CN111246192A - Invisible prompter projector system and video data processing method - Google Patents
Invisible prompter projector system and video data processing method Download PDFInfo
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- CN111246192A CN111246192A CN202010181450.0A CN202010181450A CN111246192A CN 111246192 A CN111246192 A CN 111246192A CN 202010181450 A CN202010181450 A CN 202010181450A CN 111246192 A CN111246192 A CN 111246192A
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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
- 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]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
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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
- 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
- H04N9/3188—Scale or resolution adjustment
Abstract
The invention discloses a hidden prompter projector system, which comprises a light source, a first convergent mirror, a color wheel, a second convergent mirror, a digital micromirror driving module and a lens, and also comprises: the device comprises a frame synchronization signal transmitting module, liquid crystal glasses, a subtitle data generating module, a video data generating module and a subtitle superposing module; 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 an invisible word-prompting 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 the 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: stealthy suggestion projector system includes light source, first convergent mirror, colour wheel, second convergent mirror, digital micromirror drive module, camera lens, still includes:
the frame synchronization signal transmitting module is connected with the digital micromirror driving module, the digital micromirror driving module is connected with the digital micromirror, and the frame synchronization signal transmitting module takes the frame switching starting time as a synchronization signal;
the liquid crystal glasses comprise lenses formed by liquid crystal panels, wherein each liquid crystal panel sequentially comprises a first polarizer layer, a first glass substrate layer, a first transparent electrode layer, a liquid crystal layer, a second transparent electrode layer, a second glass substrate layer and a second polarizer layer; the liquid crystal glasses further comprise a liquid crystal panel driving circuit connected with the liquid crystal layer in the liquid crystal panel, and the liquid crystal panel is switched between a transparent state and an opaque state under the control of the liquid crystal panel driving circuit; the liquid crystal glasses also comprise a frame synchronization signal receiving module connected with the liquid crystal panel driving circuit, wherein the frame synchronization signal receiving module receives a frame synchronization signal transmitted by the frame synchronization signal transmitting module and transmits the frame synchronization signal to the liquid crystal panel driving circuit, so that the liquid crystal panel driving circuit generates a liquid crystal panel control signal synchronous with the frame synchronization signal, and the liquid crystal panel control signal controls the liquid crystal panel to switch between transparent and non-transparent;
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, and the subtitle superposition module is connected to the digital micromirror; the subtitle data generation module inputs generated subtitle data into the subtitle superposition module, the video data generation module inputs the generated video data into the subtitle superposition module, the subtitle superposition module processes the video data according to the subtitle data and superposes subtitle information onto the video data, the video data superposed with the subtitle information drives the digital micromirror, and finally, a picture containing invisible subtitle information is displayed on an imaging plane.
As a preferable technical solution, the first polarizer layer and the second polarizer layer of the liquid crystal panel are formed by interleaving polarized regions and unpolarized regions, and the area of each polarized region is less than 0.02 square millimeter.
Preferably, the light source is a laser polarized light source.
As a preferred technical solution, a video data processing method of an invisible cue 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 block diagram of the relationship between the frame synchronization signal transmitting module and the liquid crystal glasses according to the embodiment of the present invention;
FIG. 3 is a block diagram of data processing according to an embodiment of the present invention;
FIG. 4 is a data processing diagram according to an embodiment of the present invention;
FIG. 5 is a schematic view of liquid crystal glasses according to an embodiment of the present invention;
FIG. 6 is an enlarged schematic view at I of FIG. 5;
in the figure: 1-a light source; 2-a first converging mirror; 3-a color wheel; 4-a second converging lens; 5-digital micromirror; 51-digital micromirror drive circuit; 6-lens; 7-frame synchronization signal transmitting module; 8-liquid crystal glasses; 9-subtitle data generating module; 10-a video data generation module; 11-a subtitle superposition module; 12-liquid crystal panel drive circuit; 13-frame synchronization signal receiving module; 14-an imaging plane; 15-a polarization region; 16-unpolarized region.
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 word-extracting projector system includes a light source 1, a first converging mirror 2, a color wheel 3, a second converging mirror 4, a digital micromirror 5(DMD), a digital micromirror driving circuit 51, a lens 6, and further includes: the system comprises a frame synchronization signal transmitting module 7, liquid crystal glasses 8, a caption data generating module 9, a video data generating module 10 and a caption superposition module 11; the light source 1, the first converging lens 2, the color wheel 3, the second converging lens 4, the digital micromirror 5, the digital micromirror driving circuit 51, and the lens 6 all belong to a part of the existing projector, and belong to the prior art, and are not described herein again.
Referring to fig. 2, the frame synchronization signal transmitting module 7 is connected to the digital micromirror driving circuit 51, the digital micromirror driving circuit 51 is connected to the digital micromirror 5, and the frame synchronization signal transmitting module 7 modulates the frame switching start time of the digital micromirror 5 as a synchronization signal onto a wireless carrier to be transmitted, so as to implement transmission of a wireless signal; the frame synchronization signal transmitting module 7 functions as: when the digital micromirror 5 is switched from the current frame to the next frame, the frame synchronization signal transmitting module 7 transmits a signal of the starting time when the current frame is switched to the next frame, that is, the signal when the frame is switched is transmitted as a synchronization signal, which is equivalent to a trigger signal, and the frame synchronization signal transmitting module 7 transmits the switching of each frame of the digital micromirror 5 in a cyclic reciprocating manner.
Referring to fig. 2, the lenses of the liquid crystal glasses 8 are made of a liquid crystal panel, that is, the lenses of the liquid crystal glasses 8 are made of a liquid crystal panel material, and the liquid crystal panel sequentially includes a first polarizer layer, a first glass substrate layer, a first transparent electrode layer, a liquid crystal layer, a second transparent electrode layer, a second glass substrate layer, and a second polarizer layer; the liquid crystal panel has the same structure as the liquid crystal panel in the prior art, and is not described herein again for the prior art.
Referring to fig. 2, the liquid crystal glasses 8 further include a liquid crystal panel driving circuit 12 connected to the liquid crystal layer of the liquid crystal panel, the liquid crystal panel is switched between a transparent state and an opaque state under the control of the liquid crystal panel driving circuit 12, and the liquid crystal panel driving circuit 12 is prior art and will not be described herein again.
Referring to fig. 2, the liquid crystal glasses 8 further include a frame synchronization signal receiving module 13 connected to the liquid crystal panel driving circuit 12, wherein the frame synchronization signal receiving module 13 obtains a wireless signal through a wireless carrier, that is, the frame synchronization signal receiving module 13 receives the frame synchronization signal transmitted from the frame synchronization signal transmitting module 7 and transmits the frame synchronization signal to the liquid crystal panel driving circuit 12, so that the liquid crystal panel driving circuit 12 generates a liquid crystal panel control signal synchronized with the frame synchronization signal, and the liquid crystal panel control signal controls the liquid crystal panel to switch between transparent and opaque. When the current frame of the digital micromirror 5 is switched to the next frame, the frame synchronization signal emitting module 7 emits the synchronization signal switching from the current frame to the next frame, the frame synchronization signal receiving module 13 receives the switched synchronization signal and then transmits the synchronization signal to the liquid crystal panel driving circuit 12, the liquid crystal panel driving circuit 12 controls the liquid crystal panel to be switched from a pressurized (or non-pressurized) state to a non-pressurized (or pressurized) state, i.e. the liquid crystal panel is switched from a non-transparent (or transparent) state to a transparent (or non-transparent) state, the frame synchronization signal emitting module 7 and the frame synchronization signal receiving module 13 control the switching of the liquid crystal panel, so that the transparent or non-transparent state corresponds to two adjacent frames of the digital micromirror 5 respectively, i.e. the frame corresponds to the transparent odd frame, or the even frames are correspondingly opaque and the odd frames are correspondingly transparent.
In this embodiment, the liquid crystal panel driving circuit 12 and the frame synchronization signal receiving module 13 are integrated in the liquid crystal glasses.
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 5 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 caption data generating module 9 and the video data generating module 10 are respectively connected to the caption superimposing module 11, the caption superimposing module 11 is connected to the digital micromirror driving circuit 51, and the digital micromirror driving circuit 51 is connected to the digital micromirror 5, as shown in fig. 3; 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, the subtitle superimposing module 11 processes the video data according to the subtitle data, superimposes the subtitle information onto the video data, and the video data superimposed with the subtitle information drives the digital micromirror 5 to finally display the picture containing the invisible subtitle information on the imaging plane 14.
Referring to fig. 5 and 6, the first polarizer layer and the second polarizer layer of the liquid crystal panel are both composed of a plurality of polarization regions 15 and non-polarization regions 16 which are interlaced, the distribution of the polarization regions 15 and the non-polarization regions 16 on the first polarizer layer and the second polarizer layer is completely the same, in this embodiment, the polarization regions 15 are rectangular polarization blocks, the non-polarization regions 16 are rectangular blocks, and the rectangular polarization blocks of the polarization regions 15 are uniformly interlaced with the rectangular blocks in the non-polarization regions 16, see fig. 5 and 6; the area of each polarized region 15 is less than 0.02 square millimeters and the transparency of the rectangular block of unpolarized regions 16 is high. By arranging the polarization regions 15 and the non-polarization regions 16 on the first polarizer layer and the second polarizer layer of the liquid crystal glasses 8 in a staggered manner, after a user wears the liquid crystal glasses 8, the hidden prompt words can be observed on the imaging plane 14 through the polarization regions 15, but the hidden prompt words cannot be observed on the imaging plane 14 when the user passes through the non-polarization regions 16, but the non-polarization regions 16 have higher transparency, the non-polarization regions 16 are the same as common glasses or myopia glasses, and the purpose of arranging the polarization regions 15 and the non-polarization regions 16 in a staggered manner is to improve the transparency of the glasses, reduce the contrast of the prompt words to a certain extent, but not influence the prompter watching device. After the user wears the liquid crystal glasses 8, the hidden cue words can be observed, and other people who do not wear the liquid crystal glasses can not find that the cue words exist on the imaging plane 14 at all.
The light source is a laser polarized light source, the polarization directions of the laser polarized light source and the first polarizer layer of the liquid crystal panel are the same, and therefore when light passes through the polarizer layer, the light intensity cannot be attenuated.
When the user wears the liquid crystal glasses, the closed captions can be observed, and other people who do not wear the liquid crystal glasses can not find that the captions are on the imaging plane 14 at all.
The projection principle of the projector system is as follows:
the light generated by the light source 1 irradiates to the first converging lens 2, passes through the first converging lens 2, reaches the color area surface of the color wheel 3, passes through the color wheel 2, reaches the second converging lens 4, passes through the second converging lens 4 and irradiates to the digital micromirror 5; then the processed video data is transmitted to the digital micro-mirror driving circuit 51 to drive the digital micro-mirror 5 to reflect the image containing the hidden subtitles to the lens 6, and then the image is magnified and projected to the imaging plane 14 through the lens 6, and a projection area is formed on the imaging plane 14.
The video data processing method of the invisible suggestion 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; 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 as a in fig. 4), the brightness value of the pixels in the stroke area of the next frame is doubled, the schematic diagram after the doubling is shown as b in fig. 4), the increased and decreased brightness values of two front and rear 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 on the imaging plane 14, the visual perception brightness value is again 40%, see c in fig. 4); therefore, the video image seen by the common audience is the same as that before the caption is added, and has no change;
since the actual brightness values of the two frames processed at the cross position are different, the brightness value of one frame is 0, the brightness value of the other frame is 80%, and the brightness of the two frames is different from the brightness of 40% of the non-cross stroke area of 40%, after the liquid crystal glasses 8 are worn, because the liquid crystal glasses 8 control the switching of the liquid crystal panel through the frame synchronization signal transmitting module 7 and the frame synchronization signal receiving module 13, the light transmission or the light non-transmission respectively corresponds to two adjacent frames of the digital micromirror 5, that is, the even frame is corresponding to the transparent odd frame and is not transparent, or the even frame is corresponding to the opaque odd frame and is transparent, therefore, the light of the two adjacent frames after passing through the liquid crystal glasses 8 is respectively transparent and opaque, therefore, only odd frames or even frames can be seen through the liquid crystal glasses 8, and the user can observe caption data on the imaging plane 14 through the liquid crystal glasses; that is, after wearing glasses, only even frame or odd frame images can be observed on the imaging plane 14, and one of the two adjacent frames, that is, the word "ten" on the frame with the brightness value of 0 or the word "ten" on the frame with the brightness value of 80%, can not see the caption without wearing glasses. 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 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 (6)
1. Stealthy suggestion projector system includes light source, first convergent mirror, colour wheel, second convergent mirror, digital micromirror drive module, camera lens, its characterized in that still includes:
the frame synchronization signal transmitting module is connected with the digital micromirror driving module, the digital micromirror driving module is connected with the digital micromirror, and the frame synchronization signal transmitting module takes the frame switching starting time as a synchronization signal;
the liquid crystal glasses comprise lenses formed by liquid crystal panels, wherein each liquid crystal panel sequentially comprises a first polarizer layer, a first glass substrate layer, a first transparent electrode layer, a liquid crystal layer, a second transparent electrode layer, a second glass substrate layer and a second polarizer layer; the liquid crystal glasses further comprise a liquid crystal panel driving circuit connected with the liquid crystal layer in the liquid crystal panel, and the liquid crystal panel is switched between a transparent state and an opaque state under the control of the liquid crystal panel driving circuit; the liquid crystal glasses also comprise a frame synchronization signal receiving module connected with the liquid crystal panel driving circuit, wherein the frame synchronization signal receiving module receives a frame synchronization signal transmitted by the frame synchronization signal transmitting module and transmits the frame synchronization signal to the liquid crystal panel driving circuit, so that the liquid crystal panel driving circuit generates a liquid crystal panel control signal synchronous with the frame synchronization signal, and the liquid crystal panel control signal controls the liquid crystal panel to switch between transparent and non-transparent;
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, and the subtitle superposition module is connected to the digital micromirror; the subtitle data generation module inputs generated subtitle data into the subtitle superposition module, the video data generation module inputs the generated video data into the subtitle superposition module, the subtitle superposition module processes the video data according to the subtitle data and superposes subtitle information onto the video data, the video data superposed with the subtitle information drives the digital micromirror, and finally, a picture containing invisible subtitle information is displayed on an imaging plane.
2. The invisible cue projector system of claim 1 wherein: the first polarizer layer and the second polarizer layer of the liquid crystal panel are formed by interleaving polarized regions and non-polarized regions, and the area of each polarized region is less than 0.02 square millimeter.
3. The invisible cue projector system of claim 1 wherein: the light source is a laser polarized light source.
4. The video data processing method using the invisible word-prompting projector system as claimed in 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;
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.
5. The video data processing method of the invisible word-prompting projector system as claimed in claim 4, characterized in that: adding the following components 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 becomes the maximum luminance value.
6. The video data processing method of the invisible word-prompting projector system as claimed in claim 4, characterized in that: 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.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010181450.0A CN111246192A (en) | 2020-03-16 | 2020-03-16 | Invisible prompter projector system and video data processing method |
| CN202010547809.1A CN111491147A (en) | 2020-03-16 | 2020-06-16 | Invisible prompter projector system and video data processing method |
| CN202010913368.2A CN111866478B (en) | 2020-03-16 | 2020-09-03 | Invisible prompter projector system and video data processing method |
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| CN202010181450.0A CN111246192A (en) | 2020-03-16 | 2020-03-16 | Invisible prompter projector system and video data processing method |
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| CN202010547809.1A Withdrawn CN111491147A (en) | 2020-03-16 | 2020-06-16 | Invisible prompter projector system and video data processing method |
| CN202010913368.2A Active CN111866478B (en) | 2020-03-16 | 2020-09-03 | Invisible prompter projector system and video data processing method |
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| CN202010913368.2A Active CN111866478B (en) | 2020-03-16 | 2020-09-03 | Invisible prompter projector system and video data processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5793470A (en) * | 1995-05-22 | 1998-08-11 | The Walt Disney Company | Latent-image projection system and method |
| US20050041163A1 (en) * | 2003-05-07 | 2005-02-24 | Bernie Butler-Smith | Stereoscopic television signal processing method, transmission system and viewer enhancements |
| TWI284291B (en) * | 2005-12-27 | 2007-07-21 | Inventec Besta Co Ltd | A subtitle display method and the device thereof |
| JP5944904B2 (en) * | 2010-09-20 | 2016-07-05 | フラウンホーファーゲゼルシャフト ツール フォルデルング デル アンゲヴァンテン フォルシユング エー．フアー． | Method for distinguishing landscape background from foreground, and method for replacing background in landscape image |
| KR20130064944A (en) * | 2011-12-09 | 2013-06-19 | 문쌍국 | Polarized glasses for selectively viewing closed captioning |
| CN103731615B (en) * | 2012-10-11 | 2017-02-08 | 晨星软件研发(深圳)有限公司 | Display method and display device |
| US20150268547A1 (en) * | 2014-03-21 | 2015-09-24 | Lockheed Martin Corporation | Removing and recombining a portion of a projected light stream |
| CN204807824U (en) * | 2015-06-25 | 2015-11-25 | 高深 | Digit polarization space division image device |
| CN107862315B (en) * | 2017-11-02 | 2019-09-17 | 腾讯科技（深圳）有限公司 | Subtitle extraction method, video searching method, subtitle sharing method and device |
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- 2020-06-16 CN CN202010547809.1A patent/CN111491147A/en not_active Withdrawn
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| CN111866478B (en) | 2021-09-28 |
| CN111866478A (en) | 2020-10-30 |
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