KR101681751B1 - Image synchronizing system for projectors and operation method thereof - Google Patents

Image synchronizing system for projectors and operation method thereof Download PDF

Info

Publication number
KR101681751B1
KR101681751B1 KR1020150041694A KR20150041694A KR101681751B1 KR 101681751 B1 KR101681751 B1 KR 101681751B1 KR 1020150041694 A KR1020150041694 A KR 1020150041694A KR 20150041694 A KR20150041694 A KR 20150041694A KR 101681751 B1 KR101681751 B1 KR 101681751B1
Authority
KR
South Korea
Prior art keywords
image
synchronization
image processing
image data
reference clock
Prior art date
Application number
KR1020150041694A
Other languages
Korean (ko)
Other versions
KR20160116108A (en
Inventor
정희영
주민형
Original Assignee
정희영
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 정희영 filed Critical 정희영
Priority to KR1020150041694A priority Critical patent/KR101681751B1/en
Publication of KR20160116108A publication Critical patent/KR20160116108A/en
Application granted granted Critical
Publication of KR101681751B1 publication Critical patent/KR101681751B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Projection Apparatus (AREA)

Abstract

According to an embodiment of the present invention, an image synchronization system for a projector and an operation method thereof are disclosed. The system comprising: an image synchronization device for transmitting a first synchronization signal and a projection start signal generated by extracting a first reference clock; And a plurality of image processing apparatuses that perform synchronization by setting a reference clock to the first reference clock included in the first synchronization signal and project image data to a screen through a projector in accordance with the projection start signal, Wherein the image synchronization apparatus transmits a second synchronization signal generated by extracting a second reference clock of the image synchronization apparatus to the image processing apparatus, and the image processing apparatus transmits the second reference clock of the image synchronization apparatus to the second reference Synchronization can be performed by setting the clock.

Description

TECHNICAL FIELD [0001] The present invention relates to an image synchronization system for a projector,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image synchronization system for a projector and a method of operating the same, and more particularly, to an image synchronization system for a projector and a method of operation thereof for maintaining a constant synchronization through a reference clock setting.

The beam projector is currently unable to project content above the FHD resolution, and it costs a lot. Therefore, a technique using a plurality of beam projectors is used. In other words, a plurality of image images can be projected on each of the beam projectors, resulting in a single large image image as a whole.

On the other hand, in order to project a video image using a plurality of projectors, a plurality of video processing apparatuses for controlling the plurality of projectors are required. The video data projected by each projector is combined to form one large video image as a whole In order to achieve this, the projection by each image processing apparatus must be synchronized.

However, for example, even if each image processing apparatus synchronizes the start time of image data and starts reproduction and projection at the same time, the clock time of each image processing apparatus, the process priority of the operating system, and the loading time from the storage apparatus The image data reproduction positions of the respective image processing apparatuses are different in units of milliseconds (ms), largely in units of seconds (s), depending on the resources and characteristics of the image processing apparatus. As described above, due to the synchronization error in which the reproduction positions of the respective image data are different from each other, the mismatch between the respective image data and the resulting deterioration of the image effect are caused.

Therefore, there is a need for a technique capable of correcting synchronization errors and providing improved visual effects.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image synchronization system for a projector and a method of operating the same for maintaining a constant synchronization through a reference clock setting.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to an embodiment of the present invention, an operation method of an image synchronization system for a projector including a plurality of image processing apparatuses and an image synchronization apparatus to which at least one projector is connected is disclosed. The method comprising: the image synchronization device extracting a first reference clock of the image synchronization device; Transmitting the first synchronization signal and the projection start signal including the first reference clock to the plurality of image processing apparatuses; Performing synchronization by setting the reference clock of the image processing apparatus to the first reference clock; Projecting the image data on the screen through the projector according to the projection start signal; Extracting a second reference clock of the image synchronizing apparatus from the image synchronizing apparatus; The image synchronization device transmitting a second synchronization signal including the second reference clock to the image processing device; And performing the synchronization by setting the reference clock of the image processing apparatus to the second reference clock.

According to an embodiment of the present invention, a computer readable recording medium on which a program for performing a method of operating an image synchronizing apparatus for a projector is recorded is disclosed.

According to an embodiment of the present invention, an image synchronization system for a projector is disclosed. The system comprising: an image synchronization device for transmitting a first synchronization signal and a projection start signal generated by extracting a first reference clock; And a plurality of image processing apparatuses that perform synchronization by setting a reference clock to the first reference clock included in the first synchronization signal and project image data to a screen through a projector in accordance with the projection start signal, Wherein the image synchronization apparatus transmits a second synchronization signal generated by extracting a second reference clock of the image synchronization apparatus to the image processing apparatus, and the image processing apparatus transmits the second reference clock of the image synchronization apparatus to the second reference Synchronization can be performed by setting the clock.

According to the present invention, a plurality of image processing apparatuses perform clock synchronization according to a reference clock of an image synchronizing apparatus, so that continuous synchronization can be maintained during projection through a projector. This allows for fast synchronization regardless of the codec or resolution of the video you want to play. In addition, the image synchronizing apparatus generates a signal in the form of a UDP packet, and by transmitting the signal in a multicast manner, each image processing apparatus can be suitable for a service environment in which a data transmission delay is reduced and a signal is transmitted in real time.

BRIEF DESCRIPTION OF THE DRAWINGS A brief description of each drawing is provided to more fully understand the drawings recited in the description of the invention.
1 shows a video system for a projector according to an embodiment of the present invention.
2 shows a video system for a projector according to an embodiment of the present invention.
FIG. 3 illustrates an image synchronization apparatus according to an embodiment of the present invention.
FIG. 4 illustrates an image processing apparatus according to an embodiment of the present invention.
Figure 5 shows an exemplary transparency control graph.
Figure 6 shows an exemplary gamma correction graph.
FIG. 7 illustrates a method of operation of a video system for a projector according to an embodiment of the present invention.
8 illustrates a method of operation of a video system for a projector according to an embodiment of the present invention.
9 to 11 illustrate examples of image processing of image data according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive. In addition, embodiments of the present invention will be described below, but the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements.

1 shows a video system for a projector according to an embodiment of the present invention.

The system 100 may include an image synchronization apparatus 200, an image processing apparatus 300, a projector 400, and a relay apparatus 500.

The image synchronizing apparatus 200 can control the projection of the image data by the image processing apparatus 300 and synchronize the projections. More specifically, the plurality of image processing apparatuses 300 may be directly or indirectly connected to the image synchronizing apparatus 200, and accordingly, a projection control signal may be transmitted to the plurality of image processing apparatuses 300, And the synchronization signal can be transmitted periodically or non-periodically, so that the projection by the image processing apparatus 300 can be synchronized. The signal transmitted from the image synchronizing apparatus 200 to the image processing apparatus 300 may be a user datagram protocol (UDP) packet. Here, UDP is a non-connection oriented communication protocol that does not interconnect each other. It is a communication protocol for unilaterally transmitting data from a sending side without going through a signal process that a signal is received to send information to each other on the network. Can not and can not verify that the recipient has not received or not received the data. Therefore, according to UDP, there is no data transmission delay as compared with other network protocols, and thus it is suitable for a service environment in which signals are transmitted in real time as in the present invention.

The image processing apparatus 300 may include a plurality of image processing apparatuses 300, and at least one projector 400 may be connected to each image processing apparatus 300. Accordingly, the image processing apparatus 300 can start and stop the projection by controlling the respective projectors 400 after acquiring the image data. The projection start and stop may be based on the projection control signal received from the image synchronizing apparatus 200. More specifically, the image processing apparatus 300 reproduces the image data and transmits the reproduced image data to the projector 400 So that the projector 400 can project the image data. In particular, the image processing apparatus 300 may synchronize a projection between a plurality of projectors 400 by adjusting a reference clock according to a synchronization signal received from the image synchronization apparatus 200.

The projector 400 can receive image data from the image processing apparatus 300 and project it toward the screen. Here, the image data is obtained by dividing arbitrary original image data into a plurality of image data, and image data corresponding to each of the projectors 400 can be allocated according to the positional relationship of the projector 400. That is, the projector 400 can reproduce one image data, that is, original image data, on the screen as a whole by receiving and projecting the corresponding image data.

The relay apparatus 500 is provided for connection between the image synchronizing apparatus 200 and the image processing apparatus 300, and may be a wired and / or wireless communication apparatus. For example, the relay apparatus 500 may be a switch, a router, a hub, or the like. In particular, the relay apparatus 500 can transmit various signals received from the image synchronizing apparatus 200 to the image processing apparatus 300 in a multicast manner. Accordingly, each image processing apparatus 300 can receive a signal from the image synchronizing apparatus 200 substantially without time or order difference. Accordingly, a synchronization error that may occur between the image processing apparatuses 300 due to a difference in signal reception order or transmission speed can be prevented. Even if the number of the image processing apparatuses 300 connected to the relay apparatus 500 increases, the network load is small, which is economical and the system 100 can be easily expanded.

2 shows a video system for a projector according to an embodiment of the present invention.

Referring to FIG. 2, the system 100 'may further include a storage device 600.

In the storage device 600, image data can be stored. Here, the image data may include a plurality of image data formed by dividing the original image data and / or the original image data. Accordingly, the image processing apparatus 300 may acquire the original image data and / or the plurality of image data from the storage device 600 after connecting to the storage device 600 via the relay device 500.

The configuration of the system 100 shown in FIG. 2 is illustrative, and various configurations can be applied according to the embodiment to which the present invention is applied. For example, the storage device 600 may be directly connected to the image synchronization apparatus 200 and / or the image processing apparatus 300 to store image data.

FIG. 3 illustrates an image synchronization apparatus according to an embodiment of the present invention.

The video synchronizing apparatus 200 may include a communication unit 210, a group setting unit 230, a clock extracting unit 250, and a signal generating unit 270.

The communication unit 210 is provided for direct connection with the image processing apparatus 300 or connection via a network (for example, the relay apparatus 500), and may be a wired and / or wireless communication unit 210. Specifically, the communication unit 210 can transmit signals or data from the signal generating unit 270 or the like by wire or wireless, or can receive signals or data from the image processing apparatus 300 by wire or wirelessly.

The group setting unit 230 may manage the image processing apparatus 300 belonging to the synchronization group. Herein, the synchronization group means a group of the image processing apparatus 300 that performs synchronization by receiving a synchronization signal from the image synchronization apparatus 200. When the communication unit 210 receives a group registration request signal from the image processing apparatus 300, It is possible to register these image processing apparatuses 300 in the synchronization group.

The clock extracting unit 250 may extract the reference clock of the image synchronizing apparatus 200. Here, the reference clock means a clock which is a reference for clock synchronization. The clock extraction by the clock extraction unit 250 can be performed periodically / non-periodically.

The signal generating unit 270 may generate a synchronization signal including a reference clock extracted by the clock extracting unit 250. Also, the signal generator 270 can generate various projection control signals for instructing the start and stop of the projection. The signal generated by the signal generator 270 may be in the form of a UDP packet and may be transmitted to the image processing apparatus 300 by the communication unit 210.

The storage unit 290 may store a signal or data (for example, original image data, a plurality of image data generated by dividing the original image data, etc.) corresponding to the operation of the image synchronizing apparatus 200 have. In addition, the storage unit 290 may store programs and data necessary for the operation of the video synchronizing apparatus 200.

FIG. 4 illustrates an image processing apparatus according to an embodiment of the present invention.

The image processing apparatus 300 may include a communication unit 310, a storage unit 330, a clock setting unit 350, and a projection unit 370.

The communication unit 310 is provided for direct connection with the image synchronizing apparatus 200 and / or the projector 400 or connection through a network (for example, the relay apparatus 500), and is connected to a wired and / 310). Specifically, the communication unit 310 may receive a signal or data from the video synchronization apparatus 200 by wire or wirelessly, or may transmit the signal or data to the projector 400 by wire or wirelessly.

The storage unit 330 may store a signal or data (for example, original image data, a plurality of image data generated by dividing the original image data, etc.) input / output corresponding to the operation of the image processing apparatus 300 have. In addition, the storage unit 330 may store programs and data necessary for the operation of the image processing apparatus 300.

The clock setting unit 350 can set the reference clock of the image processing apparatus 300. [ Specifically, the reference clock of the image synchronizing apparatus 200 included in the synchronizing signal received by the image synchronizing apparatus 200 by the communication unit 310 can be set as the reference clock. The reference clock setting of the clock setting unit 350 may be performed periodically or non-periodically so that synchronization of each image processing apparatus 300 can be achieved.

The projection unit 370 reproduces a plurality of image data and transmits the image data to the projector 400 through the communication unit 310 to project the image data. Specifically, the projection unit 370 can perform projection start, stop, and the like based on various projection control signals received from the image synchronization apparatus 200 by the communication unit 310. [

3 and 4, at least one of the image synchronizing apparatus 200 and the image processing apparatus 300 may further include an image dividing unit, according to an embodiment.

The image dividing unit can divide the original image data into a plurality of image data. The division by the image dividing section can be based on the positional relationship of the plurality of projectors 400. [ For example, when two projectors 400 are positioned horizontally, the image dividing unit can vertically divide the original image data to generate two pieces of image data. At this time, the image dividing unit can divide the image data so that they have a predetermined overlapping area.

3 and 4, at least one of the image synchronizing apparatus 200 and the image processing apparatus 300 may further include an image processing unit, according to an embodiment.

The image processing unit can perform predetermined image processing on a plurality of image data. The image processing may include transparency control of light, intensity control of light, warping processing, and the like.

Specifically, the image processing section can change the transparency of light of the pixels in the overlapping area of the image data. Specifically, the change may be performed for each of the plurality of image data so that the transparency of each of the R, G, and B values of the pixel is changed. This change in transparency can be performed nonlinearly depending on the position of the pixel in the overlap region. That is, the transparency can be changed so that the transparency of each pixel in the overlapping region increases nonlinearly from the non-overlap region toward the overlap region direction (i.e., the control direction).

For example, in the image processing unit, the rate of change of transparency per pixel increases as the direction of the first overlapping region increases in the first overlapping region, and the transparency of the overlapping region decreases as the direction of the second overlapping region decreases. Here, the overlap region means a overlap region in contact with the non-overlap region, the overlap region in contact with the non-overlap region, and the second overlap region means the overlap region in continuity with the first region.

In this regard, Figure 5 illustrates an exemplary transparency control graph. The graph shows the transparency according to the position of each pixel. The x-axis normalizes the pixel coordinates of the overlap region in the direction, and the y-axis represents the transparency at each pixel. The function used in the graph is as follows.

Figure 112015029323672-pat00001

Figure 112015029323672-pat00002

Here, c represents the degree of nonlinearity of the transparency change. For example, it may have a value larger than 1, preferably greater than or equal to 2. Further, the closer the transparency is to 0, the more opaque. The closer to 1 the transparency can be.

As shown, the degree of transparency of each pixel in the overlap region may gradually increase toward the control direction. Specifically, in the first overlap region (i.e., in the range of 0.0 < = x < = 0.5), the rate of increase can be gradually increased starting from a state in which the rate of increase of transparency is low. That is, since the non-overlap region has a transparency of 0, it is possible to prevent the non-continuous or rapid change of the transparency with respect to the non-overlap region in the overlap region and to change the transparency gently. In addition, the transparency converges to 1 in the second overlap region (i.e., the range of 0.5 <= x <= 1.0), but the increase rate may gradually decrease starting from a state where the increase rate of transparency is high. That is, as in the first overlap region, transparency can be increased while avoiding discontinuous or abrupt changes in transparency.

As described above, by modifying the transparency gently, it is possible to eliminate the phenomenon that the edge occurs at the boundary of the overlapping region due to the Mach band effect. In addition, by making the transparency in the first overlapping area and the second overlapping area symmetrical as shown in the drawing, it is possible to prevent an image image which is too bright even when other image data having the same overlapping area are projected together.

The image processing unit can change the intensity of light of the pixels in the overlapping area of the image data. Even if the transparency is adjusted by the image processing unit, since the human eye recognizes the light non-linearly, distortion of light, i.e., gray banding may occur in the overlapping region. Accordingly, the image processor increases the intensity of each of R, G, and B of each pixel to increase the brightness of the image in the overlap region, thereby eliminating the gray banding phenomenon, thereby providing a smooth image without distortion.

For example, this intensity change can be made by gamma correction. Gamma correction is a non-linear transformation of a light intensity signal using a nonlinear transfer function. In this regard, FIG. 6 illustrates an exemplary gamma correction graph. The graph shows the intensity of light corrected according to the intensity of light before correction in each pixel. The x-axis normalizes the intensity of the light before correction and the y-axis normalizes the intensity of the light after correction. The function used in the gamma correction is as follows.

Figure 112015029323672-pat00003

Here, c represents a gamma value which is a degree of nonlinearity of the intensity change, and may have a value larger than 1, for example, and preferably within a range of 1.8 to 2.2. According to the gamma correction, the brightness of the image in the overlapping region is increased, but the relatively dark region has a larger increase value than the bright region, so that the gray banding can be removed to provide a clearer and smoother image.

The image processing unit may warp a plurality of image data to correspond to the geometric shape of the screen on which the image data is projected. Generally, when projecting light by the projector 400, it is considered that distortion occurs due to spreading as the distance from the surface touched by the straightness of light increases, and as the surface touched is closer. Accordingly, the image processing unit recognizes the geometric shape of the screen (i.e., the depth value of the screen) by, for example, a depth camera, and then, depending on the distance of the region to be projected, By transforming the coordinates to offset the straightness of the light, distortion of the image due to the geometrical shape of the screen can be prevented from occurring.

FIG. 7 illustrates a method of operation of a video system for a projector according to an embodiment of the present invention.

In step S710, the image synchronizing apparatus 200 may extract the first reference clock. Here, the first reference clock means a clock serving as a reference for clock synchronization.

Then, the image synchronizing apparatus 200 can transmit the first synchronization signal and the projection start signal to the plurality of image processing apparatuses 300 (step S720). Here, the first synchronization signal is for synchronization between the plurality of image processing apparatuses 300 and may include a first reference clock, and the projection start signal causes the image processing apparatus 300 to perform projection through the projector 400 May be a signal to initiate.

Subsequently, the image processing apparatus 300 can perform synchronization by setting the reference clock of the image processing apparatus 300 as the first reference clock (step S730). The plurality of image processing apparatuses 300 are set to the same reference clock as that of the image synchronizing apparatus 200 and then the reference clocks are similarly increased in accordance with the clock periods of the respective image processing apparatuses 300, Device 300 may be clock-synchronized.

Subsequently, the image data can be projected onto the screen through the projector 400 (step S740). May be performed by each image processing apparatus 300 by reproducing the image data and transmitting it to the projector 400. Since all the image processing apparatuses 300 start the projection of the image data from the same reference clock, the plurality of image processing apparatuses 300 have the same stream time. Here, the stream time is a time relative to the start time of the reproduction of the video data. For example, the stream time during reproduction may be a value obtained by subtracting the start time from the reference clock. The video data of the time line of the corresponding video data can be reproduced according to the stream time. Therefore, the image data projected on the screen through the projector 400 can also be synchronized.

Next, the image synchronizing apparatus 200 can extract the second reference clock of the image synchronizing apparatus 200 (step S750). The step S750 may be performed after a predetermined period elapses from the step S740.

Next, the image synchronizing apparatus 200 may transmit a second synchronizing signal including the second reference clock to the image processing apparatus 300 (step S760). Here, the second synchronization signal is for synchronization correction between the plurality of image processing apparatuses 300, and may include a second reference clock.

Subsequently, the image processing apparatus 300 can perform synchronization by setting the reference clock of each image processing apparatus 300 as the second reference clock (step S770). In step S770, when the reference clock is reset, the stream time is re-calculated on the basis of the reference time, so that the image data can be projected on the timeline corresponding to the re-calculated stream time. Even if the image processing apparatus 300 is clock-synchronized by the step S730, a synchronization error may occur between the image processing apparatuses 300 over time, 2 reference clock so that all the image processing apparatuses 300 are clock-synchronized again.

According to the embodiment, steps S750 to S770 may be performed periodically. Thus, the reference clock of each image processing apparatus 300 can be periodically corrected to achieve continuous clock-synchronization.

8 illustrates a method of operation of a video system for a projector according to an embodiment of the present invention.

The method 800 of FIG. 8 may be performed before or during the method 700 of FIG. First, in step S810, the image processing apparatus 300 may transmit a synchronization group registration request signal to the image synchronization apparatus 200. [ Here, the synchronization group refers to a group of the image processing apparatus 300 that receives the projection control signal and the synchronization signal by the image synchronization apparatus 200 and performs image synchronization.

In response to the transmission, the image synchronization apparatus 200 may register the image processing apparatus 300 in the synchronization group (step S820). If the image processing apparatus 300 is registered in the synchronization group in step S820, steps S830 to S890 may be performed on the image processing apparatuses 300 registered in the synchronization group.

9 to 11 illustrate examples of image processing of image data according to an embodiment of the present invention.

First, referring to FIG. 9, a plurality of image data 900 and 900 'may be provided. Each of the plurality of image data 900, 900 'may include non-overlapping regions 910, 910' and overlapping regions 920, 920 '. Here, the overlap regions 920 and 920 'may include the first overlap regions 922 and 922' and the second overlap regions 924 and 924 'as regions having the same image between the image data. May include first overlap regions 922 and 922 'in contact with non-overlap regions 910 and 910' and second overlap regions 924 and 924 'in succession to first overlap regions 922 and 922' have.

The image processing unit changes the transparency of the light of each pixel in accordance with the position of each pixel in the overlapping regions 920 and 920 'with respect to each of the plurality of image data 900 and 900'. This can be done by changing the transparency of each pixel in the overlap regions 920 and 920 'to nonlinearly increasing in the direction of the overlap regions 920 and 920' in the non-overlap regions 910 and 910 ' have. Preferably, in the first overlapping regions 922 and 922 ', transparency increases so that the rate of change of transparency per pixel increases as the position of the pixel increases toward the direction, and in the second overlapping regions 924 and 924' The degree of transparency may be increased so that the rate of change decreases in the direction.

As described above, the transparency increases nonlinearly in the overlap regions 920 and 920 ', so that the image data 1000 and 1000' as shown in FIG. 10A can be generated. As shown, the transparency increases from the first overlap region to the second overlap region direction, so that a dark image image as a whole can be provided.

However, when the image data 1000 and 1000 'are directly projected through the projector 200, gray banding may occur in the projected image as shown in FIG. 10 (b). Therefore, the image processing unit can change the light intensity of each pixel for each of the plurality of image data 1000, 1000 '. This can be done, for example, by gamma correction, which increases the brightness of the image within the overlap area. By gamma correction, a gamma value of greater than 1, preferably in the range of 1.8 to 2.2, may be used. Thus, as shown in FIG. 11, it is possible to acquire a video image from which gray banding is removed.

Claims (17)

A method of operating an image synchronization system for a projector, comprising a plurality of image processing apparatuses and an image synchronization apparatus to which at least one projector is connected,
Extracting a first reference clock of the image synchronization apparatus from the image synchronization apparatus;
Transmitting the first synchronization signal and the projection start signal including the first reference clock to the plurality of image processing apparatuses;
Performing synchronization by setting the reference clock of the image processing apparatus to the first reference clock;
Projecting the image data on the screen through the projector according to the projection start signal;
Extracting a second reference clock of the image synchronizing apparatus from the image synchronizing apparatus;
The image synchronization device transmitting a second synchronization signal including the second reference clock to the image processing device; And
Wherein the image processing apparatus performs synchronization by setting the reference clock of the image processing apparatus to the second reference clock,
Wherein the step of extracting the second reference clock or performing the synchronization is performed periodically. delete The method according to claim 1,
Wherein the transmission by the video synchronization device is performed in a multicast manner. The method according to claim 1,
The image processing apparatus transmitting a synchronization group registration request signal to the image synchronization apparatus; And
Wherein the image synchronization apparatus registers the image processing apparatus in a synchronization group,
Wherein the transmission by the video synchronization apparatus is performed for the video processing apparatuses registered in the synchronization group. The method according to claim 1,
Further comprising the step of the image processing apparatus acquiring the plurality of image data,
Wherein the plurality of image data is generated by dividing the original image data, and each of the plurality of image data includes an overlap region and a non-overlap region with other image data. 6. The method of claim 5,
Wherein the plurality of image data acquired by the image processing apparatus is divided based on a positional relationship between the projectors connected to the image processing apparatus. 6. The method of claim 5,
Wherein image processing including at least one of a transparency change and an intensity change of light is performed on each of the plurality of image data,
Wherein the transparency modification includes a nonlinear increase of the transparency in the direction of the overlap region in the non-overlap region for each pixel in the overlap region,
Wherein the intensity variation comprises a non-linear increase in intensity that increases the brightness of the image in the overlap region. 8. The method of claim 7,
Wherein a warping process is performed on each of the plurality of image data to correspond to the geometric shape of the screen. 9. A computer-readable recording medium on which a program for performing the method according to any one of claims 1 to 8 is recorded. 1. An image synchronization system for a projector,
An image synchronization device for transmitting a first synchronization signal and a projection start signal generated by extracting a first reference clock; And
And a plurality of image processing apparatuses that perform synchronization by setting a reference clock to the first reference clock included in the first synchronization signal and project image data to a screen through a projector in accordance with the projection start signal,
Wherein the image synchronization apparatus transmits a second synchronization signal generated by extracting a second reference clock of the image synchronization apparatus to the image processing apparatus, and the image processing apparatus transmits the second reference clock of the image synchronization apparatus to the second reference Synchronization is performed by setting it as a clock,
Wherein the extraction of the second reference clock by the image synchronization device, the transmission of the second synchronization signal, and the synchronization by the image processing device are performed periodically. delete 11. The method of claim 10,
Wherein the transmission by the video synchronization device is performed in a multicast manner. 11. The method of claim 10,
Wherein the image processing apparatus registers the image processing apparatus in a synchronization group when the image processing apparatus transmits a synchronization group registration request signal to the image synchronization apparatus,
Wherein the transmission by the video synchronization apparatus is performed for the video processing apparatuses registered in the synchronization group. 11. The method of claim 10,
Wherein the image processing apparatus acquires the plurality of image data, wherein the plurality of image data is generated by dividing the original image data, and each of the plurality of image data includes an overlap region and a non-overlap region with other image data System. 15. The method of claim 14,
Wherein the plurality of image data acquired by the image processing apparatus is divided based on a positional relationship between the projectors connected to the image processing apparatus. 15. The method of claim 14,
Wherein image processing including at least one of a transparency change and an intensity change of light is performed on each of the plurality of image data,
Wherein the transparency modification includes a nonlinear increase of the transparency in the direction of the overlap region in the non-overlap region for each pixel in the overlap region,
Wherein the intensity variation comprises a non-linear increase in intensity that increases the brightness of the image in the overlap region. 17. The method of claim 16,
Wherein warping processing is performed on each of the plurality of image data to correspond to the geometric shape of the screen.
KR1020150041694A 2015-03-25 2015-03-25 Image synchronizing system for projectors and operation method thereof KR101681751B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150041694A KR101681751B1 (en) 2015-03-25 2015-03-25 Image synchronizing system for projectors and operation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150041694A KR101681751B1 (en) 2015-03-25 2015-03-25 Image synchronizing system for projectors and operation method thereof

Publications (2)

Publication Number Publication Date
KR20160116108A KR20160116108A (en) 2016-10-07
KR101681751B1 true KR101681751B1 (en) 2016-12-05

Family

ID=57145345

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150041694A KR101681751B1 (en) 2015-03-25 2015-03-25 Image synchronizing system for projectors and operation method thereof

Country Status (1)

Country Link
KR (1) KR101681751B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101695931B1 (en) * 2016-10-25 2017-01-12 오재영 Image apparatus for multi-screens

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007295026A (en) * 2006-04-20 2007-11-08 Victor Co Of Japan Ltd Luminance correction apparatus in multi-projection system
JP4977950B2 (en) * 2004-02-04 2012-07-18 セイコーエプソン株式会社 Multi-screen video playback system, video playback method and display device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100652156B1 (en) * 2003-03-26 2006-11-30 마츠시다 덴코 가부시키가이샤 Method for creating brightness filter and virtual space creating system
KR101063153B1 (en) * 2009-06-03 2011-09-07 주식회사 시공테크 Synchronous Control System and Synchronous Control Method for Stereoscopic Screening

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4977950B2 (en) * 2004-02-04 2012-07-18 セイコーエプソン株式会社 Multi-screen video playback system, video playback method and display device
JP2007295026A (en) * 2006-04-20 2007-11-08 Victor Co Of Japan Ltd Luminance correction apparatus in multi-projection system

Also Published As

Publication number Publication date
KR20160116108A (en) 2016-10-07

Similar Documents

Publication Publication Date Title
US10856029B2 (en) Providing low and high quality streams
JP6674150B2 (en) Apparatus and method for processing video content for display control
KR102284721B1 (en) Method and apparatus for displaying application data in wireless communication system
US10623715B2 (en) Information processing apparatus and control method therefor
CN107592452B (en) Panoramic audio and video acquisition device and method
KR20170088357A (en) Synchronized media servers and projectors
JP6181931B2 (en) Projection apparatus, control method, program, and projection system
US11778267B2 (en) Multi-mode conversion of multiple video streams
US20150029396A1 (en) Networked programmable timecode and metadata transfer system
US20140365685A1 (en) Method, System, Capturing Device and Synchronization Server for Enabling Synchronization of Rendering of Multiple Content Parts, Using a Reference Rendering Timeline
KR101681751B1 (en) Image synchronizing system for projectors and operation method thereof
CN113938617A (en) Multi-channel video display method and equipment, network camera and storage medium
US20180130232A1 (en) Image processing apparatus, image processing method, and storage medium
US11849171B2 (en) Deepfake content watch parties
US20230179822A1 (en) Karaoke Content Watch Parties
US20230179825A1 (en) Cell Phone Content Watch Parties
KR102404130B1 (en) Device for transmitting tele-presence image, device for receiving tele-presence image and system for providing tele-presence image
US20140267870A1 (en) Mixed media from multimodal sensors
US20200234500A1 (en) Method, device and computer program
KR20230006865A (en) Multiple output control based on user input
KR102524987B1 (en) Method and Apparatus for Providing and Storing Streaming Contents
US11621023B2 (en) Media recording system
US20160212391A1 (en) Method and device for projecting content
US20210385429A1 (en) Transmission processing apparatus, transmission processing method, and storage medium
KR101794521B1 (en) Tree-dimention video display system

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20191121

Year of fee payment: 4