CN108805108A - A kind of writing on the blackboard person's handwriting recording method - Google Patents
A kind of writing on the blackboard person's handwriting recording method Download PDFInfo
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- CN108805108A CN108805108A CN201810782439.2A CN201810782439A CN108805108A CN 108805108 A CN108805108 A CN 108805108A CN 201810782439 A CN201810782439 A CN 201810782439A CN 108805108 A CN108805108 A CN 108805108A
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- 238000012163 sequencing technique Methods 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 24
- 238000012937 correction Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 230000006698 induction Effects 0.000 description 6
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
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Abstract
Technical scheme of the present invention includes a kind of writing on the blackboard person's handwriting recording method, is included the following steps：Handwriting trace is followed to send out person's handwriting signal；Obtain blackboard image；Real-time capture simultaneously handles person's handwriting signal, generates person's handwriting point image coordinate；Point image of identifying the handwriting coordinate carries out coordinate and is converted to relative coordinate of the person's handwriting point with respect to blackboard；Person's handwriting point relative coordinate is stored according to the time sequencing for capturing person's handwriting signal, generates person's handwriting file.Beneficial effects of the present invention are：Samples storage is carried out by capturing the person's handwriting signal acquisition writing on the blackboard handwriting trace for following and writing focus and sending out, and by person's handwriting signal, obtains person's handwriting file, this method can automatically form the writing on the blackboard data file of compact, and installation cost is relatively low.
Description
Technical field
The present invention relates to a kind of writing on the blackboard person's handwriting recording methods, belong to instructional technology field.
Background technology
Currently in the education activities of Chinese school, teacher generally need carry out lecture content writing on the blackboard (blackboard writing on the blackboard,
Blank writing on the blackboard, electronic writing on blackboard etc.), student is often also required to record lecture content in real time.Due in blackboard limited area, writing on the blackboard
Holding the factors such as more influences, and teacher can usually repeat the process of erasing and writing on the blackboard, be paid attention to the class in several energy this requires student
It is also desirable to quickly record writing on the blackboard content.Therefore too high study requirement is proposed to student, affect the effect of study
Fruit.
Some school developments have recorded broadcast classroom, can record the content of whole course, but the construction cost in recorded broadcast classroom
It is high, it is unsuitable for each classroom construction of school being recorded broadcast classroom；Recorded broadcast process is also relatively complicated, need teacher control and
Coordinate recorded broadcast, influences teaching thinking and teaching efficiency；The file that recorded broadcast is completed also needs to carry out editing, cumbersome to take, and spends old
The too many energy of teacher；Simultaneously it is more most important be recorded broadcast content be all in the form of video store, video file capacity is larger, no
Conducive to propagating and sharing, it is unfavorable for quick-searching selective learning content, user's hardware condition is required too high.
In the above context, it is badly in need of having one kind not changing current teaching method, does not need teacher's intervention, automatically form volume
Small and exquisite writing on the blackboard data file, and lower-cost writing on the blackboard person's handwriting acquisition method.
Invention content
To solve the above problems, the purpose of the present invention is to provide a kind of writing on the blackboard person's handwriting recording method, acquired by capturing
It follows and writes the optical signal acquisition writing on the blackboard handwriting trace that focus is sent out, and person's handwriting signal is subjected to samples storage, obtain person's handwriting text
Part, this method can automatically form the writing on the blackboard data file of compact, participate in making without teacher, improve efficiency, process
Simply, requirement is low.
Technical solution is used by the present invention solves the problems, such as it：
A kind of writing on the blackboard person's handwriting recording method, includes the following steps：
Handwriting trace is followed to send out person's handwriting signal；
Real-time capture simultaneously handles person's handwriting signal, generates person's handwriting point image coordinate；
Obtain blackboard image；
Point image of identifying the handwriting coordinate carries out coordinate and is converted to relative coordinate of the person's handwriting point with respect to blackboard；
Person's handwriting point relative coordinate is stored according to the time sequencing for capturing person's handwriting signal, generates person's handwriting file.
Further, the person's handwriting signal is sent out from the pen tip of writing implement.
Further, the person's handwriting signal is triggered by pressure sensitive.
Further, the person's handwriting signal is the optical signal of default frequency range.
Further, the step of real-time capture and handling person's handwriting signal, generating person's handwriting point image coordinate include：
Filter out the optical signal in addition to person's handwriting signal；
Person's handwriting signal after real-time capture filtering obtains handwriting image；
Image of identifying the handwriting establishes the first coordinate system, obtains person's handwriting point image coordinate.
Further, the point image coordinate of identifying the handwriting carries out the relative coordinate that coordinate is converted to person's handwriting point with respect to blackboard
Further include following steps before step：
Blackboard image is detected with the presence or absence of distortion；
If blackboard image has distortion, image distortion correction is carried out to blackboard image.
Further, the point image coordinate of identifying the handwriting carries out the relative coordinate that coordinate is converted to person's handwriting point with respect to blackboard
Step, including：
The second coordinate system is established according to blackboard position；
It carries out coordinate according to the coordinate relationship of image distortion correction point image coordinate of identifying the handwriting to be converted to person's handwriting point opposite
The relative coordinate of blackboard.
Further, person's handwriting point relative coordinate is stored according to the time sequencing for capturing person's handwriting signal, generates the step of person's handwriting file
Suddenly, further include：
It identifies the handwriting according to predeterminated frequency and is a little sampled, the relevant information of pen trace point, and carried out according to sampling order
Storage.
A kind of writing on the blackboard person's handwriting recording device, for realizing above-mentioned writing on the blackboard person's handwriting recording method, including：
Person's handwriting signal source, for following handwriting trace to send out person's handwriting signal in writing on the blackboard；
Induction module is used for real-time capture person's handwriting signal, obtains writing on the blackboard trace image, and obtain blackboard image；
Acquisition processing module, the acquisition for controlling induction module acts, and carries out relevant treatment to the data of acquisition and obtain
To person's handwriting point relevant information；
Samples storage module, for identifying the handwriting, relevant information carries out samples storage, generates person's handwriting file.
Further, the person's handwriting signal source includes：
Optical signal transmitter, the optical signal for emitting instruction person's handwriting；
Lettering pen fixed cell, for fixing lettering pen；
Pressure sensitive unit, for controlling optical signal transmitter switch according to pressure sensitive；
Power supply unit, for providing working power for the person's handwriting signal source.
The beneficial effects of the invention are as follows：A kind of writing on the blackboard person's handwriting recording method and device that the present invention uses, by capture with
The person's handwriting signal acquisition writing on the blackboard handwriting trace sent out with focus is write, and person's handwriting signal is subjected to samples storage, obtain person's handwriting text
Part, this method can automatically form the writing on the blackboard data file of compact, participate in making without teacher, improve efficiency, process
Simply, requirement is low.
Description of the drawings
Fig. 1 is the method flow diagram of the embodiment of the present invention；
Fig. 2 is the person's handwriting point acquisition process flow chart of the embodiment of the present invention；
Fig. 3 is the apparatus module figure of the embodiment of the present invention；
Fig. 4 is the further apparatus module relation schematic diagram of the embodiment of the present invention；
Fig. 5 is the fault image example of the embodiment of the present invention；
Fig. 6 is the example images after the image distortion correction of the embodiment of the present invention；
Fig. 7 is the example images that the light filtered image collecting unit of the embodiment of the present invention receives.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, right in the following with reference to the drawings and specific embodiments
The present invention is described in detail.The writing on the blackboard that the writing on the blackboard person's handwriting recording method of the present invention and device are suitable for classroom instruction records.
- Fig. 7 referring to Fig.1, a kind of writing on the blackboard person's handwriting recording device of the invention is as shown in figure 3, include：
Person's handwriting signal source, for following handwriting trace to send out person's handwriting signal in writing on the blackboard；
Induction module is used for real-time capture person's handwriting signal, obtains writing on the blackboard trace image, and obtain blackboard image；
Acquisition processing module, the acquisition for controlling induction module acts, and carries out relevant treatment to the data of acquisition and obtain
To person's handwriting point relevant information；
Samples storage module, for identifying the handwriting, relevant information carries out samples storage, generates person's handwriting file.
Further specific device is as shown in figure 4, specifically, person's handwriting signal source includes optical signal transmitter, lettering pen fixes
Unit, pressure sensitive unit and power supply unit；
Wherein, optical signal transmitter, setting is in writing implement pen tip, the optical signal for emitting instruction person's handwriting；Light is believed
The laser, infrared light or visible light of special frequency channel number may be used；Here, using narrowband infrared LED as optical signal transmitter；
In order to accurately obtain the handwriting trace of writing on the blackboard, pass through the switch of pressure sensitive unit triggers optical signal transmitter, when writing, pressure
Power sensing unit detects the pressure between lettering pen and blackboard, then triggers the light letter that optical signal transmitter sends out special frequency channel
Number, and no pressure generates when not write, between lettering pen and blackboard, optical signal transmitter does not send out optical signal, as a result, light
Signal can reflect handwriting trace；Lettering pen can be and optical signal transmitter, lettering pen fixed cell, pressure sensitive unit and confession
The integrated special handwriting of electric unit, can also be it is self-existent coordinate optical signal transmitter, lettering pen fixed cell,
The common chalk or other lettering pens that pressure sensitive unit and power supply unit use；In order to which applicability is extensive, used here as writing
When fixed cell fixes common chalk and is used as writing implement, chalk pen tip and blackboard contact squeeze, chalk end squeeze pressure
Sensing unit is to trigger optical signal transmitter work；The work electricity consumption of person's handwriting signal source is provided by battery, for environmental protection, again
Multiple to utilize, battery uses rechargeable battery.
Specifically, induction module includes light filter element and image acquisition units；
Wherein, it acquires the image information in entire blackboard region in order to complete display and prevents optical signal transmitter from sending out
Person's handwriting signal be blocked, image acquisition units are video camera, using nearly burnt, wide-angle camera lens, can even be adopted as needed
With the wide-angle lens for having distortion, and it is fixed on the upper front of blackboard；When induction module is started to work, image acquisition units are first
Blackboard image is first acquired, blackboard position is got；When acquiring person's handwriting signal, other light interfere in order to prevent, and person's handwriting is made to believe
It number is more clear, light filter element is set before image acquisition units camera lens here, when acquiring blackboard image, light filtering is single
Member is in closed state, is opened when acquiring person's handwriting signal, and the special frequency channel optical signal that optical signal transmitter emits only is allowed to pass through so that
Image acquisition units only acquire person's handwriting signal, and the person's handwriting signal that light filtered image collecting unit receives is as shown in Figure 7.
Specifically, acquisition processing module includes acquisition control unit, distortion correction unit and coordinate transformation unit；
Wherein, handwriting image is shot to acquisition control unit control image acquisition units high-frequency, control light filtering is single
Interference information in member removal image, and the person's handwriting point image coordinate that rapidly and accurately identification writing on the blackboard person's handwriting passes through；Due to image
Collecting unit is fixed on front on blackboard, and the image of shooting may be up big and down small, and uses nearly burnt, wide-angle lens, the figure of shooting
As may also generate distortion, a kind of distortion example is as shown in figure 5, the person's handwriting point image coordinate of the person's handwriting point therefore obtained and really
The position of situation is devious, and therefore, it is necessary to the blackboard images that will be shot and handwriting image to be sent into the progress of distortion correction unit
Further correction process, the image after correction are as shown in Figure 6；And the image of image acquisition units shooting is merely not only blackboard
Region further includes the region outside blackboard, it is therefore desirable to person's handwriting point image coordinate be carried out coordinate system conversion, it is opposite to obtain person's handwriting point
In the relative coordinate of blackboard, the relative coordinate then illustrate person's handwriting point blackboard physical location.
Specifically, samples storage module is sampled according to certain frequency relevant information a little of identifying the handwriting, it is per second here
20 person's handwriting points are sampled, the sample information of each person's handwriting point includes its start-stop mark, relative time and person's handwriting point with respect to blackboard
Relative coordinate, the sample information of each person's handwriting point is a storage cell, occupied space only about 6 bytes, all pens here
Mark point is stored successively according to relative time, obtains complete person's handwriting file；Assuming that class 1 hour and always in writing on the blackboard,
20 person's handwriting points of sampling per second, then person's handwriting file only take up the memory space of about 0.41MB, it is big compared to classroom recorded broadcast video
Reduce file size greatly；The person's handwriting file can be decoded by corresponding writing on the blackboard person's handwriting reader and be played, when broadcasting, according to opposite
Time successively shows handwriting trace, can restore classroom blackboard-writing overall process and full details.
The recording method of writing on the blackboard person's handwriting is as shown in Figure 1, include the following steps：Handwriting trace is followed to send out person's handwriting signal；It obtains
Blackboard image；Real-time capture simultaneously handles person's handwriting signal, generates person's handwriting point image coordinate；Point image of identifying the handwriting coordinate carries out coordinate and turns
Get relative coordinate of the person's handwriting point with respect to blackboard in return；Person's handwriting point relative coordinate is stored according to the time sequencing for capturing person's handwriting signal,
Generate person's handwriting file.
The acquisition process flow of specific person's handwriting point is as shown in Figure 2, wherein in order to precisely capture writing on the blackboard handwriting trace, pen
Mark signal is used to be triggered by pressure sensitive, the special frequency channel optical signal sent out from the pen tip of writing implement, used here as red
Outer light is as person's handwriting signal.
Specifically, the step of real-time capture and handling person's handwriting signal, generating person's handwriting point image coordinate includes：It filters out and removes pen
Optical signal other than mark signal；Person's handwriting signal after real-time capture filtering obtains handwriting image；Image of identifying the handwriting establishes first
Coordinate system obtains person's handwriting point image coordinate.
It is gone back before with respect to the relative coordinate of blackboard specifically, point image coordinate progress coordinate of identifying the handwriting is converted to person's handwriting point
Include the following steps：Blackboard image is detected with the presence or absence of distortion；If blackboard image has distortion, image is carried out to blackboard image
Distortion correction.
Specifically, point image coordinate of identifying the handwriting, which carries out coordinate, is converted to step of the person's handwriting point with respect to the relative coordinate of blackboard
Suddenly, including：The second coordinate system is established according to blackboard position；It is identified the handwriting point image coordinate according to the coordinate relationship of image distortion correction
It carries out coordinate and is converted to relative coordinate of the person's handwriting point with respect to blackboard.
Specifically, storing person's handwriting point relative coordinate according to the time sequencing for capturing person's handwriting signal, the step of person's handwriting file is generated
Suddenly, further include：Identify the handwriting according to predeterminated frequency and a little sampled, the relevant information of pen trace point, and according to sampling order into
Row storage.
More than, only presently preferred embodiments of the present invention, the invention is not limited in the above embodiments, as long as its with
Identical means reach the technique effect of the present invention, should all belong to the scope of protection of the present invention.Within the scope of the present invention
Its technical solution and/or embodiment can have a variety of different modifications and variations.
Claims (8)
1. a kind of writing on the blackboard person's handwriting recording method, which is characterized in that include the following steps：
Handwriting trace is followed to send out person's handwriting signal；
Obtain blackboard image；
Real-time capture simultaneously handles person's handwriting signal, generates person's handwriting point image coordinate；
Point image of identifying the handwriting coordinate carries out coordinate and is converted to relative coordinate of the person's handwriting point with respect to blackboard；
Person's handwriting point relative coordinate is stored according to the time sequencing for capturing person's handwriting signal, generates person's handwriting file.
2. writing on the blackboard person's handwriting recording method according to claim 1, it is characterised in that：The person's handwriting signal is from writing implement
Pen tip is sent out.
3. writing on the blackboard person's handwriting recording method according to claim 1, it is characterised in that：The person's handwriting signal passes through pressure sensitive
Triggering.
4. writing on the blackboard person's handwriting recording method according to claim 1, it is characterised in that：The person's handwriting signal is default frequency range
Optical signal.
5. writing on the blackboard person's handwriting recording method according to claim 4, it is characterised in that：The real-time capture simultaneously handles person's handwriting letter
Number, generate person's handwriting point image coordinate the step of include：
Filter out the optical signal in addition to person's handwriting signal；
Person's handwriting signal after real-time capture filtering obtains handwriting image；
Image of identifying the handwriting establishes the first coordinate system, obtains person's handwriting point image coordinate.
6. writing on the blackboard person's handwriting recording method according to claim 5, it is characterised in that：The point image coordinate progress of identifying the handwriting
Coordinate further includes following steps before being converted to the step of relative coordinate of the person's handwriting point with respect to blackboard：
Blackboard image is detected with the presence or absence of distortion；
If blackboard image has distortion, image distortion correction is carried out to blackboard image.
7. writing on the blackboard person's handwriting recording method according to claim 6, it is characterised in that：The point image coordinate progress of identifying the handwriting
Coordinate is converted to the step of relative coordinate of the person's handwriting point with respect to blackboard, including：
The second coordinate system is established according to blackboard position；
It carries out coordinate according to the coordinate relationship of image distortion correction point image coordinate of identifying the handwriting and is converted to person's handwriting point with respect to blackboard
Relative coordinate.
8. writing on the blackboard person's handwriting recording method according to claim 1, it is characterised in that：It is suitable according to the time for capturing person's handwriting signal
The step of sequence storage person's handwriting point relative coordinate, generation person's handwriting file, further include：
It identifies the handwriting according to predeterminated frequency and is a little sampled, the relevant information of pen trace point, and stored according to sampling order.
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|---|---|---|---|
| CN201810782439.2A CN108805108B (en) | 2018-07-17 | 2018-07-17 | Method for recording handwriting of blackboard |
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| CN201810782439.2A CN108805108B (en) | 2018-07-17 | 2018-07-17 | Method for recording handwriting of blackboard |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020133108A1 (en) * | 2018-12-27 | 2020-07-02 | 深圳市柔宇科技有限公司 | Handwriting acquisition method, handwriting transmission method and apparatus, and graphics tablet and system therefor |
| CN111881904A (en) * | 2020-07-31 | 2020-11-03 | 城云科技（中国）有限公司 | Blackboard writing recording method and system |
| CN111949145A (en) * | 2020-07-21 | 2020-11-17 | 深圳市鹰硕教育服务股份有限公司 | Intelligent pen image processing method and device and electronic equipment |
| WO2022016649A1 (en) * | 2020-07-21 | 2022-01-27 | 深圳市鹰硕教育服务有限公司 | Method and apparatus for image processing of smart pen, and electronic device |
| CN114407561A (en) * | 2021-12-23 | 2022-04-29 | 湖南铁道职业技术学院 | Blackboard erasing method based on AIoT technology and intelligent blackboard eraser assembly |
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| Publication number | Publication date |
|---|---|
| CN108805108B (en) | 2024-03-12 |
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