KR101792397B1 - A Touch Sensing Apparatus and Method of Using the Background Intensity Control Technology - Google Patents

A Touch Sensing Apparatus and Method of Using the Background Intensity Control Technology Download PDF

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KR101792397B1
KR101792397B1 KR1020160027255A KR20160027255A KR101792397B1 KR 101792397 B1 KR101792397 B1 KR 101792397B1 KR 1020160027255 A KR1020160027255 A KR 1020160027255A KR 20160027255 A KR20160027255 A KR 20160027255A KR 101792397 B1 KR101792397 B1 KR 101792397B1
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touch sensing
light amount
value
distribution value
predetermined
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KR1020160027255A
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Korean (ko)
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KR20170104714A (en
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정승태
심수연
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주식회사 아이티티
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/002—Specific input/output arrangements not covered by G06F3/01 - G06F3/16
    • G06F3/005—Input arrangements through a video camera
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form

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  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Position Input By Displaying (AREA)

Abstract

The present invention relates to a touch sensing apparatus and method using a background light amount control technique, and more particularly, to a touch sensing apparatus and method using a background light intensity control technique, which comprises two or more camera modules for photographing a touch sensing area, A touch control module for calculating a deviation value, a touch sensing signal extraction and a touch sensing coordinate, and an interface module for transmitting the touch sensing coordinates of the control module to a display screen, wherein the effective touch sensing A light amount variation value according to a light amount distribution value of a region is calculated and a touch sense signal corresponding to a deviation of a certain threshold value or more from a certain pixel position is determined to extract touch sensing coordinates and a background light amount control Technology and a touch sensing device using the same One will.

Description

Technical Field [0001] The present invention relates to a touch sensing apparatus and method using a background light amount control technique,

The present invention relates to a touch sensing apparatus and method using a background light intensity control technique, which calculates a light intensity deviation value according to a light intensity distribution value of a predetermined effective touch sensing area in an image captured by two or more camera modules, The present invention relates to a touch sensing apparatus and a touch sensing method using a background light amount control technique for extracting touch sensing coordinates and displaying the extracted touch sensing coordinates on a display screen by determining a touch sensing signal according to occurrence of a light amount deviation value equal to or greater than a predetermined threshold value.

In recent years, there has been proposed a touch sensing apparatus or a touch sensing apparatus which, when a human hand or an object touches a character or a specific position displayed on a screen (screen) without using a keyboard, processes the function corresponding to the position determined by the stored software, Touch screens are widely used.

As a method of implementing such a touch sensing device or a touch screen, there are several techniques that are technically different depending on the size and use of the screen. Typical examples include a resistive type, an electrostatic type, a surface ultrasonic type, an infrared type, ) Method.

In this case, the IR LED camera system having the IR LED grid method is mainly used for the conventional large-sized display. However, since the IR LED array bar is installed around the display screen, It is possible to prevent the sensor from reaching the camera or the camera. In this case, since the amount of light reflected from the finger and the like is high in the high illuminance as in the case of outdoor, There is a problem that it often occurs. In addition, since the LED array bar must be installed around the display and the optical alignment is distorted over time, it is difficult for the general user to purchase the device easily, and the device can not be used in an environment where the light amount is large as in the outdoor, There is a disadvantage that it is impossible to expand the market to a sensing device.

In addition, the infrared ray method used as a general method of a medium to large-size touch screen has a problem that it is difficult to install a touch sensing device, production and manufacturing costs are high, a range of application is limited, and coordinate errors occur in a multi-point method.

Therefore, it is required to develop a multi-touch multi-touch sensing device that can operate without any additional parts such as an LED lighting bar around the monitor and can be used in an outdoor environment.

As a conventional technique for solving the above problems, Korean Patent Laid-Open No. 10-2009-0116544 discloses an infrared camera type spatial touch sensing device, a method and a screen device.

However, according to the above-described conventional technology, it is possible to detect the user indicating means entering into the touch sensing space by the infrared radiographic image through the infrared camera, and the visible light blocking filter or the like is applied to the infrared camera, However, there is a disadvantage in that it is impossible to control and judge the ambient light quantity value in addition to the disadvantage that the infrared light emitter is installed separately by using the infrared light sensing camera, thereby increasing manufacturing and installation costs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an integrated touch sensing device including two or more camera modules, a control module and an interface module to extract touch sensing coordinates.

It is another object of the present invention to provide a rod-shaped multi-touch sensing apparatus that can be operated and used in any outdoor environment without the need for any additional components such as an LED illumination bar around the monitor.

In addition, the present invention extracts the touch detection coordinates according to the light amount deviation value using the light amount distribution value of the background corresponding to the predetermined effective touch detection area in the image taken by the camera module, It is another object of the present invention to allow the touch-sensitive coordinate to be transmitted to the display screen only when it is within the range.

According to another aspect of the present invention, there is provided a camera-based touch sensing apparatus, comprising: at least two camera modules for capturing a touch sensing area; a light intensity variation value calculation unit for calculating a light intensity variation value according to a light intensity distribution value of a predetermined effective touch sensing area, A control module for calculating a touch sensing signal extraction and touch sensing coordinates and an interface module for transmitting the touch sensing coordinates of the control module to a display screen, (Ib (x)), which is a sum of corresponding pixel values of the image sensor corresponding to the sensing area, and a value of the corresponding pixel value of the image sensor according to the time in the effective touch sensing area (Is (x, t)) of the sum-of-hours.

According to another aspect of the present invention, there is provided a method of operating a camera-based touch sensing device, comprising the steps of: installing the touch sensing device; detecting at least one valid touch sensing area in a captured image of the camera module of the touch sensing device; A second step of setting a coordinate plane of a display area, a third step of calculating a light amount deviation value according to a light amount distribution value of a predetermined effective touch sensing area in an image photographed by the camera module, A fourth step of determining a touch sensing signal when a deviation of a certain pixel position of the sensing area is greater than a predetermined threshold value and extracting touch sensing coordinates by triangulation calculation; And transmits the touch-detected coordinates to the display screen only when it is within the display area range And a fifth step of performing the second step.

Therefore, the touch sensing apparatus using the background light amount control technique of the present invention has an effect that it can be attached to any place indoors or outdoors where the change of the light amount is frequent without installing a touch panel or the like around the monitor.

In addition, the present invention has the effect that the sensitivity of detection is not deteriorated even if the light reflected from the touch object is strong due to the adjustment of the light amount distribution value for touch detection even in an environment where the light amount is enriched as in outdoor. In particular, since a front surface such as a digital shine is designed to be a glass plane, there is an effect of solving problems such as a limitation in use due to protrusion of a peripheral lighting bar and a malfunction in a high temperature in the conventional optical system.

In addition, the present invention can be applied not only to a touch sensing device having a medium to large screen, but also to an indoor / outdoor shine, an electronic blackboard, and a touch sensing external touch sensing device which can be easily manufactured at low cost, .

1 is a configuration diagram of a touch sensing apparatus using a background light amount control technique according to an embodiment of the present invention,
2 is a graph of an initial photographed image of a camera module and a base light amount distribution value Ib (x) of the image according to an embodiment of the present invention,
FIG. 3 is a graph showing an initial light amount deviation value calculation graph and a light amount deviation value after a certain period of time according to an embodiment of the present invention,
FIG. 4 is a graph illustrating a touch image captured by a camera module and a touch sensed by calculating a light amount deviation value of the touch image according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating an operation method of a touch sensing apparatus using a background light amount control technique according to an embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a touch sensing apparatus using a background light amount control technique according to an embodiment of the present invention.

1, the present invention is a touch sensing device 100 having two or more camera modules 110, a control module 120, and an interface module 130 formed integrally.

This is explained in detail as follows.

The camera module 110 is composed of an image sensor and a lens, each of which uses a general visible light rather than an infrared ray. The camera module 110 is arranged at a certain distance so as to photograph a given sensing area. And transmits the photographed image (image) to the control module 120.

In addition, the camera module 110 may implement a multi-touch sensing function by disposing a plurality of camera modules at a predetermined distance.

At this time, the camera module 110 preferably has a 180-degree wide-angle lens so that it is possible to photograph a wide range of areas.

The control module 120 operates as a control processor and calculates a light amount deviation value according to a light amount distribution value of a predetermined effective touch sensing area in an image photographed by the camera module 110, And performs a calculation function.

At this time, the light amount distribution value is divided into a base light amount distribution value Ib (x) and an hour light amount distribution value Is (x, t).

The control module 120 includes a memory for storing and processing the base light amount distribution value Ib (x) and the time light amount distribution value Is (x, t).

2 is a graph of an initial photographed image and a base light amount distribution value Ib (x) of the camera module 110 according to an embodiment of the present invention.

The initial photographic image is an image in which the upper part of the black monitor and the background area are photographed at the same time with the touch sensing device of the present invention installed on the upper part of the monitor.

At this time, an effective touch sensing area for determining a touch sensing area is set by previously setting a predetermined area of one or more areas in the image captured by the camera module 110 in advance. In the drawing, the dotted line portion is set as the effective touch sensing area of the present invention.

The base light amount distribution value Ib (x) represents a sum of corresponding pixel values of the image sensor corresponding to the effective touch sensing area in an image at the instant when each of the camera modules 110 is first photographed, The light amount values of the corresponding pixels in the Y-axis direction in the direction of the X-axis in the effective touch sensing area can be summed.

Also, the effective touch sensing area may be set to one or more areas.

Hereinafter, the light amount of the effective touch sensing area may be changed according to various factors according to the time, and the corresponding value of the image sensor according to the time in the effective touch sensing area, The sum of the pixel values is defined as a temporal light quantity distribution value (Is (x, t)).

The control module 120 calculates the light amount deviation value using the base light amount distribution value Ib (x) and the time light amount distribution value Is (x, t).

Therefore, the calculation of the light amount deviation value means calculating the relative deviation between the base light amount distribution value Ib (x) and the temporal light amount distribution value Is (x, t).

The calculation formula of the light quantity deviation value for obtaining the relative deviation is as follows.

(formula)

Figure 112016022031335-pat00001

At this time, if a relative deviation of a predetermined value or more occurs after a predetermined time according to the light amount deviation value calculation, the base light amount distribution value Ib (x) is initialized to the current time light amount distribution value Is (x, t) And continues to calculate the light amount deviation value.

This is reflected when the light amount value of the effective touch sensing area varies due to various factors according to the time. For example, when the light amount according to the base light amount distribution value Ib (x) (X (t)) is replaced with the temporal light amount distribution value Is (x, t) when the light amount value of the effective touch sensing area becomes larger as the deviation value becomes lower and the periphery becomes brighter. Thereby making it possible to continuously calculate the light amount deviation value.

As a result, even if the light amount value of the effective touch sensing area changes with time, it is corrected to the base light intensity distribution value Ib (x), thereby correcting the relative deviation. As a result, There is an effect that the touch detection sensitivity does not drop.

FIG. 3 is a graph illustrating an initial light amount deviation value calculation graph and a light amount deviation value after a predetermined time, according to an embodiment of the present invention.

The control module 120 may calculate the light amount deviation value using the base light amount distribution value Ib (x) and the time light amount distribution value Is (x, t) If a deviation of more than a predetermined threshold value occurs at a certain pixel position in the calculation, it is determined as a touch sensing signal.

4 is a graph illustrating a touch image captured by a camera module and a touch sensed by calculating a light amount deviation value of the touch image according to an exemplary embodiment of the present invention.

The control module 120 calculates the light amount distribution value through the photographed image as shown in the drawing. When the variation of the pulse shape is greater than a predetermined threshold value at a predetermined pixel position, the control module 120 calculates triangulation by each camera module 110 Thereby extracting the touch sensing coordinates.

This means that the touch points measured by the two cameras are converted into angular values to find the coordinates on the two-dimensional plane according to the triangulation method.

At this time, when the position of the touch sensing coordinates extracted by the triangulation calculation is recognized as effective touch coordinates within a predetermined range on the screen to be monitored or displayed, the control module 120 displays the touch sensing coordinates on the display screen send. This prevents the touch point recognized by the touch sensing device of the present invention mounted on the outside from deviating from the setting area or boundary of the monitor or the screen to be displayed.

In addition, the interface module 130 is a communication device operated by any one of various communication means for transmitting the touch sensing coordinates to the display screen or the external monitor by the control module 120.

In addition, the touch sensing apparatus 100 of the present invention may further include one or more auxiliary LED modules 140 to be integrated.

The auxiliary LED module 140 is an optical auxiliary device operated by the control module 120 in a dark environment where there is no light amount distribution value of the effective touch sensing area or an environment below a certain brightness.

5 is a flowchart illustrating an operation method of a touch sensing apparatus using a background light amount control technique according to an embodiment of the present invention.

The operation method of the camera-type touch sensing device as shown in the figure includes a first step (S100) of installing the touch sensing device, a second step (S200) of setting an effective touch sensing area and a coordinate plane area, A third step S300, a fourth step S400 of extracting the touch sensing coordinates, and a fifth step S500 of transmitting and displaying the touch sensing coordinates on the display screen.

In the first step S100, the touch sensing apparatus of the present invention is installed, and power is supplied to operate the touch sensing apparatus. At this time, the touch sensing device may be attached to a monitor on which touch coordinates are directly displayed, such as the top or bottom of the monitor, or may be attached to a place where the touch sensing space can be obtained, have.

In the second step S200, a touch point recognized by the touch sensing device for displaying one or more effective touch sensing areas and touch coordinates in an image captured by two or more camera modules mounted on the touch sensing device is displayed on a monitor A step of setting a coordinate plane of a predetermined display area so as not to deviate from a setting area or boundary of a screen to be displayed.

The third step S300 is a step of calculating a light amount deviation value according to a light amount distribution value of a predetermined effective touch sensing area in an image photographed by the camera module.

In the third step S300, the base light amount distribution value Ib (x) in the effective touch sensing area is firstly stored and the light amount distribution value Is (x, t) A third step S320 of calculating a relative deviation between the base light amount distribution value Ib (x) and the temporal light amount distribution value Is (x, t) (X (t)) which is the initial light amount distribution value (Is (x, t)) at the current time when a relative deviation greater than a predetermined value occurs after a predetermined time in step S320 Step S330.

The third step S300 is continuously performed unless a touch sense signal having a deviation of more than a predetermined threshold value is generated.

In the fourth step S400, when a deviation of a predetermined pixel value of the effective touch sensing area is greater than a predetermined threshold value, the touch sensing signal is determined to be a touch sensing signal and the touch sensing coordinate is extracted by triangulation calculation .

The fifth step S500 is a step of transmitting and displaying the touch sensing coordinates on the display screen only when the touch sensing coordinates are within the predetermined display area range on the plane in the fourth step.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

100: touch sensing device 110: camera module
120: control module 130: interface module
140; Auxiliary LED module

Claims (10)

A camera-type touch sensing device comprising:
Two or more camera modules for photographing the touch sensing area,
A control module for calculating a light amount deviation value according to a light amount distribution value of a predetermined effective touch sensing area in the image photographed by the camera module, extracting a touch sensing signal, and calculating touch sensing coordinates,
And an interface module for transmitting the touch sensing coordinates of the control module to a display screen,
Wherein the light amount distribution value is a sum of a base light amount distribution value Ib (x) that is a sum of corresponding pixel values of the image sensor corresponding to the valid touch sensing area at the instant the camera module is first photographed, (X, t), which is a sum of corresponding pixel values of the image sensor with respect to time in the effective touch sensing area,
Wherein the light amount deviation value calculation unit calculates a relative deviation between the base light amount distribution value (Ib (x)) and the time light amount distribution value (Is (x, t)) using the background light amount control technique .
The method according to claim 1,
Wherein the constant camera module is a camera module having a 180-degree wide-angle lens.
The method according to claim 1,
Further comprising one or more auxiliary LED modules operated by the control module when the light amount distribution value of the valid touch sensing area is a dark environment of less than a predetermined brightness.
The method according to claim 1,
Wherein the effective touch sensing area is a touch sensing area in which a predetermined portion of at least one area is previously set and set in an image photographed by each of the camera modules.
delete The method according to claim 1,
(X (t)) at the current time when the relative deviation of the base light amount distribution value Ib (x) is greater than a predetermined value after the predetermined amount of time according to the calculation of the light amount deviation value And a background light amount control technique.
The method according to claim 1,
Wherein when the light intensity distribution value is greater than a predetermined threshold value at a certain pixel position in the calculation of the light amount distribution value, the touch sensing signal is determined to be a touch sensing signal and the touch sensing coordinate is extracted by triangulation calculation.
8. The method of claim 7,
Wherein the touch sensing coordinate is transmitted to the display screen only when the touch sensing coordinate is within a predetermined display area range on a plane.
A method of operating a camera-based touch sensing device,
A first step of installing the touch sensing device,
A second step of setting a coordinate plane of at least one valid touch sensing area and a predetermined display area in the captured image of the camera module of the touch sensing device,
(3) for initially storing the base light amount distribution value Ib (x) in the predetermined effective touch sensing area and continuously extracting the hour light amount distribution value Is (x, t) from the image photographed by the camera module A third step of calculating a relative deviation between the base light amount distribution value Ib (x) and the time light amount distribution value Is (x, t), and a third step of calculating a light amount deviation value ; And
A fourth step of determining the touch sensing signal when a deviation of a certain pixel position of the effective touch sensing area is greater than a predetermined threshold value in the third step and extracting touch sensing coordinates by triangulation calculation;
And a fifth step of transmitting the touch sensing coordinates to the display screen only when the touch sensing coordinate is within the predetermined display area range on the plane in the fourth step. The touch sensing device according to claim 1, Way.
10. The method of claim 9,
(X (t)) at the current time when a relative deviation of a predetermined value or more occurs after a predetermined time in the step 3-2. 3 is a flowchart illustrating a method of operating a touch sensing apparatus using a background light amount control technique according to an embodiment of the present invention;
KR1020160027255A 2016-03-07 2016-03-07 A Touch Sensing Apparatus and Method of Using the Background Intensity Control Technology KR101792397B1 (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2003316515A (en) 2002-04-19 2003-11-07 Toshiba Corp Display area specifying device
JP2004185283A (en) * 2002-12-03 2004-07-02 Canon Inc Optical coordinate input device
JP2006047247A (en) 2004-08-09 2006-02-16 Denso Corp Noncontact-type detecting device and control device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003316515A (en) 2002-04-19 2003-11-07 Toshiba Corp Display area specifying device
JP2004185283A (en) * 2002-12-03 2004-07-02 Canon Inc Optical coordinate input device
JP2006047247A (en) 2004-08-09 2006-02-16 Denso Corp Noncontact-type detecting device and control device

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