KR102213541B1 - Method for improving recognition rate using a digital pen for film printed pattern - Google Patents

Abstract

The present invention relates to a recognition rate improvement system of digital pen for pattern printing film and a method thereof, wherein two camera sensors are disposed inside a pen body, a rotation angle and an inclination angle of the pen body are detected through a gyro sensor except for the pattern image photographed from the camera sensor disposed at an angle where a saturation phenomenon occurs due to a light reflection effect, during a process of photographing a pattern printed on the pattern printing film from the camera sensor, and the pattern image photographed from the remaining camera sensors is acquired. According to the present invention, by avoiding the saturation phenomenon, the recognition rate of the digital pen can be improved, and the angle of use of the digital pen can be extended.

Description

Method for improving recognition rate using a digital pen for film printed pattern}

The present invention relates to a method of improving the recognition rate using a digital pen for pattern printing film, and more particularly, one infrared LED and two camera sensors are arranged in the center of the lower portion of the pen body based on the central axis of the infrared LED, and the camera sensor In the process of photographing the pattern printed on the pattern printing film, the rotation angle and the inclination angle of the pen body are detected through the gyro sensor, and the pattern image photographed from the camera sensor disposed at the angle where the saturation phenomenon occurs due to the reflection effect of light is excluded. And, by configuring to acquire the pattern image photographed from the remaining camera sensors, by avoiding the saturation phenomenon, it is possible to improve the recognition rate of the digital pen, as well as the digital for pattern printing film that can expand the angle of use of the digital pen. It relates to a method of improving the recognition rate using a pen.

In general, a digital pen is capable of writing by recognizing the trajectory wherever a dot pattern is formed. When an infrared LED is irradiated on the surface of the pattern printing film on which the pattern is printed, the light irradiated from the infrared LED is transmitted to the surface of the pattern printing film. It is configured to take an infrared image as it is reflected in and input to the camera sensor.

When these digital pens are connected to devices such as e-notes, notebooks, smartphones, smart TVs, and electronic boards, the handwritten contents are transmitted in real time and displayed on the screen, so that you can check them immediately, and the written and edited contents are stored in the internal memory. Or, it is configured to be shared with other users or devices through mail, SNS, and the cloud.

The'electronic pen system' as described above is published in Registration Patent No. 10-1453467 (hereinafter referred to as'Patent Document 1').

Referring to Patent Document 1, a conventional'electronic pen system' includes: a reflective display that displays information using ambient light; An optical film disposed on the reflective display and having an information pattern formed thereon for providing location information using light reflected from the reflective display; And an electronic pen that recognizes the information pattern and transmits a signal for displaying graphic information on the reflective display,

The information pattern of the optical film includes a mark that provides the location information based on a mark value determined according to a position formed around an intersection of the virtual grid line and the virtual grid line, and the brightness of the mark is the reflective type It is characterized by being darker than the brightness of pixels for displaying graphic information on the display.

Patent Document 1 composed of the above configuration can display or delete graphic information on a reflective display according to the location information calculated from the mark, and reduce power consumption by using a reflective display using an external light source. It is configured to be applied to the field of smart learning, but when the emission angle of the infrared LED and the incident angle of the camera sensor become the same based on 90 degrees, the pattern image cannot be accurately obtained due to light saturation. As the x and y coordinates cannot be extracted, not only the recognition rate of the digital pen decreases, but also it is difficult to expand the angle of use of the digital pen.

Patent Document 1: Korean Registered Patent Publication No. 10-1453467

The present invention has been conceived to solve the above-described problem, and an object of the present invention is to arrange one infrared LED and two camera sensors based on the central axis of the infrared LED at the lower center of the pen body, and a pattern printing film from the camera sensor. In the process of photographing the printed pattern, the rest of the cameras except for the pattern image photographed from the camera sensor placed at the angle where the saturation phenomenon occurs due to the reflection effect of light by detecting the rotation angle and inclination angle of the pen body through the gyro sensor. By configuring to acquire the pattern image photographed from the sensor, by avoiding the saturation phenomenon, it is possible to improve the recognition rate of the digital pen, as well as the recognition rate using a digital pen for pattern printing film that can extend the angle of use of the digital pen. It is to provide a way to improve.

In addition, one camera sensor and two infrared LEDs are arranged based on the central axis of the camera sensor inside the pen body, and the rotation angle and inclination angle of the pen body are detected through the gyro sensor to reduce the reflection effect of light among the two infrared LEDs. By selecting the infrared LED at a location that can avoid the saturation phenomenon and configuring the photographing through the camera sensor in the state of irradiation with light, it is possible to improve the recognition rate of the digital pen by avoiding the saturation phenomenon. It is to provide a method of improving the recognition rate using a digital pen for pattern printing film, which can expand the angle of use of the digital pen.

In order to solve the above problems, a method of improving the recognition rate using a digital pen for a pattern printing film according to a preferred embodiment of the present invention includes arranging an infrared LED in the lower center of the pen body of the digital pen, and adjusting the central axis of the infrared LED. Arranging two camera sensors symmetrically or at an angle based on the reference; Photographing a pattern printed on a pattern printing film from the two camera sensors; Detecting a rotation angle and an inclination angle of the pen body through a gyro sensor while photographing the pattern printed on the pattern printing film using the two camera sensors; And a pattern image photographed from a camera sensor disposed at an angle at which saturation occurs due to a reflection effect of light based on the rotation angle and inclination angle of the pen body detected by the gyro sensor by the control unit, It characterized in that it includes; obtaining a pattern image.

On the other hand, a method for improving recognition rate using a digital pen for a pattern printing film according to another embodiment of the present invention is to arrange a camera sensor in the lower center of the pen body of the digital pen, and two infrared rays based on the central axis of the camera sensor. Arranging the LEDs symmetrically or at an angle; Detecting a rotation angle and an inclination angle of the pen body through a gyro sensor; The control unit controls to irradiate light of the rest of the infrared LEDs, except for the infrared LEDs arranged at an angle at which saturation occurs due to the reflection effect of light based on the rotation angle and inclination angle of the pen body detected through the gyro sensor. step; And obtaining a pattern image by photographing the pattern image printed on the pattern printing film through the camera sensor under the control of the controller.

In addition, when the two camera sensors are arranged at a different angle, one camera sensor is configured for low-angle photographing to prevent saturation due to the reflection effect of light when the digital pen is inclined at a low angle, and the other Is characterized in that it is configured for high-angle photographing to prevent saturation due to light reflection effect when the digital pen is erected at an elevation.

In addition, when the two infrared LEDs are arranged at a different angle, one infrared LED is configured to irradiate light to prevent saturation due to the reflection effect of light when the digital pen is inclined at a low angle, and the other The digital pen is characterized in that it is configured to irradiate light to prevent saturation due to the reflection effect of light when the digital pen is erected at an elevated angle.

In addition, the pattern images photographed through the two camera sensors are stored in the main memory area in a state arranged through the daughter board, and the difference in contrast of the pattern image due to the difference in illuminance is set to a preset threshold. It is characterized in that it is rearranged and transmitted to the main board.

As described above, according to the present invention, in the process of arranging one infrared LED and two camera sensors based on the central axis of the infrared LED at the lower center of the pen body, and photographing the pattern printed on the pattern printing film from the camera sensor. By detecting the rotation angle and inclination angle of the pen body through the gyro sensor, except for the pattern image photographed from the camera sensor placed at the angle where the saturation phenomenon occurs due to the reflection effect of light, the pattern image photographed from the remaining camera sensors is acquired. By configuring, as the saturation phenomenon is avoided, the recognition rate of the digital pen can be improved, and the angle of use of the digital pen can be extended.

In addition, one camera sensor and two infrared LEDs are arranged based on the central axis of the camera sensor inside the pen body, and the rotation angle and inclination angle of the pen body are detected through the gyro sensor to reduce the reflection effect of light among the two infrared LEDs. By selecting the infrared LED at a location that can avoid the saturation phenomenon and configuring the photographing through the camera sensor in the state of irradiation with light, it is possible to improve the recognition rate of the digital pen by avoiding the saturation phenomenon. There is an advantage of extending the angle of use of a digital pen.

1 and 2 are configuration diagrams of a digital pen for a pattern printing film according to a preferred embodiment of the present invention.
3 and 4 are configuration diagrams of a digital pen for a pattern printing film according to another embodiment of the present invention.
5 is an explanatory view showing a saturation phenomenon screen of a method for improving recognition rate using a digital pen for a pattern printing film according to a preferred embodiment of the present invention.
6 is a flowchart of a method for improving recognition rate using a digital pen for pattern printing film according to a preferred embodiment of the present invention.
7 is a flow chart of a method for improving recognition rate using a digital pen for a pattern printing film according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. The same reference numerals shown in each drawing indicate the same members.

1 and 2 are configuration diagrams of a digital pen for pattern printing film according to a preferred embodiment of the present invention, and FIG. 5 is a saturation phenomenon screen of a method for improving recognition rate using a digital pen for pattern printing film according to a preferred embodiment of the present invention. It is an explanatory view showing, and FIG. 6 is a flowchart of a method for improving recognition rate using a digital pen for pattern printing film according to a preferred embodiment of the present invention.

First, the digital pen 100 for a pattern printing film according to a preferred embodiment of the present invention recognizes a specific pattern printed on the pattern printing film 10, and receives a user command signal, and provides at least one unit cell pattern. Optical system/lens for optical input, fluctuation calculation sensor for measuring fluctuation of coordinate values of absolute coordinates, absolute coordinate calculation sensor for calculating absolute coordinates by recognizing the image of the input unit cell pattern, fluctuation calculation sensor and absolute coordinates It may be composed of a control unit that processes information input from the calculation sensor, an internal memory that stores schedule information under the control of the control unit, and a communication unit that performs a communication function under control of the control unit.

In addition, as shown in FIG. 1, the digital pen 100 has a predetermined length so that the user can grasp it, expands the image and deepens the depth of the lens to extend the writing angle, and has a wavelength of about 850 nm. The branch has a pen body 110 accommodating a barrel portion that passes infrared rays and blocks visible light to make the image of the infrared LED more clear, and a pattern printing film (which is provided at the lower end of the pen body 110). 10) a pen tip 120 to enable writing, a pen tip cover 130 coupled to the lower end of the pen body 110 while appreciating a part of the pen tip 120, and the pattern printing film 10 It is configured to include an infrared LED 140 for irradiating the light and a camera sensor 150 for obtaining a pattern image to recognize a pattern on the pattern printing film 10 in which the pen tip 120 is located.

As shown in FIG. 5, when the infrared LED 140 is reflected by the pattern printing film 10 with the reference to the virtual central axis of 90 degrees to the pattern printing film 10 and the incident angle is the same, as shown in FIG. As saturation occurs in the areas (b), (d), (e), (f), and (h) due to the reflection effect of the digital pen, the recognition rate of the digital pen decreases significantly.In the present invention, the digital pen ( It is characterized in that the infrared LED 140 is arranged in the lower center of the pen body 110 of 100), and the two camera sensors 150 and 150 ′ are symmetrically arranged with respect to the central axis of the infrared LED 140 As, after each photographing a pattern printed on the pattern printing film 10 from the two camera sensors 150 and 150', a pattern image without saturation phenomenon is obtained, and x,y coordinates for the pattern are easily extracted. It is possible to do.

On the other hand, in the present invention, the inner side of the pen body 110, characterized in that the gyro sensor 160 is provided on the upper portion of the barrel, the pen body by measuring the value of the xyz 3-axis through the gyro sensor 160 It is configured to detect the rotation angle and the inclination angle of the 110, whereby the saturation phenomenon occurs due to the reflection effect of light based on the rotation angle and inclination angle of the pen body 110 detected through the gyro sensor 160 in the control unit. By configuring to obtain a pattern image photographed from the remaining camera sensors 150 ′, excluding the pattern image photographed from any one camera sensor 150 disposed at an angle, thereby avoiding the saturation phenomenon, the recognition rate of the digital pen Not only can it improve, but it is also possible to extend the angle of use of the digital pen.

The gyro sensor 160 is preferably configured to be located on the inner upper portion of the pen body 110 so that it is possible to easily detect the rotation angle and inclination angle of the pen body 110.

On the other hand, as shown in FIG. 2, it is possible to configure the two camera sensors 150, 150 ′ to be disposed at an angle based on the central axis of the infrared LED 140, in this case, any one camera sensor 150 ') is configured for low-angle photography to prevent saturation due to the reflection effect of light when the digital pen is inclined at a low angle, and the other 150 is due to the reflection effect of light when the digital pen is erected at an elevated angle. By being configured for high-angle photographing to prevent saturation, it is possible to effectively acquire a pattern image. When the camera sensors 150 and 150 ′ are disposed at an angle, it is preferable that an extension part 131 is provided on the pen tip cover 130 to facilitate installation.

Other matters related to the configuration and operation method of the digital pen 100 are known in the art to which the present invention pertains, and a detailed description thereof will be omitted.

Hereinafter, a method of improving the recognition rate using a digital pen for a pattern printing film according to a preferred embodiment of the present invention will be described with reference to FIGS. 1, 2 and 6.

First, the infrared LED 140 is placed in the center of the lower end of the pen body 110 of the digital pen 100, and two camera sensors 150 and 150' are symmetrically or at an angle with respect to the central axis of the infrared LED 140. The pattern printed on the pattern printing film 10 is photographed (S200) from the two camera sensors 150 and 150 ′ in the arrangement (S100). In this case, the pattern is performed using the two camera sensors 150 and 150 ′. In the process of photographing the pattern printed on the printing film 10, the rotation angle and the inclination angle of the pen body 110 are detected through the gyro sensor 160 (S300). The rotation angle detected by the gyro sensor 160 is 0° to 360°, and the inclination angle is 0° to 90°.

As described above, when the rotation angle and inclination angle of the pen body 110 are detected through the gyro sensor 160, a saturation phenomenon occurs due to the reflection effect of light in the control unit based on the detected rotation angle and inclination angle of the pen body 110. Excluding the pattern image photographed from the camera sensor arranged at an angle to obtain a pattern image photographed from the remaining camera sensors (S400), in this case, each area (a, b, c, d, e, By designating a camera sensor where saturation occurs when the pen body 110 is positioned for each f, g, h, i), it can be configured to acquire a pattern image photographed through a camera sensor other than the corresponding camera sensor, In a similar concept, by designating a camera sensor that can be used when the pen body 110 is positioned in each area (a,b,c,d,e,f,g,h,i), It can be configured to exclude pattern images.

On the other hand, when the two camera sensors 150 and 150 ′ are arranged at an opposite angle, as described above, any one camera sensor 150 ′ prevents saturation due to the reflection effect of light while the digital pen is inclined at a low angle. It is configured for low-angle photographing to prevent, and the other 150 is configured for high-angle photographing to prevent saturation due to the reflection effect of light in a state where the digital pen is erected at a high angle. As a result, the pen body 110 Regardless of the position, it is possible to obtain a pattern image by simply selecting one of the two camera sensors using only the tilt angle.

The pattern images photographed through the two camera sensors 150 and 150 ′ are stored in the main memory area in an aligned state through the daughter board, and the difference in contrast of the pattern image due to the difference in illuminance is determined by a preset threshold. ) To be rearranged and transferred to the main board.

Hereinafter, a digital pen for a pattern printing film according to another embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In the digital pen 100 for a pattern printing film according to another embodiment of the present invention, as shown in FIG. 3, a camera sensor 150 is disposed in the lower center of the pen body 110 of the digital pen 100 , It is characterized in that it is configured to symmetrically arrange two infrared LEDs 140 and 140 ′ with respect to the central axis of the camera sensor 150, and in order to obtain a pattern image in which saturation does not occur, two infrared LEDs ( 140, 140') to operate, that is, in a state controlled to irradiate light, each of the patterns printed on the pattern printing film 10 through the camera sensor 150 is photographed, so that the x,y coordinates of the pattern can be easily obtained. It is possible to extract.

In detail, the digital pen 100 for a pattern printing film according to another embodiment of the present invention is configured to detect the rotation angle and inclination angle of the pen body 110 by measuring the value of the xyz 3-axis through the gyro sensor 160 Thereby, based on the rotation angle and inclination angle of the pen body 110 detected by the gyro sensor 160 by the control unit, any one infrared LED 140 disposed at an angle at which saturation occurs due to the reflection effect of light. ), by controlling to irradiate the light of the remaining infrared LEDs 140' to obtain a pattern image captured through the camera sensor 150, thereby avoiding saturation, thereby improving the recognition rate of the digital pen. Not only can it be possible, but it is also possible to expand the angle of use of the digital pen.

On the other hand, as shown in FIG. 4, it is possible to configure the two infrared LEDs 140 and 140' to be arranged at an oblique angle with respect to the central axis of the camera sensor 150. In this case, any one infrared LED 140 ') is configured to irradiate light to prevent saturation due to the reflection effect of light when the digital pen is inclined at a low angle, and the other 140' is to prevent light reflection effects when the digital pen is erected at an elevated angle. By being configured to irradiate light to prevent saturation due to, it is possible to obtain a pattern image effectively. When the infrared LEDs 140 and 140 ′ are disposed at an angle, it is preferable that an extension part 131 is provided on the pen tip cover 130 to facilitate installation.

Other matters related to the configuration and operation method of the digital pen 100 are known in the art to which the present invention pertains, and a detailed description thereof will be omitted.

Hereinafter, a method of improving a recognition rate using a digital pen for a pattern printing film according to another embodiment of the present invention will be described with reference to FIGS. 3, 4 and 7.

First, the camera sensor 150 is placed in the center of the lower end of the pen body 110 of the digital pen 100, and two infrared LEDs 140 and 140' are symmetrically or staggered with respect to the central axis of the camera sensor 150. In the arrangement (S500), the rotation angle and the inclination angle of the pen body 110 are detected through the gyro sensor 160 (S600). At this time, the rotation angle detected by the gyro sensor 160 is 0° to 360°, and the inclination angle is 0° to 90°.

As described above, when the rotation angle and inclination angle of the pen body 110 are detected through the gyro sensor 160, a saturation phenomenon occurs due to the reflection effect of light in the control unit based on the detected rotation angle and inclination angle of the pen body 110. Excluding the infrared LED disposed at an angle to be irradiated (S700), the camera sensor 150 is controlled to capture the pattern printed on the pattern printing film 10 while controlling the light of the remaining infrared LED to be irradiated. Acquire (S800).

At this time, by designating the infrared LED in which saturation occurs when the pen body 110 is positioned for each area (a, b, c, d, e, f, g, h, i) of FIG. 5, the corresponding infrared LED is It can be configured to irradiate light of other infrared LEDs, and in a similar concept, it is used when the pen body 110 is positioned in each area (a, b, c, d, e, f, g, h, i) By designating possible infrared LEDs, it is possible to configure the rest of the infrared LEDs to not operate.

On the other hand, when two infrared LEDs 140 and 140' are arranged at an angle, as described above, any one infrared LED 140' prevents saturation due to the reflection effect of light when the digital pen is inclined at a low angle. It is configured to irradiate light for, and the other 140 is configured to irradiate light to prevent saturation due to the reflection effect of light in a state in which the digital pen is erected at an elevated angle. Accordingly, the pen body 110 Regardless of the position, it is possible to configure to irradiate light by simply selecting one of the two infrared LEDs using only the inclination angle.

As described above, the present invention arranges one infrared LED 140 and two camera sensors 150 and 150 ′ based on the central axis of the infrared LED 140 inside the pen body 110, and the camera sensors 150 and 150 In the process of photographing a pattern image from'), an image photographed from a camera sensor disposed at an angle at which saturation occurs due to the reflection effect of light by detecting the rotation angle and inclination angle of the pen body 110 through the gyro sensor 160 Except for, it is possible to improve the recognition rate of the digital pen as well as expand the angle of use of the digital pen by avoiding the saturation phenomenon by configuring the coordinates to be extracted using the image captured from the remaining camera sensors. Do.

In addition, one camera sensor 150 and two infrared LEDs 140 and 140 ′ are disposed within the pen body 110 based on the central axis of the camera sensor 150, and the pen body ( 110) by detecting the rotation angle and inclination angle of the two infrared LEDs (140, 140') through the camera sensor 150 in the state of irradiating the light by selecting the infrared LED at a position that can avoid the saturation phenomenon caused by the light reflection effect. By configuring the photographing to take place, not only can the recognition rate of the digital pen be improved, but also the angle of use of the digital pen can be extended by avoiding the saturation phenomenon.

Optimal embodiments have been disclosed in the drawings and specification. Although specific terms have been used herein, these are used only for the purpose of describing the present invention, and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

10: pattern printing film 100: digital pen
110: pen body 120: pen tip
130: pen tip cover 131: extension
140,140': infrared LED 150,150': camera sensor
160: gyro sensor

Claims (5)

Arranging an infrared LED in the lower center of the pen body of the digital pen, and arranging two camera sensors at an angle based on the central axis of the infrared LED;
Photographing a pattern printed on a pattern printing film from the two camera sensors;
Detecting an inclination angle of the pen body through a gyro sensor in the process of photographing a pattern printed on a pattern printing film using the two camera sensors; And
Pattern images photographed from the rest of the camera sensors except for the pattern image photographed from the camera sensor arranged at the angle where the saturation phenomenon occurs due to the reflection effect of light based on the inclination angle of the pen body detected by the control unit through the gyro sensor Including;
When the two camera sensors are arranged at an opposite angle, one camera sensor is configured for low-angle photographing to prevent saturation due to the reflection effect of light when the digital pen is inclined at a low angle, and the other is digital. It is configured for high-angle shooting to prevent saturation caused by the light reflection effect when the pen is standing at an elevation.
The camera sensor configured for high-angle photographing is a method of improving recognition rate using a digital pen for pattern printing film, characterized in that it is installed inside an extension part extending downward from the pen tip cover.
Arranging a camera sensor in the lower center of the pen body of the digital pen, and arranging two infrared LEDs at an angle with respect to the central axis of the camera sensor;
Detecting an inclination angle of the pen body through a gyro sensor;
Controlling, by a controller, to irradiate light of the remaining infrared LEDs, except for the infrared LEDs disposed at an angle at which saturation occurs due to a reflection effect of light based on the inclination angle of the pen body detected through the gyro sensor; And
Including, by photographing a pattern image printed on the pattern printing film through the camera sensor under the control of the control unit;
When the two infrared LEDs are arranged at an opposite angle, one of the infrared LEDs is configured to irradiate light to prevent saturation due to the reflection effect of light when the digital pen is inclined at a low angle, and the other is digital It is configured to irradiate light to prevent saturation caused by the light reflection effect while the pen is standing at an elevated angle.
A digital pen for pattern printing film, characterized in that the infrared LED that irradiates light to prevent saturation due to the light reflection effect while the digital pen is erected at a high angle is installed inside the extension part extending downward from the pen tip cover. Recognition rate improvement method using.
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