CN115376134A - Dot matrix pen system and decoding method - Google Patents
Dot matrix pen system and decoding method Download PDFInfo
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- CN115376134A CN115376134A CN202211322002.3A CN202211322002A CN115376134A CN 115376134 A CN115376134 A CN 115376134A CN 202211322002 A CN202211322002 A CN 202211322002A CN 115376134 A CN115376134 A CN 115376134A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/14—Image acquisition
- G06V30/142—Image acquisition using hand-held instruments; Constructional details of the instruments
- G06V30/1423—Image acquisition using hand-held instruments; Constructional details of the instruments the instrument generating sequences of position coordinates corresponding to handwriting
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/32—Digital ink
- G06V30/333—Preprocessing; Feature extraction
Abstract
The invention relates to a dot matrix pen system and a decoding method, belonging to the technical field of dot matrix pens, wherein the dot matrix pen system comprises: the dot matrix pen is in wireless communication connection with the server and used for reading the dot code image, generating a data frame related to dot code coordinates of the dot code image and transmitting the data frame to the server; and the server is in wireless communication connection with the terminal equipment and is used for decoding the data frame to obtain decoding information and transmitting the decoding information to the terminal equipment for displaying. The invention not only can greatly reduce the cost and the power consumption of the dot matrix pen, but also can realize the integration of the dot matrix pen point reading function and the track input by transmitting the data frame to the server for decoding.
Description
Technical Field
The present invention relates to the field of dot matrix pen technologies, and in particular, to a dot matrix pen system, a decoding method, an electronic device, and a computer-readable storage medium.
Background
The existing dot-matrix pen collects the point codes of the micro-graph laid on paper in advance through a camera, and restores the handwriting by extracting the coordinate information of the code points through a certain algorithm. The point code of the micro-graph printed on the paper contains information such as coordinates, page numbers and the like, is different from the contents such as characters, pictures and the like on the paper, then a pen with a camera is used for clicking different positions on the paper, and the point code of the micro-graph is read and analyzed, so that the mark information corresponding to the contents such as the related characters, pictures and the like can be obtained. The dot matrix pen generally comprises an infrared light emitting tube, a miniature camera, an image processing unit, a communication unit and the like. Dot matrix pens are used in two general applications, one for reading (commonly referred to as a point-reading pen) and one for writing trace recording by the pen.
The dot matrix pen (hereinafter referred to as dot matrix pen) for recording the writing track of the pen needs to continuously and quickly photograph the dot codes of the micrographs at the pen point position, and needs to quickly process the image of the dot codes of the micrographs, and then decodes the dot codes to obtain the relevant information of the position of the pen point, including the information of page numbers, coordinates and the like.
The existing dot matrix pen needs to embed an image processor in the pen to realize processing and decoding of dot code images, has higher processing speed requirement, and generally adopts a processor of hundreds of megahertz, thereby increasing the cost and power consumption of the pen.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a dot matrix pen system and a decoding method, so as to solve the problem of high cost and power consumption of the existing dot matrix pen.
A dot matrix pen system comprising:
the dot matrix pen is in wireless communication connection with the server and is used for reading the dot code image, generating a data frame related to the dot code coordinates of the dot code image and transmitting the data frame to the server;
and the server is in wireless communication connection with the terminal equipment and is used for decoding the data frame to obtain decoding information and transmitting the decoding information to the terminal equipment for display.
Preferably, the dot matrix pen includes:
the processor is respectively connected with the microswitch and the point code coordinate extraction unit and is used for sending an instruction to enable the point code coordinate extraction unit to process the acquired point code image to obtain a coordinate of the point code when the pen core is contacted with the microswitch;
and the camera is connected with the point code coordinate extraction unit and is used for acquiring a point code image.
Preferably, the dot matrix pen further comprises:
and the wireless transmission unit is connected with the processor and is used for transmitting the data frame to the server.
The invention also provides a decoding method, which comprises the following steps:
step 1: acquiring a point code image;
step 2: preprocessing the point code image to obtain a preprocessed point code image;
and 3, step 3: extracting coordinates of the preprocessed point code image to obtain point code coordinates;
and 4, step 4: packing the dot code coordinates, the dot matrix pen ID numbers and the operation mode information codes into data frames;
and 5: and analyzing the data frame by using a server to obtain decoding information.
Preferably, the step 5: analyzing the data frame by using a server to obtain decoding information, wherein the method comprises the following steps:
step 5.1: reading a data frame header and adding the data frame to a decoding queue corresponding to the dot matrix pen ID number;
step 5.2: and decoding the data frame by adopting the decoding queue to obtain decoding information.
Preferably, in step 5.2: after the decoding queue is adopted to decode the data frame to obtain decoding information, the method further comprises the following steps:
step 5.3: when the analyzed operation mode information code is a read mode, the server sends the decoding information to the terminal equipment for displaying;
step 5.4: and when the analyzed operation mode information code is a writing mode, the server stores the decoding information in a storage space corresponding to the ID number of the dot matrix pen for storage.
The invention also provides an electronic device comprising a bus, a transceiver, a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the transceiver, the memory and the processor are connected via the bus, and the computer program realizes the steps of the decoding method when being executed by the processor.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of a decoding method as described above.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention relates to a dot matrix pen system, a decoding method, an electronic device and a computer readable storage medium, wherein the dot matrix pen system comprises: the dot matrix pen is in wireless communication connection with the server and used for reading the dot code image and transmitting the dot code image to the server; and the server is in wireless communication connection with the terminal equipment and is used for decoding the point code image to obtain decoding information and transmitting the decoding information to the terminal equipment for displaying. The invention can greatly reduce the cost and the power consumption of the dot matrix pen by transmitting the data frame to the server for decoding.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a dot matrix pen system according to the present invention;
FIG. 2 is a schematic diagram of a dot matrix pen according to the present invention;
FIG. 3 is a flowchart of the operation of the dot matrix pen tip provided by the present invention;
fig. 4 is a decoding flowchart of the server according to the present invention.
Description of the symbols:
1. a server; 2. a terminal device; 3. and (4) a dot matrix pen.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention aims to provide a dot matrix pen system and a decoding method, and aims to solve the problem that the existing dot matrix pen is high in cost.
Referring to fig. 1, a dot matrix pen system is composed of a dot matrix pen 3, a server 1 and a terminal device 2, which are connected via a wireless network. The server 1 may be located at the cloud or edge. The dot matrix pens 3 read the dot code images, digitize the dot code images, generate an ID number + operation mode + dot code coordinate frame, and wirelessly transmit the ID number + operation mode + dot code coordinate frame to the server 1 for decoding. The coordinate extraction of the point code image is to identify the position of the point code in the point code image and generate a digital frame consisting of the coordinates of each point code.
Specifically, the dot matrix pen 3 is in wireless communication connection with the server 1, and is configured to read a dot code image, generate a data frame related to a dot code coordinate of the dot code image, and transmit the data frame to the server 1; and the server 1 is in wireless communication connection with the terminal equipment 2 and is used for decoding the data frame to obtain decoding information and transmitting the decoding information to the terminal equipment 2 for displaying.
Referring to fig. 2, the dot matrix pen 3 of the present invention includes: the system comprises a processor, a microswitch, a point code coordinate extraction unit, a wireless transmission unit, a camera and a UI unit.
The processor is respectively connected with the microswitch and the point code coordinate extraction unit and is used for sending an instruction to enable the point code coordinate extraction unit to process the acquired point code image to obtain a coordinate of the point code when the pen core is contacted with the microswitch; and the camera is connected with the point code coordinate extraction unit and is used for collecting the point code image. And the wireless transmission unit is connected with the processor and is used for transmitting the data frame to the server 1. Furthermore, the dot matrix pen 3 of the invention is also provided with a key, a lens and an infrared LED thereof. The key is used for controlling the opening or closing of the processor. And the infrared LED is used for supplementing light to the camera when the light is too dark. The UI unit refers to a User Interface unit, a User Interface, a display, a loudspeaker, a key and other human-computer interaction interfaces.
The invention also provides a decoding method, which comprises the following steps:
step 1: acquiring a point code image;
and 2, step: preprocessing the point code image to obtain a preprocessed point code image;
referring to fig. 3, the dot code image preprocessing process of the present invention is completed by using a dot matrix pen, and the working flow thereof is as follows:
1. and (4) image preprocessing, wherein the preprocessing adopts smooth filtering on the image to remove the influence of random noise.
2. The invention adopts an edge detection method to find out the outline of each point code, and then calculates the gravity center of each outline as the coordinate value of the point code. The coordinate values of the point codes are obtained by the above method, but for example, the point codes in the point code image are generally circular dots or square shapes and have regular symmetry, so that the coordinates of the point codes can be represented by the average value of the maximum and minimum values of the x and y coordinates occupied by the outline.
3. And packaging the data frame, adding the ID number of the dot matrix pen, the operation mode information code and the like into the data frame by the processor to generate an information packet header, generating a point code coordinate set together with the information packet header to form a frame data frame, and sending the frame data frame through the wireless communication module.
The above three steps are completed by a chip on the pen in the dot matrix pen system of the invention, there are two implementation methods, firstly, the implementation is realized by special hardware, for example, a special chip or a logic programmable chip is adopted; another approach is to use an algorithm implemented in the processor. The implementation method is relatively simple, and does not occupy too much system resources, so the hardware in the pen is relatively simple, fig. 2 is an embodiment of the dot matrix pen of the present invention, and the dot code coordinate extraction unit is used to implement the above two steps. The method aims to acquire coordinate values of each point code of an image frame to form a coordinate value set. The size of the image frame adopted by the invention can be as low as 25K bytes, the number of the point codes of each frame is not more than 80, the set of the generated coordinate values is not more than 160 bytes after passing through the point code digitizing unit, wherein the x and y coordinates are respectively represented by one byte. The pen ID number may be in a 3 byte, one byte pattern. A total of 164 bytes, and other data sets, such as no operation mode, may be available, and the number of coordinates of the point codes may vary according to the number of point codes.
The Mode byte can be used for representing the using Mode of the dot matrix pen of a user, for example, a reading Mode and a writing Mode can be provided, if the reading Mode is adopted, the server returns the pronunciation, the explanation and the like of words or sentences at the pen point position, the returned voice or characters can be played back on a terminal, and the terminal can be a mobile phone, a computer or integrated on the pen itself and is set according to requirements. If the writing mode is adopted, the writing track of the user is stored in the storage area corresponding to the user ID number (namely the ID number of the lattice pen), and the subsequent processing is waited, such as classification summary or evaluation analysis and the like.
It should be noted that the data frames generated in the embodiment of the present invention are as follows:
| ID | Mode | set of point code coordinates |
And step 3: extracting coordinates of the preprocessed point code image to obtain point code coordinates;
and 4, step 4: packing the dot code coordinates, the dot matrix pen ID number and the operation mode information code into a data frame;
and 5: and analyzing the data frame by using a server to obtain decoding information.
Further, the step 5 comprises:
step 5.1: reading a data frame header and adding the data frame to a decoding queue corresponding to the dot matrix pen ID number;
step 5.2: and decoding the data frame by adopting the decoding queue to obtain decoding information.
In the embodiment of the present invention, after step 5.2, the method further includes:
step 5.3: when the analyzed operation mode information code is a read mode, the server sends the decoding information to the terminal equipment for displaying;
step 5.4: and when the analyzed operation mode information code is a writing mode, the server stores the decoding information in a storage space corresponding to the ID number of the dot matrix pen for storage.
The decoding process of the present invention is further described below with reference to specific embodiments:
after receiving the data frame, the server recovers the original data of the data frame, firstly searches a decoding thread corresponding to the ID number, if the original data of the data frame is not found, a new decoding thread is created for decoding the point code frame corresponding to the ID number, and if the decoding thread corresponding to the ID number is found, the data frame is sent to a decoding queue. The decoding process is shown in fig. 4. Reading the header of the data frame is to obtain the ID number of the data frame and add the data frame to the decoding queue corresponding to the ID number. The lattice code includes positioning code and information code, and the positioning code is used to define the position of the information code, so that the positioning code is first identified during decoding. The positioning codes are generally arranged in a straight line or have a special shape, such as a cross shape, for easy identification. In order to accurately calculate the position of the information code, the data frame is first rotated or stretched, and generally by affine transformation. For decoding a frame of point code data, a complete decoding unit must be obtained, and after affine transformation, point code units need to be reconstructed because the arrangement of the obtained point codes may not be in one point code unit, but is a combination of half of each of two adjacent point code units. After reconstructing the point code unit, all information of the information codes in the point code frame, including coordinates, page numbers and other defining information (such as which textbook, etc.), can be provided. And finally, correspondingly processing the point code information according to the packet header information.
Specifically, if the Mode is the reading Mode, the server finds the content corresponding to the position pointed by the pen tip according to the decoded information code content, sends the content out in a wireless manner, and sends the content to a specified terminal for playback, wherein the terminal can be a playback device on a mobile phone, a computer or a pen. If the Mode is represented as the writing Mode, the server stores the coordinate trace point in the storage space corresponding to the ID number for subsequent processing, such as classification summary or evaluation analysis. For example, on a piece of teaching material, a reading mode can be entered at a new word position to realize the point reading operation of the remote device, in addition, a dot matrix pen can be switched to enter a track recording mode to answer the problem at the practice problem position of the teaching material, and the difficult points or key parts of the teaching material can be annotated, and the annotations can be collected and arranged in the server.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention not only can greatly reduce the cost and the power consumption of the dot matrix pen, but also can realize the integration of the dot matrix pen point reading function and the track input by transmitting the data frame to the server for decoding.
The embodiment of the present invention further provides an electronic device, which includes a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the transceiver, the memory, and the processor are connected via the bus, and when the computer program is executed by the processor, the processes of the embodiment of the decoding method are implemented, and the same technical effects can be achieved, and are not described herein again to avoid repetition.
In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements each process of the embodiment of the decoding method, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and the present invention shall be covered by the claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A dot matrix pen system, comprising:
the dot matrix pen is in wireless communication connection with the server and used for reading the dot code image, generating a data frame related to dot code coordinates of the dot code image and transmitting the data frame to the server;
and the server is in wireless communication connection with the terminal equipment and is used for decoding the data frame to obtain decoding information and transmitting the decoding information to the terminal equipment for displaying.
2. A dot matrix pen system according to claim 1, wherein the dot matrix pen comprises:
the processor is respectively connected with the microswitch and the point code coordinate extraction unit and is used for sending an instruction to enable the point code coordinate extraction unit to process the acquired point code image to obtain a coordinate of the point code when the pen core is contacted with the microswitch;
and the camera is connected with the point code coordinate extraction unit and is used for collecting the point code image.
3. A dot matrix pen system according to claim 2, wherein the dot matrix pen further comprises:
and the wireless transmission unit is connected with the processor and is used for transmitting the data frame to the server.
4. A method of decoding, comprising:
step 1: acquiring a point code image;
step 2: preprocessing the point code image to obtain a preprocessed point code image;
and step 3: extracting coordinates of the preprocessed point code image to obtain point code coordinates;
and 4, step 4: packing the dot code coordinates, the dot matrix pen ID number and the operation mode information code into a data frame;
and 5: and analyzing the data frame by using a server to obtain decoding information.
5. A decoding method according to claim 4, characterized in that said step 5: analyzing the data frame by using a server to obtain decoding information, wherein the method comprises the following steps:
step 5.1: reading a data frame header and adding the data frame to a decoding queue corresponding to the dot matrix pen ID number;
step 5.2: and decoding the data frame by adopting the decoding queue to obtain decoding information.
6. A decoding method according to claim 5, characterized in that, in step 5.2: after the decoding queue is adopted to decode the data frame to obtain decoding information, the method further comprises the following steps:
step 5.3: when the analyzed operation mode information code is a read mode, the server sends the decoding information to the terminal equipment for displaying;
step 5.4: and when the analyzed operation mode information code is a writing mode, the server stores the decoding information in a storage space corresponding to the ID number of the dot matrix pen for storage.
7. An electronic device comprising a bus, a transceiver, a memory, a processor and a computer program stored on the memory and executable on the processor, the transceiver, the memory and the processor being connected via the bus, characterized in that the computer program realizes the steps in a decoding method as claimed in any one of claims 4 to 6 when executed by the processor.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of a decoding method as claimed in any one of the claims 4 to 6.
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| CN202211322002.3A CN115376134A (en) | 2022-10-27 | 2022-10-27 | Dot matrix pen system and decoding method |
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| CN202211322002.3A CN115376134A (en) | 2022-10-27 | 2022-10-27 | Dot matrix pen system and decoding method |
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