WO2018223838A1 - 投影屏幕、图像合成装置、投影系统及相关方法 - Google Patents

投影屏幕、图像合成装置、投影系统及相关方法 Download PDF

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Publication number
WO2018223838A1
WO2018223838A1 PCT/CN2018/087888 CN2018087888W WO2018223838A1 WO 2018223838 A1 WO2018223838 A1 WO 2018223838A1 CN 2018087888 W CN2018087888 W CN 2018087888W WO 2018223838 A1 WO2018223838 A1 WO 2018223838A1
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WIPO (PCT)
Prior art keywords
projection
area
screen
indication point
projection screen
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Application number
PCT/CN2018/087888
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English (en)
French (fr)
Inventor
王永波
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/328,518 priority Critical patent/US11231790B2/en
Publication of WO2018223838A1 publication Critical patent/WO2018223838A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G06F3/0325—Detection arrangements using opto-electronic means using a plurality of light emitters or reflectors or a plurality of detectors forming a reference frame from which to derive the orientation of the object, e.g. by triangulation or on the basis of reference deformation in the picked up image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0386—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry for light pen
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03542—Light pens for emitting or receiving light
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/60—Editing figures and text; Combining figures or text
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2206/00—Systems for exchange of information between different pieces of apparatus, e.g. for exchanging trimming information, for photo finishing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0442—Handling or displaying different aspect ratios, or changing the aspect ratio
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2354/00—Aspects of interface with display user

Definitions

  • the present disclosure relates to the field of image display technologies, and in particular, to a projection screen, an image synthesizing device, a projection system, and related methods.
  • the current solution is generally that the speaker returns to the computer location, and the mouse is used to display the points to be explained, which leads to a decline in the quality of the speech or teaching, and reduces the interaction between the speaker and the listener.
  • the use of the camera for all video recording the system is complex, and reduces real-time and interactivity.
  • Some embodiments of the present disclosure provide a projection screen, including:
  • the photosensitive element being located on the screen, the photosensitive element being used to generate a position sensing signal
  • a signal processing circuit electrically connected to the photosensitive element, wherein the signal processing circuit is configured to determine a relative position coordinate of the indication point in the projection area and output the signal;
  • the projection area is an area on the projection screen that receives illumination from the light projection device
  • the indication point is a projection point of the light indicating device on the projection screen.
  • the signal processing circuit includes: a projection area identification circuit
  • the projection area identifying circuit is configured to identify an area where the photosensitive element that receives the position sensing signal by receiving the light projection device is located as the projection area.
  • the projection area identifying circuit includes: a first photographing component and a first image recognition component;
  • the first photographing component is configured to photograph the projection screen to obtain a projected screen image
  • the first image recognition component is configured to identify a location corresponding to the projection area in the projection screen image.
  • the signal processing circuit further includes: an indication point identification circuit;
  • the indication point identification circuit is configured to identify a change in an electrical signal output by the photosensitive element, and identify a position of the photosensitive element whose light intensity value on the projection screen is greater than a preset light intensity value as the indication point The absolute position on the projection screen.
  • the indication point identification circuit includes: a second imaging component and a second image recognition component;
  • the second photographing component is configured to photograph the projection screen to obtain a projected screen image
  • the second image recognition component is configured to identify a position in the projection screen image that the brightness value is greater than a preset brightness value as an absolute position of the indication point on the projection screen.
  • the signal processing circuit further includes: a relative position coordinate calculation circuit
  • the relative position coordinate calculation circuit is configured to calculate a relative position coordinate of the indication point in the projection area according to an absolute position of the indication point and a position of the projection area.
  • the relative position coordinate calculation circuit is specifically configured to calculate the relative position coordinates of the indication point in the projection area by numbering the photosensitive element.
  • the relative position coordinate calculation circuit is specifically configured to determine the relative position coordinates of the indication point in the projection area by calculating a position proportional relationship of the indication point in the projection area.
  • the method further includes: a silica gel layer, the silica gel layer being located between the photosensitive element and the curtain.
  • the method further includes: an insulating light transmissive film located on the same film layer as the silicon dioxide layer, and the insulating light transmissive film is located between the silicon dioxide layers.
  • Some embodiments of the present disclosure provide an image synthesizing apparatus, including:
  • a coordinate acquiring circuit configured to acquire relative position coordinates of the indication point indicated in the presentation screen area in the presentation screen area
  • a coordinate mapping circuit for mapping relative position coordinates of the indication point in the presentation picture area to mark pattern coordinates in a presentation picture projected in the presentation picture area;
  • a synthesis circuit for generating a mark pattern at coordinates mapped within the rendered picture.
  • a method further includes: a mark adjustment circuit for adjusting a shape, a color, and/or a size of the mark pattern as needed.
  • Some embodiments of the present disclosure provide a projection system including the above-described projection screen and image synthesizing device;
  • the signal processing circuit in the projection screen is specifically configured to output the relative position coordinates of the indication point in the projection area to the image synthesizing device;
  • the image synthesizing device includes:
  • a coordinate acquiring circuit configured to acquire relative position coordinates of the indication point indicated in the presentation screen area in the presentation screen area
  • a coordinate mapping circuit for mapping relative position coordinates of the indication point in the presentation picture area to mark pattern coordinates in a presentation picture projected in the presentation picture area;
  • a synthesis circuit for generating a mark pattern at coordinates mapped within the rendered picture.
  • Some embodiments of the present disclosure provide a projection system including the above image synthesizing device and projection screen;
  • the projection screen includes:
  • the photosensitive element being located on the screen, the photosensitive element being used to generate a position sensing signal
  • the signal processing circuit is electrically connected to the photosensitive element, the signal processing circuit is configured to determine a relative position coordinate of the indication point in the projection area and output to the image synthesizing device;
  • the projection area is an area on the projection screen that receives illumination from the light projection device
  • the indication point is a projection point of the light indicating device on the projection screen.
  • Some embodiments of the present disclosure provide a coordinate determining method, including:
  • the relative position coordinates are output.
  • Some embodiments of the present disclosure provide an image synthesizing method, including:
  • a mark pattern is generated at the coordinates mapped in the presentation screen.
  • Some embodiments of the present disclosure provide a method of projection, including:
  • a mark pattern is generated at the coordinates mapped in the presentation screen.
  • FIG. 1 is a schematic structural diagram of a projection screen provided by some embodiments of the present disclosure.
  • FIG. 2 is a schematic diagram of a projection area and a pointing point position provided by some embodiments of the present disclosure
  • FIG. 3 is a schematic structural diagram of a signal processing circuit in a projection screen provided by some embodiments of the present disclosure
  • FIG. 4 is a schematic diagram of a photosensitive matrix provided by some embodiments of the present disclosure.
  • FIG. 5 is a schematic diagram of another photosensitive matrix provided by some embodiments of the present disclosure.
  • FIG. 6 is a schematic diagram of a projection area and a pointing point position provided by some embodiments of the present disclosure
  • FIG. 7 is a schematic structural diagram of an image synthesizing apparatus according to some embodiments of the present disclosure.
  • FIG. 8 is a schematic diagram of a rendered image provided by some embodiments of the present disclosure.
  • FIG. 9 is a schematic diagram of another demonstrated image provided by some embodiments of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a projection system according to some embodiments of the present disclosure.
  • FIG. 11 is a schematic diagram of a coordinate determination method provided by some embodiments of the present disclosure.
  • FIG. 12 is a schematic diagram of a size adjustment of a projection area according to a size of a projection screen according to some embodiments of the present disclosure
  • FIG. 13 is a schematic diagram of an image synthesis method according to some embodiments of the present disclosure.
  • FIG. 14 is a schematic diagram of a method for determining a length to width ratio of a projection screen and a projection area according to some embodiments of the present disclosure.
  • a projection screen provided by an embodiment of the present disclosure, as shown in FIG. 1, includes: a curtain 1, a photosensitive element 2, and a signal processing circuit 3;
  • the photosensitive element 2 is located on the screen 1, and the photosensitive element 2 is used for generating a position sensing signal;
  • the signal processing circuit 3 is electrically connected to the photosensitive element 2 (the electrical connection relationship is not shown in FIG. 1), and the signal processing circuit 3 is configured to determine the relative position coordinates of the indication point in the projection area and output; wherein, as shown in FIG. 2, the projection The area 6 is the area on the projection screen that receives illumination from the light projection device; the indication point 7 is the projection point of the light indicating device on the projection screen.
  • the light indicating device may be a laser pointer, and the light projection device may be a projector.
  • the screen 1 is used to receive illumination of the projection device.
  • the photosensitive element 2 can, for example, be located on the side of the screen 1 that is illuminated by the projection device so that the photosensitive element 2 can accurately convert the change in light intensity into an electrical signal output.
  • the photosensitive element 2 generates a position sensing signal after receiving the illumination of the light emitted by the projection device, and the position at which the position sensing signal is generated is the position where the projection screen is illuminated by the projection device.
  • the photosensitive elements 2 are arranged on the screen 1 in the form of a matrix, and FIG. 1 only exemplarily shows the arrangement of the photosensitive elements 2 arranged in 4 rows and 5 columns. .
  • the photosensitive element 2 may be a photodiode.
  • the projection screen may further include a silicone layer 4 , and the silicone layer 3 may be located between the photosensitive element 2 and the screen 1 to prevent the photosensitive element 2 from being removed. Degumming with curtain 1.
  • the insulating transparent film 5 located on the same film layer as the silicone layer 3 may be further included, and the insulating transparent film 5 is located on the silicone layer. Between 3 The insulating light transmissive film 5 functions as an insulation.
  • the signal processing circuit 3 may include: a projection area identification circuit 301;
  • the projection area recognizing circuit 301 is for recognizing the area where the photosensitive element 2 that receives the position sensing signal by receiving the light projection device is located as the projection area 6. That is, the projection area identifying circuit 301 is for recognizing the position of the projection area 6 on the projection screen.
  • the sensing signal can be generated, and the projection area identifying circuit 301 receives the photosensitive element irradiated by the projection light source.
  • the area where 2 is located is identified as the projection area 8.
  • the photosensitive elements 2 are arranged in a regular matrix, and the projection area identifying circuit 301 can generate a photosensitive matrix according to the situation that the projection screen receives the illumination of the light projection device, as shown in FIG.
  • the photosensitive matrix corresponds to the matrix of the photosensitive element 2, and the elements in the photosensitive matrix corresponding to the position of the photosensitive element 2 received by the light projection device are numerically marked, for example, marked as 1, and the light receiving the light projection device is not received.
  • the elements in the photosensitive matrix corresponding to the position of the element 2 are numerically marked, for example, marked as 0, which may be different from the value of the mark received at the position where the light projection device is irradiated.
  • the size of the projection area 6 is the same as the size of the screen 1, as shown in FIG. 5, similar to the above case, and details are not described herein again.
  • the signal processing circuit 3 may further include: an indication point identification circuit 302;
  • the pointing point identification circuit 302 is for identifying the change in the electrical signal output by the photosensitive element 2, and identifying the position of the photosensitive element 2 on the projection screen whose light intensity value is greater than the preset light intensity value as the absolute position of the indication point 7 on the projection screen. That is, the pointing point identification circuit 302 is for identifying the absolute position of the pointing point 7 on the projection screen.
  • the light indicating device illuminates the screen 1.
  • the photosensitive element 2 can generate a position sensing signal, and the pointing point recognition circuit 302 illuminates the projection screen.
  • the position at which the photosensitive element 2 having a strong value greater than the predetermined light intensity value is recognized as the absolute position of the indication point 7 on the projection screen.
  • the preset light intensity value is a preset light intensity value. When the light intensity value at a certain position on the projection screen is greater than the preset light intensity value, the position is determined as the absolute position of the indication point 7 on the projection screen. .
  • the indication point identification circuit 302 can also scan each row and each column of the matrix of the photosensitive elements 2 of the projection screen, respectively, and detect the photosensitive elements due to the illumination position of the light indicating device.
  • the change in the electrical signal caused by the change in resistance of 2 may be a change in current or voltage to determine the absolute position of the indicator point 7 on the projection screen.
  • the pointing point identification circuit 302 acquires the light sensing matrix and converts the numerical value of the element in the light sensing matrix corresponding to the position of the pointing point 7, for example, may become 2.
  • the data of the image scan line is 8 bits, and the data of the address is 0000, 0000.
  • the address data becomes 0000, 0000 plus The data value set by the laser pointer.
  • the indication point identification circuit 302 can recognize the point change of the photosensitive element 2, for example, it can be current or voltage.
  • the position of the geometric center of the at least two photosensitive elements 2 on the projection screen whose light intensity value is greater than the maximum light intensity value in the projection area 6 is recognized as the position of the indication point 7.
  • the signal processing circuit 3 may further include: a relative position coordinate calculation circuit 303;
  • the relative position coordinate calculation circuit 303 is configured to calculate the relative position coordinates of the indication point 7 within the projection area 6 based on the absolute position of the indication point 7 and the position of the projection area 6.
  • the relative position coordinate calculation circuit 303 is for determining the relative position coordinates of the indication point 7 in the projection area 6.
  • the relative position coordinate calculation circuit 303 may be specifically configured to calculate the relative position coordinates of the indication point 7 in the projection area 6 by numbering the photosensitive element 2.
  • the photosensitive elements 2 of the projection area 6 are arranged in a regular rectangular shape, and the relative position coordinate calculation circuit 303 numbers the photosensitive elements 2 included in the projection area 6, and determines the number and relative position of the photosensitive elements 2 indicating the position of the point 7.
  • the coordinate calculation circuit 303 calculates the number of photosensitive elements 2 included between the photosensitive element 2 indicating the position of the point 7 and the first row of photosensitive elements 2 in the same row in the projection area 6 (including the position of the indication point 7 and the projection area 6)
  • the photosensitive element 2) of the first row of the same row occupies the proportion of the total number of photosensitive elements 2 in the projection area 6, and it is also necessary to calculate the photosensitive light of the position of the pointing point 7 to the first row of the same row in the projection area 6.
  • the number of photosensitive elements 2 included between the elements 2 (including the position of the pointing point 7 and the photosensitive element 2 of the first row of the same row in the projection area 6) occupies the total number of photosensitive elements 2 in the same row in the projection area 6.
  • the absolute position coordinates of the indication point 7 in the projection area 6 are then determined.
  • the photosensitive elements 2 are arranged on the projection screen in the form of 4 rows and 5 columns, and the projection area 6 recognized by the projection area identifying circuit 301 is the first, second, and third rows, the first and second rows.
  • the area where the photosensitive element 2 of the 3rd and 4th columns is located, the position of the indication point 7 recognized by the indication point identification circuit 302 is the position where the photosensitive element 2 of the 2nd row and the 2nd column is located, and then the photosensitive element 2 indicating the position of the point 7 is located.
  • the number of photosensitive elements 2 included in the first row of photosensitive elements 2 in the same row in the projection area 6 occupies the projection area 6.
  • the ratio of the total number of photosensitive elements 2 in the same row is 2/5, and the number of photosensitive elements 2 included between the photosensitive element 2 at the position where the point 7 is located to the first row of photosensitive elements 2 in the same column in the projection area 6 (including The position of the pointing point 7 and the photosensitive element 2) of the first row in the same row in the projection area 6 account for 2/4 of the total number of photosensitive elements 2 in the projection area 6, that is, 1/2.
  • the relative position coordinate calculation circuit 303 may also determine the position coordinates of the numerically transformed element in the elements of the photosensitive matrix corresponding to the illumination of the received light projection device, the position corresponding to the position The position where the photosensitive element 2 is located is the relative position coordinate of the indication point 7 in the projection area 6.
  • the relative position coordinate calculation circuit 303 may be specifically configured to determine the indication point 7 in the projection area 6 by calculating the position proportional relationship of the indication point 7 in the projection area 6. Relative position coordinates.
  • the projection area 6 is a regular rectangle
  • the relative position coordinate calculation circuit 303 calculates the distance between the position of the indication point 7 and the left side of the projection area 6 between the left side and the right side of the projection area 6.
  • the ratio of the distance needs to calculate the ratio of the distance between the position of the indication point 7 and the upper side of the projection area 6 to the distance between the upper side and the lower side of the projection area 6, thereby determining that the indication point 7 is Position coordinates within the projection area.
  • the projection area 6 is a regular rectangle, the distance between the indication point 7 and the left side of the projection area 6 is d1, and the distance between the indication point 7 and the upper side of the projection area 6 is d2, and the projection area is The distance between the left side and the right side of 6 is d3, and the distance between the upper side and the lower side of the projected area 6 is d4, so that the position of the pointing point 7 and the left side of the projected area 6 are The distance of the distance between the left side and the right side of the projection area 6 is d1/d3, and the distance between the position where the point 7 is located and the upper side of the projection area 6 occupies the upper side of the projection area 11.
  • the projection area identifying circuit 301 may further include: a first photographing component and a first image recognition component;
  • the first photographing component is configured to photograph the projection screen to obtain the projection screen image 8, as shown in FIG. 6;
  • the first image recognition unit is configured to recognize the position corresponding to the projection area 6 in the projection screen picture 8, that is, the first image recognition unit performs image processing on the obtained projection screen picture 8, and the projection area 6 in the projection screen picture 8 is to be projected. Extract it out.
  • the gradation values of the projection area 6 and the non-projection area are different, and an area having a large gradation value in the projection screen picture 8 is recognized as the projection area 6 by means of edge extraction and image division.
  • the indication point identification circuit 302 may include: a second imaging component and a second image recognition component;
  • the second photographing component is configured to photograph the projection screen to obtain the projection screen image 8, as shown in FIG. 6;
  • the second image recognition unit is configured to recognize the position in the projection screen picture 8 that the brightness value is greater than the preset brightness value as the absolute position of the indication point 7 on the projection screen, that is, the second image recognition unit performs the obtained projection screen picture 8. Image processing, extracting the position of the indication point 7 from the projection screen picture 8.
  • the position of the indication point 7 on the projection screen picture 8 is different from the other position gradation values in the projection screen picture 8, and the position of the indication point 7 should be a position larger than the maximum value of the gradation value in the projection area 6, by edge extraction and By means of image segmentation or the like, an area in which the gradation value of the projection screen picture 8 is larger than the maximum value of the gradation value of the projection area 6 is recognized as the position where the indication point 7 is located.
  • the first imaging component and the second imaging component may be separately provided, or may be implemented by the same imaging component.
  • the recognition result of the photosensitive element 2 and the recognition result of the imaging component and the image recognition component may be integrated such that the relative position of the acquired indication point 7 in the projection area 6 is obtained.
  • the coordinates are more accurate.
  • the projection screen provided in the embodiment of the present disclosure includes a screen 1, a photosensitive element 2, and a signal processing circuit 3, and the position of the projection area 6 is recognized by the projection area identification circuit 301, and the indication point 7 is identified by the indication point identification circuit 302.
  • the absolute position in the projection screen is further determined by the relative position coordinate calculation circuit 303 to determine the relative sitting position of the indication point 7 within the projection area 6. Therefore, the present disclosure is capable of receiving illumination from a projection device, determining relative position coordinates of a projection point of the light indicating device on the projection screen in an area illuminated by the light projection device, that is, position coordinates indicating the point 7 within the projection area 6.
  • an embodiment of the present disclosure further provides an image synthesizing apparatus, as shown in FIG. 7, comprising: a coordinate acquiring circuit 11, a coordinate mapping circuit 12, and a synthesizing circuit 13;
  • the coordinate acquisition circuit 11 is configured to acquire position coordinates of the indication point 7 indicated in the presentation screen area in the presentation screen area;
  • the coordinate mapping circuit 12 is configured to map the position coordinates of the indication point 7 in the presentation picture area to the mark pattern coordinates in the presentation picture projected in the presentation picture area;
  • the synthesizing circuit 13 is operative to generate a mark pattern at the coordinates mapped within the presentation picture.
  • the displayed image may be a static image or a dynamic image, which is not limited herein.
  • the coordinate mapping circuit 12 may be based on the number of photosensitive elements 2 included between the photosensitive element 2 indicating the position of the point 7 and the first row of photosensitive elements 2 in the same row in the projection area 6 (including the position and projection of the indication point 7)
  • the photosensitive element 2) in the first row of the same row in the region 6 occupies the proportion of the total number of photosensitive elements 2 in the projection area 6, and determines the distance from the left side to the left side of the image to be displayed on the left side of the image to be displayed.
  • the position and the photosensitive element 2) of the first row in the same row in the projection area 6 account for the total number of the same column of photosensitive elements 2 in the projection area 6, and the distance to the upper side in the image to be demonstrated is determined to be on the upper side of the image to be demonstrated.
  • the area of the same ratio of the distance from the side to the lower side, the position of the coincidence of the two areas is the position coordinate in the image to be represented obtained after the mapping of the point 7.
  • the distance from the left side to the right side of the presentation image 14 is a1
  • the distance from the upper side to the lower side of the presentation image 14 is a2
  • the photosensitive element indicating the position of the point 7 is 2 to the number of photosensitive elements 2 included in the first row of photosensitive elements 2 in the same row in the projection area 6 (including the position of the pointing point 7 and the photosensitive element 2 of the first row in the same row in the projection area 6) occupying the projection area 6
  • the ratio of the total number of photosensitive elements 2 in the same row is 2/5
  • the area in the presentation image 14 whose distance from the left side of the presentation image 14 is a1*2/5 is L1; if the position of the point 7 is indicated
  • the coordinate mapping circuit 12 determines the image to be presented 14 according to the ratio of the position between the position of the indication point 7 and the left side of the projection area 6 to the distance between the left side and the right side of the projection area 6.
  • the ratio of the distance between the upper side and the lower side of the projection area 6 determines the distance from the side of the presentation image 14 to the side of the presentation image 14 to the distance from the upper side to the lower side of the presentation image 14.
  • the same proportion of the area, the coincidence position of the two areas is the position coordinate in the presentation image 14 obtained after the indication point 7 is mapped.
  • the synthesis circuit generates a marker pattern at the position coordinates in the presentation image.
  • the distance from the left side to the right side of the presentation image 14 is b1
  • the distance from the side to the lower side of the presentation image 14 is b2
  • if the position of the point 7 and the projection area are indicated.
  • the distance between the left side of the projection 6 is proportional to the distance between the left side and the right side of the projection area 6 as d1/d3, and the distance from the left side of the presentation image 14 in the presentation image 14 is b1.
  • the area of *d1/d3 is K1; if the distance between the position of the indication point 7 and the upper side of the projection area 6 is the ratio d2/d4 of the distance between the upper side and the lower side of the projection area 6, Then, the area of the presentation image 14 whose distance from the side of the presentation image 14 is b2*d2/d4 is K2, and the area N where K1 and K2 coincide, that is, the image of the presentation image 14 obtained by mapping the indication point 7 Position coordinates.
  • the synthesizing circuit 13 generates a mark pattern at the position coordinate N in the presentation image 14.
  • the marking pattern may be a special shape such as a solid circle, a triangle, or the like, or a symbol with a special color.
  • the image adjusting device may further include: a mark adjusting circuit configured to adjust a shape, a color, and/or a size of the mark pattern as needed.
  • the image synthesizing apparatus includes a coordinate acquiring circuit 11, a coordinate mapping circuit 12, and a synthesizing circuit 13, and the position of the pointing point 7 indicated in the presentation screen area 14 in the presentation screen area 14 is acquired by the coordinate acquiring circuit 11. Coordinates, the position coordinates of the indication point 7 in the presentation screen area 14 are mapped to the mark pattern coordinates in the presentation screen projected in the presentation screen area 14 by the coordinate mapping circuit 12, and are displayed in the presentation screen by the synthesis circuit 13 A marker pattern is generated at the mapped coordinates. Therefore, the present disclosure is capable of calculating the coordinates within the presented image corresponding to the indication point and generating a marker pattern at the coordinates.
  • an embodiment of the present disclosure further provides a projection system, as shown in FIG. 10, including: the above-mentioned projection screen and image synthesizing device provided by the embodiment of the present invention;
  • the signal processing circuit in the projection screen is specifically configured to output the position coordinates of the indication point 7 in the projection area 6 to the image synthesizing device;
  • the image synthesizing device includes:
  • a coordinate acquisition circuit configured to acquire relative position coordinates of the indication point indicated in the presentation screen area in the presentation screen area
  • a coordinate mapping circuit for mapping relative position coordinates of the indication point in the presentation picture area to mark pattern coordinates within the presented picture projected in the presentation picture area
  • a synthesis circuit for generating a mark pattern at coordinates mapped within the presentation picture.
  • the embodiment of the present disclosure further provides a projection system, as shown in FIG. 10, including: the image synthesizing device and the projection screen provided by the embodiment of the present invention;
  • the projection screen includes:
  • the photosensitive element is located on the screen, and the photosensitive element is used for generating a position sensing signal
  • the signal processing circuit is electrically connected to the photosensitive element, and the signal processing circuit is configured to determine a relative position coordinate of the indication point in the projection area and output the image to the image synthesizing device;
  • the projection area is an area on the projection screen that receives the illumination by the light projection device
  • the pointing point is the projection point of the light indicating device on the projection screen.
  • the projection system determines the relative position coordinates of the indication point 7 in the projection area 6 through the projection screen, and outputs the coordinates to the image synthesizing device, and the image synthesizing device maps the coordinates to the coordinates in the image to be demonstrated. And generating a mark pattern at the coordinates of the mapped image. After the present disclosure generates a mark pattern on the image to be displayed, when performing multi-screen projection, it is possible to indicate a projection screen with the light indicating device, and display the mark pattern on other plurality of projection screens.
  • an embodiment of the present disclosure further provides a coordinate determining method, as shown in FIG. 11 , which may include the following steps:
  • S101 determining, by the projection screen, an area irradiated by the light projection device as a projection area; specifically, identifying an area where the photosensitive element that receives the position sensing signal by receiving the light projection device is located as a projection area; or, may use shooting The component photographs the projection screen to obtain a picture of the projection screen and identifies a position corresponding to the projection area in the picture;
  • S102 Determine a position of a projection point of the light indicating device on the projection screen as an absolute position of the indication point on the projection screen; specifically, a photosensitive element whose projection light intensity value is greater than a maximum value of the light intensity value of the projection area may be The position is identified as an absolute position of the indication point; or, the position in the picture whose brightness value is greater than the maximum brightness value of the projection area is recognized as the absolute position of the indication point;
  • S103 determining a relative position coordinate of the indication point in the projection area; specifically, calculating a relative position coordinate of the indication point in the projection area by the photosensitive element number; or calculating a position proportional relationship determination indication point of the indication point in the projection area Relative position coordinates within the projection area;
  • the method may further include:
  • step S102 It is determined periodically whether or not the laser pen is irradiated to the projection screen, and if so, step S102 is performed.
  • the foregoing step S101 may further include:
  • Adjust the size of the projection area according to the size of the projection screen Specifically, as shown in FIG. 12, the following steps may be included:
  • step S122 determining whether the ratio of the length and width of the projection screen and the projection area are the same; if the same, step S124 is performed; if not, step S123 is performed;
  • an embodiment of the present disclosure further provides an image synthesizing method, as shown in FIG. 13, which may include the following steps:
  • an embodiment of the present disclosure provides a method for projecting, the method comprising:
  • the coordinate determination method determines a relative position coordinate of the indication point in the projection area, and generates a mark pattern according to the coordinate and the image synthesis method provided by the embodiment of the present disclosure at the coordinate mapped in the presentation picture, Displays an image with a marker pattern.
  • the embodiment of the present disclosure provides a method for projecting, which specifically includes the following steps:
  • a mark pattern is generated at the coordinates mapped in the presentation screen.
  • determining the position coordinates of the indication point in the projection area and outputting to the image composition package may be mapped by the coordinate mapping circuit by the proportional relationship of the photosensitive elements, or by indicating the position proportional relationship of the points within the projection area. As shown in FIG. 14, it may further include:
  • step S142 determining whether the ratio of the length and width of the projection screen and the projection area are the same; if the same, step S144 is performed; if not, step S143 is performed;
  • the method for providing the foregoing projection may further include: the image synthesizing device is connected with a plurality of projection screens, and the projected image that generates the projection mark is displayed on the plurality of projection screens.

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Abstract

本公开提供了一种投影屏幕、图像合成装置、投影系统及相关方法。投影屏幕包括幕布，还包括感光元件，感光元件设置于幕布上，用于产生位置感应信号；信号处理电路，信号处理电路用于确定指示点在投影区域的相对位置坐标并输出；其中，投影区域为投影屏幕上接收光投影器件照射的区域；指示点为光指示器件在投影屏幕上的投射点。投影屏幕可以确定指示点在投影区域内的相对位置坐标，通过图像合成装置将该坐标映射为在被演示图像内的坐标，并在投影画面该坐标处生成标记图案，因此可以实现在多个投影屏幕上显示该指示点。

Description

投影屏幕、图像合成装置、投影系统及相关方法
相关申请的交叉引用
本公开要求在2017年06月05日提交中国专利局、申请号为201710414725.9、发明名称为“投影屏幕、图像合成装置和投影系统”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及图像显示技术领域，尤其涉及一种投影屏幕、图像合成装置、投影系统及相关方法。
背景技术
目前在大型演讲或在多课堂同步教学活动中，一般需要多个演示屏幕同时进行操作。当演讲者在就近演讲的屏幕上使用光指示器件(如激光笔)进行位置指示说明时，会出现在其他屏幕上不能看到演讲者指示说明要点的位置，从而导致演讲或教学效果互动性差的问题。
针对这个问题，目前解决的方案一般是演讲者回到计算机位置处，通过操作鼠标来展示要说明的要点，这样就导致了演讲或教学质量下降，降低了演讲者和听众之间的互动性。另外，使用摄像头进行全部视频录制，系统实现复杂，并降低了实时性和交互性。
发明内容
本公开一些实施例提供了一种投影屏幕，包括：
幕布；
感光元件，所述感光元件位于所述幕布上，所述感光元件用于产生位置感应信号；
信号处理电路，所述信号处理电路与所述感光元件电连接，所述信号处 理电路用于确定指示点在投影区域的相对位置坐标并输出；
其中，所述投影区域为所述投影屏幕上接收光投影器件照射的区域；
所述指示点为光指示器件在所述投影屏幕上的投射点。
可选地，所述信号处理电路包括：投影区域识别电路；
所述投影区域识别电路用于将接收到所述光投影器件照射而产生位置感应信号的所述感光元件所在的区域识别为所述投影区域。
可选地，所述投影区域识别电路包括：第一拍摄部件和第一图像识别部件；
所述第一拍摄部件用于对所述投影屏幕进行拍摄以获取投影屏幕图片；
所述第一图像识别部件用于在所述投影屏幕图片中识别出所述投影区域对应的位置。
可选地，所述信号处理电路还包括：指示点识别电路；
所述指示点识别电路用于识别所述感光元件输出的电信号变化，将所述投影屏幕上光强值大于预设光强值的所述感光元件所在的位置识别为所述指示点在所述投影屏幕上的绝对位置。
可选地，所述指示点识别电路包括：第二拍摄部件和第二图像识别部件；
所述第二拍摄部件用于对所述投影屏幕进行拍摄以获取投影屏幕图片；
所述第二图像识别部件用于将所述投影屏幕图片中亮度值大于预设亮度值的位置识别为所述指示点在所述投影屏幕上的绝对位置。
可选地，所述信号处理电路还包括：相对位置坐标计算电路；
所述相对位置坐标计算电路用于根据所述指示点的绝对位置和所述投影区域的位置计算出所述指示点在所述投影区域内的相对位置坐标。
可选地，所述相对位置坐标计算电路具体用于通过对所述感光元件编号计算所述指示点在所述投影区域内的所述相对位置坐标。
可选地，所述相对位置坐标计算电路具体用于通过计算所述指示点在所述投影区域内的位置比例关系确定所述指示点在所述投影区域内的所述相对位置坐标。
可选地，还包括：硅胶层，所述硅胶层位于所述感光元件与所述幕布之间。
可选地，还包括：与所述硅胶层位于同一膜层的绝缘透光薄膜，且所述绝缘透光薄膜位于所述硅胶层之间。
本公开一些实施例提供了一种图像合成装置，包括：
坐标获取电路，所述坐标获取电路用于获取在演示画面区域中进行指示的指示点在所述演示画面区域内的相对位置坐标；
坐标映射电路，所述坐标映射电路用于将所述指示点在所述演示画面区域内的相对位置坐标映射为在所述演示画面区域中所投射的被演示画面内的标记图案坐标；以及
合成电路，所述合成电路用于在所述被演示画面内映射后的坐标处生成标记图案。
可选地，还包括：标记调整电路，所述标记调整电路用于根据需要调整所述标记图案的形状、颜色和/或大小。
本公开一些实施例提供了一种投影系统，包括上述投影屏幕和图像合成装置；
所述投影屏幕中的信号处理电路具体用于将指示点在投影区域的相对位置坐标输出给所述图像合成装置；
所述图像合成装置包括：
坐标获取电路，所述坐标获取电路用于获取在演示画面区域中进行指示的指示点在所述演示画面区域内的相对位置坐标；
坐标映射电路，所述坐标映射电路用于将所述指示点在所述演示画面区域内的相对位置坐标映射为在所述演示画面区域中所投射的被演示画面内的标记图案坐标；以及
合成电路，所述合成电路用于在所述被演示画面内映射后的坐标处生成标记图案。
本公开一些实施例提供了一种投影系统，包括上述图像合成装置和投影 屏幕；
投影屏幕包括：
幕布；
感光元件，所述感光元件位于所述幕布上，所述感光元件用于产生位置感应信号；
信号处理电路，所述信号处理电路与所述感光元件电连接，所述信号处理电路用于确定指示点在投影区域的相对位置坐标并输出给所述图像合成装置；
其中，所述投影区域为所述投影屏幕上接收光投影器件照射的区域；
所述指示点为光指示器件在所述投影屏幕上的投射点。
本公开一些实施例提供了一种坐标确定方法，包括：
将投影屏幕上接收光投影器件照射的区域确定为投影区域；
将光指示器件在所述投影屏幕上的投射点位置确定为指示点在所述投影屏幕上的绝对位置；
确定所述指示点在所述投影区域的相对位置坐标；
将所述相对位置坐标输出。
本公开一些实施例提供了一种图像合成方法，包括：
获取在演示画面区域中进行指示的指示点在所述演示画面区域内的位置坐标；
将所述指示点在所述演示画面区域内的位置坐标映射为在所述演示画面区域中所投射的被演示画面内的标记图案坐标；
在被演示画面内映射后的坐标处生成标记图案。
本公开一些实施例提供了一种投影的方法，包括：
将投影屏幕上接收光投影器件照射的区域确定为投影区域；
将光指示器件在所述投影屏幕上的投射点位置确定为指示点在所述投影屏幕上的绝对位置；
确定所述指示点在所述投影区域的相对位置坐标；
将所述相对位置坐标输出；
获取在演示画面区域中进行指示的所述指示点在所述演示画面区域内的位置坐标；
将所述指示点在所述演示画面区域内的位置坐标映射为在所述演示画面区域中所投射的被演示画面内的标记图案坐标；
在被演示画面内映射后的坐标处生成标记图案。
附图说明
图1是本公开一些实施例提供的投影屏幕的构成示意图；
图2是本公开一些实施例提供的投影区域和指示点位置的示意图；
图3是本公开一些实施例提供的投影屏幕中信号处理电路的构成示意图；
图4是本公开一些实施例提供的感光矩阵的示意图；
图5是本公开一些实施例提供的另一种感光矩阵的示意图；
图6是本公开一些实施例提供的投影区域和指示点位置的示意图；
图7是本公开一些实施例提供的图像合成装置的构成示意图；
图8是本公开一些实施例提供的被演示图像的示意图；
图9是本公开一些实施例提供的另一种被演示图像的示意图；
图10是本公开一些实施例提供的投影系统的构成示意图；
图11是本公开一些实施例提供的坐标确定方法的示意图；
图12是本公开一些实施例提供的根据投影屏幕的尺寸调整投影区域的尺寸示意图；
图13是本公开一些实施例提供的图像合成方法的示意图；
图14是本公开一些实施例提供的判断投影屏幕和投影区域的长宽比例方法示意图。
具体实施方式
为了使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本 公开作进一步地详细描述，显然，所描述的实施例仅仅是本公开一部份实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本公开保护的范围。
本公开实施例提供的一种投影屏幕，如图1所示，包括：幕布1、感光元件2和信号处理电路3；
感光元件2位于幕布1上，感光元件2用于产生位置感应信号；
信号处理电路3与感光元件2电连接(图1中未示出电连接关系)，信号处理电路3用于确定指示点在投影区域的相对位置坐标并输出；其中，如图2所示，投影区域6为投影屏幕上接收光投影器件照射的区域；指示点7为光指示器件在投影屏幕上的投射点。
可选地，在本公开实施例提供的上述投影屏幕中，光指示器件可以为激光笔，光投影器件可以为投影仪。
具体地，在本公开实施例提供的上述投影屏幕中，幕布1用于接收投影设备的照射。感光元件2例如可以位于幕布1面向被投影设备照射的一侧，以便感光元件2可以准确的将光强变化转换为电信号输出。对于幕布1的尺寸和感光元件2的个数均不做限制。感光元件2接收到投影设备发出的光的照射后产生位置感应信号，而产生位置感应信号的位置即为投影屏幕被投影设备照射的位置。
可选地，在本公开实施例提供的上述投影屏幕中，感光元件2以矩阵的形式排列于幕布1上，图1仅示例性地给出以4行5列方式排列的感光元件2排列方式。
可选地，在本公开实施例提供的上述投影屏幕中，感光元件2可以为光敏二极管。
可选地，在本公开实施例提供的上述投影屏幕中，如图1所示，投影屏幕还可以包括硅胶层4，硅胶层3可以位于感光元件2与幕布1之间，以防止感光元件2与幕布1脱胶。
可选地，在本公开实施例提供的上述投影屏幕中，如图1所示，还可以包括：与硅胶层3位于同一膜层的绝缘透光薄膜5，且绝缘透光薄膜5位于硅胶层3之间。绝缘透光薄膜5起到绝缘的作用。
可选地，在本公开实施例提供的上述投影屏幕中，如图3所示，信号处理电路3可以包括：投影区域识别电路301；
投影区域识别电路301用于将接收到光投影器件照射而产生位置感应信号的感光元件2所在的区域识别为投影区域6。即投影区域识别电路301用于识别投影区域6在投影屏幕上的位置。
具体地，在本公开实施例提供的上述投影屏幕中，幕布1上的感光元件2接收到光投影器件的照射后，能够产生感应信号，投影区域识别电路301将接收到投影光源照射的感光元件2所在的区域识别为投影区域8。
可选地，在本公开实施例提供的上述投影屏幕中，感光元件2排列为规则的矩阵，投影区域识别电路301能够根据投影屏幕接收光投影器件照射的情况生成感光矩阵，如图4所示，感光矩阵与感光元件2矩阵相对应，对接收到光投影器件照射的感光元件2位置所对应的感光矩阵中的元素进行数值标记，例如标记为1，对未接收到光投影器件照射的感光元件2位置所对应的感光矩阵中的元素进行数值标记，例如标记为0，该数值只要与接收到光投影器件照射的位置的标记数值不同即可。
在实际应用中，存在投影区域6的尺寸与幕布1的尺寸相同的情况，如图5所示，与上述情况类似，在此不再赘述。
可选地，在本公开实施例提供的上述投影屏幕中，如图3所示，信号处理电路3还可以包括：指示点识别电路302；
指示点识别电路302用于识别感光元件2输出的电信号变化，将投影屏幕上光强值大于预设光强值的感光元件2所在的位置识别为指示点7在投影屏幕上的绝对位置。即指示点识别电路302用于识别指示点7在投影屏幕上的绝对位置。
具体地，在本公开实施例提供的上述投影屏幕中，光指示器件照射幕布1， 感光元件2接收到光指示器件的照射后，能够产生位置感应信号，指示点识别电路302将投影屏幕上光强值大于预定光强值的感光元件2所在的位置识别为指示点7在投影屏幕上的绝对位置。预设光强值为一预先设定的光强值，当投影屏幕上某一处的光强值大于该预设光强值，则将该位置判定为指示点7在投影屏幕上的绝对位置。
具体地，在本公开实施例提供的上述投影屏幕中，指示点识别电路302也可以分别对投影屏幕的感光元件2矩阵的每一行和每一列进行扫描，检测由于光指示器件照射位置的感光元件2的电阻变化引起的电信号的变化，例如可以为电流或电压的变化，从而确定指示点7在投影屏幕上的绝对位置。
具体地，在本公开实施例提供的上述投影屏幕中，指示点识别电路302获取感光矩阵并将指示点7位置对应的感光矩阵中的元素的数值标记进行变换，例如可以变为2。
例如当某一位置处没有发生激光笔照射时，图像扫描线的数据是8bit，则该地址的数据为0000，0000，当该位置处发生了激光笔照射，该地址数据变为0000，0000加激光笔设定的数据值。
具体地，在本公开实施例提供的上述投影屏幕中，当指示点7覆盖了至少两个感光元件2时，指示点识别电路302能够识别感光元件2的点变化，例如可以为电流或电压的变化，将投影屏幕上光强值大于投影区域6中最大光强值的至少两个感光元件2的几何中心的位置识别为指示点7位置。
可选地，在本公开实施例提供的上述投影屏幕中，如图3所示，信号处理电路3还可以包括：相对位置坐标计算电路303；
相对位置坐标计算电路303用于根据指示点7的绝对位置和投影区域6的位置计算出指示点7在投影区域6内的相对位置坐标。相对位置坐标计算电路303用于确定指示点7在投影区域6中的相对位置坐标。
可选地，在本公开实施例提供的上述投影屏幕中，相对位置坐标计算电路303可以具体用于通过对感光元件2编号计算指示点7在投影区域6内的相对位置坐标。
例如，投影区域6的感光元件2排列为规则的矩形，相对位置坐标计算电路303将投影区域6所包含的感光元件2进行编号，并确定指示点7所在位置的感光元件2的编号，相对位置坐标计算电路303计算出指示点7所在位置的感光元件2到投影区域6内同一行第一列感光元件2之间所包含的感光元件2的个数(包含指示点7位置和投影区域6内同一行第一列的感光元件2)占投影区域6内同一行感光元件2总个数的比例，还需要计算出指示点7所在位置的感光元件2到投影区域6内同一列第一行感光元件2之间所包含的感光元件2的个数(包含指示点7位置和投影区域6内同一列第一行的感光元件2)占投影区域6内同一列感光元件2总个数的比例，进而确定指示点7在投影区域6内的绝对位置坐标。
具体地，如图2所示，感光元件2以4行5列的形式排布在投影屏幕上，投影区域识别电路301识别出的投影区域6为第1、2、3行，第1、2、3、4列的感光元件2所在的区域，指示点识别电路302识别出的指示点7位置为第2行第2列的感光元件2所在的位置，那么指示点7所在位置的感光元件2到投影区域6内同一行第一列感光元件2之间所包含的感光元件2的个数(包含指示点7位置和投影区域6内同一行第一列的感光元件2)占投影区域6内同一行感光元件2总个数的比例为2/5，指示点7所在位置的感光元件2到投影区域6内同一列第一行感光元件2之间所包含的感光元件2的个数(包含指示点7位置和投影区域6内同一列第一行的感光元件2)占投影区域6内同一列感光元件2总个数的比例为2/4，即1/2。
可选地，在本公开实施例提供的上述投影屏幕中，相对位置坐标计算电路303也可以在感光矩阵对应接收光投影器件照射的元素中确定经过数值变换的元素的位置坐标，该位置对应的感光元件2所在的位置即为指示点7在投影区域6内的相对位置坐标。
可选地，在本公开实施例提供的上述投影屏幕中，相对位置坐标计算电路303可以具体用于通过计算指示点7在投影区域6内的位置比例关系确定指示点7在投影区域6内的相对位置坐标。
例如，投影区域6为一规则矩形，相对位置坐标计算电路303计算出指示点7所在位置与投影区域6的左侧边之间的距离占投影区域6的左侧边与右侧边之间的距离的比例，还需要计算出指示点7所在位置与投影区域6的上侧边之间的距离占投影区域6的上侧边与下侧边之间的距离的比例，从而确定指示点7在投影区域内的位置坐标。
具体地，如图6所示，投影区域6为以规则的矩形，指示点7与投影区域6左侧边的距离为d1，指示点7与投影区域6上侧边的距离为d2，投影区域6的左侧边与右侧边之间的距离为d3，投影区域6的上侧边与下侧边之间的距离为d4，那么指示点7所在位置与投影区域6的左侧边之间的距离占投影区域6的左侧边与右侧边之间的距离的比例为d1/d3，指示点7所在位置与投影区域6的上侧边之间的距离占投影区域11的上侧边与下侧边之间的距离的比例d2/d4。
可选地，在本公开实施例提供的上述投影屏幕中，投影区域识别电路301还可以包括：第一拍摄部件和第一图像识别部件；
第一拍摄部件用于对投影屏幕进行拍摄以获取投影屏幕图片8，如图6所示；
第一图像识别部件用于在投影屏幕图片8中识别出投影区域6对应的位置，即第一图像识别部件对所获得的投影屏幕图片8进行图像处理，将投影屏幕图片8中的投影区域6提取出来。
例如，投影屏幕图片8上投影区域6与非投影区域的灰度值不同，通过边缘提取和图像分割等手段，将投影屏幕图片8中灰度值较大的区域识别为投影区域6。
可选地，在本公开实施例提供的上述投影屏幕中，指示点识别电路302可以包括：第二拍摄部件和第二图像识别部件；
第二拍摄部件用于对投影屏幕进行拍摄以获取投影屏幕图片8，如图6所示；
第二图像识别部件用于将投影屏幕图片8中亮度值大于预设亮度值的位 置识别为指示点7在投影屏幕上的绝对位置，即第二图像识别部件对所获得的投影屏幕图片8进行图像处理，将指示点7位置从投影屏幕图片8中提取出来。
例如，投影屏幕图片8上指示点7的位置与投影屏幕图片8中的其它位置灰度值不同，且指示点7位置应该为大于投影区域6中灰度值最大值的位置，通过边缘提取和图像分割等手段，将投影屏幕图片8中灰度值大于投影区域6灰度值最大值的区域识别为指示点7所在的位置。
其中，第一拍摄部件和第二拍摄部件可以分别设置，也可以由同一个拍摄部件实现。
在具体实施时，在本公开实施例提供的上述投影屏幕中，可以综合感光元件2的识别结果和拍摄部件、图像识别部件的识别结果，以使得获取的指示点7在投影区域6的相对位置坐标更为准确。另外当感光元件6出现故障时，也可以单独采用通过拍摄部件和图像识别部件获取指示点7在投影区域6的相对位置坐标的方案。
综上，本公开实施例中提供的投影屏幕，包括幕布1、感光元件2和信号处理电路3，通过投影区域识别电路301识别投影区域6的位置，通过指示点识别电路302识别指示点7在投影屏幕中的绝对位置，进而通过相对位置坐标计算电路303确定指示点7在投影区域6内的相对坐位置标。故本公开能够接收投影设备照射，确定光指示器件在投影屏幕上的投射点在光投影器件照射的区域中的相对位置坐标，即指示点7在投影区域6内的位置坐标。
基于同一发明构思，本公开实施例还提供了一种图像合成装置，如图7所示，包括：坐标获取电路11、坐标映射电路12和合成电路13；其中，
坐标获取电路11用于获取在演示画面区域中进行指示的指示点7在演示画面区域内的位置坐标；
坐标映射电路12用于将指示点7在演示画面区域内的位置坐标映射为在演示画面区域中所投射的被演示画面内的标记图案坐标；
合成电路13用于在被演示画面内映射后的坐标处生成标记图案。
具体地，被演示图像可以为静态画面，也可以为动态画面，在此不做限定。
具体地，坐标映射电路12可以根据指示点7所在位置的感光元件2到投影区域6内同一行第一列感光元件2之间所包含的感光元件2的个数(包含指示点7位置和投影区域6内同一行第一列的感光元件2)占投影区域6内同一行感光元件2总个数的比例，确定在被演示图像中到左侧边的距离占被演示图像左侧边到右侧边的距离的相同比例的区域，以及根据指示点7所在位置的感光元件2到投影区域6内同一列第一行感光元件2之间所包含的感光元件2的个数(包含指示点7位置和投影区域6内同一列第一行的感光元件2)占投影区域6内同一列感光元件2总个数的比例，确定在被演示图像中到上侧边的距离占被演示图像上侧边到下侧边的距离的相同比例的区域，两个区域的重合的位置即为指示点7映射后得到的在被演示图像中的位置坐标。
具体地，如图8所示，被演示图像14左侧边到右侧边的距离为a1，被演示图像14上侧边到下侧边的距离为a2，若指示点7所在位置的感光元件2到投影区域6内同一行第一列感光元件2之间所包含的感光元件2的个数(包含指示点7位置和投影区域6内同一行第一列的感光元件2)占投影区域6内同一行感光元件2总个数的比例为2/5，则被演示图像14中距离被演示图像14左侧边的距离为a1*2/5的区域为L1；若指示点7所在位置的感光元件2到投影区域6内同一列第一行感光元件2之间所包含的感光元件2的个数(包含指示点7位置和投影区域6内同一列第一行的感光元件2)占投影区域6内同一列感光元件2总个数的比例为1/2，则被演示图像14中距离被演示图像14上侧边的距离为a2*1/2的区域为L2，L1与L2重合的区域M，即为指示点7映射后得到的在被演示图像14中的位置坐标。合成电路13在被演示图像14中的位置坐标M处生成标记图案。
具体地，坐标映射电路12根据指示点7所在位置与投影区域6的左侧边之间的距离占投影区域6的左侧边与右侧边之间的距离的比例，确定在被演示图像14中到被演示图像14左侧边的距离占被演示图像14左侧边到右侧边 的距离的相同比例的区域，以及根据指示点7所在位置与投影区域6的上侧边之间的距离占投影区域6的上侧边与下侧边之间的距离的比例，确定在被演示图像14中到被演示图像14上侧边的距离占被演示图像14上侧边到下侧边的距离的相同比例的区域，两个区域的重合的位置即为指示点7映射后得到的在被演示图像14中的位置坐标。合成电路在被演示图像中的位置坐标处生成标记图案。
具体地，如图9所示，被演示图像14左侧边到右侧边的距离为b1，被演示图像14上侧边到下侧边的距离为b2，若指示点7所在位置与投影区域6的左侧边之间的距离占投影区域6的左侧边与右侧边之间的距离的比例为d1/d3，则被演示图像14中距离被演示图像14左侧边的距离为b1*d1/d3的区域为K1；，若指示点7所在位置与投影区域6的上侧边之间的距离占投影区域6的上侧边与下侧边之间的距离的比例d2/d4，则被演示图像14中距离被演示图像14上侧边的距离为b2*d2/d4的区域为K2，K1与K2重合的区域N，即为指示点7映射后得到的在被演示图像14中的位置坐标。合成电路13在被演示图像14中的位置坐标N处生成标记图案。
可选地，标记图案可以为实心圆形、三角形等特殊形状，也可以为带有特殊颜色的符号。
可选地，在本公开实施例提供的上述图像合成装置中，还可以包括：标记调整电路用于根据需要调整标记图案的形状、颜色和/或大小。
本公开实施例提供的图像合成装置包括坐标获取电路11、坐标映射电路12和合成电路13，通过坐标获取电路11获取在演示画面区域14中进行指示的指示点7在演示画面区域14内的位置坐标，通过坐标映射电路12将指示点7在演示画面区域14内的位置坐标映射为在演示画面区域14中所投射的被演示画面内的标记图案坐标，并通过合成电路13在被演示画面内映射后的坐标处生成标记图案。故本公开能够计算出指示点对应的在被演示图像内的坐标，并在该坐标处生成标记图案。
基于同一发明构思，本公开实施例还提供了一种投影系统，如图10所示， 包括：本发明实施例提供的上述投影屏幕和图像合成装置；其中，
投影屏幕中的信号处理电路具体用于将指示点7在投影区域6的位置坐标并输出给图像合成装置；
图像合成装置包括：
坐标获取电路，坐标获取电路用于获取在演示画面区域中进行指示的指示点在演示画面区域内的相对位置坐标；
坐标映射电路，坐标映射电路用于将指示点在演示画面区域内的相对位置坐标映射为在演示画面区域中所投射的被演示画面内的标记图案坐标；以及
合成电路，合成电路用于在被演示画面内映射后的坐标处生成标记图案。
或者，基于同一发明构思，本公开实施例还提供了一种投影系统，如图10所示，包括：本发明实施例提供的上述图像合成装置和投影屏幕；其中，
投影屏幕包括：
幕布；
感光元件，感光元件位于幕布上，感光元件用于产生位置感应信号；
信号处理电路，信号处理电路与感光元件电连接，信号处理电路用于确定指示点在投影区域的相对位置坐标并输出给图像合成装置；
其中，投影区域为投影屏幕上接收光投影器件照射的区域；
指示点为光指示器件在投影屏幕上的投射点。
本公开实施例提供的投影系统，通过投影屏幕确定指示点7在投影区域6的相对位置坐标，将该坐标输出给图像合成装置，图像合成装置将该坐标映射为在被演示图像内的坐标，并在被演示图像的映射后的坐标处生成标记图案。本公开在被演示图像上生成标记图案后，在进行多屏幕投影时，可以实现用光指示器件指示一个投影屏幕，在其它多个投影屏幕上也可以显示标记图案。
基于同一发明构思，本公开实施例还提供了一种坐标确定方法，如图11所示，可以包括以下步骤：
S101、将投影屏幕上接收光投影器件照射的区域确定为投影区域；具体地，可以将接收到光投影器件照射而产生位置感应信号的感光元件所在的区域识别为投影区域；或者，可以使用拍摄部件对投影屏幕进行拍摄以获取投影屏幕的图片并在该图片中识别出投影区域对应的位置；
S102、将光指示器件在投影屏幕上的投射点位置确定为指示点在投影屏幕上的绝对位置；具体地，可以将投影屏幕上光强值大于投影区域光强值最大值的感光元件所在的位置识别为指示点的绝对位置；或者，将图片中亮度值大于投影区域的最大亮度值的位置识别为指示点的绝对位置；
S103、确定指示点在投影区域的相对位置坐标；具体地，可以通过对感光元件编号计算指示点在投影区域内的相对位置坐标；或者，计算指示点在投影区域内的位置比例关系确定指示点在投影区域内的相对位置坐标；
S104、将该相对位置坐标输出。
可选地，在本公开实施例提供的上述坐标确定方法中，上述步骤S102之前，还可以包括：
定时判断是否有激光笔对投影屏幕进行照射，如果有则执行步骤S102。
可选地，在本公开实施例提供的上述坐标确定方法中，上述步骤S101还可以包括：
根据投影屏幕的尺寸调整投影区域的尺寸。具体地，如图12所示，可以包括以下步骤：
S121、确定投影屏幕和投影区域的长宽比例；
S122、确定投影屏幕和投影区域的长宽比例是否相同；若相同，则执行步骤S124；若不相同，则执行步骤S123；
S123、将投影区域的长宽比例调整为与投影屏幕的长宽比例相同；
S124、保存数据。
基于同一发明构思，本公开实施例还提供了一种图像合成方法，如图13所示，可以包括以下步骤：
S131、获取在演示画面区域中进行指示的指示点在演示画面区域内的位 置坐标；
S132、将指示点在演示画面区域内的位置坐标映射为在演示画面区域中所投射的被演示画面内的标记图案坐标；
S133、在被演示画面内映射后的坐标处生成标记图案。
基于同一发明构思，本公开实施例提供了一种投影的方法，该方法包括：
根据本公开实施例提供的上述坐标确定方法确定指示点在投影区域内的相对位置坐标，根据该坐标以及本公开施例提供的图像合成方法在被演示画面内映射后的坐标处生成标记图案，显示带有标记图案的图像。
具体地，本公开实施例提供了一种投影的方法，该方法具体地包括以下步骤：
将投影屏幕上接收光投影器件照射的区域确定为投影区域；
将光指示器件在投影屏幕上的投射点位置确定为指示点在投影屏幕上的绝对位置；
确定指示点在投影区域的相对位置坐标；
将相对位置坐标输出；
获取在演示画面区域中进行指示的指示点在演示画面区域内的位置坐标；
将指示点在演示画面区域内的位置坐标映射为在演示画面区域中所投射的被演示画面内的标记图案坐标；
在被演示画面内映射后的坐标处生成标记图案。
可选地，确定指示点在投影区域的位置坐标并输出给图像合成装可以为坐标映射电路通过感光元件的数量比例关系实现映射，或者，通过指示点在投影区域内的位置比例关系实现映射。如图14所示，还可以包括：
S141、确定投影屏幕和投影区域的长宽比例；
S142、确定投影屏幕和投影区域的长宽比例是否相同；若相同，则执行步骤S144；若不相同，则执行步骤S143；
S143、将投影区域的长宽比例调整为与投影屏幕的长宽比例相同；
S144、将投影区域的位置坐标输出给图像合成装置。
可选地，本公开实施例提供上述投影的方法还可以包括：图像合成装置连接有多个投影屏幕，将生成投影标记的被投影图像显示在多个投影屏幕上。
通过上述投影方法进行投影，可以实现当用投影笔指示一个投影屏幕时，其它的多个投影屏幕可以同时显示该指示点。
以上仅为本公开的较佳实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (17)

  1. 一种投影屏幕，其中，包括：
    幕布；
    感光元件，所述感光元件位于所述幕布上，所述感光元件用于产生位置感应信号；
    信号处理电路，所述信号处理电路与所述感光元件电连接，所述信号处理电路用于确定指示点在投影区域的相对位置坐标并输出；
    其中，所述投影区域为所述投影屏幕上接收光投影器件照射的区域；
    所述指示点为光指示器件在所述投影屏幕上的投射点。
  2. 根据权利要求1所述的投影屏幕，其中，所述信号处理电路包括：投影区域识别电路；
    所述投影区域识别电路用于将接收到所述光投影器件照射而产生位置感应信号的所述感光元件所在的区域识别为所述投影区域。
  3. 根据权利要求2所述的投影屏幕，其中，所述投影区域识别电路包括：第一拍摄部件和第一图像识别部件；
    所述第一拍摄部件用于对所述投影屏幕进行拍摄以获取投影屏幕图片；
    所述第一图像识别部件用于在所述投影屏幕图片中识别出所述投影区域对应的位置。
  4. 根据权利要求1所述的投影屏幕，其中，所述信号处理电路还包括：指示点识别电路；
    所述指示点识别电路用于识别所述感光元件输出的电信号变化，将所述投影屏幕上光强值大于预设光强值的所述感光元件所在的位置识别为所述指示点在所述投影屏幕上的绝对位置。
  5. 根据权利要求4所述的投影屏幕，其中，所述指示点识别电路包括：第二拍摄部件和第二图像识别部件；
    所述第二拍摄部件用于对所述投影屏幕进行拍摄以获取投影屏幕图片；
    所述第二图像识别部件用于将所述投影屏幕图片中亮度值大于预设亮度值的位置识别为所述指示点在所述投影屏幕上的绝对位置。
  6. 根据权利要求4所述的投影屏幕，其中，所述信号处理电路还包括：相对位置坐标计算电路；
    所述相对位置坐标计算电路用于根据所述指示点的绝对位置和所述投影区域的位置计算出所述指示点在所述投影区域内的相对位置坐标。
  7. 根据权利要求6所述的投影屏幕，其中，所述相对位置坐标计算电路具体用于通过对所述感光元件编号计算所述指示点在所述投影区域内的所述相对位置坐标。
  8. 根据权利要求6所述的投影屏幕，其中，所述相对位置坐标计算电路具体用于通过计算所述指示点在所述投影区域内的位置比例关系确定所述指示点在所述投影区域内的所述相对位置坐标。
  9. 根据权利要求1-8任一项所述的投影屏幕，其中，还包括：硅胶层，所述硅胶层位于所述感光元件与所述幕布之间。
  10. 根据权利要求1-8任一项所述的投影屏幕，其中，还包括：与所述硅胶层位于同一膜层的绝缘透光薄膜，且所述绝缘透光薄膜位于所述硅胶层之间。
  11. 一种图像合成装置，其中，包括：
    坐标获取电路，所述坐标获取电路用于获取在演示画面区域中进行指示的指示点在所述演示画面区域内的相对位置坐标；
    坐标映射电路，所述坐标映射电路用于将所述指示点在所述演示画面区域内的相对位置坐标映射为在所述演示画面区域中所投射的被演示画面内的标记图案坐标；以及
    合成电路，所述合成电路用于在所述被演示画面内映射后的坐标处生成标记图案。
  12. 根据权利要求11所述的图像合成装置，其中，还包括：标记调整电路，所述标记调整电路用于根据需要调整所述标记图案的形状、颜色和/或大 小。
  13. 一种投影系统，其中，包括如权利要求1-10任一项所述的投影屏幕和图像合成装置；
    所述投影屏幕中的信号处理电路具体用于将指示点在投影区域的相对位置坐标输出给所述图像合成装置；
    所述图像合成装置包括：
    坐标获取电路，所述坐标获取电路用于获取在演示画面区域中进行指示的指示点在所述演示画面区域内的相对位置坐标；
    坐标映射电路，所述坐标映射电路用于将所述指示点在所述演示画面区域内的相对位置坐标映射为在所述演示画面区域中所投射的被演示画面内的标记图案坐标；以及
    合成电路，所述合成电路用于在所述被演示画面内映射后的坐标处生成标记图案。
  14. 一种投影系统，其中，包括如权利要求11-12任一项所述的图像合成装置和投影屏幕；
    所述投影屏幕包括：
    幕布；
    感光元件，所述感光元件位于所述幕布上，所述感光元件用于产生位置感应信号；
    信号处理电路，所述信号处理电路与所述感光元件电连接，所述信号处理电路用于确定指示点在投影区域的相对位置坐标并输出给所述图像合成装置；
    其中，所述投影区域为所述投影屏幕上接收光投影器件照射的区域；
    所述指示点为光指示器件在所述投影屏幕上的投射点；
    所述投影屏幕中的信号处理电路具体用于将指示点在投影区域的相对位置坐标输出给所述图像合成装置。
  15. 一种坐标确定方法，其中，包括：
    将投影屏幕上接收光投影器件照射的区域确定为投影区域；
    将光指示器件在所述投影屏幕上的投射点位置确定为指示点在所述投影屏幕上的绝对位置；
    确定所述指示点在所述投影区域的相对位置坐标；
    将所述相对位置坐标输出。
  16. 一种图像合成方法，其中，包括：
    获取在演示画面区域中进行指示的指示点在所述演示画面区域内的位置坐标；
    将所述指示点在所述演示画面区域内的位置坐标映射为在所述演示画面区域中所投射的被演示画面内的标记图案坐标；
    在被演示画面内映射后的坐标处生成标记图案。
  17. 一种投影的方法，其中，包括：
    将投影屏幕上接收光投影器件照射的区域确定为投影区域；
    将光指示器件在所述投影屏幕上的投射点位置确定为指示点在所述投影屏幕上的绝对位置；
    确定所述指示点在所述投影区域的相对位置坐标；
    将所述相对位置坐标输出；
    获取在演示画面区域中进行指示的所述指示点在所述演示画面区域内的位置坐标；
    将所述指示点在所述演示画面区域内的位置坐标映射为在所述演示画面区域中所投射的被演示画面内的标记图案坐标；
    在被演示画面内映射后的坐标处生成标记图案。
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