CN111683236B - Light-combining reflector invisible prompter projector system and data superposition processing method - Google Patents
Light-combining reflector invisible prompter projector system and data superposition processing method Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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- H04N21/4884—Data services, e.g. news ticker for displaying subtitles
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Abstract
The invention discloses a light-combining reflector invisible prompter projector system and a data superposition processing method, wherein the projector system comprises a projector, a caption superimposer, a caption computer and polarized glasses; the subtitle superimposer receives the video data and the subtitle data, then superimposes the two data to form video data containing the invisible subtitles, outputs the video data to a corresponding interface of a projector, and forms a projection area on an imaging plane through the projector; the invention has reasonable design and convenient use, can be used as a common projector, can realize the prompter function of a speaker and cannot influence the watching of audiences.
Description
Technical Field
The invention relates to the technical field of projectors, in particular to a light-combining reflector invisible prompter projector system and a data superposition 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, images or videos such as PPT (Power Point) are projected onto a screen by the projector, a speaker needs to explain in combination with the projected images or videos, 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 in the PPT, and at this time, if the content is not mature, some prompting materials are needed, and some people hold lecture prompter cards and the like, so that lecture effect is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a light-combining reflector invisible prompter projector system which is reasonable in design and convenient to use, can be used as a common projector, can realize the prompter function for a speaker and does not influence audiences.
In order to solve the technical problems, the technical scheme of the invention is as follows: a light-combined reflector invisible prompter projector system comprises a projector, a caption superimposer, a caption computer and polarized glasses;
the projector comprises a first converging mirror, a color wheel, a second converging mirror, a digital micromirror, a lens, a polarized light source, a light-combining reflector and a polarized light source controller;
the polarized light source comprises a vertical polarized light source and a horizontal polarized light source;
the light combining reflector is arranged on the front side of the first converging mirror and comprises a substrate, a triangular reflector array is arranged on the substrate, the triangular reflector is of a triangular prism structure, the cross section of the triangular prism structure is an isosceles triangle, two prismatic surfaces corresponding to the waist of the isosceles triangle are used as light reflecting surfaces, the bottom surface of the triangular reflector array is attached to the substrate, the two light reflecting surfaces of the triangular reflector are a left reflecting surface and a right reflecting surface respectively, and the included angle between the left reflecting surface and the bottom surface and the included angle between the right reflecting surface and the bottom surface are both 30 degrees; the three-edge reflector is vertically arranged, the vertex angle of the vertical polarized light source and the horizontal polarized light source face the first converging mirror, the vertical polarized light source and the horizontal polarized light source are respectively arranged in front of the left side and the right side of the three-edge reflector, the polarized light generated by the polarized light source on the left side is irradiated onto the left reflecting surface and then reflected onto the first converging mirror by the left reflecting surface, the polarized light generated by the polarized light source on the right side is irradiated onto the right reflecting surface and then reflected onto the first converging mirror by the right reflecting surface, and the included angles between the irradiation directions of the left polarized light source and the right polarized light source and the substrate are both 30 degrees;
the polarized light source controller is connected with the polarized light source and controls the vertical polarized light source and the horizontal polarized light source to alternately emit light, and the alternate time is synchronous with the frame switching of the color wheel, namely when the color wheel rotates three color areas, the vertical polarized light source is just switched to the horizontal polarized light source, or the horizontal polarized light source is just switched to the vertical polarized light source;
the caption superposition device comprises an HDMI input port, a VGA input port, a composite video input port, an RS-232 serial port, an HDMI output port, a VGA output port and a caption superposition module;
the caption superposition module receives video data transmitted from an HDMI input port, a VGA input port or a composite video input port and caption data from an RS-232 serial port, then carries out superposition processing on the two data to form video data containing invisible captions, and outputs the video data to a corresponding interface of the projector through an HDMI output port or a VGA output port;
the caption computer is connected with the caption superimposer through an RS-232 serial port and internally comprises a caption data generation module for generating caption data;
polarization glasses of which polarization directions are maintained vertical or horizontal.
Preferably, the polarized light source is a laser polarized light source.
As a preferable technical scheme, the lens of the polarized glasses is formed by interleaving polarized areas and non-polarized areas, and the area of each polarized area is less than 0.02 square millimeter.
As a preferred technical solution, a data superposition processing method for a light-combining reflector invisible cue projector system includes the steps of:
step one, the caption superimposer receives caption data transmitted by the caption computer and video data transmitted by an HDMI input port, a VGA input port or a composite video input port;
dividing video data into a subtitle stroke area, a subtitle background area and a non-subtitle area according to the position of subtitle data, wherein the subtitle stroke area is an area covered by subtitle strokes, the subtitle background area is an area formed by subtracting the subtitle stroke area from a rectangular area capable of covering the subtitle position, and the remaining area of an image is the non-subtitle area;
dividing the video data into odd frames and even frames, wherein the processing method of the video data of the current odd frames comprises the following steps: the pixel brightness value of the video data of the non-caption area is not changed; the pixel brightness value of the video data of the subtitle stroke area is increased by 10-30%; the pixel brightness value of the video data of the corresponding subtitle background area is reduced by 10-15%;
the processing method of the video data of the even frame after the current odd frame comprises the following steps: the pixel brightness value of the video data of the non-caption area is not changed; subtracting the brightness value increased by the corresponding pixels of the odd frames from the pixel brightness value of the video data of the caption stroke area on the basis of the original brightness value; the brightness value of the pixel of the video data of the corresponding caption background area is increased by the reduced brightness value of the pixel corresponding to the odd frame on the basis of the original brightness value;
and step four, taking the next odd frame as the current odd frame, repeating the step three, and sequentially processing the following odd frame and even frame.
As a preferred technical solution, the current processing method of video data of odd frames is as follows: the pixel brightness value of the video data of the non-caption area is not changed; the pixel brightness value of the video data of the caption pen-drawing area is increased by 10-30%, and the pixel brightness value of the video data of the corresponding caption background area is decreased by 10-15%;
if the current pixel brightness value of the video data in the caption stroke area plus the increased brightness value is greater than the maximum brightness value represented by the video pixel bit depth, then: if the current brightness value plus the added value is larger than the maximum brightness value, the pixel brightness value of the video data in the current odd frame subtitle stroke area is increased to the maximum brightness value;
if the absolute value of the current pixel brightness value plus the reduced brightness value of the video data of the caption background area is greater than the maximum brightness value represented by the video pixel bit depth, then: when the current luminance value + | reduction value | > is greater than the maximum luminance value, the pixel luminance value of the video data in the subtitle background region is reduced to the difference between the current luminance value minus the maximum luminance value and the current luminance value, that is, the pixel luminance value of the video data in the subtitle background region of the current odd frame is equal to (current luminance value- (maximum luminance value-current luminance value)).
As a preferred technical scheme, the following components are added in the third step: the caption superposition module compares the data of the odd frame and the even frame after the odd frame, 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 pixel bit depth of the video data, the brightness increase and decrease processing is not carried out on the current odd frame and the even frame after the current odd frame, the comparison between the next odd frame and the even frame after the current odd frame is continued, otherwise, the next step is carried out.
As a preferred technical solution, the pixel brightness value processing method is: firstly, converting an RGB color mode corresponding to video data into an HSI mode, namely converting three numerical values of red, green and blue colors corresponding to the video data into three numerical values of hue, saturation and brightness, then independently increasing and decreasing the brightness numerical value, and then converting the processed HSI value into an RGB value.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: the subtitle superimposer receives the video data and the subtitle data, then superimposes the two data to form video data containing the invisible subtitles, outputs the video data to a corresponding interface of a projector, and forms a projection area on an imaging plane through the projector; after the polarized glasses are worn, hidden subtitles can be observed on an imaging plane, but audiences without the polarized glasses cannot observe the hidden subtitles on the imaging plane, the video data on the imaging plane under the visual angle of the audiences has the same effect as that projected by a common projector, and the display contrast of the hidden subtitles can be improved by a reverse processing method of a subtitle background area and a subtitle stroke area; 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 the watching of 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 projector according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a light combining mirror according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a light combining mirror according to an embodiment of the present invention;
FIG. 5 is a perspective view of a light combining mirror according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a superposition processing method according to an embodiment of the present invention;
FIG. 7 is a schematic view of polarizing glasses according to an embodiment of the invention;
FIG. 8 is an enlarged schematic view at I of FIG. 7;
in the figure: 100-a projector; 110-a first converging mirror; 120-a color wheel; 130-a second converging mirror; 140-digital micromirror; 150-lens; 161-vertically polarized light source; 162-a horizontally polarized light source; 170-a light-combining mirror; 171-a substrate; 172-three-edged reflector; 173-left reflecting surface; 174-right reflective surface; 180-polarized light source controller; 200-a subtitle superimposer; 201-HDMI input port; 202-VGA input port; 203-composite video input port; 204-RS-232 serial port; 205-HDMI output port; 206-VGA output port; 300-caption computer; 400-polarized glasses; 401-a polarization region; 402-a non-polarizing region; 500-imaging plane; 600-subtitle stroke area; 700-subtitle background region; 800-non-subtitle 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 and 7, a light-combining reflector contact prompter projector system includes a projector 100, a caption superimposer 200, a caption computer 300 and polarized glasses 400, wherein the caption computer 300 is connected with the caption superimposer 200, and the caption superimposer 200 is connected with the projector 100; the caption computer 300 is configured to generate caption data and transmit the caption data to the caption superimposer 200, and the caption superimposer 200 performs data superimposition processing to superimpose the caption data and the video data together, so that the video projected onto the imaging plane 500 has hidden captions, and after wearing the polarization glasses 400, the captions can be seen on the imaging plane 500, but the polarization glasses 400 are not worn, and only normal video or images can be seen on the imaging plane 500.
Referring to fig. 2, the projector 100 includes a first collecting mirror 110, a color wheel 120, a second collecting mirror 130, a digital micromirror 140, a lens 150, a polarized light source, a light combining mirror 170, and a polarized light source controller 180, wherein the first collecting mirror 110, the color wheel 120, the second collecting mirror 130, the digital micromirror 140, and the lens 150 all belong to a part of the existing projector 100, and the structure and the installation position thereof all belong to the prior art, and are not described herein again.
Referring to fig. 3, the polarized light source includes a vertically polarized light source 161 and a horizontally polarized light source 162; the vertical polarized light source 161 is configured to generate vertical polarized light, the horizontal polarized light source 162 is configured to generate horizontal polarized light, the vertical polarized light source 161 and the horizontal polarized light source 162 may employ a laser polarized light source or an LED light source plus a polarizer, both of the two light sources have the characteristic of fast response speed, which is convenient for control and switching, both of which are prior art, and are not described herein again. Furthermore, the polarized light source is a laser polarized light source, and by adopting the polarized light source, a polarizer is not needed, so that the light intensity cannot be attenuated in the transmission process of the light.
Referring to fig. 3 to 5, the light combining reflector 170 is disposed on the front side of the first converging mirror 110, the light combining reflector 170 includes a substrate 171, a triangular reflector array is disposed on the substrate 171, that is, a plurality of triangular reflectors 172 are disposed on the substrate 171 and arranged in an array, in this embodiment, the substrate 171 and the triangular reflectors 172 are in an integrally formed structure, the triangular reflectors 172 are in a triangular prism structure, the cross section of the triangular prism structure is an isosceles triangle, two prism surfaces corresponding to the waist of the isosceles triangle are used as light reflecting surfaces, the bottom surface is attached to the substrate 171, the two light reflecting surfaces of the triangular reflectors 172 are respectively a left reflecting surface 173 and a right reflecting surface 174, the included angles between the left reflecting surface 173 and the right reflecting surface 174 and the bottom surface are both 30 °, and the included angle between the left reflecting surface 173 and the right reflecting surface 174 is 120 °; the triangular reflector 172 is vertically arranged, and the vertex angle of the triangular reflector faces the first converging lens 110; the vertical polarized light source 161 and the horizontal polarized light source 162 are respectively disposed in front of the left and right sides of the triangular reflector 172, polarized light generated by the polarized light source located on the left side is reflected by the left reflecting surface 173 onto the first collecting mirror 110 after being irradiated onto the left reflecting surface 173, and polarized light generated by the polarized light source located on the right side is reflected by the right reflecting surface 174 onto the first collecting mirror 110 after being irradiated onto the right reflecting surface 174; in this embodiment, the vertical polarized light source 161 is disposed in front of the left side of the triangular reflector 172, and the horizontal polarized light source 162 is disposed in front of the right side of the triangular reflector 172; the vertical polarized light generated by the vertical polarized light source 161 forms an angle of 30 ° with the substrate 171, that is, the vertical polarized light is parallel to the right reflective surface 174, so that the vertical polarized light can directly irradiate onto the left reflective surface 173, and the horizontal polarized light generated by the horizontal polarized light source 162 forms an angle of 30 ° with the substrate 171, that is, the horizontal polarized light is parallel to the left reflective surface 173, so that the horizontal polarized light can directly irradiate onto the right reflective surface 174; by left side plane of reflection 173 with contained angle between right plane of reflection 174 and the bottom surface is 30, consequently, shine to with 30 angle on the left side when vertical polarization light in the left side back on the plane of reflection 173, the refraction takes place for the light path, with it shines to send 90 between the base plate 171 on the first convergent mirror 110, shine to with 30 angle on the right side back on the plane of reflection 174, the refraction takes place for the light path, with it shines to be 90 between the base plate 171 on the first convergent mirror 110. The greater the number of the triangular reflectors 172, the better the uniformity of the reflected light, which is better than the horizontal resolution of the digital micromirror 140.
Referring to fig. 2, the polarized light source controller 180 is connected to the polarized light source, and controls the vertical polarized light source 161 and the horizontal polarized light source 162 to emit light alternately, and the alternate time is synchronized with the frame switching of the color wheel 120, that is, when the color wheel 120 rotates through three color zones, the vertical polarized light source 161 is switched to the horizontal polarized light source 162, or the horizontal polarized light source 162 is switched to the vertical polarized light source 161. Due to the design of the polarized light source controller 180, the vertical polarized light source 161 and the horizontal polarized light source 162 emit light alternately, that is, the vertical polarized light and the horizontal polarized light are emitted to the first collecting mirror 110 alternately through the light combining mirror 170, and the time of the two light sources is synchronous with the frame switching of the color wheel 120, so that two adjacent frames rotated by the color wheel 120 are the horizontal polarized light and the vertical polarized light respectively, 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. 1, the caption superimposer 200 includes an HDMI input port 201, a VGA input port 202, a composite video input port 203, an RS-232 serial port 204, an HDMI output port 205, a VGA output port 206, and a caption superimposing module.
The caption superimposing module 207 receives video data transmitted from the HDMI input port 201, the VGA input port 202, or the composite video input port 203, and caption data from the RS-232 serial port 204, and then superimposes the two data to form video data containing hidden captions, and outputs the video data to a corresponding interface of the projector 100 through the HDMI output port 205 or the VGA output port 206.
Referring to fig. 1, a caption computer 300 is connected to the caption superimposer 200 through an RS-232 serial port 204, and the caption computer 300 includes a caption data generation module for generating caption data. The caption computer 300 has the functions of controlling the display and non-display of the captions, and the caption switching function, which are the prior art, and are not described herein again.
The polarization direction of the polarization glasses 400 is maintained vertical or horizontal. The polarized glasses 400 can be formed by attaching a polarized film to ordinary glasses, and can be conveniently used by people who wear the glasses at ordinary times. When the user wears the polarized glasses 400, the closed captions can be observed, and other people who do not wear the polarized glasses 400 can not find the captions on the imaging plane 500 at all.
Referring to fig. 7 and 8, the lens of the polarized glasses 400 is composed of a plurality of polarized areas 401 and non-polarized areas 402 in an interlaced manner, in this embodiment, the polarized areas 401 are rectangular polarized blocks, the non-polarized areas 402 are rectangular blocks, and the rectangular polarized blocks of the polarized areas 401 are uniformly distributed in the non-polarized areas 402 in an interlaced manner, see fig. 7 and 8; the area of each polarized region 401 is less than 0.02 square millimeters and the transparency of the rectangular block of unpolarized regions 402 is high. By arranging the polarization areas 401 and the non-polarization areas 402 on the lenses of the polarization glasses 400 in a staggered manner, after the user wears the polarization glasses 400, the user can observe hidden prompts on the imaging plane 500 through the polarization areas 401, but cannot observe the hidden prompts on the imaging plane 500 through the non-polarization areas 402, but the non-polarization areas 402 have higher transparency, the non-polarization areas 402 are the same as common glasses or myopia glasses, and the purpose of arranging the polarization areas 401 and the non-polarization areas 402 in a staggered manner is to improve the transparency of the glasses, so that although the contrast of hidden subtitles is reduced to a certain extent, the viewing of the subtitles is not affected. After the user wears the polarized glasses 400, the hidden cue words can be observed, and other people who do not wear the polarized glasses 400 can not find that the cue words exist on the imaging plane 500 at all.
The projection principle of the projector 100 system is as follows:
the light generated by the polarized light source passes through the light-combining reflector 170, then irradiates to the first converging lens 110, converges after passing through the first converging lens 110, and converges to the color area surface of the color wheel 120, and the light passes through the color wheel 120, then diverges outwards from a converging point to the second converging lens 130, passes through the second converging lens 130, and then irradiates to the digital micromirror 140; the digital micromirror 140 reflects the video containing the closed caption onto the lens 150, and then projects the video onto the imaging plane 500 through the lens 150 in an enlarged manner, so as to form a projection area on the imaging plane 500.
A data superposition processing method of a light-combining reflector 170 invisible hint projector 100 system comprises the following steps:
step one, the caption superimposer 200 receives caption data transmitted from the caption computer 300 and video data transmitted from an HDMI input port 201, a VGA input port 202 or a composite video input port 203, see a) and b) in fig. 6;
dividing video data into a subtitle stroke area 600, a subtitle background area 700 and a non-subtitle area 800 according to the position of subtitle data, wherein the subtitle stroke area 600 is an area covered by subtitle strokes, the subtitle background area 700 is an area formed by subtracting the subtitle stroke area from a rectangular area capable of covering subtitle positions, and the remaining area of an image is the non-subtitle area 800, which is shown in fig. 6 c);
dividing the video data into odd frames and even frames, wherein the processing method of the video data of the current odd frames comprises the following steps: the pixel brightness value of the video data of the non-subtitle area 800 is not changed; the pixel brightness value of the video data of the subtitle stroke area 600 is increased by 10-30%; the pixel brightness value of the video data of the corresponding subtitle background region 700 is reduced by 10-15%; the processing method of the video data of the even frame after the current odd frame comprises the following steps: the pixel brightness value of the video data of the non-subtitle area 800 is not changed; the pixel brightness value of the video data of the subtitle stroke area 600 is subtracted by the brightness value added by the corresponding pixel of the odd frame on the basis of the original brightness value; the brightness value of the pixel of the video data in the corresponding subtitle background region 700 is increased by the decreased brightness value of the pixel corresponding to the odd frame based on the original brightness value;
at this time, because the increasing and decreasing values of the corresponding areas of the two adjacent previous and next frames are the same, the visual effect is the same as that of the non-processed area due to the persistence of vision effect of human eyes, so that the viewer cannot see the subtitles superimposed on the video, for example, when the luminance value of the video pixel is 50%, the luminance value of the pixel of the video data in the current odd-frame subtitle stroke area 600 is 60% after increasing 20%, and the luminance value of the pixel of the video data corresponding to the even-frame subtitle stroke area 600 is 40% after decreasing 20%, and because the increasing and decreasing values of the corresponding areas of the adjacent previous and next frames are the same, the viewer cannot observe the subtitles on the imaging plane 500; similarly, when the pixel brightness value of the video data in the subtitle stroke area 600 of the current odd frame is increased, the pixel brightness value of the video data in the subtitle background area 700 corresponding to the current odd frame is decreased by 10%, the pixel brightness value of the video data in the subtitle background area 700 corresponding to the even frame is increased by 10%, and the increase and decrease values of the corresponding areas of the odd frame and the even frame are the same, so as to ensure that the viewer cannot observe the subtitle on the imaging plane 500; however, when the pixel brightness value of the subtitle stroke area 600 of the current odd frame is increased, the pixel brightness value of the subtitle background area 700 corresponding to the odd frame is decreased, and when the pixel brightness value of the subtitle stroke area 600 of the corresponding even frame is decreased, the brightness value of the subtitle background area 700 corresponding to the even frame is increased, such an increase-decrease or a decrease-increase between the subtitle stroke area 600 and the subtitle background area 700 is to make the difference between the pixel brightness values of the subtitle stroke area 600 and the subtitle background area 700 large, increase the contrast and the definition of the subtitle, and further highlight the subtitle data in the subtitle stroke area 600, see d) in fig. 6 as an effect map of a certain frame after data superposition processing;
and step four, taking the next odd frame as the current odd frame, repeating the step three, and sequentially processing the following odd frame and even frame.
The method for processing the video data of the current odd frame is added in the third step and comprises the following steps: the pixel brightness value of the video data of the non-subtitle area 800 is not changed; the pixel brightness value of the video data in the subtitle stroke area 600 is increased by 10-30%, and the pixel brightness value of the video data in the corresponding subtitle background area 700 is decreased by 10-15%;
if the current pixel brightness value plus the increased brightness value of the video data of the subtitle stroke area 600 is greater than the maximum brightness value represented by the video pixel bit depth, then: if the current brightness value + added value > the maximum brightness value, the pixel brightness value of the video data of the current odd-frame subtitle stroke area 600 is increased to the maximum brightness value;
if the absolute value of the current pixel brightness value plus the reduced brightness value of the video data in the caption background area 700 is greater than the maximum brightness value represented by the video pixel bit depth, then: when the current luminance value + | reduction value | > is greater than the maximum luminance value, the pixel luminance value of the video data in the subtitle background region 700 is reduced to the difference between the current luminance value minus the maximum luminance value and the current luminance value, i.e., the pixel luminance value of the video data in the subtitle background region 700 of the current odd frame is equal to (current luminance value- (maximum luminance value-current luminance value)). By adding this step, it is used to process the situation that the brightness value of the pixel of the video data is greater than the maximum brightness value represented by the bit depth of the video pixel after adding the added value. By the above improvement, the range of the hidden subtitle superimposition can be increased.
The broadcast PPT is the most commonly used mode of the projector 100, and the data superposition 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 caption superimposing module 207 of the caption superimposer 200 receives the PPT information transmitted from the computer through the VGA input port 202, converts the PPT signal to generate video data that meets the resolution and frame frequency of the projector 100, and transmits the caption data generated by the caption computer 300 to the caption superimposing module 207 through the RS-232 serial port 204, where the resolution of the caption data generated by the caption computer 300 is the same as the resolution of the video data, see a) and b in fig. 6);
assuming that the caption of the cue word is a pattern of three 'T' words, the brightness value of the pixel of the video image is a gray image which is 40% of the highest brightness value; the caption superimposing module 207 divides the corresponding position of the video data into three regions, namely a caption stroke region 600, a caption background region 700 and a non-caption region 800, according to the patterns of the three T words of the caption data, wherein the caption stroke region 600 is a region covered by the patterns of the three T words, the caption background region 700 is a region formed by subtracting the caption stroke region from a rectangular region corresponding to the patterns of the three T words, and the other regions outside the rectangle are non-caption regions 800, which is shown in c in fig. 6);
the brightness value of the pixels of the subtitle stroke area 600 of the odd frame of the video data is increased by 52% after 30%, namely, the luminance value of the pixels of the corresponding region of the three "T" patterns is 52% of the highest luminance value, the luminance value of the pixels of the subtitle background region 700 of the odd frame of the video data is reduced by 15% to 34%, the luminance value of the pixels of the rectangular region outside the three "T" patterns is 34% of the highest luminance value, the luminance value of the pixels of the non-subtitle stroke region 600 of the video data is still 40% without change, i.e. the brightness value of the pixels in the other regions outside the rectangular region is 40% of the highest brightness value, see d in fig. 6), at this time, the difference between the brightness values of the three "T" regions and the brightness value of the rectangular region outside is obvious, the brightness value of the pixels in the subtitle stroke region 600 and the subtitle background region 700 increases and decreases, the contrast and the definition of the subtitle are increased, the subtitle stroke area 600 can be seen only by adjusting the pixel brightness value of the video data to a small value;
the brightness value of the pixels in the subtitle stroke area 600 of the even frame of the video data is reduced by 28% after 30%, that is, the brightness value of the pixels in the corresponding area of the three "T" words is 28% of the highest brightness value, the brightness value of the pixels in the subtitle background area 700 of the even frame of the video data is increased by 15% and is 46%, the brightness value of the pixels in the rectangular area outside the three "T" words is 46% of the highest brightness value, the brightness value of the pixels in the non-subtitle stroke area 600 of the video data is not changed and is still 40%, that is, the brightness value of the pixels in the other area outside the rectangular area is 40% of the highest brightness value, the increased and reduced brightness values of two adjacent frames are the same, due to the persistence of vision effect of human eyes, the visual effect is the same as that of the video data which is not processed, the frame frequency of the projector 100 is basically over 60 frames at present, so that no stroboscopic effect exists, so that the video data of the three "T" word positions seen by the common viewer through the imaging plane 500 is the same as that of the video data before being processed, the visual perception brightness value is still 40%; therefore, the video and the image seen by the common audience are the same as those before the caption is added, and no change is caused;
because the actual brightness values of the two processed frames at the three T-shaped positions are different, the actual brightness values are different from the brightness of 40% of the non-caption stroke area 600, and because the light combining reflector 170 is controlled by the polarized light source controller 180, the two adjacent frames are respectively horizontal polarized light and vertical polarized light, namely, the even frames are horizontal polarized light, the odd frames are vertical polarized light, or the even frames are vertical polarized light, and the even frames are horizontal polarized light;
the user can observe the subtitles on the imaging plane 500 through the polarized glasses 400; when the polarization direction of the polarization glasses 400 is horizontal, the frames of the vertically polarized light on the imaging plane 500 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 500 after wearing the polarization glasses 400; when the polarization direction of the polarization glasses 400 is vertical, frames of horizontally polarized light on the imaging plane 500 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 500 after wearing the polarization glasses 400; that is, after wearing the glasses, even frames or odd frames of video can be observed on the imaging plane 500 regardless of whether the polarized glasses 400 are horizontal or vertical, and the subtitles are not seen without wearing the glasses. The invention can be used as a common projector 100, 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, 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 to be used, the background with the gray scale of about 30% is preferably used when designing courseware, and the prompting word, namely the invisible caption is placed in the gray background area.
Adding the following components in the third step: the caption superimposing module 207 compares the data signals of the odd video frame and the even video frame, 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 represented by the pixel bit depth of the video data, the brightness increase and decrease processing is not performed on the current odd frame and the even video frame behind the current odd frame, the comparison between the next odd video frame and the even video frame behind the current odd frame is continued, otherwise, the next step is performed. Therefore, the defect that the original three-step processing method cannot realize complete complementation of the front frame and the rear frame when the brightness difference of the front frame and the rear frame of the video is large can be overcome, and the watching effect is improved.
The pixel brightness value processing method comprises the following steps: firstly, converting an RGB color mode corresponding to video data into an HSI mode, namely converting three numerical values of red, green and blue colors corresponding to the video data into three numerical values of hue, saturation and brightness, then independently increasing and decreasing the brightness numerical value, and then converting the processed HSI value into an RGB value. After the RGB value is converted into the HSI value, the brightness value is independently adjusted, so that the brightness value is increased and decreased more clearly, if the RGB value is directly adjusted, the red, green and blue color values need to be adjusted, the data operation is complex, the value adjustment is not visual, and when the HSI value is adjusted, only the brightness value is adjusted. The conversion method between the RGB color mode and the HSI mode is prior art and will not be described 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 (6)
1. A data superposition processing method of a light-combining reflector invisible prompter projector system is characterized in that the projector system comprises a projector, a caption superimposer, a caption computer and polarization glasses;
the projector comprises a first converging mirror, a color wheel, a second converging mirror, a digital micromirror, a lens, a polarized light source, a light-combining reflector and a polarized light source controller;
the polarized light source comprises a vertical polarized light source and a horizontal polarized light source;
the light combining reflector is arranged on the front side of the first converging mirror and comprises a substrate, a triangular reflector array is arranged on the substrate, the triangular reflector is of a triangular prism structure, the cross section of the triangular prism structure is an isosceles triangle, two prismatic surfaces corresponding to the waist of the isosceles triangle are used as light reflecting surfaces, the bottom surface of the triangular reflector array is attached to the substrate, the two light reflecting surfaces of the triangular reflector are a left reflecting surface and a right reflecting surface respectively, and the included angle between the left reflecting surface and the bottom surface and the included angle between the right reflecting surface and the bottom surface are both 30 degrees; the three-edge reflector is vertically arranged, the vertex angle of the vertical polarized light source and the horizontal polarized light source face the first converging mirror, the vertical polarized light source and the horizontal polarized light source are respectively arranged in front of the left side and the right side of the three-edge reflector, the polarized light generated by the polarized light source on the left side is irradiated onto the left reflecting surface and then reflected onto the first converging mirror by the left reflecting surface, the polarized light generated by the polarized light source on the right side is irradiated onto the right reflecting surface and then reflected onto the first converging mirror by the right reflecting surface, and the included angles between the irradiation directions of the left polarized light source and the right polarized light source and the substrate are both 30 degrees;
the polarized light source controller is connected with the polarized light source and controls the vertical polarized light source and the horizontal polarized light source to alternately emit light, and the alternate time is synchronous with the frame switching of the color wheel, namely when the color wheel rotates three color areas, the vertical polarized light source is just switched to the horizontal polarized light source, or the horizontal polarized light source is just switched to the vertical polarized light source;
the caption superposition device comprises an HDMI input port, a VGA input port, a composite video input port, an RS-232 serial port, an HDMI output port, a VGA output port and a caption superposition module;
the caption superposition module receives video data transmitted from an HDMI input port, a VGA input port or a composite video input port and caption data from an RS-232 serial port, then carries out superposition processing on the two data to form video data containing invisible captions, and outputs the video data to a corresponding interface of the projector through an HDMI output port or a VGA output port;
the caption computer is connected with the caption superimposer through an RS-232 serial port and internally comprises a caption data generation module for generating caption data;
polarization glasses of which polarization directions are maintained vertical or horizontal;
the data superposition processing method comprises the following steps:
step one, the caption superimposer receives caption data transmitted by the caption computer and video data transmitted by an HDMI input port, a VGA input port or a composite video input port;
dividing video data into a subtitle stroke area, a subtitle background area and a non-subtitle area according to the position of subtitle data, wherein the subtitle stroke area is an area covered by subtitle strokes, the subtitle background area is an area formed by subtracting the subtitle stroke area from a rectangular area capable of covering the subtitle position, and the remaining area of an image is the non-subtitle area;
dividing the video data into odd frames and even frames, wherein the processing method of the video data of the current odd frames comprises the following steps: the pixel brightness value of the video data of the non-caption area is not changed; the pixel brightness value of the video data of the subtitle stroke area is increased by 10-30%; the pixel brightness value of the video data of the corresponding subtitle background area is reduced by 10-15%;
the processing method of the video data of the even frame after the current odd frame comprises the following steps: the pixel brightness value of the video data of the non-caption area is not changed; subtracting the brightness value increased by the corresponding pixels of the odd frames from the pixel brightness value of the video data of the caption stroke area on the basis of the original brightness value; the brightness value of the pixel of the video data of the corresponding caption background area is increased by the reduced brightness value of the pixel corresponding to the odd frame on the basis of the original brightness value;
and step four, taking the next odd frame as the current odd frame, repeating the step three, and sequentially processing the following odd frame and even frame.
2. The data superposition processing method for the light-combining reflector invisible cue projector system as claimed in claim 1, wherein: the polarized light source is a laser polarized light source.
3. The data superposition processing method for the light-combining reflector invisible cue projector system as claimed in claim 1, wherein: the lens of the polarized glasses is composed of polarized areas and non-polarized areas in an interlaced mode, and the area of each polarized area is smaller than 0.02 square millimeter.
4. The data superposition processing method for the light-combining reflector invisible cue projector system as claimed in claim 1, wherein: the current processing method for video data of odd frames further comprises the following steps: if the current pixel brightness value plus the increased brightness value of the video data of the caption stroke area is greater than the maximum brightness value represented by the video pixel bit depth, then: if the current brightness value plus the added value is larger than the maximum brightness value, the pixel brightness value of the video data in the current odd frame subtitle stroke area is increased to the maximum brightness value;
if the absolute value of the current pixel brightness value plus the reduced brightness value of the video data of the caption background area is greater than the maximum brightness value represented by the video pixel bit depth, then: when the current luminance value + | reduction value | > is greater than the maximum luminance value, the pixel luminance value of the video data in the subtitle background region is reduced to the difference between the current luminance value minus the maximum luminance value and the current luminance value, that is, the pixel luminance value = (current luminance value- (maximum luminance value-current luminance value)) of the video data in the subtitle background region in the current odd frame.
5. The data superposition processing method for the light-combining reflector invisible cue projector system as claimed in claim 4, wherein: adding the following components in the third step: the caption superposition module compares the data of the current odd frame and the even frame behind the current odd frame, if the average value of the difference of the pixel brightness values corresponding to the two frames is more than 5% of the maximum brightness value which can be expressed by the pixel bit depth of the video data, the brightness increase and decrease processing is not carried out on the current odd frame and the even frame behind the current odd frame, the comparison between the next odd frame and the even frame behind the current odd frame is continued, otherwise, the next step is carried out.
6. The data superposition processing method for the light-combining reflector hidden prompter projector system as claimed in any one of claims 1 to 5, wherein: the pixel brightness value processing method comprises the following steps: firstly, converting an RGB color mode corresponding to video data into an HSI mode, namely converting three numerical values of red, green and blue colors corresponding to the video data into three numerical values of hue, saturation and brightness, then independently increasing and decreasing the brightness numerical value, and then converting the processed HSI value into an RGB value.
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| CN202010735490.5A Active CN111683236B (en) | 2020-03-11 | 2020-07-28 | Light-combining reflector invisible prompter projector system and data superposition processing method |
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| CN111683236A (en) | 2020-09-18 |
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