JP2017003925A - Video display system, projection type video display device and projection type video display device control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which when transmitting video signals from a portable terminal 201 to a plurality of projectors 101A to C via a radio wave, buffering processing at radio wave units 115 of respective projectors are different to thereby cause a delay, and further variation occurs in video outputs from respective projectors, thus, the video becomes defective.SOLUTION: A video signal 302 to be transmitted from a portable terminal 201 has video time information 301 to output a video signal added. A maximum video signal delay time T shared by each projector 101 is added to the video time, and on the basis of time information shared by each projector, the video signal is delayed to be output, which in turn a synchronous video is output to be displayed from a plurality of projectors.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a video display system including a plurality of projection video display devices and a control method for the projection video display device.

  Patent Document 1 has an object to provide a projector capable of facilitating unified control of the operation mode of each projector and improving usability when performing image display using a plurality of projectors. It is characterized in that information is embedded in the screen, and information is transmitted by other projectors recognizing the information with a camera.

JP 2011-70086 A

  When a video signal is sent from a portable terminal to a plurality of projectors via radio, when the video signal is received by each projector's wireless receiver and output, the buffering process at each projector's wireless receiver is different. A delay occurs in the video signal output from each wireless receiver. This delay varies with each connection, and also varies with each reconnection when the wireless connection is disconnected for some reason. Due to this delay, there is a variation in the video output time from each projector, and there is a problem that the video breaks down in the case of a large screen, high brightness / high definition, and 3D. The same applies to connection via a network instead of wireless communication.

  In Patent Document 1, it is not described how to control in order to suppress variations in the output time of the video output from each projector.

  An object of the present invention is to send video signals from a portable terminal to a plurality of projectors wirelessly, and to perform video output without variation among a plurality of projectors when a large screen, high brightness / high definition, and 3D are implemented. It is to do.

  In order to achieve the above object, for example, the configuration described in the claims is adopted.

  According to the present invention, when a video signal is wirelessly transmitted from a portable terminal to a plurality of projectors, and received by a wireless reception unit of each projector and output as a video signal, the video signal is output from each wireless reception unit. By sharing the delay with the shared reference time and the maximum video signal delay time obtained from the time information added to the video signal among the plurality of projectors, it is possible to synchronize the video output of the plurality of projectors. is there.

1 is a diagram illustrating a configuration of a video display system according to Embodiment 1. FIG. It is a figure which shows the structure of the portable terminal 201 which produces | generates the transmission signal 202. FIG. FIG. 3 is a diagram illustrating a configuration of a video transmission signal included in a transmission signal 202. It is a figure explaining the output delay adjustment operation | movement of the video signal of each projector. It is a figure explaining the projection usage example (display mode) of a some projector. 5 is a flowchart illustrating control of video delay processing by a control unit 113. It is a figure which shows the structure of the video display system concerning Example 2. FIG. 10 is a flowchart illustrating video delay processing control according to the second exemplary embodiment. It is a figure which shows the detail of step S801 (arrangement recognition) of FIG. It is a figure which shows the detail of step S802 (display mode determination) of FIG. FIG. 10 is a diagram illustrating a configuration of a video display system according to a third embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. The present invention is not limited to the examples.

  FIG. 1 is a diagram illustrating the configuration of the video display system according to the first embodiment. Video signals are transmitted from one portable terminal (video transmission device) to three projectors (projection-type video display devices) 101A, 101B, and 101C wirelessly, and video projections 114A, 114B, and 114C are transmitted from the respective projectors. An example is shown. The structures of the projectors 101A, 101B, and 101C are exactly the same, and each component block is represented with the subscripts A, B, and C.

  First, a projection usage example (display mode) of a plurality of projectors will be described with reference to FIG. FIG. 5A shows a usage example (large screen mode) in which projections of a plurality of projectors are connected to form a large screen. In FIG. 5A, three projectors PJ1, PJ2, and PJ3 are connected horizontally, but it is also possible to connect them vertically or connect both horizontally and vertically using more projectors. . FIG. 5B shows a case where projections from a plurality of projectors are collected into one to achieve high brightness or high definition (high brightness / high definition mode). In this case, all the projected images have the same content. FIG. 5C shows the projections for the left eye and the right eye collected for 3D video in one (3D mode). FIG. 5D shows an example in which a plurality of projectors are used independently (independent mode), and the same image may be projected or different images may be projected.

  In the display modes (synchronous mode) shown in FIGS. 5A, 5B, and 5C, the video to be displayed is broken if the video output of each projector is not synchronized in time. Here, an operation will be described when the image projections 114A, 114B, and 114C from the three projectors 101A, 101B, and 101C in FIG. 1 are made to correspond to the large screen mode as shown in FIG.

  A transmission signal 202 is wirelessly transmitted from the portable terminal 201 to the projectors 101A, 101B, and 101C. For example, a wireless LAN is used as the transmission path.

  FIG. 2 is a diagram illustrating a configuration of the mobile terminal 201 that generates the transmission signal 202. A video signal is stored in the signal source 211. This video signal may be an image-compressed signal. The terminal control unit 213 obtains video time information, which is the time for outputting each video signal from the portable terminal 201, from the terminal clock 214 to the video signal from the signal source 211, and the multiprocessing unit 212 time-compresses the video signal. Then, the video time information is multiplexed into the time of the gap compressed by the time to obtain a video transmission signal. The video transmission signal is wirelessly transmitted by the terminal wireless unit 215, and the transmission signal 202 is transmitted from the antenna 216.

  FIG. 3 is a diagram illustrating a configuration of a video transmission signal included in the transmission signal 202. The video transmission signal 300 in FIG. 3A shows the case of a moving image, and 302 [1], 302 [2], 302 [3], and 302 [4] are video signals, and 301 [1], 301 [2] ], 301 [3] and 301 [4] are moving picture time information of video signals having the same numbers in []. The video time information is the time at which each video signal is output from the portable terminal 201. By outputting each video signal according to the time indicated in the video time information, the video can be reproduced at a normal timing. . The interval of the moving picture time information is one frame of one screen unit at the maximum, but it may be one line unit in one screen and one pixel unit in one screen, and the projection deviation from each projector is visually recognized. The time unit is not used. The video signal 302 may be an image-compressed signal. At this time, the video signal has time information for video playback separately. FIG. 3B shows an example in which the video signal 304 is a still image. In the case of a still image, the time when the still image is switched is multiplexed as still image switching time information 303. Of course, even a still image may be handled as a moving image as shown in FIG.

  Transmission signal 202 is received by antenna 102A of projector 101A, antenna 102B of projector 101B, and antenna 102C of projector 101C. In the following description, the same operations in the operations of the three projectors will be described using the subscripts A, B, and C, and the subscripts A, B, and C will be described only when the operations are different.

  A transmission signal 202 received by the antenna 102 is output to the radio unit 115. The wireless unit 115 includes a front end (hereinafter abbreviated as F / E) 103, a signal processing unit 104, and a memory 105. The transmission signal 202 is demodulated by the F / E 103 to become a digital signal, reproduced by the signal processing 104 and the memory 105, and the video transmission signal 305 shown in FIG.

  Here, in each of the projectors 101A, 101B, and 101C, the video transmission signal 305 is similarly output from the signal processing units 104A, 104B, and 104C, but different delays occur due to differences in buffering processing and jitter, The time for outputting the video transmission signal is different. This will be described with reference to FIG. 305A is a video transmission signal output from the signal processing unit 104A, 305B is a video transmission signal output from the signal processing unit 104B, and 305C is a video transmission signal output from the signal processing unit 104C.

  The time information extraction unit 109 extracts the moving image time information 301 from the video transmission signal 305 output from the signal processing unit 104 and sends it to the control unit 113. The control unit 113 obtains the current time information from the clock 112 and compares it with the moving image time information 301 to obtain the video signal delay time. This video signal delay time differs among projectors 101A, 101B, and 101C. Here, Ta, Tb, and Tc are respectively shown in FIG. 3C. Note that the times of the clocks 112A, 112B, and 112C in each projector are controlled by the control units 113A, 113B, and 113C using the transmission / reception units 111A, 111B, and 111C, and are calibrated at the same time by the communications 131 and 132.

  Control unit 113B of the master projector (for example, projector 101B) determines the longest video signal delay time (maximum video signal delay time T) among video signal delay times Ta, Tb, and Tc. In the example of FIG. 3C, T = Tc. The control unit 113B transmits the value of the maximum video signal delay time T to the other projectors 101A and 101C via the transmission / reception units 111A, 111B, and 111C through the communication 131 and 132 and is shared by each projector. The transmission / reception units 111A, 111B, and 111C can be easily installed if wireless is used. For example, Bluetooth (registered trademark) can be used.

  On the other hand, the video signal processing unit 106 extracts the video signal 302 from the video transmission signal 305 output from the signal processing unit 104, and performs time expansion processing of the video signal. At this time, if the video signal itself is image-compressed, the image expansion processing is also performed. Further, a part of the large screen composed of the projections 114A, 114B, and 114C handled by the projectors 101A, 101B, and 101C is extracted from the video signal, and the images are captured by the optical systems 108A, 108B, and 108C. The projections 114A, 114B, and 114C are output to reproduce a single large-screen video signal.

  At this time, the video signal processing unit 106 adds the maximum video signal delay time T to the moving image time information 301 and outputs the video signal 302 to the optical system 108 based on the time information of the clock 112. As a result, as shown in FIG. 3 (d), it is possible to realize projections 114A, 114B, and 114C of images with no time shift by the respective projectors 101A, 101B, and 101C. Specifically, in the video signal processing units 106A, 106B, and 106C, the video signal 302 is delayed by the delay adjustment memories 107A, 107B, and 107C by T-Ta, T-Tb, and T-Tc, respectively. The video signal 302 is output with reference to.

  Here, the longest video signal delay time among the video signal delay times Ta, Tb, and Tc is set as the maximum video signal delay time T. If another processing time (adjustment time) is necessary, add this. Thus, the maximum video signal delay time T may be determined.

  Also, the video output delay adjustment based on the moving image time information 301 may be performed every time the moving image time information 301 is received, but is performed at a predetermined time interval or when a time variation is detected in the projected image. Also good.

FIG. 4 is a diagram for explaining the output delay adjustment operation of the video signal of each projector.
[S400] Operation starts. [S401] The master is, for example, PJ2, the number of PJ2 (hereinafter referred to as No.) is set to 0, and [S402] the number of projectors is set to 3. [S403] PJ2 (master) searches for the remaining projectors (slave) other than its own device, and No. Is set (No. 1, No. 2), and the time of [S404] PJ2 is transferred as reference time information R. [S405] After confirming the transfer of the reference time information, [S406] Each projector calculates the video signal delay time, and [S407] PJ2 requests each video signal delay time.

  [S408] After receiving the video signal delay time from each projector, PJ2 sets the maximum video signal delay time T based on the maximum delay time [S409]. [S410] The maximum video signal delay time T is transferred to each projector to share information. [S411] Each projector sets a delay adjustment amount. By adding the maximum video signal delay time T to the moving image time information 301 [S412], it becomes possible to output the video signal in synchronization with each projector. The master may be PJ1 or PJ3. The search processing in [S403] may be performed by either the wireless unit 115 or the transmission / reception unit 111.

  The operation when the projections 114A, 114B, and 114C of the three projectors 101A, 101B, and 101C of FIG. 1 are made to correspond to the large screen mode of FIG. 5A has been described above, but FIG. The high brightness / high definition mode and the 3D mode of FIG. 5C are the same as those of FIG. The difference is that, in the case of the large screen mode of FIG. 5A, the video signal processing unit 106 is composed of the projections 114A, 114B, and 114C of the projectors 101A, 101B, and 101C of the video signal. A location that is part of the screen has been extracted, but this is not the case. On the other hand, in the independent mode shown in FIG. 5D, it is generally not necessary to perform a delay process on the video signal.

  FIG. 6 is a flowchart showing video delay processing control by the control unit 113. In the setting information sections 110A, 110B, and 110C, which display mode to perform in FIGS. 5A, 5B, 5C, and 5D is input and stored. For example, in step S601, a mode is input from the input terminal 116B of the master PJ2 to the setting information unit 110B, the transmission / reception units 111A, 111B, and 111C are used, and the control units 113A, 113B, and 113C are controlled. The mode is transferred to the setting information units 110A and 110C and shared. In step S602, the display mode is confirmed, and if it is the synchronous mode shown in FIGS. 5A, 5B, and 5C, it is determined that the delay adjustment processing is necessary. In step S603, the video signal delay adjustment processing described in FIG. Do. On the other hand, in the independent mode of FIG. 5D, it is determined that the delay process is unnecessary, and the video is output without the delay process.

  According to the control of FIG. 6, in the display modes of FIGS. 5A, 5B and 5C where the video signals output from the respective projectors should not be shifted in time, a delay process is performed, and the video signal shifts. In the case of the allowable display mode of FIG. 5D, since the delay process is not performed, there is an effect that an unnecessary delay is not generated in the case of FIG. In addition, since wireless is used for the transmission / reception unit 111, there is an effect that it can be easily arranged when a plurality of projectors are arranged.

  According to the first embodiment, when a video signal is wirelessly transmitted from a mobile terminal to a plurality of projectors and received by a wireless reception unit of each projector and output as a video signal, the video signal is output from each wireless reception unit. The effect of being able to synchronize the video output of multiple projectors by sharing the delay that occurs with the shared reference time and the maximum video signal delay time obtained from the time information added to the video signal among multiple projectors There is.

  In the second embodiment, the video display mode of each projector is automatically recognized, and the delay of the video signal is adjusted according to the display mode.

  FIG. 7 is a diagram illustrating the configuration of the video display system according to the second embodiment. The same reference numerals as those in FIG. 1 represent the same functions. The projector 101B as a master uses the camera (photographing unit) 701 and the video analysis unit 702 to recognize the arrangement of each projector and automatically recognize the video display mode in FIG. In FIG. 7, the camera 701 is outside the projector 101B, but may be built-in, and the video analysis unit 702 may be outside the projector 101B.

  FIG. 8 is a flowchart illustrating control of video delay processing in the second embodiment. The processing in FIG. 8 is mainly controlled by the control unit 113. The same reference numerals as those in FIG. 6 denote the same functions.

  In step S801, how the projectors are arranged is automatically recognized. Therefore, a test pattern image is projected from each projector, and this is photographed by the camera 701 to recognize the arrangement of each projector. Details will be described with reference to FIG.

  In step S802, the video analysis unit 702 obtains the degree of overlap of the test pattern video of each projector, and determines which video display mode is used in FIGS. 5A, 5B, 5C, and 5D. To do. Details will be described with reference to FIG.

  In step S803, image projection adjustment and settings such as alignment according to FIGS. 5A, 5B, 5C, and 5D are performed. For example, in FIG. 5A, brightness / color / geometric alignment and edge blending are performed.

  Steps S804 and S805 are the same as steps S602 and S603 in FIG. 6, and the display mode is confirmed. If the synchronization mode is in FIGS. 5A, 5B, and 5C, video signal delay adjustment processing is performed. In the independent mode of FIG. 5D, no delay process is performed.

  Thereafter, in step S806, the camera 701 and the video analysis unit 702 are always monitored for changes in the projector arrangement, the display mode in FIG. 5 and the adjustment in step S803. If there is a change, resetting is performed. Do.

FIG. 9 is a diagram showing details of step S801 (placement recognition) in FIG.
In step S901, the camera 701 is connected to, for example, the projector PJ2. This may be PJ1 or PJ3. The PJ2 to which the camera is connected is set as a master, and the PJ2 number (hereinafter referred to as No.) is set to 0. In step S902, the number of projectors used is set as the master PJ2. Here, it is set to three. In step S903, the remaining projectors (slaves) are searched and No. Is allocated. This search process may be performed by either the wireless unit 115 or the transmission / reception unit 111.

  No. of the projector set in step S904. In contrast, for example, test pattern images are projected and displayed in ascending order. In step S905, the display image of the test pattern is taken by the camera 701, and the display position is analyzed and held by the video analysis unit 702. Steps S904 and S905 are repeated until the arrangement (display position) of all projectors is confirmed in step S906.

  In the example of FIG. 5A, first, the position of the projection 114B of the master PJ2 projector (101B) is confirmed by the video analysis unit 702. Thereafter, for example, the PJ1 projector (101A) is No. 1, PJ3 projector (101C) is no. 2 is assigned by the video analysis unit 702. The position of the projection 114A of PJ1, which is 1, is known in comparison with the position of the projection 114B. The position of the projection 114C of PJ3, which is 2, can be seen in comparison with the positions of the projections 114B and 114A. In this way, the projection 114A, 114B, 114C is assigned to which No. It is recognized whether the image is projected from the projector. Note that the test pattern is displayed not only by one projector, but also by the master No., for example. A plurality of projectors may be lit or blinked for easy recognition, such as always displaying or blinking the zero projector. When the confirmation of the projection arrangement of all the projectors is completed, this process ends.

FIG. 10 is a diagram showing details of step S802 (display mode determination) in FIG.
Since the projection arrangement of all the projectors is known in step S801, the image analysis unit 702 analyzes the degree of overlap of the projection images between the projectors in step S1001. In step S1002, the degree of overlap is evaluated by the overlap area ratio, and compared with a predetermined ratio, for example, a ratio 1/2.

  If the overlap ratio is less than ½ of the video area, the process proceeds to step S1003, and the display mode is determined to be the large screen display mode in FIG. If there is no overlap, the process advances to step S1004 to determine the independent display mode of the plurality of projectors in FIG. If the overlap ratio is 1/2 or more of the video area, the process proceeds to step S1005.

  When the overlap ratio is ½ or more of the image area, either the high brightness / high definition mode in FIG. 5B or the 3D mode in FIG. 5C is used, but the projection positions completely overlap in both cases. Therefore, it cannot be determined only by the degree of overlap. Therefore, in step S1005, a transmission signal of a video signal to be displayed is sent from the portable terminal 201, and it is identified whether or not it is a 3D video signal (consisting of a left-eye video signal and a right-eye video signal). If it is not a 3D video signal, the process proceeds to step S1006 to determine the high luminance / high definition mode in FIG. 5B. If it is a 3D video signal, the process proceeds to step S1007 to determine the 3D mode in FIG.

  Thus, the determination of the display mode of the plurality of projectors is completed in step S1008. In step S1009, the determined display mode is transferred as setting information to each projector by communication 131, 132 via transmission / reception units 111A, 111B, 111C and stored in setting information unit 110.

  In the comparison of the degree of overlap, the area ratio less than 1/2 is set to, for example, less than 1/4 or less than the overlap area value of the edges of the large screen, and the area of 1/2 or more is set to, for example, 3/4 or more. It is good also as more than the area value which comprises the same screen. At this time, if the area ratio of the degree of overlap does not meet the determination condition, a caution display is output so as to adjust the condition.

  According to the second embodiment, the projector arrangement can be automatically recognized by simply placing the projector and projecting, and the display mode of the projector can be set according to the degree of overlap of the projected images, so that it is very easy to use. That is, it is particularly suitable when each projector is carried and the installation location is variously changed. In addition, since the camera has a monitoring mode at any time, there is an effect that even if the location of the projector is moved during projection or a non-projection object is moved during projection, it can be automatically followed.

  In the third embodiment, the camera built in the portable terminal 201 is used to automatically recognize the projector arrangement and the video display mode.

  FIG. 11 is a diagram illustrating the configuration of the video display system according to the third embodiment. 1 and 7 indicate the same function. In this example, the video display mode is automatically recognized by using the camera 1101 built in the portable terminal 201 and the video analysis unit 702 of the master PJ2 projector (101B).

  The automatic determination of the video display mode and the control of the video delay process in the third embodiment are basically the same operations as those in FIGS. The change is that in step S901 in FIG. 9, the portable terminal 201 and the wireless unit 115B are connected to the master PJ2 projector (101B), and the video 1102 captured by the camera 1101 is transmitted to the wireless unit 115B. Like that. In step S905, the test pattern image is photographed toward the test pattern projected by the camera 1101, and the image analysis unit 702 extracts the test pattern that is the image photographed by the camera 1101 from the output signal of the signal processing unit 104B. Video analysis. Note that when the camera 1101 is directed toward the projected test pattern, the projection range from the camera 1101 is easily determined by performing projection from all projectors first. The video analysis unit 702 also removes the influence of camera shake that occurs due to shooting by the built-in camera 1101 of the mobile terminal 201.

  According to the third embodiment, since a camera with a built-in mobile terminal can be used without adding a camera on the projector side, there is an effect that a low-cost video display system can be constructed.

  Although three projectors are used in the first to third embodiments, it goes without saying that two or more projectors are applicable. The master projector can be any projector. The transmission / reception unit 111 is easy to install if wireless is used. For example, Bluetooth (registered trademark) can be used. The wireless unit 115 can use, for example, a wireless LAN. The same applies to connection via a network instead of wireless communication.

  DESCRIPTION OF SYMBOLS 101 ... Projector (projection type image display apparatus), 102 ... Antenna, 103 ... F / E, 104 ... Signal processing part, 105 ... Memory, 106 ... Video signal processing part, 107 ... Memory for delay adjustment, 108 ... Optical system, DESCRIPTION OF SYMBOLS 109 ... Time information extraction part, 110 ... Setting information part, 111 ... Transmission / reception part, 112 ... Clock, 113 ... Control part, 114 ... Projection, 115 ... Radio | wireless part, 116 ... Input terminal, 131, 132 ... Communication, 201 ... Mobile Terminal (video transmission device), 202 ... transmission signal, 211 ... signal source, 212 ... multiplex processing unit, 213 ... terminal control unit, 214 ... terminal clock, 215 ... terminal radio unit, 300, 305 ... video transmission signal, 301 ... Movie time information, 302... Video signal, 701 and 1101... Camera (imaging unit), 702.

Claims (6)

A video display system that receives a video signal from a video transmission device and projects and displays a video by a plurality of projection video display devices,
The video transmission device wirelessly transmits a transmission signal including a video transmission signal in which time information to output the video signal is added to the video signal,
The plurality of projection display apparatuses are composed of a master projection display apparatus and another projection display apparatus,
A wireless unit that wirelessly receives the transmission signal from the video transmission device and demodulates the video transmission signal;
A time information extraction unit for extracting the time information from the demodulated video transmission signal from the radio unit;
A clock that gives a reference time,
A control unit for obtaining a video signal delay time by comparing the reference time of the clock and the time information extracted by the time information extraction unit;
The video signal is extracted from the demodulated video transmission signal from the wireless unit, and the video signal is delayed according to the maximum video signal delay time set by the projection-type video display device serving as the master to the projection optical system. An output video signal processing unit;
A transmission / reception unit that communicates information between the plurality of projection display apparatuses,
The control unit of the master projection display apparatus transmits and shares the reference time to the other projection display apparatus by the transmission / reception unit, and after sharing the reference time, the other projection The video signal delay time of the other projection video display device is received from the video image display device, and the maximum video signal having a maximum delay time compared with the video signal delay time of the other projection video display device A video display system, wherein a delay time is set, and the set maximum video signal delay time is transmitted to the other projection type video display device and shared. A projection video display device that receives a video signal from a video transmission device and projects and displays a video together with another projection video display device,
A radio unit that wirelessly receives a transmission signal including a video transmission signal in which time information to be output from the video signal is added to the video signal from the video transmission device; and a radio unit that demodulates the video transmission signal;
A time information extraction unit for extracting the time information from the demodulated video transmission signal from the radio unit;
A clock that gives a reference time,
The video signal delay time is obtained by comparing the reference time of the timepiece with the time information extracted by the time information extraction unit, and the maximum is compared with the video signal delay time of the other projection display device. A control unit for setting a maximum video signal delay time which is a delay time of
Video signal processing for extracting the video signal from the demodulated video transmission signal from the wireless unit, delaying the video signal according to the maximum video signal delay time set by the control unit, and outputting the delayed video signal to a projection optical system And
A transmission / reception unit for communicating information with the other projection display apparatus,
The control unit transmits and shares the reference time to the other projection display device by the transmission / reception unit, and after sharing the reference time, the control unit transmits the reference time to the other projection display device. A projection-type image display device that receives the image signal delay time of the image display device and transmits the set maximum image signal delay time to the other projection-type image display device for sharing. The projection display apparatus according to claim 2,
A setting information section for setting and storing video display modes of the projection display apparatus and the other projection display apparatus;
When the mode information of the setting information section is displayed independently from a plurality of projection type video display devices, the video signal processing section does not perform the process of delaying the video signal. Display device. The projection display apparatus according to claim 2,
Connected to a photographing unit for photographing a test image projected from each of the projection display apparatus and the other projection display apparatus;
Analyzing the position of the projection video of each projection video display device and the degree of overlap of the projection video of each projection video display device from the video shot of the imaging unit, and the video display mode of each projection video display device A video analysis unit for determining
The control unit causes the transmission / reception unit to transmit and share the video display mode determined by the video analysis unit to the other projection type video display device. The projection display apparatus according to claim 4, wherein
The imaging unit is provided in the video transmission device,
A projection-type image display apparatus, wherein a test image signal imaged by the imaging unit is input to the image analysis unit via the wireless unit. A control method for a projection display apparatus that receives a video signal from a video transmission apparatus and projects and displays an image together with another projection display apparatus,
A demodulation step of wirelessly receiving a transmission signal including a video transmission signal including time information to which the video signal should be output from the video transmission device, and demodulating the video transmission signal;
A time information extraction step of extracting the time information from the video transmission signal demodulated in the demodulation step;
A reference time communication step of transmitting and sharing a reference time given from a clock to the other projection display apparatus;
A delay time calculating step for obtaining a video signal delay time by comparing the reference time and the time information extracted in the time information extracting step;
A delay time communication step of receiving the video signal delay time of the other projection type video display device from the other projection type video display device after sharing the reference time;
A maximum delay time setting step for setting a maximum video signal delay time which is a maximum delay time compared to the video signal delay time of the other projection display apparatus;
A maximum delay time communication step of transmitting and sharing the set maximum video signal delay time to the other projection display apparatus;
A video signal processing step of extracting the video signal from the video transmission signal demodulated in the demodulation step, delaying the video signal according to the set maximum video signal delay time, and outputting the delayed video signal to a projection optical system;
A control method for a projection display apparatus, comprising:

Images