CN103376921A - Laser labeling system and method - Google Patents

Abstract

The invention provides a laser marking system and a laser marking method. The system includes: a projection module, used to project the slideshow played and displayed on the display screen of the electronic device onto a projection screen; an association module, used to respond to the association request sent by the laser pointer, and connect the display screen with the Position correlation between the projection screens; a continuous light point detection module, used to capture images of the projection screen and detect whether there are continuous laser points emitted by the laser pointer on the projection screen; and a track generation module, used When it is detected that there are several continuous laser points on the projection screen, the projection position of the laser point on the projection screen is obtained according to the position of the laser point in the image, and then a track is added to the position corresponding to the document displayed on the display screen, so that Document content projected onto the projection screen has callouts. The laser marking system and method of the present invention can mark the specific content specified by the user on the projection screen.

Description

Laser marking system and marking method

technical field

The invention relates to the field of optoelectronic technology, in particular to a laser marking system and a marking method.

Background technique

Nowadays, multimedia means such as slideshows are playing an increasingly important role in modern society, and their application fields are becoming more and more extensive. For example, when a lecturer conducts academic exchanges in an academic conference, he often plays the presentations to be communicated in the form of multimedia slides in the computer, and uses an external projector of the computer to project the played multimedia slides to a computer. Projected on a screen for attendees to view. In the past, when presenting slides, the speaker often needed to explain while operating the computer, which undoubtedly restricted the speaker's movement.

Nowadays, the appearance of the laser pointer largely solves the inconvenience when the speaker needs to operate the computer while explaining. For example, the speaker can press the corresponding button on the laser pointer to make the laser pointer emit red laser light so as to realize the key reminder at a long distance, and also let the laser pointer control the presentation to perform simple operations such as turning pages up and down. However, the speaker cannot use the laser pointer to mark up the presentation.

Contents of the invention

In view of this, it is necessary to provide a new laser marking system and method that can solve the above problems.

The present invention provides a laser marking system, which is applied to a projector, and the projector is connected with an electronic device, and the electronic device includes a display screen and can display and play selected documents in the form of a slide show on the display screen. The laser marking system includes: a projection module, used to project the slideshow played and displayed on the display screen of the electronic device onto a projection screen; an association module, used to respond to the association request sent by the laser pen, and send the electronic The display screen of the device is associated with the projection screen, so that a one-to-one mapping relationship is established between each display point on the display screen of the electronic device and the projection point on the projection screen; a continuous light point detection A module for capturing images on the projection screen, and detecting whether there are continuous laser points emitted by the laser pointer on the projection screen according to the acquired images; When there are several continuous laser points, the projection position on the projection screen is obtained according to the positions of the laser points in the image, and the distance between each display point on the display screen of the electronic device and the projection point on the projection screen is obtained. The one-to-one mapping relationship adds a track to the position corresponding to the document content displayed on the display screen of the electronic device, so that the document content projected on the projection screen has a mark.

The present invention also provides a laser marking method, running in a laser marking system, the laser marking system is applied to a projector, the projector is connected with an electronic device, and the electronic device includes a display screen and can be displayed on the display screen Displaying and playing selected documents in the form of slides, the laser marking method includes: after the electronic device is connected to the projector, projecting the slides displayed on the display screen of the electronic device onto a projection screen; Responding to the association request sent by the laser pointer, associating the display screen of the electronic device with the projection screen, so that each display point of the display screen of the electronic device and a projection point on the projection screen are established One-to-one mapping relationship; image capture of the projection screen, and detect whether there are continuous laser points emitted by the laser pointer on the projection screen according to the acquired image; when it is detected that there are several continuous laser points on the projection screen , according to the positions of the laser points in the image to obtain their projection positions on the projection screen, and according to the one-to-one mapping relationship between the display points on the display screen of the electronic device and the projection points on the projection screen in Adding a track to the position corresponding to the document content displayed on the display screen of the electronic device; and projecting the document content with the track added to the projection screen, so that the document content projected on the projection screen has a mark.

Compared with the prior art, the laser marking system and method of the present invention can mark on the projection screen the specific content specified by the user on the slide.

Description of drawings

FIG. 1 is a hardware architecture diagram of a laser marking system in a preferred embodiment of the present invention.

Fig. 2 is a flowchart of the laser marking method of the present invention.

Description of main component symbols

electronic device 1 projector 2 laser pointer 3 Laser marking system 10 Projection module 11 Associated modules 12 Continuous light point detection module 13 Trajectory generation module 14 storage module 15

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

FIG. 1 is a hardware architecture diagram of a laser marking system 10 of the present invention. The laser marking system 10 is applied in a projection system composed of a projector 2 and an electronic device 1 . Wherein, the projector 2 is connected with the electronic device 1 to form the projection system. The electronic device 1 can be any electronic product with a display screen that can display and play selected documents in the form of a slide show, such as a computer. After the projector 2 is connected with the electronic device 1, the slide show displayed on the display screen is projected onto a projection screen (not shown) for users to watch. A laser pointer 3 is wirelessly connected with the laser marking system 10, and the laser pointer 3 is also wirelessly connected with the electronic device 1. It can not only indicate the slides projected on the projection screen by emitting laser light, but also can be used by users and electronic devices. The device 1 performs communication to control page turning of slides, etc., and the communication method includes but not limited to infrared communication or wireless radio frequency communication.

In this embodiment, the laser marking system 10 further includes a projection module 11 , a correlation module 12 , a continuous light point detection module 13 and a trajectory generation module 14 . Each module of the laser marking system 10 can all run in the projector 2 or the electronic device 1 , or partially run in the projector 2 and another part run in the electronic device 1 .

The projection module 11 is used for projecting the slide show played and displayed on the display screen of the electronic device 1 onto the projection screen after the electronic device 1 is connected with the projector 2 .

The association module 12 is used to respond to the association request sent by the laser pointer 3 in real time, and associate the display screen of the electronic device 1 with the projection screen so that each display point of the display screen of the electronic device 1 A one-to-one mapping relationship of coordinate points is established with the projection points of the projection screen. In this embodiment, the association module 12 projects a number of boundary points representing the projection range of the display screen of the electronic device 1 (for example, four boundary points of the projection range of the electronic device 1 at four corner positions) to the projection screen and adjust the projection range accordingly after receiving the association request sent by the laser pointer 3, so that the several boundary points coincide with the frame of the projection screen. At this time, the projection range of the display screen of the electronic device 1 and the projection screen The size coincides. Wherein, the laser pointer 3 is provided with a corresponding association button, when the user presses the association button, the laser pointer 3 generates the association request and sends the association request to the laser marking system, triggering the display screen of the electronic device 1 to interact with the The location association is completed between the projection screens.

The continuous light point detection module 13 is used to capture images of the projection screen, and detect whether there are continuous laser points emitted by the laser pointer on the projection screen according to the captured images. In this embodiment, the continuous light point detection module 13 acquires an image including the projection screen through an image acquisition device (such as a camera, not shown) connected to the projector 2, and the continuous light point detection module The captured range of 13 completely overlaps with the projection range of the electronic device 1 on the projection screen, that is, the entire image captured by the continuous light point detection module 13 is all the content projected by the electronic device 1 . The continuous light point detection module 13 detects the laser point on the projection screen by detecting whether the grayscale of each pixel point of multiple frames of images in the acquired image reaches a predetermined value, for example, when a certain pixel point reaches a predetermined white gray When the degree is high, the continuous light point detection module 13 judges that there is a laser point at the pixel point, and then compares whether the position of the laser point in the continuous multi-frame images changes, and if so, then judges that there is a continuous laser point in the projection screen. Wherein, the laser pointer 3 is also provided with a corresponding marking button, when the user presses and holds the marking button and moves the position of the laser pointer at the same time, the laser pointer 3 will continuously emit laser light, and with the movement of the laser pointer position , producing a continuously moving laser dot on the projection screen.

The trajectory generation module 14 is used to obtain the projection of these laser points on the projection screen according to the positions of these laser points in the image when the continuous light point detection module 13 detects that there are several continuous laser points on the projection screen position, and according to the one-to-one mapping relationship between each display point on the display screen of the electronic device 1 and the projection point on the projection screen, a track is added to the position corresponding to the content of the document displayed on the display screen of the electronic device 1 , the projection module 11 projects the content of the document with the track added to the projection screen, so as to display on the projection screen a slide marked with specific content specified by the user. In this embodiment, the trajectory generation module 14 is also used to analyze the geometric characteristics of the generated trajectory, and determine the normalized figure closest to the generated trajectory, and at this time, the projection module 11 optimizes and displays the normalized figure on the on the projection screen. Wherein, the normalized graph is a graph obtained by optimizing and standardizing the generated trajectory, which may be a text, a symbol or a specific graph, such as a person, a house, a tree, and the like. In this case, the laser marking system 10 further includes a storage module 15 for storing a plurality of the normalized graphics.

Fig. 2 is the flowchart of the laser marking method of the present invention, wherein, this method is applied in above-mentioned laser marking system, and this method comprises the following steps:

Step S21: After the electronic device 1 is connected to the projector 2, the projection module 11 projects the slideshow displayed on the display screen of the electronic device 1 onto the projection screen.

Step S22: The association module 12 responds to the association request sent by the laser pen 3, and makes a position association between the display screen of the electronic device 1 and the projection screen, so that each display point of the display screen of the electronic device 1 is connected to the projection screen. A one-to-one mapping relationship is established between the projection points on the projection screen.

Step S23: The continuous light point detection module 13 captures the image of the projection screen.

Step S24: The continuous light point detection module 13 detects whether there are several continuous laser points emitted by the laser pointer on the projection screen according to the captured continuous images, if yes, proceed to step S25, otherwise the process returns to step S23.

Step S25: The trajectory generating module 14 obtains the projection positions of the laser points on the projection screen according to the positions of the laser points in the image, and according to each display point on the display screen of the electronic device 1 and the projection point on the projection screen The one-to-one mapping relationship generates a track at the position corresponding to the content of the document displayed on the display screen of the electronic device 1 .

Step S26: the projection module 11 projects the document content including the generated track to the projection screen, so as to display a slideshow marked with the specific content specified by the user on the projection screen.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Alterations and variations are within the scope of the claimed invention.

Claims (11)

1. A laser marking system, applied to a projector, the projector is connected with an electronic device, the electronic device includes a display screen and can display and play selected documents in the form of a slide show on the display screen, its features That is, the laser marking system includes: A projection module, used to project the slide show played and displayed on the display screen of the electronic device onto a projection screen; An associating module, used to respond to the association request sent by the laser pointer, and associate the display screen of the electronic device with the projection screen so that each display point on the display screen of the electronic device is connected to the projection screen Establish a one-to-one mapping relationship between the projection points on the A continuous light point detection module, used to capture images of the projection screen, and detect whether there are continuous laser points emitted by the laser pointer on the projection screen according to the acquired images; and A trajectory generation module, used to obtain the projection position of the laser points on the projection screen according to the positions of the laser points in the image when detecting that there are several continuous laser points on the projection screen, and according to the display screen of the electronic device The one-to-one mapping relationship between each display point and the projection point on the projection screen adds a track to the position corresponding to the content of the document displayed on the display screen of the electronic device, so that the slides projected on the projection screen The content is marked. 2. The laser marking system according to claim 1, wherein the association module projects a number of boundary points representing the projection range of the display screen of the electronic device onto the projection screen, and responds after receiving an association request The projection range is adjusted so that the boundary points coincide with the frame of the projection screen. At this time, the projection range of the display screen of the electronic device coincides with the size of the projection screen. 3. The laser marking system according to claim 1, wherein the continuous light point detection module acquires an image including the projection screen through an image acquisition device connected to the projector, and then detects the acquired image Whether the grayscale of each pixel in the multi-frame image reaches a predetermined value is used to detect the laser point on the projection screen, and then compare whether the position of the laser point in the continuous multi-frame image changes, and if so, it is judged that there is Continuous laser dots. 4 . The laser marking system according to claim 3 , wherein the range of the continuous light point detection module to capture images through the image capture device completely coincides with the projection range of the electronic device on the projection screen. 5. The laser marking system according to claim 1, wherein the trajectory generating module is also used to analyze the geometric characteristics of the generated trajectory, determine the normalized figure closest to the generated trajectory, and make the projection The module optimizes and displays the normalized graphics on the projection screen. 6. The laser marking system according to claim 5, further comprising a storage module for storing a plurality of said normalized graphics. 7. A laser marking method, running in a laser marking system, the laser marking system is applied to a projector, the projector is connected to an electronic device, the electronic device includes a display screen and can display a slideshow on the display screen The selected document is displayed and played in the form of a sheet, and it is characterized in that the laser marking method includes: After the electronic device is connected to the projector, project the slideshow played and displayed on the display screen of the electronic device onto a projection screen; Respond to the association request sent by the laser pointer in real time, and associate the display screen of the electronic device with the projection screen so that the distance between each display point of the display screen of the electronic device and a projection point on the projection screen is Establish a one-to-one mapping relationship between them; Capture the image of the projection screen, and detect whether there are continuous laser points emitted by the laser pointer on the projection screen according to the acquired image; When it is detected that there are several continuous laser points on the projection screen, the projection positions of the laser points on the projection screen are obtained according to the positions of the laser points in the image, and the display points on the display screen of the electronic device and the projection screen The one-to-one mapping relationship between the projection points on the electronic device adds a track to the position corresponding to the content of the document displayed on the display screen of the electronic device; and Projecting the document content with added tracks to the projection screen, so that the slide content projected on the projection screen has annotations. 8. The laser marking method according to claim 7, characterized in that, the step of "making a positional association between the display screen of the electronic device and the projection screen, so that each display point of the display screen of the electronic device Establishing a one-to-one mapping relationship with the projection points on the projection screen" includes: projecting a number of boundary points representing the projection range of the display screen of the electronic device onto the projection screen; and After receiving an association request, the projection range is correspondingly adjusted so that the boundary points coincide with the frame of the projection screen, and at this time, the projection range of the display screen of the electronic device coincides with the size of the projection screen. 9. The laser marking method according to claim 7, characterized in that, the step "capturing an image of the projection screen, and detecting whether there are continuous laser points emitted by the laser pointer on the projection screen according to the acquired image "include: acquiring an image including the projection screen through an image acquisition device connected to the projector; Detecting the laser point on the projection screen by detecting whether the grayscale of each pixel of the multi-frame image in the acquired image reaches a predetermined value; and It is compared whether the position of the laser point in the continuous multi-frame images changes, and if so, it is determined that there is a continuous laser point in the projection screen. 10 . The laser marking method according to claim 9 , wherein the range of the image captured by the image capture device completely coincides with the projection range of the electronic device on the projection screen. 11 . 11. The laser marking method according to claim 7, characterized in that, before the step "projecting the generated track onto the projection screen" also includes: The geometric characteristics of the generated trajectory are analyzed to determine the normalized graph closest to the generated trajectory.

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