CN111556301B - Projector system with invisible prompting function and video data processing method - Google Patents
Projector system with invisible prompting function and video data processing method Download PDFInfo
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- 238000003672 processing method Methods 0.000 title claims description 11
- 230000010287 polarization Effects 0.000 claims abstract description 49
- 239000011521 glass Substances 0.000 claims abstract description 29
- 238000003384 imaging method Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 3
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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]
- H04N9/3141—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]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
Abstract
The invention discloses a projector system with invisible prompting function, which comprises a light source, a first converging lens, a color wheel, a second converging lens, a digital micromirror and a lens, and also comprises: the device comprises a polarization wheel, a subtitle data generation module, a video data generation module, a subtitle superposition module, a digital micromirror drive module and polarization glasses; processing the video data through a subtitle superposition module, projecting the processed video data onto a lens by a digital micromirror, and then enlarging and projecting the processed video data onto an imaging plane through the lens to form a projection area on the 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 projector system with an invisible prompter function and a video data processing method.
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 projector system with an invisible prompter function and a video data processing method, wherein the projector system is reasonable in design and convenient to use, can be used as a common projector, can realize the prompter function for a speaker at the same time, and cannot influence audiences.
In order to solve the technical problems, the technical scheme of the invention is as follows: take projector system of stealthy function of proposing words, including light source, first convergent mirror, colour wheel, second convergent mirror, digital micromirror, camera lens, still include:
the polarizing wheel is arranged between the first converging mirror and the color wheel, the polarizing wheel and the color wheel are coaxially arranged, an annular polarizing area is arranged on the outer side of the polarizing wheel, the annular polarizing area is divided into two polarizing areas along the diameter of the polarizing wheel, the two polarizing areas are respectively a vertical polarizing area and a horizontal polarizing area, the vertical polarizing area and the horizontal polarizing area are respectively divided into a plurality of sectors with the same size, a polarizing film is arranged on the surface of each sector, the polarizing direction of the polarizing film in the vertical polarizing area is parallel to the chord of the sector, the polarizing direction of the polarizing film in the horizontal polarizing area is perpendicular to the chord of the sector, the rotating speed of the polarizing wheel is half of that of the color wheel, after the polarizing wheel rotates one polarizing area, the color wheel synchronously rotates three color areas, so that after an image passes one frame, the polarizing wheel can just rotate one polarizing area, namely, the polarization direction is changed once, and the intersection point of the central line of the projection light path and the polarization wheel and the axis of the polarization wheel are at the same horizontal height;
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.
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 projector system with an invisible prompting function includes 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 view of a polarizing wheel according to an embodiment of the 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 polarizing glasses according to an embodiment of the 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; 6-lens; 7-a polarizing wheel; 71-vertically polarized regions; 72-horizontal polarization region; 8-subtitle data generating module; 9-a video data generation module; 10-a subtitle superposition module; 51-digital micromirror drive module; 11-polarized glasses; 12-a polarization region; 13-a non-polarizing region; 14-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 projector system with invisible prompting function 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 lens 6, and further includes: the device comprises a polarization wheel 7, a caption data generation module 8, a video data generation module 9, a caption superposition module 10, a digital micromirror drive module 51 and polarization glasses 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 module 51, and the lens 6 all belong to a part of a conventional projector, and belong to the prior art, and are not described herein again.
The polarizing wheel 7 is arranged between the first converging mirror 2 and the color wheel 3, the polarizing wheel 7 and the color wheel 3 are coaxially arranged, an annular polarizing area is arranged on the outer side of the polarizing wheel 7, the annular polarizing area is divided into two polarizing areas along the diameter of the polarizing wheel 7, namely a vertical polarizing area 71 and a horizontal polarizing area 72, the vertical polarizing area 71 and the horizontal polarizing area 72 are respectively divided into a plurality of sectors with equal size, referring to fig. 2, a polarizing plate is arranged on the surface of each sector, the polarizing direction of the polarizing plate of the vertical polarizing area 71 is parallel to the chord of the sector, and the polarizing direction of the polarizing plate of the horizontal polarizing area 72 is perpendicular to the chord of the sector; when each sector rotates, the polarization direction deviates from the horizontal or vertical direction by a small amplitude, but the influence on the use effect is small, so that the larger the number of the sectors in each polarization area is, the smaller the deviation amplitude is, the better the polarization effect is, and for convenience of description, the sectors are defined as a vertical polarization area 71 and a horizontal polarization area 72; the light passing through the polarization wheel 7 is light in a single polarization direction, that is, the light generated by the light source forms vertically polarized light after passing through the vertically polarized region 71, and the light generated by the light source forms horizontally polarized light after passing through the horizontally polarized region 72. The rotating speed of the polarizing wheel 7 is half of that of the color wheel 3, after the polarizing wheel 7 rotates through one polarizing area, the color wheel 3 synchronously rotates through three color areas, so that after an image passes through one frame, the polarizing wheel 7 can just rotate through one polarizing area, namely, the polarizing direction is changed once, the intersection point of the central line of the projection light path and the polarizing wheel 7 is at the same horizontal height as the axis of the polarizing wheel 7, and thus, light projected onto the polarizing wheel 7 is just close to vertical to the polarizing plate of the sector in the polarizing area, namely, vertical polarized light or horizontal polarized light is just formed. The rotation driving mechanism of the polarization wheel 7 is the same as the driving mechanism of the color wheel 3 in the DLP projector, and is a known technology, and is not described herein again.
The caption data generation module 8 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 8 is known in the art and is not described herein.
The video data generating module 9 receives media signals, such as VGA, video and other media signals, transmitted from the 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 8 is equal to the resolution of the video data generated by the video data generating module 9, and the pixels of the two have a one-to-one correspondence relationship; the video data generating module 9 is a conventional module, is well known to those skilled in the art, and will not be described herein.
The subtitle data generating module 8 and the video data generating module 9 are respectively connected to the subtitle superimposing module 10, the subtitle superimposing module 10 is connected to the digital micromirror driving module 51, and the digital micromirror driving module 51 is connected to the digital micromirror 5, as shown in fig. 3; the subtitle data generating module 8 inputs the generated subtitle data into the subtitle superimposing module 10, the video data generating module 9 inputs the generated video data into the subtitle superimposing module 10, the subtitle superimposing module 10 processes the video data according to the subtitle data, superimposes the subtitle information onto the video data, transmits the video data superimposed with the subtitle information to the digital micromirror driving module 51, then drives the digital micromirror 5, and finally displays the picture containing the invisible subtitle information on the imaging plane 14.
Polarization glasses 11 through which caption data can be observed on an imaging plane 14; the polarization direction of the polarization glasses 11 is maintained vertical or horizontal.
Referring to fig. 5 and 6, the lens of the polarized glasses 11 is composed of a plurality of polarized areas 12 and unpolarized areas 13, in this embodiment, the polarized areas 12 are rectangular polarized blocks, the unpolarized areas 13 are rectangular blocks, and the rectangular polarized blocks of the polarized areas 12 are uniformly distributed in an interlaced manner with the rectangular blocks in the unpolarized areas 13, see fig. 5 and 6; the area of each polarized region 12 is less than 0.02 square millimeters and the transparency of the rectangular block of unpolarized regions 13 is high. By arranging the polarization areas 12 and the non-polarization areas 13 which are distributed in a staggered mode on the lenses of the polarization glasses 11, after a user wears the polarization glasses 11, the hidden prompting words can be observed on the imaging plane 14 through the polarization areas 12, but the hidden prompting words cannot be observed on the imaging plane 14 when the user passes through the non-polarization areas 13, but the transparency of the non-polarization areas 13 is higher, the non-polarization areas 13 are the same as common glasses or myopia glasses, and the purpose of arranging the polarization areas 12 and the non-polarization areas 13 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 11, the hidden cue words can be observed, and other people who do not wear the polarized glasses 11 can not find that the cue words exist on the imaging plane 14 at all.
The polarized glasses 11 can be formed by a polarized film and attached to ordinary glasses, and can be conveniently used by people who wear the glasses at ordinary times.
The projection principle of the projector system is as follows:
the light generated by the light source 1 is irradiated to the first converging mirror 2, and is converged after passing through the first converging mirror 2, and is converged to the surface of the color area of the color wheel 3, when the light is irradiated to the surface of the color wheel 3 through the first converging mirror 2, the light passes through the polarizing wheel 7, the light passing through the polarizing wheel 7 is light in a single polarization direction, that is, the light generated by the light source passes through the vertical polarization area 71 to form vertical polarized light, the light generated by the light source passes through the horizontal polarization area 72 to form horizontal polarized light, and when the polarizing wheel 7 rotates through one polarization area, the color wheel 3 synchronously rotates through three color areas, so that after an image passes through one frame, the polarizing wheel 7 just rotates through one polarization area, that is, the polarization direction changes once;
after passing through the color wheel 3, the light is diffused outwards from a convergence point to the second converging lens 4, and then passes through the second converging lens 4 and then irradiates the digital micromirror 5; the processed video data drives the digital micro-mirror 5 to reflect the image containing the invisible subtitles onto the lens 6, and the image is magnified and projected onto the imaging plane 14 through the lens 6, so that a projection area is formed on the imaging plane 14.
The video data processing method of the projector system with the invisible prompter function comprises the following steps:
firstly, inputting the caption data and the video data into the caption superposition module 10;
secondly, the caption superposition module 10 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 10 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 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. 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 8 is generally disposed in a computer outside the projector, and the computer is in signal connection with the caption superimposing module 10, 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 generation module receives PPT information transmitted by 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 8 is installed in the computer, caption data generated by the caption data generation module 8 is transmitted to the caption superposition module 10 through an HDMI or DVI port, and the caption resolution generated by the caption data generation module 8 is the same as the resolution of the video signals;
supposing that the caption is a pattern with a cross-shaped middle part, the data corresponding to a cross-shaped 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 10 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 is 40% gray; 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 step, 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 in a in figure 4), 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 in a figure 4 b), 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 that the image data of the 'ten' position seen by the common audience on the imaging plane 14 is the same as that before processing, 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;
because the actual brightness values of 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%, the actual brightness values are different from the brightness of 40% of non-cross stroke areas, and due to the action of the polarizing wheel 7, the light generated by the light source 1 passes through the horizontal polarizing area 72 to form horizontal polarized light, and passes through the vertical polarizing area 71 to form vertical polarized light; the rotating speed of the polarizing wheel 7 is half of the rotating speed of the color wheel 3, and after the polarizing wheel 7 rotates through one polarizing area, the color wheel 3 synchronously rotates through three color areas, so that after an image passes through one frame, the polarizing wheel 7 can just rotate through one polarizing area, namely, the polarizing direction is changed once; therefore, the processed light formed by the two adjacent frames is respectively horizontal polarized light and vertical polarized light;
the user can observe the caption image on the imaging plane 14 through the polarized glasses 11; when the polarization direction of the polarization glasses 11 is horizontal, the frames of the vertically polarized light on the imaging plane 14 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 14 after wearing the polarization glasses 11; when the polarization direction of the polarization glasses 11 is vertical, frames of horizontally polarized light on the imaging plane 14 are filtered out, frames of vertically polarized light are seen, and caption information formed by the frames of vertically polarized light can be seen on the imaging plane 14 after the polarization glasses 11 are worn; that is, after wearing the glasses, no matter whether the polarized glasses 11 are horizontal or vertical, only even frame or odd frame images can be observed on the imaging plane 14, and the subtitle can not be seen if the glasses are not worn, and one of the two adjacent frames, that is, the cross on the frame with the brightness value of 0 or the cross on the frame with the brightness value of 80%, is used. 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 used for multiple purposes, and the caption is hidden in the gray scale area, and the best effect is achieved when the gray scale value is 30% of the highest brightness, therefore, if the invisible prompting function is required, the prompting words are placed in the gray background area by preferably using the background with the gray scale of about 30% when designing courseware.
The caption data generation module 8 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 8 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 (2)
1. The video data processing method of the projector system with the invisible prompter function comprises a light source, 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:
the polarizing wheel is arranged between the first converging mirror and the color wheel, the polarizing wheel and the color wheel are coaxially arranged, an annular polarizing area is arranged on the outer side of the polarizing wheel, the annular polarizing area is divided into two polarizing areas along the diameter of the polarizing wheel, the two polarizing areas are respectively a vertical polarizing area and a horizontal polarizing area, the vertical polarizing area and the horizontal polarizing area are respectively divided into a plurality of sectors with the same size, a polarizing film is arranged on the surface of each sector, the polarizing direction of the polarizing film in the vertical polarizing area is parallel to the chord of the sector, the polarizing direction of the polarizing film in the horizontal polarizing area is perpendicular to the chord of the sector, the rotating speed of the polarizing wheel is half of that of the color wheel, after the polarizing wheel rotates one polarizing area, the color wheel synchronously rotates three color areas, so that after an image passes one frame, the polarizing wheel can just rotate one polarizing area, namely, the polarization direction is changed once, and the intersection point of the central line of the projection light path and the polarization wheel and the axis of the polarization wheel are at the same horizontal height;
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;
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;
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 = (current value- (bit depth maximum value-current value)), and the red, green, and blue color values corresponding to the next frame become bit depth maximum values;
and step three, taking the next frame as the current frame, and repeating the step two.
2. The method for processing video data of a projector system with an invisible prompting function according to 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.
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| CN202010435750.7A CN111556301B (en) | 2020-05-21 | 2020-05-21 | Projector system with invisible prompting function and video data processing method |
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| WO2002032149A2 (en) * | 2000-10-12 | 2002-04-18 | Reveo, Inc. | 3d projection system with a digital micromirror device |
| CN1998246A (en) * | 2004-05-07 | 2007-07-11 | 科巴尔特娱乐有限公司 | Stereoscopic television signal processing method, transmission system and viewer enhancements |
| CN107205165A (en) * | 2017-07-11 | 2017-09-26 | 成都德芯数字科技股份有限公司 | Picture and text stacking method and device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002032149A2 (en) * | 2000-10-12 | 2002-04-18 | Reveo, Inc. | 3d projection system with a digital micromirror device |
| CN1998246A (en) * | 2004-05-07 | 2007-07-11 | 科巴尔特娱乐有限公司 | Stereoscopic television signal processing method, transmission system and viewer enhancements |
| CN107205165A (en) * | 2017-07-11 | 2017-09-26 | 成都德芯数字科技股份有限公司 | Picture and text stacking method and device |
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