JPH09224111A - Electronic blackboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the preparation of high-definition electronic documents by separately plotting characters, straight lines and graphics on a screen for plotting while using pens in plural colors, picking up the images of these data while using a specified image sensor, distinguishing these images, replacing these images with electronic characters and electronic straight lines, restoring and synthesizing them. SOLUTION: Characters/symbols 6, a horizontal/vertical straight line 7 and arbitrary graphic 8 are respectively handwritten in different colors on a screen 2 for plotting of an electronic blackboard 1 by pens 3-5 in red, green and blue and the images of these data are picked up by a color camera 9 provided with an optical filter for distinguishing and recognizing them corresponding to respective colors. At a red output terminal 10, for example, the output of the characters 6 is remarkable but other video signal output components are reduced. A character discriminator 13, a straight line discriminator 14 and an arbitrary graphic discriminator 15 discriminate the levels of inputs of these video signals and distinguish the characters, the straight line and the arbitrary graphic. Then, a character/graphic synthesizer 20 synthesizes the electronic character and electronic graphic generated by a character generator 17 and a straight line generator 19 with the graphic from the arbitrary graphic discriminator 15 and outputs the synthesized result from an output device 21.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a so-called electronic blackboard.

[0002]

2. Description of the Related Art Electronic blackboards have been widely used in recent years,
In many devices, handwritten characters and figures are electronically recorded as they are as graphic information to make a copy. Also, there is a device capable of outputting the electronically recorded graphic information to a personal computer, but this also simply takes in the characters and graphics handwritten on the plate surface as they are as graphic information.

[0003]

The above-mentioned prior art has an advantage that many handwritten characters and figures can be copied as they are, but the quality of handwritten characters is inferior, and this is used as an official document such as minutes. If you want to keep it, you have to recreate it with a word processor.

The present invention eliminates this drawback, and provides an electronic blackboard for converting handwritten characters and figures into high-quality characters and figures, and producing a document in which official documents such as minutes can be created as they are. To aim.

[0005]

In order to achieve this object, the present invention is capable of recognizing handwritten characters and figures and converting them into electronic characters and figures to make official documents such as minutes. It enables the creation of quality documents.

In order to convert a handwritten character or graphic into an electronic character or graphic, a character drawn in a mixed state on the drawing surface,
Since it is very difficult to recognize figures in a lump and to identify them, this is identified in advance so that characters are recognized only by characters and figures are recognized by figures.

From this point of view, when looking at a drawing document on an electronic blackboard, characters and horizontal and vertical straight lines and other figures,
It is roughly divided into three. In addition, the minutes that occupy most of the purpose of using the electronic blackboard are roughly divided into characters and symbols of a fixed size, a frame formed by horizontal and vertical straight lines, and an arbitrary figure.

In the present invention, a character,
Draw symbols, horizontal and vertical straight lines, and arbitrary figures with pens of different colors, image this with an image sensor equipped with an optical filter that distinguishes colors, and identify characters from the signals obtained by this image sensor. The device discriminates that it is a character, and then the character recognition device recognizes what character it is, and then the character generator generates an electronic character, that is, character code data.

Further, the straight line generates an electronic straight line (straight line signal) through the same process as that of the character. A handwritten symbol is figure-identified in the same manner as a character. These electronic characters, electronic straight lines, and arbitrary figures that are captured as they are can be combined into a high-quality document by the character / graphic combination device.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS.

Characters, symbols 6, horizontal and vertical straight lines 7, and arbitrary figures 8 are divided on the drawing surface 2 of the electronic blackboard 1 with pens 3, 4, and 5 of three colors of red, green, and blue. When handwritten, the image is picked up by the color camera 9 having an optical filter (not shown).

The color camera 9 takes an image of the entire drawing surface 2. The characters, symbols 6, straight lines 7 and arbitrary figure 8 drawn on the drawing surface 2 have different colors, so the red, green and blue output terminals of the color camera 9 are drawn. Regarding the video signal levels output to 10, 11, and 12, for example, the output of the character 6 is large at the red output terminal 10, but the video signal output components of the other straight line 7 and the arbitrary figure 8 are very small.

Similarly, the video signal output of the straight line 7 is large at the green output terminal 11, but the signal output of the other characters 6 and the arbitrary figure 8 is small.

Further, an arbitrary figure 8 is provided on the blue output terminal 12.
The output of the video signal is large, but the outputs of the other characters 6 and the straight line 7 are small.

Therefore, the character discriminating device 13 and the straight line discriminating device 14 and the arbitrary figure discriminating device 15 for discriminating the input and output of these video signals and outputting signals of a predetermined output level or higher are used for character, straight line, arbitrary Can distinguish figures.

The output of the character discriminating device 13 is input to the character recognizing device 16 and, after recognizing what character the handwritten character is, it is sent to the next character generating device 17.

Similarly, the output of the straight line discriminating device 14 is input to the graphic discriminating device 18 to recognize the length of the straight line in which direction and then to the next straight line generating device 19.

The electronic characters and electronic figures generated by the character generator 17 and the straight line generator 19 are sent to the next character / figure synthesizer 20, and at the same time synthesized with the figure sent from the arbitrary figure discriminating device 15 to obtain a high quality image. An electronic document is created and output from the output device 21.

As shown in FIG. 2, the drawing surface 2 has
An auxiliary line 22 for writing the handwritten character 6 so that it can be easily recognized by the character recognition device, which is not detected by the color camera 9 but visible to the human eye, and an auxiliary line 23 for drawing the handwritten straight line 7 are entered. Has been done.

With this auxiliary line, the recognition rate of characters and straight lines is increased, and a high-quality electronic document can be efficiently created.

[0021]

As described above, according to the present invention, if a handwritten document is written on the electronic blackboard, a high-quality electronic document can be automatically created, so that the business efficiency can be remarkably improved. In addition, the use value of the electronic blackboard can be made very high.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a front view showing an example of an auxiliary line on a drawing surface of the present invention.

[Explanation of symbols]

2: Drawing surface, 3: Red pen, 4: Green pen, 5: Blue pen, 9: Color camera, 13: Character discrimination device, 14:
Straight line discriminating device, 15: arbitrary figure discriminating device, 16: character recognizing device, 17: character generating device, 18: figure discriminating device, 1
9: straight line generator, 20: character and figure synthesizer.

Claims (1)

[Claims] 1. A drawing surface, a character, a symbol, and a straight line drawn by a pen of a different color for drawing at least three of a character, a symbol, a straight line, and an arbitrary figure on the drawing surface. An image sensor equipped with an optical filter for discriminating and recognizing each figure by the color, a character recognition device connected to the image sensor, a straight line recognition device connected to the image sensor, and the character recognition device and a straight line An electronic blackboard comprising a character, a straight line, an image synthesizing device to which a recognition device and a sensor for recognizing the arbitrary image are connected, and an output device connected to the character and straight line image synthesizing device.