CN103019477A - Indoor wireless audio-video holographic interaction back projection all-in-one machine and realization method - Google Patents
Indoor wireless audio-video holographic interaction back projection all-in-one machine and realization method Download PDFInfo
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Abstract
The invention discloses an indoor wireless audio-video holographic interaction back projection all-in-one machine, which comprises at least one server all-in-one machine and a front-end screen, wherein the server all-in-one machine comprises a control circuit and a projection circuit, which are installed inside a shell, the front-end screen comprises a base and a projection screen which is fixed on the base, the projection screen comprises a transparent light guide acrylic panel, an imaging projection film covers the back surface of the transparent light guide acrylic panel, and at least two edges of the transparent light guide acrylic panel are respectively provided with a light emitting diode (LED) infrared light band which is identical to the edge in length. Due to the adoption of the indoor wireless audio-video holographic interaction back projection all-in-one machine and the realization method, the distortion correction problem caused by the position error of a collected image and a projected image can be solved; and since a collection module is physically separated from a projection module, the maintenance cost can be greatly reduced, and the service life of the product is prolonged. Different white spots with different sizes can be produced according to different touch force, so that the corresponding voltage sensing data can be supplied for a calculation circuit. The infrared interference of other wavelengths can be effectively avoided, the range of the application environment can be enlarged, and the touch precision can be improved.
Description
Technical field
The present invention relates to a kind of rear-projection all-in-one, be specifically related to a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine and implementation method.
Background technology
In the existing infrared touch projection technology, system construction needs various product mix scheme collocation to install, and method is complicated, needs professional and technical personnel's Installation and Debugging, carrying inconvenience, and cost is expensive, is unfavorable for the product industrialized development.The prior art algorithm is complicated, and calculated amount is larger, and all calculating are finished by central processing unit, and the machine energy consumption is larger.Prior art can't solve projected picture splicing and acquisition process splicing simultaneously, and the problem of accurate contraposition.Prior art can't guarantee the use problem under the interference of indoor infrared line light.
Chinese patent ZL 2010100594878.4 discloses a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine and implementation method, it comprises at least one service end all-in-one and a frontal attachments, the service end all-in-one comprises control circuit and the project circuit that is installed in the housing, frontal attachments comprises that be positioned at projection screen top or bottom or sidepiece and the corresponding pedestal of projection screen size dimension, is provided with at least two infrared light supplies at the pedestal two ends.
Mention in the 5th page in the instructions, project circuit " also comprises liquid crystal drive board and the light source that is attached thereto ", this design will cause the projection section light utilization not high because light is transmitted to the convex lens assembly by liquid crystal panel, should not use in the stronger light environment of light.
Mention in the 5th page in the instructions, infrared light supply need " each throw with the miter angle vergence direction to have two infrared light supplies at least; the plane of an infinite approach projection screen of formation and with the projection screen plane parallel ", this design will cause light source that complexity is set and precision prescribed is higher, be difficult to adjustment, and can't realize producing corresponding pressure-sensitive effect by staff touch pressure difference.
Summary of the invention
The objective of the invention is provides indoor wireless audio frequency and video holographic interactive back projection all-in-one machine and implementation method a kind of simple in structure, easy to use for overcoming above-mentioned the deficiencies in the prior art.
For achieving the above object, the present invention adopts following technical proposals:
A kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine, comprise at least one service end all-in-one and a front end screen, described service end all-in-one comprises control circuit and the project circuit that is installed in the housing, described front end screen comprises pedestal and the projection screen that is fixed on the pedestal, described projection screen comprises transparent light guide acrylic panel, the back side of described transparent light guide acrylic panel is coated with the projection film, and at least two limits of described transparent light guide acrylic panel are provided with the LED infrared lamp light belt that equates with its length of side.
Described transparent light guide acrylic plate thickness is 8 ~ 10mm.
Each LED infrared lamp in the described LED infrared lamp light belt is no more than 2cm apart.
Described control circuit is provided with video input and output interface and ANTENN AUDIO transmitter module; Described service end all-in-one, also cooperates with a corresponding front end screen from equipment from equipment connection by video input and output interface and at least one; Described is the project circuit that is installed in the housing from equipment, also is provided with video input and the output interface that matches with the service end all-in-one and namely inserts type bus module and interface on project circuit.
Described control circuit also comprises mainboard, is electrically connected CPU and GPU on the mainboard and namely inserts type bus module and interface, and video input and output interface and ANTENN AUDIO transmitter module are electrically connected with mainboard.
Described project circuit comprises DMD digital micro-mirror image-forming assembly and the light source that is attached thereto, described DMD digital micro-mirror image-forming assembly the place ahead is provided with convex lens, DMD digital micro-mirror image-forming assembly, convex lens and light source are on same axis, this axis of camera infinite approach also is provided with the infrared fileter identical with LED infrared lamp light belt wavelength coverage, guarantee that the projection scope overlaps with the acquisition range infinite approach, avoid external interference, enlarge usable range.
Be provided with the ANTENN AUDIO receiver module in the described pedestal, it is connected with loudspeaker.
A kind of implementation method of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine:
1) utilizes the LED infrared lamp light belt of front end screen periphery and the particle reflecting attribute in the transparent light guide acrylic panel, make Infrared arbitrarily bounce-back in the transparent light guide acrylic, so that fill full whole transparent light guide acrylic panel; Show various projected pictures at projection film simultaneously, be provided with for click on area at picture;
2) when the operator touches transparent light guide acrylic panel with finger, its inner arbitrarily Infrared of bounce-back run into finger contact to regional the time just form the diffuse reflection of corresponding area, make light reflection arrive the service end all-in-one, this equipment utilization is sent the infrared picture of perception into governor circuit with the camera of infrared fileter;
3) governor circuit is processed the acquisition image, is converted into the white point-like pattern-information in the ater pattern;
4) supposition infrared ray plane overlaps fully with projected picture, because the resolution of two pictures is different, and the mouse coordinates that following formula can be projected picture with the white dot pattern coordinate transformation in the infrared picture:
Wherein, X, Y are the mouse coordinates value in the projected picture, and Wx, Wy represent respectively the location coordinate information of central point in infrared picture of white hot spot; Bx, By represent respectively the wide high value of the infrared picture of black; Ws, Hs represent respectively wide high value, the i.e. screen resolution of projected picture;
Because want so that the fringe region of projected picture can operate, infrared picture certainly will be larger than projected picture; The timing respectively scope of resulting four the white hot spots generations in four angles of striking projected picture is called as calibration range; Be above-mentioned Bx, By is actual to be the wide high value of calibration range in the infrared picture, and Wx, Wy also are the relative coordinate values in the calibration range;
5) motion recognition detection: gather because camera is frame rate with 25fps or 30fps, so also be to send to governor circuit with identical speed according to the resulting click coordinate data of above-mentioned formula;
With motion and the click data of this hickie pattern center position as cursor of mouse, and the picture of responding projected on the projection film of front end screen; When exporting if any sound signal simultaneously, then send sound signal to the ANTENN AUDIO receiver module of front end screen by the wireless audio and video sending module, the ANTENN AUDIO receiver module drives the loudspeaker playback of audio information;
6) when adopting master and slave equipment work, gather picture splicing and use following technology to realize: be connected to main equipment service end from the device service end by namely inserting the type bus with many; From equipment the infrared ray image information that collects is passed to main equipment, main equipment gathers the splicing of picture, and unify to carry out the coordinate figure analysis, and will throw the interface auto Segmentation and final picture is returned to each from equipment, to realize the splicing of projection and collection.
In the described step 3), image adopted conventional discolor, blur, high-contrast edge processing, increase contrast and sharpening processing.
The invention has the beneficial effects as follows:
1. the present invention has been owing to having used the spatial layout feature of acquisition camera and projection lens infinite approach in service end, guaranteed that acquisition range and projection scope are approaching to overlap, and can effectively avoid indoor infrared ray light interference, increased the real-world environment scope.
2. the present invention has realized high speed, high-precision touch projection function by using specific hardware combinations and software algorithm.
3. software algorithm of the present invention is used the OPENCL technology, utilizes the general-purpose computations characteristic of GPU, and computing velocity is fast, and energy consumption is lower.
4. service end hardware building form of the present invention and particular topology can greatly reduce the workload that software calculates, and become more efficient and convenient so that process the process that calculates coordinate figure from picture.
5. be that there was not the operation delay problem fully in the fastest 2-5 millisecond that reaches of operation screen single frames processing speed under the GPU of the CPU of 1.8MHz and GMA4500 cooperated in dominant frequency.
6. the present invention will be so that infrared touch control equipment micro be installed and used simplicity, has guaranteed simultaneously the characteristic that the high-precision characteristic of touch controllable function and big screen information are propagated.
7. different from other patents be, comparison of the present invention be the coordinate data of former frame, rather than image.If the coordinate figure data do not change or countless certificate (namely not having clicking operation), then do not send to system, just this has greatly reduced the calculated amount of system.
8. in the patent of the present invention, the layout type of " camera and projection source wheelbase infinite approach " can solve the distortion correction problem that picture and projection image site error cause that gathers.And because acquisition module and projection module physical separation can greatly reduce maintenance cost, so that life of product prolongs.
9. in the patent of the present invention, because " Infrared is arbitrarily bounce-back in the leaded light acrylic of front end screen ", just Infrared can be produced diffuse reflection when only having finger truly to touch this acrylic plane, not only can realize real sense of touch, and can produce according to the difference of touch-control dynamics different big or small hickies, for counting circuit provides corresponding pressure-sensitive data.
10. in the patent of the present invention, the infrared filter that uses before the camera uses the LED Infrared that can effectively see through front end with " infrared filter of the wavelength coverage of the high penetration of front end screen periphery LED infrared ray light belt respective wavelength ", but avoid the infrared ray of other wavelength to disturb, thereby increase the environment for use scope of setting up, improve the precision of touch-control.
11. in the patent of the present invention, use transparent light guide acrylic panel can realize arc screen or special-shaped screen as the screen material, this is that other screen materials can't replace.
Description of drawings
Fig. 1 is this service end all-in-one machine structure schematic diagram;
Fig. 2 is front end screen construction schematic diagram;
Fig. 3 is for using constitutional diagram;
Fig. 4 is from the device structure schematic diagram;
Fig. 5 is that constitutional diagram is used in the multiple devices splicing;
Fig. 6 is that the inner Infrared of transparent light guide acrylic panel is transmitted schematic diagram;
Fig. 7 is the optical filtering spectrogram of infrared fileter;
Wherein, 1. mainboard is 2. namely inserted type bus module and interface, 3.CPU, 4.GPU, 5. storage medium, 6.DMD digital micro-mirror image-forming assembly, 7. light source, 8. camera, 9. infrared fileter, 10. ANTENN AUDIO transmitter module, 11.LED infrared lamp light belt, 12. the ANTENN AUDIO receiver module, 13. loudspeakers, 14. projection screens, 15. convex lens, 16. video inputs and output interface, 17. transparent light guide acrylic panels.
Embodiment
The present invention will be further elaborated below in conjunction with drawings and Examples, should be noted that following explanation only is in order to explain the present invention, its content not to be limited.
Such as Fig. 1 ~ shown in Figure 3, the present invention includes at least one service end all-in-one and a front end screen, the service end all-in-one comprises control circuit and the project circuit that is installed in the housing, the front end screen comprises pedestal and the projection screen 14 that is fixed on the pedestal, projection screen 14 comprises the transparent light guide acrylic panel 17 of 8mm ~ 10mm, transparent light guide acrylic panel 17 surface coverage have transparent or semitransparent projection film, and at least two limits of transparent light guide acrylic panel 17 are provided with the LED infrared lamp light belt 11 that equates with its length of side.
Control circuit is provided with video input and output interface and ANTENN AUDIO transmitter module 10; The service end all-in-one by video input and output interface 16 with at least one from equipment connection, also cooperate with a corresponding front end screen from equipment; Be the project circuit that is installed in the housing from equipment, on project circuit, also be provided with video input and the output interface 16 that matches with the service end all-in-one and namely insert type bus module and interface 2.Control circuit also comprises mainboard 1, is electrically connected CPU3 and GPU4 on the mainboard 1 and namely inserts type bus module and interface 2, and video input and output interface 16 and ANTENN AUDIO transmitter module 10 are electrically connected with mainboard 1.Project circuit comprises DMD digital micro-mirror image-forming assembly 6 and the light source 7 that is attached thereto, DMD digital micro-mirror image-forming assembly 6 the place aheads are provided with convex lens 15, DMD digital micro-mirror image-forming assembly 6, convex lens 15 and light source 7 are on same axis, this axis of camera 8 infinite approachs, guarantee that the projection scope overlaps with the acquisition range infinite approach, avoid external interference, enlarge usable range, and be provided with the infrared fileter 9 identical with LED infrared lamp light belt 11 wavelength coverages.Fig. 7 is the optical filtering spectrogram of infrared fileter 9, and the Infrared wavelength of LED infrared lamp light belt 11 is 808nm, and the wavelength of the infrared filter 9 of use is thoroughly high between the 800nm-813nm, and the light of other wavelength is blocked fully.So both can avoid 650nm with the interference of interior visible light, and can avoid again the sunlight of the above wavelength of 880nm or the infrared ray in the flashlamp to disturb.Be provided with ANTENN AUDIO receiver module 12 in the pedestal, it is connected with loudspeaker 13.
Fig. 2 is the mode of installing and using of single equipment, be characterized in multiple product is integrated, make user's imaging end both have infrared ray transmitting function, having again ANTENN AUDIO receives and player function, the simultaneously set combination of equipment has guaranteed that the infrared emission end throws with optimised form, strengthens portable and practicality.
The present invention carries out adjustment before dispatching from the factory, so that installing and using of equipment is very simple, the all-in-one rear-projection equipment can land installation, and also suspended is installed, even the layman also can easily install and use.Service end is set up in after the translucent image forming medium, by adjusting distance and focal length, can obtains the picture of corresponding size; The LED infrared lamp light belt 11 of front end screen periphery is connect electricity.When in parallel, a main equipment is linked to each other with namely inserting the type bus from equipment with Duo Tai, gather picture and calculate in main equipment all-in-one inter-process and with software realization splicing.
When Fig. 5 is the use of many all-in-one touch projection equipment parallel connection,, then with respectively get final product from equipment is in parallel as main equipment with a service end all-in-one.Among Fig. 4, described is the project circuit that is installed in the housing from equipment, also is provided with video input and the output interface 16 that matches with the service end all-in-one and namely inserts type bus module and interface 2 on project circuit.
Fig. 6 is that the inner Infrared of transparent light guide acrylic is transmitted schematic diagram, Infrared is injected from the side of transparent light guide acrylic panel 17, because transparent light guide acrylic panel 17 pros and cons are smooth and have a mirror effect, fish in this similar fish jar cannot see extraneous light, the Infrared that the LED infrared lamp light belt 11 of the screen periphery of user's imaging end produces is entering inside from transparent light guide acrylic panel 17 sides, therein arbitrarily bounce-back is so that fill full whole transparent light guide acrylic panel 17.When the operator with finger when touching transparent light guide acrylic panel 17, its inner arbitrarily Infrared of bounce-back run into finger contact to regional the time just form the diffuse reflection of corresponding area, make light reflection arrive the service end all-in-one.Along with the increase of finger touch pressure, finger contact also can increase to the area on transparent light guide acrylic panel 17 surfaces, and the white facula area that returns to camera 8 also increases thereupon, thereby provides more view data for the touch-control Pressure Analysis.Light will directly pass transparent light guide acrylic panel 17 and inject back-end server camera 8.The camera 8 of service end can this infrared picture of perception by the filter apparatus of coupling front end Infrared wavelength.Simultaneously picture is passed to CPU3 and GPU4 and carry out analyzing and processing.Server device is processed into white point-like pattern-information in the ater picture with this picture, and is converted into coordinate figure information, simultaneously the coordinate figure information analysis is become the coordinate information of the discernible multiple spot cursor of mouse of system.
Said structure has overcome the insurmountable hardware of prior art and has set up complexity, and most of complex work are fulfiled ahead of schedule in the all-in-one production run, has strengthened simultaneously usable range and the touch-control precision of touch projection.Because the particular topology of all-in-one has guaranteed that projection image is relative with the camera collection picture fixing, so demarcating with distortion correction, only need before product export, disposable debugging finish in picture, for the user uses the condition of providing convenience.
Implementation method of the present invention:
1) utilizes the LED infrared lamp light belt 11 of front end screen periphery and the particle reflecting attribute in the transparent light guide acrylic panel 17, make Infrared arbitrarily bounce-back in transparent light guide acrylic panel 17, so that fill full whole transparent light guide acrylic panel 17; Show various projected pictures at projection film simultaneously, be provided with for click on area at picture;
2) when the operator touches transparent light guide acrylic panel 17 with finger, its inner arbitrarily Infrared of bounce-back run into finger contact to regional the time just form the diffuse reflection of corresponding area, make light reflection arrive the service end all-in-one, this equipment utilization is sent the infrared picture of perception into governor circuit with the camera 8 of infrared fileter;
3) governor circuit is processed the acquisition image, is converted into the white point-like pattern-information in the ater pattern; Image adopted conventional discolor, blur, high-contrast edge processing, increase contrast and sharpening processing;
4) supposition infrared ray plane overlaps fully with projected picture, because the resolution of two pictures is different, and the mouse coordinates that following formula can be projected picture with the white dot pattern coordinate transformation in the infrared picture:
Wherein, X, Y are the mouse coordinates value in the projected picture, and Wx, Wy represent respectively the location coordinate information of central point in infrared picture of white hot spot; Bx, By represent respectively the wide high value of the infrared picture of black; Ws, Hs represent respectively wide high value, the i.e. screen resolution of projected picture;
Because want so that the fringe region of projected picture can operate, infrared picture certainly will be larger than projected picture; The timing respectively scope of resulting four the white hot spots generations in four angles of striking projected picture is called as calibration range; Be above-mentioned Bx, By is actual to be the wide high value of calibration range in the infrared picture, and Wx, Wy also are the relative coordinate values in the calibration range;
5) motion recognition detection: gather because camera 8 is frame rate with 25fps or 30fps, so also be to send to governor circuit with identical speed according to the resulting click coordinate data of above-mentioned formula;
With motion and the click data of this hickie pattern center position as cursor of mouse, and the picture of responding projected on the projection film of front end screen; When exporting if any sound signal simultaneously, then send sound signal to the ANTENN AUDIO receiver module of front end screen by the wireless audio and video sending module, the ANTENN AUDIO receiver module drives the loudspeaker playback of audio information;
6) when adopting master and slave equipment work, gather picture splicing and use following technology to realize: be connected to main equipment service end from the device service end by namely inserting the type bus with many; From equipment the infrared ray image information that collects is passed to main equipment, main equipment gathers the splicing of picture, and unify to carry out the coordinate figure analysis, and will throw the interface auto Segmentation and final picture is returned to each from equipment, to realize the splicing of projection and collection.
Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (9)
1. indoor wireless audio frequency and video holographic interactive back projection all-in-one machine, comprise at least one service end all-in-one and a front end screen, described service end all-in-one comprises control circuit and the project circuit that is installed in the housing, described front end screen comprises pedestal and the projection screen that is fixed on the pedestal, it is characterized in that, described projection screen comprises transparent light guide acrylic panel, the back side of described transparent light guide acrylic panel is coated with transparent or semitransparent projection film, and at least two limits of described transparent light guide acrylic panel are provided with the LED infrared lamp light belt that equates with its length of side.
2. a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine as claimed in claim 1 is characterized in that, described transparent light guide acrylic plate thickness is 8 ~ 10mm.
3. a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine as claimed in claim 1 is characterized in that, each the LED infrared lamp in the described LED infrared lamp light belt is no more than 2cm apart.
4. a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine as claimed in claim 1 is characterized in that, described control circuit is provided with video input and output interface and ANTENN AUDIO transmitter module; Described service end all-in-one, also cooperates with a corresponding front end screen from equipment from equipment connection by video input and output interface and at least one; Described is the project circuit that is installed in the housing from equipment, also is provided with video input and the output interface that matches with the service end all-in-one and namely inserts type bus module and interface on project circuit.
5. a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine as claimed in claim 1, it is characterized in that, described control circuit also comprises mainboard, be electrically connected CPU and GPU on the mainboard and namely insert type bus module and interface, video input and output interface and ANTENN AUDIO transmitter module are electrically connected with mainboard.
6. a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine as claimed in claim 1, it is characterized in that, described project circuit comprises DMD digital micro-mirror image-forming assembly and the light source that is attached thereto, described DMD digital micro-mirror image-forming assembly the place ahead is provided with convex lens, DMD digital micro-mirror image-forming assembly, convex lens and light source are on same axis, and this axis of camera infinite approach also is provided with the infrared fileter identical with LED infrared lamp light belt wavelength coverage.
7. a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine as claimed in claim 1 is characterized in that, be provided with the ANTENN AUDIO receiver module in the described pedestal, it is connected with loudspeaker.
8. the implementation method of a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine claimed in claim 1 is characterized in that,
1) utilizes the LED infrared lamp light belt of front end screen periphery and the particle reflecting attribute in the transparent light guide acrylic panel, make Infrared arbitrarily bounce-back in the transparent light guide acrylic, so that fill full whole transparent light guide acrylic panel; Show various projected pictures at projection film simultaneously, be provided with for click on area at picture;
2) when the operator touches transparent light guide acrylic panel with finger, its inner arbitrarily Infrared of bounce-back run into finger contact to regional the time just form the diffuse reflection of corresponding area, make light reflection arrive the service end all-in-one, this equipment utilization is sent the infrared picture of perception into governor circuit with the camera of infrared fileter;
3) governor circuit is processed the acquisition image, is converted into the white point-like pattern-information in the ater pattern;
4) supposition infrared ray plane overlaps fully with projected picture, because the resolution of two pictures is different, and the mouse coordinates that following formula can be projected picture with the white dot pattern coordinate transformation in the infrared picture:
Wherein, X, Y are the mouse coordinates value in the projected picture, and Wx, Wy represent respectively the location coordinate information of central point in infrared picture of white hot spot; Bx, By represent respectively the wide high value of the infrared picture of black; Ws, Hs represent respectively wide high value, the i.e. screen resolution of projected picture;
Because want so that the fringe region of projected picture can operate, infrared picture certainly will be larger than projected picture; The timing respectively scope of resulting four the white hot spots generations in four angles of striking projected picture is called as calibration range; Be above-mentioned Bx, By is actual to be the wide high value of calibration range in the infrared picture, and Wx, Wy also are the relative coordinate values in the calibration range;
5) motion recognition detection: gather because camera is frame rate with 25fps or 30fps, so also be to send to governor circuit with identical speed according to the resulting click coordinate data of above-mentioned formula;
With motion and the click data of this hickie pattern center position as cursor of mouse, and the picture of responding projected on the projection film of front end screen; When exporting if any sound signal simultaneously, then send sound signal to the ANTENN AUDIO receiver module of front end screen by the wireless audio and video sending module, the ANTENN AUDIO receiver module drives the loudspeaker playback of audio information;
6) when adopting master and slave equipment work, gather picture splicing and use following technology to realize: be connected to main equipment service end from the device service end by namely inserting the type bus with many; From equipment the infrared ray image information that collects is passed to main equipment, main equipment gathers the splicing of picture, and unify to carry out the coordinate figure analysis, and will throw the interface auto Segmentation and final picture is returned to each from equipment, to realize the splicing of projection and collection.
9. the implementation method of a kind of indoor wireless audio frequency and video holographic interactive back projection all-in-one machine as claimed in claim 8 is characterized in that, in the described step 3), image adopted conventional discolor, blur, high-contrast edge processing, increase contrast and sharpening processing.
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| CN104102380A (en) * | 2013-04-09 | 2014-10-15 | 北京紫霄科技有限公司 | Touch device and method for realizing force recognition |
| CN105738016A (en) * | 2014-12-11 | 2016-07-06 | 上海箩箕技术有限公司 | Finger pressing pressure detection method |
| CN109403239A (en) * | 2018-10-24 | 2019-03-01 | 深圳市联铭发科技有限公司 | Banister with projecting function |
| CN109403239B (en) * | 2018-10-24 | 2021-07-06 | 深圳市联铭发科技有限公司 | Barrier gate with projection function |
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Application publication date: 20130403 |