CN210324163U - Multi-optical fiber touch sensing device based on image processing technology - Google Patents
Multi-optical fiber touch sensing device based on image processing technology Download PDFInfo
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- CN210324163U CN210324163U CN201921350979.XU CN201921350979U CN210324163U CN 210324163 U CN210324163 U CN 210324163U CN 201921350979 U CN201921350979 U CN 201921350979U CN 210324163 U CN210324163 U CN 210324163U
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Abstract
The utility model discloses a many optical fiber touch sensing device based on image processing technique, send light optic fibre, casing, a plurality of photic optic fibre, image acquisition module and processing module including light source, even slide, a plurality of, be equipped with a plurality of through hole on the casing, a plurality of through hole evenly distributed is in on the surface of casing, send the quantity homogeneous phase of light optic fibre, photic optic fibre and through hole, a plurality of send light optic fibre, a plurality of photic optic fibre with a plurality of through hole one-to-one sets up, send the output of light optic fibre with the input of photic optic fibre is fixed in the through hole. The utility model discloses sensing device is for the touch sensing detection device based on optic fibre, and to electromagnetic interference immunity, the interference killing feature to the temperature is strong, simple structure, the simple process of preparation and processing.
Description
Technical Field
The utility model relates to an optic fibre touch sensing technical field, more specifically say and relate to many optic fibre touch sensing device based on image processing technique.
Background
The touch sensor is widely applied to a plurality of fields such as smart phones, computers, smart home control systems, industrial control systems and the like as a human interface device (human interface device). The traditional capacitive touch sensor works by utilizing the capacitive coupling effect induction of a human body, has long service life and can usually support multi-point touch, but the preparation of the traditional capacitive touch sensor needs a micro-electro-mechanical processing technology, so that the process is complex and the cost is relatively high. In addition, the capacitive touch sensor is susceptible to signal misjudgment caused by water drops and sweat on the surface of the capacitive touch sensor. The infrared optical touch sensor is also commonly used in various touch sensing control systems, when a user touches an infrared touch screen, a finger can block two infrared rays passing through the position, and the controller can judge the position of a touch point through calculation. However, the infrared touch sensor is easily interfered by various heat sources and sunlight sources, and if strong infrared electromagnetic wave interference exists in the detection environment, the detection accuracy and sensitivity of the infrared touch sensor are reduced to a certain extent, and even signal misreading and misjudgment can occur.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that the type will be solved is: the existing touch sensor has the disadvantages of complex structure, higher manufacturing cost and poor interference resistance.
The utility model provides a many optical fiber touch sensing device based on image processing technique improves interference killing feature and detection accuracy.
The utility model provides a solution of its technical problem is:
the multi-optical-fiber touch sensing device based on the image processing technology comprises a light source, a light homogenizing sheet, a plurality of light sending optical fibers, a shell, a plurality of light receiving optical fibers, an image acquisition module and a processing module, wherein the shell is provided with a plurality of through holes, the through holes are uniformly distributed on the outer surface of the shell, the light sending optical fibers, the light receiving optical fibers and the through holes are the same in number, the light sending optical fibers, the light receiving optical fibers and the through holes are arranged in a one-to-one correspondence manner, and the output ends of the light sending optical fibers and the input ends of the light receiving optical fibers are fixed in the through holes;
the light source comprises a light source, a light receiving optical fiber, an image acquisition module, a processing module and a light homogenizing sheet, wherein light beams emitted by the light source enter the light transmitting optical fiber through the input end of the light transmitting optical fiber after passing through the light homogenizing sheet, the image acquisition module acquires emergent light at the output end of the light receiving optical fiber, the image acquisition module is electrically connected with the processing module, and the processing module is used for processing image information acquired by the image acquisition module.
As a further improvement of the technical scheme, the fiber core diameters of the light transmitting fiber and the light receiving fiber are both 8-980 mu m.
As a further improvement of the technical scheme, the diameters of the cladding layers of the light transmitting fiber and the light receiving fiber are both 125-1000 μm.
As a further improvement of the technical scheme, the light source is an infrared light emitting diode.
As a further improvement of the technical scheme, the image acquisition module is an infrared camera.
As a further improvement of the above technical solution, the processing module is a computer processing terminal.
The utility model has the advantages that: the utility model discloses sensing device is for the touch sensing detection device based on optic fibre, and to electromagnetic interference immunity, the interference killing feature to the temperature is strong, simple structure, the simple process of preparation and processing.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
FIG. 1 is a schematic structural diagram of a sensing device according to the present embodiment;
FIG. 2 is a schematic view of the connection structure of the light source, the light homogenizing sheet and the beam-collecting end of the light-transmitting fiber;
FIG. 3 is a schematic view of a connection structure of a light receiving optical fiber and an infrared camera;
fig. 4 is a flowchart of processing steps of the control method in the present embodiment.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the accompanying drawings, so as to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Embodiment 1, referring to fig. 1, a multi-fiber touch sensor based on an image processing technology includes a light source 100, a light homogenizing sheet 200, a plurality of light-transmitting fibers 300, a housing 500, a plurality of light-receiving fibers 400, an image acquisition module 600, and a processing module 700, where the housing 500 is provided with a plurality of through holes 501, the through holes 501 are uniformly distributed on an outer surface of the housing 500, the light-transmitting fibers 300, the light-receiving fibers 400, and the through holes 501 are equal in number, the light-transmitting fibers 300, the light-receiving fibers 400, and the through holes 501 are arranged in a one-to-one correspondence manner, and an output end of the light-transmitting fibers 300 and an input end of the light-receiving fibers 400 are fixed in the through holes 501;
the light source 100 emits light beams which pass through the light homogenizing sheet 200 and then enter the light transmitting optical fiber 300 through the input end of the light transmitting optical fiber 300, the image acquisition module 600 acquires emergent light at the output end of the light receiving optical fiber 400, the image acquisition module 600 is electrically connected with the processing module 700, and the processing module 700 is used for processing image information acquired by the image acquisition module 600.
The input end of the light transmitting optical fiber 300 is made into a first bundle 301, the first bundle is inserted into a polyethylene sleeve and fixed by epoxy resin glue, and the bundle end of the light transmitting optical fiber 300 is cut and polished on polishing paper to enable the end face to be flush. The bundle end of the light transmitting fibers 300 is used for receiving the light emitted by the light source 100, and each input end of the plurality of light transmitting fibers 300 passes through the inside of the housing 500 and is correspondingly and fixedly installed in the through hole 501 of the housing 500.
Referring to fig. 2, the light source 100, the light homogenizing sheet 200 and the bundling end of the light transmitting fiber 300 are coaxially and sequentially placed in a first fixture 800, and fixed in the first fixture 800 by epoxy resin glue, and the light homogenizing sheet 200 is placed between the bundling end of the light transmitting fiber 300 and the light source 100.
The output end of the light receiving fiber 400 is inserted into a heat shrinkable tube to form a second bundle 401, the second bundle is heated and fixed in the heat shrinkable tube, the bundle end of the light receiving fiber 400 is inserted into a polyethylene sleeve and fixed by epoxy resin glue, and the bundle end of the light receiving fiber 400 is cut and polished on polishing paper to enable the end faces to be flush.
The light receiving fibers 400 are used for transmitting the light signals reflected by the touch object to the image acquisition module 600, and each input end of the light receiving fibers 400 penetrates through the inside of the casing 500 and is correspondingly and fixedly installed in the through hole 501 of the casing 500.
The touch object is a barrier placed on the outer surface of the housing 500, and the touch object in this embodiment is a finger.
The housing 500 is hollow, and a plurality of through holes 501 are uniformly distributed on the outer surface. A light transmitting fiber 300 and a light receiving fiber 400 are fixed to each through hole 501. The housing 500 is hemispherical in this embodiment. In this embodiment, the diameter of the hemispherical shell 500 is in the range of 3-20cm, and the diameter of the through hole 501 is in the range of 0.5-3 mm.
When a touch body is arranged on the outer surface of the housing 500, light output by the light transmitting fiber 300 is reflected at the touch body, and the light is reflected to the light receiving fiber 400 close to the touch body, that is, the light receiving fiber 400 corresponding to the light transmitting fiber 300 reflecting the output light, the light receiving fiber 400 transmits the received light signal to the image acquisition module 600, the image acquisition module 600 converts the received light signal into image information and transmits the image information to the processing module 700, and the processing module 700 processes the received image information and determines the touch gesture of the touch body. The touch object in this embodiment is a finger.
The utility model discloses sensing device is for the touch sensing detection device based on optic fibre, and to electromagnetic interference immunity, the interference killing feature is strong, can be applied to in the environment that has electromagnetic interference and in the inflammable and explosive environment. The sensing device has simple structure and simple preparation and processing technology.
In a further preferred embodiment, an end surface of the output end of the light transmitting fiber 300 is flush with the outer surface of the housing 500, and an end surface of the input end of the light receiving fiber 400 is flush with the outer surface of the housing 500.
In a further preferred embodiment, the core diameters of the light transmitting fiber 300 and the light receiving fiber 400 are both 8 to 980 μm.
In a more preferred embodiment, the cladding diameters of the light transmitting fiber 300 and the light receiving fiber 400 are both 125 to 1000 μm.
Preferably, the diameter of the core of each light transmitting fiber 300 is in the range of 50-200 μm, and the diameter of the cladding is in the range of 125-250 μm.
Further, in a preferred embodiment, the light source 100 is an infrared light emitting diode.
In a further preferred embodiment, the processing module 700 is a computer processing terminal.
Further, in a preferred embodiment, the image capturing module 600 is an infrared camera.
The optical lens group of the infrared camera comprises the long-wave infrared filter, so that optical signals in a visible wavelength range can be filtered, and the influence of ambient light around the sensor on a detection result is effectively reduced. And inputting the electric signal output by the infrared camera into a computer processing terminal to perform image processing by using a Labview program.
Referring to fig. 3, the bundle end of the light receiving fiber 400 and the infrared camera are placed in a second jig 900 and fixed by epoxy glue. The infrared camera is a zoom camera, and before the infrared camera is fixed in the second fixture 900, the focal length of the infrared camera and the relative position of the infrared camera and the light receiving optical fiber 400 need to be adjusted, so that the output end of the light receiving optical fiber 400 can clearly image on the photosensitive element inside the infrared camera.
Referring to fig. 4, the image processing technology-based multi-fiber touch sensor device further includes an image processing technology-based multi-fiber touch control method, the method including:
the light beam emitted by the light source 100 enters the light-transmitting optical fiber 300 after passing through the light homogenizing sheet 200, and the light beam is output to the outer surface of the shell 500 by the light-transmitting optical fiber 300;
the image acquisition module 600 acquires an optical signal output by the light receiving fiber 400 in advance when no touch object is present on the outer surface of the housing 500, and obtains a background image;
when a touch body is arranged on the outer surface of the shell 500, light output by the light-transmitting optical fiber 300 is reflected at the touch body, the light is reflected and input into the light-receiving optical fiber 400, the image acquisition module 600 acquires the light output by the light-receiving optical fiber 400 to obtain an image to be detected, and the light output by the light-receiving optical fiber 400 forms a light spot on the image to be detected;
when the light is input to the light receiving fiber 400, the light receiving fiber 400 is lit.
Denoising by subtracting the background image from an image to be measured;
and selecting a touch gesture judgment type, detecting corresponding parameters of light spots in the denoised image according to different touch gesture judgment types, and judging the touch gesture.
The touch gesture judgment type comprises user-defined touch gesture judgment and single-point or multi-point touch gesture judgment.
The working principle of the embodiment is as follows:
the light emitted by the light source 100 enters the light transmitting fiber 300 after passing through the light homogenizing function of the light homogenizing sheet 200, and the light output by the light transmitting fiber 300 is used for detecting whether a touch object is on the outer surface of the shell 500. When a touch object is located on the outer surface of the housing 500, the light output from the light transmitting fiber 300 is reflected by the touch object on the outer surface of the housing 500, and the reflected light enters the light receiving fiber 400 in the same through hole 501, so that the light receiving fiber 400 is lighted. The light receiving fiber 400 transmits light to the image collecting module 600, and the image collecting module 600 converts the collected light signal into image information and transmits the image information to the processing module 700 for processing and analysis. The processing module 700 in this embodiment is a computer processing terminal.
The image acquisition module 600 acquires an optical signal output by the light receiving fiber 400 in advance when no touch object is present on the outer surface of the housing 500, and obtains a background image;
the background image is an image formed by all light rays output by the light receiving fibers 400 captured by the image capturing module 600 when the light receiving fibers 400 are not lit.
When a touch body is arranged on the outer surface of the housing 500, light output by the light-transmitting optical fiber 300 is reflected at the touch body, the light is reflected and input into the light-receiving optical fiber 400 to light the light-receiving optical fiber 400, the image acquisition module 600 acquires the light output by the light-receiving optical fiber 400 to obtain an image to be detected, and the lighted light-receiving optical fiber 400 forms a light spot on the image to be detected;
the processing and analyzing process of the computer processing terminal comprises the following steps:
and denoising the image to be detected by subtracting the background image.
In the image collected by the image collecting module 600, only the light receiving fibers 400 in the through holes 501 that are lit have high-intensity luminance output, and the light receiving fibers 400 in the other through holes 501 output light as background noise. And subtracting the gray value of the corresponding background image from the gray value of each pixel in the pixel matrix contained in the image to be detected. The gray value of the background image is the gray value of each pixel in the background image captured by the image acquisition module 600 when the light-free optical fiber 400 is lighted.
The influence of noise light signals in the surrounding environment on touch detection is greatly reduced by the denoising method.
And after denoising, selecting a touch gesture judgment type, detecting corresponding parameters of light spots in the denoised image according to different touch gesture judgment types, and judging the touch gesture.
The touch gesture judgment type comprises user-defined touch gesture judgment and single-point or multi-point touch gesture judgment. Different corresponding operation instructions executed after different touch gestures are detected are preset in the computer processing terminal.
When the single-point or multi-point touch gesture judgment is selected, the computer processing terminal only judges the number of the light spots.
When the computer processing terminal detects that the number of the light spots is 1, the light spots are judged to be a single-point triggering gesture, and a Labview program in the computer processing terminal can output a preset first operation instruction through a communication interface of the computer processing terminal.
When the computer processing terminal detects that the number of the light spots exceeds 1, the multipoint triggering gesture is judged, and a Labview program in the computer processing terminal can output a preset second operation instruction through a communication interface of the computer processing terminal.
When the user-defined touch gesture judgment is selected, the computer processing terminal needs to judge the number of the light spots, the positions of the light spots and the appearance sequence of the light spots.
The user-defined touch gesture judgment needs to preset the circle center position of the light spots, the number of the light spots and the appearance sequence of the light spots in a register of the computer processing terminal according to requirements. When the computer processing terminal detects that the circle center position of the light spots on the de-noised image, the number of the light spots and the appearance sequence of the light spots are consistent with preset values, the Labview program in the computer processing terminal can output an operation instruction through a communication interface of the computer processing terminal.
The user-defined touch gesture in this embodiment includes a left touch gesture and a right touch gesture, and when the number of detected light spots exceeds one, and the sequence of the light spots is from left to right, it is determined as the left touch gesture. When the computer processing terminal detects the left touch gesture, a Labview program in the computer processing terminal can output a preset third operation instruction through a communication interface of the computer processing terminal, and the computer processing terminal controls a corresponding execution module to execute the preset third operation instruction.
And detecting through a Labview program of the computer processing terminal, detecting the number and the position of the light spots in the denoised image and the appearance sequence of the light spots, and judging the touch gesture.
In this embodiment, the detection process of the Labview program of the computer processing terminal:
the image acquisition module 600 acquires the to-be-detected image after the light receiving fibers 400 are lighted in real time, and the sequence of the light spots can be obtained. And then, iteratively dividing the outline of the light spot of the denoised image by adopting an image binarization optimal threshold value, positioning the size of the light spot by a pixel-by-pixel iterative mean value method, and finally, taking the mean value by surrounding pixel points around the circle center to position the position of the circle center of the light spot and the number of the light spots.
When the computer processing terminal detects the position and the number of the light spots and the appearance sequence of the light spots, the detected light spots are displayed on a display module of the computer processing terminal, a user can visually see the condition of the light spots in the denoised image, and the position of the through hole 501 where the light spots appear can be determined by calibrating the coordinate system established by the shell 500 in the background image.
The utility model discloses have higher touch position detection resolution, highest resolution depends on used fiber diameter size, and highest resolution can be 125 μm, simultaneously the utility model discloses the multiple touch mode of detectable realizes that different touch modes correspond the different operating instruction of output.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (6)
1. Multi-optical fiber touch sensing device based on image processing technology, its characterized in that: the light-emitting device comprises a light source, a light homogenizing sheet, a plurality of light-emitting optical fibers, a shell, a plurality of light-receiving optical fibers, an image acquisition module and a processing module, wherein the shell is provided with a plurality of through holes, the through holes are uniformly distributed on the outer surface of the shell, the number of the light-emitting optical fibers, the number of the light-receiving optical fibers and the number of the through holes are the same, the light-emitting optical fibers, the light-receiving optical fibers and the through holes are arranged in a one-to-one correspondence manner, and the output ends of the light-emitting optical fibers and the input ends of the light;
the light source comprises a light source, a light receiving optical fiber, an image acquisition module, a processing module and a light homogenizing sheet, wherein light beams emitted by the light source enter the light transmitting optical fiber through the input end of the light transmitting optical fiber after passing through the light homogenizing sheet, the image acquisition module acquires emergent light at the output end of the light receiving optical fiber, the image acquisition module is electrically connected with the processing module, and the processing module is used for processing image information acquired by the image acquisition module.
2. The image processing technology-based multi-fiber touch sensor device of claim 1, wherein: the diameter ranges of the fiber cores of the light transmitting optical fiber and the light receiving optical fiber are 8-980 mu m.
3. The image processing technology-based multi-fiber touch sensor device of claim 1, wherein: the cladding diameters of the light transmitting fiber and the light receiving fiber are both 125-1000 mu m.
4. The image processing technology-based multi-fiber touch sensor device of claim 1, wherein: the light source is an infrared light emitting diode.
5. The image processing technology-based multi-fiber touch sensor device of claim 1, wherein: the image acquisition module is an infrared camera.
6. The image processing technology-based multi-fiber touch sensor device of claim 1, wherein: the processing module is a computer processing terminal.
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| CN201921350979.XU CN210324163U (en) | 2019-08-19 | 2019-08-19 | Multi-optical fiber touch sensing device based on image processing technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110502159A (en) * | 2019-08-19 | 2019-11-26 | 汕头大学 | Multi fiber touch sensor device and control method based on image processing techniques |
| CN113155814A (en) * | 2021-02-07 | 2021-07-23 | 之江实验室 | Portable colorimetric array image acquisition device based on optical fiber array and detection method |
-
2019
- 2019-08-19 CN CN201921350979.XU patent/CN210324163U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110502159A (en) * | 2019-08-19 | 2019-11-26 | 汕头大学 | Multi fiber touch sensor device and control method based on image processing techniques |
| CN110502159B (en) * | 2019-08-19 | 2024-04-30 | 汕头大学 | Multi-optical-fiber touch type sensing device based on image processing technology and control method |
| CN113155814A (en) * | 2021-02-07 | 2021-07-23 | 之江实验室 | Portable colorimetric array image acquisition device based on optical fiber array and detection method |
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