CN101556758A - Method for realizing displaying of high dynamic luminance range images by a plurality of projecting cameras - Google Patents

Abstract

The invention discloses a method for realizing the displaying of high dynamic luminance range images by a plurality of projecting cameras. The method comprises the following steps: firstly, the position, the projecting angle and the display size of each projecting camera is adjusted to ensure that the projection display regions of all the projecting cameras on a screen have an overlap region; secondly, all sub controllers synchronistically receive high dynamic luminance range images, conducting coordinate conversion and color conversion on each pixel of the received images, and then synchronistically transmitting the processed images to the controlled projecting cameras; thirdly, a main controller is used for controlling all the sub controllers to synchronously receive the high dynamic luminance range images, and synchronously transmit the processed images to the controlled projecting cameras. The method has the advantages that the projecting lumen and the projecting luminance contrast can be improved, the black level can be better shown, and HDR images can be displayed by projecting, namely, the color value which exceeds the common range (0 to 255) can be displayed by projecting so as to ensure that the projecting image is full of sense of reality on the aspects of deepness, detail and color and the like.

Description

A kind of method that realizes showing high dynamic brightness range image with many projectors

Technical field

The present invention relates to a kind of method that shows high dynamic brightness range image, relate in particular to a kind of method that realizes showing high dynamic brightness range image with many projectors.

Background technology

Projector's development since coming out has formed three big series so far: liquid crystal display (Liquid CrystalDisplay, LCD) projector, digital light are handled (Digital Lighting Process, DLP) projector and cathode-ray tube (CRT) (Cathode Ray Tube, CRT) projector.These projectors are not only undertaking and are continuing to improve the lumen degree of projection and the important task of luminance contrast, but also can not the high dynamic brightness range image of Projection Display.High dynamic brightness range image is the HDR image, and HDR is the abbreviation of High-Dynamic Range.

Summary of the invention

The objective of the invention is at the deficiencies in the prior art, promptly projector can not the high dynamic brightness range image of Projection Display, proposes a kind of method that realizes showing with many projectors high dynamic brightness range image.

Realize showing that with many projectors the method for high dynamic brightness range image may further comprise the steps:

1) position, input angle, the demonstration size by adjusting every projector makes the Projection Display zone of all projectors on screen have the overlapping region;

2) be that each projector distributes a sub-controller, on every sub-controller, an image pixel point coordinate conversion look-up table that obtains in advance and three colour switching look-up tables of red, green, blue arranged all; All sub-controllers can synchronously receive high dynamic brightness range image, and each pixel on the high dynamic brightness range image that receives is done coordinate transform and colour switching according to image pixel point coordinate conversion look-up table and colour switching look-up table, the image after projector's transmission process of being controlled synchronously then, this image will be projected the machine projection;

3) control all sub-controllers with a master controller, master controller is controlled all sub-controllers and is synchronously received high dynamic brightness range image, and controls the synchronously image after its processing is transmitted in the projector of its control of all sub-controllers.

The list item of image pixel point coordinate conversion look-up table described step 2) is one two tuple, first value of list item is key value, the coordinate of recording pixel point on high dynamic brightness range image, second value of list item is table output valve, the coordinate of recording pixel point on projector's projected image that sub-controller is controlled.

The attribute of image pixel point coordinate conversion look-up table described step 2) is: it has write down the coordinate of pixel on high dynamic brightness range image and the affine maps relation of the coordinate of pixel on projector's projected image; This affine maps relation must satisfy following the requirement: note coordinate of any one pixel on high dynamic brightness range image is P, on the sub-controller of i platform projector, it is done coordinate transform, and obtaining its coordinate on projected image is P _i, 1≤i≤N, N are the platform number of projector, this N some P _iAfter being projected the machine projection, must on screen, overlap.

The list item of three colour switching look-up tables of red, green, blue described step 2) is one two tuples, first value of list item is key value, write down the color component value on the high dynamic brightness range image, span exceeds 0～255 scope, second value of list item is the table output valve, be recorded in the color component value on projector's projected image that sub-controller controls, span does not exceed 0～255 scope.

The attribute of three colour switching look-up tables of red, green, blue described step 2) is: the key value span of three colour switching look-up tables of note red, green, blue all is I _HDR ^Min～I _HDR ^Max, in this span, get a red color component value r arbitrarily ^Key, key value r in the red conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is r _i ^Out, in this span, get a green component values g arbitrarily ^Key, key value g in the green conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is g _i ^Out, in this span, get a blue component value b arbitrarily ^Key, key value b in the blue conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is b _i ^Out, 1≤i≤N wherein, N is the platform number of projector, they must satisfy following condition:

With r ^KeyIncrease progressively and increase progressively, With g ^KeyIncrease progressively and increase progressively,

With b ^KeyIncrease progressively and increase progressively.

Described step 2) according to image pixel point coordinate conversion look-up table and colour switching look-up table each pixel on the high dynamic brightness range image that receives is done coordinate transform and colour switching step: at certain pixel of high dynamic brightness range image, its coordinate on high dynamic brightness range image is designated as P, in image pixel point coordinate conversion look-up table, search the list item that a key value equals P, the output valve of remembering this list item is P ', and current pixel is moved on the coordinate P '; Then, sub-controller is done value transform according to the colour switching look-up table to three color components of current pixel, and the conversion of three color components is separate, and each color component is all done the value transform of respective color component according to the look-up table of oneself; The method of red component conversion is as follows: the red color component value at current pixel is designated as r ^Key, in red conversion look-up table, search a key value and equal r ^KeyList item, the output valve of remembering this list item is r ^Out, r ^OutAssignment is given the red component of current pixel; The method of green component conversion is as follows: the green component values at current pixel is designated as g ^Key, in green conversion look-up table, search a key value and equal g ^KeyList item, the output valve of remembering this list item is g ^Out, g ^OutAssignment is given the green component of current pixel; The method of blue component conversion is as follows: the blue component value at current pixel is designated as b ^Key, in blue conversion look-up table, search a key value and equal b ^KeyList item, the output valve of remembering this list item is b ^Out, b ^OutAssignment is given the blue component of current pixel.

Master controller of the usefulness of described step 3) is controlled all sub-controllers, master controller is controlled all sub-controllers and is synchronously received high dynamic brightness range image, and controls the synchronously image step after its processing is transmitted in the projector of its control of all sub-controllers:

A) master controller is carried high dynamic brightness range image to all sub-controllers simultaneously, enters waiting status then, waits for the feedback of sub-controller;

B) sub-controller is after receiving high dynamic brightness range image, according to image pixel point coordinate conversion look-up table and colour switching look-up table each pixel on the high dynamic brightness range image is done coordinate transform and colour switching, send the feedback of finishing Flame Image Process to master controller then;

C) master controller is after receiving the feedback of all sub-controllers, sends order to all sub-controllers---and send the image of conversion gained to its projector that controls, wait for that then sub-controller finishes the feedback that image sends;

D) sub-controller sends to master controller then and finishes the feedback information that image sends, and wait for the high dynamic brightness range image that reception is new to the image that the projector that is controlled sends the conversion gained;

E) master controller is got back to step a), the control flow of a beginning new round receiving after all sub-controllers finish the feedback information that image sends.

The present invention can obviously improve the lumen degree of projection, the luminance contrast of projection can show the black level well, energy Projection Display HDR image, can Projection Display exceed the color value of common scope 0～255, make the picture of projection all show trulyr at aspects such as the degree of depth, details, colors.

Description of drawings

Accompanying drawing is the total arrangement that shows high dynamic brightness range image with two projectors.

Embodiment

The present invention will be further described below in conjunction with drawings and embodiments.

Realize showing that with many projectors the method for high dynamic brightness range image may further comprise the steps:

1) position, input angle, the demonstration size by adjusting every projector makes the Projection Display zone of all projectors on screen have the overlapping region;

Put a video camera then, can take down projector fully and be projected in picture on the screen.After fixing video camera and adjusting focal length, position, the visual angle of video camera are immutable, and focal length is immutable.

Take a photo with video camera about the Projection Display zone of all projectors on screen, on photo, sketch the contours of then and will show the zone of high dynamic brightness range image, be designated as the HDR zone, the HDR zone does not exceed the overlapping region in the Projection Display zone of all projectors.

2) be that each projector distributes a sub-controller, on every sub-controller, an image pixel point coordinate conversion look-up table that obtains in advance and three colour switching look-up tables of red, green, blue arranged all; All sub-controllers can synchronously receive high dynamic brightness range image, and each pixel on the high dynamic brightness range image that receives is done coordinate transform and colour switching according to image pixel point coordinate conversion look-up table and colour switching look-up table, the image after projector's transmission process of being controlled synchronously then, this image will be projected the machine projection;

3) control all sub-controllers with a master controller, master controller is controlled all sub-controllers and is synchronously received high dynamic brightness range image, and controls the synchronously image after its processing is transmitted in the projector of its control of all sub-controllers.

The implementation of sub-controller and master controller has a variety of, as computing machine, single-chip microcomputer etc.Sub-controller and master controller are realized that by computing machine accompanying drawing has shown the total arrangement that shows high dynamic brightness range image with two projectors in this concrete enforcement, and 1,2 is projector, and 3,4 is sub-controller, and 5 is master controller.

The list item of image pixel point coordinate conversion look-up table described step 2) is one two tuple, first value of list item is key value, the coordinate of recording pixel point on high dynamic brightness range image, second value of list item is table output valve, the coordinate of recording pixel point on projector's projected image that sub-controller is controlled.

The attribute of image pixel point coordinate conversion look-up table described step 2) is: it has write down the coordinate of pixel on high dynamic brightness range image and the affine maps relation of the coordinate of pixel on projector's projected image; This affine maps relation must satisfy following the requirement: note coordinate of any one pixel on high dynamic brightness range image is P, on the sub-controller of i platform projector, it is done coordinate transform, and obtaining its coordinate on projected image is P _i, 1≤i≤N, N are the platform number of projector, this N some P _iAfter each projector throws in, must on screen, overlap.

The acquisition methods of image pixel point coordinate conversion look-up table has a variety of, and wherein a kind of concrete method is as follows:

A) obtain pixel the coordinate on the HDR image to this video camera take the mapping relations of the coordinate on the photo

The coordinate of note pixel on the HDR image is m _HDR---(x, y), pixel is taken to such an extent that the coordinate on the photo is m at video camera _CAM---(u, v), pixel is taken to such an extent that the mapping relations of coordinate photo on be: m to this at video camera at the coordinate on the HDR image _CAM=A (m _HDR), A is an affine maps relation.

Below for asking for the concrete grammar of mapping relations A:

I. get equably a little on the HDR image, their coordinate is designated as (x _p, y _q), 1≤p≤m, 1≤q≤n;

Ii. adopt and the same method of i step, get the point of as much in the HDR viewing area on screen equably, and on screen these points of mark, take photo then, obtain these coordinates on photo, be designated as (u _p, v _q), 1≤p≤m, 1≤q≤n;

Iii., one group of (u is arranged now _p, v _q) coordinate, one group of (x _p, y _q) coordinate, then point on the HDR image (x, y) on photo corresponding point (u, the formula of asking for v) is:

$u=\frac{(x-x_{p-1})(u_p-u_{p-1})}{x_p-x_{p-1}}$

$v=\frac{(y-y_{q-1})(v_q-v_{q-1})}{y_q-y_{q-1}}$

X wherein _P-1≤ x＜x _p, y _Q-1≤ y＜y _q, 1≤p≤m, 1≤q≤n.

B) obtain pixel video camera take the coordinate on the photo to the mapping relations of this coordinate on each projector's projected image

Description according to the 2.3.1 trifle of the master thesis " the automatic splicing and the realization of multi-projector system " of Feng Jinghua can obtain mapping relations: m _{PRJ (i)}=B _{PRJ (i)}(m _CAM), m wherein _{PRJ (i)}Be " point coordinate in the projector space " that be the coordinate of pixel on the image that is about to be projected in the i platform projector on the HDR image, 1≤i≤N, N are the platform number of projector, m _CAMBe " pixel thrown into curtain go up taken by video camera after, at the coordinate of image space ", be pixel video camera take the coordinate on the photo, B _{PRJ (i)}Be expressed as m _CAMAnd m _{PRJ (i)}Between mapping relations.

C) the coordinate Mapping relation of establishing according to first two steps, the key value of setting up image pixel point coordinate conversion look-up table image pixel point coordinate conversion look-up table list item is the coordinate m of pixel on the HDR image _HDR, output valve is for controlling the coordinate m on projector's projected image at sub-controller _{PRJ (i)}, be designated as $m_{\mathrm{PRJ}\left(i\right)}={\mathrm{LUT}}_{\mathrm{PRJ}\left(i\right)}^{\mathrm{coord}}\left(m_{\mathrm{HDR}}\right),$ 1≤i≤N wherein, N is the platform number of projector.According to a), b) step obtains: $m_{\mathrm{PFJ}\left(i\right)}={\mathrm{LUT}}_{\mathrm{PRJ}\left(i\right)}^{\mathrm{coord}}\left(m_{\mathrm{HDR}}\right)=B_{\mathrm{PRJ}\left(i\right)}\left(A\left(m_{\mathrm{HDR}}\right)\right).$

The list item of three colour switching look-up tables of red, green, blue described step 2) is one two tuples, first value of list item is key value, write down the color component value on the high dynamic brightness range image, span exceeds 0～255 scope, second value of list item is the table output valve, be recorded in the color component value on projector's projected image that sub-controller controls, span does not exceed 0～255 scope.

The attribute of three colour switching look-up tables of red, green, blue described step 2) is: the key value span of three colour switching look-up tables of note red, green, blue all is I _HDR ^Min～I _HDR ^Max, in this span, get a red color component value r arbitrarily ^Key, key value r in the red conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is r _i ^Out, in this span, get a green component values g arbitrarily ^Key, key value g in the green conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is g _i ^Out, in this span, get a blue component value b arbitrarily ^Key, key value b in the blue conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is b _i ^Out, 1≤i≤N wherein, N is the platform number of projector, they must satisfy following condition:

With r ^KeyIncrease progressively and increase progressively, With g ^KeyIncrease progressively and increase progressively, With b ^KeyIncrease progressively and increase progressively.

Described step 2) limit is done coordinate transform and colour switching step according to image pixel point coordinate conversion look-up table and colour switching look-up table to each pixel on the high dynamic brightness range image that receives: at certain pixel of high dynamic brightness range image, its coordinate on high dynamic brightness range image is designated as P, in image pixel point coordinate conversion look-up table, search the list item that a key value equals P, the output valve of remembering this list item is P ', and current pixel is moved on the coordinate P '; Then, sub-controller is done value transform according to the colour switching look-up table to three color components of current pixel, and the conversion of three color components is separate, and each color component is all done the value transform of respective color component according to the look-up table of oneself; The method of red component conversion is as follows: the red color component value at current pixel is designated as r ^Key, in red conversion look-up table, search a key value and equal r ^KeyList item, the output valve of remembering this list item is r ^Out, r ^OutAssignment is given the red component of current pixel; The method of green component conversion is as follows: the green component values at current pixel is designated as g ^Key, in green conversion look-up table, search a key value and equal g ^KeyList item, the output valve of remembering this list item is g ^Out, g ^OutAssignment is given the green component of current pixel; The method of blue component conversion is as follows: the blue component value at current pixel is designated as b ^Key, in blue conversion look-up table, search a key value and equal b ^KeyList item, the output valve of remembering this list item is b ^Out, b ^OutAssignment is given the blue component of current pixel.

The acquisition methods of colour switching look-up table has a variety of, and described below is wherein a kind of concrete grammar.Because the acquisition methods basically identical of the colour switching look-up table of three color components, thus following do description at a color component.Its concrete steps are as follows:

Certain color component on the note HDR image is I _HDR, I _HDRSpan be [I _HDR ^Min, I _HDR ^Max]; The platform number of projector is N, and certain color component value on the projected image of i platform projector is I _{PRJ (i)}, 1≤i≤N wherein.

A) obtain earlier from interval [I _HDR ^Min, I _HDR ^Max] mapping relations in interval [0,255N] remember that these mapping relations are L _HDR, I _HDRThe formula of asking for of the mapping value on interval [0,255N] is:

$L_{\mathrm{HDR}}\left(I_{\mathrm{HDR}}\right)=\frac{I_{\mathrm{HDR}}-I_{\mathrm{HDR}}^{\min }}{I_{\mathrm{HDR}}^{\max }-I_{\mathrm{HDR}}^{\min }}\×255N.$

B) obtain the colour switching look-up table of each sub-controller

The key value of colour switching look-up table list item is the color component value I on the HDR image _HDR, output valve is for controlling the respective color component value I on projector's projected image at sub-controller _{PRJ (i)}, be designated as $I_{\mathrm{PRJ}\left(i\right)}={\mathrm{LUT}}_{\mathrm{PRJ}\left(i\right)}^{\mathrm{color}}\left(I_{\mathrm{HDR}}\right),$ 1≤i≤N wherein.

Below for asking for $I_{\mathrm{PRJ}\left(i\right)}={\mathrm{LUT}}_{\mathrm{PRJ}\left(i\right)}^{\mathrm{color}}\left(I_{\mathrm{HDR}}\right)$ Method:

Work as L _HDR(I _HDRDuring)≤255 * (i-1), ${\mathrm{LUT}}_{\mathrm{PRJ}\left(i\right)}^{\mathrm{color}}\left(I_{\mathrm{HDR}}\right)=0;$

Work as L _HDR(I _HDRDuring) 〉=255i, ${\mathrm{LUT}}_{\mathrm{PRJ}\left(i\right)}^{\mathrm{color}}\left(I_{\mathrm{HDR}}\right)=255;$

As 255 * (i-1)＜L _HDR(I _HDRDuring)＜255i, ${\mathrm{LUT}}_{\mathrm{PRJ}\left(i\right)}^{\mathrm{color}}\left(I_{\mathrm{HDR}}\right)=L_{\mathrm{HDR}}\left(I_{\mathrm{HDR}}\right)-255\×(i-1).$

Master controller of the usefulness of described step 3) is controlled all sub-controllers, master controller is controlled all sub-controllers and is synchronously received high dynamic brightness range image, and controls the synchronously image step after its processing is transmitted in the projector of its control of all sub-controllers:

A) master controller is carried high dynamic brightness range image to all sub-controllers simultaneously, enters waiting status then, waits for the feedback of sub-controller;

B) sub-controller is after receiving high dynamic brightness range image, according to image pixel point coordinate conversion look-up table and colour switching look-up table each pixel on the high dynamic brightness range image is done coordinate transform and colour switching, send the feedback of finishing Flame Image Process to master controller then;

C) master controller is after receiving the feedback of all sub-controllers, sends order to all sub-controllers---and send the image of conversion gained to its projector that controls, wait for that then sub-controller finishes the feedback that image sends;

D) sub-controller sends to master controller then and finishes the feedback information that image sends, and wait for the high dynamic brightness range image that reception is new to the image that the projector that is controlled sends the conversion gained;

E) master controller is got back to step a), the control flow of a beginning new round receiving after all sub-controllers finish the feedback information that image sends.

Claims (7)

1, a kind of method that realizes showing with many projectors high dynamic brightness range image is characterized in that may further comprise the steps:

1) position, input angle, the demonstration size by adjusting every projector makes the Projection Display zone of all projectors on screen have the overlapping region;

2) be that each projector distributes a sub-controller, on every sub-controller, an image pixel point coordinate conversion look-up table that obtains in advance and three colour switching look-up tables of red, green, blue arranged all; All sub-controllers can synchronously receive high dynamic brightness range image, and each pixel on the high dynamic brightness range image that receives is done coordinate transform and colour switching according to image pixel point coordinate conversion look-up table and colour switching look-up table, the image after projector's transmission process of being controlled synchronously then, this image will be projected the machine projection;

3) control all sub-controllers with a master controller, master controller is controlled all sub-controllers and is synchronously received high dynamic brightness range image, and controls the synchronously image after its processing is transmitted in the projector of its control of all sub-controllers.

2, a kind of method that realizes showing high dynamic brightness range image according to claim 1 with many projectors, it is characterized in that: the list item of image pixel point coordinate conversion look-up table described step 2) is one two tuple, first value of list item is key value, the coordinate of recording pixel point on high dynamic brightness range image, second value of list item is table output valve, the coordinate of recording pixel point on projector's projected image that sub-controller is controlled.

3, a kind of method that realizes showing with many projectors high dynamic brightness range image according to claim 1 is characterized in that: the attribute of image pixel point coordinate conversion look-up table described step 2) is: it has write down the coordinate of pixel on high dynamic brightness range image and the affine maps relation of the coordinate of pixel on projector's projected image; This affine maps relation must satisfy following the requirement: note coordinate of any one pixel on high dynamic brightness range image is P, on the sub-controller of i platform projector, it is done coordinate transform, and obtaining its coordinate on projected image is P _i, 1≤i≤N, N are the platform number of projector, this N some P _iAfter being projected the machine projection, must on screen, overlap.

4, a kind of method that realizes showing high dynamic brightness range image according to claim 1 with many projectors, it is characterized in that: the list item of three colour switching look-up tables of red, green, blue described step 2) is one two tuples, first value of list item is key value, write down the color component value on the high dynamic brightness range image, span exceeds 0～255 scope, second value of list item is the table output valve, be recorded in the color component value on projector's projected image that sub-controller controls, span does not exceed 0～255 scope.

5, a kind of method that realizes showing with many projectors high dynamic brightness range image according to claim 1 is characterized in that: the attribute of three colour switching look-up tables of red, green, blue described step 2) is: the key value span of three colour switching look-up tables of note red, green, blue all is I _HDR ^Min～I _HDR ^Max, in this span, get a red color component value r arbitrarily ^Key, key value r in the red conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is r _i ^Out, in this span, get a green component values g arbitrarily ^Key, key value g in the green conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is g _i ^Out, in this span, get a blue component value b arbitrarily ^Key, key value b in the blue conversion look-up table on the i platform sub-controller ^KeyCorresponding output valve is b _i ^Out, 1≤i≤N wherein, N is the platform number of projector, they must satisfy following condition:

With r ^KeyIncrease progressively and increase progressively,

With g ^KeyIncrease progressively and increase progressively,

With b ^KeyIncrease progressively and increase progressively.

6, a kind of method that realizes showing high dynamic brightness range image according to claim 1 with many projectors, it is characterized in that described step 2) according to image pixel point coordinate conversion look-up table and colour switching look-up table each pixel on the high dynamic brightness range image that receives is done coordinate transform and colour switching step: at certain pixel of high dynamic brightness range image, its coordinate on high dynamic brightness range image is designated as P, in image pixel point coordinate conversion look-up table, search the list item that a key value equals P, the output valve of remembering this list item is P ', and current pixel is moved on the coordinate P '; Then, sub-controller is done value transform according to the colour switching look-up table to three color components of current pixel, and the conversion of three color components is separate, and each color component is all done the value transform of respective color component according to the look-up table of oneself; The method of red component conversion is as follows: the red color component value at current pixel is designated as r ^Key, in red conversion look-up table, search a key value and equal r ^KeyList item, the output valve of remembering this list item is r ^Out, r ^OutAssignment is given the red component of current pixel; The method of green component conversion is as follows: the green component values at current pixel is designated as g ^Key, in green conversion look-up table, search a key value and equal g ^KeyList item, the output valve of remembering this list item is g ^Out, g ^OutAssignment is given the green component of current pixel; The method of blue component conversion is as follows: the blue component value at current pixel is designated as b ^Key, in blue conversion look-up table, search a key value and equal b ^KeyList item, the output valve of remembering this list item is b ^Out, b ^OutAssignment is given the blue component of current pixel.

7, a kind of method that realizes showing high dynamic brightness range image according to claim 1 with many projectors, the master controller of usefulness that it is characterized in that described step 3) is controlled all sub-controllers, master controller is controlled all sub-controllers and is synchronously received high dynamic brightness range image, and controls the synchronously image step after its processing is transmitted in the projector of its control of all sub-controllers:

A) master controller is carried high dynamic brightness range image to all sub-controllers simultaneously, enters waiting status then, waits for the feedback of sub-controller;

B) sub-controller is after receiving high dynamic brightness range image, according to image pixel point coordinate conversion look-up table and colour switching look-up table each pixel on the high dynamic brightness range image is done coordinate transform and colour switching, send the feedback of finishing Flame Image Process to master controller then;

C) master controller is after receiving the feedback of all sub-controllers, sends order to all sub-controllers---and send the image of conversion gained to its projector that controls, wait for that then sub-controller finishes the feedback that image sends;

D) sub-controller sends to master controller then and finishes the feedback information that image sends, and wait for the high dynamic brightness range image that reception is new to the image that the projector that is controlled sends the conversion gained;

E) master controller is got back to step a), the control flow of a beginning new round receiving after all sub-controllers finish the feedback information that image sends.