JPS594263A - Display and control system for electronic blackboard - Google Patents

Abstract

PURPOSE:To restore automatically to a present screen after reproducing and displaying past screens, by storing manual information to an information storage device corresponding to a screen number, designating an optional screen number for reading out and displaying the information, and restoring the newest information by the indication of restoration. CONSTITUTION:When a changeover switch 15 is switched to a composite circuit 12 for reproduction and display, the information of the present screen is written in (1) of file 7A, and when the information of the past screen, e.g., (4) is displayed, the information is read out by designating the screen number (4). The screen number (1) corresponding to the number of the present screen is stored as the number for the restoration. After the past screen is displayed for reproduction on a picture display 2 and the restoration is indicated, the information is read out from he file 7A by taking the screen number (1) for restoration stored in advance as the designated screen number and displaying it on the picture display device 2, allowing to restore automatically to the present screen only with the indication of restoration.

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to an electronic whiteboard display control method for automatically returning to the previous screen after reproducing a past screen in an electronic whiteboard device. .

Prior Art and Problems Handwritten information obtained by writing on a handwriting input board is transmitted to the other party's terminal, and displayed on the image display device of the electronic blackboard device of the own terminal and the other party's terminal, thereby holding a remote conference, etc. A method has been proposed to do this. The input means in this case is to obtain handwritten information as coordinate information by drawing a character shape with a felt marker or the like on a handwriting input board such as a whiteboard with a tablet function. It has a configuration that can also output color information so that colored feltbens can be used.

Further, in order to display the handwritten information, a large-screen image display device such as a color projector is used.

There are also devices such as facsimile machines that make hard copies of the displayed content. It is also possible to store handwritten information using a large-capacity image file on a floppy disk device, etc., and read out the handwritten information on a past screen in response to a playback request and play it back on the image display device. After reproducing and displaying a past screen in this way, it is often necessary to return to the current screen.

By adding a screen number to the image file that stores handwritten information and storing the handwritten information, when playing back a past screen, you only need to specify the screen number. Although it is sufficient to specify the current screen number when returning to the current screen, specifying the screen number every time the screen is returned to the current screen has the disadvantage that the operation becomes complicated.

OBJECTS OF THE INVENTION It is an object of the present invention to enable automatic return when returning to the current screen after reproducing and displaying a past screen. Examples will be described in detail below.

Embodiment of the Invention FIG. 1 is an explanatory block diagram of an electronic whiteboard device, in which terminals 10 and 10' are handwriting input boards 1 and 1'', respectively.
, image display device 2.2', and control unit 3.3'
The control section 3.3' has an image storage device, a transmitter/receiver section, a switching means, etc., and when the communication conversation mode is set, the input to the handwriting input board 1 is controlled by the switching control in this control section. The rAJ entered is displayed on the image display devices 2.2° of both terminals, and the “triangular figure” input on the handwriting input board 1” on the terminal 10° is displayed on the image display devices 2.2 of both terminals. It is displayed simultaneously with the above-mentioned rAJ. Therefore, terminal 10, lO
You can hold a meeting using one character and one figure between. Note that voice is also transmitted and received at the same time, and handwritten information is multiplexed with the voice signal and transmitted and received.

FIG. 2 is a block diagram of the main parts of the embodiment of the present invention, and since the terminals 10 and 10° have the same configuration, the explanation will be given below without the dashes in the symbols unless necessary.

The handwriting input board 1 has a plurality of detection lines in the X and Y directions on the back side of the writing surface of a felt pen, for example, and a magnetic field generating part that is excited by alternating current is provided in the felt pen, and the magnetic field from the magnetic field generating part is generated. * By detecting the output line, the coordinate information of the entry position is used as handwritten information. When erasing, coordinate information of the erasure position is output. This handwritten information number is sampled at a fixed frequency, for example, 30 Hz, and then differentially encoded, and is sent to the other party's terminal as a packet along with information such as color information. In that case, when transmitting over a telephone line, the handwritten information mentioned above must be
kHz band, and can be simultaneously transmitted by multiplexing within the 0.3 to 3.4 kHz audio band.

Further, as described above, the image display device 2 is a large screen display device such as a color projector, and is preferably the same size as the handwriting input board 1. Further, a display device 4 similar to a normal color television receiver is provided for monitoring the handwriting input board 1, and a hard copy device 5 such as a facsimile device for recording and outputting the displayed contents as a hard copy as required.

6 is an image memory having a capacity for at least one screen;
7A and 7B are image files that constitute a large-capacity handwritten information storage device such as a floppy disk device; 8 is a transmission buffer that constitutes a main part of a transmitting/receiving unit that buffers handwritten information and transmits it to the other party's terminal; If, 12 is a synthesis circuit, and 13 to 15 are changeover switches.

When the changeover switches 13 and 15 are set to the illustrated state and the changeover switch 14 is switched to the synthesis circuit 11 side, handwritten information from the handwriting board 1 is added to the image memory 6 and image file 7A of the own terminal, and The local mode is displayed only on the image display device 2.

When the changeover switch 13 is turned on, the handwritten information is transmitted to the other party's terminal via the transmission buffer 8, and the handwritten information of the own terminal and the other party's terminal is synthesized by the synthesis circuit 11 and stored in the image memory 6 and the image file. 7A, image display device 2
The handwritten information of the own terminal and the other party's terminal is superimposed and displayed, and the communication conversation mode is entered. In this state, selector switch [
4 to the image file 7B side, the handwritten information of the own terminal is transmitted to the other party's terminal and is stored in the image file 7B, and only the handwritten information of the other party's terminal is displayed on the image display device 2 of the own terminal. and becomes communication individual mode. In this manner, mode setting can be performed by switching the changeover switches 13 and 14.

The image files 7A and 7B sequentially store differentially encoded handwritten information as described above, and add a screen number so that past screens can be searched, and past screens can be played back and displayed. When the need arises, the handwritten information on the desired screen is displayed one after another by specifying the screen number.

The changeover switch 15 is for reading and reproducing and displaying the stored contents of the image files 7A and 7B. When the changeover switch 15 is switched to the synthesis circuit 12 side, the handwritten information stored in the image files 7A and 7B is is reproduced as described above and displayed on the image display device 2. That is, a past screen can be specified and played back.

For example, as shown in FIG. 3, the image files 7A and 7B have cylinder numbers 00 to 79, where 00 is an index cylinder, 01 is a data cylinder that constitutes a directory section, and 02 to 77 are data that constitute a part of a member. The cylinders 77 to 79 have a cylinder configuration of replacement cylinders constituting a spare part, and the number of sectors of the cylinder is 1.
If it is set to 0, the member part will have 760 sectors, each sector will be managed by the directory section, and handwritten information will be stored in the sector (for example, IK bytes). Therefore, even when handwritten information for one screen is stored over a plurality of sectors, sectors can be randomly designated and stored using the directory section.

For example, the directory section consists of a screen management section A and a data management section B, as shown in (al) in FIG.
Consists of P64, and if screen management part A is set to 2 bytes,
Each screen number section has a size of 32 bytes. Also, when one title or one screen is composed of multiple pages, the screen number part POI
-P64 is composed of screen number No., status ST, title section entry number TL, entry number EO-E9 indicating the entry number of data management section B, and spare S, as shown in tc+.

The data management section B designated by entry number EO-89 includes the start sector address, data length, status indicating whether the sector is in use or not, and whether the sector is invalidated due to a defect or the like. .

Therefore, the screen number of the current screen can be identified by the contents of the screen management section A, and when reproducing a past screen, the screen number specified in the screen management section A can be identified by specifying the screen number. reads out the screen number section, reads out the first sector address from the area specified by the entry number of data management section B, and accesses a part of the member;
Handwritten information can be read and displayed on the image display device 2. Then, when you issue a return instruction, the screen number of the current screen is memorized as described above, so depending on that screen number,
You can return to the current screen without specifically specifying the screen number. Such control can be easily realized by means such as program control of a control unit of a floppy disk device, save and return control, and the like.

For example, when switching the selector switch 15 to the synthesis circuit 12 side for playback display, the handwritten information on the current screen is changed to the image file 7.
If you want to read and display the handwritten information written in (1) of A and the past screen, for example (4), by specifying the screen number of (4), the screen management section A and data management section B access a part of the member in which handwritten information is stored, and read the handwritten information. At that time, the screen number (11) corresponding to the current screen number is stored as the return destination number.Image display device 2
After replaying and displaying the past screen, when a return instruction is given, the handwritten information is read from the image file 7A using +11 of the previously stored return destination screen number as the designated screen number, and displayed on the image display device 2. Therefore, with just a return instruction,
You can automatically return to the current screen. Upon completion of this 1y return, the selector switch 15 is switched to the synthesis circuit 11 side, and this switching can also be automated.

Effects of the Invention As explained above, the present invention stores handwritten information in a handwritten information storage device such as an image file in correspondence with a screen number, and when reproducing a past screen, the screen number The current screen can be reproduced and displayed by reading it from the handwriting information storage device based on the assumption that This has the advantage that the operation for returning to the original is very simple. Therefore, if you play and display the previous screen during a remote conference and then return to the current screen to continue the conference, you can easily return to the current screen, allowing the conference to continue smoothly. Become what you can.

Note that the present invention is not limited to the above-described embodiments, but can be applied to electronic whiteboard devices having various configurations having handwritten information storage devices.

[Brief explanation of drawings]

Fig. 1 is an explanatory block diagram of an electronic whiteboard device, Fig. 2 is a block diagram of main parts of an embodiment of the present invention, Fig. 3 is an explanatory diagram of an image file, and Fig. 4 is an explanatory diagram of the configuration of a directory section. . 2 is a handwriting input board, 2 is an image display device, 3 is a control unit, 4 is a display device, 5 is a hard copy device, 6 is an image memory, 7A and 7B are image files, 8 is a transmission buffer, 1
0 is a terminal, 11.12 is a synthesis circuit, and 13 to 15 are changeover switches. Patent applicant: Fujitsu Ltd. Representative Patent Attorney Gobe Tamamushi and 3 others

Claims (1)

[Claims] A handwriting input board, a handwriting information storage device for storing handwritten information from the handwriting input board and handwritten information from a partner terminal, an image display device for displaying the handwritten information, and an image display device for displaying the handwritten information. In an electronic whiteboard device equipped with a transmitting/receiving unit for transmitting and receiving data to and from a partner terminal, the handwritten information is stored in the handwritten information storage device in correspondence with a screen number, and an arbitrary screen number is specified. The handwritten information is read from the handwritten information storage device and displayed on the image display device, and in response to a return instruction, the handwritten information of the screen number of the handwritten information storage device that has stored the latest handwritten information is read out and the handwritten information is displayed on the image display device. An electronic whiteboard display control method characterized by displaying on a display device and returning to display content before displaying a reproduced image.