JPH0326855B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to an electronic blackboard device, particularly when characters are written on an electronic blackboard in which sense lines etc. are embedded using a writing instrument with a built-in oscillator. Reading information such as the characters and storing them in an image memory, and erasing the characters, etc. stored in the image memory when the characters, etc. written on the electronic blackboard are erased using a blackboard eraser with a built-in oscillator. The present invention relates to an electronic whiteboard device configured to perform.

[Problems to be solved by conventional technology and invention]

Conventionally, when converting characters written on a blackboard into an image signal, the characters are written on a sheet-like blackboard, and the blackboard is gradually moved in a winding manner while a reading sensor is used to convert the characters, etc. was read sequentially and converted into an image signal. For this reason, in general, the blackboard could only be read after all characters had been written on it. Moreover, since a light source, a reading sensor, a moving mechanism, etc. are required for the reading, there is a problem that the mechanism becomes complicated. There is also a so-called digitizer for inputting coordinates of points on a plane into a computer system. The digitizer is generally used mainly for inputting the coordinates of points on a plane, and although it is possible to input the written characters etc. in the form of position coordinates, , it is difficult to enter colored characters such as green (G) or blue (B), and it is also difficult to easily erase only the desired portion using a blackboard eraser.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention writes characters, etc. on an electronic blackboard in which sense lines etc. are embedded using a chiyoke equipped with a built-in oscillator that oscillates a frequency corresponding to a color, and the written characters, etc. The position information and color information of the electronic blackboard are detected in the form of electric signals and stored in the image memory, and the image is erased using a blackboard eraser with a built-in oscillator to erase colored characters written on the electronic blackboard. By erasing the corresponding information stored in the memory, colored characters, etc. can be stored in the image memory, etc. in the form of image signals using a simple configuration, and the characters, etc. stored in the image memory can be erased using a blackboard eraser. It is being erased. Therefore, the electronic blackboard device of the present invention is an electronic blackboard device that converts characters written on the electronic blackboard into an image signal, and includes a plurality of sensors embedded in the electronic blackboard in the vertical and horizontal directions, and a frequency discriminator for discriminating a predetermined frequency signal from signals detected by the sensors; a scanning device for scanning the signals detected by each of the sensors; a coordinate detection section that determines from which position of the plurality of embedded sensors a signal is detected from among the signals; and a frequency discriminated by the frequency discriminator and detected by the coordinate detection section. The electronic board is equipped with an image memory that stores image signals corresponding to characters written on the electronic blackboard based on the positions of the electronic blackboards. An oscillator that stores, in the image memory, an image signal including a frequency signal and position information corresponding to the color of characters, etc. when characters are written on a blackboard, and generates a predetermined frequency signal different from that of a writing instrument. When characters written on the electronic blackboard are erased using a built-in blackboard eraser, the frequency signal and position information of the blackboard eraser are detected, and based on that, the image signal corresponding to the erased characters is sent to the electronic blackboard. It is characterized by erasing from the image memory.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a configuration diagram of one embodiment of the present invention, and FIG. 2 is an operation explanatory diagram for explaining the operation of the configuration of one embodiment of the present invention shown in FIG. 1.

In the figure, 1 is an electronic whiteboard, 2-1 and 2-2 are multiplexers, 3-1 and 3-3 are chiyoke,
4 is blackboard eraser, 5-1, 5-2 are band pass
Filter, 6-1, 6-2 are amplifiers, 7-1, 7
-2 is a pulse shaping section, 8-1 and 8-2 are level detection sections, 9 is a frequency discriminator, 10 is an XY coordinate detection section, 11 is a color information detection section, 12 is a video circuit, 13 is an image memory, 14 represents the display.

In FIG. 1, sense lines are embedded in a matrix in the electronic blackboard 1 in the horizontal direction (X direction) and vertical direction (Y direction) as indicated by dotted lines. Each sense line is connected to multiplexers 2-1 and 2-2, respectively, as shown. Therefore, as will be described later, if red characters are written on the electronic blackboard 1 using, for example, the red (R) yoke 3-1 shown in the figure, the frequency ₁ emitted from the oscillator built in the yoke 3-1 will be A signal (frequency signal corresponding to red) is detected by the sense line, and positional information of characters etc. is obtained by scanning the sense line using multiplexers 2-1 and 2-2. It is detected in the form of the coordinates of the intersection of the sense lines. In this way, by writing characters, etc. on the electronic blackboard 1 using the red (R), green (G), or blue (B) chalks 3-1 to 3-3, the color information of the characters, etc. and position coordinates are detected and stored in the image memory 13 in the figure. In addition, when characters written on the electronic blackboard 1 are erased using the blackboard eraser 4 in the figure, the frequency emitted from the oscillator built in the blackboard eraser 4 is
The signal ₀ (frequency signal corresponding to blackboard erasing) and position are detected by the sense line, and characters and the like existing in the corresponding area in the image memory 13 are erased. The configuration and operation will be explained in detail below.

In the figure, multiplexers 2-1 and 2-2 are used to scan sense lines indicated by dotted lines arranged in the electronic blackboard 1 in the X direction and the Y direction, respectively. Therefore, as described above, the locus of characters written on the electronic blackboard 1 through the scanning is sequentially detected in the form of the coordinates of the intersections of the sense lines. Color information can be determined based on the frequency detected from the sense line.

Band pass filters 5-1, 5-2 in the diagram
is for removing noise etc. from the signals obtained by scanning the sense lines by the multiplexers 2-1 and 2-2 and selectively extracting only signals in a desired frequency range, respectively. It is something.

In the figure, amplifiers 6-1 and 6-2 are for amplifying the signals from which noise and the like have been removed by the band pass filters 5-1 and 5-2, respectively.

In the figure, pulse shaping sections 7-1 and 7-2 are for shaping the waveforms of the signals amplified by the amplifiers 6-1 and 6-2, respectively.

In the figure, the level detecting sections 8-1 and 8-2 convert the signals whose waveforms have been shaped by the pulse shaping sections 7-1 and 7-2, respectively, into binary signals (signals consisting of "1" or "0"). ).
The conversion may include, for example, setting a threshold at a predetermined level;
This is done by giving "1" to a signal with an amplitude larger than the threshold level, and giving "0" to a signal with an amplitude smaller than the threshold level.

In the figure, the frequency discriminator 9 is the pulse shaping section 7-
This is for discriminating the frequencies contained in the signals supplied from 1 and 7-2. For example, the chiyoke 3-1, 3-2, 3-3 or the blackboard eraser 4
is used to detect frequencies ₁ , ₂ , _3, or _0, respectively.

In the figure, the XY coordinate detection section 10 is the level detection section 8.
This is for calculating the X coordinate based on the respective signals notified from -1 and 8-2. The calculation of the XY coordinates is performed in a matrix form when writing characters, etc. on the electronic blackboard 1 using the chalkboard 3-1 or 3-3, or when erasing the written characters, etc. using the blackboard eraser 4. By scanning the sense lines placed in 2-1 and 2-2 using multiplexers 2-1 and 2-2, the signal (signal with frequency ₀ to ₃ ) is obtained in the form of the XY coordinates of the intersection of the detected sense lines. .

A color information detection section 11 in the figure is for calculating color information of written characters and the like based on the frequencies discriminated by the frequency discriminator 9. The color information is calculated by referring to a predetermined table corresponding to the frequencies discriminated by the frequency discriminator 9. For example, frequencies ₁ , ₂ and ₃ are red (R) and green, respectively.
(G) and blue (B) are searched. Also, the frequency
₀ will be searched as meaning blackboard eraser.

In the figure, the video circuit 12 is the XY coordinate detection section 10.
This is for storing information such as colored characters in the image memory 13 based on the XY coordinate information notified from the color information detection section 11 and the color information notified from the color information detection section 11. Information such as the stored characters is
This corresponds to colored characters written on the electronic blackboard 1.

A display 14 in the figure is for displaying information such as colored characters stored in the image memory 13.

By employing the above configuration, characters written on the electronic blackboard 1 using the colored chalks 3-1 to 3-3 are stored in the image memory 13 in real time and displayed on the display 14. will be displayed. Further, if necessary, by erasing colored characters written on the electronic blackboard 1 using the blackboard eraser 4, the characters stored in the image memory 13 can be erased.

FIG. 2 shows the case where characters, etc. are written on the electronic blackboard 1 using the yoke 3-1, etc.
2 is an operation explanatory diagram illustrating an operation in which a frequency signal radiated from an oscillator built in the device is detected.

The detected waveform shown in FIG. 2A is a signal of frequency ₁ , etc. emitted from the station 3-1, etc., is detected by the sense line, and the pulse shaping section 7-1, 7 in FIG.
-2 shows the formatted version. The detected waveforms correspond to signals of various frequencies oscillated by oscillators built in the chalkboards 3-1 to 3-3, the blackboard eraser 4, and the like.

The illustrated discrimination frequencies ₀ to ₃ in FIG. 2B to FIG.
It shows what is radiated from the oscillators built in the cheese yokes 3-1 to 3-3. The frequency discrimination is
This is done by providing a tuning circuit tuned to each frequency or a frequency filter with good selection characteristics.

By discriminating the frequency of the signal detected by the sense line as described above, it is possible to determine the type of color of the yoke, and it is also possible to determine whether it is a blackboard eraser or the like. In addition, as mentioned above, the X
The position at which a character or the like is written can be detected depending on at which position the signal is detected with respect to the direction and the Y direction.

〔Effect of the invention〕

As explained above, according to the present invention, letters, etc. are written on an electronic blackboard in which sense lines etc. are embedded using a chiyoke having a built-in oscillator that oscillates a frequency corresponding to the color, and the positional information of the letters, etc. and the color Information is detected in the form of electrical signals and stored in an image memory, and colored characters written on the electronic blackboard are erased using a blackboard eraser with a built-in oscillator. Since the corresponding information stored in the . You can erase the characters that are displayed.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of one embodiment of the present invention, and FIG. 2 is an operation explanatory diagram for explaining the operation of the configuration of one embodiment of the present invention shown in FIG. 1. In the figure, 1 is an electronic whiteboard, 2-1 and 2-2 are multiplexers, 3-1 and 3-3 are chiyoke,
4 is a blackboard eraser, 5-1 and 5-2 are band pass filters, 6-1 and 6-2 are amplifiers, and 7-
1 and 7-2 are pulse shaping sections, 8-1 and 8-2 are level detection sections, 9 is a frequency discriminator, 10 is an XY coordinate detection section, 11 is a color information detection section, 12 is a video circuit, and 13 is an image Memory, 14 represents a display.

Claims (1)

[Claims] 1. In an electronic blackboard device that converts characters, etc. written on an electronic blackboard into the form of image signals, a plurality of sensors are embedded in the electronic blackboard in the vertical and horizontal directions, and a signal detected by the sensor is embedded in the electronic blackboard. a frequency discriminator for discriminating a predetermined frequency signal from the sensor; a scanning device for scanning the signals detected by each of the sensors; and a plurality of embedded sensors among the signals scanned by the scanning device. a coordinate detection unit that determines from which position a signal is detected; and a coordinate detection unit that determines from which position a signal is detected; writing characters, etc. on the electronic blackboard using a writing instrument that is equipped with an image memory that stores image signals corresponding to characters, etc. written on the board, and has a built-in oscillator that generates a unique frequency signal corresponding to the type of color; In this case, an image signal including a frequency signal and position information corresponding to the color of the character, etc. is stored in the image memory, and on the other hand, a blackboard eraser with a built-in oscillator that generates a predetermined frequency signal different from that of the writing instrument is used. When characters, etc. written on the electronic blackboard are erased, a frequency signal and position information of the blackboard eraser are detected, and an image signal corresponding to the erased characters, etc. is erased from the image memory based on the frequency signal and position information of the eraser. An electronic whiteboard device featuring: