CN104601913A - Dome screen multichannel edge blending method - Google Patents

Abstract

The invention provides a dome screen multichannel edge blending method. The method comprises the following steps: projecting application scenarios of pictures through multichannel for a plurality of projectors; defining a pure white texture picture which has the same size with the projected picture for each projector; adjusting pixel dot brightness of the pure white texture picture to obtain a processed texture picture; overlapping and covering the processed texture picture on an original texture image of the projector to obtain a new texture image; protecting respective new texture image by each projector, performing edge blending on blending bands of the new texture images to obtain a projection picture finally projected on the dome screen. A layer of texture image with adjusted pixel is overlapped and covered on the original texture image of the projector to achieve the problem of adjusting the edge brightness of the projected texture image through the mutual interference of two texture images, and then the blending band brightness problem of the projection pictures of the plurality of projectors is adjusted, and the display quality of the projection picture projected to the dome screen is improved.

Description

Ball curtain multi-channel edge fusion method

Technical field

The invention belongs to screen prjection Display Technique field, be specifically related to a kind of ball curtain multi-channel edge fusion method.

Background technology

Along with the high speed development of science and technology, social informatization degree also constantly strengthens, and Large Screen Projection Technology is widely used in convention, the motion picture projection even field such as home entertaining in recent years.

As the one of large screen projection, the projection of ball curtain multichannel refers to and uses multiple stage projector, spherical screen is spliced fusion and to project out complete continuous print picture.Ball-screen projection can show the display effect of high-resolution, with great visual angle scope, can bring novel visual experience to spectators, allows the audience's feeling arrive strong vision shock and sensation on the spot in person.

But for the projection of ball curtain multichannel, due to the error in measurements and calculations, projector throws that picture on curtain body is unavoidable exists deviation with expection, and the process of projected picture being carried out to entirety or local directed complete set is called geometric correction.In computer 3D technology, by using projected picture as texture, texture coordinate is corresponding with uniform array of vertices, by adjusting the position on summit, just can realize entirety or the local directed complete set of projected picture.

Projection image due to multiple projector exists overlapping, is called by lap and merges band, therefore, merges the brightness of brightness higher than Non-overlapping Domain of band, and then affects the visual effect of user's viewing.

Summary of the invention

For the defect that prior art exists, the invention provides a kind of ball curtain multi-channel edge fusion method, the brightness of merging band can be adjusted simply and easily, improve the display quality projecting the projected picture of ball curtain.

The technical solution used in the present invention is as follows:

The invention provides a kind of ball curtain multi-channel edge fusion method, comprise the following steps:

S1, for the application scenarios of multiple stage projector by multichannel projection image, for each projector, all defines one and its projection image equal-sized pure white texture picture;

S2, adjusts the pixel brightness of described pure white texture picture, obtains the texture picture after processing;

S3, the texture picture in the former texture maps of described projector after the described process of superposition covering, obtains new texture maps;

S4, Ge Tai projector all projects texture maps new separately, and the fusion band of the texture maps that each Zhang Suoshu is new carries out Fusion Edges, is finally projected the projected picture on ball curtain.

Preferably, S2 specifically comprises the following steps:

S21, for a described pure white texture picture, this pure white texture picture is normalized to rectangle, with the summit, the lower left corner (0 of pure white texture picture, 0) be initial point, with the direction of pure white texture picture bottom side length for x-axis direction, with the direction at long place, the pure white texture picture left side for y-axis direction, set up plane right-angle coordinate;

S22 take x as independent variable, on described pure white texture picture, draws four blend curves, is respectively: left side blend curve, the right blend curve, top blend curve and following blend curve; For each blend curve, define a constant d respectively, represent and merge bandwidth, then draw another blend curve parallel with this blend curve with this constant d, the region between two blend curves is merges band; And then obtain four fusion bands;

S23, adjusts the brightness that four merge band respectively, namely obtains the texture picture after processing.

Preferably, four blend curves are respectively by following function definition:

Left side blend curve is defined as: f _(x)=C ₀+ C ₁(x-0.5)+C ₂(x-0.5) ²+ g _(x)-h _(x);

Wherein, C ₀, C ₁, C ₂, C ₃, C ₄for constant;

$g_{\left(x\right)}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0,0.5}\right]\\ C_3{(x-0.5)}^3,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.$

$h_{\left(x\right)}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0.5,1}\right]\\ C_4{(x-0.5)}^3,x\∈\left[\mathrm{0,0.5}\right]\end{array}\right.;$

The right blend curve is defined as:

$K_{(1-x)}{=C}_0+C_1(0.5-x)+C_2{(0.5-x)}^2+g_{1_{\left(x\right)}}-h_{1_{\left(x\right)}}$

Wherein, C ₀, C ₁, C ₂, C ₃, C ₄for constant;

$g_{1_{\left(x\right)}}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0.5,1}\right]\\ C_3{(0.5-x)}^3,x\∈\left[\mathrm{0,0.5}\right]\end{array}\right.$

$h_{1_{\left(x\right)}}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0,0.5}\right]\\ C_4{(0.5-x)}^3,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.$

Following blend curve and left side blend curve, by straight line y=x symmetry, are the inverse function of left side blend curve, are defined as: G (x)=f _(x) ^-;

Top blend curve and the right blend curve, by straight line y=x symmetry, are the inverse function of the right blend curve, are defined as: G _(X)=1-K _(x) ^-.

Preferably, S23, adjusts the brightness that four merge band respectively, is specially:

S231, band is merged for any one, be two blend curves encirclements be parallel to each other to form, bring in fusion and draw a horizontal line, the intersection point of itself and a blend curve is defined as 0, be defined as 1 with the intersection point of another blend curve, the line segment between two intersection points, for merging bandwidth, represents the change of merging bandwidth with variable x;

S232, carries out Gamma correction to fusion band, is defined as by correction function: d _(x) ^1/G;

Wherein: G is constant;

$d_{\left(x\right)}=\left\{\begin{array}{c}0.5*{\left(2x\right)}^p,x\∈\left[\mathrm{0,0.5}\right]\\ 1-0.5*{\left(2(1-x)\right)}^p,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.;$ Wherein p is constant;

Then: merge each pixel in band and pass through the Overlapping display of R, G, B tri-colors;

R=R ₀* d _(x) ^1/G, wherein R ₀for the pixel color value before adjustment, R is the pixel color value after adjustment;

G=G ₀* d _(x) ^1/G, wherein G ₀for the pixel color value before adjustment, G is the pixel color value after adjustment;

B=B ₀* d _(x) ^1/G, wherein B ₀for the pixel color value before adjustment, B is the pixel color value after adjustment.

Beneficial effect of the present invention is as follows:

Ball curtain multi-channel edge fusion method provided by the invention, the texture maps after covering the adjustment of one deck pixel is superposed again on the former texture maps of projector, by influencing each other of two texture maps, reach the problem of the texture maps edge brightness that adjustment projects, and then have adjusted multiple stage projector picture fusion band brightness problem, thus improve the display quality of the projected picture projecting ball curtain.

Accompanying drawing explanation

Fig. 1 is the structural representation of ball curtain multi-channel edge fusion method provided by the invention;

Fig. 2 is the exemplary plot of pure white texture picture provided by the invention;

Fig. 3 is the plane right-angle coordinate schematic diagram set up on pure white texture picture provided by the invention;

Fig. 4 provided by the inventionly draws blend curve schematic diagram on pure white texture picture;

Fig. 5 is the function curve diagram of d (x) provided by the invention;

Fig. 6 is correction function d provided by the invention _(x) ^1/Gfunction curve diagram.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in detail:

As shown in Figure 1, the invention provides a kind of ball curtain multi-channel edge fusion method, comprise the following steps:

S1, for the application scenarios of multiple stage projector by multichannel projection image, for each projector, all defines one and its projection image equal-sized pure white texture picture, as shown in Figure 2, is the exemplary plot of a pure white texture picture.

S2, adjusts the pixel brightness of described pure white texture picture, obtains the texture picture after processing;

This step specifically comprises the following steps:

S21, for a described pure white texture picture, this pure white texture picture is normalized to rectangle, as shown in Figure 3, with the summit, the lower left corner of pure white texture picture (0,0) for initial point, with the direction of pure white texture picture bottom side length for x-axis direction, with the direction at long place, the pure white texture picture left side for y-axis direction, set up plane right-angle coordinate;

S22 as shown in Figure 4, take x as independent variable, on described pure white texture picture, draws four blend curves, is respectively: left side blend curve, the right blend curve, top blend curve and following blend curve; For each blend curve, define a constant d respectively, represent and merge bandwidth, then draw another blend curve parallel with this blend curve with this constant d, the region between two blend curves is merges band; And then obtain four fusion bands;

Article four, blend curve is respectively by following function definition:

Left side blend curve is defined as: f _(x)=C ₀+ C ₁(x-0.5)+C ₂(x-0.5) ²+ g _(x)-h _(x);

Wherein, C ₀, C ₁, C ₂, C ₃, C ₄for constant;

$g_{\left(x\right)}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0,0.5}\right]\\ C_3{(x-0.5)}^3,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.$

$h_{\left(x\right)}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0.5,1}\right]\\ C_4{(x-0.5)}^3,x\∈\left[\mathrm{0,0.5}\right]\end{array}\right.;$

The right blend curve is defined as:

$K_{(1-x)}=C_0+C_1(0.5-x)+C_2{(0.5-x)}^2+g_{1_{\left(x\right)}}-h_{1_{\left(x\right)}}$

Wherein, C ₀, C ₁, C ₂, C ₃, C ₄for constant;

$g_{1_{\left(x\right)}}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0.5,1}\right]\\ C_3{(0.5-x)}^3,x\∈\left[\mathrm{0,0.5}\right]\end{array}\right.$

$h_{1_{\left(x\right)}}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0,0.5}\right]\\ C_4{(0.5-x)}^3,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.$

Following blend curve and left side blend curve, by straight line y=x symmetry, are the inverse function of left side blend curve, are defined as: G (x)=f _(x) ^-;

Top blend curve and the right blend curve, by straight line y=x symmetry, are the inverse function of the right blend curve, are defined as: G _(X)=1-K _(x) ^-.

By changing the parameters such as the constant term of the defined function of four blend curves, the object that belt shape, area and position are merged in adjustment can be reached.

S23, adjusts the brightness that four merge band respectively, namely obtains the texture picture after processing.

Concrete employing following methods:

S231, band is merged for any one, be two blend curves encirclements be parallel to each other to form, bring in fusion and draw a horizontal line, the intersection point of itself and a blend curve is defined as 0, be defined as 1 with the intersection point of another blend curve, the line segment between two intersection points, for merging bandwidth, represents the change of merging bandwidth with variable x;

S232, carries out Gamma correction to fusion band, is defined as by correction function: d _(x) ^1/G;

Wherein: G is constant;

$d_{\left(x\right)}=\left\{\begin{array}{c}0.5*{\left(2x\right)}^p,x\∈\left[\mathrm{0,0.5}\right]\\ 1-0.5*{\left(2(1-x)\right)}^p,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.;$ Wherein p is constant;

As shown in Figure 5, be the function curve diagram of d (x); Fig. 6 is correction function d _(x) ^1/Gfunction curve diagram.

Merge region to be made up of multiple pixel, for adjusting the brightness of each pixel, definition Red, Green, Black tri-colors, each pixel brightness is by Red, Green, Black tri-color addition displays, and the color variation range of Red is 0 ~ 255, the color variation range of Green is the color variation range of 0 ~ 255, Black is 0 ~ 255.

The brightness of pixel changes along with the change of Red, Green, Black tri-colors.When the color value that the color value that the color value of Red is 0, Green is 0, Black is 0, pixel presents black; When the color value that the color value that the color value of Red is 255, Green is 255, Black is 255, pixel presents white; When a certain value that the color value of Red is between 0 ~ 255, when the color value of Green is a certain value between 0 ~ 255, when the color value of Black is a certain value between 0 ~ 255, the brightness of pixel presents corresponding change.

Carry out brightness adjustment to each pixel, R, G, B before adjustment and after adjustment have following relation:

R=R ₀* d _(x) ^1/G, wherein R ₀for the pixel color value before adjustment, R is the pixel color value after adjustment;

G=G ₀* d _(x) ^1/G, wherein G ₀for the pixel color value before adjustment, G is the pixel color value after adjustment;

B=B ₀* d _(x) ^1/G, wherein B ₀for the pixel color value before adjustment, B is the pixel color value after adjustment.

S3, the texture picture in the former texture maps of described projector after the described process of superposition covering, obtains new texture maps;

In the present invention, when the texture picture superposition after process is covered in former texture maps, because four inner enclosing region of fusion band are pure white, therefore, the brightness of former texture maps central area is not had an impact; And four brightness of merging the region of band own are grey, its color changes along with the function of definition, therefore, changes the fringe region brightness of former texture maps, and then reaches the problem of adjustment former texture maps overlap-add region brightness.Article four, merging band perimeter is black.

S4, Ge Tai projector all projects texture maps new separately, and the fusion band of the texture maps that each Zhang Suoshu is new carries out Fusion Edges, is finally projected the projected picture on ball curtain.

In sum, ball curtain multi-channel edge fusion method provided by the invention, the texture maps after covering the adjustment of one deck pixel is superposed again on the former texture maps of projector, by influencing each other of two texture maps, reach the problem of the texture maps edge brightness that adjustment projects, and then have adjusted multiple stage projector picture fusion band brightness problem, thus improve the display quality of the projected picture projecting ball curtain.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.

Claims (4)

1. a ball curtain multi-channel edge fusion method, is characterized in that, comprise the following steps:

S1, for the application scenarios of multiple stage projector by multichannel projection image, for each projector, all defines one and its projection image equal-sized pure white texture picture;

S2, adjusts the pixel brightness of described pure white texture picture, obtains the texture picture after processing;

S3, the texture picture in the former texture maps of described projector after the described process of superposition covering, obtains new texture maps;

S4, Ge Tai projector all projects texture maps new separately, and the fusion band of the texture maps that each Zhang Suoshu is new carries out Fusion Edges, is finally projected the projected picture on ball curtain.

2. ball curtain multi-channel edge fusion method according to claim 1, it is characterized in that, S2 specifically comprises the following steps:

S21, for a described pure white texture picture, this pure white texture picture is normalized to rectangle, with the summit, the lower left corner (0 of pure white texture picture, 0) be initial point, with the direction of pure white texture picture bottom side length for x-axis direction, with the direction at long place, the pure white texture picture left side for y-axis direction, set up plane right-angle coordinate;

S22 take x as independent variable, on described pure white texture picture, draws four blend curves, is respectively: left side blend curve, the right blend curve, top blend curve and following blend curve; For each blend curve, define a constant d respectively, represent and merge bandwidth, then draw another blend curve parallel with this blend curve with this constant d, the region between two blend curves is merges band; And then obtain four fusion bands;

S23, adjusts the brightness that four merge band respectively, namely obtains the texture picture after processing.

3. ball curtain multi-channel edge fusion method according to claim 2, it is characterized in that, four blend curves are respectively by following function definition:

Left side blend curve is defined as: f _(x)=C ₀+ C ₁(x-0.5)+C ₂(x-0.5) ²+ g _(x)-h _(x);

Wherein, C ₀, C ₁, C ₂, C ₃, C ₄for constant;

$g_{\left(x\right)}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0,0.5}\right]\\ C_3{(x-0.5)}^3,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.$

$h_{\left(x\right)}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0.5,1}\right]\\ C_4{(x-0.5)}^3,x\∈\left[\mathrm{0,0.5}\right]\end{array}\right.;$

The right blend curve is defined as:

$K_{(1-x)}=C_0+C_1(0.5-x)+C_2{(0.5-x)}^2+g_{1_{\left(x\right)}}-h_{1_{\left(x\right)}}$

Wherein, C ₀, C ₁, C ₂, C ₃, C ₄for constant;

$g_{1_{\left(x\right)}}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0.5,1}\right]\\ C_3{(0.5-x)}^3,x\∈\left[\mathrm{0,0.5}\right]\end{array}\right.$

$h_{1_{\left(x\right)}}=\left\{\begin{array}{c}0,x\∈\left[\mathrm{0,0.5}\right]\\ C_4{(0.5-x)}^3,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.$

Following blend curve and left side blend curve, by straight line y=x symmetry, are the inverse function of left side blend curve, are defined as: G (x)=f _(x) ^-;

Top blend curve and the right blend curve, by straight line y=x symmetry, are the inverse function of the right blend curve, are defined as: G _(X)=1-K _(x) ^-.

4. ball curtain multi-channel edge fusion method according to claim 2, is characterized in that, S23, adjusts the brightness that four merge band respectively, is specially:

S231, band is merged for any one, be two blend curves encirclements be parallel to each other to form, bring in fusion and draw a horizontal line, the intersection point of itself and a blend curve is defined as 0, be defined as 1 with the intersection point of another blend curve, the line segment between two intersection points, for merging bandwidth, represents the change of merging bandwidth with variable x;

S232, carries out Gamma correction to fusion band, is defined as by correction function: d _(x) ^1/G;

Wherein: G is constant;

$d_{\left(x\right)}=\left\{\begin{array}{c}0.5*{\left(2x\right)}^p,x\∈\left[\mathrm{0,0.5}\right]\\ 1-0.5*{\left(2(1-x)\right)}^p,x\∈\left[\mathrm{0.5,1}\right]\end{array}\right.;$ Wherein p is constant;

Then: merge each pixel in band and pass through the Overlapping display of R, G, B tri-colors;

R=R ₀* d _(x) ^1/G, wherein R ₀for the pixel color value before adjustment, R is the pixel color value after adjustment;

G=G ₀* d _(x) ^1/G, wherein G ₀for the pixel color value before adjustment, G is the pixel color value after adjustment;

B=B ₀* d _(x) ^1/G, wherein B ₀for the pixel color value before adjustment, B is the pixel color value after adjustment.