CN103974050B - Unit multichannel projective synchronization method - Google Patents

Abstract

The invention provides a kind of unit multi-channel synchronization method, belong to technical field of image processing.The method comprises: the physical quantity of the viewing area of the screen that each passage is corresponding in A, acquisition K passage; B, controller receive after data image to be projected carry out data fusion rectification to view data, are assigned to the projector of each display channel chronologically; The projector of C, each passage, receiving after controller sends view data, sends one and feeds back signal to controller; D, controller generate control signal after receiving the feedback signal of all projectors; Then control signal is sent to simultaneously the projector of each passage; After the projector of E, each passage receives described control signal, send drive singal and be converted to light signal with the view data after making received fusion correct and project to corresponding viewing area.Method provided by the invention can make projected image seamless display.

Description

Single-machine multi-channel projection synchronization method

Technical Field

The invention relates to a single-machine multi-channel projection synchronization method, and belongs to the technical field of display control.

Background

The single-machine multi-channel projection realizes simultaneous and synchronous projection of a plurality of projections, and each projector can project contents of different scenes, so that the displayed information amount is greatly improved, and the view field range is expanded. With the reduction of hardware thresholds and the maturity of software technologies of the single-machine multi-channel projection technology, more and more units, individuals and industries start to use multi-screen display platforms, wherein the single-machine multi-channel projection technology has a good application prospect in the fields of virtual geographic environment, digital city, city or garden landscape planning and design, military battlefield simulation, visual forest management, dynamic simulation of water and soil loss situations and the like.

However, the single-machine multi-channel projection synchronization method in the prior art is difficult to synchronize, and images projected by a plurality of projectors cannot synchronously display images of the same scene in time.

Drawings

To overcome the disadvantages of the prior art, it is an object of the present invention to provide a single-machine multi-channel projection synchronization method that enables seamless display of projected images.

In order to achieve the purpose, the invention provides a single-machine multi-channel projection synchronization method, which comprises the following steps:

A. acquiring physical quantity of a display area of a screen corresponding to each channel in K channels;

B. the control machine receives the data of the image to be projected and performs data fusion correction on the image data, and then distributes the data to the projector of each display channel according to the time sequence;

C. the projector of each channel sends a feedback signal to the controller after receiving the image data sent by the controller;

D. the control machine receives the feedback signals of all the projectors and then generates control signals; then simultaneously sending the control signals to the projectors of each channel;

E. and after receiving the control signal, the projector of each channel sends out a driving signal so as to convert the received image data after fusion correction into an optical signal and project the optical signal to a corresponding display area.

Preferably, the image data is subjected to data fusion rectification, which includes:

b-1, uniformly arranging (m +1) × (n +1) control points on the network image projected by the kth projector, adjusting the coordinates of each control point to enable an observer to observe a normal perspective projection image on the projection screen, and recording the coordinate values of each control point after adjustmentWherein, a_k∈[0，1，2，...，m]，b_k∈[0，1，2，...，n]；

B-2: according to the coordinate value of each control point after adjustmentAnd constructing a deformation function Q (i, j), and deforming the image to be projected according to the function Q (i, j), wherein i and j are rows and columns of a pixel (i, j) in the image to be projected respectively.

Compared with the prior art, the single-computer multi-screen display synchronization method provided by the invention can enable the projection images to be displayed seamlessly.

Drawings

FIG. 1 is a block diagram of the components of a single-machine multi-channel projection system provided by the present invention;

FIG. 2 is a flow chart of a single-machine multi-channel projection synchronization method provided by the present invention;

FIG. 3 is a flowchart of a multi-channel data fusion correction method provided by the present invention.

Detailed Description

The invention is further described with reference to the drawings and the preferred embodiments.

FIG. 1 is a block diagram of the components of a stand-alone multi-channel system provided by the present invention; as shown in fig. l, the single-computer multi-channel system provided by the present invention comprises a control computer, a screen, and n projectors, wherein the control computer is responsible for receiving data transmitted from the network, rendering the data according to the data, and finally displaying the data through the projectors; the screen is a circular screen, an arc screen, a spherical screen and the like.

FIG. 2 is a flow chart of a single-machine multi-channel synchronization method provided by the present invention. As shown in fig. 2, the single-display multi-screen display synchronization method provided by the present invention includes:

A. acquiring physical quantity of a display area of a screen corresponding to each channel in K channels;

B. the control machine (computer) receives the data of the image to be projected and performs data fusion correction on the image data, and then distributes the data to the projector of each display channel according to the time sequence;

C. the projector of each channel sends a feedback signal to the controller after receiving the image data sent by the controller;

D. the control machine receives the feedback signals of all the projectors and then generates control signals; then simultaneously sending the control signals to the projectors of each channel;

E. and after receiving the control signal, the projector of each channel sends out a driving signal so as to convert the received image data after fusion correction into an optical signal and project the optical signal to a corresponding display area.

FIG. 3 is a flow chart of a multi-channel data fusion rectification method provided by the invention. As shown in fig. 3, the multi-channel data fusion method provided by the present invention includes:

the multichannel data fusion correction method provided by the invention comprises the following steps:

s01: with 3 projectors set up in the same horizontal plane, i.e. they form a line | A₁₁A₁₂A₁₃|

S02: dividing the projection screen into 3 regions horizontally;

s03: making a projector correspond to a region and making each projector project a grid image with equal spacing, each grid corresponding to 8 x 8 pixels;

s04: let k be 1 and k be equal to 1,

s05, uniformly arranging (m +1) × (n +1) control points on the network image projected by the kth projector, adjusting the coordinates of each control point to enable an observer to observe a normal perspective projection image on the projection screen, and recording the coordinate values of the control points after adjustmentWherein, a_k∈[0，1，2，...，m]，b_k∈[0，1，2，...，n]；

S06: according to the coordinate value of each control point after adjustmentConstructing a deformation function Q (i, j), and deforming the image to be projected according to the function Q (i, j), wherein i and j are respectively the row and the column of the pixel (i, j) in the image to be projected, and specifically:

if the resolution of one image to be projected is 3H × W, the resolution of the image to be projected by the kth projector isWherein, P is the number of columns of the overlapping area of the images to be projected of the two horizontally adjacent projectors, and the deformation function is:

$Q(i,j)=\underset{a_k=0}{\overset{m}{\mathrm{\Σ}}}\underset{b_k=0}{\overset{n}{\mathrm{\Σ}}}{P}_{a_k,b_k}{B}_{a_k}^m\left(i\right)B_{b_k}^n\left(j\right),$ wherein, $B_{a_k}^m\left(i\right)=C_m^{a_k}{\left[\frac{i}{W}\right]}^{a_k}\·{[1-\frac{i}{W}]}^{m-a_k},$ $B_{b_k}^n\left(j\right)=C_n^{b_k}{\left[\frac{j+(k-1)P}{k(H+\frac{2P}{3})}\right]}^{b_k}{\·[1-\frac{j+(k-1)P}{k(H+\frac{2P}{3})}]}^{n-b_k}$

s07: k +1 and assign k;

s08: and judging whether K is larger than K, if so, performing edge fusion, and otherwise, returning to S05. The edge fusion is carried out by adopting the following method: making the image to be projected of the 1 st projectorIs listed to the firstMultiplying the intensities of the column pixels by a fusion function f (j); second of the image to be projected corresponding to the 2 nd projectorIs listed to the firstThe luminance of the column pixels is multiplied by a fusion function 1-f (j) thIs listed to the firstMultiplying the intensities of the column pixels by a fusion function g (j); making the image to be projected of the 3 rd projector correspond toIs listed to the firstMultiplying the luminance of the column pixels by a fusion function 1-g (j);

wherein the fusion function f (j) is:

$f\left(j\right)=\left\{\begin{array}{cc}\mathrm{\α}{(2\·\frac{j-H+\frac{P}{3}}{P})}^p& H-\frac{P}{3}\≤j\≤H+\frac{P}{6}\\ 1-\mathrm{\α}{\left[2(1-\frac{j-H+\frac{P}{3}}{P})\right]}^p& H+\frac{P}{6}\≤j\≤H+\frac{2P}{3}\end{array}\right.,$

the fusion function g (j) is:

$g\left(j\right)=\left\{\begin{array}{cc}\mathrm{\α}{(2\·\frac{j-2H+\frac{2P}{3}}{P})}^p& 2H-\frac{2P}{3}\≤j\≤2H-\frac{P}{6}\\ 1-\mathrm{\α}{\left[2(1-\frac{j-2H+\frac{2P}{3}}{P})\right]}^p& 2H+\frac{P}{6}\≤j\≤2H+\frac{P}{3}\end{array}\right.$

wherein alpha is a brightness adjusting coefficient, alpha belongs to [0, 1], and p is an influence factor which is a positive integer.

Preferably, m is 3 and n is 3.

Although the present invention has been described by taking an example in which 3 projectors are horizontally arranged, two or more projectors may be vertically arranged, and when two projectors are vertically arranged, the multi-channel data fusion method includes:

s01: with 2 projectors in the same vertical plane, i.e. they form two rows $\left|\begin{array}{c}{A}_{11}\\ A_{21}\end{array}\right|$

S02: vertically dividing a projection screen into 2 regions;

s03: making a projector correspond to a region and making each projector project a grid image with equal spacing, each grid corresponding to 8 x 8 pixels;

s04: let k be 1 and k be equal to 1,

s05, uniformly arranging (m +1) × (n +1) control points on the network image projected by the kth projector, adjusting the coordinates of each control point to enable an observer to observe a normal perspective projection image on the projection screen, and recording the coordinate values of the control points after adjustmentWherein, a_k∈[0，1，2，...，m]，b_k∈[0，1，2，...，n]；

S06: according to the coordinate value of each control point after adjustmentConstructing a deformation function Q (i, j), and deforming the image to be projected according to the function Q (i, j), wherein i and j are respectively the row and the column of the pixel (i, j) in the image to be projected, and specifically:

if the resolution of one image to be projected is H × 2W, the resolution of the image to be projected by the kth projector is H × WWherein R is the line number of the overlapping area of the images to be projected of the two adjacent projectors;

transforming the coordinates (i, j) of the pixel located in the ith row and j column into Q (i, j) by using the following formula:

$Q(i,j)=\underset{a_k=0}{\overset{m}{\mathrm{\Σ}}}\underset{b_k=0}{\overset{n}{\mathrm{\Σ}}}{P}_{a_k,b_k}{B}_{a_k}^m\left(i\right)B_{b_k}^n\left(j\right),$ wherein,

$B_{a_k}^m\left(i\right)=C_m^{a_k}{\left[\frac{i+(k-1)R}{k(W+\frac{R}{2})}\right]}^{a_k}\·{[1-\frac{i+(k-1)R}{k(W+\frac{R}{2})}]}^{m-a_k},B_{b_k}^n\left(j\right)=C_n^{b_k}{\left[\frac{j}{H}\right]}^{b_k}\·{[1-\frac{j}{H}]}^{n-b_k};$

s07: k +1 and assign k;

s08: judging whether k is larger than 2, if so, performing edge fusion, otherwise, returning to S05;

the edge blending adopts the following methodCarrying out the following steps: making the projection image corresponding to the 1 st projectorTo the firstMultiplying the luminance of the row pixels by a fusion function h (i);

make the second image corresponding to the 2 nd projector to be projectedTo the firstMultiplying the luminance of the row pixels by a fusion function 1-h (i);

the fusion function h (i) is:

$h\left(i\right)=\left\{\begin{array}{cc}\mathrm{\α}{(2\·\frac{i-W+\frac{R}{2}}{R})}^p& W-\frac{R}{2}\≤i\≤W\\ 1-\mathrm{\α}{\left[2(1-\frac{i-H+\frac{R}{2}}{R})\right]}^p& W\≤i\≤W+\frac{R}{2}\end{array}\right.$

wherein alpha is a brightness adjusting coefficient, alpha belongs to [0, 1], and p is an influence factor which is a positive integer.

The invention can also be provided with six projectors, the six projectors are arranged into two rows and three columns so as to adapt to more complex projection screens such as a spherical screen, and the multi-channel data fusion method comprises the following steps:

s01: having six projectors in two rows and three columns, i.e. $\left|\begin{array}{ccc}{A}_{11}& A_{12}& A_{13}\\ A_{21}& A_{22}& A_{23}\end{array}\right|$

S02: dividing the projection screen into 6 regions;

s03: making a projector correspond to a region and making each projector project a grid image with equal spacing, each grid corresponding to 8 x 8 pixels;

s04: let k be 1 and k be equal to 1,

s05, uniformly arranging (m +1) × (n +1) control points on the network image projected by the kth projector, adjusting the coordinates of each control point to enable an observer to observe a normal perspective projection image on the projection screen, and recording the coordinate values of the control points after adjustmentWherein, a_k∈[0，1，2，...，m]，b_k∈[0，1，2，...，n]；

S06: according to the coordinate value of each control point after adjustmentConstructing a deformation function Q (i, j), and deforming the image to be projected according to the function Q (i, j), wherein i and j are respectively the row and the column of the pixel (i, j) in the image to be projected, and specifically:

if the resolution of one image to be projected is 3H × 2W, the resolution of the image to be projected by the kth projector isWherein R is the line number of the overlapping area of the images to be projected of the two adjacent projectors; p is the number of columns of the overlapping area of the images to be projected of the two horizontally adjacent projectors;

transforming the coordinates (i, j) of the pixel located in the ith row and j column into Q (i, j) by using the following formula:

$Q(i,j)=\underset{a_k=0}{\overset{m}{\mathrm{\Σ}}}\underset{b_k=0}{\overset{n}{\mathrm{\Σ}}}{P}_{a_k,b_k}{B}_{a_k}^m\left(i\right)B_{b_k}^n\left(j\right),$ wherein,

$B_{a_k}^m\left(i\right)=C_m^{a_k}{\left[\frac{i+(k-1)R}{k(W+\frac{R}{2})}\right]}^{a_k}\·{[1-\frac{i+(k-1)R}{k(W+\frac{R}{2})}]}^{m-a_k},$

$B_{b_k}^n\left(j\right)=C_n^{b_k}{\left[\frac{j+(k-1)P}{k(H+\frac{2P}{3})}\right]}^{b_k}{\·[1-\frac{j+(k-1)P}{k(H+\frac{2P}{3})}]}^{n-b_k};$

s07: k +1 and assign k;

s08: judging whether k is larger than 6, if so, performing edge fusion, otherwise, returning to S05;

the edge fusion is carried out by adopting the following method: corresponding to the 1 st projector A₁₁Of the projected imageTo the firstMultiplying the luminance of the row pixels by a fusion function h (i); first, theTo the firstMultiplying the intensities of the column pixels by a fusion function f (j);

corresponding to the 4 th projector A₂₁To be projected of an imageTo the firstMultiplying the luminance of the row pixels by a fusion function 1-h (i); first, theTo the firstThe luminance of the column pixels is multiplied by the fusion function f (j).

Corresponding to the 2 nd projector A₁₂Of the projected imageFirst, theTo the firstMultiplying the luminance of the row pixels by a fusion function h (i); first, theTo the firstMultiplying the luminance of the column pixels by a fusion function 1-f (j); first, theTo the firstMultiplying the intensities of the column pixels by a fusion function g (j);

corresponding to the 5 th projector A₂₂To be projected of an imageTo the firstMultiplying the luminance of the row pixels by a fusion function 1-h (i); first, theTo the firstMultiplying the luminance of the column pixels by a fusion function 1-f (j); first, theTo the firstThe luminance of the column pixels is multiplied by the fusion function g (j).

Corresponding to the 3 rd projector A₁₃Of the projected imageTo the firstMultiplying the luminance of the row pixels by a fusion function h (i); first, theTo the firstMultiplying the luminance of the column pixels by a fusion function 1-g (j);

corresponding to the 6 th projector A₂₃To project image ofTo the firstMultiplying the luminance of the row pixels by a fusion function 1-h (i); first, theTo the firstMultiplying the luminance of the column pixels by a fusion function 1-g (j);

the fusion function f (j) is:

$f\left(j\right)=\left\{\begin{array}{cc}\mathrm{\α}{(2\·\frac{j-H+\frac{P}{3}}{P})}^p& H-\frac{P}{3}\≤j\≤H+\frac{P}{6}\\ 1-\mathrm{\α}{\left[2(1-\frac{j-H+\frac{P}{3}}{P})\right]}^p& H+\frac{P}{6}\≤j\≤H+\frac{2P}{3}\end{array}\right.,$

the fusion function g (j) is

$g\left(j\right)=\left\{\begin{array}{cc}\mathrm{\α}{(2\·\frac{j-2H+\frac{2P}{3}}{P})}^p& 2H-\frac{2P}{3}\≤j\≤2H-\frac{P}{6}\\ 1-\mathrm{\α}{\left[2(1-\frac{j-2H+\frac{2P}{3}}{P})\right]}^p& 2H+\frac{P}{6}\≤j\≤2H+\frac{P}{3}\end{array}\right.$

The fusion function h (i) is:

$h\left(i\right)=\left\{\begin{array}{cc}\mathrm{\α}{(2\·\frac{i-W+\frac{R}{2}}{R})}^p& W-\frac{R}{2}\≤i\≤W\\ 1-\mathrm{\α}{\left[2(1-\frac{i-H+\frac{R}{2}}{R})\right]}^p& W\≤i\≤W+\frac{R}{2}\end{array}\right.$

wherein alpha is a brightness adjusting coefficient, alpha belongs to [0, 1], and p is an influence factor which is a positive integer.

Although the present invention has been described with three projectors horizontally, two projectors vertically, and 6 projectors in two rows and three columns, the present invention is not limited to these cases, and a plurality of projectors may be arranged in a matrix to accommodate different projection screens.

The present invention has been described in detail with reference to the accompanying drawings, but the invention should not be considered limited to the specific embodiments described above, but rather should be understood to cover all aspects of the invention as set out in the attached claims. Various modifications, equivalent processes, as well as numerous structures to which the present invention may be applicable will be readily apparent to those of skill in the art to which the present invention is directed upon review of the instant specification.

Claims (1)

1. A single machine six-channel projection synchronization method comprises the following steps:

A. acquiring physical quantity of a display area of a screen corresponding to each channel in six channels;

B. the control machine receives the data of the image to be projected and performs data fusion correction on the image data, and then distributes the data to the projector of each display channel according to the time sequence;

C. the projector of each channel sends a feedback signal to the controller after receiving the image data sent by the controller;

D. the control machine receives the feedback signals of all the projectors and then generates control signals; then simultaneously sending the control signals to the projectors of each channel;

E. after receiving the control signal, the projector of each channel sends a driving signal to convert the received image data after fusion correction into an optical signal and project the optical signal to a corresponding display area, wherein the data fusion correction of the image data comprises the following steps:

s01: making six projectors form two rows and three columns;

s02: dividing the projection screen into 6 regions;

s03: causing a projector to correspond to an area and causing each projector to project an equally spaced grid image;

s04: let k equal to 1;

s05, uniformly arranging (m +1) × (n +1) control points on the network image projected by the kth projector, adjusting the coordinates of each control point to enable an observer to observe a normal perspective projection image on the projection screen, and recording the coordinate values of the control points after adjustmentWherein, a_k∈[0，1，2，...，m]，b_k∈[0，1，2，...，n]；

S06: according to the coordinate value of each control point after adjustmentConstructing a deformation function Q (i, j), and deforming the image to be projected according to the function Q (i, j), wherein i and j are rows and columns of a pixel (i, j) in the image to be projected respectively, and specifically:

if the resolution of one image to be projected is 3H × 2W, the resolution of the image to be projected by the kth projector isWherein R is the line number of the overlapping area of the images to be projected of the two adjacent projectors; p is the number of columns of the overlapping area of the images to be projected of the two horizontally adjacent projectors;

the coordinates of the pixel (i, j) located in the ith row and j column are transformed into Q (i, j) using the following equation:

$Q(i,j)=\underset{a_k=0}{\overset{m}{\Σ}}\underset{b_k=0}{\overset{n}{\Σ}}{P}_{a_k,b_k}{B}_{a_k}^m\left(i\right)B_{b_k}^n\left(j\right),$ wherein,

$B_{a_k}^m\left(i\right)=C_m^{a_k}{\[\frac{i+(k-1)R}{k(W+\frac{R}{2})}\]}^{a_k}\·{\[1-\frac{i+(k-1)R}{k(W+\frac{R}{2})}\]}^{m-a_k},$

$B_{b_k}^n\left(j\right)=C_n^{b_k}{\[\frac{j+(k-1)P}{k(H+\frac{2P}{3})}\]}^{b_k}\·{\[1-\frac{j+(k-1)P}{k(H+\frac{2P}{3})}\]}^{n-b_k};$

s07: k +1 and assign k;

s08: and judging whether k is larger than 6, if so, performing edge fusion, and otherwise, returning to the step S05.