through the data memory in the pen, the information memory stores calibration parameter information, which includes offset distance information and offset direction information. The calibration parameter information represents the position deviation between the position of the first area and the position of the pen tip. Based on the calibration parameter information and the position information of the first area, the position information of the pen tip is determined. The ultrasonic signal transmitting sensor is located in the first area of the pen, and the first distance is obtained. The first distance is the distance between the ultrasonic signal transmitting sensor and the pen tip. The ultrasonic signal transmitting sensor is fixedly arranged on the pen, and the first distance is stored as known data on the pen, which can eliminate the deviation between the handwriting obtained by positioning the ultrasonic transmitting sensor and the actual position of the pen tip, and achieve precise positioning of the handwriting of the pen using the ultrasonic positioning principle. The camera 131 captures the handwriting image of the writing object when the pen tip writes, and the handwriting image is converted into an electrical signal through the processing of the image sensor. The page turning information of the writing object is determined through the processing of the information processor.

[0034] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A writing trajectory input device, characterized in that: it has a storage case (1) and a telescopic rod (22). One end of the telescopic rod (22) can be taken out from the inside of the camera body (13), and the camera body (13) can drive the circular slide rail (14) to rotate around the fixed connecting limit rod (15); On one end side wall of the storage case (1), two grooves are provided, and a connecting rod (10) is fixedly clamped inside the grooves. A sliding rod (9) is slidably connected inside the connecting rod (10). One end of the sliding rod (9) extends into the inside of the sliding groove (8). The sliding groove (8) is provided on the side wall of the baffle (7). One end side wall of the baffle (7) is connected with a rotating rod (6) through a threaded rivet. A rotating plate (5) is sleeved on the outer wall of the rotating rod (6); It also includes an input body (2). On one end side wall of the input body (2), a groove is provided, and a limit rod (15) is fixedly connected inside the groove through a screw buckle. One end of the limit rod (15) extends into the inside of the camera body (13). A groove is provided on the side wall of the camera body (13), and a circular slide rail (14) is fixed inside the groove through a rivet. The limit rod (15) is rotatably connected to the side wall of the circular slide rail (14). On the side wall of the input body (2) away from the limit rod (15), a telescopic rod (22) is fixedly clamped. One end of the telescopic rod (22) is movably clamped inside the camera body (13). On the side wall of the input body (2) close to the writing pen (23), a connecting shell (16) is fixed through a screw; A USB interface (21) is provided on the other end side wall of the input body (2), and a point reading board (24) is arranged on the upper end of the input body (2). A through hole is provided on the upper end side wall of the input body (2) close to the point reading board (24). The inner wall of the through hole is electrically connected to the writing pen (23) through conductivity. The writing pen (23) is placed inside the connecting shell (16). An ultrasonic emission sensor is arranged at a position of the writing pen (23) close to the pen tip. A first ultrasonic reception sensor, a second ultrasonic reception sensor and an information processor are arranged inside the input body (2) close to the writing end. The ultrasonic emission sensor is selected from any one of a piezoelectric film ultrasonic sensor, a piezoelectric ceramic ultrasonic sensor, an electrostatic transducer ultrasonic sensor, and a microelectromechanical (MEMS) ultrasonic sensor.

2. A writing trajectory input device according to claim 1, characterized in that, on the bottom side wall of the storage case (1) close to the guide rail (11), a track is fixed through a rivet, and a placement plate (3) is slidably connected to the side wall of the track.

3. A writing trajectory input device according to claim 1, characterized in that , a camera (131) is provided on the same side wall of the camera body (13) where the circular slide rail (14) is installed, and the inside of the camera body (13) includes an image sensor. One end of the camera body (13) abuts against the side wall of the connecting shell (16).

4. A writing trajectory input method of a writing trajectory input device according to claim 1, including the following steps: S1: After the writing trajectory input device is removed from the storage case (1), shorten the length of the telescopic rod (22) so that one end of the telescopic rod (22) is taken out from the inside of the imaging body (13), and then drive the imaging body (13) and the circular slide rail (14) to rotate around the fixedly connected limit rod (15) so that the imaging body (13) is parallel to the input body (2); S2: Start the switch button at the upper end of the imaging body (13) to ensure that the camera (131) is in a vertical state, which is perpendicular to the input body (2). The camera (131) is in an open state. The camera (131) captures an image, performs writing image recognition on the captured image, and converts the optical image into an electrical signal through an image sensor; S3: Start the switch button at the upper end of the input body (2). The writing object uses the tip of the writing pen (23) to contact the upper end of the input body (2) for writing. The ultrasonic emission sensor in the writing pen (23) transmits the acoustic wave writing signal to the first ultrasonic receiving sensor and the second ultrasonic receiving sensor. The first ultrasonic receiving sensor and the second ultrasonic receiving sensor convert and analyze the received acoustic wave writing signal into an electrical signal; S4: The electrical signals received by the first ultrasonic receiving sensor and the second ultrasonic receiving sensor in the input body (2) are processed by the information processor electrically connected in the input body (2) to calculate the movement trajectory of the writing pen (23).

5. The writing trajectory input method according to claim 4, wherein, the camera (131) scans a QR code and recognizes the QR code through an image sensor to establish a communication connection between the QR code, the input body (2), and the electronic device.

6. The writing trajectory input method according to claim 4, wherein, the interior of the writing pen (23) includes an information memory that stores calibration parameter information. The calibration parameter information includes offset distance information and offset direction information. The calibration parameter information represents the position deviation between the position of the first area and the position of the pen tip. Based on the calibration parameter information and the position information of the first area, the position information of the pen tip is determined. The ultrasonic signal emission sensor is located in the first area of the writing pen, and a first distance is obtained. The first distance is the distance between the ultrasonic signal emission sensor and the pen tip. The ultrasonic signal emission sensor is fixedly arranged on the writing pen.

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