CN111866480B - Light-combined reflector invisible prompter projector system and video data processing method - Google Patents
Light-combined reflector invisible prompter projector system and video data processing method Download PDFInfo
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- CN111866480B CN111866480B CN202010913598.9A CN202010913598A CN111866480B CN 111866480 B CN111866480 B CN 111866480B CN 202010913598 A CN202010913598 A CN 202010913598A CN 111866480 B CN111866480 B CN 111866480B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- 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
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
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- 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
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
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- 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
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/488—Data services, e.g. news ticker
- H04N21/4884—Data services, e.g. news ticker for displaying subtitles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/2222—Prompting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/278—Subtitling
Abstract
The invention discloses a light-combined reflecting mirror invisible prompter projector system, which comprises a first converging mirror, a color wheel, a second converging mirror, a digital micromirror and a lens, and also comprises: the device comprises a polarized light source, a light combination reflector, a polarized light source controller, a subtitle data generation module, a video data generation module, a subtitle superposition module, a digital micromirror drive module and polarized glasses; processing the video data through a subtitle superposition module, projecting the processed video data onto a lens by a digital micromirror, and forming a projection area on an imaging plane; the invention has reasonable design and convenient use, can be used as a common projector, can realize the prompter function of a speaker and cannot influence the watching of audiences.
Description
Technical Field
The invention relates to the technical field of projectors, in particular to a light-combining reflector invisible prompter projector system.
Background
The projector is widely applied at present, and is widely used in school lessons, company meetings, vocational training and product release meetings, the projector is used for projecting images such as PPT (Power Point) on a screen, a speaker needs to explain in combination with the projected images, the PPT generally contains less characters, more content is spoken, most content cannot be seen in the PPT, and some content is not suitable for appearing on the PPT, some prompt materials are needed if the content is not mature, and some people hold lecture prompter cards and the like, so that lecture effect can be influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a light-combining reflector invisible prompter projector system which is reasonable in design and convenient to use, can be used as a common projector, can realize the prompter function for a speaker and does not influence audiences.
In order to solve the technical problems, the technical scheme of the invention is as follows: synthesize stealthy suggestion projector system of light reflex mirror, including first convergent mirror, colour wheel, second convergent mirror, digital micromirror, camera lens, still include:
a polarized light source comprising a vertically polarized light source and a horizontally polarized light source;
the light-gathering reflector is arranged on the front side of the first gathering mirror and comprises a substrate, a triangular reflector array is arranged on the substrate, the triangular reflector is of a triangular prism structure, the cross section of the triangular prism structure is an isosceles triangle, two prismatic surfaces corresponding to the waist of the isosceles triangle are used as reflecting surfaces, the bottom surface of the triangular reflector array is attached to the substrate, the two reflecting surfaces of the triangular reflector are a left reflecting surface and a right reflecting surface respectively, and the included angle between the left reflecting surface and the bottom surface and the included angle between the right reflecting surface and the bottom surface are both 30 degrees; the three-edge reflector is vertically arranged, the vertex angle of the vertical polarized light source and the horizontal polarized light source face the first converging mirror, the vertical polarized light source and the horizontal polarized light source are respectively arranged in front of the left side and the right side of the three-edge reflector, the polarized light generated by the polarized light source on the left side is irradiated onto the left reflecting surface and then reflected onto the first converging mirror by the left reflecting surface, the polarized light generated by the polarized light source on the right side is irradiated onto the right reflecting surface and then reflected onto the first converging mirror by the right reflecting surface, and the included angles between the irradiation directions of the left polarized light source and the right polarized light source and the substrate are both 30 degrees; the polarized light source controller is connected with the polarized light source and controls the vertical polarized light source and the horizontal polarized light source to alternately emit light, and the alternate time is synchronous with the frame switching of the color wheel, namely when the color wheel rotates three color areas, the vertical polarized light source is just switched to the horizontal polarized light source, or the horizontal polarized light source is just switched to the vertical polarized light source;
the caption data generating module is used for generating caption data, wherein the caption data comprises caption stroke area pixel data and non-caption stroke area pixel data, the data values of the caption stroke area pixel data and the non-caption stroke area pixel data are different in size, the values of all the caption stroke area pixel data are equal, and the values of all the non-caption stroke area pixel data are equal;
the video data generation module receives a media signal transmitted by an external interface of the projector, generates video data for driving the digital micromirror through conversion processing, and generates subtitle data with the resolution equal to that of the video data generated by the video data generation module, wherein pixels of the subtitle data and the video data have one-to-one correspondence relationship;
the subtitle data generation module and the video data generation module are respectively connected to the subtitle superposition module; the subtitle data generating module inputs the generated subtitle data into the subtitle superposition module, the video data generating module inputs the generated video data into the subtitle superposition module, and the subtitle superposition module processes the video data according to the subtitle data and superposes subtitle information onto the video data;
the digital micromirror driving module is connected between the caption superposition module and the digital micromirror, and is used for receiving the video data output by the caption superposition module and then driving the digital micromirror to display a picture containing the invisible caption information on an imaging plane;
polarization glasses of which polarization directions are maintained vertical or horizontal.
Preferably, the polarized light source is a laser polarized light source.
As a preferable technical scheme, the lens of the polarized glasses is formed by interleaving polarized areas and non-polarized areas, and the area of each polarized area is less than 0.02 square millimeter.
As a preferred technical solution, a video data processing method of a light-combining mirror invisible hint projector system includes the steps of:
step one, inputting the caption data and the video data into the caption superposition module;
step two, the caption superposition module detects the pixel data of the caption data corresponding to the current video frame in sequence, if the caption data is the pixel data of the caption pen stroke area, the corresponding video data at the same position is detected, if the brightness value of the pixel data of the video data is less than 50% of the maximum brightness value which can be expressed by the pixel data of the video data, the video data is processed, and the processing method is as follows: the brightness value of the data corresponding to the current frame is reset to zero, and the brightness value of the data corresponding to the next frame is doubled; if the caption data detected by the caption superposition module is the pixel data of the non-caption pen area, the brightness value of the corresponding video data is kept unchanged;
and step three, taking the next frame as the current frame, and repeating the step two.
As a preferred technical scheme, in the second step, the following components are added: if the brightness value of the pixel data of the video data is greater than 50% of the maximum brightness value, the brightness value of the corresponding data of the current frame is processed in the following manner: the luminance value of the current frame corresponding data is equal to (current luminance value- (maximum luminance value — current luminance value)), and the luminance value of the next frame corresponding data becomes the maximum luminance value.
As a preferred technical scheme, a step is added between the step one and the step two: the caption superposition module compares the data signals of the current frame and the next frame of the video, if the average value of the difference of the brightness values of the corresponding pixels of the two frames is more than 5 percent of the maximum brightness value which can be expressed by the pixels of the video data, the video of the current frame is not processed, the comparison of the next frame and the following frame is carried out, otherwise, the next step is carried out.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: the invention has reasonable design and convenient use, can be used as a common projector, can realize the prompter function of a speaker and does not influence audiences.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a light combining mirror according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a light combining mirror according to an embodiment of the present invention;
FIG. 4 is a perspective view of a light combining mirror according to an embodiment of the present invention;
FIG. 5 is a block diagram of data processing according to an embodiment of the present invention;
FIG. 6 is a data processing diagram according to an embodiment of the present invention;
FIG. 7 is a schematic view of polarizing glasses according to an embodiment of the invention;
FIG. 8 is an enlarged schematic view at I of FIG. 7;
in the figure: 1-a first converging mirror; 2-a color wheel; 3-a second converging lens; 4-digital micromirror; 41-digital micromirror driving module; 5-lens; 61-vertically polarized light source; 62-a horizontally polarized light source; 7-a light-combining mirror; 71-a substrate; 72-three-edged reflector; 73-left reflecting surface; 74-right reflective surface; 8-a polarized light source controller; 9-subtitle data generating module; 10-a video data generation module; 11-a subtitle superposition module; 12-polarized glasses; 13-a polarization region; 14-a non-polarizing region; 15-imaging plane.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
As shown in fig. 1, the light-combining reflector invisible suggestion projector system includes a first converging mirror 1, a color wheel 2, a second converging mirror 3, a digital micromirror 4(DMD), a lens 5, and further includes: the device comprises a polarized light source, a light combination reflector 7, a polarized light source controller 8, a caption data generation module 9, a video data generation module 10, a caption superposition module 11, a digital micro-mirror driving module 41 and polarized glasses 12; the first converging lens 1, the color wheel 2, the second converging lens 3, the digital micromirror 4, and the lens 5 all belong to a part of the existing projector, and the structure and the installation position thereof all belong to the prior art, which is not described herein again.
Referring to fig. 2, the polarized light source includes a vertically polarized light source 61 and a horizontally polarized light source 62, the vertically polarized light source 61 is configured to generate vertically polarized light, the horizontally polarized light source 62 is configured to generate horizontally polarized light, and the vertically polarized light source 61 and the horizontally polarized light source 62 may employ a laser polarized light source or an LED polarized light source, both of which are prior art and will not be described herein again.
Referring to fig. 2 to 4, the light combining reflector 7 is disposed on the front side of the first converging mirror 1, the light combining reflector 7 includes a substrate 71, a triangular reflector array is disposed on the substrate 71, that is, a plurality of triangular reflectors 72 are disposed on the substrate 71 and arranged in an array, in this embodiment, the substrate 71 and the triangular reflectors 72 are in an integrally formed structure, the triangular reflectors 72 are in a triangular prism structure, the cross section of the triangular prism structure is an isosceles triangle, two prism surfaces corresponding to the waist of the isosceles triangle are used as light reflecting surfaces, the bottom surface is attached to the substrate, the two light reflecting surfaces of the triangular reflectors are a left reflecting surface 73 and a right reflecting surface 74 respectively, an included angle between the left reflecting surface 73 and the right reflecting surface 74 and the bottom surface is 30 °, and an included angle between the left reflecting surface 73 and the right reflecting surface 74 is 120 °; the triangular reflector 72 is vertically arranged, and the vertex angle of the triangular reflector faces the first converging lens 1; the vertical polarized light source 61 and the horizontal polarized light source 62 are respectively arranged in front of the left and right sides of the triangular reflector 72, polarized light generated by the polarized light source on the left side is reflected to the first collecting mirror 1 by the left reflecting surface 73 after being irradiated onto the left reflecting surface 73, and polarized light generated by the polarized light source on the right side is reflected to the first collecting mirror 1 by the right reflecting surface 74 after being irradiated onto the right reflecting surface 74; in this embodiment, the vertical polarized light source 61 is disposed in front of the left side of the triangular reflector 72, and the horizontal polarized light source 62 is disposed in front of the right side of the triangular reflector 72; the included angle between the vertically polarized light generated by the vertically polarized light source 61 and the substrate 71 is 30 °, that is, the vertically polarized light is parallel to the right reflecting surface 74, so that the vertically polarized light can be directly irradiated onto the left reflecting surface 73, and the included angle between the horizontally polarized light generated by the horizontally polarized light source 62 and the substrate 71 is 30 °, that is, the horizontally polarized light is parallel to the left reflecting surface 73, so that the horizontally polarized light can be directly irradiated onto the right reflecting surface 74; by left side plane of reflection 73 with contained angle between right side plane of reflection 74 and the bottom surface is 30, consequently, shine to with 30 angle on the left side when perpendicular polarized light in the left side behind on the plane of reflection 73 of a left side, the refraction takes place for the light path, with it shines to be 90 to send between the base plate 71 on the first convergent mirror 1, shine to with 30 angle on the right side behind on the plane of reflection 74 of a right side, the refraction takes place for the light path, with it shines to be 90 to send between the base plate 71 on the first convergent mirror 1. The greater the number of the three-edged reflectors 72, the better the uniformity of the reflected light, and the best effect can be achieved when the horizontal resolution of the digital micromirror is higher.
Referring to fig. 1, a polarized light source controller 8 is connected to the polarized light source, and controls the vertical polarized light source 61 and the horizontal polarized light source 62 to emit light alternately, and the alternate time is synchronized with the frame switching of the color wheel 2, that is, when the color wheel 2 rotates three color regions, the vertical polarized light source 61 is switched to the horizontal polarized light source 62, or the horizontal polarized light source 62 is switched to the vertical polarized light source 61. Due to the design of the polarized light source controller 8, the vertical polarized light source 61 and the horizontal polarized light source 62 alternately emit light, that is, the vertical polarized light and the horizontal polarized light are alternately emitted to the first converging mirror 1 through the light combining mirror 7, and the time of the two light sources is synchronous with the frame switching of the color wheel 2, so that two adjacent frames rotated by the color wheel 2 are respectively the horizontal polarized light and the vertical polarized light, that is, an even frame is the horizontal polarized light, an odd frame is the vertical polarized light, or an even frame is the vertical polarized light, and an odd frame is the horizontal polarized light.
Referring to fig. 5, the caption data generating module 9 is configured to generate caption data, where the caption data includes caption stroke area pixel data and non-caption stroke area pixel data, and the data values of the two are different, the values of all the caption stroke area pixel data are equal, and the values of all the non-caption stroke area pixel data are equal; in the present embodiment, the subtitle data is represented by a binary image, for example, 1 represents a pixel of a subtitle stroke region, and 0 represents a pixel of a non-subtitle stroke region. If the cross characters are expected to be displayed on the current frame picture, the cross character areas in the current frame data are the pixel data of the caption stroke areas, and the areas without the cross characters are the pixel data of the non-caption stroke areas. The subtitle data generating module 9 is known in the art and is well known to those skilled in the art, and will not be described herein.
The video data generating module 10 receives media signals, such as VGA, video and other media signals, transmitted from an external interface of the projector, and generates video data for driving the digital micromirror 4 through conversion processing, the resolution of the subtitle data generated by the subtitle data generating module 9 is equal to the resolution of the video data generated by the video data generating module 10, and pixels of the two have a one-to-one correspondence relationship; the video data generating module 10 is known to those skilled in the art and will not be described herein.
The subtitle data generating module 9 and the video data generating module 10 are respectively connected to the subtitle superimposing module 11; the subtitle data generating module 9 inputs the generated subtitle data into the subtitle superimposing module 11, the video data generating module 10 inputs the generated video data into the subtitle superimposing module 11, and the subtitle superimposing module 11 processes the video data according to the subtitle data and superimposes the subtitle information onto the video data.
And the digital micromirror driving module 41, where the digital micromirror driving module 41 is connected between the caption superimposing module 11 and the digital micromirror 4, and is configured to receive the video data output by the caption superimposing module 11, and then drive the digital micromirror 4 to display a picture containing the invisible caption information on the imaging plane 15.
And the polarization direction of the polarization glasses 12 is kept vertical or horizontal. The polarized glasses 12 may be formed by a polarized film attached to general glasses, and may be conveniently used by a person wearing the glasses at ordinary times. When the user wears the polarized glasses 12, the closed captions can be observed, and other people who do not wear the polarized glasses 12 can not find the captions on the imaging plane 15 at all.
Furthermore, the polarized light source is a laser polarized light source, and by adopting the polarized light source, the light intensity cannot be attenuated in the transmission process of light.
Referring to fig. 7 and 8, the lens of the polarized glasses 12 is composed of a plurality of polarized areas 13 and unpolarized areas 14, in this embodiment, the polarized areas 13 are rectangular polarized blocks, the unpolarized areas 14 are rectangular blocks, and the rectangular polarized blocks of the polarized areas 13 are uniformly distributed in an interlaced manner with the rectangular blocks in the unpolarized areas 14, see fig. 7 and 8; the area of each polarized region 13 is less than 0.02 square millimeters and the transparency of the rectangular block of unpolarized regions 14 is high. By arranging the polarization areas 13 and the non-polarization areas 14 which are distributed in a staggered mode on the lenses of the polarization glasses 12, after a user wears the polarization glasses 12, the hidden prompting words can be observed on the imaging plane 15 through the polarization areas 13, but the hidden prompting words cannot be observed on the imaging plane 15 when the user passes through the non-polarization areas 14, but the transparency of the non-polarization areas 14 is higher, the non-polarization areas 14 are the same as common glasses or myopia glasses, and the purpose of arranging the polarization areas 13 and the non-polarization areas 14 in a staggered mode is to improve the transparency of the glasses, and although the contrast of the prompting words is reduced to a certain extent, the prompter cannot be watched. After the user wears the polarized glasses 12, the hidden cue words can be observed, and other people who do not wear the polarized glasses 12 can not find out that the cue words exist on the imaging plane 15 at all.
The projection principle of the projector system is as follows:
the light generated by the polarized light source passes through the light-combining reflector 7, then irradiates to the first converging mirror 1, converges after passing through the first converging mirror 1, and converges to the color area surface of the color wheel 2, and the light passes through the color wheel 2, then is outwards diffused to the second converging mirror 3 from a converging point, and irradiates to the digital micromirror 4 after passing through the second converging mirror 3; then, the processed video data drives the digital micromirror 4 through the digital micromirror driving module 41 to reflect the image containing the hidden subtitles onto the lens 5, and then the image is magnified and projected onto the imaging plane 15 through the lens 5, so as to form a projection area on the imaging plane 15.
The video data processing method of the light-combining reflector invisible hint projector system comprises the following steps:
firstly, inputting the caption data and the video data into the caption superposition module 11;
step two, the caption superposition module 11 sequentially detects the pixel data of the caption data corresponding to the current video frame, and if the caption data is the pixel data of the caption pen-drawing area, detects the corresponding video data at the same position, and if the brightness value of the pixel data of the video data is less than 50% of the maximum brightness value that can be represented by the pixel data of the video data, processes the video data, and the processing method is as follows: the brightness value of the data corresponding to the current frame is reset to zero, the brightness value of the data corresponding to the next frame is doubled, at this time, because the increased brightness value and the decreased brightness value of the two front and back frames are the same, the visual effect is the same as that of the non-processed frames due to the persistence of vision effect of human eyes, so that the audience cannot see the subtitles superimposed on the video, for example, when the brightness value of the pixel data of the video data is 50%, the brightness value of the data corresponding to the current frame is reset to zero, the brightness value of the data corresponding to the next frame is 100%, and when the brightness value of the pixel data of the video data is 40%, the brightness value of the data corresponding to the current frame is reset to zero, and the brightness value of the data corresponding to the next frame is 80%; if the caption data detected by the caption superposition module 11 is the pixel data of the non-caption pen area, the brightness value of the corresponding video data is kept unchanged;
and step three, taking the next frame as the current frame, and repeating the step two.
In the second step, if the brightness value of the pixel data of the video data is greater than 50% of the maximum brightness value, the brightness value of the corresponding data of the current frame is processed in the following manner: the luminance value of the current frame corresponding data is equal to (current luminance value- (maximum luminance value — current luminance value)), and the luminance value of the next frame corresponding data is the maximum luminance value. By adding this step, it is possible to cope with a case where the luminance value of the pixel data of the video data is greater than 50% of the maximum luminance value. By the above improvement, the range of the hidden subtitle superimposition can be increased.
A step is added between the third step and the fourth step: the caption superposition module 11 compares the data signals of the current frame and the next frame of the video, if the average value of the difference between the brightness values of the corresponding pixels of the two frames is greater than 5% of the maximum brightness value which can be expressed by the pixels of the video data, the video of the current frame is not processed, the next frame is compared with the following frame, otherwise, the next step is carried out. Therefore, the problem that when the brightness difference of the front frame and the rear frame of the video is large, the front frame and the rear frame cannot be completely complemented by using the processing method in the step two, and the watching effect is influenced can be solved.
The caption data generating module 9 is generally disposed in a computer outside the projector, and the computer is in signal connection with the caption superimposing module 11, and the signal connection mode is through a digital interface such as HDMI or DVI.
The broadcast PPT is the most commonly used mode for projectors, and the data processing principle is described below by taking the PPT as an example:
if it is desired to overlay the closed captioning on the page of the PPT, the following process is required: the video data generation module 10 receives PPT information transmitted from a computer through a VGA port, converts PPT signals to generate video data which accords with the resolution and frame frequency of a projector, the caption data generation module 9 is installed in the computer, caption data generated by the caption data generation module 9 is transmitted to the caption superposition module 11 through an HDMI or DVI port, and the caption resolution generated by the caption data generation module 9 is the same as the resolution of the video signals;
supposing that the caption of the cue word is a pattern with a cross character in the middle, the data corresponding to a cross stroke area is 1, the data of other areas is 0, the video image is a gray pattern with a gray value of 40%, the caption superposition module 11 firstly detects the caption pixel data in sequence when working, and if the data is 0, the pixel data at the corresponding position of the video is not changed, or the gray value is 40%; detecting caption pixel data as 1, detecting data at a position corresponding to a video, wherein the brightness value of the video pixel data is 40%, because the brightness value is less than 50% of the maximum brightness value, the brightness value of the data corresponding to the current frame is zeroed, the brightness value of the data corresponding to the next frame is doubled to 80%, after the video image is processed by the upper step, the brightness value of the pixels in the stroke area of the current frame is zeroed, the schematic diagram after the zeroing is shown in a in fig. 6), the brightness value of the pixels in the stroke area of the next frame is doubled, the schematic diagram after the doubling is shown in b in fig. 6), the increased and decreased brightness values of two previous and next frames are the same, because the visual persistence effect of human eyes is the same as that of the non-processed frames, the frame frequency of the projector is basically more than 60 frames at present, no stroboscopic effect exists, and thus the image data at the position of the cross word seen by the common audience through the imaging plane 15 is the same as that of the non-processed frames, the visual perception brightness value is again 40%, see c in fig. 6); therefore, the video image seen by the common audience is the same as that before the caption is added, and has no change;
because the actual brightness values of two frames after the processing of the cross position are different, the brightness value of one frame is 0, the brightness value of the other frame is 80%, the actual brightness values are different from the brightness of 40% of a non-cross stroke area of 40%, and because the light combination reflector 7 is controlled by the polarized light source controller 8, two adjacent frames are respectively horizontal polarized light and vertical polarized light, namely, an even frame is horizontal polarized light, an odd frame is vertical polarized light, or an even frame is vertical polarized light, and an even frame is horizontal polarized light;
the user can observe the caption data on the imaging plane 15 through the polarized glasses 12; when the polarization direction of the polarization glasses 12 is horizontal, the frames of the vertically polarized light on the imaging plane 15 will be filtered out, and the frames of the horizontally polarized light will be seen, so that the caption information formed by the frames of the horizontally polarized light can be seen on the imaging plane 15 after wearing the polarization glasses 12; when the polarization direction of the polarization glasses 12 is vertical, frames of horizontally polarized light on the imaging plane 15 will be filtered out, and frames of vertically polarized light will be seen, so that caption information formed by the frames of vertically polarized light can be seen on the imaging plane 15 after the polarization glasses 12 are worn; that is, after wearing the glasses, the even frame or the odd frame can be observed on the imaging plane 15 only regardless of whether the polarized glasses 12 are horizontal or vertical, and the subtitle can not be seen if the glasses are not worn, or if one of the two adjacent frames, that is, the cross-shaped frame with the luminance value of 0 or the cross-shaped frame with the luminance value of 80%, is one. The invention can be used as a common projector, can realize the function of prompting the speaker at the same time, and can not influence the watching of the audience.
When designing courseware, if the caption is required to be displayed clearly, the content with the gray scale in the upper range is required to be used more on the picture, and the caption is hidden in the gray scale area, so that the best effect is achieved when the gray scale value is 30% of the highest brightness, therefore, if the invisible prompting function is required to be used, the prompt words are placed in the gray background area when designing courseware, preferably, the background with the gray scale of about 30% is used.
The caption data generation module 9 is placed on a computer, the computer can be connected with a projector through interfaces such as HDMI or DVI, the caption data generation module 9 has the function of switching between display and non-display of captions, and the caption switching function is the prior art and is not described herein again.
The pixel brightness value processing method comprises the following steps: firstly, converting an RGB color mode corresponding to video data into an HSI mode, namely converting three numerical values of red, green and blue colors corresponding to the video data into three numerical values of hue, saturation and brightness, then independently increasing and decreasing the brightness numerical value, and then converting the processed HSI value into an RGB value. The above processing method is the prior art and is not described herein again.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The video data processing method of the light-combined reflector invisible suggestion projector system comprises a first converging mirror, a color wheel, a second converging mirror, a digital micromirror and a lens, and is characterized by further comprising the following steps:
a polarized light source comprising a vertically polarized light source and a horizontally polarized light source;
the light combining reflector is arranged on the front side of the first converging mirror and comprises a substrate, a triangular reflector array is arranged on the substrate, the triangular reflector is of a triangular prism structure, the cross section of the triangular prism structure is an isosceles triangle, two prismatic surfaces corresponding to the waist of the isosceles triangle are used as reflecting surfaces, the bottom surface of the triangular reflector array is attached to the substrate, the two reflecting surfaces of the triangular reflector are a left reflecting surface and a right reflecting surface respectively, and the included angle between the left reflecting surface and the bottom surface and the included angle between the right reflecting surface and the bottom surface are both 30 degrees; the three-edge reflector is vertically arranged, the vertex angle of the vertical polarized light source and the horizontal polarized light source face the first converging mirror, the vertical polarized light source and the horizontal polarized light source are respectively arranged in front of the left side and the right side of the three-edge reflector, the polarized light generated by the polarized light source on the left side is irradiated onto the left reflecting surface and then reflected onto the first converging mirror by the left reflecting surface, the polarized light generated by the polarized light source on the right side is irradiated onto the right reflecting surface and then reflected onto the first converging mirror by the right reflecting surface, and the included angles between the irradiation directions of the left polarized light source and the right polarized light source and the substrate are both 30 degrees;
the polarized light source controller is connected with the polarized light source and controls the vertical polarized light source and the horizontal polarized light source to alternately emit light, and the alternate time is synchronous with the frame switching of the color wheel, namely when the color wheel rotates three color areas, the vertical polarized light source is just switched to the horizontal polarized light source, or the horizontal polarized light source is just switched to the vertical polarized light source;
the caption data generating module is used for generating caption data, wherein the caption data comprises caption stroke area pixel data and non-caption stroke area pixel data, the data values of the caption stroke area pixel data and the non-caption stroke area pixel data are different in size, the values of all the caption stroke area pixel data are equal, and the values of all the non-caption stroke area pixel data are equal;
the video data generation module receives a media signal transmitted by an external interface of the projector, generates video data for driving the digital micromirror through conversion processing, and generates subtitle data with the resolution equal to that of the video data generated by the video data generation module, wherein pixels of the subtitle data and the video data have one-to-one correspondence relationship;
the subtitle data generation module and the video data generation module are respectively connected to the subtitle superposition module; the subtitle data generating module inputs the generated subtitle data into the subtitle superposition module, the video data generating module inputs the generated video data into the subtitle superposition module, and the subtitle superposition module processes the video data according to the subtitle data and superposes subtitle information onto the video data;
the digital micromirror driving module is connected between the caption superposition module and the digital micromirror, and is used for receiving the video data output by the caption superposition module and then driving the digital micromirror to display a picture containing the invisible caption information on an imaging plane;
polarization glasses of which polarization directions are maintained vertical or horizontal;
the video data processing method comprises the following steps:
step one, inputting the caption data and the video data into the caption superposition module;
step two, the caption superposition module detects the pixel data of the caption data corresponding to the current video frame in sequence, if the caption data is the pixel data of the caption pen stroke area, the corresponding video data at the same position is detected, if the brightness value of the pixel data of the video data is less than 50% of the maximum brightness value which can be expressed by the pixel data of the video data, the video data is processed, and the processing method is as follows: the brightness value of the data corresponding to the current frame is reset to zero, and the brightness value of the data corresponding to the next frame is doubled; if the caption data detected by the caption superposition module is the pixel data of the non-caption pen area, the brightness value of the corresponding video data is kept unchanged;
if the brightness value of the pixel data of the video data is greater than 50% of the maximum brightness value, the brightness value of the corresponding data of the current frame is processed in the following manner: the luminance value of the current frame corresponding data becomes (current luminance value- (maximum luminance value-current luminance value)), and the luminance value of the next frame corresponding data becomes the maximum luminance value;
and step three, taking the next frame as the current frame, and repeating the step two.
2. The video data processing method of the light-combining mirror invisible cue projector system as set forth in claim 1, wherein: the polarized light source is a laser polarized light source.
3. The video data processing method of the light-combining mirror invisible cue projector system as set forth in claim 1, wherein: the lens of the polarized glasses is composed of polarized areas and non-polarized areas in an interlaced mode, and the area of each polarized area is smaller than 0.02 square millimeter.
4. The video data processing method of the light-combining mirror invisible cue projector system as set forth in claim 1, wherein: a step is added between the step one and the step two: the caption superposition module compares the data signals of the current frame and the next frame of the video, if the average value of the difference of the brightness values of the corresponding pixels of the two frames is more than 5 percent of the maximum brightness value which can be expressed by the pixels of the video data, the video of the current frame is not processed, the comparison of the next frame and the following frame is carried out, otherwise, the next step is carried out.
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| CN202010164401.6A CN111246191A (en) | 2020-03-11 | 2020-03-11 | Light-combined reflector invisible prompter projector system and video data processing method |
| CN2020101644016 | 2020-03-11 |
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| CN111866480A CN111866480A (en) | 2020-10-30 |
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| CN202010548681.0A Withdrawn CN111510696A (en) | 2020-03-11 | 2020-06-16 | Light-combined reflector invisible prompter projector system and video data processing method |
| CN202010735490.5A Active CN111683236B (en) | 2020-03-11 | 2020-07-28 | Light-combining reflector invisible prompter projector system and data superposition processing method |
| CN202010913598.9A Active CN111866480B (en) | 2020-03-11 | 2020-09-03 | Light-combined reflector invisible prompter projector system and video data processing method |
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| CN202010548681.0A Withdrawn CN111510696A (en) | 2020-03-11 | 2020-06-16 | Light-combined reflector invisible prompter projector system and video data processing method |
| CN202010735490.5A Active CN111683236B (en) | 2020-03-11 | 2020-07-28 | Light-combining reflector invisible prompter projector system and data superposition processing method |
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Also Published As
| Publication number | Publication date |
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| CN111510696A (en) | 2020-08-07 |
| CN111866480A (en) | 2020-10-30 |
| CN111683236A (en) | 2020-09-18 |
| CN111683236B (en) | 2021-08-31 |
| CN111246191A (en) | 2020-06-05 |
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