CN112527156B - Infrared multi-point touch identification method, device and system based on conference tablet - Google Patents
Infrared multi-point touch identification method, device and system based on conference tablet Download PDFInfo
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- CN112527156B CN112527156B CN202011560248.5A CN202011560248A CN112527156B CN 112527156 B CN112527156 B CN 112527156B CN 202011560248 A CN202011560248 A CN 202011560248A CN 112527156 B CN112527156 B CN 112527156B
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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
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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Abstract
The invention discloses an infrared multi-point touch identification method, device and system based on a conference tablet, wherein the method comprises the following steps: a coded infrared transmitting tube arranged on the screen transmits coded infrared light signals to an opposite coded infrared receiving tube in real time; the controller judges whether the coded infrared receiver has a coded infrared signal to be received blocked in the positive direction or not; if so, acquiring a rectangular area of the blocked coordinates; the controller analyzes the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals; positioning calculation is carried out on the basis of the codes of the coded infrared light signals and the incident angles of the coded infrared light signals on the coded infrared receiving tubes, and coordinates of reflection points of the coded infrared light signals are obtained; and identifying and positioning the touch area based on the rectangular area and the coordinates of the reflection point of the coded infrared light signal. In the embodiment of the invention, the touch area of the infrared multi-point touch can be accurately identified, and the touch precision is improved.
Description
Technical Field
The invention relates to the technical field of infrared touch, in particular to an infrared multi-point touch identification method, device and system based on a conference tablet.
Background
The infrared touch screen detects and locates the touch of a user by using an X, Y-direction densely-distributed infrared matrix. The infrared touch screen is provided with a circuit board outer frame in front of the display, and the circuit board is provided with infrared transmitting tubes and infrared receiving tubes on four sides of the screen, so that infrared matrixes which are crossed transversely and vertically are formed in a one-to-one correspondence mode. Because the existing infrared touch screen forms a rectangular area for the touch area, the touch area of a user cannot be accurately determined, and the user experience is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an infrared multi-point touch identification method, device and system based on a conference tablet, which can realize accurate identification of a touch area of infrared multi-point touch and improve touch accuracy.
In order to solve the above technical problem, an embodiment of the present invention provides an infrared multi-point touch identification method based on a conference tablet, where the method includes:
a coded infrared transmitting tube arranged on a screen of the conference flat plate transmits coded infrared light signals to an opposite coded infrared receiving tube in real time;
the controller arranged in the conference tablet judges whether the coded infrared receiver has a coded infrared signal to be received blocked in the positive direction;
if so, positioning the blocked coordinates to obtain a rectangular area of the blocked coordinates;
a controller arranged in the conference panel analyzes the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals;
positioning calculation is carried out on the basis of the codes of the coded infrared light signals and the incident angles of the coded infrared light signals on the coded infrared receiving tubes, and coordinates of reflecting points of the coded infrared light signals are obtained;
and identifying and positioning the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal.
Optionally, the frame on one side of the screen of the conference flat plate is sequentially provided with the coded infrared transmitting tubes and the coded infrared receiving tubes at intervals, and the frame on the opposite side of the screen of the conference flat plate is sequentially provided with the coded infrared receiving tubes and the coded infrared transmitting tubes at intervals; and a coding infrared transmitting tube is arranged on one of two corresponding sides of the screen frame of the conference flat plate, and a coding infrared receiving tube is arranged on the other corresponding position.
Optionally, the locating the blocked coordinates to obtain a rectangular region of the blocked coordinates includes:
determining blocked coordinates according to the positions of the coded infrared transmitting tubes or the coded infrared receiving tubes of the blocked coded infrared light signals on the border of the screen;
and obtaining a rectangular area of the blocked coordinates according to the blocked coordinates.
Optionally, the analyzing, by the controller built in the conference tablet, the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals includes:
and the conference panel issues the coded infrared light signals received by all the coded infrared receivers to a built-in controller thereof, and the controller analyzes the coded infrared light signals to obtain the codes of the coded infrared light signals.
Optionally, the performing a positioning calculation based on the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube includes:
constructing a triangle based on the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube;
and positioning and calculating the triangle by using the cosine theorem of the trigonometric function.
Optionally, the incident angle of the coded infrared receiving tube is obtained by recording when the coded infrared receiving tube receives the coded infrared light signal.
Optionally, the identifying and positioning of the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal includes:
determining whether the rectangular area of the blocked coordinates is overlapped with a touch area formed by coordinates of reflection points of the coded infrared light signals, and if so, obtaining the touch area formed by coordinates of the reflection points of the coded infrared light signals;
and identifying and positioning the touch area based on the touch area formed by the coordinates of the reflection points of the coded infrared light signals.
In addition, an embodiment of the present invention further provides an infrared multi-touch recognition device based on a conference tablet, where the device includes:
a sending module: the coded infrared transmitting tube arranged on the screen of the conference flat plate transmits coded infrared light signals to the opposite coded infrared receiving tube in real time;
a judging module: the controller built in the conference tablet judges whether the coded infrared receiver has a coded infrared light signal to be received blocked in the positive direction;
forming a module: if so, positioning the blocked coordinates to obtain a rectangular area of the blocked coordinates;
an analysis module: the controller arranged in the conference tablet analyzes the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals;
a calculation module: the infrared receiving device is used for carrying out positioning calculation on the basis of the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube to obtain the coordinates of the reflection point of the coded infrared light signal;
the identification and positioning module: the touch area recognition and positioning device is used for recognizing and positioning the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal.
In addition, an embodiment of the present invention further provides an infrared multi-touch recognition system based on a conference tablet, where the system includes: the conference system comprises a screen of a conference flat plate, a controller, a coding infrared emission tube and a coding infrared, wherein the coding infrared emission tube and the coding infrared are arranged on the screen; wherein,
the conference tablet is configured to perform the infrared multi-touch recognition method described in any one of the above.
In the embodiment of the invention, the touch area of the infrared multi-point touch can be accurately identified, and the touch precision is improved, so that the use experience of a user is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of an infrared multi-touch identification method based on a conference tablet in an embodiment of the present invention;
fig. 2 is a schematic structural composition diagram of an infrared multi-touch recognition device based on a conference tablet in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating an infrared multi-touch identification method based on a conference tablet according to an embodiment of the present invention.
As shown in fig. 1, an infrared multi-touch identification method based on a conference tablet includes:
s11: a coded infrared transmitting tube arranged on a screen of the conference flat plate transmits coded infrared light signals to an opposite coded infrared receiving tube in real time;
in the specific implementation process of the invention, the coded infrared transmitting tubes and the coded infrared receiving tubes are sequentially arranged at intervals on the frame on one side of the screen of the conference flat plate, and the coded infrared receiving tubes and the coded infrared transmitting tubes are sequentially arranged at intervals on the frame on the opposite side of the screen of the conference flat plate; and a coding infrared transmitting tube is arranged on one of two corresponding sides of the screen frame of the conference flat plate, and a coding infrared receiving tube is arranged on the other corresponding position.
Specifically, a coded infrared transmitting tube and a coded infrared receiving tube are arranged on a screen of the conference flat plate, wherein the arrangement mode is that the coded infrared transmitting tube and the coded infrared receiving tube are sequentially arranged on a side frame on one side of the screen at intervals, and the coded infrared receiving tube and the coded infrared transmitting tube are sequentially arranged on a side frame on the opposite side of the screen of the conference flat plate at intervals; one side of the two corresponding sides of the screen frame is provided with a coding infrared transmitting tube, and the other side is provided with a coding infrared receiving tube at the corresponding position.
Then the screen of the conference flat plate sends coded infrared light signals to the opposite coded infrared receiving tubes in real time through the arranged coded infrared transmitting tubes.
S12: the controller arranged in the conference tablet judges whether the coded infrared receiver has a coded infrared signal to be received blocked in the positive direction;
in the specific implementation process of the invention, whether the coded infrared receiver has a coded infrared signal to be received in the positive direction to be blocked is judged by a controller arranged in the conference tablet; the controller judges whether the codes of the corresponding coded infrared transmitting tubes are consistent or not according to the coded infrared light signals received by the coded infrared receiver; when one coded infrared receiver receives a plurality of coded infrared signals at the same time, the strongest coded infrared signal is selected for confirmation.
S13: if so, positioning the blocked coordinates to obtain a rectangular area of the blocked coordinates;
in the specific implementation process of the present invention, the locating the blocked coordinates to obtain a rectangular area of the blocked coordinates includes: determining blocked coordinates according to the positions of the coded infrared transmitting tubes or the coded infrared receiving tubes of the blocked coded infrared light signals on the border of the screen; and obtaining a rectangular area of the blocked coordinates according to the blocked coordinates.
Specifically, the blocked coordinates are determined according to the positions of the coded infrared transmitting tubes or the coded infrared receiving tubes of the blocked coded infrared light signals on the border of the screen, and the corresponding position coordinates are calibrated while the coded infrared transmitting tubes and the coded infrared receiving tubes are arranged on the screen of the conference all-in-one machine, so that the blocked coordinates can be determined; so that a rectangular area of blocked coordinates can be obtained from the blocked coordinates.
S14: a controller arranged in the conference panel analyzes the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals;
in a specific implementation process of the present invention, the analyzing, by a controller built in the conference tablet, the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals includes: and the conference panel issues the coded infrared light signals received by all the coded infrared receivers to a built-in controller thereof, and the controller analyzes the coded infrared light signals to obtain the codes of the coded infrared light signals.
Specifically, the conference tablet issues the coded infrared light signals received by all the coded infrared receivers to a built-in controller thereof, and the controller analyzes the coded infrared light signals, so as to obtain the codes of the coded infrared light signals.
S15: positioning calculation is carried out on the basis of the codes of the coded infrared light signals and the incident angles of the coded infrared light signals on the coded infrared receiving tubes, and coordinates of reflecting points of the coded infrared light signals are obtained;
in a specific implementation process of the present invention, the performing a positioning calculation based on the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube includes: constructing a triangle based on the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube; and positioning and calculating the triangle by using the cosine theorem of the trigonometric function.
Further, the incident angle of the coded infrared receiving tube is obtained by recording the coded infrared receiving tube when receiving the coded infrared light signal.
Specifically, a corresponding triangle is constructed according to the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube; in the triangle, at least one angle datum and a plurality of edges can be known through calculation, and the triangle can be positioned and calculated by utilizing the cosine law of the trigonometric function.
And the incident angle of the coded infrared receiving tube is obtained by recording the coded infrared receiving tube when the coded infrared light signal is received.
S16: and identifying and positioning the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal.
In a specific implementation process of the present invention, the identifying and positioning of the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal includes: determining whether the rectangular area of the blocked coordinates is overlapped with a touch area formed by coordinates of reflection points of the coded infrared light signals, and if so, obtaining the touch area formed by coordinates of the reflection points of the coded infrared light signals; and identifying and positioning the touch area based on the touch area formed by the coordinates of the reflection points of the coded infrared light signals.
Specifically, because there may be simultaneous multi-touch, it is necessary to determine whether the rectangular area of the blocked coordinates overlaps with the touch area formed by the coordinates of the reflection point of the coded infrared light signal, and if so, obtain the touch area formed by the coordinates of the reflection point of the coded infrared light signal; and identifying and positioning the touch area according to the touch area formed by the coordinates of the reflection points of the coded infrared light signals. Under the condition of non-overlapping, the touch area needs to be matched with the overlapping area, and the touch area is identified and positioned; otherwise, the positioning is identified to fail.
In the embodiment of the invention, the touch area of the infrared multi-point touch can be accurately identified, and the touch precision is improved, so that the use experience of a user is improved.
Examples
Referring to fig. 2, fig. 2 is a schematic structural composition diagram of an infrared multi-touch recognition device based on a conference tablet in an embodiment of the present invention.
As shown in fig. 2, an infrared multi-touch recognition device based on a conference tablet includes:
the sending module 21: the coded infrared transmitting tube arranged on the screen of the conference flat plate transmits coded infrared light signals to the opposite coded infrared receiving tube in real time;
in the specific implementation process of the invention, the coded infrared transmitting tubes and the coded infrared receiving tubes are sequentially arranged at intervals on the frame on one side of the screen of the conference flat plate, and the coded infrared receiving tubes and the coded infrared transmitting tubes are sequentially arranged at intervals on the frame on the opposite side of the screen of the conference flat plate; and a coding infrared transmitting tube is arranged on one of two corresponding sides of the screen frame of the conference flat plate, and a coding infrared receiving tube is arranged on the other corresponding position.
Specifically, a coded infrared transmitting tube and a coded infrared receiving tube are arranged on a screen of the conference flat plate, wherein the arrangement mode is that the coded infrared transmitting tube and the coded infrared receiving tube are sequentially arranged on a side frame on one side of the screen at intervals, and the coded infrared receiving tube and the coded infrared transmitting tube are sequentially arranged on a side frame on the opposite side of the screen of the conference flat plate at intervals; one side of the two corresponding sides of the screen frame is provided with a coding infrared transmitting tube, and the other side is provided with a coding infrared receiving tube at the corresponding position.
Then the screen of the conference flat plate sends coded infrared light signals to the opposite coded infrared receiving tubes in real time through the arranged coded infrared transmitting tubes.
The judging module 22: the controller built in the conference tablet judges whether the coded infrared receiver has a coded infrared light signal to be received blocked in the positive direction;
in the specific implementation process of the invention, whether the coded infrared receiver has a coded infrared signal to be received in the positive direction to be blocked is judged by a controller arranged in the conference tablet; the controller judges whether the codes of the corresponding coded infrared transmitting tubes are consistent or not according to the coded infrared light signals received by the coded infrared receiver; when one coded infrared receiver receives a plurality of coded infrared signals at the same time, the strongest coded infrared signal is selected for confirmation.
Forming a module 23: if so, positioning the blocked coordinates to obtain a rectangular area of the blocked coordinates;
in the specific implementation process of the present invention, the locating the blocked coordinates to obtain a rectangular area of the blocked coordinates includes: determining blocked coordinates according to the positions of the coded infrared transmitting tubes or the coded infrared receiving tubes of the blocked coded infrared light signals on the border of the screen; and obtaining a rectangular area of the blocked coordinates according to the blocked coordinates.
Specifically, the blocked coordinates are determined according to the positions of the coded infrared transmitting tubes or the coded infrared receiving tubes of the blocked coded infrared light signals on the border of the screen, and the corresponding position coordinates are calibrated while the coded infrared transmitting tubes and the coded infrared receiving tubes are arranged on the screen of the conference all-in-one machine, so that the blocked coordinates can be determined; so that a rectangular area of blocked coordinates can be obtained from the blocked coordinates.
The analysis module 24: the controller arranged in the conference tablet analyzes the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals;
in a specific implementation process of the present invention, the analyzing, by a controller built in the conference tablet, the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals includes: and the conference panel issues the coded infrared light signals received by all the coded infrared receivers to a built-in controller thereof, and the controller analyzes the coded infrared light signals to obtain the codes of the coded infrared light signals.
Specifically, the conference tablet issues the coded infrared light signals received by all the coded infrared receivers to a built-in controller thereof, and the controller analyzes the coded infrared light signals, so as to obtain the codes of the coded infrared light signals.
The calculation module 25: the infrared receiving device is used for carrying out positioning calculation on the basis of the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube to obtain the coordinates of the reflection point of the coded infrared light signal;
in a specific implementation process of the present invention, the performing a positioning calculation based on the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube includes: constructing a triangle based on the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube; and positioning and calculating the triangle by using the cosine theorem of the trigonometric function.
Further, the incident angle of the coded infrared receiving tube is obtained by recording the coded infrared receiving tube when receiving the coded infrared light signal.
Specifically, a corresponding triangle is constructed according to the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube; in the triangle, at least one angle datum and a plurality of edges can be known through calculation, and the triangle can be positioned and calculated by utilizing the cosine law of the trigonometric function.
And the incident angle of the coded infrared receiving tube is obtained by recording the coded infrared receiving tube when the coded infrared light signal is received.
The identification and positioning module 26: the touch area recognition and positioning device is used for recognizing and positioning the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal.
In a specific implementation process of the present invention, the identifying and positioning of the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal includes: determining whether the rectangular area of the blocked coordinates is overlapped with a touch area formed by coordinates of reflection points of the coded infrared light signals, and if so, obtaining the touch area formed by coordinates of the reflection points of the coded infrared light signals; and identifying and positioning the touch area based on the touch area formed by the coordinates of the reflection points of the coded infrared light signals.
Specifically, because there may be simultaneous multi-touch, it is necessary to determine whether the rectangular area of the blocked coordinates overlaps with the touch area formed by the coordinates of the reflection point of the coded infrared light signal, and if so, obtain the touch area formed by the coordinates of the reflection point of the coded infrared light signal; and identifying and positioning the touch area according to the touch area formed by the coordinates of the reflection points of the coded infrared light signals. Under the condition of non-overlapping, the touch area needs to be matched with the overlapping area, and the touch area is identified and positioned; otherwise, the positioning is identified to fail.
In the embodiment of the invention, the touch area of the infrared multi-point touch can be accurately identified, and the touch precision is improved, so that the use experience of a user is improved.
Examples
The invention also provides an infrared multi-point touch identification system based on the conference tablet, which is characterized by comprising the following components: the conference system comprises a screen of a conference flat plate, a controller, a coding infrared emission tube and a coding infrared, wherein the coding infrared emission tube and the coding infrared are arranged on the screen; wherein,
the conference tablet is configured to perform the infrared multi-touch recognition method described in any one of the above.
The real-time mode of the system items can be referred to the above embodiments and will not be described herein.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, or the like.
In addition, the method, the device and the system for infrared multi-point touch identification based on a conference tablet provided by the embodiment of the invention are introduced in detail, a specific embodiment is adopted herein to explain the principle and the implementation manner of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. An infrared multi-point touch identification method based on a conference tablet is characterized by comprising the following steps:
a coded infrared transmitting tube arranged on a screen of the conference flat plate transmits coded infrared light signals to an opposite coded infrared receiving tube in real time;
the controller arranged in the conference tablet judges whether the coded infrared receiver has a coded infrared signal to be received blocked in the positive direction;
if so, positioning the blocked coordinates to obtain a rectangular area of the blocked coordinates;
a controller arranged in the conference panel analyzes the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals;
positioning calculation is carried out on the basis of the codes of the coded infrared light signals and the incident angles of the coded infrared light signals on the coded infrared receiving tubes, and coordinates of reflecting points of the coded infrared light signals are obtained;
identifying and positioning a touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal;
the frame on one side of the screen of the conference flat plate is sequentially provided with coded infrared transmitting tubes and coded infrared receiving tubes at intervals, and the frame on the opposite side of the screen of the conference flat plate is sequentially provided with coded infrared receiving tubes and coded infrared transmitting tubes at intervals; a coded infrared transmitting tube is arranged on one of two sides of the conference flat plate corresponding to the screen frame, and a coded infrared receiving tube is arranged on the other side of the conference flat plate corresponding to the screen frame;
the positioning the blocked coordinates to obtain a rectangular area of the blocked coordinates, including:
determining blocked coordinates according to the positions of the coded infrared transmitting tubes or the coded infrared receiving tubes of the blocked coded infrared light signals on the border of the screen;
obtaining a rectangular area of the blocked coordinates according to the blocked coordinates;
the identifying and positioning of the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal comprises:
determining whether the rectangular area of the blocked coordinates is overlapped with a touch area formed by coordinates of reflection points of the coded infrared light signals, and if so, obtaining the touch area formed by coordinates of the reflection points of the coded infrared light signals;
and identifying and positioning the touch area based on the touch area formed by the coordinates of the reflection points of the coded infrared light signals.
2. The infrared multi-touch identification method of claim 1, wherein the step of analyzing the coded infrared light signals received by all the coded infrared receivers by the controller built in the conference tablet to obtain the codes of the coded infrared light signals comprises:
and the conference panel issues the coded infrared light signals received by all the coded infrared receivers to a built-in controller thereof, and the controller analyzes the coded infrared light signals to obtain the codes of the coded infrared light signals.
3. The infrared multi-touch recognition method of claim 1, wherein the performing of the positioning calculation based on the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube comprises:
constructing a triangle based on the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube;
and positioning and calculating the triangle by using the cosine theorem of the trigonometric function.
4. The infrared multi-touch recognition method of claim 1 or 3, wherein the incident angle of the coded infrared receiving tube is obtained by recording the coded infrared receiving tube when receiving the coded infrared light signal.
5. An infrared multi-touch recognition device based on a conference tablet, the device comprising:
a sending module: the coded infrared transmitting tube arranged on the screen of the conference flat plate transmits coded infrared light signals to the opposite coded infrared receiving tube in real time;
a judging module: the controller built in the conference tablet judges whether the coded infrared receiver has a coded infrared light signal to be received blocked in the positive direction;
forming a module: if so, positioning the blocked coordinates to obtain a rectangular area of the blocked coordinates;
an analysis module: the controller arranged in the conference tablet analyzes the coded infrared light signals received by all the coded infrared receivers to obtain codes of the coded infrared light signals;
a calculation module: the infrared receiving device is used for carrying out positioning calculation on the basis of the code of the coded infrared light signal and the incident angle of the coded infrared light signal on the coded infrared receiving tube to obtain the coordinates of the reflection point of the coded infrared light signal;
the identification and positioning module: the touch control system is used for identifying and positioning a touch control area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal;
the frame on one side of the screen of the conference flat plate is sequentially provided with coded infrared transmitting tubes and coded infrared receiving tubes at intervals, and the frame on the opposite side of the screen of the conference flat plate is sequentially provided with coded infrared receiving tubes and coded infrared transmitting tubes at intervals; a coded infrared transmitting tube is arranged on one of two sides of the conference flat plate corresponding to the screen frame, and a coded infrared receiving tube is arranged on the other side of the conference flat plate corresponding to the screen frame;
the positioning the blocked coordinates to obtain a rectangular area of the blocked coordinates, including:
determining blocked coordinates according to the positions of the coded infrared transmitting tubes or the coded infrared receiving tubes of the blocked coded infrared light signals on the border of the screen;
obtaining a rectangular area of the blocked coordinates according to the blocked coordinates;
the identifying and positioning of the touch area based on the rectangular area of the blocked coordinates and the coordinates of the reflection point of the coded infrared light signal comprises:
determining whether the rectangular area of the blocked coordinates is overlapped with a touch area formed by coordinates of reflection points of the coded infrared light signals, and if so, obtaining the touch area formed by coordinates of the reflection points of the coded infrared light signals;
and identifying and positioning the touch area based on the touch area formed by the coordinates of the reflection points of the coded infrared light signals.
6. An infrared multi-touch recognition system based on a conference tablet, the system comprising: the device comprises a screen of a conference flat plate, a controller, a coding infrared transmitting tube and a coding infrared receiving tube, wherein the coding infrared transmitting tube and the coding infrared receiving tube are arranged on the screen; wherein,
the conference tablet is configured for performing the infrared multi-touch recognition method according to any one of claims 1-4.
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| CN103970367A (en) * | 2013-11-21 | 2014-08-06 | 郭轩 | Stereoscopic vision based multi-point touch screen system |
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