JPH1170780A - Electronic writing boad device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the dealing with the color printing by a method wherein the information read at a reading part is outputted in predetermined colors onto a recording paper. SOLUTION: The light incident upon an image sensor 12 is resolved into color signals of RGB primaries and converted into multivalued digital data in every color at an A/D converter 13 and then outputted to a shading correction circuit 14, in which the scattering of the sensitivity of received light of the image sensor 12 is corrected and then the color signals of 3 RGB primaries in every pixel are outputted. A conversion circuit 15 judges the color of each pixel on the basis of the output signal sent from the correction circuit 14 so as to convert RGB signals to CMYK signals, which can process with a color printer in response to the results of the judgements. In a printer controlling circuit 16, a printing with the color printer 17 is executed on the basis of the CMYK signals outputted from the conversion circuit 15. The signals of additive primaries represent red in R, green in G and blue in B. Further, the signals of the three primary colors represent cyan in C, magenta in M and yellow in Y. In addition, black is represented by K.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic blackboard device capable of reading information written on a board and printing the information on a recording sheet, and more particularly to an electronic blackboard device capable of reading and printing a plurality of colors. It is about.

[0002]

2. Description of the Related Art Conventionally, an electronic blackboard device as described in Japanese Patent Publication No. 62-56000 has been widely used in a conference room of a company and the like. When such an electronic blackboard device is used, the content recorded on the board at a meeting or the like can be printed as it is on plain paper or thermal paper, and there is no need to transfer it to a notebook or the like. Since the board of the electronic blackboard device can be written and erased with a water-based marker, the recorded content on the board can be erased with an eraser after use, and the same screen can be used as a new writing surface. Further, it is possible to read not only information written by a marker but also a chart or the like attached to a board.

[0003]

However, in the above-described conventional electronic blackboard device, reading and printing are only performed in monochrome, so that information written with a marker other than black, such as red or blue, is also printed in black. There was a problem that. Further, even if a chart using a plurality of colors is read, only black-and-white printing can still be performed, and support for color printing has been strongly desired.

[0004]

In order to solve the above problems, the present invention provides a writing sheet that can be written and erased with a writing instrument, and a reading section that reads information written on the writing sheet for each color component. And a color printer that outputs information read by the reading unit in a predetermined color to recording paper.

[0005]

Embodiments of the present invention will be described below.

FIG. 1 is a perspective view of an electronic blackboard device according to an embodiment of the present invention, in which 1 is a housing of a blackboard main body, 2 is a surface exposed through an opening provided in the housing 1, A writing sheet 3 on which information can be written / erased by a writing instrument, a printer unit 3 attached to the lower part of the housing 1 and having a color printer (described later), a control unit,
Reference numeral 4 denotes an operation panel provided on the printer unit 3, reference numeral 5 denotes a tray provided with a marker or an eraser provided on the upper part of the printer unit 3, and reference numeral 6 denotes recording paper on which printing has been performed by the printer unit 3.

FIG. 2 is a block diagram of the electronic blackboard device.
Reference numerals 8 and 9 denote rollers driven by a motor (not shown) to move the writing sheet 2, 10 a light source for irradiating the writing sheet 2 with light, and 11 a reflected light of the light emitted from the light source 10 from the writing sheet 2. Mirror for reflecting light, 1
2 receives light from the reflection mirror 11, and receives R (red), G
This is a color CCD image sensor that converts into three primary color electric signals consisting of (green) and B (blue).

The information written on the writing surface of the writing sheet 2 is
As the writing sheet 2 is conveyed by the rollers 8 and 9, the writing sheet 2 is read by the light source 10, the reflection mirror 11, and the image sensor 12. The read information is converted into a signal of three primary colors of RGB and output.

FIG. 3 is a block diagram of the electronic blackboard device according to the present embodiment. In the figure, reference numeral 12 denotes the above-described image sensor, 13 denotes an A / D converter for converting an analog electric signal output from the image sensor 12 into an 8-bit digital signal from analog to digital, and 14 denotes a signal from the A / D converter 13. A shading correction circuit 15 that uniformly corrects and outputs RGB color signals for each pixel based on the output. Reference numeral 15 denotes RGB (primary) RGB signals output from the shading correction circuit 14 as C (cyan), M (magenta), and Y ( yellow),
A conversion circuit 16 for converting into a K (black) signal is a printer control circuit for causing a color printer 17 to perform printing based on an output from the conversion circuit 15 by an ink jet system or the like. The color printer 17 records “0” or “1” for each color of CMYK, and can perform color printing of a total of eight colors by combining four colors of CMYK.

Therefore, for example, the output signals (C, M, Y,
K) is (0,0,0,1) black, (0,1,1)
Printing is performed in red for (1,0), green for (1,0,1,0), and blue for (1,1,0,0).

The operation of the electronic blackboard device according to the present embodiment configured as described above will be described below.

The writing sheet 2 on which information is written with a marker or the like is transported by the rotation of the rollers 8 and 9. At that time, light is emitted to the surface of the writing sheet 2 by the light source 11, and the reflected light is incident on the image sensor 12 via the reflection mirror 11. The light incident on the image sensor 12 is decomposed into color signals of three primary colors of RGB, and A / D
After being converted into multivalued digital data for each color by the converter 13, the digital data is output to the shading correction circuit 14. The shading correction circuit 14 corrects a variation in light amount of the light source 11 and a variation in light receiving sensitivity of the image sensor 12,
The color signals of the three primary colors RGB are output for each pixel.

The conversion circuit 15 determines the color of each pixel based on the output signal from the shading correction circuit 14,
In accordance with the result, the RGB signals are converted into CMYK signals that can be processed by a color printer. Then, in the printer control circuit 16, the CMYK output from the conversion circuit 15 is output.
The printing is executed by the color printer 17 based on the signal of (1).

Here, the processing in the conversion circuit 15 will be described with reference to the flowchart of FIG.

First, in step 1, data of one pixel output from the shading correction circuit 14 is obtained, and the level of each RGB color signal is checked. If all the levels of RGB are equal to or higher than a predetermined value (for example, 150 or higher when the output signal from the shading correction circuit 14 is 8 bits / 256 gradations), the pixel is determined to be white and the output signal (C , M, Y, K) = (0, 0, 0, 0)
Is output to the printer control circuit 16 (steps 2 and 3). In addition, all the levels of RGB are equal to or less than a predetermined value (for example, 5 bits for 8 bits / 256 gradations as described above).
0 or less), the pixel is determined to be black, and an output signal (C, M, Y, K) for printing black = (0, 0, 0,
1) is output to the printer control circuit 16 (steps 4 to 4).
Step 5). If the pixel is not white or black, then in step 6 the pixel is red, blue,
It is determined which color is green. Specifically, RGB
The level of each signal of the three primary colors is compared, and the signal with the highest level is detected. When the R signal is the maximum, the pixel is determined to be red, and the output signal (C, M, Y,
K) = (0, 1, 1, 0) is output. When the G signal is maximum, the pixel is determined to be green, and an output signal (C, M, Y, K) = (1, 0, 1, 0) for printing green is output. Further, when the B signal is the maximum, the pixel is determined to be blue, and the output signal (C, M, Y,
K) = (1,1,0,0) is output.

The above processing is performed by the shading correction circuit 14.
This is performed for all pixels output from.

As described above, in the present embodiment, color printing can be performed in the electronic blackboard apparatus, and even if there is uneven writing at the time of writing, printing can be performed in a predetermined color corresponding to the marker without unevenness. Further, even if there is a color variation due to the markers, since they are printed in a predetermined color, there is no need to use extra ink. For example, when a part written with a blue marker is read, even if a Y (yellow) component is included, the component is ignored and output as a mixed color of C (cyan) and M (magenta). By doing so, it is possible to correct the variation in color when printing, and to avoid wasting ink.

[0018]

According to the present invention, high-quality color printing with less unevenness can be performed at low cost in an electronic blackboard device.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electronic blackboard device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the electronic blackboard device.

FIG. 3 is a block diagram of the electronic blackboard device.

FIG. 4 is an operation flowchart of the electronic blackboard device.

[Explanation of symbols]

 Reference Signs List 1 housing 2 writing sheet 12 image sensor 13 A / D converter 14 shading correction circuit 15 conversion circuit 16 printer control circuit 17 color printer

Claims (1)

[Claims] A writing sheet which can be written / erased by a writing instrument, a reading section for reading information written on the writing sheet for each color component, and information read by the reading section in a predetermined color. An electronic blackboard device, comprising: a color printer that outputs to a recording sheet by using a color printer.