KR101681751B1 - Image synchronizing system for projectors and operation method thereof - Google Patents
Image synchronizing system for projectors and operation method thereof Download PDFInfo
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- 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
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- image
- synchronization
- image processing
- image data
- reference clock
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- 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
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- 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
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- 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
BACKGROUND OF THE
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
The
The
The
The
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
In the
The configuration of the
FIG. 3 illustrates an image synchronization apparatus according to an embodiment of the present invention.
The
The
The
The
The
The
FIG. 4 illustrates an image processing apparatus according to an embodiment of the present invention.
The
The
The
The
The
3 and 4, at least one of the
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
3 and 4, at least one of the
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.
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.
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
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
Then, the
Subsequently, the
Subsequently, the image data can be projected onto the screen through the projector 400 (step S740). May be performed by each
Next, the
Next, the
Subsequently, the
According to the embodiment, steps S750 to S770 may be performed periodically. Thus, the reference clock of each
8 illustrates a method of operation of a video system for a projector according to an embodiment of the present invention.
The
In response to the transmission, the
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
The image processing unit changes the transparency of the light of each pixel in accordance with the position of each pixel in the overlapping
As described above, the transparency increases nonlinearly in the
However, when the
Claims (17)
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.
Wherein the transmission by the video synchronization device is performed in a multicast manner.
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.
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.
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.
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.
Wherein a warping process is performed on each of the plurality of image data to correspond to the geometric shape of the screen.
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.
Wherein the transmission by the video synchronization device is performed in a multicast manner.
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.
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.
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.
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.
Wherein warping processing is performed on each of the plurality of image data to correspond to the geometric shape of the screen.
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