JP2011097346A - Video viewing system and control method of shutter glasses - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect an inclination in a user's pupil distance direction without significantly increasing the power consumption of shutter glasses, and allow only users in a good viewing posture to view 3D images. <P>SOLUTION: Shutter control signals that are polarized to control right and left eye shutters are received through a polarizer at a switching timing of right and left eye images. Based on the amplitude level of the received shutter control signals, the inclination of the shutter glasses is detected, and the right and left eye shutters are controlled. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a video viewing system that enables 3D video viewing and a method for controlling shutter glasses.

  There is a technology that enables viewing three-dimensional (hereinafter, 3D) video in a pseudo manner by using different parallax between the left and right eyes of a human to show different videos to the left and right eyes. As a method using glasses, a polarization method using polarized light, a spectroscopic method using differences in color spectrum characteristics, time-division display of left and right images, and time-division that shows different images to the left and right eyes using shutter-type glasses The system has been put into practical use.

  In general, in 3D video using parallax, the image shift direction between the image for the left eye and the image for the right eye is produced so as to coincide with the eye width direction of the viewing user. Stereoscopic sickness occurs due to contradiction of convergence adjustment that causes contradiction in depth perception due to convergence and focus when viewing 3D images with the eye width direction tilted relative to the image shift direction, that is, the face tilted There is a problem of doing.

  As a method for detecting the tilt of the face, a technique for detecting by a tilt sensor provided in shutter-type glasses, or a technique for detecting the tilt by detecting the positional relationship between the left and right eyes with a camera provided in the video display unit. Is described in Patent Document 1. With respect to the above problem, in Patent Document 1, the shutter unit of the shutter-type glasses is driven so that a two-dimensional (hereinafter referred to as 2D) image is viewed instead of a 3D image while the user is viewing with a tilted face. Techniques for controlling are disclosed.

  Further, as a technique for detecting the rotation angle of two objects, a technique for obtaining a shift due to a phase difference between two polarizing lenses based on light transmitted through the polarizing lens (Patent Document 2) is disclosed.

JP 2001-296501 A Japanese Patent Laid-Open No. 08-285553

  However, when detecting the tilt of the face from the positional relationship of the eyes photographed by the camera, the power consumption increases by providing a mechanism for driving the camera. In addition, the circuit scale becomes large in order to control the shutter glasses individually according to the detected inclinations of the plurality of users. Further, when a tilt sensor such as a gyro sensor or an acceleration sensor is mounted on the shutter-type spectacles in order to individually control the video viewing state of a plurality of users, the power consumption of the shutter-type spectacles is reduced by the power for driving the tilt sensor. There was a problem of a significant increase.

  Therefore, an object of the present invention is to detect the inclination of the user's eye width direction without significantly increasing the power consumption of the shutter-type spectacles, and to suppress the sickness caused by the user's viewing posture.

  In order to achieve the above object, the video viewing system of the present invention includes a left-eye shutter and a right-eye according to the switching timing of the left-eye image and the right-eye image displayed in a stereoscopic manner on the display unit. In a video viewing system comprising a shutter-type eyeglass for controlling a shutter for a shutter and a transmission device for transmitting a shutter control signal for controlling the shutter of the shutter-type eyeglass, the transmission device transmits the shutter control signal. The shutter control signal having the transmission unit and the first polarization unit that performs polarization processing on the shutter control signal transmitted by the transmission unit, wherein the shutter-type spectacles are subjected to polarization processing by the first polarization unit. A second polarizing means for performing polarization processing so that the eye width direction of the shutter-type spectacles is transmitted at a higher transmittance as the eye width direction is closer to a predetermined reference direction, Receiving means for receiving the shutter control signal transmitted from the transmitting means in the transmitter via the first polarizing means and the second polarizing means; and an amplitude level of the shutter control signal received by the receiving means. And a left eye displayed on the display unit when the detection means detects that the inclination of the shutter glasses is less than a predetermined threshold. The left eye shutter and the right eye shutter are controlled so that the image for the right eye and the image for the right eye are stereoscopically viewed, and the detection means detects that the tilt of the shutter-type glasses is equal to or greater than a predetermined threshold value. Control for controlling the left-eye shutter and the right-eye shutter so that the left-eye image and the right-eye image displayed on the display unit are not stereoscopically viewed. And having a stage, a.

  By polarizing and using a shutter control signal for synchronizing the video to be displayed with the shutter portion of the shutter glasses, the stereoscopic effect caused by the viewing posture of the user can be achieved without significantly increasing the power consumption of the shutter glasses. It becomes possible to suppress sickness.

It is a block diagram of the video viewing system in Example 1 of this invention. It is a conceptual diagram which shows polarized infrared transmission by two polarizers parallel to a reference direction. It is a conceptual diagram which shows the signal change of polarized infrared rays by the polarizer which has an inclination angle with respect to a reference direction. It is a block diagram which shows the structure of the signal receiving part in Example 1 of this invention. It is a conceptual diagram which shows a synchronizing signal, an identification signal, and an enable signal in Example 1 of this invention. 4 is a flowchart for explaining operations of a control unit and a shutter unit in Embodiment 1 of the present invention. It is a conceptual diagram which shows the shutter control method of a shutter part. It is a block diagram of the video viewing system in Example 2 of this invention. It is a block diagram which shows the structure of the signal receiving part in Example 2 of this invention. It is a conceptual diagram which shows a synchronizing signal, an identification signal, and an enable signal in Example 2 of this invention. It is a conceptual diagram which shows a synchronizing signal, an identification signal, and an enable signal in Example 2 of this invention.

Example 1
Embodiment 1 of the present invention will be described below.

  FIG. 1 is a block diagram of a video viewing system that implements the first embodiment. The 3D video viewing device includes the video processing device 100 and shutter glasses 150.

  First, the video processing apparatus 100 will be described. A tuner unit 101 demodulates a digital broadcast wave received by an antenna into time-division multiplexed TS (Transport Stream) data including a video signal and an audio signal corresponding to a designated broadcast channel, and a descrambler unit 102 Output to. The descrambler unit 102 descrambles the scrambled TS signal and outputs the descrambled TS signal to the TS separation unit 103.

  The TS separation unit 103 separates and extracts the video signal and audio signal corresponding to the designated broadcast channel, additional data, and the like from the descrambled TS signal, and the video signal and audio signal are respectively extracted from the video decoder unit 105. And supplied to the audio decoder unit 108.

  The external input unit 104 also functions as a network controller for realizing a network connection such as Ethernet (registered trademark) or IEEE 1394 (Institut of Electrical and Electronic Engineers 1394). The signal input from the external input unit 104 that receives the input of the video signal and the audio signal from the external device is output to the TS separation unit 103 and separated into the video signal and the audio signal, and the video decoder unit 105 and the audio decoder unit 108 are separated. To be supplied.

  The video decoder unit 105 decodes the video signal received from the TS separation unit 103 and transmits the decoded video signal to the video output control unit 106. Similarly, the audio decoder unit 108 decodes the audio signal received from the TS separation unit 103 and transmits it to the audio output control unit 109. When the 3D video signal composed of the left-eye image and the right-eye image is decoded by the video decoder unit 105, the video output control unit 106 switches the decoded left-eye image and right-eye image alternately, Output to the video display unit 107. As a result, a video that enables 3D video viewing using the shutter glasses 150 is displayed on the video display unit 107. The audio output control unit 109 outputs the audio signal input from the audio decoder unit 108 to the speaker unit 110.

  The remote control unit 121 converts key operation information by the user into an infrared signal and outputs the infrared signal to the remote control reception unit 114. The remote control receiving unit 114 receives the infrared signal from the remote control unit 121, converts it into key operation information, and transmits it to the control unit 111.

  The control unit 111 controls the entire video processing apparatus 100 in accordance with a user request transmitted via the remote control reception unit 114. In addition, the control unit 111 controls the shutter switching for the shutter-type glasses 150 to control the shutter switching operation between the light shielding state and the non-light shielding state of the shutter unit 152 in synchronization with the video displayed on the video display unit 107. Generate a signal.

  The signal transmission unit 112 modulates the shutter control signal generated by the control unit 111 into an infrared signal and outputs the infrared signal through the polarizer 113. The signal transmission unit 112 and the polarizer 113 are not limited to the configuration in the video processing apparatus 100 as shown in FIG. 1, and may be an external device that can communicate with the video processing apparatus 100.

  Next, the shutter glasses 150 will be described. The signal reception unit 154 receives the shutter control signal incident from the signal transmission unit 112 via the polarizer 113 and the polarizer 153, and transmits the shutter control signal demodulated into an electrical signal to the control unit 151. Based on the shutter control signal obtained from the signal receiving unit 154, the control unit 151 performs control to alternately switch the left-eye shutter 152L and the right-eye shutter 152R between a light shielding state and a non-light shielding state. The operation unit 155 uses a power ON / OFF operation of the shutter-type eyeglasses 150 and various setting buttons for setting a threshold value to be described later, and these operation information is transmitted to the control unit 151.

  Next, the installation relationship between the polarizer 113 and the polarizer 153 will be described with reference to FIG. The polarizer 113 performs a polarization process for filtering the shutter control signal modulated by the infrared signal or the like of the omnidirectional light output from the signal transmission unit 112 so that the vibration direction of the electric field (and magnetic field) becomes a regular light wave. Apply. Here, the reference direction is the image shift direction between the left-eye image and the right-eye image to be displayed, or the horizontal direction with respect to the installation surface of the video display device by the video processing device. As the polarizer 113, a polarizer that absorbs a vibration component of an electric field in a direction parallel to the reference direction is used. When infrared rays are used as the shutter control signal, the shutter control signal transmitted from the video processing device 100 is output as polarized infrared rays having a vibration component perpendicular to the reference direction.

  Here, in the shutter-type eyeglasses 150, the direction connecting the centers of the left-eye shutter 152L and the right-eye shutter 152R is regarded as the eye width direction. For the polarizer 153, the same polarizer as the polarizer 113 is used. When the eye width direction of the shutter-type spectacles is in a positional relationship parallel to the reference direction, the polarized infrared ray that has passed through the polarizer 113 is most transmitted. Installed in shutter-type glasses. Thus, when the eye width direction of the user wearing the shutter glasses 150 is parallel to the reference direction, that is, the face is not inclined, the signal receiving unit 154 receives a shutter control signal whose signal level is not attenuated by the polarizer 153. It will be. When the eye width direction has an inclination angle with respect to the reference direction and the user's face is inclined, the positional relationship between the polarizer 113 and the polarizer 153 is shifted as shown in FIG. Thereby, the transmission characteristic when the shutter control signal passes through the polarizer 153 changes. As the tilt angle in the eye width direction with respect to the reference direction increases, the transmittance of the shutter control signal decreases. When the tilt angle in the eye width direction with respect to the reference direction is ± 90 degrees, the output of transmitted light becomes zero. Therefore, the signal receiving unit 154 receives the shutter control signal whose signal level is attenuated by passing through the polarizer 153.

  FIG. 4 is a block diagram showing the internal structure of the signal receiving unit 154 that implements the first embodiment. The processing in the signal receiving unit 154 will be described using this.

  The photo sensor unit 401 converts a shutter control signal incident through the polarizer 153 into a current signal using a photodiode. The I / V conversion unit 402 converts the current signal obtained by the photosensor unit 401 into a voltage signal. The signal adjustment unit 403 amplifies the voltage signal obtained by the I / V conversion unit 402 with a predetermined amplification factor.

  The band-pass filter unit 404 filters out an ineffective frequency component outside the effective frequency band from the signal amplified by the signal adjustment unit 403 to remove a noise signal and the like. Infrared signals and other noise signals output from the remote control unit 121 are removed here. The detection unit 405 demodulates the signal filtered by the bandpass filter unit 404. The signal Sig. 1 is sent to the amplitude amplifying unit 406 and the inclination detecting unit 408.

  The amplitude amplifying unit 406 receives the signal Sig. Automatic gain control (AGC) is applied to amplify the amplitude level to a predetermined value so that the amplitude level is suitable when 1 is input to the A / D converter 407 in the subsequent stage. The A / D conversion unit 407 receives the signal Sig. 2 is quantized 1 bit, converted from an analog format to a digital format, and converted into a digital signal Sig. 3 is output. The signal Sig. 1 is a digital signal Sig. 1 generated through the amplitude amplification unit 406 and the A / D conversion unit 407. 3 is a synchronization signal for synchronizing the displayed image and the shutter portion of the shutter-type glasses. Since the amplification factor of the amplitude amplification unit 406 has an upper limit, if the amplitude of the signal output from the detection unit 405 is excessively low, the signal is not effective as a synchronization signal.

  The inclination detection unit 408 receives the signal Sig. 1 is compared with a preset threshold value or a threshold value changed by the control unit 151, and 1-bit quantization is performed. The identification signal Sig. Indicates whether or not this signal enables 3D video viewing. 4.

  The signal Sig. 1 in the period in which the amplitude of 1 does not exceed the threshold value. 4 is a digital value 0. Further, the identification signal Sig. 4 is a digital value of 1. This threshold value is a reference value for detecting that the eye width direction of the shutter-type spectacles is inclined with respect to the reference direction. When viewing 3D video, a threshold is set in advance according to the tilt angle in the eye width direction with respect to the reference direction, which disables 3D video viewing in order to prevent the user's stereotype sickness. For example, when 3D video viewing is invalidated when the tilt angle in the eye width direction with respect to the reference direction is ± 10 degrees or more, the relationship between the polarizer 113 and the polarizer 153 is obtained under a condition where the relation is shifted by ± 10 degrees. The peak value of the amplitude of the demodulated signal is preset as a threshold value. Further, for example, the threshold value may be adjusted by the user operating the operation unit 155.

  The control signal output unit 409 is configured to enable an enable signal Sig. 5 and the synchronization signal Sig. Output from the A / D converter 407. 3 and the enable signal Sig. 5 is output to the control unit 151 as a shutter control signal. Enable signal Sig. 5 is the synchronization signal Sig. 3 and the identification signal Sig. 4 is generated based on the comparison result with 4. Synchronization signal Sig. 3 is a periodic signal that periodically repeats the values of 1 and 0, and the synchronization signal Sig. 3 and the identification signal Sig. 4 is the same, it is determined that 3D video viewing is effective, and the enable signal Sig. 5 is output as a digital value 1 (3D viewing valid). Synchronization signal Sig. 3 is not a periodic signal, or the synchronization signal Sig. 3 is a periodic signal, the synchronization signal Sig. 3 and the identification signal Sig. 4 does not match, the enable signal Sig. 5 is output as a digital value 0 (3D viewing disabled). The control unit 151 includes a synchronization signal Sig. 3 and the enable signal Sig. 5, the left-eye shutter 152L and the right-eye shutter 152R are controlled.

  FIG. 5 illustrates the synchronization signal Sig. Generated by the signal receiving unit 154 according to the tilt angle of the eye width direction with respect to the reference direction with respect to the shutter control signal output from the signal transmitting unit 112. 3, identification signal Sig. 4 and the enable signal Sig. FIG. The threshold used in the inclination detection unit 408 is set in advance to the peak value of the amplitude under the condition that the inclination angle of the eye width direction with respect to the reference direction is shifted by ± 10 degrees, and the eye width direction is ± 10 degrees or more from the reference direction. When is tilted, 3D viewing is disabled.

  In the case of FIG. 5A in which the user's face is not tilted, that is, the tilt angle in the eye width direction is 0 degrees with respect to the reference direction, the signal Sig. 1 is amplified to a predetermined value by the amplitude amplifying unit 406 (Sig. 2). In the inclination detector 408, the amplified signal Sig. 2 has an amplitude greater than or equal to the threshold. Therefore, the signal Sig. 2 is converted into a digital signal, and the synchronization signal Sig. 3 and the identification signal Sig. 4 matches. Synchronization signal Sig. 3 and the identification signal Sig. 4 coincides with the synchronization signal Sig. 3 is a periodic signal that periodically repeats the values of 1 and 0, the enable signal Sig. 5 is a digital value 1 (3D viewing valid). The control signal output unit 409 receives the synchronization signal Sig. 3 and the enable signal Sig. 5 is output. The control unit 151 receives the synchronization signal Sig. Output from the A / D conversion unit 407. 3 is used to control the light-shielding state or the non-light-shielding state of each of the left-eye shutter 152L and the right-eye shutter 152R of the shutter unit 152 so as to allow 3D video viewing.

  In the case of FIG. 5B in which the inclination angle in the eye width direction with respect to the reference direction is 45 degrees, the signal Sig. 1 is amplified to a predetermined value by the amplitude amplifying unit 406 (Sig. 2), and the synchronization signal Sig. 3 is obtained as a periodic signal. However, since the amplitude is smaller than the threshold value used in the inclination detector 408, the identification signal Sig. 4 is not a periodic signal. Therefore, the synchronization signal Sig. 3 is a periodic signal, the synchronization signal Sig. 3 and the identification signal Sig. 4 does not match, the enable signal Sig. 5 is a digital value 0 (3D viewing invalid). Therefore, the control unit 151 causes the synchronization signal Sig. 3 is used to disable 3D video viewing and control the shutter unit 152 so that 2D video viewing is possible.

  In the case of FIG. 5C where the tilt angle in the eye width direction is 90 degrees with respect to the reference direction, the signal Sig. 1 has an amplitude smaller than the amplifiable line in the amplitude amplifying unit 406, so that the synchronization signal Sig. The digital value of 3 is always 0. Further, since the amplitude is smaller than the threshold value used in the inclination detection unit 408, the identification signal Sig. 4 is not a periodic signal. Therefore, the synchronization signal Sig. 3 and the identification signal Sig. 4 match, but the synchronization signal Sig. 3 is not a periodic signal, the enable signal Sig. 5 is a digital value 0 (3D viewing invalid). At this time, the synchronization signal Sig. Since 3 is not a periodic signal, the shutter unit 152 cannot be controlled.

  Next, operations of the control unit 151 and the shutter unit 152 will be described with reference to the flowchart of FIG.

  In step S601, it is identified whether the shutter glasses are activated. If it has not been activated, the process ends. If it has been activated, the process proceeds to step S602. In step S <b> 602, the control signal 151 is received by the control unit 151 from the control signal output unit 409 of the signal reception unit 154. 3 identifies whether it is a periodic signal. If it is a periodic signal, the process proceeds to step S603, and if it is not a periodic signal, the process proceeds to step S606. In step S <b> 603, the control unit 151 determines whether the enable signal Sig. 5 is identified. Enable signal Sig. When the digital value indicated by 5 is 1, the process proceeds to step S604, and when it is 0, the process proceeds to step S605.

  Proceeding to step S604 is a desirable state for viewing 3D video because the eye width direction of the shutter-type glasses is less than ± 10 degrees, for example, relative to the reference direction, and the 3D video viewing posture and usage conditions are appropriate. Indicates that Proceeding to step S605 indicates that the usage condition is appropriate, but the eye width direction is tilted by ± 10 degrees or more with respect to the reference direction, which is an undesirable state for viewing 3D video. Proceeding to step S606 indicates that there is a problem in use conditions or the posture for viewing 3D images, and the eye width direction is ± 45, for example, with respect to the reference direction such that the shutter control signal cannot sufficiently pass through the polarizer 153. This indicates that the angle is excessively large.

  In step S604, as shown in FIG. 7A, the received synchronization signal Sig. 3, the control unit 151 performs shutter control for realizing 3D video viewing on the left-eye shutter 152 </ b> L and the right-eye shutter 152 </ b> R of the shutter unit 152. The left-eye shutter 152L is switched to the non-light-shielding state and the right-eye shutter 152R is switched to the light-shielding state when the left-eye image is displayed, in accordance with the switching timing of the left-eye image and the right-eye image. Further, when the right-eye image is displayed, the left-eye shutter 152L is switched to the light-shielding state, and the right-eye shutter 152R is switched to the non-light-shielding state. As a result, the user can view 3D video.

  In step S605, as shown in FIG. 7B, the received synchronization signal Sig. 3, the control unit 151 performs shutter control for realizing 2D video viewing on the left-eye shutter 152L and the right-eye shutter 152R of the shutter unit 152. For example, the left-eye shutter 152L and the right-eye shutter 152R are shielded when either the left-eye image or the right-eye image is displayed, and the left-eye shutter 152L and the right-eye shutter are displayed when the other image is displayed. The 152R is brought into a non-light-shielding state. As a result, the user can view 2D video.

  In step S606, as illustrated in FIG. 7C, the control unit 151 performs control so that the left-eye shutter 152L and the right-eye shutter 152R of the shutter unit 152 are always in a non-light-shielding state. As a result, the user sees a 2D image of a double image composed of the image for the left eye and the image for the right eye. The enable signal Sig. If the digital value of 5 remains 0 (step S607, Yes), the shutter glasses are turned off (step S608).

  According to the above configuration, it is possible to detect the inclination of the user's eye width direction without significantly increasing the power consumption of the shutter-type spectacles, and to suppress the three-dimensional sickness caused by the user's viewing posture. In addition, when the eye width direction has an inclination angle with respect to the reference direction, it is possible to view 2D video without a double image, and to disable 3D video viewing. Further, since it is not necessary to mount a sensor for detecting tilt on the shutter-type spectacles, it is possible to reduce the size and weight.

(Example 2)
Embodiment 2 of the present invention will be described below. FIG. 8 is a block diagram of a video viewing system that implements the second embodiment. The second embodiment is different from the first embodiment in three configurations described below. First, as shown in FIG. 8, a signal transmission unit A 801 and a signal transmission unit B 802 for transmitting a signal from the video processing apparatus 100 to the shutter-type glasses 150 are provided. Second, the relationship between the polarizer 113 and the polarizer 153 differs from that of the first embodiment in that the signal A is transmitted most when the eye width direction of the shutter-type spectacles is perpendicular to the reference direction, and the reference When the eye width direction of the shutter glasses is parallel to the direction, the signal A is blocked. Third, the configuration of the internal block of the signal receiving unit 154 is changed to the block configuration shown in FIG. In the second embodiment, the influence of spatial propagation attenuation is reduced by adding a signal transmission unit B802 that transmits a signal without passing through the polarizer 113, and shutter control is performed according to the tilt angle in the eye width direction with respect to the reference direction. It is characterized by switching.

  The video processing apparatus 100 transmits the signal A from the signal transmission unit A801 as a signal for detecting the tilt angle of the eyeglass direction of the shutter glasses 150 with respect to the reference direction. Further, a signal B is transmitted from the signal transmission unit B 802 as a signal for synchronizing the display unit with the shutter unit 152 of the shutter-type glasses 150. At this time, the signal A and the signal B are omnidirectional light, and the signal B is a signal obtained by inverting the amplitude direction of the signal A. The signal A is received by the signal receiving unit 154 via the polarizer 113 and the polarizer 153. The signal B transmitted from the signal transmission unit B 802 is received by the signal reception unit 154 via the polarizer 153 without passing through the polarizer 113.

  The signal A and the signal B from the video processing apparatus 100 are received by the signal receiving unit 154 as a composite wave. When the eye width direction of the shutter-type spectacles 150 is parallel to the reference direction, the polarizer 153 blocks the signal A component. Therefore, the signal received by the signal receiver 154 is only the component of the signal B transmitted from the signal transmitter B802. The transmittance of the signal A transmitted through the polarizer 153 changes according to the tilt angle in the eye width direction with respect to the reference direction, and the transmittance of the component of the signal A is maximum when the tilt angle in the eye width direction is ± 90 degrees. Become. The reception level of the signal A received by the signal receiving unit 154 changes in accordance with the change in transmittance.

  The internal structure of the signal receiving unit 154 that implements the second embodiment will be described with reference to FIG. Unlike the first embodiment, the signal reception unit 154 includes an amplification factor control unit 901 and a synchronization signal detection unit 902. The amplification factor control unit 901 always monitors the signal from the detection unit 405 and performs control to amplify the signal input to the synchronization signal detection unit 902 and the inclination detection unit 408. At this time, automatic gain control (AGC) is signaled so that the maximum value of the signal level in the signal from the detection unit 405 is amplified to the maximum value of the dynamic range that can be handled by the synchronization signal detection unit 902 and the inclination detection unit 408. This is performed on the adjustment unit 403. By performing amplification based on the maximum value of the signal level in the signal from the detection unit 405, it is possible to reduce the influence of spatial propagation attenuation in the signals transmitted from the signal transmission unit A801 and the signal transmission unit B802. Therefore, the detection accuracy of the synchronization signal and the inclination in the synchronization signal detection unit 902 and the inclination detection unit 408 can be improved.

  Note that there is an upper limit for the amplification factor in the signal adjustment unit 403. Therefore, when both the signal A and the signal B are attenuated due to the influence of spatial propagation, the signal level in the signal from the detection unit 405 may not reach the threshold used by the synchronization signal detection unit 902 and the inclination detection unit 408. This means that the relationship between the video processing device 100 and the shutter glasses 150 does not satisfy the signal reception condition.

  The synchronization signal detection unit 902 compares the signal output from the detection unit 405 with a threshold A, quantizes 1 bit based on the comparison result, and outputs the result as a digital signal. This signal is a synchronization signal Sig. For controlling the light shielding state or non-light shielding state of the left eye shutter 152L and the right eye shutter 152R of the shutter unit 152 in synchronization with the display image. 7 The inclination detection unit 408 compares the signal output from the detection unit 405 with the threshold value B, quantizes 1 bit based on the comparison result, and outputs the result as a digital signal. This signal is an identification signal Sig. 8. The threshold A and threshold B will be described later.

  Similar to the first embodiment, the control signal output unit 409 is configured to enable the enable signal Sig. 9 is generated. Enable signal Sig. 9 is the synchronization signal Sig. 7 and the identification signal Sig. 8 is generated based on the comparison result with 8.

  10 and 11 show the synchronization signal Sig. Generated by the signal receiving unit 154 according to the inclination angle of the eye width direction with respect to the reference direction with respect to the signal A and the signal B transmitted from the video processing device 100. 7. Identification signal Sig. 8 and the enable signal Sig. FIG.

  When the tilt angle of the eyeglass width direction of the shutter glasses with respect to the reference direction is 0 degree, the transmittance of the signal A with respect to the polarizer 153 is zero as shown in FIG. After that, the signal a is cut off. On the other hand, since the signal B is omnidirectional light, the signal B becomes like the signal b after passing through the polarizer 153. The signal receiving unit 154 receives a composite wave of the signal a and the signal b. The received synthesized wave is only the component of the signal B, passes through the signal adjustment unit 403 and the band pass filter unit 404, and the signal Sig. 6 is shown in FIG.

  The signal Sig. 6 is compared with the threshold A by the synchronization signal detection unit 902, and is compared with the threshold B by the inclination detection unit 408. The threshold A is a synchronization signal Sig. For synchronizing the displayed image with the shutter portion of the shutter-type glasses. 7 is a threshold value predetermined by the control unit 151 to generate 7. The threshold value B is an identification signal Sig. Indicating whether or not the tilt angle in the eye width direction with respect to the reference direction is detected and 3D video viewing is enabled. The threshold value is predetermined by the control unit 151 to generate 8. When the displayed video and the shutter part of the shutter-type glasses cannot be synchronized, it is difficult to view 2D video or 3D video without a double image. Therefore, the threshold A is set to the synchronization signal Sig. In order to obtain a periodic signal as 7, it is desirable to set it relatively high. The threshold value B is a reference value for detecting that the eye width direction of the shutter-type spectacles is tilted with respect to the reference direction, like the threshold value in the first embodiment. For example, when 3D video viewing is invalidated when the tilt angle in the eye width direction with respect to the reference direction is ± 10 degrees or more, the relationship between the polarizer 113 and the polarizer 153 is obtained under a condition where the relation is shifted by ± 10 degrees. The peak value of the amplitude of the demodulated signal can be preset as the threshold value B.

  In FIG. 10A, the signal Sig. 6 is lower than the threshold value A, the A / D converted Sig. 7 is a periodic signal that periodically repeats the values of 1 and 0. Similarly, since the threshold value B is also lower, the A / D-converted Sig. 8 is also a periodic signal. Similar to the first embodiment, the synchronization signal Sig. 7 and the identification signal Sig. 8 coincides with the synchronization signal Sig. 7 and the identification signal Sig. 8 is a periodic signal, the enable signal Sig. 9 is a digital value 1 (3D viewing valid). Therefore, the control unit 151 causes the synchronization signal Sig. 7 is used to control the light-shielding state or the non-light-shielding state of each of the left-eye shutter 152L and the right-eye shutter 152R of the shutter unit 152 so that a 3D image can be viewed.

  When the inclination angle in the eye width direction with respect to the reference direction is 45 degrees, as shown in FIG. 10B, the signal a of the reception component of the signal A has a larger amplitude than the signal a when the inclination angle is 0 degree. Become. When the tilt angle in the eye width direction with respect to the reference direction increases, the amplitude of the signal a as the reception component of the signal A increases, and the upper limit level of the signal increases. At this time, the signal Sig. 6, the lower limit level becomes higher than in the case of FIG. Signal Sig. 6 is below the threshold A but above the threshold B, the synchronization signal Sig. 7 is obtained as a periodic signal, but the identification signal Sig. 8 is not a periodic signal. Therefore, the synchronization signal Sig. 7 is a periodic signal, but the synchronization signal Sig. 7 and the identification signal Sig. 8 does not match, the enable signal Sig. 9 is a digital value 0 (3D viewing invalid). Therefore, the control unit 151 causes the synchronization signal Sig. 7, the 3D video viewing is invalidated and the shutter unit 152 is controlled so that the 2D video viewing is possible. For example, the left-eye shutter 152L and the right-eye shutter 152R are shielded when either the left-eye image or the right-eye image is displayed, and the left-eye shutter 152L and the right-eye shutter are displayed when the other image is displayed. The 152R is brought into a non-light-shielding state.

  When the tilt angle in the eye width direction with respect to the reference direction is 90 degrees and the amplitude of the signal a is maximized, the result is as shown in FIG. Signal Sig. 6 exceeds the threshold A and the threshold B, and therefore the synchronization signal Sig. 7 and the identification signal Sig. 8 is not a periodic signal but always has a digital value of 1. Synchronization signal Sig. 7 and the identification signal Sig. 8 coincides with the synchronization signal Sig. 7 is not a periodic signal, the enable signal Sig. The digital value 0 (3D viewing invalid) is output as 9.

  Further, the signal Sig. 6 is below the threshold A and threshold B, the synchronization signal Sig. 7 and the identification signal Sig. It is not a periodic signal of 8, but always has a digital value of 0. At this time, the synchronization signal Sig. 7 and the identification signal Sig. 8 coincides with the synchronization signal Sig. 7 is not a periodic signal, the enable signal Sig. The digital value 0 (3D viewing invalid) is output as 9. FIG. 11B shows a signal when the amount of spatial propagation attenuation is large when the tilt angle in the eye width direction is 90 degrees with respect to the reference direction. Since the amplitude of the signal a is less than or equal to the amplitude of the signal b, no matter what the angle of inclination in the eye width direction with respect to the reference direction is, the signal Sig. 6 signal level is below threshold A and threshold B. Therefore, the enable signal Sig. The digital value 0 (3D viewing invalid) is output as 9.

  In the cases of FIGS. 11A and 11B, the synchronization signal Sig. Since 7 is not a periodic signal, it is impossible to synchronize the displayed image with the shutter unit 152 of the shutter-type glasses. At this time, the left-eye shutter 152L and the right-eye shutter 152R of the shutter unit 152 are opened, and a double image including the left-eye image and the right-eye image is displayed. The enable signal Sig. If 9 remains 0, the shutter glasses may be turned off.

  The operations of the control unit 151 and the shutter unit 152 in the second embodiment are performed as shown in FIG.

  According to the above configuration, it is possible to detect the inclination of the user's eye width direction without significantly increasing the power consumption of the shutter-type spectacles, and to suppress the three-dimensional sickness caused by the user's viewing posture. In addition, when the eye width direction has an inclination angle with respect to the reference direction, it is possible to view 2D video without a double image, and to disable 3D video viewing. Further, it is possible to reduce the influence of spatial propagation attenuation that is received before the signal transmitted from the signal transmission unit is received by the signal reception unit, and appropriately detects the tilt of the shutter-type spectacles and the image and the shutter unit of the shutter-type spectacles. Can be synchronized.

DESCRIPTION OF SYMBOLS 100 Image processing apparatus 112 Signal transmission part 113 Polarizer 150 Shutter-type spectacles 151 Control part 153 Polarizer 154 Signal reception part 408 Inclination detection part 901 Amplification rate control part 902 Synchronization signal detection part

Claims (6)

The shutter glasses for controlling the left eye shutter and the right eye shutter according to the switching timing of the left eye image and the right eye image displayed in a stereoscopically viewable manner on the display unit, and the shutter glasses In a video viewing system including a transmission device that transmits a shutter control signal for controlling a shutter,
The transmitter is
Transmitting means for transmitting the shutter control signal;
First polarization means for performing polarization processing on the shutter control signal transmitted by the transmission means;
The shutter glasses are
The shutter control signal that has been subjected to polarization processing by the first polarization means is subjected to polarization processing so that it is transmitted at a higher transmittance as the eye width direction of the shutter-type spectacles is closer to a predetermined reference direction. Two polarizing means;
Receiving means for receiving the shutter control signal transmitted by the transmitting means in the transmitting device via the first polarizing means and the second polarizing means;
Detecting means for detecting an inclination of the shutter-type glasses based on an amplitude level of the shutter control signal received by the receiving means;
The left eye image and the right eye image displayed on the display unit are stereoscopically viewed when the detection unit detects that the inclination of the shutter glasses is less than a predetermined threshold. The left-eye image and the right-eye image displayed on the display unit when the eye shutter and the right-eye shutter are controlled and the detection unit detects that the inclination of the shutter-type eyeglasses is equal to or greater than a predetermined threshold. Control means for controlling the left eye shutter and the right eye shutter so that the eye image is not stereoscopically viewed;
A video viewing system comprising:   The control means sets the left-eye shutter to a non-light-shielding state when displaying the left-eye image when the detection means detects that the tilt of the shutter-type glasses is less than a predetermined threshold value, and The left-eye shutter and the right-eye shutter are set such that the right-eye shutter is shielded, the right-eye shutter is not shielded when the right-eye image is displayed, and the left-eye shutter is switched to the shielded state. And when the detection means detects that the inclination of the shutter-type glasses is equal to or greater than a predetermined threshold, the left eye image or the right eye image is displayed when the left eye image is displayed. The left-eye shutter and the right-eye shutter are set in a light-shielded state, and the left-eye shutter and the right-eye shutter are in a non-light-shielded state when the other image is displayed. Video viewing system according to claim 1, characterized in that controlling the Yatta. Amplifying means for amplifying the amplitude level of the shutter control signal received by the receiving means to a predetermined level;
Conversion means for converting the shutter control signal whose amplitude is amplified by the amplification means from an analog format to a digital format;
3. The control unit according to claim 1, wherein the control unit controls the left-eye shutter and the right-eye shutter using a shutter control signal converted into a digital format by the conversion unit. Video viewing system. The shutter glasses for controlling the left eye shutter and the right eye shutter according to the switching timing of the left eye image and the right eye image displayed in a stereoscopically viewable manner on the display unit, and the shutter glasses In a video viewing system including a transmission device that transmits a shutter control signal for controlling a shutter,
The transmitter is
First transmission means for transmitting a shutter control signal;
First polarization means for applying polarization processing to the shutter control signal transmitted by the first transmission means;
Second transmission means for transmitting a shutter control signal which is a signal obtained by inverting the amplitude direction of the shutter control signal transmitted by the first transmission means;
The shutter glasses are
The shutter control signal subjected to polarization processing by the first polarization means is subjected to polarization processing so that the shutter-type spectacles are transmitted with higher transmittance as the eye width direction of the shutter-type spectacles is closer to a predetermined reference direction. Two polarizing means;
The shutter control signal transmitted from the first transmission means via the first polarization means in the transmission device, and the shutter control signal transmitted from the second transmission means without passing through the first polarization means, Receiving means for receiving the synthesized signal via the second polarizing means;
Detecting means for detecting the tilt of the shutter-type glasses based on the signal level of the signal received by the receiving means;
The left eye image and the right eye image displayed on the display unit are stereoscopically viewed when the detection unit detects that the inclination of the shutter glasses is less than a predetermined threshold. The left-eye image and the right-eye image displayed on the display unit when the eye shutter and the right-eye shutter are controlled and the detection unit detects that the inclination of the shutter-type eyeglasses is equal to or greater than a predetermined threshold. Control means for controlling the left eye shutter and the right eye shutter so that the eye image is not stereoscopically viewed;
A video viewing system comprising: The shutter glasses for controlling the left eye shutter and the right eye shutter according to the switching timing of the left eye image and the right eye image displayed in a stereoscopically viewable manner on the display unit, and the shutter glasses In a method for controlling shutter-type glasses in a video viewing system including a transmission device that transmits a shutter control signal for controlling a shutter,
A transmission step of transmitting a shutter control signal from the transmission device;
A first polarization step for performing polarization processing on the shutter control signal transmitted in the transmission step;
Secondly, the shutter control signal that has been subjected to the polarization processing in the first polarization step is subjected to polarization processing so that the shutter-type spectacles are transmitted at a transmittance as the eye width direction of the shutter glasses is closer to a predetermined reference direction. A polarization process;
A reception step in which the shutter glasses receive the shutter control signal transmitted in the transmission step through the first polarization step and the second polarization step;
A detecting step of detecting an inclination of the shutter-type glasses based on an amplitude level of the shutter control signal received by the receiving step;
The left eye image and the right eye image displayed on the display unit are stereoscopically viewed when the detection step detects that the tilt of the shutter glasses is less than a predetermined threshold. When the eye shutter and the right eye shutter are controlled, and the detection step detects that the inclination of the shutter-type spectacles is equal to or greater than a predetermined threshold, the left eye image and the right eye displayed on the display unit A control step of controlling the left eye shutter and the right eye shutter so that the eye image is not stereoscopically viewed;
A method for controlling shutter-type eyeglasses, comprising: The shutter glasses for controlling the left eye shutter and the right eye shutter according to the switching timing of the left eye image and the right eye image displayed in a stereoscopically viewable manner on the display unit, and the shutter glasses In a method for controlling shutter-type glasses in a video viewing system including a transmission device that transmits a shutter control signal for controlling a shutter,
A first transmission step of transmitting a shutter control signal from the transmission device;
A first polarization step for performing polarization processing on the shutter control signal transmitted in the transmission step;
A second transmission step of transmitting a shutter control signal, which is a signal obtained by inverting the amplitude direction of the shutter control signal transmitted by the first transmission unit, from the transmission device;
A second polarization process is performed so that the shutter control signal subjected to the polarization process in the first polarization process is transmitted at a transmittance as the eye width direction of the shutter-type glasses is closer to a predetermined reference direction. A polarization process;
The shutter control signal transmitted from the first transmission step via the first polarization step and the shutter control signal transmitted from the second transmission step without passing through the first polarization step. A reception step of receiving a signal combined with the signal through the second polarization step;
A detecting step of detecting an inclination of the shutter-type glasses based on an amplitude level of the shutter control signal received by the receiving step;
The left eye image and the right eye image displayed on the display unit are stereoscopically viewed when the detection step detects that the tilt of the shutter glasses is less than a predetermined threshold. When the eye shutter and the right eye shutter are controlled, and the detection step detects that the inclination of the shutter-type spectacles is equal to or greater than a predetermined threshold, the left eye image and the right eye displayed on the display unit A control step of controlling the left eye shutter and the right eye shutter so that the eye image is not stereoscopically viewed;
A method for controlling shutter-type eyeglasses, comprising:

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