JP2006113088A - Crosstalk cancellation polarization 3D system - Google Patents

Abstract

The present invention provides a means for quickly eliminating crosstalk, which is a problem in a so-called polarized glasses type 3D image observation method using polarized glasses.
According to the stereoscopic image system of the present invention, a difference value indicating how much the value changes when the polarization direction of the lens of the polarized glasses changes due to the movement of the observer observing the 3D image. It has a detection unit that detects based on an electrical signal, and rotates the lens of the polarizing glasses until the difference value detected by the detection unit becomes zero, or the light of the left eye image and the right eye image projected from the projection device. By changing the polarization direction, crosstalk can be quickly eliminated.
[Selection] Figure 1

Description

  The present invention is a 3D system in which an observer observes 3D images using polarized glasses, and when an observer wearing polarized glasses tilts his / her face, the polarization direction of the lenses of the polarized glasses and the projection device The present invention relates to a crosstalk eliminating polarization 3D system for quickly eliminating so-called crosstalk, which occurs when the polarization directions of a left-eye image and a right-eye image to be projected are shifted.

  As one of the general methods for observing 3D images with a sense of popping, the viewer can observe the 3D images projected by a projector such as a projector while wearing polarized glasses. A so-called polarizing glasses system that can be observed is known. In this method, the right-eye image and the left-eye image are projected by polarized light orthogonal to each other by some method, the right lens of the polarizing glasses has the same polarization direction as the light of the right-eye image, and the left lens is the light of the left-eye image. Or a polarizing film having the same polarization direction as the lens. This allows the right lens of the polarizing glasses to transmit only the right eye image light and the left lens to transmit only the left eye image light, so that the right eye image for the observer's right eye and the left eye image for the left eye Comes in. With such a mechanism, an observer can observe a 3D image three-dimensionally by viewing different images with the left and right eyes.

  By the way, when the observer observes a 3D image by this polarized glasses method, for example, when the body is laid down, the polarization direction of the left and right lenses of the polarized glasses worn by the observer and the polarized 3D Since the polarization direction of the image light does not match, so-called crosstalk occurs in which the light of the right-eye image enters the left eye of the observer or the left-eye image enters the right eye. Therefore, it is necessary for the observer not to move his / her head while observing the 3D image with the polarizing glasses.

Japanese Patent Application Laid-Open No. H10-228667 discloses a solution to such a crosstalk problem. In Patent Document 1, by fixing the weight under the polarizing lens so that the polarizing lens of the polarizing glasses can freely rotate, the polarizing lens rotates according to the inclination of the observer's head, and the polarization direction of the polarizing lens is changed. It is to be corrected.
Japanese Patent Laid-Open No. 7-230060

  However, when such a weight is used, there is a problem that a large time lag occurs between the tilt of the polarized glasses and the return of the lens to the correct position by the weight. While this time lag occurs, it is inevitable that crosstalk occurs as in the prior art.

  In the present invention, in order to solve this problem, a stereoscopic video system using polarized glasses having a detection unit that detects a difference value between a polarization direction of a polarizing lens and a polarization direction of light of a 3D image by an electrical signal is provided. suggest.

  FIG. 1 shows an embodiment of the present invention. The stereoscopic video system of the present invention is composed of a projection device that projects left-eye video and right-eye video with light of different polarization directions, and polarized glasses for viewing the video projected from the projection device. The projection device holds a left-eye project lens for projecting a left-eye image and a right-eye project lens for projecting a right-eye image. Polarized glasses hold a left eyeglass lens and a right eyeglass lens, and these two lenses are polarized lenses by using a polarizing film or the like. Although not shown, the polarizing glasses of the stereoscopic image system of the present invention have a detection unit for detecting its own inclination inside or outside, or inside and outside. Here, the “tilt” is a tilt indicating how much the polarized glasses are rotated counterclockwise or clockwise on a plane parallel to the screen.

  As described above, according to the stereoscopic image system of the present invention, the difference indicating how much the value changes when the polarization direction of the lens of the polarizing glasses changes due to the movement of the observer who observes the 3D image. Crosstalk, which is a problem in 3D video observation methods using polarized glasses, by rotating the polarization glasses lens or the project lens of the projection device until the detected difference value becomes zero by detecting the value with an electrical signal. Can be quickly resolved.

  Hereinafter, embodiments of the present invention will be described. Note that the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the spirit of the present invention.

  In addition, the relationship between the following embodiment and a claim is as follows.

  The first embodiment will mainly describe claims 1 and 4.

  The second embodiment will mainly describe claim 2 and the like.

The third embodiment will mainly describe claim 3 and the like.
(Embodiment 1)

  (Embodiment 1: Overview)

  This embodiment is composed of a projection device that projects a left-eye image and a right-eye image with light of different polarization directions, and polarizing glasses for viewing the image projected from the projection device. For example, the present invention relates to a stereoscopic video system having a function of detecting a difference value when the polarizing glasses are tilted by moving the lens and the polarization direction of the polarizing lens is changed.

  (Embodiment 1: Configuration)

  FIG. 2 illustrates functional blocks of the stereoscopic video system according to the present embodiment.

  The stereoscopic video system includes a projection device (0210) and polarized glasses (0220).

  The projection device (0210) projects the left-eye video and the right-eye video in different polarization directions in order to recognize different videos between the left and right eyes. The “different polarization directions” are usually directions orthogonal to each other. The projection device (0210) includes a left-eye image polarizing unit (0211) and a right-eye image polarizing unit (0212).

  The left-eye video polarization unit (0211) has a function of projecting the left-eye video on the screen in the first polarization direction. There are various methods for polarizing the left-eye image light in the first polarization direction. For example, the left-eye project lens for projecting the left-eye image of the projection device (0210) has the same polarization as the first polarization direction. The light of the left eye image may be polarized and projected by attaching a polarization filter that is the direction, or after the light of the left eye image is polarized by a polarizing beam splitter or the like inside the projection device (0210). You may project with a project lens.

  The right-eye image polarizing unit (0212) has a function of projecting the right-eye image onto the screen in the second polarization direction. Various methods are conceivable for polarizing the right-eye image light in the second polarization direction in the same manner as the polarization method in the left-eye image polarization unit (0211).

  Here, normally, the “first polarization direction” and the “second polarization direction” are directions orthogonal to each other.

  FIG. 3 illustrates a specific example of “first polarization direction” and “second polarization direction”. When the horizontal direction is 0 °, in the case of the polarized glasses of (A), the first polarization direction is 0 ° and the second polarization direction is 90 °. In the case of the polarized glasses of (B), the first polarization direction and the second polarization direction are perpendicular to each other and are V-shaped inclined by 45 ° from (A). The polarized glasses of (C) have a C shape with the polarization direction reversed. As the polarization direction of the polarizing lens, cases (A) to (C) are common.

  Even if the left-eye image polarizing unit (0211) and the right-eye image polarizing unit (0212) are not configured as an integral projection device, two devices having the respective polarizing units are integrated into a single unit. It may be configured as a projection device.

  The polarized glasses (0220) include a left-eye spectacle lens unit (0221), a right-eye spectacle lens unit (0222), and a detection unit (0223).

  The left eyeglass lens unit (0221) has a function of transmitting light in the first polarization direction and recognizing the left eye of the observer. In order to transmit only light polarized in the first polarization direction, a left-eye spectacle lens unit can be realized by using a polarizing filter or the like having the same polarization direction as the first polarization direction as a lens.

  The right eyeglass lens unit (0222) has a function of transmitting light in the second polarization direction and recognizing it to the right eye of the observer. In order to transmit only the light polarized in the second polarization direction, a right-eye spectacle lens unit can be realized by using a polarizing filter or the like having the same polarization direction as the second polarization direction as a lens.

  The detection unit (0223) includes the first polarization direction and / or the second polarization direction, and the polarization that allows the left-eye spectacle lens unit (0221) or / and the right-eye spectacle lens unit (0222) to transmit light. It has a function of detecting a difference value from the direction. Various specific detection methods can be considered, and an example is shown in FIGS.

  FIG. 4 shows one specific example of the detection method in the detection unit (0223). A small detection lens (0410) for detecting the tilt angle of the polarized glasses is provided at the end of the polarized glasses (0400), and the detection lens (0410) is also a polarized lens. The “inclination angle” is an inclination angle of the polarization direction of the right eyeglass lens or the left eyeglass lens of the polarized glasses with respect to the polarization direction of the light of the right eye image or the left eye image projected from the projection apparatus. When there is no inclination of the polarized glasses or when the difference value is zero, the polarization direction of the detection lens (0410) is set to the same polarization direction as that of the left-eye glasses lens (0420) or the right-eye glasses lens (0430). . The detection lens (0410) is a rotatable lens, and includes a rotation mechanism for rotating the detection lens (0410) inside or outside, and a light amount measurement mechanism for measuring the amount of light transmitted through the lens. have. When the light amount measured by the light amount measurement mechanism is extremely small, the detection lens (0410) is rotated by the rotation mechanism.

  FIG. 5 illustrates a graph representing the relationship between the rotation angle and the light amount when the detection lens is rotated by the rotation mechanism. The polarization direction of the detection lens is the same as the polarization direction of the right eyeglass lens or the left eyeglass lens as described above. Therefore, when there is no tilt of the polarization glasses, the light of the right eye image or the left eye image is emitted. Since the light is transmitted, the amount of light is the largest and the detection lens does not rotate. The graph representing the relationship between the rotation angle and the light quantity is a graph as shown in (A). For example, when the polarized glasses are tilted by 30 °, the amount of light transmitted through the detection lens is extremely reduced, so that the detection lens is rotated by the rotation mechanism. When the light quantity is measured by the light quantity measurement mechanism while rotating the detection lens, the light quantity increases rapidly when the rotation angle reaches 30 ° (in the case of (B)). Here, since the polarization directions of the light of the detection lens and the right-eye image or the left-eye image coincide with each other, the rotation mechanism stops. Through the above process, an angle of 30 ° can be detected. When the polarizing glasses have such a detection lens separately, the tilt angle of the polarizing glasses can be detected. By the way, since the polarization directions of the light of the right-eye image and the left-eye image are shifted by 90 °, the amount of light becomes maximum at the rotation angle of “difference value −90 °” when the polarizing glasses are inclined by 90 ° or more. End up. For example, if the polarization direction of the detection lens is set to the same polarization direction as that of the left eyeglass lens in a state where the polarization glasses are not tilted, if the polarization glasses are tilted by 120 °, the detection lens is rotated by 30 °. By the way, since the polarization direction of the detection lens is the same polarization direction as the light of the right-eye image, the light amount is also maximized. In actual 3D image observation, such a situation does not occur unless the face of the observer is tilted by 90 ° or more, so it is considered that the situation is very unlikely. However, if such a situation is assumed, for example, left eye video and right eye video are marked differently, and the mark is also detected at the same time by the detection lens. The video for use may be distinguished. The marking cannot be seen with the human eye using, for example, a digital watermark, but if the detection lens can be detected, it will not interfere with the viewing of the video.

  (Embodiment 1: Flow of processing)

  FIG. 6 exemplifies a flowchart for explaining the flow of processing in the stereoscopic video system according to the present embodiment.

  First, the difference value is detected by constantly monitoring whether the difference value has occurred. This process is performed by the detection unit (difference value detection step S0610).

  Next, it is determined whether the observer has finished observing the 3D video. If not completed, the process returns to the difference value detection step (S0610). There are various methods for determining whether or not it has ended. For example, it may be determined that the observer has ended by removing the polarized glasses, or it may be determined by having turned off the power of the projection apparatus. (End determination step S0620).

  (Embodiment 1: Effect)

According to the stereoscopic image system of the present embodiment, when the polarizing glasses are tilted by moving the body while observing the 3D image while wearing the polarizing glasses, the polarization direction of the light of the 3D images and the polarization glasses The difference value of the polarization direction of the polarizing lens can be detected.
(Embodiment 2)

  (Embodiment 2: Overview)

  In the present embodiment, in addition to the function of the stereoscopic video system of the first embodiment, the polarized glasses further include each of the left eyeglass lens unit and / or the right eyeglass lens unit according to the detection result of the detection unit. The present invention relates to a stereoscopic video system having a function of rotating a lens so that the difference value approaches zero.

  (Embodiment 2: Configuration)

  FIG. 7 illustrates functional blocks of the stereoscopic video system according to the present embodiment.

  The stereoscopic video system includes a projection device (0710) and polarized glasses (0720).

  The projection device (0710) includes a left-eye image polarizing unit (0711) and a right-eye image polarizing unit (0712). The polarized glasses (0720) includes a left-eye glasses lens unit (0721), a right-eye glasses lens unit (0722), a detection unit (0723), and a polarized glasses rotation unit (0724). Here, since the configuration other than the polarizing glasses rotating unit (0724) is the same as the configuration of the stereoscopic video system according to the first embodiment, the description thereof is omitted here.

  The polarized glasses rotating unit (0724) is configured to detect each lens of the left-eye glasses lens unit (0721) and / or the right-eye glasses lens unit (0722) in accordance with a difference value that is a detection result of the detection unit (0723). , So that the difference value approaches zero. Therefore, the polarized glasses of the stereoscopic video system according to the present embodiment are based on the premise that the left eyeglass lens unit (0721) and the right eyeglass lens unit (0722) are rotatably held.

  FIG. 8 illustrates the operation of each lens of the polarized glasses. The polarized glasses are viewed from the outside. (A) is a state of polarized glasses when the observer is observing a 3D image without causing crosstalk, and it is assumed that the polarized glasses are horizontal. Here, the polarization direction of each of the left and right lenses of the polarized glasses is a square shape inclined by 45 °. For example, if the observer tilts his / her face by 45 °, the polarized glasses also tilt by 45 ° with respect to the horizontal angle as shown in (B). At this time, the polarization directions of the left-eye spectacle lens (0810) and the right-eye spectacle lens (0820) are also shifted by 45 °. When the polarized glasses are in such a state, the detection unit (0723) detects a difference value of 45 °, and based on the detected difference value, the polarized glasses rotating unit (0724) detects the left-eye glasses lens (0810). And the right-eye spectacle lens (0820) are rotated by 45 ° in the direction opposite to the tilt, and the polarization direction of each lens becomes the same direction as (A) ((C)).

  FIG. 9 shows one example of mounting of the polarizing glasses rotating unit (0724). The left figure is a sectional view of the lens of the polarized glasses and its peripheral frame, and the right figure is an enlarged view of the part where the lens and the frame are in contact. The frame is made of a piezoelectric element (0910), and a protective member (0920) is attached around the lens (0930). The protection member (0920) is for protecting the lens (0930) from directly touching the piezoelectric element (0910), and thus may be a material such as ceramics. Since the piezoelectric element (0910) is generally used as an actuator, a detailed description thereof will be omitted, but it is an element that slightly expands and contracts when a voltage is applied. In addition, the piezoelectric element (0910) is provided at a constant interval between the lens (0930) and the frame. When voltage is applied to these piezoelectric elements (0910) in order, the piezoelectric element (0910) expands and contracts. Thus, the lens (0930) moves and rotates.

  (Embodiment 2: Processing flow)

  FIG. 10 exemplifies a flowchart explaining the flow of processing in the stereoscopic video system according to this embodiment. A difference value detection step (S1010) and an end determination step (S1030), which will be described later, are the same as S0610 and S0620 in the flowchart illustrated in FIG.

  First, the difference value is detected by constantly monitoring whether or not the difference value has occurred (difference value detection step S1010).

  Next, depending on the difference value detected in the difference value detection step (S1010), the left eyeglass lens part and / or the right eyeglass lens part of the polarized glasses are rotated so that the difference value approaches zero. Let This process is performed by the polarizing glasses rotating unit (polarized glasses rotating step S1020).

  Finally, it is determined whether the observer has finished observing the 3D image. (End determination step S1030).

  (Embodiment 2: Effect)

According to the stereoscopic image system of this embodiment, when the polarizing glasses are tilted by moving the body while observing a 3D image while wearing the polarizing glasses, the left eyeglass lens or / and the right eye of the polarizing glasses is used. By rotating the eyeglass lens, the polarization direction of the 3D image projected from the projection device can be matched with the polarization direction of each lens of the polarized glasses, so that crosstalk can be eliminated.
(Embodiment 3)

  (Embodiment 3: Overview)

  In addition to the function of the stereoscopic video system of the first embodiment, the present embodiment further includes a projection device that uses the left-eye video polarization unit and / or the right-eye video polarization unit according to the detection result of the detection unit. The present invention relates to a stereoscopic video system having a function of changing the polarization direction of light of a left-eye video and a right-eye video so that the difference value approaches zero.

  (Embodiment 3: Configuration)

  FIG. 11 illustrates functional blocks of the stereoscopic video system according to the present embodiment.

  The stereoscopic video system includes a projection device (1110) and polarized glasses (1120).

  The projection device (1110) includes a left-eye image polarization unit (1111), a right-eye image polarization unit (1112), and a projection device change unit (1113). The polarized glasses (1120) include a left-eye spectacle lens unit (1121), a right-eye spectacle lens unit (1122), and a detection unit (1123). Here, since the configuration other than the projection device changing unit (1113) is the same as the configuration of the stereoscopic video system according to the first embodiment, the description thereof is omitted here.

  The projection device changing unit (1113) is configured to change the left-eye image polarizing unit (1111) and / or the right-eye image polarizing unit (1112) according to a difference value that is a detection result of the detecting unit (1123). It has a function of changing the polarization direction of the light of the left-eye video and the right-eye video so that the difference value approaches zero. The method for changing the polarization direction of the light for the left-eye image and the right-eye image depends on the polarization method in the left-eye image polarization unit (1111) and the right-eye image polarization unit (1112). If a polarizing film or the like is affixed to a lens or the like and the left eye image and right eye image are polarized and projected, even if each project lens or the like is rotated as in the polarizing glasses rotating unit of the second embodiment, If the light of the left-eye image and the right-eye image is polarized by the polarization beam splitter or the like inside the projection apparatus (1110), the left-eye image and the right-eye image are rotated by rotating the polarization beam splitter or the like. The polarization direction of the light may be changed. The projection device changing unit (1113) and the detection unit (1123) have communication means, but the communication may be wired or wireless. If wireless, invisible light such as Bluetooth (registered trademark) or infrared light may be used, or visible light may be used.

  FIG. 12 exemplifies the operation of each project lens of the projection apparatus according to the tilt of the polarized glasses when the left and right eye images are projected with the project lens being polarized. The projection device is a view from the front, and the polarizing glasses are a view from the outside. (A) shows the state of the polarizing glasses and the project lens of the projection apparatus when the observer is observing a 3D image without causing crosstalk. Here, the polarization direction of the left and right lenses of the polarized glasses is a square shape inclined 45 °, and the polarization direction of the left and right project lenses of the projection apparatus is the same as that of each lens of the polarized glasses. For example, if the observer tilts his / her face by 45 °, the polarized glasses also tilt by 45 ° with respect to the horizontal angle as shown in (B). At this time, the polarization directions of the left-eye spectacle lens (1210) and the right-eye spectacle lens (1220) are also shifted by 45 °. When the polarized glasses are in such a state, the detection unit (1123) detects a difference value of 45 °, and the projection device rotation unit (1113) detects the difference value of 45 ° based on the detected difference value. ) And the right-eye project lens (1240) are rotated by 45 ° in accordance with the polarization direction of each lens of the polarized glasses, so that the polarization direction of each lens of the polarized glasses matches that of each project lens of the projection apparatus ( (C)). Further, there are various concrete mounting methods for the projection device rotation unit (1113) in FIG. 12, but similarly to the example of the polarization glasses rotation unit of the second embodiment described with reference to FIG. Each project lens of the projection device can be rotated using the.

  (Embodiment 3: Flow of processing)

  FIG. 13 exemplifies a flowchart explaining the flow of processing in the stereoscopic video system according to the present embodiment. A difference value detection step (S1310) and an end determination step (S1330), which will be described later, are the same as S0610 and S0620 in the flowchart illustrated in FIG.

  First, the difference value is detected by constantly monitoring whether the difference value has occurred (difference value detection step S1310).

  Next, in accordance with the difference value detected in the difference value detection step (S1310), the left-eye image polarization unit so that the difference value approaches zero in the left-eye image polarization unit and / or the right-eye image polarization unit of the projection apparatus. And change the polarization direction of the right eye image light. This process is performed by the projection device changing unit (projection device rotation step S1320).

  Finally, it is determined whether the observer has finished observing the 3D image. (End determination step S1330).

  (Embodiment 3: Effect)

  According to the stereoscopic image system of the present embodiment, when the polarizing glasses are tilted by moving the body while observing the 3D image while wearing the polarizing glasses, the left-eye image polarizing unit of the projection device or / In addition, since the polarization direction of the light of the left-eye image and the right-eye image can be changed in the right-eye image polarization unit to match the polarization direction of each lens of the polarized glasses, crosstalk can be eliminated.

The figure which shows the Example of this invention Functional block diagram of a stereoscopic video system according to Embodiment 1 Example of polarization direction of polarizing lens An example of a detection method in the detection unit An example of a detection method in the detection unit FIG. 3 is a flowchart for explaining a processing flow of the stereoscopic video system according to the first embodiment. Functional block diagram of a stereoscopic video system according to Embodiment 2 Example of operation of each lens of polarized glasses The figure which shows the example of mounting of the polarization glasses rotating part FIG. 9 is a flowchart for explaining a processing flow of the stereoscopic video system according to the second embodiment. Functional block diagram of a stereoscopic video system according to Embodiment 3 Example of the operation of each project lens of the projection device FIG. 9 is a flowchart for explaining a processing flow of the stereoscopic video system according to the third embodiment.

Claims (4)

A stereoscopic image system comprising a projection device for projecting a left-eye image and a right-eye image in different polarization directions for recognition by the left and right eyes, and polarized glasses for viewing the image projected from the projection device. The projection device is:
A left-eye image polarization unit that projects a left-eye image on a screen in a first polarization direction;
A right-eye image polarization unit that projects a right-eye image on a screen in a second polarization direction that is different from the first polarization direction;
Have
The polarized glasses
A spectacle lens unit for the left eye for transmitting light in the first polarization direction and recognizing it to the human left eye;
A spectacle lens unit for the right eye for transmitting light in the second polarization direction and recognizing it to the human right eye;
A detection unit that detects a difference value between the first polarization direction or / and the second polarization direction and the polarization direction in which the left-eye spectacle lens unit or / and the right-eye spectacle lens unit can transmit light;
3D video system. The polarized glasses
2. A polarizing glasses rotating unit that rotates each lens of the left-eye spectacle lens unit and / or the right-eye spectacle lens unit according to the detection result of the detection unit so that the difference value approaches zero. The stereoscopic video system described in 1. The projection device is:
Depending on the detection result of the detection unit, the polarization direction of the light of the left-eye image and the right-eye image is changed so that the difference value approaches zero in the left-eye image polarization unit or / and the right-eye image polarization unit. The stereoscopic video system according to claim 1, further comprising a projection device changing unit. A 3D image projection step of projecting a left-eye image on a screen in a first polarization direction and projecting a right-eye image on a screen in a second polarization direction that is a polarization direction different from the first polarization direction. When,
Detecting a difference value between the first polarization direction or / and the second polarization direction and a polarization direction in which the left eyeglass lens or / and the right eyeglass lens can transmit light;
An adjustment signal generating step for generating an adjustment signal for making the difference value zero based on the difference value detected in the detection step;
3D projection apparatus including a polarization angle adjustment method.

Images