JP2002278703A - Information input device and electronic blackboard system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic blackboard system by which operability similar to that of a normal blackboard is obtained without requiring knowledge of electronic blackboard software and to be used in the same handling method as that of the blackboard by anyone. SOLUTION: The electronic blackboard system is provided with an information input device 104 to detect a prescribed object O to instruct a two-dimensional information input area 1a and to output the object as inputted information and a color discriminating means to discriminate a color of the detected prescribed object O and characters are plotted by the color of the prescribed object O discriminated by the information input device 104. Thus, since a plotting color is automatically selected by the color of the selected prescribed object O when the characters are plotted, the similar operability as that of the normal blackboard is obtained without requiring the knowledge of the electronic blackboard software and anyone can use the electronic blackboard system 100 by the same handling method of that of the blackboard by anyone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an information input device and an electronic blackboard system.

[0002]

2. Description of the Related Art Conventionally, handwritten information written on a writing surface such as a whiteboard or a writing sheet by using a writing instrument is read by a dedicated scanner and output to recording paper by a dedicated printer. Blackboard devices are known. On the other hand, in recent years, an electronic blackboard system has been provided in which an information input device is arranged on a writing surface of an electronic blackboard, and information written by hand on the writing surface can be input to a computer in real time. ing.

[0003] For example, a soft board manufactured by Microfield Graphics, Inc. (Microfield Graphics, Inc.) is configured by arranging an information input device on a whiteboard, and characters and pictures written on the whiteboard are used. It is a device that enables real-time visual data to be imported into a computer. In an electronic blackboard system configured using this software board, visual data captured by the software board is input to a computer and a CRT is used.
(Cathode Ray Tube), display on a large screen using a liquid crystal projector, output to recording paper by a printer, and the like. Further, it is also possible to project a screen of a computer to which the software board is connected on the software board with a liquid crystal projector and to operate the computer on the software board.

Further, a display device for displaying characters and images, an information input device having a coordinate input surface (touch panel surface) disposed on a display surface of the display device, and a display device based on an input from the information input device And an electronic blackboard system comprising a display surface and a writing surface of the electronic blackboard using the display device and the information input device.

[0005] For example, a Smart 2000 manufactured by SMART Technologies Inc. uses a liquid crystal projector connected to a computer to project characters, pictures, figures, and graphics onto the panel. The information input device (writing surface) arranged on the display surface of the projection surface (display surface) is used to perform a process of taking the handwritten information into the computer. Then, the handwritten information and the image information are combined in the computer, and can be displayed again in real time via the liquid crystal projector.

[0006] In such an electronic blackboard system, an image input using the information input device can be displayed as an overwrite image on an image on the screen displayed by the display device. It is widely used in educational sites and the like, and its use effect is highly evaluated. The electronic blackboard system is also used as an electronic conference system by incorporating a communication function such as voice and image into the electronic blackboard system and connecting remote locations with a communication line.

By the way, as a method of switching colors of characters and pictures in the conventional electronic blackboard system, various operations are performed on the display device by the function of electronic blackboard software which is application software incorporated in the control device of the electronic blackboard system. There is a type in which a toolbar in which a plurality of buttons for performing the operation are arranged is displayed, and the color is switched by operating the user to each button assigned to the displayed toolbar. In addition, the buttons assigned to the toolbar include pen buttons for each color that allows you to select the drawing mode in which you can write by hand by specifying the color of characters and pictures, as well as handwritten letters and pictures. An eraser button for selecting an erase mode that can be erased is also included.

[0008]

However, with the spread of personal computers and the like, the above-described electronic blackboard system has been positioned as a powerful tool for inputting and displaying information. However, there are still many issues that need to be solved for full-scale commercialization.

First, when the color of a drawing line is changed, a troublesome operation such as a toolbar icon → pull-down menu → dialog box is required. Performing this operation requires basic knowledge of electronic blackboard software. Such an electronic blackboard system is intended for use in an unspecified number of people in a conference room or the like, but many people do not have knowledge of electronic blackboard software. There is a problem that the change function of the user cannot be used much.

Second, when erasing a part drawn by mistake, a troublesome operation such as a toolbar icon → pull-down menu → dialog box is required. This operation also requires basic knowledge of electronic blackboard software.

Third, when drawing ruled lines (vertical and horizontal lines), cumbersome operations such as toolbar icon → pull-down menu → dialog box are required. This operation also requires basic knowledge of electronic blackboard software.

Fourth, when a straight line is drawn, a troublesome operation of a toolbar icon → pull-down menu → dialog box is required. This operation also requires basic knowledge of electronic blackboard software.

Fifth, even when drawing a circle, cumbersome operations such as a toolbar icon → pull-down menu → dialog box are required. This operation also requires basic knowledge of electronic blackboard software.

Sixthly, in the case of filling and drawing, a troublesome operation such as a toolbar icon → pull-down menu → dialog box is required. This operation also requires basic knowledge of electronic blackboard software.

That is, in order to use the electronic blackboard system in which the display surface and the writing surface of the electronic blackboard are configured using the display device and the information input device, knowledge of the electronic blackboard software is required, and no one has operated a personal computer. There is a disadvantage that even those who do not have knowledge of electronic blackboard software cannot use it.

An object of the present invention is to provide the same operability as a normal blackboard without requiring knowledge of electronic blackboard software,
An object is to provide an electronic blackboard system that anyone can use in the same manner as a blackboard.

[0017]

The information input device according to the present invention detects the predetermined object pointing to the two-dimensional information input area and outputs the detected object as input information. It is characterized by comprising color identification means for identifying the color of the predetermined object.

According to a second aspect of the present invention, there is provided the electronic blackboard system, wherein the information input device is provided with a display device and an information input area aligned with a display surface of the display device. A control device that performs display control of the display device based on an input from the device, and an electronic blackboard system comprising: identifying a color of the detected predetermined object;
Characters are drawn in the color of the predetermined object.

According to a third aspect of the present invention, there is provided an electronic blackboard system, wherein the information input device is provided with a display device and an information input area aligned with a display surface of the display device. A control device that performs display control of the display device based on an input from the device, and an electronic blackboard system comprising: identifying a color of the detected predetermined object;
When the color of the predetermined object is a specific color corresponding to the drawing erasure function, it is considered that drawing erasure has been instructed, and the drawing at the position specified by the predetermined object is erased.

According to a fourth aspect of the present invention, there is provided an electronic blackboard system according to the first aspect of the present invention, wherein the information input area is disposed on the display surface of the display device so as to match an information input area. A control device that performs display control of the display device based on an input from the device, and an electronic blackboard system comprising: identifying a color of the detected predetermined object;
If the color of the predetermined object is a specific color corresponding to the ruled line drawing function, it is regarded that ruled line drawing has been instructed, and a horizontal line corresponding to coordinates at the time of instruction end is drawn from coordinates input at the start of the instruction, or A vertical line corresponding to the coordinates at the end of the instruction is drawn from the coordinates input at the start of the instruction.

According to a fifth aspect of the present invention, there is provided an electronic blackboard system according to the first aspect, wherein the information input device is arranged so that an information input area is aligned with a display surface of the display device. A control device that performs display control of the display device based on an input from the device, and an electronic blackboard system including the color of the detected predetermined object,
If the color of the predetermined object is a specific color corresponding to the straight line drawing function, it is regarded that straight line drawing has been instructed, and a straight line corresponding to the coordinates at the end of the instruction is drawn from the coordinates input at the start of the instruction. Features.

According to a sixth aspect of the present invention, there is provided an electronic blackboard system according to the first aspect of the present invention, wherein the information input area is arranged on the display surface of the display device so as to match the information input area. A control device that performs display control of the display device based on an input from the device, and an electronic blackboard system comprising: identifying a color of the detected predetermined object;
If the color of the predetermined object is a specific color corresponding to the circle drawing function, it is considered that a circle drawing has been instructed, and the distance from the coordinate input at the start of the instruction of the predetermined object to the nearest indicated coordinate is determined. It is characterized in that circles are sequentially drawn.

According to a seventh aspect of the present invention, there is provided an electronic blackboard system according to the first aspect of the present invention, wherein the information input area is disposed on the display surface of the display device so as to match an information input area. A control device that performs display control of the display device based on an input from the device, and an electronic blackboard system comprising: identifying a color of the detected predetermined object;
If the color of the predetermined object is a specific color corresponding to the fill drawing function, it is considered that the fill drawing has been instructed, and if there is a drawing line at the designated position of the predetermined object,
The portion surrounded by the drawing line is painted in the same color as the drawing line.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a system configuration diagram showing an electronic blackboard system 100 according to the present embodiment. As shown in FIG. 1, an electronic blackboard system 100 according to the present embodiment includes a display device 101 which is a large-screen PDP (Plasma Display Panel), and a lower right and a lower left of a display surface 101a of the display device 101, respectively. An optical system for detecting a predetermined object O such as a pen and a finger on the display surface 101a of the display device 101 (a retroreflective system, a retroreflective system, a retroreflective system having a rotary scanning system, and a rotary scanning system) is provided. Information input device 104 having a coordinate detection device 1 of a retroreflective method, a camera imaging method, etc.) and a coordinate input unit 6 for detecting the position coordinates of the predetermined object O detected by the coordinate detection device 1
And a host P which is a control device for controlling display contents displayed on the display device 101 based on the position coordinates of the predetermined object O.
C (Personal Computer) 103.

First, each coordinate detecting device 1 will be described. The coordinate detection device 1 includes a display surface 101 of the display device 101.
a two-dimensional information input area 1a is formed on the display surface 101a of the display device 101,
A predetermined object O such as a finger is detected, and the detected predetermined object O is sent to the coordinate input control device 102.

In addition, the information input device 104 of the electronic blackboard system 100 is provided with a CCD camera 2 which captures an image of an object that comes into contact with the display surface 101a of the display device 101 and converts the image data. It is sent to the coordinate input control device 102. Here, FIG. 2 is a vertical sectional side view showing an installation state of the CCD camera 2. As shown in FIG. 2, the CCD camera 2 includes a hatched portion (display device 1).
01 (a range of several centimeters from the display surface 101a). This makes it possible to determine the color of the tip of the predetermined object O (the pen tip when the predetermined object O is a pen).

Next, a description will be given of the coordinate input control device 102 for transmitting the position coordinates of the predetermined object O detected by the coordinate detection device 1 and the color of the pen tip of the predetermined object O photographed by the CCD camera 2. Coordinate input control device 102
Is a computer configuration including a CPU (Central Processing Unit) 3. The CPU 3 includes an RGB output unit 4, an image input unit 5, a coordinate input unit 6, and a host I / F provided in the coordinate input control device 102. The section 7 controls each section of the RGB input section 8. The operation of each unit controlled by the CPU 3 will be briefly described below.

The RGB output unit 4 displays and outputs the image data input via the RGB input unit 8 to the display device 101.

The image input unit 5 inputs image data captured by the CCD camera 2, and a tip portion of a predetermined object O on the display surface 101a of the display device 101 (a pen tip when the predetermined object O is a pen). Detect the color of. Here, a color identification unit is realized.

The coordinate input unit 6 sets the origin (0, 0) at the upper left of the display surface 101a of the display device 101, and based on a predetermined object O on the display surface 101a of the display device 101 sent from the coordinate detection device 1, The position coordinates (X, Y) of the predetermined object O are detected based on, for example, the principle of triangulation.

The host I / F unit 7 is provided with an RS232C, US
B, a predetermined object O
The color of the tip portion (the pen tip when the predetermined object O is a pen) and the position coordinates (X, Y) of the predetermined object O are transmitted.

Next, the host PC 103 connected to the coordinate input control device 102 via the host I / F 7 will be described. The host PC 103 includes a touch panel driver 9, an image memory 10, and a drawing control program 11. The touch panel driver 9 sends a tip of a predetermined object O from the coordinate input control device 102 (a pen when the predetermined object O is a pen). And the position coordinates (X, Y) of the predetermined object O are received and passed to the drawing control program 11. The drawing control program 11 is electronic blackboard software that executes drawing on the image memory 10 based on the input color and position coordinates (X, Y) of the predetermined object O, or Delete the drawn image.

Here, the characteristic functions executed by the drawing control program 11 of the host PC 103 will be described.
Here, FIG. 3 is a front view showing a display screen of the display device 101 when the drawing control program 11 is being executed. As shown in FIG. 3, when the electronic blackboard system 100 is used as an electronic blackboard, no toolbar or the like is displayed on the display surface 101a of the display device 101, and only a so-called blackboard screen A is displayed. On such a blackboard screen A, drawing is performed by operating the attached pen which is the predetermined object O, and erroneous drawing portions are erased by operating the attached blackboard which is the predetermined object O. Note that when executing APL software other than the drawing control program 11 which is electronic blackboard software executed under the host PC 103, “Con
By simultaneously operating the “control” key, the “Alt” key, and the “R” key, it is possible to return to the APL start screen provided by the OS (Operating System).

Next, the function of pen function setting realized by the drawing control program 11 will be described with reference to the pen function setting screen of FIG. The pen function setting is executed by displaying a dialog box B as shown in FIG. 4 on the display device 101 and operating this dialog box. By operating this dialog box B, the color and thickness of a pen (blackboard eraser) that executes functions other than the character drawing pen are set. The setting of such a pen function is set in advance by, for example, an electronic blackboard administrator or the like.

Next, such an electronic blackboard system 100 will be described.
Will be described with reference to a flowchart shown in FIG. 5 and an explanatory diagram exemplarily showing a drawing / erasing state shown in FIG.

The coordinates (X1, Y1) shown in FIG. 6 indicate the coordinates at the start of the touch (instruction) of the pen (blackboard eraser) as the predetermined object O, and the coordinates (( X2, Y2), (X3, Y3), (X4, Y
4),...) Are sequentially input.

FIG. 6 shows a character drawing state, in which the color of the pen detected based on the image data photographed by the CCD camera 2 and the thickness set for the pen of the color are shown. By sequentially drawing a straight line between the coordinates,
Character drawing is performed. In this case, since the coordinate detection interval is on the order of several millimeters, character drawing is performed according to the locus of the pen. In other words, when drawing characters, the drawing color is automatically selected according to the color of the selected pen, so that operability similar to a normal blackboard is obtained without requiring knowledge of electronic blackboard software, It can be used in the same way as a blackboard.

FIG. 6 shows a ruled line drawing state. Ruled line drawing is executed on condition that a pen of the color for the ruled line drawing pen set in the dialog box B is selected. The determination as to whether or not the pen of the color for the ruled line drawing pen is selected is made based on the pen color detected based on the image data captured by the CCD camera 2. Such a ruled line drawing is performed by fixing a Y coordinate of the coordinates (X1, Y1) input at the start of the touch, and connecting a straight line between the X coordinates of each coordinate sequentially input, or a coordinate input at the start of the touch. The X-coordinate of (X1, Y1) is fixed, and a vertical line connecting the Y-coordinates of the respective coordinates sequentially input with a straight line is a pen color detected based on the image data captured by the CCD camera 2, the color of the pen. The ruled line is expressed by drawing with the thickness set for the pen or a predetermined color or thickness. That is, when drawing a ruled line, a ruled line drawing can be performed by selecting a ruled line drawing pen, so that the computer operation feeling by displaying a dialog box or the like is eliminated, and anyone can easily draw the ruled line.

FIG. 6 shows a straight line drawing state. The straight line drawing is executed on condition that a pen of the color for the straight line drawing pen set in the dialog box B is selected. The determination as to whether or not the pen of the color for the straight line drawing pen is selected is made based on the pen color detected based on the image data captured by the CCD camera 2. Such a straight line drawing is performed by fixing the direction of a straight line from the coordinates (X1, Y1) input at the start of the touch and the next coordinates (X2, Y2) and obtaining the Y from the input X coordinate and the vector direction (θ). The coordinates are determined, and the color of the pen detected between two points based on the image data captured by the CCD camera 2, the thickness set for the pen of the color, or a predetermined color or thickness is determined. By drawing by drawing, a straight line is represented. FIG. 7 shows a method of calculating the vector direction (θ) and the Y coordinate when drawing a straight line. In other words, in straight line drawing, straight line drawing can be performed by selecting a straight line drawing pen, so that the feeling of computer operation by displaying a dialog box or the like is eliminated, and anyone can easily perform straight line drawing.

FIG. 6 shows a state of drawing a circle.
Circle drawing is executed on condition that a pen of a color for the circle drawing pen set in the dialog box B is selected. The determination as to whether or not the pen of the color for the circle drawing pen is selected is made based on the pen color detected based on the image data captured by the CCD camera 2. In such a circle drawing, the coordinates (X
1, Y1) and the current coordinates (X, Y) from the radius R (R = √
^(X-X1) calculates 2 + a ^{(Y-Y1) 2),} a circle centered in the current coordinates (X, Y) of the circle, the pen that is detected based on the image data captured by the CCD camera 2 The color, the thickness set in the pen of the color, or the predetermined color and thickness are sequentially drawn. Since the circle is sequentially drawn each time the designated position is changed, the old circle drawing portion is returned to the background color of the blackboard screen A each time the designated position is changed. FIG. 8 shows an example of a circle drawing. In other words, when drawing a circle, a circle can be drawn by selecting a circle drawing pen, so that a computer operation feeling by displaying a dialog box or the like is eliminated, and anyone can easily draw a circle.

FIG. 6 shows a state of erasing a drawing portion. The drawing part erasing is executed on condition that the blackboard erasing of the color for drawing part erasing set in the dialog box B is selected. The determination as to whether the blackboard eraser of the color for erasing the drawing portion is selected is made based on the blackboard eraser color detected based on the image data captured by the CCD camera 2. To erase such a drawing portion, a dotted line is sequentially drawn between the coordinates, and if there is drawing coordinates that match the coordinates of the portion surrounded by the dotted line (see FIG. 6), this is replaced with the background color of the blackboard screen A. Thus, the drawing is erased. The drawing coordinates are stored together with the line type, thickness, color, and the like at the time of drawing. In other words, when erasing a part of the drawing, the drawing is automatically erased according to the color of the selected blackboard eraser, so that operability similar to that of a normal blackboard is obtained without requiring knowledge of the electronic blackboard software. However, it can be used in the same way as a blackboard.

Although not particularly shown, it is also possible to execute a fill drawing by selecting a fill pen. If there is a drawing line at the position indicated by the fill pen, the portion surrounded by the drawing line is displayed. By painting with the same color as the drawing line, the feeling of operating the computer by displaying a dialog box or the like is eliminated, and anyone can easily paint and draw.

In the present embodiment, the present invention is applied to the information input device 104 having the optical coordinate detecting device 1 for calculating the designated position by the triangulation method, but the present invention is limited to these methods. Not something, for example L
It goes without saying that the present invention is applied to all information input devices including the ED array method, ultrasonic elastic wave method, analog capacitive coupling method, pressure-sensitive method, and the like.

[0045]

According to the information input device of the present invention, in the information input device for detecting a predetermined object pointing to a two-dimensional information input area and outputting the same as input information, the detected predetermined object By providing the color identification means for identifying the color of the object, if the color of the predetermined object is changed, various kinds of information can be switched according to the color information, so that the work efficiency can be improved.

According to the electronic blackboard system of the second aspect of the present invention, the information input device according to the first aspect, wherein the display device and the information input area are arranged on the display surface of the display device so as to coincide with each other. A control device for performing display control of the display device based on an input from an information input device, the electronic blackboard system comprising: identifying a color of the detected predetermined object; By drawing, when drawing a character, the drawing color is automatically selected according to the color of the selected predetermined object, so that operability similar to that of a normal blackboard is obtained without requiring knowledge of electronic blackboard software. Anyone can use it in the same way as a blackboard.

According to the electronic whiteboard system of the third aspect of the present invention, the information input device according to the first aspect, wherein the display device and the information input area are arranged on the display surface of the display device so as to coincide with each other. A control device for performing display control of the display device based on an input from an information input device, wherein the color of the detected predetermined object is identified, and the color of the predetermined object is drawn and erased. In the case of the specific color corresponding to the function, it is considered that the drawing erasure has been instructed, and the drawing at the position designated by the predetermined object is erased. Since the drawing is automatically erased by the color of the predetermined object, which is the specific color corresponding to, the operability similar to a normal blackboard is obtained without the need for knowledge of the electronic blackboard software, and anyone can handle it in the same way as a blackboard One It can be used.

According to the electronic blackboard system of the fourth aspect of the present invention, the information input device according to the first aspect, wherein the display device and the information input area are arranged on the display surface of the display device in accordance with each other. A control device for performing display control of the display device based on an input from an information input device, the electronic blackboard system identifies a color of the detected predetermined object, and draws a ruled line color of the predetermined object. In the case of a specific color corresponding to the function, it is considered that ruled line drawing has been instructed, and a horizontal line corresponding to the coordinate at the end of the instruction is drawn from the coordinates input at the start of the instruction, or the coordinates input at the start of the instruction By drawing a vertical line corresponding to the coordinates at the end of the instruction, the ruled line can be drawn by selecting a predetermined object of a specific color corresponding to the ruled line drawing function. To eliminate the computer operation feeling due to the display of the box, anyone can perform the borders drawn easily.

According to the electronic blackboard system of the fifth aspect of the present invention, the information input device according to the first aspect, wherein the display device and the information input area are arranged on the display surface of the display device so as to coincide with each other. A control device for performing display control of the display device based on an input from an information input device, wherein the color of the detected predetermined object is identified, and the color of the predetermined object is drawn in a straight line. In the case of a specific color corresponding to the function, it is considered that a straight line drawing has been instructed, and by drawing a straight line corresponding to the coordinates at the end of the instruction from the coordinates input at the start of the instruction, Straight lines can be drawn by selecting a predetermined object of a specific color that corresponds to the straight line drawing function, eliminating the feeling of computer operation by displaying dialog boxes and making it easy for anyone to draw straight lines. Kill.

According to the electronic blackboard system of the invention described in claim 6, the information input device according to claim 1, wherein the display device and the information input area are arranged on the display surface of the display device so as to coincide with each other. A control device for performing display control of the display device based on an input from an information input device, the electronic blackboard system identifies the color of the detected predetermined object, and draws a circle of the color of the predetermined object. In the case of a specific color corresponding to the function, it is considered that a circle drawing has been instructed, and by sequentially drawing circles according to the distance from the coordinates input at the start of the instruction of the predetermined object to the nearest indicated coordinates, When drawing a circle, you can draw a circle by selecting a specific object of a specific color corresponding to the circle drawing function, eliminating the feeling of computer operation such as displaying a dialog box,
Anyone can easily draw a circle.

According to the electronic blackboard system of the present invention, the information input device according to claim 1, wherein the information input area is arranged on the display surface of the display device so as to coincide with the information input area. An electronic blackboard system comprising: a control device that performs display control of the display device based on an input from an information input device, wherein the color of the detected predetermined object is identified, and the color of the predetermined object is painted out. In the case of a specific color corresponding to the function, it is considered that a solid drawing has been instructed, and if there is a drawing line at the designated position of the predetermined object, the portion surrounded by the drawing line is the same color as the drawing line By filling with, in the case of filling drawing,
Since the fill drawing can be performed by selecting a predetermined object of a specific color corresponding to the fill drawing function, the feeling of operating the computer by displaying a dialog box or the like is eliminated, and anyone can easily perform the fill drawing.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram illustrating an electronic blackboard system according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing an installation state of a CCD camera.

FIG. 3 is a front view showing a display screen of a display device when a drawing control program is executed.

FIG. 4 is a front view showing a pen function setting screen.

FIG. 5 is a flowchart schematically showing a flow of a drawing / erasing process.

FIG. 6 is an explanatory view exemplarily showing a drawing / erasing state.

FIG. 7 is an explanatory diagram showing a method of calculating a vector direction (θ) and a Y coordinate when drawing a straight line.

FIG. 8 is an explanatory diagram illustrating an example of a circle drawing.

[Explanation of symbols]

 1a Information input area 100 Electronic blackboard system 101 Display device 101a Display surface 103 Control device 104 Information input device

Claims (7)

[Claims] 1. An information input device for detecting a predetermined object indicating a two-dimensional information input area and outputting the detected information as input information, comprising: a color identification means for identifying a color of the detected predetermined object. Information input device. 2. The information input device according to claim 1, wherein the information input region is arranged on the display device so that the information input area is coincident with the display surface of the display device, and the display device based on an input from the information input device. An electronic blackboard system comprising: a control device for performing display control of (1), wherein a color of the detected predetermined object is identified and a character is drawn in the color of the predetermined object. 3. An information input device according to claim 1, wherein the information input region is arranged on the display device so as to coincide with an information input area, and the display device is provided based on an input from the information input device. An electronic blackboard system comprising: a control device for performing display control of: identifying a color of the detected predetermined object, and erasing the drawing if the color of the predetermined object is a specific color corresponding to a drawing erasure function. Is regarded as being instructed, and the drawing at the position instructed by the predetermined object is erased. 4. The information input device according to claim 1, wherein the display device is provided with an information input area coincident with a display surface of the display device, and the display device is provided based on an input from the information input device. An electronic blackboard system comprising: a control device that performs display control of: (a) identifying a color of the detected predetermined object; and, if the color of the predetermined object is a specific color corresponding to a rule drawing function, drawing a ruled line. Is assumed to have been instructed, and a horizontal line corresponding to the coordinates at the end of the instruction is drawn from the coordinates input at the start of the instruction, or a vertical line corresponding to the coordinates at the end of the instruction from the coordinates input at the start of the instruction. An electronic blackboard system characterized by drawing. 5. An information input device according to claim 1, wherein the information input region is arranged on the display surface of the display device so as to match the information input region, and the display device is provided based on an input from the information input device. A control device for performing display control of the electronic blackboard system, wherein the color of the detected predetermined object is identified, and if the color of the predetermined object is a specific color corresponding to the linear drawing function, a linear drawing is performed. An electronic blackboard system, which considers that an instruction has been given, and draws a straight line corresponding to the coordinates at the end of the instruction from the coordinates input at the start of the instruction. 6. An information input device according to claim 1, wherein the information input region is arranged on the display surface of the display device in accordance with the information input device, and the display device is provided based on an input from the information input device. An electronic blackboard system comprising: a control device that performs display control of a predetermined object, wherein the color of the detected predetermined object is identified, and when the color of the predetermined object is a specific color corresponding to the circle drawing function, a circle drawing is performed. An electronic blackboard system, which considers that a designated object has been designated, and sequentially draws circles according to the distance from the coordinates input at the start of the designation of the predetermined object to the nearest designated coordinates. 7. The information input device according to claim 1, wherein the display device is provided with an information input area coincident with a display surface of the display device, and the display device is provided based on an input from the information input device. A control device for performing display control of the electronic blackboard system, wherein the color of the detected predetermined object is identified, and when the color of the predetermined object is a specific color corresponding to a solid color drawing function, the solid color drawing is performed. The electronic blackboard system is characterized in that, when there is a drawing line at the pointing position of the predetermined object, a portion surrounded by the drawing line is painted in the same color as the drawing line.