CN101482690B - Self-adapting template big-screen brightness emendation method with multi-projector combined display - Google Patents
Self-adapting template big-screen brightness emendation method with multi-projector combined display Download PDFInfo
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Abstract
A method for correcting self-adapting formwork large-screen brightness displayed in combination by multiple projectors belongs to the large-screen image display field, characterized in that, the method comprises: generating a formwork; obtaining the attenuated image by multiplying the brightness value of the original image in the computer and the value in the formwork; then eliminating the high bright band in a stacked area by the mode of outputting the image to the projector. The invention provides a plurality of generated formworks in advance for the images with different brightness to select a formwork with optimum effect. The invention can self-adapting select the appropriate formwork to perform the brightness correction according to the real-time allocated brightness values of the sub images of each projector, thereby the images with various brightness all can obtain better brightness correcting effects.
Description
Technical field
The present invention relates to the gamma correction that the multi-projector combination shows, realize that the large-screen high-resolution that the multi-projector combination shows shows.
Background technology
The gamma correction that existing multi-projector large-screen splicing shows, all be with many projecting apparatus big picture of tiled display on large-screen, between the adjacent projecting apparatus overlapping region is arranged, just Dui Ying projected image has overlapping region, can eliminate the bright band of overlapping region by the method for software or hardware, realize the seamless spliced demonstration of multi-projector large-screen.
Hardware approach is to utilize shadow shield to cover the unnecessary light of projecting apparatus, makes and has only the luminous energy projection of a projecting apparatus to go at overlapping region, and the light of other projecting apparatus all is blocked.Can leak with regard to any light in the place that the benefit of this method is covered yet.Shortcoming is manually to control the position of shadow shield, wastes time and energy, and is inapplicable for the combination of a lot of projecting apparatus.
Software approach is to change by the brightness to projector image in frame buffer, reaches the brightness unanimity.Existing software approach mainly contains that the edge merges, three kinds of methods of brightness feedback are made peace in brightness one.
The edge merges function of employing and as template transition processing is carried out in the overlapping region of projecting apparatus.This function has plenty of linear function, has plenty of cosine function, has plenty of power function.The advantage of this method is simple, is easy to calculate; Shortcoming is to adopt which kind of function all can not make the overlay region transition of all images even.
The brightness consistent method is a Luminance Distribution of at first obtaining each projecting apparatus display white image with camera respectively, calculates the brightness of overlapping region, and promptly each projecting apparatus is in the brightness sum of this position; Secondly, each projecting apparatus generates an illuminometer LAM, and the value of every bit is Lmin/L in the illuminometer, and wherein, Lmin is the minimum brightness of all projecting apparatus, and L is the intrinsic brilliance of this point; At last, the every width of cloth image in the frame buffer all be multiply by the template factor in the illuminometer, export again, thereby reach the purpose of gamma correction.Because the brightness response curve of hypothesis projecting apparatus is linear in this method, and in fact the brightness response curve of projecting apparatus is non-linear, so carried out gamma correction again.Gamma correction is exactly the brightness response curve that obtains projecting apparatus, makes the brightness look-up table with its inverse function, before projecting apparatus output, tables look-up earlier, output again.Brightness response curve can generate with the output that the brightness instrument obtains each brightness of projection, also can use the HDR method, promptly obtains the brightness response curve of projecting apparatus with digital camera.The advantage of brightness consistent method is the brightness unanimity that obtains whole screen in theory; Shortcoming one is to use relatively costliness of brightness instrument, and will measure 255 brightness of each projecting apparatus, wastes time and energy; Shortcoming two be whole projection screen for the output with minimum is consistent, the brightness of entire image is diminished, wasted a lot of brightness ranges; Shortcoming three is that the brightness of this method hypothesis overlapping region is that the brightness sum of each projecting apparatus, the brightness that camera obtains are real and uniform, but these all are invalid.
The method of brightness feedback is the image that obtains according to camera and the template factor of relatively revising image of reference picture, crosses brightly then to reduce, and crosses blackly then to increase.The generation of reference picture, the camera image of the direct usefulness of non-overlapping region, overlapping region obtains by non-overlapping region linear interpolation.By repeatedly feed back the template of brightness even transition to the end.The advantage of this method is the even transition that obtains brightness in theory.Shortcoming is that the clean influence of spending of the smoothness of camera subject error, surround lighting, screen is very big.
Summary of the invention
The objective of the invention is to eliminate the bright band that the multi-projector combination shows overlapping region, realize that the seamless spliced large-screen high-resolution of multi-projector shows.
The invention is characterized in, contain following step successively:
Step (1): initialization;
Step (1.1): set up a rectangular coordinate system for described large-screen, initial point is in the lower left corner of this screen;
Step (1.2): form a projecting apparatus matrix with m * n DLP projecting apparatus, m is row, and n is row; Per two described DLP projecting apparatus are controlled with a client computer;
Step (1.3): the image that described each client computer is formed the equally spaced characteristic point of equally distributed 8 row, 8 row in each projecting apparatus space outputs to respectively in the DLP projecting apparatus of oneself controlling, the output of described each DLP projecting apparatus is taken pictures respectively in identical position with digital camera, obtain the characteristic point image of described each DLP projecting apparatus at screen space;
Step (1.4): server carries out image processing to described each characteristic point image of screen space and obtains the characteristic point of described each DLP projecting apparatus at screen space, obtain the initial display of described each DLP projecting apparatus according to characteristic point position at screen space, and the point of the point in each projecting apparatus space and screen space is set up one-to-one relationship, as the foundation of Coordinate Conversion between each projecting apparatus space and the screen space;
Step (1.5): described server calculates the shown rectangle RECT of a maximum in the initial display of screen space according to described each DLP projecting apparatus, each DLP projecting apparatus actual zone that will show on large-screen is to ask to hand over by the initial display of this projecting apparatus and maximum rectangle RECT to obtain, equidistantly generate the point of 8 row, 8 row in the actual displayed zone in each DLP projecting apparatus screen space, the point of these screen spaces is transformed in the projecting apparatus space, and generating mesh mesh-i;
Step (1.6): described client computer handle is distributed to the image mapped of the DLP projecting apparatus of oneself controlling to the corresponding geometric position of described grid mesh-i, remove with black all the other positions, calculate the positional information of the overlapping region of the above projecting apparatus of screen space, and be mapped in the projecting apparatus space;
Step (2): calculate stencil value according to the following steps at different brightness value images;
Step (2.1): described client computer is by the stencil value m under the following linear function calculating linear transitions
Linear:
m
Linear 1=d1/ (d1+d2),
m
Linear 2=d2/ (d1+d2),
Wherein, m
Linear 1Be the stencil value of left side DLP projecting apparatus, m
Linear 2Be the stencil value of the right DLP projecting apparatus, d1 is the distance that a bit arrives DLP projecting apparatus border, the described left side in the part of described overlay region, and d2 is the distance that a bit arrives DLP projecting apparatus border, described the right described in the part of described overlay region;
Step (2.2): described client computer is by the stencil value m under the transition of following cosine function calculating cosine
Cosine,
m
Cosine 1=cos (d1/ (d1+d2)),
m
Cosine 2=1-cos (d1/ (d1+d2));
Wherein, m
Cosine 1Be the stencil value of left side DLP projecting apparatus, m
Cosine 2Be the stencil value of the right DLP projecting apparatus, d1 is the distance that a bit arrives DLP projecting apparatus border, the described left side in the part of described overlay region, and d2 is the distance that a bit arrives DLP projecting apparatus border, described the right described in the part of described overlay region;
Step (2.3): the result that described step (2.1) and described step (2.2) are obtained handles with following non-linear γ correction function again,
m
γ1＝(m
1)
1/γ；
m
γ2＝(m
2)
1/γ；
Wherein, m
1The stencil value of left side projecting apparatus under corresponding described linear transitions or the described cosine transition, m
2Corresponding described linear transitions or described cosine transition be the stencil value of the right projecting apparatus down, and γ from 1.6 to 4.8, gets a value every 0.4, and symbiosis becomes 9 non-linear gamma functions, and corresponding linear transitions and cosine transition, symbiosis become 18 gamma correction templates;
Step (2.4): described client computer is got a brightness value L every 20 brightness between brightness value 140 and 255: 140,160,180,200,220,240,255, get a brightness value 100 again, totally 8 brightness values, as as rgb value, constitute the pure color image of 8 different brightness with these brightness values;
Step (2.5): described server is distributed to described client computer to an image that obtains in the described step (2.4);
Step (2.6): described client computer multiply by intensity correction values in the template that described step (2.3) obtains to the brightness value of the lap of the image that passes over respectively, obtain the brightness value of each point behind gamma correction, so that the original image of described lap decays, in each DLP projecting apparatus that outputs to again;
Step (2.7): each in 18 templates that described step (2.3) is obtained, repeating said steps (2.6) is selected at a best template of the image effect of described step (2.5) by the method for eye-observation;
Step (2.8): each pair in 8 sub-pictures that described step (2.4) is obtained, repeating said steps (2.5), described step (2.6) and described step (2.7), thus obtain 8 optimum templates at 8 different brightness;
Step (3): the gamma correction that carries out the above repeat region of self-adapting template big-screen of described m * n DLP projecting apparatus combination demonstration according to the following steps;
Step (3.1): described collection of server one sub-picture, the image that will show, distribute to described client computer;
Step (3.2): described client computer calculates the brightness value L 1 that passes every bit in the subimage of coming
i,
L1
i＝0.299*R+0.587*G+0.114*B，
Wherein, R, G, B are respectively R, the G of described point, the pixel value of B passage;
Step (3.3): described client computer calculates the mean value L2 of all some brightness in the described subimage,
Wherein, L1
iBe the brightness value of the described subimage every bit that calculates in the described step (3.2), n is the number of described subimage mid point;
Step (3.4): described client computer calculates the Luminance Distribution of described subimage, leaves among the array num num[i in] brightness value equals the number of the point of sequence number i in the described subimage of expression, and the value of sequence number i is 0 to 255; Maximum NL corresponding sequence number L3 among the array num is the brightness peak of described subimage;
Step (3.5): described client computer calculates the brightness value L of described subimage, when the value of the NL that obtains in the described step (3.4) greater than the number of described subimage mid point 60% the time, the brightness value L of described subimage equals the brightness peak L3 of the described subimage that obtains in the described step (3.4), otherwise the brightness value L of described subimage equal the described subimage that obtains in the described step (3.3) average brightness L2;
Step (3.6): described client computer automatically selects the template of the immediate brightness of brightness value L of a described subimage that obtains with described step (3.5) as calibration template;
Step (3.7): the adaptive template intensity correction values that described client computer obtains described step (3.6) multiply by the brightness value of described lap, obtain the brightness value of each point behind gamma correction, so that the original image of described lap is decayed, output to again in the DLP projecting apparatus of described subimage correspondence;
Step (3.8): described each DLP projecting apparatus repeating said steps (3.2) is arrived described step (3.7);
Step (3.9): described server is after certain time interval, and repeating said steps (3.1) is to described step (3.8).
The invention is characterized in, described DLP projecting apparatus is divided into two sequences by row and column, in described capable sequence, there be the overlapping of horizontal direction in the projection of two projecting apparatus that sequence number is adjacent separately, in described row sequence, there be the overlapping of vertical direction in the projection of two projecting apparatus that sequence number is adjacent separately.
The invention is characterized in that described all images is to show in real time, comprising video image.
The invention is characterized in m=2, n=2.
The present invention has following advantage compared with prior art:
1. according to the image difference that will show and self adaptation adopts different templates to carry out gamma correction, make every kind of image that a gamma correction effect preferably all be arranged, thereby obtain a good general effect.
2. adopt the method that the edge merges to generate template, simple to operation, avoided using expensive luminance meter, also avoided using the HDR method to produce very big workload.
3. the effect of adaptive template gamma correction is not influenced by the stain of screen, cut, is not subjected to the influence of the light belt of surround lighting, the generation of special screen yet.
Description of drawings
Fig. 1 is a schematic diagram of proofreading and correct the front projector viewing area;
Fig. 2 adaptive template gamma correction module;
Fig. 3 is the flow chart of adaptive template gamma correction module;
The process schematic diagram of Fig. 4 initialization module;
Fig. 5 initialization module flow chart;
Fig. 6 is the flow chart of template generation module;
Fig. 7 is the schematic diagram that the edge merges;
Fig. 8 is the schematic diagram of linear transitions;
Fig. 9 is the schematic diagram of cosine transition.
Embodiment
The present invention is achieved by the following technical programs: show a secondary big picture with the capable n row of a m projector splicing, the picture material of adjacent projections instrument all has overlapping, and overlapping areas forms bright band.By generating template, in computer, the decay mode that outputs to projecting apparatus again of original image is eliminated the high bright band of crossover region with the value in the template.Generated 18 templates at first, in advance and selected the best template of effect for the image of different brightness; Secondly, export the pure color image of 8 different brightness respectively for each projecting apparatus, pick out the template of 8 optimums; At last, according to the content difference of wanting display image and self adaptation adopts different templates to carry out gamma correction, brightness value according to the image of distributing to each projecting apparatus in real time, select the immediate template of brightness to carry out gamma correction, thereby make the image of various brightness all obtain a gamma correction effect preferably.
The basis of adaptively selected template is the average brightness or the brightness peak of the subimage of projecting apparatus among the present invention, when brightness in the subimage equal brightness peak point number greater than the number of subimage mid point 60% the time, use brightness peak, otherwise use average brightness.
The rule of adaptively selected template is the average brightness or the immediate template of brightness peak of the subimage of brightness value and projecting apparatus among the present invention.
Template among the present invention is to generate with the method that the edge merges.Different templates generates with different functions.Generated 18 templates in advance, all templates all are to generate with different gamma function combination linear functions or cosine function.
The present invention generates a template every 20 brightness between brightness value 140～255, brightness is lower than 140 the template of only getting a brightness value 100, because the low image of brightness is not fastidious to template.Obtain 8 optimum templates at 8 brightness at last.
Fig. 1 is the schematic diagram of the viewing area 15,16,17,18 of four projecting apparatus 11,12,13,14 on large-screen.In order to allow four projector splicings show secondary big pictures, each projecting apparatus only shows a part of image of big picture, and the projection between the adjacent projecting apparatus of subimage content is overlapping, and high bright band can appear in these overlapping regions.Purpose of the present invention is exactly in order to eliminate these high bright bands, to realize that the seamless splicing large screen of multi-projector shows.
The present invention mainly contains 3 modules: initialization module, template generation module and adaptive template gamma correction module.
Fig. 2 is the process schematic diagram of adaptive template gamma correction module.One station server and two computer client are arranged among the figure, and two projecting apparatus of each client computer control have four projecting apparatus 21,22,23,24.Fig. 3 is the flow chart of adaptive template gamma correction module.Collection of server one sub-picture, the subimage content that show is distributed to two client computers, and client computer calculates the brightness value of subimage.
Certain any brightness value L 1 in the subimage,
L1＝0.299*R+0.587*G+0.114*B
Wherein, R, G, B are respectively the pixel values of this point R, G, B passage.
The average brightness of computed image, and statistics Luminance Distribution.
The brightness value L of subimage equals in the subimage mean value or the peak value of all some brightness, when brightness in the subimage equal brightness peak point number greater than the number of subimage mid point 60% the time, use brightness peak, otherwise use average brightness;
Client computer automatically selects a template with the immediate brightness of brightness value L as calibration template; The adaptive template intensity correction values that the client computer handle obtains multiply by the brightness value of described lap, obtains the brightness value of each point behind gamma correction, so that the original image of lap is decayed, outputs in described each DLP projecting apparatus again.
Four projector splicings show a rectangular area behind the gamma correction, as the thick frame of black among Fig. 2.Each projecting apparatus shown in 25 among Fig. 2,26,27,28, is the original viewing area and the intersecting area of the thick frame of black in the actual displayed zone on the screen.
Fig. 4 is the process schematic diagram of initialization module.Fig. 5 is the flow chart of initialization module.Form a projecting apparatus matrix with m * n DLP projecting apparatus, two adjacent projecting apparatus are controlled with a client computer.Allow each projecting apparatus export the equally spaced characteristic point of 8 row, 8 row respectively, take pictures with digital camera, obtain the characteristic point image of each projecting apparatus, the image that obtains is carried out image processing, the point in the point of screen space and projecting apparatus space is set up one-to-one relationship, as the foundation of screen space and projecting apparatus space conversion.By asking the method for friendship to obtain the zone that projecting apparatus will show on large-screen, the zone that will show on large-screen is mapped in the projecting apparatus space, and sets up grid mesh-i in the projecting apparatus space with maximum rectangle RECT.To the geometric position of grid mesh-i correspondence, remove with black other positions the image mapped of distributing to projecting apparatus.On screen space, obtain the positional information of projecting apparatus overlapping region, and be mapped in the projecting apparatus space.
Fig. 6 is the flow chart of template generation module.At the overlapping region of each projecting apparatus, generate template with 18 different functions, specifically set forth the computational methods of template the back.At last, server sends the pure color image of 8 different brightness respectively to computer client, and client adopts 18 different templates to carry out brightness decay respectively, selects optimum template at different brightness by the mode of eye-observation.
The method that the present invention is merged with the edge is eliminated the high bright band of crossover region.Obtaining different templates with different functions, all is to be independent variable with the distance, for crossover region more arbitrarily, near more from which projecting apparatus, the value in the template is big more.Be example with two projecting apparatus among Fig. 7, d1 be crossover region a bit to the distance on projecting apparatus border, the left side, d2 is the distance on projecting apparatus border on the right of same point arrives, linear transitions so, the stencil value of left side projecting apparatus is
m
1＝d1/(d1+d2)，
The stencil value of the right projecting apparatus is
m
2＝d2/(d1+d2)。
Fig. 8 is the schematic diagram of two projecting apparatus linear transitions.The cosine transition, the stencil value of left side projecting apparatus
m
1＝cos(d1/(d1+d2))，
The stencil value of the right projecting apparatus is
m
2＝1-cos(d1/(d1+d2))。
Fig. 9 is the schematic diagram of cosine transition, can find not sudden change of cosine function, and transition is more smooth.What use among the present invention is the DLP projecting apparatus, and the pixel value of projecting apparatus and the relation of brightness are non-linear gamma function relations, proofread and correct so also will carry out γ it,
m
γ1＝(m
1)
1/γ；m
γ2＝(m
2)
1/γ，
Wherein, m
1Be the stencil value of left side projecting apparatus under linear transitions or the cosine transition, m
2It is the stencil value of the right projecting apparatus under linear transitions or the cosine transition.
Because γ the unknown, we get γ from 1.6 to 4.8, get a γ value every 0.4, and symbiosis becomes 9 gamma functions.The present invention generates template, always total template 9*2=18 to 9 different gamma functions of linear transitions and cosine transition stack respectively.
Between brightness value 140 and 255, get a brightness value L: 140,160,180,200,220,240,255 every 20 brightness, get a brightness value 100 again, totally 8 brightness values, with these brightness values as rgb value, constitute the pure color image of 8 different brightness, these images are distributed to each client computer, carry out gamma correction with 18 templates that generate previously respectively, get the template of the best template of effect as this brightness.Obtain the optimum template of 8 brightness at last, the template generating function of each brightness correspondence is as shown in table 1.
| Brightness | 255 | 240 | 220 | 200 | 180 | 160 | 140 | 100 |
| The γ value | 2.0 | 2.8 | 3.2 | 3.6 | 4.8 | 4.0 | 2.5 | 2.8 |
| The transition of linear transitions cosine | Linear | Linear | Linear | Linear | Cosine | Cosine | Linear | Cosine |
The optimum template of each brightness of table 1
Claims (4)
1. the self-adapting template big-screen brightness emendation method of multi-projector combination demonstration is characterized in that, contains following step successively:
Step (1): initialization;
Step (1.1): set up a rectangular coordinate system for described large-screen, initial point is in the lower left corner of this screen;
Step (1.2): form a projecting apparatus matrix with m * n DLP projecting apparatus, m is row, and n is row; Per two described DLP projecting apparatus are controlled with a client computer;
Step (1.3): the image that described each client computer is formed the equally spaced characteristic point of equally distributed 8 row, 8 row in each projecting apparatus space outputs to respectively in the DLP projecting apparatus of oneself controlling, the output of described each DLP projecting apparatus is taken pictures respectively in identical position with digital camera, obtain the characteristic point image of described each DLP projecting apparatus at screen space;
Step (1.4): server carries out image processing to described each characteristic point image of screen space and obtains the characteristic point of described each DLP projecting apparatus at screen space, obtain the initial display of described each DLP projecting apparatus according to characteristic point position at screen space, and the point of the point in each projecting apparatus space and screen space is set up one-to-one relationship, as the foundation of Coordinate Conversion between each projecting apparatus space and the screen space;
Step (1.5): described server calculates the shown rectangle RECT of a maximum in the initial display of screen space according to described each DLP projecting apparatus, each DLP projecting apparatus actual zone that will show on large-screen is to ask to hand over by the initial display of this projecting apparatus and maximum rectangle RECT to obtain, equidistantly generate the point of 8 row, 8 row in the actual displayed zone in each DLP projecting apparatus screen space, the point of these screen spaces is transformed in the projecting apparatus space, and generating mesh mesh-i;
Step (1.6): described client computer handle is distributed to the image mapped of the DLP projecting apparatus of oneself controlling to the corresponding geometric position of described grid mesh-i, remove with black all the other positions, calculate the positional information of the overlapping region of the above projecting apparatus of screen space, and be mapped in the projecting apparatus space;
Step (2): calculate stencil value according to the following steps at different brightness value images;
Step (2.1): described client computer is pressed the stencil value m linearity under the following linear function calculating linear transitions:
m
Linear 1=d1/ (d1+d2),
m
Linear 2=d2/ (d1+d2),
Wherein, m
Linear 1Be the stencil value of left side DLP projecting apparatus, m
Linear 2Be the stencil value of the right DLP projecting apparatus, d1 is the distance that a bit arrives DLP projecting apparatus border, the described left side in the part of described overlay region, and d2 is the distance that a bit arrives DLP projecting apparatus border, described the right described in the part of described overlay region;
Step (2.2): described client computer is by the stencil value m under the transition of following cosine function calculating cosine
Cosine,
m
Cosine 1=cos (d1/ (d1+d2)),
m
Cosine 2=1-cos (d1/ (d1+d2));
Wherein, m
Cosine 1Be the stencil value of left side DLP projecting apparatus, m
Cosine 2Be the stencil value of the right DLP projecting apparatus, d1 is the distance that a bit arrives DLP projecting apparatus border, the described left side in the part of described overlay region, and d2 is the distance that a bit arrives DLP projecting apparatus border, described the right described in the part of described overlay region;
Step (2.3): the result that described step (2.1) and described step (2.2) are obtained handles with following non-linear γ correction function again,
m
γ1＝(m
1)
1/γ；
m
γ2＝(m
2)
1/γ；
Wherein, m
1The stencil value of left side projecting apparatus under corresponding described linear transitions or the described cosine transition, m
2Corresponding described linear transitions or described cosine transition be the stencil value of the right projecting apparatus down, and γ from 1.6 to 4.8, gets a value every 0.4, and symbiosis becomes 9 non-linear gamma functions, and corresponding linear transitions and cosine transition, symbiosis become 18 gamma correction templates;
Step (2.4): described client computer is got a brightness value L every 20 brightness between brightness value 140 and 255: 140,160,180,200,220,240,255, get a brightness value 100 again, totally 8 brightness values, as as rgb value, constitute the pure color image of 8 different brightness with these brightness values;
Step (2.5): described server is distributed to described client computer to an image that obtains in the described step (2.4);
Step (2.6): described client computer multiply by intensity correction values in the template that described step (2.3) obtains to the brightness value of the lap of the image that passes over respectively, obtain the brightness value of each point behind gamma correction, so that the original image of described lap decays, in each DLP projecting apparatus that outputs to again;
Step (2.7): each in 18 templates that described step (2.3) is obtained, repeating said steps (2.6) is selected at a best template of the image effect of described step (2.5) by the method for eye-observation;
Step (2.8): each pair in 8 sub-pictures that described step (2.4) is obtained, repeating said steps (2.5), described step (2.6) and described step (2.7), thus obtain 8 optimum templates at 8 different brightness;
Step (3): the gamma correction that carries out the above repeat region of self-adapting template big-screen of described m * n DLP projecting apparatus combination demonstration according to the following steps;
Step (3.1): described collection of server one sub-picture, the image that will show, distribute to described client computer;
Step (3.2): described client computer calculates the brightness value L 1 that passes every bit in the subimage of coming
i,
L1
i＝0.299*R+0.587*G+0.114*B，
Wherein, R, G, B are respectively R, the G of described point, the pixel value of B passage;
Step (3.3): described client computer calculates the mean value L2 of all some brightness in the described subimage,
Wherein, L1
iBe the brightness value of the described subimage every bit that calculates in the described step (3.2), n is the number of described subimage mid point;
Step (3.4): described client computer calculates the Luminance Distribution of described subimage, leaves among the array num num[i in] brightness value equals the number of the point of sequence number i in the described subimage of expression, and the value of sequence number i is 0 to 255; Maximum NL corresponding sequence number L3 among the array num is the brightness peak of described subimage;
Step (3.5): described client computer calculates the brightness value L of described subimage, when the value of the NL that obtains in the described step (3.4) greater than the number of described subimage mid point 60% the time, the brightness value L of described subimage equals the brightness peak L3 of the described subimage that obtains in the described step (3.4), otherwise the brightness value L of described subimage equal the described subimage that obtains in the described step (3.3) average brightness L2;
Step (3.6): described client computer automatically selects the template of the immediate brightness of brightness value L of a described subimage that obtains with described step (3.5) as calibration template;
Step (3.7): the adaptive template intensity correction values that described client computer obtains described step (3.6) multiply by the brightness value of described lap, obtain the brightness value of each point behind gamma correction, so that the original image of described lap is decayed, output to again in the DLP projecting apparatus of described subimage correspondence;
Step (3.8): described each DLP projecting apparatus repeating said steps (3.2) is arrived described step (3.7);
Step (3.9): described server is after certain time interval, and repeating said steps (3.1) is to described step (3.8).
2. the self-adapting template big-screen brightness emendation method that multi-projector combination according to claim 1 shows is characterized in that, described DLP projecting apparatus is divided into two sequences by row and column, in described capable sequence, there be the overlapping of horizontal direction in the projection of two projecting apparatus that sequence number is adjacent separately, in described row sequence, there be the overlapping of vertical direction in the projection of two projecting apparatus that sequence number is adjacent separately.
3. the self-adapting template big-screen brightness emendation method that multi-projector combination according to claim 1 shows is characterized in that described all images is to show in real time, comprising video image.
4. the self-adapting template big-screen brightness emendation method that multi-projector combination according to claim 1 shows is characterized in that m=2, n=2.
Priority Applications (1)
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|---|---|---|---|
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| TWI818282B (en) * | 2021-07-12 | 2023-10-11 | 明基電通股份有限公司 | Projector device, projector system and method for calibrating projected image |
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| CN101964891B (en) * | 2010-09-13 | 2012-07-25 | 广东威创视讯科技股份有限公司 | Screen seamless mosaicing image processing method and device therefor |
| CN102053812B (en) * | 2010-10-09 | 2012-09-05 | 清华大学 | Multi-projector combined display feedback brightness correction method |
| KR20140048073A (en) * | 2010-11-15 | 2014-04-23 | 스케일러블 디스플레이 테크놀로지스, 인크. | System and method for calibrating a display system using manual and semi-automatic techniques |
| CN102109972B (en) * | 2011-02-14 | 2012-09-12 | 深圳雅图数字视频技术有限公司 | Projector television wall display method and system |
| CN102231099B (en) * | 2011-07-06 | 2014-06-18 | 清华大学 | Method for correcting per-pixel response brightness in multi-projector auto-stereoscopic display |
| JP5950554B2 (en) | 2011-12-02 | 2016-07-13 | キヤノン株式会社 | Display device, information processing device, control method thereof, projection system, program, and storage medium |
| CN104601913B (en) * | 2013-10-30 | 2017-11-03 | 北京莫高丝路文化发展有限公司 | Ball curtain multi-channel edge fusion method |
| US10701375B2 (en) * | 2016-03-23 | 2020-06-30 | Dolby Laboratories Licensing Corporation | Encoding and decoding reversible production-quality single-layer video signals |
| CN106791741B (en) * | 2016-12-07 | 2018-09-21 | 重庆杰夫与友文化创意有限公司 | Multi-screen marching method and device |
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| TWI818282B (en) * | 2021-07-12 | 2023-10-11 | 明基電通股份有限公司 | Projector device, projector system and method for calibrating projected image |
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