CN103135805A - Projection near-point control and remote control switching system and method - Google Patents

Projection near-point control and remote control switching system and method Download PDF

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Publication number
CN103135805A
CN103135805A CN2013100452112A CN201310045211A CN103135805A CN 103135805 A CN103135805 A CN 103135805A CN 2013100452112 A CN2013100452112 A CN 2013100452112A CN 201310045211 A CN201310045211 A CN 201310045211A CN 103135805 A CN103135805 A CN 103135805A
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point
host computer
mode
distance control
laser pen
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CN103135805B (en
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金劲松
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SHENZHEN RICHEN TECHNOLOGY Co Ltd
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SHENZHEN RICHEN TECHNOLOGY Co Ltd
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Abstract

The invention provides a projection near-point control and remote control switching system and method. The projection near-point control and remote control switching method includes two switching techniques, namely a wireless signal method and a light spot shape method. The wireless signal method is characterized in that a wireless transmitting device is arranged in a laser pen, an upper computer receives wireless signals transmitted by the wireless transmitting device, and the working mode is automatically switched to a remote control mode. The light spot shape method is characterized in that an image obtaining device obtains light-spot image information sent by the laser pen or a point-touch pen, the light-spot image information is transmitted to the upper computer, the upper computer judges whether a light-spot image comes from the laser pen or the point-touch pen, and the corresponding working mode is switched according to the judged result of the upper computer. The projection near-point control and remote control switching system and method achieve automatic near-point control and remote control switching by aid of the two technical methods, and are simple in design, low in cost, convenient to use and capable of being applied to various scenes.

Description

Switched system and the method for a kind of projection near point control and Long-distance Control
Technical field
The present invention relates to the projection imaging field, relate in particular to that a kind of projection near point is controlled and switched system and the method for Long-distance Control.
Background technology
In traditional projector, projection can only be simply as a display device, demonstrate some interactive functions by electronic whiteboard and some with the laser pen of simple functions, for example beat on projection screen as prompting by the luminous point of visible light laser pen, this is very common in the PPT demonstration, realize the page turning of PPT by the mouse page-turning function button on laser pen, by the electronic whiteboard function such as realize painting on screen.This traditional projector only possesses very basic interactive function, and for example number of patent application is: 201120302737.0, and name is called: projection teaching blackboard is exactly a kind of traditional projection interactive device that passes through touch pad and felt pen realization.
And the projection of a new generation has possessed interaction function, realizes near point control and Long-distance Control, and near point is controlled and realized some touch functions by sightless infrared point stylus on projection screen, and Long-distance Control is exactly to realize the function of analog mouse by laser pen.At number of patent application be: 201110117009.7, name is called: in projector's supervisory system and method, realize a kind of near point point touch-control technology processed, obtain coordinate by the shape of calculating photographic images and then interactive operation is clicked and double-clicked in realization by transmitting control signal to projector; At number of patent application: 201110140977.X, name is called: in a kind of interactive control method and device based on laser pen, realize the interactive control technology of a laser pen, taken the laser pen luminous point by camera and obtain the laser spots image, then translated into computer instruction; At number of patent application be: 201120564916.1, name is called: in the laser pen writing device, send wireless signal to signal receiver by laser pen, be identified as by computing machine and write or remote signal.
But in the interaction of a new generation, for example above-mentioned four patents are the operation that realizes near point or Long-distance Control by various technology, near point is controlled and Long-distance Control is two kinds of different interactive modes, near point is controlled and is similar to a projection screen as a touch screen, can realize touch operation by point-touch pen on projection screen, and Long-distance Control is by right and left key button analog mouse operation on laser pen and laser pen, this dual mode can not use simultaneously, needs a kind of technology can realize automatic switchover mode.In existing technology, majority can only be realized a kind of duty of pattern, or realizes near point control, or realizes Long-distance Control, can't freely switch under two kinds of patterns, has limited the interactive application in the projection.
In view of this, prior art haves much room for improvement and improves.
Summary of the invention
In view of the deficiencies in the prior art, the object of the invention is to provide a kind of switched system and the method for projection near point control and Long-distance Control, this system and method is by using wireless signal technology and luminous point image processing techniques, realize the switching near point control and two kinds of patterns of Long-distance Control automatically, increased the interactivity of interaction.
Technical scheme of the present invention is as follows:
The switched system of a kind of projection near point control and Long-distance Control wherein, comprises a projector, a projection screen, a host computer, a radio receiver, a point-touch pen, a laser pen and an image received device;
Described projector is used for image projection is formed visible image on described projection screen;
Described projection near point is controlled and the changing method of Long-distance Control comprises wireless signal method and light spot form method;
When described handoff technique was chosen as the wireless signal method, described radio receiver was used for receiving the wireless signal that sends from the built-in wireless launcher of laser pen, and this wireless signal is sent to the host computer that is attached thereto; Described host computer according to its receive from the information in radio receiver, automatically its mode of operation is switched to that near point is controlled or distance control mode;
When described handoff technique is chosen as the light spot form method, be used for receiving in real time the luminous point image information of sending from laser pen and point-touch pen at described image acquiring device, and with this communication to being attached thereto the host computer that connects; Described host computer switches near point control model or distance control mode with its mode of operation automatically according to analysis result after its luminous point image information that receives is carried out analyzing and processing.
The switched system of described projection near point control and Long-distance Control, wherein, when described laser pen is in opening, described wireless launcher sends wireless signal according to certain frequency, described radio receiver receives described wireless signal, and with this transmission of wireless signals to host computer, host computer switches to distance control mode with its mode of operation after obtaining the information of described wireless signal automatically; When laser pen is in closed condition, host computer switches to the near point control model with mode of operation.
The switched system of described projection near point control and Long-distance Control, wherein, image acquiring device is used for obtaining the luminous point image information that laser pen or point-touch pen send, and this luminous point image information is uploaded to host computer, image processing apparatus in described host computer carries out analyzing and processing to it, the image of judging this luminous point derives from laser pen or point-touch pen, if the result of judgement is for deriving from laser pen automatically its mode of operation is switched to distance control mode, otherwise its operational module is switched to the near point control model.
The switched system of described projection near point control and Long-distance Control, wherein, described laser pen comprises a laser hole drilling illuminator, a wireless launcher and power management module and battery, and laser hole drilling illuminator, wireless launcher and power management module are connected with battery and are connected in the insulator shell.
The switched system of described projection near point control and Long-distance Control, wherein, described point-touch pen comprises an infrared illuminator, an infrared lamp switch and an internal battery, and described infrared lamp switch is used for controlling infrared illuminator, and described infrared illuminator, infrared lamp switch are connected with internal battery and are connected.
Described projection near point is controlled and the switched system of Long-distance Control, and wherein, described image acquiring device is one to be provided with the infrared camera of infrared filter disc.
The changing method of a kind of projection near point control and Long-distance Control, wherein, the method comprises wireless signal method and light spot form method, comprises the following steps when using the wireless signal method:
A1, projector are used for image projection is formed visible image on described projection screen;
B1, the radio receiver that is connected with host computer are used for receiving the wireless signal that sends from the built-in wireless launcher of laser pen, and this signal are sent to host computer;
If C1, described host computer receive from the wireless signal information in described radio receiver, automatically its mode of operation is switched to distance control mode, otherwise its mode of operation is switched to the local control pattern;
D1, when the mode of operation of host computer be that near point is when controlling, projector shows the content that projects on projection screen according to the operational order that point-touch pen sends, and projector shows the content that projects on projection screen according to the operational order that laser pen sends when the mode of operation of host computer is Long-distance Control;
When using the light spot form method, comprise the following steps:
A2, projector are used for image projection is formed visible image on described projection screen;
B2, image acquiring device receive the luminous point image information of sending from laser pen and point-touch pen in real time, and with this communication to being attached thereto the host computer that connects;
C2, described host computer carry out analyzing and processing to the luminous point image information that it receives, and automatically its mode of operation are switched near point control model or distance control mode according to analysis result.
D2, when the mode of operation of host computer be that near point is when controlling, projector shows the content that projects on projection screen according to the operational order that point-touch pen sends, and projector shows the content that projects on projection screen according to the operational order that laser pen sends when the mode of operation of host computer is Long-distance Control.
The changing method of described projection near point control and Long-distance Control, wherein, in above-mentioned steps B1, when laser pen was opened, the wireless launcher in laser pen was with certain frequency wireless signal emission; If laser pen is in closed condition, the wireless launcher in laser pen stops wireless signal emission, and described host computer does not receive from the wireless signal information of sending in radio receiver, automatically its mode of operation is switched to the near point control model.
The changing method of described projection near point control and Long-distance Control, wherein, in above-mentioned steps B2, described luminous point image information is the shape information that laser pen and point-touch pen send luminous point.
Described projection near point is controlled and the changing method of Long-distance Control, and wherein, described image acquiring device is one to be provided with the infrared camera of infrared filter disc.
Beneficial effect: the switched system of a kind of projection near point control of the present invention and Long-distance Control, by using two kinds of different technology to realize that interaction can support two kinds of interactive modes simultaneously: near point is controlled and Long-distance Control, in the interactivity that has increased optical projection system and user, simplicity of design of the present invention, be easy to realize, can be applied to various scenes, for the user provides convenience.
Description of drawings
Fig. 1 is the principle assumption diagram of the switched system of a kind of projection near point control of the present invention and Long-distance Control.
Fig. 2 is the best applications embodiment schematic diagram of the switched system of a kind of projection near point control of the present invention and Long-distance Control.
Fig. 3 a be projection near point of the present invention control and the changing method of Long-distance Control in the method flow diagram of wireless signal method.
Fig. 3 b be projection near point of the present invention control and the changing method of Long-distance Control in the method flow diagram of light spot form method.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Be illustrated in figure 1 as the principle assumption diagram of the switched system of a kind of projection near point control provided by the invention and Long-distance Control, comprise with lower module in this system:
The switched system of a kind of projection near point control and Long-distance Control wherein, comprises projector 200, one projection screen 400, one host computer 100, one radio receiver 500, one point-touch pen 700, one laser pens 600 and image received devices 610;
Described projector 200 is used for image projection is formed visible image on described projection screen 400;
Described projection near point is controlled and the changing method of Long-distance Control comprises two kinds of wireless signal method and light spot form methods in the present invention.
When described handoff technique is chosen as the wireless signal method, receives by radio receiver 500 wireless signal that sends from wireless launcher built-in in laser pen 600 610, and this signal is sent to the host computer 100 that is attached thereto; Described host computer 100 according to its receive from the information in radio receiver 500, automatically its mode of operation is switched to that near point is controlled or distance control mode.
When described handoff technique is chosen as the light spot form method, be used for receiving in real time the luminous point image information of sending from laser pen 600 and point-touch pen 700 at described image acquiring device, and with this communication to being attached thereto the host computer 100 that connects; Described host computer 100 switches near point control model or distance control mode with its mode of operation automatically according to analysis result after its luminous point image information that receives is carried out analyzing and processing.
Concrete, described wireless signal method is when concrete the application, when described laser pen is in opening, described wireless launcher sends wireless signal according to certain frequency, the described wireless signal of reception that described radio receiver is real-time, and with this transmission of wireless signals to host computer, after host computer obtains the information of this wireless signal, default user wants to use laser pen to carry out Long-distance Control to projector at this moment, automatically its mode of operation is switched to distance control mode;
If laser pen is in closed condition, the wireless launcher of section of setting within it stops sending wireless signal, radio receiver can't receive the wireless signal from laser pen inside, host computer does not receive the wireless signal that wireless launcher sends, it switches to the near point control model with mode of operation, i.e. point-touch pen near point control model.
if when selecting the light spot form method to carry out the switching of the control of projection near point and Long-distance Control in said system, image acquiring device is used for obtaining the dot pattern picture that laser pen or point-touch pen send, and the luminous point image information that it obtains is uploaded to host computer, image processing apparatus in described host computer carries out analyzing and processing to it, the image of judging this luminous point by the shape of this luminous point derives from laser pen or point-touch pen, if the result of judgement is for deriving from laser pen automatically its mode of operation is switched to distance control mode, otherwise its operational module is switched to the near point control model.
Preferably, wherein, described laser pen comprises a laser hole drilling illuminator, a wireless launcher and power management module and battery, and laser hole drilling illuminator, wireless launcher and power management module are connected with battery and are connected in the insulator shell.
Wherein, described point-touch pen comprises an infrared illuminator, an infrared lamp switch and an internal battery, and described infrared lamp switch is used for controlling infrared illuminator, and described infrared illuminator, infrared lamp switch are connected with internal battery and are connected.
Fig. 2 is the switched system best applications embodiment schematic diagram of a kind of projection near point control provided by the invention and Long-distance Control.Shown in Figure 2, system of the present invention is in having enforcement, the projection near point is controlled and the switching of Long-distance Control if choice for use wireless signal method is carried out, concrete, at first use projector 30 with information projection to projection screen 40, contain a wireless launcher in described laser pen 60, when this laser pen was in opening, the wireless launcher of the section that sets within it sent wireless signal according to certain frequency.Described radio receiver 50 is used for receiving this wireless signal that comes wireless launcher since then to send, and send this wireless signal information to host computer 10, after host computer 10 obtains this wireless signal, automatically its mode of operation is switched to distance control mode.If this laser pen is in closed condition, the wireless launcher that is arranged on wherein stops wireless signal emission, and host computer 10 does not receive wireless signal information, automatically its mode of operation is switched to the near point control model.30 of projector show according to the mode of operation of host computer 10 content to its projection.
If choice for use light spot form method, use one to be provided with the infrared camera 20 of infrared filter disc as image acquiring device on camera, use this infrared camera 20 to obtain the dot pattern picture that sends from laser pen 60 and point-touch pen 70, and the luminous point image information of its acquisition is sent to the host computer 10 that is attached thereto, contain image processing function in this host computer, luminous point image information to its acquisition is carried out analyzing and processing, judges this dot pattern picture from laser pen or point-touch pen.
In concrete embodiment, by modifying to penetrating the hole by the light to the nib of laser pen 60, the luminous point that makes laser pen 60 get has special shape, such as square, hollow, triangle, perhaps change the size of point-touch pen 70 shaven heads, the luminous point that makes point-touch pen 70 be transmitted on screen is larger than the spot definition of laser pen 60.The infrared filter disc of camera fit on of infrared camera 20, catch the image that contains luminous point, pass to host computer 10, what this host computer 10 judged work at present by the identification size of luminous point or shape is point-touch pen or laser pen, thereby carries out switching working mode.
The switched system of a kind of projection near point control provided by the invention and Long-distance Control, wherein contain two kinds of handoff techniques: wireless signal method and light spot form method, described wireless signal method arranges a wireless launcher by adopting in laser pen, the wireless signal receiver that is connected with host computer receives the wireless signal that sends from this wireless launcher and it is transferred to host computer, and described host computer switches to distance control mode with its mode of operation; Described light spot form rule is obtained the luminous point image information of sending from laser pen or point-touch pen by an image acquiring device, and with this communication to host computer, the host computer judgement draws this dot pattern and looks like to derive from laser pen or point-touch pen, and host computer switches to corresponding mode of operation according to the result of judging.This system is by using above-mentioned two kinds of technical methods to realize that the near point of projection is controlled and the automatic switchover of Long-distance Control, simplicity of design of the present invention, cost is low, can be applied to various scenes, easy to use, and the present invention has realized that interaction can support two kinds of interactive modes simultaneously: near point is controlled and Long-distance Control, has enriched the interactive mode of interaction.
The present invention also provides the changing method of a kind of projection near point control and Long-distance Control, and the method comprises wireless signal method and two kinds of technical methods of light spot form method.
As shown in Fig. 3 a, comprise the following steps when using the wireless signal method:
A1, projector are used for image projection is formed visible image on described projection screen.
On described projection screen, described projector is connected with a host computer projector with image projection, and controlled this host computer that is formed on.
B1, the radio receiver that is connected with host computer are used for receiving the wireless signal that sends from the built-in wireless launcher of laser pen, and this signal are sent to host computer.
When laser pen was in opening, its inner wireless launcher was launched wireless signal according to certain frequency, and radio receiver receives this wireless signal and this signal message is sent to host computer.
If C1, described host computer receive from the wireless signal information in described radio receiver, automatically its mode of operation is switched to distance control mode, otherwise its mode of operation is switched to the local control pattern.
Upper calculating receives this from the wireless signal information of laser pen, judge this laser pen source opening, judge that the user is enabling laser pen as projection tools, this host computer switches to distance control mode with its mode of operation automatically, i.e. the laser pen mode of operation.
If laser pen is in closed condition in above-mentioned steps B1, host computer can not obtain wireless signal, and it judges that the user does not open laser pen, is using point-touch pen to carry out corresponding projection operation, automatically its mode of operation is switched to the near point control model, i.e. the point-touch pen mode of operation.
D1, when the mode of operation of host computer be that near point is when controlling, projector shows the content that projects on projection screen according to the operational order that point-touch pen sends, when the mode of operation of host computer was Long-distance Control, projector showed the content that projects on projection screen according to the operational order that laser pen sends.
As shown in Fig. 3 b, when using the light spot form method, comprise the following methods step:
A2, projector are used for image projection is formed visible image on described projection screen.
B2, image acquiring device receive the luminous point image information of sending from laser pen and point-touch pen in real time, and with this communication to being attached thereto the host computer that connects.
The luminous point image information that the real-time reception of image acquiring device is sent from laser pen and point-touch pen, described luminous point image information is the shape information that laser pen and point-touch pen send luminous point.
Before using this method, at first needing light to the nib of laser pen or point-touch pen nib to penetrate the hole modifies, the luminous point that makes laser pen or point-touch pen send has special shape, perhaps change the size of laser pen or point-touch pen shaven head, the luminous point that makes point-touch pen beat on screen is larger than the spot definition of laser pen, thereby reach the luminous point image information that laser pen and point-touch pen send, very large difference is arranged, thereby be easier to use image processing apparatus that the luminous point image information is identified.
C2, described host computer carry out analyzing and processing to the luminous point image information that it receives, and automatically its mode of operation are switched near point control model or distance control mode according to analysis result.
Host computer carries out analyzing and processing according to the difference of its size or the difference of shape to it to its luminous point image information that receives, judge its luminous point that obtains from laser pen or point-touch pen, if this luminous point is from laser pen automatically its mode of operation is switched to distance control mode, if this luminous point is from point-touch pen automatically its mode of operation is switched to the near point control model.
D2, when the mode of operation of host computer be that near point is when controlling, projector shows the content that projects on projection screen according to the operational order that point-touch pen sends, and projector shows the content that projects on projection screen according to the operational order that laser pen sends when the mode of operation of host computer is Long-distance Control.
The changing method of described projection near point control and Long-distance Control, wherein, in above-mentioned steps B1, when laser pen was opened, the wireless launcher in laser pen was with certain frequency wireless signal emission; If laser pen is in closed condition, the wireless launcher in laser pen stops wireless signal emission, and described host computer does not receive from the wireless signal information of sending in radio receiver, automatically its mode of operation is switched to the near point control model.
Preferably, in concrete embodiment, described image acquiring device is selected the infrared camera that is provided with infrared filter disc on a camera.
A kind of projection near point provided by the invention is controlled and switched system and the method for Long-distance Control are based on computer vision technique, wireless communication technique, realize the switching near point control and two kinds of patterns of Long-distance Control automatically, compared with prior art, the present invention is switching working mode automatically, accurately and fast, method is simple, be easy to realize, not only can be applied to interactive projector equipment, also can use in other similar devices.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection domain of claims of the present invention.

Claims (10)

1. a projection near point is controlled and the switched system of Long-distance Control, it is characterized in that, comprises a projector, a projection screen, a host computer, a radio receiver, a point-touch pen, a laser pen and an image received device;
Described projector is used for image projection is formed visible image on described projection screen;
Described projection near point is controlled and the changing method of Long-distance Control comprises wireless signal method and light spot form method;
When described handoff technique was chosen as the wireless signal method, described radio receiver was used for receiving the wireless signal that sends from the built-in wireless launcher of laser pen, and this wireless signal is sent to the host computer that is attached thereto; Described host computer according to its receive from the information in radio receiver, automatically its mode of operation is switched to that near point is controlled or distance control mode;
When described handoff technique is chosen as the light spot form method, be used for receiving in real time the luminous point image information of sending from laser pen and point-touch pen at described image acquiring device, and with this communication to being attached thereto the host computer that connects; Described host computer switches near point control model or distance control mode with its mode of operation automatically according to analysis result after its luminous point image information that receives is carried out analyzing and processing.
2. the projection near point is controlled and the switched system of Long-distance Control according to claim 1, it is characterized in that, when described laser pen is in opening, described wireless launcher sends wireless signal according to certain frequency, described radio receiver receives described wireless signal, and with this transmission of wireless signals to host computer, host computer switches to distance control mode with its mode of operation after obtaining the information of described wireless signal automatically; When laser pen is in closed condition, host computer switches to the near point control model with mode of operation.
3. the projection near point is controlled and the switched system of Long-distance Control according to claim 1, it is characterized in that, image acquiring device is used for obtaining the luminous point image information that laser pen or point-touch pen send, and this luminous point image information is uploaded to host computer, image processing apparatus in described host computer carries out analyzing and processing to it, the image of judging this luminous point derives from laser pen or point-touch pen, if the result of judgement is for deriving from laser pen automatically its mode of operation is switched to distance control mode, otherwise its operational module is switched to the near point control model.
4. the near point of projection described according to claim 2 or 3 is controlled and the switched system of Long-distance Control, it is characterized in that, described laser pen comprises a laser hole drilling illuminator, a wireless launcher and power management module and battery, and laser hole drilling illuminator, wireless launcher and power management module are connected with battery and are connected in the insulator shell.
5. the projection near point is controlled and the switched system of Long-distance Control according to claim 1, it is characterized in that, described point-touch pen comprises an infrared illuminator, an infrared lamp switch and an internal battery, described infrared lamp switch is used for controlling infrared illuminator, and described infrared illuminator, infrared lamp switch are connected with internal battery and are connected.
6. the projection near point is controlled and the switched system of Long-distance Control according to claim 3, it is characterized in that, described image acquiring device is one to be provided with the infrared camera of infrared filter disc.
7. a projection near point is controlled and the changing method of Long-distance Control, it is characterized in that, the method comprises wireless signal method and light spot form method, comprises the following steps when use wireless signal method:
A1, projector are used for image projection is formed visible image on described projection screen;
B1, the radio receiver that is connected with host computer are used for receiving the wireless signal that sends from the built-in wireless launcher of laser pen, and this signal are sent to host computer;
If C1, described host computer receive from the wireless signal information in described radio receiver, automatically its mode of operation is switched to distance control mode, otherwise its mode of operation is switched to the local control pattern;
D1, when the mode of operation of host computer be that near point is when controlling, projector shows the content that projects on projection screen according to the operational order that point-touch pen sends, and projector shows the content that projects on projection screen according to the operational order that laser pen sends when the mode of operation of host computer is Long-distance Control;
When using the light spot form method, comprise the following steps:
A2, projector are used for image projection is formed visible image on described projection screen;
B2, image acquiring device receive the luminous point image information of sending from laser pen and point-touch pen in real time, and with this communication to being attached thereto the host computer that connects;
C2, described host computer carry out analyzing and processing to the luminous point image information that it receives, and automatically its mode of operation are switched near point control model or distance control mode according to analysis result;
D2, when the mode of operation of host computer be that near point is when controlling, projector shows the content that projects on projection screen according to the operational order that point-touch pen sends, and projector shows the content that projects on projection screen according to the operational order that laser pen sends when the mode of operation of host computer is Long-distance Control.
8. the projection near point is controlled and the changing method of Long-distance Control according to claim 7, it is characterized in that, in above-mentioned steps B1, when laser pen was opened, the wireless launcher in laser pen was with certain frequency wireless signal emission; If laser pen is in closed condition, the wireless launcher in laser pen stops wireless signal emission, and described host computer does not receive from the wireless signal information of sending in radio receiver, automatically its mode of operation is switched to the near point control model.
9. the projection near point is controlled and the changing method of Long-distance Control according to claim 7, it is characterized in that, in above-mentioned steps B2, described luminous point image information is the shape information that laser pen and point-touch pen send luminous point.
10. the projection near point is controlled and the changing method of Long-distance Control according to claim 7, it is characterized in that, described image acquiring device is one to be provided with the infrared camera of infrared filter disc.
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CN103425409B (en) * 2013-07-30 2017-12-15 华为终端(东莞)有限公司 The control method and device of Projection Display
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