CN102081284A - Edge blending method for splicing multiple projection images - Google Patents
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Abstract
The invention discloses an edge blending method for splicing multiple projection images, comprising the following steps: setting the size value of a projection overlapping region between adjacent projection images; cutting each frame of image based on pixels according to the number and the resolution of projectors and the size value of the projection overlapping region; setting the sensitivity weights of color channels of red, green and blue of each projector; calculating the boundary distance from each pixel point in each image to the boundary of the image; according to the boundary distance and the size value of the projection overlapping region, calculating the color weight of each pixel point; according to the sensitivity weights of the color channels and the color weight of the pixel point, calculating to obtain the pixel attenuation weight vector of the projection overlapping region; and respectively multiplying the red color value, the green color value and the blue color value of each pixel point in the image overlapping region by the respective pixel attenuation weight vector. The edge blending method overcomes the image overlapping region display defects in the existing multi-projector projection technology, and realizes that images from multiple projectors form smooth transition in the overlapping region, thereby greatly improving the whole visual effect of a picture.
Description
Technical field
The present invention relates to a kind of projector method for displaying image, be specifically related to a kind of edge amalgamation method that is used for a plurality of projected image splicings.
Background technology
High resolving power, the large screen display of high brightness are applied to fields such as visualization in scientific computing, industrial design, virtual manufacturing, Military Simulation, amusement more and more widely.Present widely used large screen display system or adopt big screen display wall perhaps adopts high performance projector, and cost is very expensive.Therefore, adopt the seamless spliced high resolution large screen display system of a plurality of projector array, also just more and more welcome.
The system construction drawing of multi-projector tiled display is shown in Fig. 1-2, the projector array splicing that utilizes a plurality of projectors to form can realize the demonstration of screen, utilize the seamless spliced display effect figure of the projected array of four projectors' compositions, middle line is the overlapping region that marks.But, many projectors are in the projection splicing, and the lap of two projectors or many projectors causes this field color obviously different with underlapped zone owing to have many projectors to throw the light of same intensity simultaneously, can not accomplish seamless spliced, make normally watch influenced.
Present technology processing overlapping zone by the following technical solutions often, but all there is separately deficiency:
(1) hard-edge merges: the i.e. edge of two projector alignment as shown in Figure 3, zero lap part.This method realizes simple, and calculated amount is few; But hardware is installed difficulty, and is difficult to be installed to seamless state, and the coupling part two projectors has tangible splicing slit;
(2) simply overlapping: promptly the picture of two projector overlaps, but does not do the attenuation processing of color and brightness.This method realizes simple, and calculated amount is few, although do not have the slit at the lap of view field, overlap-add region is obviously than other non-overlap-add region brightness height, and influence is normally watched.
(3) the integration region brightness stack that reduces by half: be the overlapping region with projector, during projection, the brightness of projection directly is kept to original half, and in theory, the brightness value after two projectors are overlapping just in time is the brightness value of original single projector.This mode, this simple decay mode, the color of overlapping region and brightness are subjected to the influence of light, projector distance of two projector's hardware, projector space environment very big, overlap-add region is obviously low than the brightness of single projector projection, color has tangible deviation, at the edge of overlap-add region tangible separator bar is arranged simultaneously.
Summary of the invention
The object of the invention provides a kind of edge amalgamation method that is used for a plurality of projected image splicings, this method overcomes doubling of the image zone display defect in existing many shadow casting techniques, realized that many projector's images the seamlessly transitting of overlapping region, provide the whole visual effect of picture greatly.
For achieving the above object, the technical solution used in the present invention is:
A kind of edge amalgamation method that is used for a plurality of projected image splicings may further comprise the steps:
Step 1. set the projection overlapping region size value between the adjacent projections image;
Step 3. the grid that throws according to each projector is adjusted into described projection overlapping region size value with each institute of projector image projected overlapping region size;
Step 4. the susceptibility weights of Color Channel in the red, green, blue three of each projector are set to respectively: red channel susceptibility weights scope is 0.8 – 1.6; Green channel susceptibility weights scope is 0.4 – 1.2; Blue channel susceptibility weights scope is 0.4 – 1.2;
Step 5. calculate the frontier distance d of each pixel in each image successively to this image boundary
j(x, y), wherein j ∈ (L, T, R, B), (x is that pixel is at described this image internal coordinate, L presentation video left hand edge, T presentation video coboundary, R presentation video right hand edge, B presentation video lower limb y);
Step 6. judge described pixel whether in doubling of the image zone according to described frontier distance and projection overlapping region size value, if not in doubling of the image zone, then not handling is that the color weight value of pixel is set to 1; Otherwise, calculating the color weight value of each pixel according to described frontier distance and projection overlapping region size value, concrete formula is as follows:
C (x, y)=a0+... + ai* (d
j(x, y)/W) 1/i+ Wherein, (x y) is the color weight value of pixel to C; A0, ai are the polynomial expression correction factors, this coefficient scope between 0.0f – 1.0f, and a0+... + ai+...=1; d
j(x y) is the frontier distance of pixel; W is a projection overlapping region size value;
Step 7. according to the color weight value of the susceptibility weights and the pixel of described Color Channel, calculate the pixel decay weight vector R that obtains the projection overlapping region
k(x, y), its computing formula is:
R
k(x,y)?=?E
k?*?C(x,y)；
Wherein (x y) is the coordinate of this pixel in its projected image, R
k(x y) is the vector of a three-dimensional, and component is respectively to redness, green, blue color weight component value that should pixel, and k ∈ (r, g, b); R, g, b represent Color Channel in the RGB three;
Step 8. with each pixel in the doubling of the image zone
The pointThe red, green, blue color value multiply by separately pixel decay weight vector respectively, thereby obtain the color value of actual pixels point, and while Projection Display.
Related content in the technique scheme is explained as follows:
1, in the such scheme, described step 3 further comprises: different projectors red, green, blue color component is separately proofreaied and correct respectively be corresponding standard value.
2, in the such scheme, projection overlapping region size value can be set to 64 pixels or 128 pixels or 192 pixels or 256 pixels in the described step 1.
Because the technique scheme utilization, the present invention compared with prior art has following advantage and effect:
The existing pixel to the overlapping region of the present invention adopts the nonlinear attenuation mode, is shown by many projector's image overlay, allows the beholder can't see splicing part between the projector, accomplishes to seamlessly transit, and makes overlap-add region and the projection of single projector go out same effect; Secondly, the susceptibility weights of Color Channel in the red, green, blue three are treated with a certain discrimination, when having avoided to the unified processing of three Color Channels, the situation of the color intensity inequality that eye-observation obtains; Once more, the grid that throws according to each projector is adjusted into described projection overlapping region size value with each institute of projector image projected overlapping region size, this adjustment mode makes that the scope of overlapping region is more accurate, makes projected image can not produce phenomenons such as ghost image, dislocation; Once more, the pixel color that the color weight value of the susceptibility weights of Color Channel and pixel is combined the overlapping region is provided with, make the overlapping region transitions smooth, color is even, do not see obvious color difference, that gives the observer feels to be exactly an image that whole projector projects, and imperceptible is the existence of many projectors.
Description of drawings
Accompanying drawing 1 is many projector structural representations;
Accompanying drawing 2 is a projected image overlapping region synoptic diagram;
Accompanying drawing 3 merges synoptic diagram for existing hard-edge;
Accompanying drawing 4 is the inventive method schematic flow sheet;
Accompanying drawing 5 is red, green, blue spectrogram synoptic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment: a kind of edge amalgamation method that is used for a plurality of projected image splicings shown in accompanying drawing 4-5, may further comprise the steps:
Step 1. set the projection overlapping region size value between the adjacent projections image.
Step 3. the grid that throws according to each projector is adjusted into described projection overlapping region size value with each institute of projector image projected overlapping region size.
Step 4. the susceptibility weights of Color Channel in the red, green, blue three of each projector are set to respectively: red channel susceptibility weights scope is 0.8 – 1.6; Green channel susceptibility weights scope is 0.4 – 1.2; Blue channel susceptibility weights scope is 0.4 – 1.2.
Step 5. calculate the frontier distance d of each pixel in each image successively to this image boundary
j(x, y), wherein j ∈ (L, T, R, B), (x is that pixel is at described this image internal coordinate, L presentation video left hand edge, T presentation video coboundary, R presentation video right hand edge, B presentation video lower limb y).
Step 6. judge described pixel whether in doubling of the image zone according to described frontier distance and projection overlapping region size value, if not in doubling of the image zone, then not handling is that the color weight value of pixel is set to 1; Otherwise, calculating the color weight value of each pixel according to described frontier distance and projection overlapping region size value, concrete formula is as follows:
C (x, y)=a0+... + ai* (d
j(x, y)/W) 1/i+ Wherein, (x y) is the color weight value of pixel to C; A0, ai are the polynomial expression correction factors, this coefficient scope between 0.0f – 1.0f, and a0+... + ai+...=1; d
j(x y) is the frontier distance of pixel; W is a projection overlapping region size value.
Step 7. according to the color weight value of the susceptibility weights and the pixel of described Color Channel, calculate the pixel decay weight vector R that obtains the projection overlapping region
k(x, y), its computing formula is:
R
k(x,y)?=?E
k?*?C(x,y)；
Wherein (x y) is the coordinate of this pixel in its projected image, R
k(x y) is the vector of a three-dimensional, and component is respectively to redness, green, blue color weight component value that should pixel, and k ∈ (r, g, b); R, g, b represent Color Channel in the RGB three.
Step 8. the red, green, blue color value of each pixel in the doubling of the image zone be multiply by pixel decay weight vector separately respectively, thereby obtain the color value of actual pixels point, and the while Projection Display.
Described step 3 further comprises: different projectors red, green, blue color component is separately proofreaied and correct respectively be corresponding standard value; Prevent because the image that different projectors projects has aberration, thereby take the color of image that the projection of several projectors goes out is proofreaied and correct.
Projection overlapping region size value can be set to 64 pixels or 128 pixels or 192 pixels or 256 pixels in the described step 1.
This edge amalgamation method of present embodiment when the multi-projector tiled display to the method for amalgamation processing of overlap-add region.It is a vital link in the whole projection splicing flow process that the edge merges, and the quality that this link is handled has determined whole splicing to merge last effect, is the important interpretational criteria that success or not is merged in splicing.
It is exactly the misalignment in processing overlapping zone that the edge merges the work that will do, make that the color of overlapping region is consistent with the color of image that single projector projects, give the people feel be exactly whole projection screen all be that the same that a projector or real world devices show arranged.Allow the beholder can't see splicing part between the projector, accomplish to seamlessly transit edge fusion goal that Here it is.Because the overlapping region of two or more projector projections exists a plurality of projections to repeat the projection that superposes, tangible aberration appears in the color intensity height than the zone of single projector projection.We need carry out color relax to lap, the work that the edge merges is exactly that the projector's color of image that projects to the overlapping region is carried out, before projecting to screen, each projector carries out color relax, make that the lap color intensity of two or all platform projector projections is consistent with the color intensity of separate unit projector projection, accomplish that it is the Projection Display of process splicing that naked eyes can not differentiated, and accomplishes seamless spliced large scale screen display.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
1. one kind is used for the edge amalgamation method that a plurality of projected images splice, and it is characterized in that: may further comprise the steps:
Step 1. set the projection overlapping region size value between the adjacent projections image;
Step 2. according to projector's number, resolution and described projection overlapping region size value based on each two field picture of pixel segmentation;
Step 3. the grid that throws according to each projector is adjusted into described projection overlapping region size value with each institute of projector image projected overlapping region size;
Step 4. the susceptibility weights of Color Channel in the red, green, blue three of each projector are set to respectively: red channel susceptibility weights scope is 0.8 – 1.6; Green channel susceptibility weights scope is 0.4 – 1.2; Blue channel susceptibility weights scope is 0.4 – 1.2;
Step 5. calculate the frontier distance d of each pixel in each image successively to this image boundary
j(x, y), wherein j ∈ (L, T, R, B), (x is that pixel is at described this image internal coordinate, L presentation video left hand edge, T presentation video coboundary, R presentation video right hand edge, B presentation video lower limb y);
Step 6. judge described pixel whether in doubling of the image zone according to described frontier distance and projection overlapping region size value, if not in doubling of the image zone, then not handling is that the color weight value of pixel is set to 1; Otherwise, calculating the color weight value of each pixel according to described frontier distance and projection overlapping region size value, concrete formula is as follows:
C (x, y)=a0+... + ai* (d
j(x, y)/W) 1/i+ Wherein, (x y) is the color weight value of pixel to C; A0, ai are the polynomial expression correction factors, this coefficient scope between 0.0f – 1.0f, and a0+... + ai+...=1; d
j(x y) is the frontier distance of pixel; W is a projection overlapping region size value;
Step 7. according to the color weight value of the susceptibility weights and the pixel of described Color Channel, calculate the pixel decay weight vector R that obtains the projection overlapping region
k(x, y), its computing formula is:
R
k(x,y)?=?E
k?*?C(x,y)；
Wherein (x y) is the coordinate of this pixel in its projected image, R
k(x y) is the vector of a three-dimensional, and component is respectively to redness, green, blue color weight component value that should pixel, and k ∈ (r, g, b); R, g, b represent Color Channel in the RGB three;
Step 8. the red, green, blue color value of each pixel in the doubling of the image zone be multiply by pixel decay weight vector separately respectively, thereby obtain the color value of actual pixels point, and the while Projection Display.
2. edge amalgamation method according to claim 1 is characterized in that: described step 4 further comprises: different projectors red, green, blue color component is separately proofreaied and correct respectively be corresponding standard value.
3. edge amalgamation method according to claim 1 is characterized in that: projection overlapping region size value can be set to 64 pixels or 128 pixels or 192 pixels or 256 pixels in the described step 1.
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| CN2010105781790A CN102081284A (en) | 2010-12-08 | 2010-12-08 | Edge blending method for splicing multiple projection images |
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Application publication date: 20110601 |