Projector capable of capturing images and briefing system having the same

Abstract

A briefing system is used to project images onto a projection screen to form a projection picture. The briefing system comprises a pointer, a projector and a computer electrically connected to the projector. The computer outputs an image signal to the projector. The projector projects an image corresponding to the image signal onto the projection screen to form the projection picture. The indicator is used to project an indication point. The projector also captures the image of the projection picture and the indication point and transfers the image to the computer. The computer then calculates a location where the cursor on the computer screen should reach according to the location of the indication point on the projection picture and moves the cursor on the screen to there.

Description

BRIEF DESCRIPTION OF THE DRAWINGS:

The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:

FIG. 1 is a diagram showing the connection relation between a projector, a computer and an image capturing unit in a prior art briefing system;

FIG. 2 is a diagram of a briefing system according to an embodiment of the present invention; and

FIG. 3 is a diagram of a briefing system according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

As shown in FIG. 2, a briefing system according to a preferred embodiment of the present invention comprises a projector 11, a pointer 12 and a computer 13 electrically connected to the projector 11.

The projector 11 can capture images, and comprises a hollow casing (not shown), a projection control unit 111, an image capturing unit 112 fixedly disposed in the casing and capable of electrically connecting the computer 13, and a wireless receiving unit 113 fixedly disposed in the casing and capable of electrically connecting the computer 13. The projection control unit 111 is fixedly disposed in the casing. A projection exit (not shown) is disposed at a predetermined location of the casing, and a projection exit (not shown) is disposed at a proper location of the casing. The projection control unit 111 has a light source (not shown) and a control circuit (not shown) electrically connected to the light source and the computer 13. The location of the light source in the casing approximately corresponds to the projection exit. The control circuit receives an image signal output by the computer 13, and lets the image signal undergo the projection processing of the light source. A projection picture (not shown) is then projected onto a projection screen 2 from the projection exit of the casing. Because this part of technique is not characteristic of the present invention and is well-known for those skilled in this field, it won't be further described below.

The pointer 12 has a first key 121, an indicating module 122 electrically connected to the first key 121, a second key 123, and a wireless emitting module 124 electrically connected to the second key 123. When the briefer presses the first key 121, the indicating module 122 will produce a visible indication point (not shown) on the projection screen 2.

It should be noted that, in this embodiment, the pointer 12 is a laser pointer. But the pointer 12 can also be a pointer emitting a light source in another way such as infrared. Because the location of the indication point (not shown) on the projection screen where the pointer 12 projects can be immediately displayed by the projection control unit 111, the light source emitted by the pointer 12 is not necessarily limited to visible light. If invisible light such as infrared is adopted, the briefing system of the present invention can also achieve the same indicating effect.

The image capturing unit 112 constantly captures an image on the projection screen 2 including the indication point of the pointer 12 and the projection picture, and sends the image to the computer 13. It should be noted that the image capturing unit 112 can be fixedly disposed outside the casing or partially fixedly in the casing and partially fixed outside the casing. Besides, the casing can have a proper open so that the image capturing unit 112 fixedly disposed in the casing can successfully capture images. In short, it is only necessary for the image capturing unit 112 to be able to capture the whole projection picture produced by the projection control unit 111 at the location on the casing where it is fixedly disposed. The image capturing unit 111 can thus successfully capture an image on the projection screen 2 including the projection screen and the indication point.

In the preferred embodiment of the present invention, the image capturing unit 112 has a camera lens (not shown) made of CCD and arranged above the projection exit. The optical axis of the CCD camera lens is parallel to that of the projection exit. The camera lens of the image capturing unit 112 can also be made of complementary metal oxide semiconductor (CMOS) that can sense images.

It should be noted that if the light source emitted by the pointer 12 is invisible light such as infrared, a filtering plate of specific wavelength can be added in front of the image capturing unit 112 so that the sensor of the camera lens can detect light of specific wavelength to capture the image.

The computer 13 receives an image output by the image capturing unit 112 and analyzes the relative locations of the indication point and the projection picture, and calculates the location where the cursor on the computer screen corresponding to the indication point should reach and moves the cursor to there.

In addition to emitting the indication point, the first key 122 can also have other functions.

The second key 123 of the pointer 12 simulates the function of the left key of a mouse. When the briefer is toward the projection screen 2 and presses the second key 123, the wireless emitting module 124 wirelessly emits a selection signal. In the preferred embodiment of the present invention, the selection signal emitted by the wireless emitting module 124 is of the form of infrared. The selection signal emitted by the wireless emitting module 124 can also be of the form of radio frequency (RF).

Because the emitting direction of the selection signal is essentially parallel to the direction the indicating module 122 emits the indication point, the selection signal is received by the wireless receiving unit 113 after reflected by the projection screen 2. The wireless receiving unit 113 then outputs the selection signal to the computer 13, which sets the file or object pointed by the cursor on the computer screen to a selected state.

When the selection signal emitted by the wireless emitting module 124 is of the form of RF, the selection signal will be emitted in a broadcasting way to be received by the wireless receiving unit 113.

Because the image capturing unit 112 is fixedly disposed on the casing and has a fixed relative location relation with the projection exit, the user needs not to adjust the location of the image capturing unit 112 each time he uses the briefing system. The image capturing unit 112 can simultaneously capture the images of the red indication point and the projection picture.

Besides, because the projection control unit 111 and the image capturing unit 112 are integrated together, only a power supply is required. The briefer needs not to bring another power supply.

As shown in FIG. 3, according to another embodiment of the present invention, the projection control unit 111 can also be a rear projector, which projects a screen image of the computer 13 onto the projection screen 2 and captures a laser point (indication point) projected onto the projection screen 2 for further processing.

It should be noted that the projector 11 of the briefing system of the present invention can also be separately manufactured and sold. The projector 11 can have a projection light source of liquid crystal display (LCD), digital light processing (DLP), liquid crystal on silicon (LCOS) or cathode ray tube (CRT), but is not limited to these. The projector can capture the image of an indication point projected by other conventional pointers to move the cursor on a computer screen.

To sum up, the briefing system of the present invention integrates the functions of the conventional projector 81 and the image capturing unit 84 shown in FIG. 1, and gives a fixed location relation to them. The briefer can save the trouble of adjusting the location of the image capturing unit 112 for simultaneously capturing the images of the indication point of the pointer 12 and the projection picture.

Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have been suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.

Claims

1. A projector capable of capturing images, said projector being used to project a screen image of a computer that is electrically connected to said projector onto a projection screen to produce a projection picture, said projector comprising: a hollow casing;a projection control unit fixedly disposed in said casing and used to receive said screen image of said computer and project said screen image onto said projection screen to produce said projection picture; andan image capturing unit fixedly disposed at a location in said casing where it can capture said whole projection picture produced by said projection control unit to capture an image on said projection screen including a region covered by said whole projection picture.

2. The projector capable of capturing images as claimed in claim 1, wherein a projection outlet is disposed on said casing for said projection control unit to project out said projection picture, said image capturing unit has a lens disposed above said projection outlet, and said lens has an optical axis parallel to that of said projection outlet.

3. The projector capable of capturing images as claimed in claim 1, further comprising a wireless receiving unit, wherein said wireless receiving unit can receive a selection signal that is reflected by said projection screen to control said computer, and send said selection signal to said computer.

4. A briefing system used to project an image onto a projection screen to produce a projection picture, said briefing system comprising: a pointer capable of projecting an indication point in a region on said projection screen and covered by said projection picture; anda projector comprising: a hollow casing;a projection control unit fixedly disposed in said casing and used to receive said screen image of said computer and project said screen image onto said projection screen to produce said projection picture; andan image capturing unit fixedly disposed at a location in said casing where it can capture said whole projection picture produced by said projection control unit to capture an image on said projection screen including said projection picture and said indication point.

5. The briefing system as claimed in claim 4, further comprising a computer wherein said screen image received by said projection control unit is output by said computer, and said image captured by said image capturing unit is input to said computer for analysis.

6. The briefing system as claimed in claim 5, wherein said computer calculates a location where the cursor on a computer screen should reach corresponding to said indication point on said projection screen according to relative locations of said indication point and said projection picture in said image received from said image capturing unit, and moves the cursor on the screen to there.

7. The briefing system as claimed in claim 6, wherein said pointer has a first key, a second key, a indicating module electrically connected to said first key, and a wireless emitting module electrically connected to said second key, and said projector has a wireless receiving unit, said indicating module generates said indication point when said first key is pressed, said second key simulates the function of a left key of a mouse, said wireless emitting module emits a selection signal when said second key is pressed, and said wireless receiving unit can receive said selection signal and transmits said received selection signal to said computer to let said computer set an object where said screen cursor is located to a selected state.

8. The briefing system as claimed in claim 4, wherein said pointer uses a laser light source to project an indication point on said projection screen.

9. The briefing system as claimed in claim 4, wherein said pointer uses an infrared light source to project an indication point on said projection screen.