JP2005268838A - Video display device and video display controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display device whereby a performer can recognize presented information, even if the presented information presented for the non-photographing period of a photographing camera is colored and enhancing the visibility of the presented information. <P>SOLUTION: The video display device 10 includes a video time division means 11 for time-dividing one field interval of a video image, on the basis of a synchronizing signal with the photographing camera; a video display switching means 13 for switching the display or the non-display of the time division video image, within a photographing period or a non-photographing period to the time division video image time-divided by the video time division means 11; a video display means 15 for displaying the time division video image for display switched by the video display switching means 13; a color light display switching means 14 for switching of the display or the non-display of the color light within the photographing period or the non-photographing period; and a color light display means 16 for displaying the color light for a color light display period, switched by the color light display switching means 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a video display technique, and more particularly to a video display device and a video display control device capable of displaying a plurality of information within one field.

  2. Description of the Related Art In recent years, in a shooting site such as a television studio, an apparatus that presents information to performers by using intermittent light that is visible to a person and not captured in a video shot by a shooting camera has begun to be used (for example, Patent Document 1). . This device is an instruction that does not appear in the shooting camera due to intermittent light when the performer's dialogue, director's instructions, etc. are communicated to the performer, or when the performer is combined with the background previously photographed. Or projecting the background. As a result, the performer can actually see the characters (instructions), the background, etc., and can perform more natural performances.

  Here, a conventional information presentation technique using intermittent light will be described with reference to FIG. FIG. 10 is a schematic diagram of a television studio for explaining a conventional information presentation technique using intermittent light. It is assumed that this television studio is a studio with a wall (screen) 60 painted in a single color (for example, blue as a chroma key back) for image synthesis.

  As shown in FIG. 10, in this television studio, the image projection device 40 is an electronic shutter (CCD: Charge-Coupled Devices) incorporated in a photographing camera 30 that operates with the same synchronization signal (see FIG. 10). A video including information to be presented to the performer M is projected onto the wall 60 during a period in which (not shown) is closed.

  At this time, the video projection device 40 opens the liquid crystal shutter 50 that is installed in front of the projection lens of the video projection device 40 during the period in which the electronic shutter of the photographing camera 30 is closed. The projected image is visible to the performer M, but is not photographed by the photographing camera 30.

  Thereby, the image projected by the image projection device 40 is not reflected in the image photographed by the photographing camera 30, and image composition can be performed using the monochrome (blue) color of the wall 60 as a chroma key back. Further, the performer M can acquire information from the video projected from the video projection device 40, and can perform conversation, performance, etc. while watching the video, so that the performer M has a burden on the performance. Can be lightened.

  Here, with reference to FIG. 11 (refer to FIG. 10 as appropriate), the relationship between the signals of the electronic shutter of the photographing camera 30 and the liquid crystal shutter 50 will be described. FIG. 11 is a time chart showing the relationship between signals of the electronic shutter and the liquid crystal shutter 50. a is a vertical synchronization signal separated from the synchronization signal of the photographic camera 30 (a composite synchronization signal composed of a vertical synchronization signal and a horizontal synchronization signal); b is a signal for controlling the opening and closing of the electronic shutter of the photographic camera 30 (electronic shutter signal); c is a signal for controlling opening and closing of the liquid crystal shutter (liquid crystal shutter signal), and d is a transmission characteristic of the liquid crystal shutter. In addition, in FIG. 11, the time chart for one field which is one transmission period (16.67 milliseconds <ms>) in the interlace process which transmits one frame divided into 2 times is shown.

  As shown in FIG. 11, the photographing camera 30 opens and closes the electronic shutter by turning the electronic shutter signal b OFF and ON in one field period indicated by the vertical synchronization signal a of the photographing camera 30. Here, the electronic shutter is closed when the electronic shutter signal b is OFF, and the electronic shutter is opened when the electronic shutter signal b is ON. The liquid crystal shutter 50 projects an image when the liquid crystal shutter signal c is turned on within the closed period (OFF period) of the electronic shutter b. As a result, the liquid crystal shutter 50 projects an image within a period (OFF period) when the photographing camera 30 closes the electronic shutter, and thus the projected image is not photographed by the photographing camera 30.

  The transmission characteristic d of the liquid crystal shutter 50 generally has a slow response to the liquid crystal shutter signal c with respect to the liquid crystal shutter signal c, so that the period during which the liquid crystal shutter signal c can be turned on is shorter than the period during which the electronic shutter signal b is off. As a result, the efficiency of projecting images has deteriorated.

Therefore, recently, instead of the liquid crystal shutter 50, projection is performed using a mirror-type projection element that can be switched at high speed, which is a divided movable mirror such as DMD (Digital Micromirror Device) or GLV (Grating Light Valve). Increases efficiency. Furthermore, in a video projection apparatus using DMD or GLV, as shown in FIG. 12, for the purpose of reducing the phenomenon in which an afterimage burned into the eyes is recognized when the line of sight of a person watching the video moves greatly. The input video of one field (input video signal a) is scanned at a high speed a plurality of times (five times in FIG. 12) to generate and project a projection video signal obtained by dividing the video in one field.
JP 2002-344775 A (paragraphs 0049 to 0056, FIG. 5)

In the conventional information presentation technique using intermittent light, in order to perform image composition, a video projection device projects a video image that is not captured by the imaging camera onto a blue wall serving as a chroma key back. However, since the blue wall has poor light reflectance, the visibility is poor, and even if a color is added to the information presented to the performer, it is difficult for the performer to recognize the color. .
In addition, in the conventional information presentation technology using intermittent light, in the environment of a television studio, since the illumination for shooting is applied to the wall, the information projected on the wall by the video projection device is difficult to be seen by performers. is there.

  Furthermore, in the conventional information presentation technology using intermittent light, a performer is located between a wall where information is presented and a video projection device that presents information. There is a problem that information cannot be presented to performers without being presented. In order to avoid this problem, it is conceivable to provide a video transmission type information presentation surface (transmission type screen) between the performer and the video projection device, and project the video from the back side of the information presentation surface. In this case, by presenting information by intermittent light from the back of the information presentation surface, the information is not reflected on the photographing camera, but the information presentation surface itself is photographed by the photographing camera, so image synthesis by chroma key back is performed. I can't. Therefore, it is conceivable to project blue color light as chroma key back on the information presentation surface, but the performer can see the color light and the presentation information at the same time, thus solving the situation where the presented information is difficult to see. There is a need.

  The present invention has been made to solve the above-described problems. In the information presentation technology for presenting information to performers by intermittent light, the display information presented during the non-shooting period of the shooting camera is colored. Even if it adds, it aims at providing the video display apparatus and video display control apparatus which a performer can recognize the information, and can further improve the recognition property of presentation information.

  The present invention was created to achieve the above object, and first, the video display control device according to claim 1, when shooting is performed by a shooting camera that performs a shooting operation based on a reference synchronization signal, One field period of a video signal photographed by the photographing camera is time-divided into a photographing period and a non-photographing period, color light photographed by the photographing camera is displayed during the photographing period, and the photographing is performed during the non-photographing period. An image display control apparatus that performs control for displaying an image that is not captured by a camera, and includes an image time division unit, an image display switching unit, and a color light display switching unit.

  According to such a configuration, the video display control apparatus uses the video time division unit to capture one field section of a video signal that is shot with reference to a synchronization signal (reference synchronization signal) as a reference with the shooting camera. And time-divided into non-shooting periods. For example, the video display control apparatus divides one field section into video signals having a time interval equal to or shorter than one field section by increasing the reading speed of the input video. Then, the video display control device displays the time-division video signal time-divided by the video time-division unit based on the reference synchronization signal by the video display switching unit so that the time-division video signal is not displayed in the shooting period and is displayed in the non-shooting period. Generate a video signal.

  Further, the video display control device generates a color light control signal for controlling the display of the color light that is displayed in the shooting period and not displayed in the non-shooting period by the color light display switching unit with the reference synchronization signal as a reference. By outputting the display video signal and the color light control signal generated in this way to the video display means and the color light display means, the colored light is displayed during the photographing period of the photographing camera and the video is displayed during the non-photographing period. It becomes possible to do.

  According to a second aspect of the present invention, when shooting is performed by a shooting camera that performs a shooting operation based on a reference synchronization signal, one field period of the video signal shot by the shooting camera is not a shooting period. A video display device that is time-divided into a shooting period, displays colored light that is shot by the shooting camera during the shooting period, and displays video that is not shot by the shooting camera during the non-shooting period. The video display control device described above, video display means, and color light display means are provided.

  According to this configuration, the video display device displays the display video signal generated by the video display control device by the video display means, and based on the color light control signal generated by the color light display means by the video display control device. By displaying the colored light, it is possible to display the colored light during the photographing period of the photographing camera and display the video during the non-photographing period.

  Furthermore, the video display device according to claim 3 is the video display device according to claim 2, wherein the video display means includes a movable mirror that displays video by reflecting light from a light source. It is characterized by that.

  According to this configuration, in the video display device, the video display unit includes the movable mirror, and displays the video by reflecting the light from the light source. This image display means displays the image by changing the direction of the reflected light from the light source by adjusting the angle of the movable mirror. The movable mirror is a mirror type projection element in which the inside of the element is divided into a plurality of micromirrors and each micromirror can be switched at high speed. Thus, the video display means can switch and display the time-division video at high speed.

  According to a fourth aspect of the present invention, there is provided the video display device according to the second aspect, wherein the video display means passes or blocks light from a light source based on the display video signal. An opening / closing means is provided.

  According to this configuration, the video display device displays a video for each divided unit by allowing the video light path opening / closing means to pass or block light from the light source based on the display video signal. Note that the image light path opening / closing means may be any device that can open and close the light path based on the display image signal, such as a liquid crystal shutter or a mechanical shutter.

  Furthermore, the video display device according to claim 5 is the video display device according to any one of claims 2 to 4, wherein the color light display means includes a movable mirror, and the movable mirror includes the color light. The color light is displayed by reflecting the color light from the color light source based on the control signal.

  According to such a configuration, the video display device displays the color light by changing the direction of the reflected light of the color light source by adjusting the angle of the movable mirror of the color light display means based on the color light control signal. . Thereby, the video display means can switch and display the color light at high speed.

  According to a sixth aspect of the present invention, there is provided the video display device according to any one of the second to fourth aspects, wherein the color light display means passes or blocks light from a color light source. An optical path opening / closing means is provided, and the color light display means switches the display of the color light by opening and closing the color light path opening / closing means based on the color light control signal.

  According to such a configuration, the video display device displays the color light during the photographing period by opening the color light path opening / closing means (for example, a liquid crystal shutter, a mechanical shutter, etc.) during the photographing period of the photographing camera. Photographed by the camera. In addition, the image display device closes the color light path opening / closing means during the non-shooting period of the photographing camera by the color light display means, so that the colored light is not displayed during the non-shooting period. As a result, when the video is displayed during the non-shooting period, the color of the video and the colored light are not mixed.

  Furthermore, the video display device according to claim 7 is the video display device according to any one of claims 2 to 6, wherein the color light display means displays the color light using a light emitting diode as a color light source. It is characterized by that.

  According to such a configuration, in the video display device, the color light display means displays the color light by the light emitting diode (LED) capable of emitting a specific wavelength with a monochromatic light source. As a result, the video display device can display, for example, blue as a blue back used when performing image composition.

  The video display control apparatus according to claim 8, when shooting with a shooting camera that performs shooting based on a reference synchronization signal, one field period of the video signal shot by the shooting camera is defined as a shooting period. Control for time-dividing into a non-shooting period, displaying a first video shot by the shooting camera during the shooting period, and displaying a second video not shot by the shooting camera during the non-shooting period The video display control apparatus is configured to include a first video time division unit, a second video time division unit, and a video display switching unit.

  According to such a configuration, the video display control apparatus is configured such that the first video time division unit captures one field section of the first video signal captured by the reference synchronization signal (reference synchronization signal) with the photographing camera. Time-sharing. Further, one field section of the second video signal photographed by the reference synchronization signal is time-divided by the second video time division means. For example, the video display control apparatus divides one field section into video signals having a time interval equal to or shorter than one field section by increasing the reading speed of the input video. Then, the video display control device uses the video display switching means to video time-divisionally divided by the first video time-division means (first time-division video signal) and video divided by the second video time-division means. From the (second time-division video signal), a display video signal to be displayed in either the shooting period or the non-shooting period of the shooting camera is generated based on the reference synchronization signal. By outputting the display video signal generated in this way to the video display means, it is possible to display different videos in the shooting period and the non-shooting period of the shooting camera.

  Furthermore, when the video display device according to claim 9 performs shooting by a shooting camera that performs a shooting operation based on a reference synchronization signal, one field period of the video signal shot by the shooting camera is set as a non-shooting period. A video display device that time-divides a shooting period, displays a first video shot by the shooting camera during the shooting period, and displays a second video not shot by the shooting camera during the non-shooting period. Thus, the video display control device according to claim 8 and video display means are provided.

  According to this configuration, the video display device displays the display video signal generated by the video display control device by the video display means. This makes it possible to display different images during the shooting period and the non-shooting period of the shooting camera.

  The video display device according to claim 10 is the video display device according to claim 9, wherein the video display means includes a movable mirror that displays video by reflecting light from a light source. It is characterized by that.

  According to this configuration, in the video display device, the video display unit includes the movable mirror, and displays the video by reflecting the light from the light source. Thus, the video display means can switch and display the time-division video at high speed.

  Furthermore, the video display apparatus according to claim 11 is the video display apparatus according to claim 9, wherein the video display means passes or blocks light from a light source based on the display video signal. An opening / closing means is provided.

  According to this configuration, the video display device displays a video for each divided unit by allowing the video light path opening / closing means to pass or block light from the light source based on the display video signal. The image light path opening / closing means is, for example, a liquid crystal shutter, a mechanical shutter, or the like.

  According to the first or second aspect of the present invention, it is possible to switch and display an image and colored light within one field section. As a result, in a TV studio or the like, a blue background blue can be displayed during the shooting period of the shooting camera, and a video that can be recognized only by performers during the non-shooting period can be displayed. It becomes possible to synthesize other images with the blue back portion. Further, according to the present invention, since the colored light is not displayed during the non-shooting period of the shooting camera, the image and color in the non-shooting period presented to the performer are not mixed. Thereby, even if a color is added to the presentation information presented during the non-photographing period, the performer can recognize the information and can improve the recognizability of the presentation information.

  In addition, according to the present invention, during the non-shooting period of the shooting camera, the video indicating the performer's lines and line-of-sight positions is displayed, thereby reducing the performer's performance burden and making the performer's line of sight natural. It will be a thing. Furthermore, according to the present invention, since the image and the color light can be displayed by a single device, the number of equipment can be reduced. For example, when projecting from the back onto a transmissive screen, it can be installed even in a narrow installation space on the back side.

  According to the third aspect of the present invention, since the video display device includes the movable mirror in the video display means, the projection can be switched at high speed following the switching speed of the video. As a result, the projection efficiency is increased and the visual accuracy can be increased.

  According to the fourth aspect of the present invention, the video display device can switch and output the video for each divided unit by opening and closing the video optical path opening / closing means such as a liquid crystal shutter. Further, by using a liquid crystal shutter as the image light path opening / closing means, the apparatus can be operated with low power consumption.

  According to the fifth aspect of the present invention, since the video light display device includes the movable mirror in the color light display means, the display can be switched at high speed following the switching speed by the color light control signal.

  According to the sixth aspect of the present invention, the video display device can display colored light only during the photographing period of the photographing camera by opening and closing the color light path opening / closing means such as a liquid crystal shutter. Further, by using a liquid crystal shutter as the color light path opening / closing means, the apparatus can be operated with low power consumption.

  According to the seventh aspect of the present invention, since the video display device displays colored light by the light emitting diode, it is possible to irradiate a specific wavelength with a monochromatic light source. As a result, it is possible to display a blue color as a blue background used when performing image composition.

  According to the invention described in claim 8 or claim 9, two different videos can be divided and displayed within one field section. Thus, for example, in a television studio or the like, one video is displayed as a video for shooting with a shooting camera, and the other video is displayed as a video that can be recognized only by performers without being shot by the shooting camera. Can do. In addition, since the video (camera video) shot by the shooting camera and the video not shot by the shooting camera (non-camera video) do not overlap in the same time, the video is easily visible to the performers. In addition, according to the present invention, the video display device can display different videos on a single device, so that the number of equipment can be reduced. For example, when projecting from the back onto a transmissive screen, it can be installed even in a narrow installation space on the back side.

  According to the tenth aspect of the invention, since the video display device includes the movable mirror in the video display means, the projection can be switched at high speed following the switching speed of the video. As a result, the projection efficiency is increased and the visual accuracy can be increased.

  According to the eleventh aspect of the invention, the video display device can switch and output the video for each divided unit by opening and closing the video optical path opening / closing means such as a liquid crystal shutter. Further, by using a liquid crystal shutter as the image light path opening / closing means, the apparatus can be operated with low power consumption.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Outline of video shooting system]
First, with reference to FIG. 6, an outline of a video shooting system used at a shooting site such as a television studio will be described. FIG. 6 is a schematic diagram showing an overall configuration of a video photographing system including a video display device according to the present invention. The video shooting system 1 includes a video display device 10, a transmissive screen 20, and a shooting camera 30.

  The video display device 10 uses the same synchronization signal (reference synchronization signal) as the video camera 30 for video shot by the video camera 30 (video for camera) and video that is not shot by the video camera 30 (video for non-camera). ) Based on SG, the display is switched (projected) between the shooting period of the shooting camera 30 and the non-shooting period. In addition, video (camera video and non-camera video) displayed from the video display device 10 is presented to the performer M via the transmissive screen 20.

The transmissive screen 20 is a rear projection type display device that displays an image projected from the image display device 10 installed on the back side with respect to the display surface, through the front display surface.
Here, the video from the video display device 10 is displayed by the rear projection method. However, when the video display device 10 displays the video by the front projection method, the transmission screen 20 is a reflection screen. The video may be displayed from the performer M side. However, when the performer M stands on the front of the screen, the rear projection method is desirable.

  The photographic camera 30 shoots an image displayed on the transmissive screen 20. The photographing camera 30 performs photographing during a period in which an electronic shutter (not shown) of an internal imaging device (CCD) is open based on the same synchronizing signal (reference synchronizing signal) SG as that of the video display device 10. No shooting is performed while the electronic shutter is closed. The photographing camera 30 may be any camera that can switch between the photographing period and the non-photographing period based on the reference synchronization signal, such as a small news gathering camera, a large studio camera, and a high-definition camera.

  Here, with reference to FIGS. 7 and 8 (refer to FIG. 6 as appropriate), the video displayed by the video display device 10 and the video shot by the shooting camera 30 will be described. FIG. 7 is a diagram illustrating an example of an image displayed on the transmission screen 20 by the image display device 10, where (a) is an image displayed during a non-shooting period of the shooting camera 30, and (b) is a shooting camera 30. It is an image displayed during the shooting period. FIG. 8 is a diagram illustrating an example of an image captured by the imaging camera 30.

  Here, the video display device 10 displays, for example, a weather map as the video SA to be presented to the performer M during the non-shooting period of the shooting camera 30 (see FIG. 7A). In addition, the video display device 10 displays, for example, a single color light as another video SB during the shooting period of the shooting camera 30 (see FIG. 7B). Here, it is assumed that the video display device 10 displays blue light serving as a chroma key back as a single color light during the photographing period of the photographing camera 30.

  At this time, since the photographing camera 30 performs photographing only during the photographing period, as shown in FIG. 8, a video CA including a blue (blue back) video SB as a chroma key back is photographed on the transmissive screen 20. . In the video CA shot by the shooting camera 30, the video SB portion is shot in blue. For example, as shown in FIG. 9, another video is displayed on the blue area by CG (Computer Graphics) or the like. Can be used to create a video CB for a program.

  In addition, here, the video display device 10 includes a blue background color light and a performer as an image (camera image) captured by the imaging camera 30 and an image not captured by the imaging camera 30 (non-camera image). The video presented to M is displayed, but a different video may be displayed. Alternatively, either one of the camera video or the non-camera video may be displayed.

[Configuration of Video Display Device: First Embodiment]
Next, the configuration of the video display apparatus according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the video display apparatus. As shown in FIG. 1, the video display device 10 switches and displays video (video signal) and colored light. Here, the video display device 10 includes a video time division unit 11, a synchronization control unit 12, a video display switching unit 13, a color light display switching unit 14, a video display unit 15, and a color light display unit 16. Yes.

  The video time division means 11 time-divides one field section of the input video signal based on an external synchronization signal (reference synchronization signal). This synchronization signal is a signal for synchronizing with the photographing camera 30 (see FIG. 6). Here, the video time division means 11 includes a synchronization separation circuit 11a, a vertical synchronization separation circuit 11b, a write timing signal generation circuit 11c, a read timing signal generation circuit 11d, and a scan conversion circuit 11e.

  The synchronization separation circuit 11a separates a composite synchronization signal composed of a vertical synchronization signal and a horizontal synchronization signal, which serve as a reference for synchronization of the video signal, from the input video signal. The composite synchronization signal separated here is output to the vertical synchronization separation circuit 11b and the write timing signal generation circuit 11c. The vertical synchronization signal is a signal indicating the start of one screen when displaying an image. The horizontal synchronization signal is a signal indicating the start of scanning in the horizontal direction of the screen when displaying an image.

  The vertical synchronization separation circuit 11b separates the vertical synchronization signal from the composite synchronization signal separated from the video signal by the synchronization separation circuit 11a. The separated vertical synchronization signal is output to the write timing signal generation circuit 11c.

  The write timing signal generation circuit 11c receives the composite synchronization signal output from the synchronization separation circuit 11a and the vertical synchronization signal output from the vertical synchronization separation circuit 11b, and writes the video signal to the scan conversion circuit 11e described later. A write timing signal is generated. The write timing signal generated here is output to the scan conversion circuit 11e.

  The read timing signal generation circuit 11d generates a read timing signal indicating the timing for reading the video signal written in the scan conversion circuit 11e based on the write timing signal generated by the write timing signal generation circuit 11c. The readout timing signal generated here is output to the scan conversion circuit 11e. Note that the readout timing signal generation circuit 11d is based on a synchronization signal input from the outside and an electronic shutter synchronization signal indicating a synchronization signal with an electronic shutter output from the synchronization control means 12 described later. A readout timing signal is generated at a double speed of the frequency of the video signal, for example, 5 times the speed, in synchronization with the timing of the electronic shutter (see FIG. 6). Note that this read timing signal can be n-times speed (n is an integer of 2 or more).

  The scan conversion circuit 11e writes the input video signal to a memory (not shown) based on the write timing signal generated by the write timing signal generation circuit 11c, and the read timing generated by the read timing signal generation circuit 11d. Based on the signal, the video signal is read from the memory and output. For example, when the video signal read by the scan conversion circuit 11e is read by a 5 × speed read timing signal, the video signal in one field section is divided into five. The video signal (time-division video signal) divided by the scan conversion circuit 11e is output to the signal switching circuit 13a of the video display switching means 13.

  The synchronization control means 12 generates an electronic shutter synchronization signal indicating a synchronization signal with the electronic shutter of the photographing camera 30 (see FIG. 6) based on an external synchronization signal. Here, the synchronization control means 12 includes a vertical synchronization separation circuit 12a and a delay circuit 12b.

  The vertical synchronization separation circuit 12a separates the vertical synchronization signal from the synchronization signal. The vertical synchronization signal separated here is output to the delay circuit 12b.

  The delay circuit 12b delays the vertical synchronization signal output from the vertical synchronization separation circuit 12a based on a predetermined synchronization signal and a delay amount between the electronic shutter signal and generates an electronic shutter synchronization signal. . The electronic shutter synchronization signal generated here is output to the readout timing signal generation circuit 11d of the video time division unit 11 and the readout time setting circuit 13b of the video display switching unit 13. The delay amount may be set from the outside. The synchronization control means 12 can be removed from the configuration of the video display device 10 when an electronic shutter synchronization signal is input from the outside.

  The video display switching means 13 converts the video signal time-divided by the video time division means 11 (time-division video signal) to ON (shooting period) or OFF (non-shooting period) of the electronic shutter in the shooting camera 30 (FIG. 6). The display video signal to be switched at the timing is generated. Here, the video display switching means 13 includes a signal switching circuit 13a and a readout time setting circuit 13b.

  The signal switching circuit 13a outputs the video signal (time-division video signal) time-divided by the video time-division means 11 based on the electronic shutter signal indicating ON / OFF of the electronic shutter output from the readout time setting circuit 13b. , Switching and outputting. Here, the signal switching circuit 13a outputs the time-division video signal time-divided by the video time-division means 11 when the electronic shutter signal is OFF (non-shooting period). Further, when the electronic shutter signal is ON (shooting period), the signal switching circuit 13a stops the output of the time-division video signal time-divided by the video time-division means 11. Note that the video signal (display video signal) switched by the signal switching circuit 13 a is output to the projection element driving circuit 15 a of the video display means 15.

  The readout time setting circuit 13b generates an electronic shutter signal indicating the timing of ON (shooting period) or OFF (non-shooting period) of the electronic shutter. Here, the readout time setting circuit 13b includes an electronic shutter synchronization signal indicating a synchronization signal with the electronic shutter output from the synchronization control means 12, a predetermined electronic shutter ON time, and an electronic shutter OFF time. Based on the above, an electronic shutter signal indicating ON / OFF timing of the electronic shutter is generated. The electronic shutter signal generated here is output to the signal switching circuit 13a and the color light switching circuit 14a of the color light display switching means 14. Based on the electronic shutter signal, the signal switching circuit 13a and the color light switching circuit 14a can determine whether the photographing camera is ON (shooting period) and OFF (non-shooting period).

  The color light display switching unit 14 generates a color light control signal for controlling whether or not to display color light to the color light display unit 16. Here, the color light display switching means 14 includes a color light switching circuit 14a.

  The color light display switching circuit 14a turns the electronic shutter ON (shooting period) or OFF with respect to the color light display means 16 based on the electronic shutter signal indicating ON / OFF of the electronic shutter output from the readout time setting circuit 13b. A colored light control signal for displaying colored light is generated at any one timing of (non-shooting period). Here, the color light switching circuit 14a outputs a color light control signal to the color light display means 16 to instruct display.

  The video display means 15 displays the display video signal switched by the video display switching means 13. Here, the video display means 15 includes a projection element driving circuit 15a, a projection element 15b, a color filter 15c, and a light source 15d.

  The projection element drive circuit 15a generates a drive signal for driving the movable mirror of the projection element 15b based on the video signal (display video signal) output from the signal switching circuit 13a. This drive signal is output to the projection element 15b and the color filter 15c.

  The projection element 15b includes a plurality of divided movable mirrors, and switches the direction of the reflected light with respect to the incident light from the light source 15d based on the drive signal output from the projection element drive circuit 15a. The video is output. For the projection element 15b, for example, a general element such as DMD (Digital Micromirror Device) or GLV (Grating Light Valve) can be used. As described above, by using the element including the movable mirror, the opening / closing operation can be performed at a higher speed than the liquid crystal shutter, and the transmission efficiency of the image can be increased.

The color filter 15c divides the light from the light source 15d into RGB (red, green, blue) colors based on the drive signal output from the projection element drive circuit 15a. The projection element 15b displays an image using each of the RGB color light beams dispersed here as incident light. The color filter 15c may be a spectral means such as a prism.
The light source (lamp) 15d generates incident light to the projection element 15b, and uses, for example, a UHE (ultra-high pressure mercury) lamp.

  The colored light display means 16 displays colored light based on the colored light control signal output from the colored light display switching means 14. Here, the color light display means 16 includes an LED drive circuit 16a and an LED (color light source) 16b.

  The LED drive circuit 16a generates a drive signal for driving the LED (color light source) 16b based on the color light control signal output from the color light switching circuit 14a of the color light display switching means 14. This drive signal is output to LED (color light source) 16b. Here, the LED (color light source) 16b performs display of colored light during the period (shooting period) when the electronic shutter in the drive signal is ON.

  A plurality of LEDs (color light sources) 16b are light emitting diodes (LEDs), and a plurality of LEDs can be used to obtain necessary brightness. Since the LED is an element that can be ON / OFF controlled at high speed by controlling the current, the LED can emit light in synchronization with a period during which the electronic shutter is ON (photographing period).

  Here, by setting the LED (color light source) 16b to emit blue light, when the electronic shutter is ON (shooting period), blue color light is displayed and the electronic shutter is OFF (non-shooting period). In this case, the video display system 15 shown in FIG. 6 can be realized by displaying the video by the video display means 15.

  In the case where the display image displayed by the image display means 15 and the color light displayed by the color light display means 16 are displayed on the same optical axis, as shown in FIG. 5, the optical axis provided with the half mirror 61. By using the changing unit 60, it is possible to display the display image and the color light from the same lens.

  As described above, by configuring the video display device 10, the video display device 10 switches between video and colored light in one field section of the video in accordance with the ON / OFF timing of the electronic shutter in the photographing camera. Can be displayed. For example, the video display device 10 displays a video during a period when the electronic shutter is OFF, that is, a non-shooting period of the shooting camera, and displays colored light during a period when the electronic shutter is ON, that is, a shooting period of the shooting camera. Video that is not shot by the camera can be presented to the performers. Further, by setting the color light to blue as a chroma key back, it is possible to perform image composition on the video shot by the shooting camera.

  In addition, since the video display device 10 does not display colored light during the period of information presentation by video, the performer can easily recognize the presented information and adds color to the presented information. Also, the performer can recognize the color.

Note that the present invention is not limited to this. For example, here, a movable mirror is used for the projection element 15b of the image display means 15, and an LED (color light source) 16b is used for the color light display means 16. However, a liquid crystal shutter (image optical path opening / closing means; not shown) is used for the projection element 15b. Using a combination of a general light source and a liquid crystal shutter (color optical path opening / closing means; not shown) to the LED (color light source) 16b, the projection element drive circuit 15a and the LED drive circuit 16a are adapted to open and close the electronic shutter. The liquid crystal shutter (video light path opening / closing means, color light path opening / closing means) may be opened and closed. Here, the liquid crystal shutter is an element that transmits and blocks light by causing an alignment change of liquid crystal molecules by applying or removing an electric field to the liquid crystal molecules. Further, a mechanical shutter may be used for switching between these images and color light.
Further, the video display unit 15 and the color light display unit 16 may be omitted from the video display device 10 and separated from the video display control device 20.

[Operation of video display device]
Next, the operation of the video display apparatus according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a time chart showing main signals for explaining the operation of the video display apparatus.
It is assumed that the video signal a, which is a video signal, is input to the video time division unit 11 in the video display device 10. Furthermore, it is assumed that the same synchronization signal as that of the photographing camera 30 (see FIG. 6) is input to the synchronization control means 12 in the video display device 10. In FIG. 2, a horizontal synchronizing signal is not shown in the video signal a for the sake of simplicity.

(Video time division step)
First, the video display device 10 separates the composite sync signal composed of the vertical sync signal and the horizontal sync signal from the video signal (“video signal a” in FIG. 2) by the sync separator circuit 11a of the video time division means 11. . Then, the vertical synchronization signal is separated from the composite synchronization signal by the vertical synchronization separation circuit 11b. The video display device 10 also includes a scan conversion circuit 11e based on the composite synchronization signal separated by the synchronization separation circuit 11a and the vertical synchronization signal separated by the vertical synchronization separation circuit 11b by the write timing signal generation circuit 11c. A write timing signal for is generated. Then, the video display device 10 writes the video signal a in a memory (not shown) by using the scan conversion circuit 11e with reference to the write timing signal.

  Further, the video display device 10 separates the vertical synchronization signal (“vertical synchronization signal b of the photographing camera” in FIG. 2) from the synchronization signal by the vertical synchronization separation circuit 12 a of the synchronization control means 12. Then, in the video display device 10, the delay circuit 12b delays the vertical synchronization signal output from the vertical synchronization separation circuit 12a based on the delay amount between the predetermined synchronization signal and the electronic shutter signal ("" in FIG. 2). Delayed vertical sync signal c "). Thus, the delayed vertical synchronization signal becomes a signal (electronic shutter synchronization signal) synchronized with an electronic shutter signal (“electronic shutter signal d of the photographing camera” in FIG. 2) indicating ON / OFF of the electronic shutter.

  Then, the video display device 10 uses the electronic shutter based on the synchronization signal input from the outside and the electronic shutter synchronization signal input from the synchronization control unit 12 by the readout timing signal generation circuit 11d of the video time division unit 11. A read timing signal synchronized with the timing is generated. Then, the scan conversion circuit 11e divides and reads the video signal (“video signal a” in FIG. 2) from a memory (not shown) based on the readout timing signal (“time division of the scan conversion circuit in FIG. 2). Video signal e ").

(Video / color light display switching step)
In addition, the video display device 10 uses the video display switching means 13 to turn the electronic shutter ON (shooting period) or OFF (non-shooting period) from the vertical synchronization signal delayed by the delay circuit 12b by the readout time setting circuit 13b. An electronic shutter signal indicating timing is generated. This electronic shutter signal is the same signal as the electronic shutter signal d of the photographing camera in FIG. Then, the video display device 10 outputs a display video signal corresponding to the electronic shutter OFF period (non-shooting period) with the time-division video signal e by the signal switching circuit 13a ("display video signal f" in FIG. 2). ).

  Further, the video display device 10 uses the color light switching circuit 14a of the color light display switching means 14 to turn on the color light for the LED (color light source) 16b, which is turned on during the electronic shutter ON period (shooting period), similar to the electronic shutter signal d. A color light control signal (“color light control signal g” in FIG. 2) indicating a display instruction is generated.

(Video / color light display step)
Then, the video display device 10 receives a drive signal for driving the movable mirror of the projection element 15b from the video signal (display video signal f) output from the signal switching circuit 13a by the projection element drive circuit 15a of the video display means 15. Generate.
Then, the video display device 10 displays a video based on the drive signal generated by the projection element drive circuit 15a by the projection element 15b.

In the video display device 10, the LED drive circuit 16 a of the color light display means 16 generates a drive signal for driving the LED (color light source) 16 b from the color light control signal g output from the color light display switching circuit 14 a.
And the video display apparatus 10 displays colored light by LED (color light source) 16b based on the drive signal produced | generated by the LED drive circuit 16a.

Through the above operation, the video display device 10 can time-divide one field section of video and switch between video and colored light according to the timing of the electronic shutter of the photographing camera.
Thus, for example, the color light displayed during the photographing period of the photographing camera is set to blue (blue back) as a chroma key back, so that it is projected on the transmissive screen 20 photographed by the photographing camera 30 as shown in FIG. The synthesized video CB shown in FIG. 9 can be generated by performing image synthesis using the blue background as a key signal (a signal for clipping).

[Configuration of Video Display Device: Second Embodiment]
Next, with reference to FIG. 3, the structure of the video display apparatus according to the second embodiment of the present invention will be described. FIG. 3 is a block diagram illustrating a configuration of the video display device. As shown in FIG. 3, the video display device 10B switches two videos (video signals) and outputs them as a display video. Here, the video display device 10B includes a first video time division unit 11A, a second video time division unit 11B, a synchronization control unit 12, a video display switching unit 13B, and a video display unit 15. Yes.

The video display device 10B omits the color light display switching unit 14 and the color light display unit 16 from the configuration of the video display device 10 described in FIG. 1, and includes two video time division units 11 (11A and 11B). Further, the video display device 10B is configured by replacing the video display switching unit 13 of FIG. 1 with the video display switching unit 13B whose function is changed.
Since the configuration other than the video display switching unit 13B is the same as the configuration of the video display device 10 described in FIG. 1, the same reference numerals are given and the description thereof is omitted. The video signals input to the video time division unit 11A and the video time division unit 11B are different video signals.

The video display switching unit 13B turns on the electronic shutter (shooting period) of the video signal (time-division video signal) divided by the video time division unit 11A and the video time division unit 11B, respectively. ) Or OFF (non-shooting period). Here, the video display switching means 13B includes a signal switching circuit 13a ₂ and a readout time setting circuit 13b ₂ .

The signal switching circuit 13a ₂ is an electronic shutter for the electronic shutter that outputs the video signals (time-division video signals) time-divided by the video time-division means 11A and the video time-division means 11B, respectively, from the readout time setting circuit 13b ₂ . Based on an electronic shutter signal indicating ON / OFF, the signal is switched and output. Here, the signal switching circuit 13a ₂ outputs the time-division video signal time-divided by the video time-division means 11A when the electronic shutter signal is OFF (non-shooting period). Further, when the electronic shutter signal is ON (shooting period), the signal switching circuit 13a ₂ outputs the time-division video signal time-divided by the video time-division means 11B. The video signal (display video signal) switched by the signal switching circuit 13a ₂ is output to the projection element driving circuit 15a of the video display means 15.

The readout time setting circuit 13b ₂ generates an electronic shutter signal indicating the timing when the electronic shutter is ON (shooting period) or OFF (non-shooting period). Here, the readout time setting circuit 13b ₂ is an electronic shutter synchronization signal indicating a synchronization signal with the electronic shutter output from the synchronization control means 12, a predetermined electronic shutter ON time, and an electronic shutter OFF time. Based on the above, an electronic shutter signal indicating the ON / OFF timing of the electronic shutter is generated. The generated electronic shutter signal is outputted to the signal switching circuit 13a _2. Based on this electronic shutter signal, the signal switching circuit 13a ₂ can determine whether the photographing camera is ON (shooting period) or OFF (non-shooting period).

As described above, by configuring the video display device 10B, the video display device 10B time-divides different videos (video signals) into a plurality of videos within one field section, and turns on an electronic shutter in the photographing camera. In accordance with the / OFF timing, one video can be displayed during a period when the electronic shutter is ON, that is, a shooting period, and the other video can be displayed during a period when the electronic shutter is OFF, that is, a non-shooting period.
Also in this configuration, the video display unit 15 may be omitted from the video display device 10B and separated from the video display control device 20B.

[Operation of video display device]
Next, with reference to FIGS. 3 and 4, the operation of the video display apparatus according to the second embodiment of the present invention will be described. FIG. 4 is a time chart showing main signals for explaining the operation of the video display apparatus.
In the video display device 10B, the video signal a that is the first video signal is input to the video time division unit 11A, and the video signal b that is the second video signal is input to the video time division unit 11B. . Furthermore, it is assumed that the same synchronization signal as that of the imaging camera 30 (see FIG. 6) is input to the synchronization control means 12 in the video display device 10B. In FIG. 4, the horizontal synchronizing signal is not shown in the video signal a and the video signal b in order to simplify the drawing.

(Video time division step)
First, the video display device 10B separates the composite sync signal composed of the vertical sync signal and the horizontal sync signal from the video signal (“video signal a” in FIG. 4) by the sync separator circuit 11a of the video time division means 11A. . Then, the vertical synchronization signal is separated from the composite synchronization signal by the vertical synchronization separation circuit 11b. In addition, the video display device 10B has a scan conversion circuit 11e based on the composite synchronization signal separated by the synchronization separation circuit 11a and the vertical synchronization signal separated by the vertical synchronization separation circuit 11b by the write timing signal generation circuit 11c. A write timing signal for is generated. Then, the video display device 10B writes the video signal a in a memory (not shown) by using the scan conversion circuit 11e with reference to the write timing signal.

  The video display device 10B operates in the video time division unit 11B in the same manner as the video time division unit 11A, and the scan conversion unit 11e uses the video signal (“video signal b” in FIG. 4) with the write timing signal as a reference. ) In a memory not shown.

  Further, the video display device 10B separates the vertical synchronization signal ("vertical synchronization signal c of the photographing camera" in FIG. 4) from the synchronization signal by the vertical synchronization separation circuit 12a of the synchronization control means 12. In the video display device 10B, the delay circuit 12b delays the vertical synchronization signal output from the vertical synchronization separation circuit 12a based on the delay amount between the predetermined synchronization signal and the electronic shutter signal (see “ Delayed vertical sync signal d "). Accordingly, the delayed vertical synchronization signal becomes a signal (electronic shutter synchronization signal) synchronized with an electronic shutter signal (“electronic shutter signal e of the photographing camera” in FIG. 4) indicating ON / OFF of the electronic shutter.

  Then, the video display device 10B uses the electronic shutter based on the synchronization signal input from the outside and the electronic shutter synchronization signal input from the synchronization control unit 12 by the readout timing signal generation circuit 11d of the video time division unit 11A. A read timing signal synchronized with the timing is generated. Then, the scan conversion circuit 11e divides and reads the video signal (“video signal a” in FIG. 4) from a memory (not shown) based on the read timing signal (“time division of the scan conversion circuit in FIG. 4). Video signal f ").

  The video display device 10B operates in the video time division unit 11B in the same manner as the video time division unit 11A, and the video signal (“video signal b” in FIG. 4) is read from the memory (not shown) by the scan conversion unit 11e. Are read out (“time-division video signal g of the scan conversion circuit” in FIG. 4).

(Video display switching step)
The video display apparatus 10B, the image display switching means 13B, read by the time setting circuit 13b _2, the vertical synchronizing signal delayed by the delay circuit 12b, ON electronic shutter (shooting period) or OFF (non-shooting period) An electronic shutter signal indicating the timing is generated. This electronic shutter signal is the same signal as the electronic shutter signal e of the photographing camera in FIG. Then, by the signal switching circuit 13a ₂ , the video signal a that is the first video signal is supplied during the OFF period of the electronic shutter, and the video signal b that is the second video signal is supplied during the ON period of the electronic shutter. Output (“display video signal h” in FIG. 4).

(Video display step)
The video display apparatus 10B, the projection device drive circuit 15a of the image display unit 15, from the video signal output from the signal switching circuit 13a ₂ (display video signal), a driving signal for driving the movable mirror projection elements 15b Generate.
Then, the video display device 10B displays a video based on the drive signal generated by the projection element driving circuit 15a by the projection element 15b.
Through the above operation, the video display device 10B divides different videos (video signals) into a plurality of videos each within one field section, and captures one of the videos according to the timing of the electronic shutter of the shooting camera. The other video can be displayed in the non-shooting period of the shooting camera.

For example, when the read timing signal generation circuit 11d generates a read timing signal at a speed five times the period of the vertical synchronization signal, as shown in FIG. 4, the display video signal h output from the signal switching circuit 13a ₂ The first two fields (g1, g2) display the video of the video signal b, and the subsequent three fields (f3, f4, f5) display the video of the video signal a. In this case, since the time of one field of the photographing camera is 16.67 milliseconds, the display time of the video signal b is 16.67 × 2 ÷ 5 = 6.67 (milliseconds).

When a 1/100 (1/100) second electronic shutter is used as the photographing camera 30, the exposure time of one field section is 10.00 milliseconds, and the non-exposure time is 16.67-10.00 = 6.67 (milliseconds). That is, the non-exposure time (6.67 milliseconds) of the photographing camera 30 is equal to the display time (16.67 milliseconds) of the video signal b. In this way, by displaying the video signal b in accordance with the non-exposure time when the electronic shutter of the photographing camera 30 is closed, only the image of the video signal a is photographed on the photographing camera 30, and the image of the video signal b is It will not be filmed.
With the above operation, the video display device 10B can time-divide one field section of the video and switch and display a plurality of videos in accordance with the timing of the electronic shutter of the photographing camera.

It is a block diagram which shows the structure of the video display apparatus which concerns on the 1st Embodiment of this invention. It is a time chart for demonstrating operation | movement of the video display apparatus concerning the 1st Embodiment of this invention. It is a block diagram which shows the structure of the video display apparatus which concerns on the 2nd Embodiment of this invention. It is a time chart for demonstrating operation | movement of the video display apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows an example of an optical axis change means. 1 is a schematic diagram showing an overall configuration of a video shooting system including a video display device according to the present invention. It is a figure which shows an example of the image | video displayed on the transmissive screen by the video display apparatus which concerns on this invention, Comprising: (a) is an image | video displayed during the non-shooting period of a camera, (b) is a shooting period of a camera. It is a figure which shows the image | video displayed. It is a figure which shows an example of the image | video which the imaging | photography camera image | photographed. It is a figure which shows the image | video for programs produced | generated from the image | video which the imaging | photography camera image | photographed. It is a schematic diagram of the television studio for demonstrating the information presentation technique by the conventional intermittent light. It is a time chart which shows the relationship of each signal of an electronic shutter and a liquid-crystal shutter. It is a time chart which shows the video signal which divided | segmented the image | video in 1 field by the information presentation technique by the conventional intermittent light.

Explanation of symbols

1 Video shooting system 10, 10B
Video display device 11 Video time division means 11A First video time division means 11B Second video time division means 12 Synchronization control means 13, 13B
Video display switching means 14 Color light display switching means 15 Video display means 16 Color light display means 20 Transmission type screen 30 Shooting camera

Claims (11)

When shooting is performed by a shooting camera that performs shooting based on a reference synchronization signal, one field period of a video signal shot by the shooting camera is time-divided into a shooting period and a non-shooting period, and the shooting period includes the shooting period. A video display control device that displays color light captured by a photographing camera and performs control for displaying a video that is not photographed by the photographing camera during the non-photographing period,
Video time division means for time-dividing one field section of a video signal shot based on the reference synchronization signal into the shooting period and the non-shooting period;
Video display switching means for generating a display video signal in which the time-division video signal time-divided by the video time-division means is not displayed in the shooting period and is displayed in the non-shooting period based on the reference synchronization signal; ,
Based on the reference synchronization signal, color light display switching means for generating a color light control signal for controlling the display of the color light that is displayed in the photographing period and is not displayed in the non-photographing period;
A video display control device comprising: When shooting is performed by a shooting camera that performs shooting based on a reference synchronization signal, one field period of a video signal shot by the shooting camera is time-divided into a shooting period and a non-shooting period, and the shooting period includes the shooting period. A video display device for displaying colored light photographed by a photographing camera and displaying images not photographed by the photographing camera during the non-photographing period;
A video display control device according to claim 1;
Video display means for displaying a display video signal generated by the video display control device;
Color light display means for displaying the color light based on a color light control signal generated by the video display control device;
A video display device comprising:   The video display device according to claim 2, wherein the video display means includes a movable mirror that displays a video by reflecting light from a light source.   3. The video display device according to claim 2, wherein the video display means includes video light path opening / closing means for passing or blocking light from a light source based on the display video signal. The color light display means includes a movable mirror;
5. The image according to claim 2, wherein the movable mirror displays the color light by reflecting color light from a color light source based on the color light control signal. 6. Display device. The color light display means includes color light path opening / closing means for passing or blocking light from a color light source,
5. The color light display means switches display of the color light by opening and closing the color light path opening / closing means based on the color light control signal. The video display device described.   7. The video display device according to claim 2, wherein the color light display unit displays the color light using a light emitting diode as a color light source. When shooting is performed by a shooting camera that performs shooting based on a reference synchronization signal, one field period of a video signal shot by the shooting camera is time-divided into a shooting period and a non-shooting period, and the shooting period includes the shooting period. A video display control device that performs control for displaying a first video shot by a shooting camera and displaying a second video not shot by the shooting camera during the non-shooting period,
First video time division means for time-dividing one field section of the first video signal imaged based on the reference synchronization signal;
Second video time division means for time-dividing one field section of a second video signal imaged based on the reference synchronization signal;
Based on the reference synchronization signal, the first time-division video signal time-divided by the first video time-division means and the second time-division video signal time-divisionally divided by the second video time-division means. And video display switching means for generating a display video signal to be displayed in either the shooting period or the non-shooting period, respectively.
A video display control device comprising: When shooting is performed by a shooting camera that performs shooting based on a reference synchronization signal, one field period of a video signal shot by the shooting camera is time-divided into a shooting period and a non-shooting period, and the shooting period includes the shooting period. A video display device for displaying a first video shot by a shooting camera and displaying a second video not shot by the shooting camera during the non-shooting period;
The video display control device according to claim 8,
Video display means for displaying a display video signal generated by the video display control device;
A video display device comprising:   The video display device according to claim 9, wherein the video display means includes a movable mirror that displays video by reflecting light from a light source.   10. The video display apparatus according to claim 9, wherein the video display means includes video light path opening / closing means for passing or blocking light from a light source based on the display video signal.

Images