CN111556302A - Double-light-source beam combiner invisible prompter projector system and video data processing method - Google Patents
Double-light-source beam combiner invisible prompter projector system and video data processing method Download PDFInfo
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- CN111556302A CN111556302A CN202010435768.7A CN202010435768A CN111556302A CN 111556302 A CN111556302 A CN 111556302A CN 202010435768 A CN202010435768 A CN 202010435768A CN 111556302 A CN111556302 A CN 111556302A
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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]
- H04N9/3179—Video signal processing therefor
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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
- 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]
- H04N9/3138—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using arrays of modulated light sources
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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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- 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
- H04N9/315—Modulator illumination systems
- H04N9/3167—Modulator illumination systems for polarizing the light beam
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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]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
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Abstract
The invention discloses a double-light source beam combiner invisible prompter projector system, which comprises a first converging lens, a color wheel, a second converging lens, a digital micromirror and a lens, and also comprises: the device comprises a polarized light source, a polarized beam combiner, 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, and projecting the processed video data onto an imaging plane by a digital micromirror; 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 double-light-source beam combiner 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 double-light-source beam combiner 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 cannot influence audiences.
In order to solve the technical problems, the technical scheme of the invention is as follows: the invisible suggestion projector system of the double-light source beam combiner comprises a first converging lens, a color wheel, a second converging lens, a digital micromirror and a lens, and further comprises:
a polarized light source comprising a vertically polarized light source and a horizontally polarized light source;
the device comprises a polarization beam combiner, a polarization beam combining surface of the polarization beam combiner and a horizontal plane form an included angle of 45 degrees, a reflected light inlet of the polarization beam combiner is vertically upward, a vertical polarization light source is correspondingly arranged at a transmitted light inlet of the polarization beam combiner, vertical polarization light generated by the vertical polarization light source enters from the transmitted light inlet, a horizontal polarization light source is correspondingly arranged at the upper side of the reflected light inlet of the polarization beam combiner, horizontal polarization light generated by the horizontal polarization light source enters from the reflected light inlet, a first converging mirror is correspondingly arranged at a beam combining light outlet of the polarization beam combiner, and light emitted by the beam combining light outlet of the polarization beam combiner enters into the first converging mirror;
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 scheme, the video data processing method of the double-light-source beam combiner invisible suggestion projector system comprises the following steps:
step one, inputting the caption data and the video data into the caption superposition module;
secondly, the caption superposition module detects the pixel data of the caption data corresponding to the current video frame in sequence, and respectively detects the red, green and blue color values of the corresponding video pixel at the same position if the caption data is the pixel data of the caption stroke area, and respectively processes the red, green and blue color values of the video pixel if the red, green and blue color values of the video pixel are less than 50% of the maximum value which can be expressed by the bit depth, wherein the processing method comprises the following steps: resetting the red, green and blue color values corresponding to the current frame to zero, and doubling the red, green and blue color values corresponding to the next frame; if the caption data detected by the caption superposition module is the pixel data of the non-caption pen area, the red, green and blue color numerical values of the corresponding video pixels are 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 red, green and blue color values of the video pixel are greater than or equal to 50% of the maximum bit depth value, the processing mode of the red, green and blue color values corresponding to the current frame is as follows: the red, green, and blue color values corresponding to the current frame become (current value- (bit depth maximum value-current value)), and the red, green, and blue color values corresponding to the next frame become the bit depth maximum value.
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 structural diagram of a polarization beam combiner according to an embodiment of the present invention;
FIG. 3 is a diagram of an arrangement of a polarization beam combiner laser source according to an embodiment of the present invention;
FIG. 4 is a block diagram of data processing according to an embodiment of the present invention;
FIG. 5 is a data processing diagram according to an embodiment of the present invention;
FIG. 6 is a schematic view of polarizing glasses according to an embodiment of the invention;
FIG. 7 is an enlarged schematic view at I of FIG. 6;
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 polarization beam combiner; 71-a polarization beam combination surface; 72-a transmitted light entrance; 73-reflected light entry; 74-beam combining light outlet; 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 invisible suggestion projector system with dual light sources comprises a first converging lens 1, a color wheel 2, a second converging lens 3, a digital micromirror 4(DMD), a lens 5, and further comprises: the system comprises a polarized light source, a polarized beam combiner 7(PBC), 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 micromirror drive 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. 3, the polarized light source includes a vertical polarized light source 61 and a horizontal polarized light source 62, the vertical polarized light source 61 is used for generating vertical polarized light, the horizontal polarized light source 62 is used for generating horizontal polarized light, and the principle that the vertical polarized light source 61 and the horizontal polarized light source 62 generate polarized light is the prior art and is not described herein again.
Referring to fig. 2 and 3, an included angle between a polarization beam combining plane 71 of the polarization beam combiner 7 and a horizontal plane is 45 °, a transmission light inlet 72, a reflection light inlet 73 and a combined light outlet 74 are disposed on the polarization beam combiner 7, the reflection light inlet 73 of the polarization beam combiner 7 is vertically upward, the vertical polarization light source 61 is correspondingly disposed at the transmission light inlet 72 of the polarization beam combiner 7, a light ray of vertical polarization light generated by the vertical polarization light source 61 enters the polarization beam combiner 7 from the transmission light inlet 72, the horizontal polarization light source 62 is correspondingly disposed at an upper side of the reflection light inlet 73 of the polarization beam combiner 7, and a light ray of horizontal polarization light generated by the vertical polarization light source 61 enters the polarization beam combiner 7 from the reflection light inlet 73; the first converging mirror 1 is correspondingly arranged at a beam combining light outlet 74 of the polarization beam combiner 7, and light emitted from the beam combining light outlet 74 of the polarization beam combiner 7 enters the first converging mirror 1; specifically, referring to fig. 3, the vertical polarization light source 61 is correspondingly disposed on the left side of the transmission light inlet 72 of the polarization beam combiner 7, the horizontal polarization light source 62 is correspondingly disposed on the upper side of the reflection light inlet 73 of the polarization beam combiner 7, the first converging mirror 1 is correspondingly disposed on the right side of the combined light outlet 74 of the polarization beam combiner 7, and after entering the polarization beam combiner 7, the light emitted by the vertical polarization light source 61 and the light emitted by the horizontal polarization light source 62 enter the first converging mirror 1 through the combined light outlet 74 of the polarization beam combiner 7. The polarization beam combiner 7 has the same structure as the polarization beam splitter, and the path of light transmitted in the two devices is reversible, which belongs to the prior art and is not described herein again.
Referring to fig. 3, the 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 polarization beam combiner 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 of images are respectively composed of 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. 4, 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.
Referring to fig. 6 and 7, the lens of the polarized glasses 12 is composed of a plurality of polarized areas 13 and unpolarized areas 14 in an interlaced manner, 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 the unpolarized areas 14 in an interlaced manner, see fig. 6 and 7; 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 polarized light source can adopt an LED polarized light source or a laser polarized light source, preferably a laser polarized light source, and the laser polarized light source does not need to convert unpolarized light into polarized light, so that the utilization rate of light is high.
The projection principle of the projector system is as follows:
the light generated by the polarized light source passes through the polarization beam combiner 7, then irradiates to the first converging lens 1, converges after passing through the first converging lens 1, and converges to the color area surface of the color wheel 2, and after passing through the color wheel 2, the light is outwards diffused to the second converging lens 3 from a converging point, and after passing through the second converging lens 3, irradiates to the digital micromirror 4; 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 invisible suggestion projector system of the double-light-source beam combiner comprises the following steps:
firstly, inputting the caption data and the video data into the caption superposition module 11;
secondly, the caption superposition module 11 sequentially detects the pixel data of the caption data corresponding to the current video frame, and respectively detects the red, green and blue color values of the corresponding video pixel at the same position if the caption data is the pixel data of the caption stroke area, and respectively processes the red, green and blue color values of the video pixel if the red, green and blue color values of the video pixel are less than 50% of the maximum value which can be expressed by the bit depth, wherein the processing method comprises the following steps: resetting the red, green and blue color values corresponding to the current frame to zero, and doubling the red, green and blue color values corresponding to the next frame; at this time, because the increasing and decreasing values of the two previous and subsequent frames are the same, due to the persistence effect of human eyes, the visual effect is the same as that of the non-processed frames, so that the viewer cannot see the subtitles superimposed on the video, for example, when the red, green and blue color values of the video pixel are 50%, the red, green and blue color values corresponding to the current frame are zeroed, the red, green and blue color values corresponding to the next frame are 100%, and if the red, green and blue color values of the video pixel are 40%, the red, green and blue color values corresponding to the current frame are zeroed, and the red, green and blue color values corresponding to the next frame are 80%; if the caption data detected by the caption superposition module 11 is the pixel data of the non-caption pen area, the red, green and blue color values of the corresponding video pixels are kept unchanged;
and step three, taking the next frame as the current frame, and repeating the step two.
In a second step, in step two, are added: if the red, green and blue color values of the video pixel are greater than or equal to 50% of the maximum bit depth value, the processing mode of the red, green and blue color values corresponding to the current frame is as follows: the red, green, and blue color values corresponding to the current frame become (current value- (bit depth maximum value-current value)), and the red, green, and blue color values corresponding to the next frame become the bit depth maximum value. By adding this step, it is used to process the situation when the red, green and blue color values of the video pixel are greater than or equal to 50% of the maximum value of the bit depth. By the above improvement, the range of the hidden subtitle superimposition can be increased.
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 of a position corresponding to a video, wherein the color values of red, green and blue of the video are 40% of the maximum value, because the color values of red, green and blue corresponding to the current frame are reduced to zero because the color values of red, green and blue corresponding to the current frame are reduced to 80% by times because the color values of red, green and blue corresponding to the next frame are less than 50% of the maximum value of bit depth, after the video image is processed by the upper method, the brightness of the pixel in the ten stroke area of the current frame is reduced to zero, the schematic diagram after the zero reduction is shown as a in figure 5), the brightness value of the pixel in the ten stroke area of the next frame is doubled, the schematic diagram after the doubling is shown as b in figure 5), the increased and reduced brightness values of the two front and rear frames are the same, because the persistence effect of vision of human eyes is the same as that without processing, the frame frequency of the projector is basically more than 60 frames at present, no stroboscopic effect exists, so, the visual perception brightness value is again 40%, see c in fig. 5); 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 the non-cross stroke area of 40%, and because the polarization beam combiner 7 is controlled by the polarization 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 image 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 functions of controlling the display and non-display of captions, and the caption switching function is the prior art and is not described in detail herein.
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 (5)
1. The invisible suggestion projector system of the double-light-source beam combiner comprises a first converging lens, a color wheel, a second converging lens, a digital micromirror and a lens, and is characterized by further comprising:
a polarized light source comprising a vertically polarized light source and a horizontally polarized light source;
the device comprises a polarization beam combiner, a polarization beam combining surface of the polarization beam combiner and a horizontal plane form an included angle of 45 degrees, a reflected light inlet of the polarization beam combiner is vertically upward, a vertical polarization light source is correspondingly arranged at a transmitted light inlet of the polarization beam combiner, vertical polarization light generated by the vertical polarization light source enters from the transmitted light inlet, a horizontal polarization light source is correspondingly arranged at the upper side of the reflected light inlet of the polarization beam combiner, horizontal polarization light generated by the horizontal polarization light source enters from the reflected light inlet, a first converging mirror is correspondingly arranged at a beam combining light outlet of the polarization beam combiner, and light emitted by the beam combining light outlet of the polarization beam combiner enters into the first converging mirror;
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.
2. The dual light source beam combiner stealth prompter projector system of claim 1, wherein: the polarized light source is a laser polarized light source.
3. The dual light source beam combiner stealth prompter projector system of 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 dual light source beam combiner hidden prompter projector system of claim 1, characterized in that: the method comprises the following steps:
step one, inputting the caption data and the video data into the caption superposition module;
secondly, the caption superposition module detects the pixel data of the caption data corresponding to the current video frame in sequence, and respectively detects the red, green and blue color values of the corresponding video pixel at the same position if the caption data is the pixel data of the caption stroke area, and respectively processes the red, green and blue color values of the video pixel if the red, green and blue color values of the video pixel are less than 50% of the maximum value which can be expressed by the bit depth, wherein the processing method comprises the following steps: resetting the red, green and blue color values corresponding to the current frame to zero, and doubling the red, green and blue color values corresponding to the next frame; if the caption data detected by the caption superposition module is the pixel data of the non-caption pen area, the red, green and blue color numerical values of the corresponding video pixels are kept unchanged;
and step three, taking the next frame as the current frame, and repeating the step two.
5. The video data processing method of the dual light source beam combiner hidden prompter projector system of claim 4, characterized in that: adding the following components in the second step: if the red, green and blue color values of the video pixel are greater than or equal to 50% of the maximum bit depth value, the processing mode of the red, green and blue color values corresponding to the current frame is as follows: the red, green, and blue color values corresponding to the current frame become (current value- (bit depth maximum value-current value)), and the red, green, and blue color values corresponding to the next frame become the bit depth maximum value.
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