JP7298200B2 - Electronic blackboard and image correction method - Google Patents

Description

The present invention relates to an electronic blackboard and an image correction method.

Patent Document 1 below discloses that an image drawn on a display or an image captured by a camera is shared with an electronic blackboard, a video conference terminal, or a PC at another site by having an electronic blackboard function and a video conference function. An electronic blackboard is disclosed that can

However, with the electronic blackboard of Patent Document 1, when drawing is performed on the display during a video conference, the camera attached to the display may shake due to the pen pressure, and there is a risk that the shaken image may be transmitted to other sites. There is

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art, and to suppress transmission of shaky video to other sites during a video conference.

In order to solve the above-described problems, the electronic blackboard of the present invention includes a display on which drawing can be performed by an operating body, a camera attached to the display, and a shake correcting section for correcting shake of an image captured by the camera. Prepare.

According to the present invention, it is possible to prevent a shaky image from being transmitted to another site during a video conference.

System configuration diagram of the video conference system according to the first embodiment Hardware configuration diagram of the electronic blackboard according to the first embodiment FIG. 2 is a diagram showing a usage example of the electronic blackboard according to the first embodiment; FIG. 4 is a diagram for explaining the hovering detection function of the touch panel display in the electronic blackboard according to the first embodiment; FIG. 2 is a block diagram showing the functional configuration of the electronic blackboard according to the first embodiment; 4 is a flow chart showing the procedure of processing by the electronic blackboard according to the first embodiment; FIG. 4 is a diagram showing an example of an image (before shake correction by a shake correction unit) captured by a camera on the electronic blackboard according to the first embodiment; FIG. 4 is a diagram showing an example of an image (after shake correction by a shake correction unit) captured by a camera on the electronic blackboard according to the first embodiment; FIG. 4 is a diagram showing an example of an image (after shake correction by a shake correction unit) captured by a camera on the electronic blackboard according to the first embodiment; Block diagram showing the functional configuration of the electronic blackboard according to the second embodiment Flowchart showing the procedure of processing by the electronic blackboard according to the second embodiment

[First embodiment]
A first embodiment of the present invention will be described below with reference to the drawings.

(Configuration of video conference system 1)
FIG. 1 is a system configuration diagram of a video conference system 1 according to the first embodiment. The video conference system 1 shown in FIG. 1 can hold a video conference between a plurality of electronic blackboards 16 installed at a plurality of bases. As shown in FIG. 1, the video conference system 1 includes a conference server 12, a conference reservation server 14, and a plurality of electronic whiteboards 16.

Each electronic whiteboard 16 is connected to the conference server 12, the conference reservation server 14, and other electronic whiteboards 16 via a communication network 18 such as the Internet, an intranet, and a LAN (Local Area Network). Each electronic whiteboard 16 can have a video conference with other electronic whiteboards 16 via the communication network 18 .

While the video conference is being held, each electronic blackboard 16 transmits various data to the other electronic blackboards 16 participating in the video conference, and sends various data from the other electronic blackboards 16 participating in the video conference. By receiving various data, it is possible to share various data with other electronic blackboards 16 participating in the video conference.

Various data shared in the video conference include, for example, image data captured by a camera, audio data input from a microphone, drawing data written to a touch panel display, and the like. Further, each electronic blackboard 16 can hold a video conference not only with other electronic blackboards 16 but also with a video conference terminal, a PC, or the like.

The conference server 12 performs various controls related to the video conference. For example, the conference server 12 monitors the communication connection state between each electronic whiteboard 16 and the conference server 12, calls each electronic whiteboard 16, and the like, at the start of the video conference. Also, the conference server 12 performs transfer processing of various data among the plurality of electronic blackboards 16 during the video conference.

The conference reservation server 14 manages conference information regarding video conferences. For example, the organizer of the conference inputs the conference information in advance to the conference reservation server 14 from the terminal device. The electronic blackboard 16 inquires about the conference information to the conference reservation server 14 at the time of startup or the like, and if the corresponding conference information exists, the video conference is held based on the conference information. The meeting information includes, for example, the date and time of the meeting, the place, the participants in the meeting, their roles, the electronic blackboard 16 to be used, and other information.

(Hardware Configuration of Electronic Blackboard 16)
FIG. 2 is a hardware configuration diagram of the electronic blackboard 16 according to the first embodiment. As shown in FIG. 2, the electronic blackboard 16 includes a CPU (Central Processing Unit) 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, an SSD (Solid State Drive) 204, a network I/ F205 and an external device connection I/F (Interface) 206 are provided.

Among these, the CPU 201 controls the operation of the electronic blackboard 16 as a whole. The ROM 202 stores programs used to drive the CPU 201, such as the CPU 201 and an IPL (Initial Program Loader). A RAM 203 is used as a work area for the CPU 201 . The SSD 204 stores various data such as electronic blackboard programs. A network controller 205 controls communication with the communication network 18 . The external device connection I/F 206 is an interface for connecting various external devices. The external devices in this case are, for example, a USB (Universal Serial Bus) memory 230 and external devices (microphone 240, speaker 250, camera 260).

The electronic blackboard 16 also includes a capture device 211, a GPU 212, a display controller 213, a contact sensor 214a, a sensor controller 215, an electronic pen controller 216, a short-range communication circuit 219, an antenna 219a of the short-range communication circuit 219, a power switch 222 and Selection switches 223 are provided.

Among them, the capture device 211 causes the display of an external PC (Personal Computer) 270 to display video information as a still image or moving image. A GPU (Graphics Processing Unit) 212 is a semiconductor chip that specializes in graphics. The display controller 213 controls and manages screen display in order to output an output image from the GPU 212 to the display 214b or the like.

Contact sensor 214a constitutes touch panel display 214 together with display 214b. The contact sensor 214a detects the proximity state (distance and position) of the operating body (electronic pen 290, user's hand H, etc.) to the surface of the display 214b. The contact sensor 214a inputs and detects coordinates by a capacitance method. In the contact sensor 214a, the capacitance of detection electrodes arranged in a grid on the display 214b changes depending on the proximity state of the operator to the display 214b. The sensor controller 215 identifies the proximity state of the operating object based on this change in capacitance.

The electronic pen controller 216 communicates with the electronic pen 290 to determine whether or not the display 214b has been touched with the tip of the pen or the bottom of the pen. The short-range communication circuit 219 is a communication circuit such as NFC (Near Field Communication) or Bluetooth (registered trademark). The power switch 222 is a switch for switching ON/OFF of the power of the electronic blackboard 16 . The selection switches 223 are, for example, a group of switches for adjusting the brightness and color of the display on the display 214b.

Furthermore, the electronic blackboard 16 is provided with a bus line 210 . A bus line 210 is an address bus, a data bus, or the like for electrically connecting each component such as the CPU 201 shown in FIG.

(Usage example of the electronic blackboard 16)
FIG. 3 is a diagram showing a usage example of the electronic blackboard 16 according to the first embodiment. As shown in FIG. 3, the electronic blackboard 16 includes a touch panel display 214, and writing can be performed on the touch panel display 214 using an electronic pen 290 or the like. The touch panel display 214 is a combination of the display 214b and the contact sensor 214a shown in FIG.

The electronic blackboard 16 can share the data written on the touch panel display 214 with the electronic blackboards 16 at other sites via the communication network 18 . Further, the electronic blackboard 16 can share the image of its own site captured by the camera 260 and the sound of its own site acquired by the microphone 240 with the electronic blackboards 16 of other sites via the communication network 18. can.

In addition, the electronic blackboard 16 can output from the display 214b and the speaker 250 the video and audio of the other site transmitted from the electronic whiteboard 16 of the other site. In the example shown in FIG. 3, the camera 260 is provided in the frame portion around the touch panel display 214, but the camera 260 is not limited to this, and may be attached to another portion around the touch panel display 214. It may have been

(Hovering detection function)
FIG. 4 is a diagram for explaining the hovering detection function of the touch panel display 214 in the electronic blackboard 16 according to the first embodiment. FIG. 4 shows the distance between the operating body and touch panel display 214 when the operating body (electronic pen 290, finger, etc.) approaches and touches touch panel display 214 and then moves away from touch panel display 214. represents the relationship between distance and time.

As shown in FIG. 4, when the operating body approaches the touch panel display 214 (time 0 to t1), when the distance between the operating body and the touch panel display 214 reaches the distance d1 (time t0). , the touch panel display 214 becomes capable of hovering detection. Further, when the operating body is brought closer to the touch panel display 214, the operating body comes into contact with the touch panel display 214 (time t1).

Further, as shown in FIG. 4, when the operating body is in contact with the touch panel display 214 (time t1 to t2), the distance between the operating body and the touch panel display 214 does not change (it is constant at 0). ).

Further, as shown in FIG. 4, when the operating body moves away from the touch panel display 214 (from time t2), when the distance between the operating body and the touch panel display 214 becomes greater than the distance d1 ( From time t3), the touch panel display 214 becomes unable to detect hovering.

(Functional Configuration of Electronic Blackboard 16)
FIG. 5 is a block diagram showing the functional configuration of the electronic blackboard 16 according to the first embodiment. As shown in FIG. 5 , the electronic blackboard 16 includes an image acquisition unit 501 , a proximity determination unit 502 , a shake correction control unit 503 , a shake correction unit 504 and an image output unit 505 .

The video acquisition unit 501 acquires video captured by the camera 260 .

The proximity determination unit 502 determines the proximity state of the operating object to the touch panel display 214 .

For example, the proximity determination unit 502 determines whether the touch panel display 214 has detected hovering of the operating body. Hovering means that the operating object has come close to a distance d1 that can be detected by the touch panel display 214 .

Also, for example, the proximity determination unit 502 determines whether or not the touch panel display 214 has detected the contact of the operating object. Also, for example, the proximity determination unit 502 determines whether or not the operating body has moved away from the touch panel display 214 .

For example, the touch panel display 214 can detect hovering, contact, and separation of the operating body based on the change in capacitance, since the capacitance changes according to the proximity state of the operating body.

The shake correction control unit 503 controls whether or not to cause the shake correction unit 504 to perform shake correction on the image acquired by the image acquisition unit 501 based on the determination result of the proximity determination unit 502 .

For example, when the proximity determination unit 502 determines that the touch panel display 214 has detected hovering of the operating body, the shake correction control unit 503 causes the shake correction unit 504 to start shake correction.

Further, for example, when the proximity determination unit 502 determines that the touch panel display 214 has detected separation of the operating object, the shake correction control unit 503 causes the shake correction unit 504 to end the shake correction.

A shake correction unit 504 performs shake correction on the image acquired by the image acquisition unit 501 . For example, when the shake correction control unit 503 instructs the shake correction unit 504 to start shake correction, the shake correction unit 504 starts shake correction for the image acquired by the image acquisition unit 501 . When the shake correction control unit 503 instructs the shake correction unit 504 to end the shake correction, the shake correction unit 504 ends the shake correction for the image acquired by the image acquisition unit 501 . That is, the shake correction unit 504 does not perform shake correction on the image acquired by the image acquisition unit 501 when the shake correction control unit 503 does not issue an instruction for shake correction.

The image output unit 505 outputs the image subjected to the shake correction by the shake correction unit 504 to the subsequent processing unit during the period when the shake correction is performed by the shake correction unit 504 . On the other hand, the image output unit 505 outputs the image acquired by the image acquisition unit 501 to the subsequent processing unit as it is during the period in which the shake correction unit 504 does not correct the shake. For example, when image processing by an image processing unit needs to be performed as subsequent processing, the image output unit 505 outputs an image to the image processing unit. Further, for example, when it is necessary to perform video transmission processing by the video transmission unit as subsequent processing, the video output unit 505 outputs video to the video transmission unit.

Each function of the electronic blackboard 16 described above is realized, for example, by the CPU 201 executing a program stored in an auxiliary storage device (ROM 202, SSD 204, etc.) in the electronic blackboard 16. FIG. This program may be provided in a state of being installed in the electronic blackboard 16 in advance, or may be provided from the outside and installed in the electronic blackboard 16 . In the latter case, the program may be provided by an external storage medium (e.g., USB memory, memory card, CD-ROM, etc.) or provided by downloading from a server on a network (e.g., Internet, etc.). You may do so.

Also, some of the functions of the electronic blackboard 16 described above may be realized by hardware other than the CPU 201 . For example, the image acquisition unit 501, the shake correction unit 504, and the image output unit 505 may be realized by a processing circuit or the like included in the camera 260. FIG.

Also, each function of the electronic blackboard 16 described above can be realized by one or a plurality of processing circuits. Here, the "processing circuit" in this specification means a processor programmed by software to perform each function, such as a processor implemented by an electronic circuit, or a processor designed to perform each function described above. devices such as ASICs (Application Specific Integrated Circuits), DSPs (digital signal processors), FPGAs (field programmable gate arrays) and conventional circuit modules.

(Procedure of processing by the electronic blackboard 16)
FIG. 6 is a flow chart showing the procedure of processing by the electronic blackboard 16 according to the first embodiment.

First, the proximity determination unit 502 determines whether or not the touch panel display 214 has detected hovering of the operating body (step S601). If it is determined in step S601 that hovering has not been detected (step S601: No), the proximity determination unit 502 executes the process of step S601 again.

On the other hand, if it is determined in step S601 that hovering has been detected (step S601: Yes), the shake correction control unit 503 causes the shake correction unit 504 to start shake correction for the image acquired by the image acquisition unit 501. . In response, the shake correction unit 504 starts shake correction for the image acquired by the image acquisition unit 501 (step S602).

After that, the proximity determination unit 502 determines whether or not the touch panel/display 214 has detected the contact of the operating object (step S603).

If it is determined in step S603 that contact has not been detected (step S603: No), the shake correction control unit 503 determines whether a certain period of time has elapsed since hovering of the operating body was detected in step S601. is determined (step S604).

If it is determined in step S604 that the predetermined time has not passed (step S604: No), the electronic blackboard 16 returns the process to step S603.

On the other hand, if it is determined in step S604 that the predetermined time has passed (step S604: Yes), the shake correction control unit 503 causes the shake correction unit 504 to end the shake correction for the image acquired by the image acquisition unit 501. Let In response, the shake correction unit 504 ends the shake correction for the image acquired by the image acquisition unit 501 (step S605). Then, the electronic blackboard 16 returns the process to step S601.

If it is determined in step S603 that contact has been detected (step S603: Yes), the proximity determination unit 502 determines whether or not the operating object has moved away from the touch panel display 214 (step S606).

If it is determined in step S606 that separation has not been detected (step S606: No), the shake correction control unit 503 executes the process of step S606 again.

On the other hand, if it is determined in step S606 that separation has been detected (step S606: Yes), then the proximity determination unit 502 determines whether the touch panel display 214 has detected contact of the operating body (step S607).

If it is determined in step S607 that contact has been detected (step S607: Yes), the electronic blackboard 16 returns the process to step S606.

On the other hand, if it is determined in step S607 that contact has not been detected (step S607: No), the shake correction control unit 503 determines whether a predetermined time has elapsed since separation of the operating body was detected in step S606. It is determined whether or not (step S608).

If it is determined in step S608 that the predetermined time has not passed (step S608: No), the electronic blackboard 16 returns the process to step S607.

On the other hand, if it is determined in step S608 that the predetermined time has passed (step S608: Yes), the shake correction control unit 503 instructs the shake correction unit 504 to end the shake correction for the image acquired by the image acquisition unit 501. Let In response, the shake correction unit 504 ends the shake correction for the image acquired by the image acquisition unit 501 (step S609).

After that, the electronic whiteboard 16 determines whether or not the video conference has ended (step S610). If it is determined in step S610 that the video conference has not ended (step S610: No), the electronic whiteboard 16 returns the process to step S601. On the other hand, if it is determined in step S610 that the video conference has ended (step S610: Yes), the electronic blackboard 16 ends the series of processes shown in FIG.

Through the series of processes shown in FIG. 6, the electronic blackboard 16 of the first embodiment starts shake correction of the image captured by the camera 260 when hovering of the operating body is detected, and separation of the operating body is detected. After a certain period of time has passed since then, the shake correction of the image captured by the camera 260 can be finished. As a result, the electronic blackboard 16 of the first embodiment can correct the shaking of the image captured by the camera 260 at least while drawing is being performed by the operating body. Therefore, the electronic blackboard 16 of the first embodiment can suppress transmission of a shaken image to another site during a video conference even when the camera 260 shakes due to pen pressure. In addition, since the electronic blackboard 16 of the first embodiment ends shake correction after a certain period of time has passed since separation of the operating body is detected, frequent switching between the start and end of shake correction is suppressed. be able to.

(Specific example of shake correction by electronic blackboard 16)
FIG. 7 is a diagram showing an example of an image (before shake correction by the shake correction unit 504) captured by the camera 260 on the electronic blackboard 16 according to the first embodiment. An image 700 shown in FIG. 7 is an example of an image before shake correction by the shake correction unit 504 . A video 700 is composed of a plurality of frame images. The times t0, t1, t2 and t3 shown in FIG. 7 correspond to the times t0, t1, t2 and t3 shown in FIG.

As shown in FIG. 7, since the operation object has been used for drawing, while the operation object is in contact with the touch panel display 214 (time t1 to t2), the touch panel display 214 vibrates. The camera 260 attached to 214 will wobble and thus the image 700 will wobble. In other words, the position of the subject is not fixed between the multiple frame images.

On the other hand, as shown in FIG. 7, before the operating object starts touching touch panel display 214 (~ time t1) and after the operating object finishes touching touch panel display 214 (time t2~), Since camera 260 does not shake, image 700 does not shake. That is, the position of the subject is fixed between the plurality of frame images.

8 and 9 are diagrams showing an example of an image (after shake correction by the shake correction unit 504) captured by the camera 260 on the electronic blackboard 16 according to the first embodiment. An image 800 shown in FIG. 8 and an image 900 shown in FIG. 9 are examples of images after shake correction by the shake correction unit 504 with respect to the image 700 shown in FIG. The times t0, t1, t2 and t3 shown in FIGS. 8 and 9 correspond to the times t0, t1, t2 and t3 shown in FIG.

The electronic blackboard 16 starts shake correction for the image captured by the camera 260 when the touch panel display 214 detects hovering of the operating object (time t0). Therefore, as shown in FIGS. 8 and 9, while the operating object is in contact with the touch panel display 214 (time t1 to t2), the shake-corrected images 800 and 900 do not shake. That is, in images 800 and 900 after shake correction, the position of the subject is fixed between a plurality of frame images. Note that the image 900 shown in FIG. 9 is obtained by cutting out and enlarging the area in which the subject is shown in advance, as compared with the image 800 shown in FIG. 8 .

Note that the shake correction unit 504 performs shake correction on the image captured by the camera 260 using a known shake correction technique. This shake correction technique may be based on any method. For example, the shake correction unit 504 may correct the shake of the image based on the shake of the subject detected from the image. Further, for example, the shake correction unit 504 may correct the image shake based on the shake of the camera 260 detected by various sensors.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, in the second embodiment, changes from the first embodiment will be described.

(Functional configuration of electronic blackboard 16)
FIG. 10 is a block diagram showing the functional configuration of the electronic blackboard 16 according to the second embodiment. As shown in FIG. 10, the electronic blackboard 16 of the second embodiment is different from the electronic blackboard 16 of the first embodiment in that a preliminary movement detection unit 506 is provided instead of the image acquisition unit 501 .

A preliminary motion detection unit 506 detects a predetermined preliminary motion, which is a motion expected to be performed by the operating tool on the touch panel display 214 . An example of the detection of predetermined preparatory motions is as follows.

- A hall sensor is provided in the pen holder, and the hall sensor detects that the electronic pen 290 is lifted from the pen holder.
- An acceleration sensor is provided in the electronic pen 290, and the movement of the electronic pen 290 is detected by the acceleration sensor.
A human sensor is provided on the electronic blackboard 16, and the human sensor detects that a person has approached the electronic blackboard 16 to a predetermined distance.

The shake correction control unit 503 controls whether or not to cause the shake correction unit 504 to perform shake correction on the image acquired by the image acquisition unit 501 based on the detection result of the preliminary motion detection unit 506 . For example, the shake correction control unit 503 causes the shake correction unit 504 to start shake correction when the preliminary motion detection unit 506 detects a predetermined preliminary motion. Further, for example, the shake correction control unit 503 causes the shake correction unit 504 to end the shake correction when the preliminary motion detection unit 506 detects that the predetermined preliminary motion has been canceled.

(Procedure of processing by the electronic blackboard 16)
FIG. 11 is a flow chart showing the procedure of processing by the electronic blackboard 16 according to the second embodiment.

First, the preliminary motion detection unit 506 determines whether or not a predetermined preliminary motion has been detected (step S1101). If it is determined in step S1101 that the predetermined preliminary movement has not been detected (step S1101: No), the preliminary movement detection unit 506 executes the process of step S1101 again.

On the other hand, if it is determined in step S1101 that a predetermined preliminary motion has been detected (step S1101: Yes), the shake correction control unit 503 causes the image acquired by the image acquisition unit 501 to be shake corrected. to start. In response, the shake correction unit 504 starts shake correction for the image acquired by the image acquisition unit 501 (step S1102).

After that, the preliminary movement detection unit 506 determines whether or not it has detected that the predetermined preliminary movement has been canceled (step S1103).

If it is determined in step S1103 that it has not detected that the predetermined preparatory motion has been canceled (step S1103: No), the preparatory motion detection unit 506 executes the processing of step S1103 again.

On the other hand, if it is determined in step S1103 that the predetermined preliminary motion has been canceled (step S1103: Yes), the shake correction control unit 503 performs shake correction on the image acquired by the image acquisition unit 501. , causes the shake correction unit 504 to terminate. In response, the shake correction unit 504 ends the shake correction for the image acquired by the image acquisition unit 501 (step S1104).

After that, the electronic blackboard 16 determines whether the video conference has ended (step S1105). If it is determined in step S1105 that the video conference has not ended (step S1105: No), the electronic whiteboard 16 returns the process to step S1101. On the other hand, if it is determined in step S1105 that the video conference has ended (step S1105: Yes), the electronic blackboard 16 ends the series of processes shown in FIG.

Through the series of processes shown in FIG. 11, the electronic blackboard 16 of the second embodiment starts correcting the shaking of the image captured by the camera 260 when the predetermined preliminary motion is detected, and the predetermined preliminary motion is canceled. When it is detected, the shake correction of the image captured by the camera 260 can be terminated. As a result, the electronic blackboard 16 of the second embodiment can correct the shaking of the image captured by the camera 260 at least while drawing is being performed by the operating body. Therefore, the electronic blackboard 16 of the second embodiment can suppress transmission of a shaken image to another site during a video conference even when the camera 260 shakes due to pen pressure. In addition, compared to the electronic blackboard 16 of the first embodiment, the electronic blackboard 16 of the second embodiment can suppress frequent switching between the start and end of shake correction through simple processing. can.

As described above, the electronic whiteboard 16 of each of the above embodiments includes the shake correction section 504 that corrects the shake of the image captured by the camera 260 . As a result, even if the camera 260 shakes due to the pen pressure due to drawing on the touch panel display 214 by the operating object, the electronic blackboard 16 of each of the above-described embodiments allows the camera 260 to It is possible to correct the shake of the captured image. Therefore, according to the electronic blackboard 16 of each of the above-described embodiments, it is possible to prevent a shaky image from being transmitted to other bases during a video conference.

Further, in the electronic whiteboard 16 of the first embodiment, the shake correction unit 504 performs shake correction when it is detected that the operating body has approached the touch panel display 214 . As a result, the electronic blackboard 16 of the first embodiment can correct the shake of the image captured by the camera 260 at least while drawing is being performed by the operating body, so that unnecessary shake correction is not performed. can be suppressed.

Further, in the electronic blackboard 16 of the second embodiment, the shake correction unit 504 detects a predetermined preliminary motion in which drawing is expected to be performed by the operating object on the touch panel display 214. I do. As a result, the electronic blackboard 16 of the second embodiment can correct the shake of the image captured by the camera 260 at least while drawing is being performed by the operating body, so that unnecessary shake correction can be performed. can be suppressed.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments, and various modifications or Change is possible.

For example, the start timing and end timing of shake correction by the shake correction unit 504 are not limited to those described in the above embodiment, and may be any timing. However, it is preferable to determine the start timing and end timing of shake correction by the shake correction unit 504 so that the shake correction unit 504 performs shake correction at least while drawing is being performed on the touch panel display 214 .

1 video conference system 12 conference server 14 conference reservation server 16 electronic blackboard 214 touch panel display 214a contact sensor 214b display 18 communication network 250 speaker 260 camera 290 electronic pen 501 image acquisition unit 502 proximity determination unit 503 shake correction control unit 504 shake correction unit 505 video output unit 506 preliminary motion detection unit

WO2016/178365

Claims (5)

a display on which drawing can be performed using an operating body;
a camera attached to the display;
a shake correction unit that corrects shake of the image captured by the camera ,
The shake corrector is
When it is detected that the operating body has approached the display, the correction is performed.
An electronic blackboard characterized by: a display on which drawing can be performed using an operating body;
a camera attached to the display;
a shake correction unit for correcting shake of an image captured by the camera;
with
The shake corrector is
An electronic blackboard, wherein the correction is performed when a predetermined preliminary motion in which drawing by the operating body is expected to be performed on the display is detected. The predetermined preliminary operation is
The electronic pen, which is the operating body, is lifted from the pen holder, the electronic pen moves, or a person approaches the electronic blackboard to a predetermined distance. Item 3. The electronic blackboard according to item 2 . An image correction method used in an electronic blackboard equipped with a display capable of drawing with an operating body and a camera attached to the display,
a shake correction step of correcting the shake of the image captured by the camera ;
In the shake correction step,
When it is detected that the operating body has approached the display, the correction is performed.
An image correction method characterized by: An image correction method used in an electronic blackboard equipped with a display capable of drawing with an operating body and a camera attached to the display,
A shake correction step of correcting the shake of the image captured by the camera.
including
In the shake correction step,
The correction is performed when a predetermined preliminary motion in which drawing by the operating body is expected to be performed on the display is detected.
An image correction method characterized by:

Images