JP2004318360A - Handwriting input system, pen type input device, and paper used for handwriting input system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pen type input device capable of accurately distinguishing a guide marker and a detection marker previously printed on paper from each other and allowing a precise input of the shape and the position of a handwritten letter or the like. <P>SOLUTION: The detection marker 12 on the paper 11 is detected and written contents handwritten in a writing position of the paper 11 are inputted to an external apparatus. On the paper 11, the guide marker 13 showing the writing position is printed. The pen type input device includes a pen-shaped case 1, a pen 2 arranged on the tip side of the case 1, a camera 4 facing the vicinity of the tip in the pen 2 via an aperture 3 at the tip of the case 1, and a visible light eliminating filter 8 arranged in the aperture 3. The visible light eliminating filter 8 allows the transmission of an infrared ray alone. The detection marker 12 is printed in ink with high infrared ray absorptance, while the guide marker 13 is printed in ink with low infrared ray absorptance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a handwriting input system for inputting handwritten characters, graphics, and the like to an external device such as a computer, a pen-type input device, and a sheet used for the handwriting input system.
[0002]
[Prior art]
Regarding this type of handwriting input system, Patent Documents 1 to 3 disclose that a marker for detection is printed on paper in advance and handwritten on this paper with a pen-type input device, so that the camera of the pen-type input device is used for the detection. Detect the marker. The pen-type input device determines writing contents such as a shape and a position of a handwritten character on a sheet based on a detection marker and inputs the content to an external device such as a computer.
[0003]
[Patent Document 1]
JP-T-2003-500777 (Paragraph No. 0083-0087 · 0120-0124, FIGS. 3 and 6)
[Patent Document 2]
JP-T-2003-500778 (Paragraph No. 0057-0059 / 0094-0102, FIG. 1-2)
[Patent Document 3]
JP-T-2003-503905 (Paragraph Nos. 0050-0051 and 0114-0121, FIGS. 1 and 4)
[0004]
[Problems to be solved by the invention]
When the paper is used for a check or a traveler, since the writing position of the signature is predetermined, it is necessary to print a guide marker such as a ruled line or a mark indicating the writing position on the paper.
[0005]
In this case, if the pen-type input device cannot accurately distinguish between the guide marker and the detection marker, the guide marker may be erroneously detected as the detection marker, and handwritten characters or the like may not be accurately input to the external device. There is a problem somewhere.
[0006]
Therefore, an object of the present invention is to provide a handwriting input system capable of accurately distinguishing between a guide marker and a detection marker and accurately inputting the shape and position of a character or the like with a pen-type input device, a pen-type input device, And a sheet used for a handwriting input system.
[0007]
[Means for Solving the Problems]
The handwriting input system according to the present invention is intended for a pen-type input device that inputs a handwritten content at a predetermined writing position on a paper 11 to an external device by detecting a detection marker 12 printed on the paper 11. It is.
[0008]
As shown in FIGS. 1 and 2, such a pen-type input device includes a pen-shaped case 1, a pen portion 2 provided on a tip side of the case 1, an opening 3 provided on a tip end of the case 1, and an opening 3. And a camera 4 facing the periphery of the tip of the pen unit 2 through the camera, and a visible light removing filter 8 arranged in the opening 3. The visible light removing filter 8 removes visible light from input light to the camera 4 and transmits only invisible light.
[0009]
The invisible light here includes infrared light and ultraviolet light that are outside the range of visible light. The wavelength of visible light is about 0.45 to 0.70 μm. The visible light removing filter 8 is applicable if the transmittance of invisible light is higher than that of visible light.
[0010]
As shown in FIG. 3, a guide marker 13 indicating the writing position is printed on the paper 11 used in the handwriting input system. The detection marker 12 is printed with an ink having a high absorption rate of invisible light, and the guide marker 13 is printed with an ink having a low absorption rate of invisible light.
[0011]
The paper 11 includes valuable papers, such as checks, travelers, securities, and the like, which require an autograph, as well as documents that require an autograph such as an official document, an order form, a receipt, and a medical chart.
[0012]
Specifically, the visible light removing filter 8 is detachable from the opening 3 of the case 1. Here, the visible light removing filter 8 may be one that is detached from the case 1 by a screw mechanism or a slide mechanism, or one that is attached to and detached from the opening 3 without being detached from the case 1.
[0013]
The invisible light may be infrared light or ultraviolet light, but is preferably infrared light from the viewpoint of the sensitivity of the camera 4 and the like.
[0014]
Further, the detection markers 12 of the paper 11 are arranged in a dispersed state, and each of the detection markers 12 may be formed in a pattern for indicating a position.
[0015]
Effects of the Invention
According to the present invention, only the invisible light is input to the camera 4 of the pen-type input device by the visible light removal filter 8. In addition, since the detection marker 12 has a high absorptivity of invisible light and the guide marker 13 has a low absorptivity of the invisible light, the paper 11 detects the paper 11 with the guide marker 13 on the imaging screen of the camera 4. The contrast difference from the marker 12 becomes large. Therefore, the pen-type input device can reliably distinguish the guide marker 13 and the detection marker 12, and the pen-type input device can accurately input the shape and position of a handwritten character or the like.
[0016]
When the visible light removing filter 8 is detachable, the pen-type input device can detect the visible light even if it is a conventional handwriting input paper on which the detection marker 12 is printed with ink having a low absorption rate of invisible light. By removing the light beam removal filter 8 from the opening 3, the detection marker 12 can be reliably detected.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIGS. 1 and 2, the pen-type input device is provided with a pen-shaped vertically long case 1, a pen portion 2 for writing provided on the tip (lower) end side of the case 1, and a tip of the case 1. An opening 3, a camera 4 facing the tip of the pen unit 2 through the opening 3, a processor 5 for determining a handwriting on the pen unit 2 based on detection data of the camera 4, and a memory 6 for storing handwriting data and the like And a communication unit 7 for communicating with an external device, a visible light removing filter 8 disposed facing the opening 3, an infrared light emitting LED 9 provided at the tip of the case 1, and a battery 10 as an internal power supply. The camera 4, the processor 5, the memory 6, the communication unit 7, and the battery 10 are housed in the case 1.
[0018]
The case 1 has an outer diameter of 17 mm and an overall length of 150 mm, and has almost the same outer shape as a general pen.
[0019]
The pen portion 2 is mounted in a vertically long attitude near the outer periphery on the tip side in the case 1, and a pen or the like protruding out of the case 1 can write a character or the like with ink built in the special paper 11. The pen unit 2 includes a pressure sensor that detects pen pressure, and the pen pressure data is output to the processor 5 in the case 1. As shown in FIG. 3, a detection marker 12 detected by the camera 4 and a guide marker 13 formed of a ruled line are printed on the paper 11.
[0020]
The camera 4 is mounted on the distal end side in the case 1 and has an image sensor such as a CCD or a CMOS sensor, and can detect visible light and infrared light. The camera 4 detects the detection marker 12 located around the pen tip of the pen unit 2 while writing on the paper 11. The communication unit 7 provided in the case 1 communicates with an external device by radio waves or infrared rays.
[0021]
The visible light removing filter 8 is located below the camera 4 in the case 1 and serves to substantially remove visible light from the input light to the camera 4 and transmit substantially only infrared light. The processor 5 binarizes the gray level of the infrared image captured by the camera 4 and performs image processing. The infrared light emitting LED 9 is disposed at the front end of the case 1 so as to face outward and downward, and mainly emits infrared light. The battery 10 is provided inside the upper end of the case 1, and a cylindrical lithium ion secondary battery or the like is used. The external device corresponds to a personal digital assistant (PDA), a computer, a mobile phone, or the like.
[0022]
The visible light removing filter 8 is supported inside a cylindrical support 16 as shown in FIG. The support 16 has a male screw 17 formed on the outer peripheral surface, and a female screw 18 with which the male screw 17 is screwed is formed in the opening 3 on the case 1 side. It is detachably screwed.
[0023]
In FIG. 3, the detection markers 12 are formed by a plurality of types of dots (black circles) having different diameters, and are arranged dispersedly within a writable range of the paper 11. The dots of each type of the detection marker 12 are arranged according to a predetermined rule, and a position (coordinate) on the paper 11 is specified from this arrangement relationship. That is, the detection marker 12 is formed in a pattern for indicating a position on the paper 11. The diameter of each type of dot is set to an inconspicuous degree.
[0024]
The detection marker 12 is printed with ink containing a large amount of black inorganic pigment. As the inorganic pigment, a pigment having a high infrared absorptance is selected. In other words, inorganic pigments include carbon-based materials such as carbon black and graphite having high infrared absorptivity, transition metal oxides such as magnetite (iron sesquioxide) and manganese dioxide, and carbon-based materials and transition metal oxides. And the like. As the paper 11, plain paper having a low infrared absorptivity can be used.
[0025]
The guide marker 13 is printed with ink having a low infrared absorptance. That is, as the printing ink for the guide marker 13, an organic dye that does not include the above-described ink having a high infrared absorptance is selected. As the organic dye, fuchsin having a low infrared absorptivity is included. As a result, the difference in contrast between the infrared rays of the paper 11 and the guide marker 13 and the detection marker 12 increases, and the processor 5 of the pen-type input device converts the detection marker 12 from the infrared image captured by the camera 4. Detect reliably.
[0026]
The processor 5 of the pen-type input device detects the detection marker 12 located around the pen tip of the pen unit 2 with the camera 4 and determines the pen tip position of the pen unit 2 on the paper 11 and the moving direction of the pen tip. The pen portion 2 detects the pen pressure and detects the pen content. These data are transmitted to and input to an external device, and the external device recognizes, based on the input data, characters, figures, and the like written by the pen-type input device.
[0027]
In the pen-type input device and the paper having the above-described configuration, it was confirmed whether the contents described in the pen-type input device were properly recognized by the computer.
[0028]
Example 1 A ruled line of the guide marker 13 was printed on a sheet of paper with an ink jet printer (Ink Jet Printer 820C manufactured by Epson Corporation) using an organic dye-based genuine black ink having a low infrared absorptivity. Next, the dots of the detection marker 12 were printed on the entire sheet 11 with a genuine toner containing carbon black using a color copier (PPC color copier DocuColor500CP manufactured by Fuji Xerox Co., Ltd.). On the sheet 11, numerals “1” to “10” and alphabets are written so as to straddle the ruled line of the guide marker 13 with the pen-type input device. The paper 11 used was KOKUYO's common paper KB-19.
[0029]
(Comparative Example 1) The guide marker 13 and the detection marker 12 are printed on the paper 11 in the same procedure as in the embodiment except that the visible light removal filter 8 is removed from the pen-type input device. Numbers “1” to “10” and alphabets are written on the paper 11 so as to straddle the ruled line of the guide marker 13 with a pen-type input device.
[0030]
In the paper obtained in Example 1, characters of numbers and alphabets were correctly recognized, but in Comparative Example 1, characters of numbers and alphabets were not recognized. This is probably because the pen-type input device erroneously detected the guide marker 13 as the detection marker 12.
[0031]
The visible light removing filter 8 may be one that transmits only ultraviolet light. In this case, the detection marker 12 is printed with an ink having a high ultraviolet absorption rate, and the guide marker 13 is printed with an ink having a low ultraviolet absorption rate. Further, the LED 9 is set as an ultraviolet light emitting LED. Note that the camera 4 can detect ultraviolet rays.
[0032]
The pen-type input device may be provided with a lid that can be opened and closed similarly to a flashlight or the like, and the lid 10 may be opened to replace the battery 10 in the case 1. Battery 10 may be a primary battery. The detection marker 12 may be a double circle or a bar code.
[0033]
In order to prevent forgery or the like, the printing ink of the detection marker 12 may include a colored pigment containing magnetic ferric oxide or the like, or a conductive material such as ITO (indium tin oxide). The printing ink of the guide marker 13 may include a color other than black.
[Brief description of the drawings]
FIG. 1 is a front view showing a schematic configuration of a pen-type input device. FIG. 2 is a vertical sectional front view of a main part of the pen-type input device. FIG. 3 is a plan view of a sheet.
DESCRIPTION OF SYMBOLS 1 Case 2 Pen part 3 Opening 4 Camera 8 Visible light removal filter 11 Paper 12 Detection marker 13 Guide marker

Claims (10)

In a handwriting input system, a pen-type input device detects a marker for detection printed on a sheet, and inputs handwritten content handwritten at a predetermined writing position on the sheet to an external device.
A guide marker indicating the writing position is printed on the paper,
The pen-type input device, a pen-type case, a pen portion provided on the tip side of the case, an opening provided on the tip of the case, and a camera facing the periphery of the tip portion of the pen portion through the opening. Including a visible light removal filter disposed in the opening,
The visible light removal filter removes visible light from the input light to the camera and transmits only invisible light,
The detection marker is printed with a high ink absorption rate of the invisible light,
The handwriting input system, wherein the guide marker is printed with an ink having a low absorption rate of the invisible light. The handwriting input system according to claim 1, wherein the visible light removing filter is detachable from the opening of the case. The handwriting input system according to claim 1, wherein the invisible light is infrared light. The detection markers are arranged in a dispersed state on the paper,
2. The handwriting input system according to claim 1, wherein each detection marker is formed in a pattern for indicating a position on the paper. In a pen-type input device that inputs written content handwritten on paper to an external device,
A pen-shaped case, a pen portion provided on the front end side of the case, an opening provided on the front end of the case, a camera facing around the front end of the pen portion through the opening, and a visible light disposed in the opening. A light rejection filter;
The pen-type input device, wherein the visible light removing filter removes visible light from the input light to the camera and transmits only invisible light. The pen-type input device according to claim 5, wherein the visible light removing filter is detachable from the opening of the case. The pen-type input device according to claim 5, wherein the invisible light is infrared light. Paper used in a handwriting input system for inputting written content with a pen-type input device having a camera,
A detection marker for detection by the camera and a guide marker indicating a predetermined writing position are printed,
The detection marker is printed with an ink having a high absorption rate of invisible light,
The paper for use in a handwriting input system, wherein the guide marker is printed with an ink having a low absorption rate of the invisible light. The paper used in the handwriting input system according to claim 8, wherein the invisible light is infrared light. The detection markers are arranged in a dispersed state,
9. The paper used in the handwriting input system according to claim 8, wherein each detection marker is formed in a pattern for indicating a position.

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