JP2013037215A - Stereoscopic image display device, method for causing display device to display stereoscopic image, and program for causing display device to display stereoscopic image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device on which a favorable stereoscopic image is displayed according to an attitude.SOLUTION: A process which a stereoscopic image display device 10 executes includes: a step (S1210) for causing a slit display determination part 105 to detect a slit display determination area 1001 linked with a slit 1000 and an observer reference line 1201 of an observer 1200; a step (S1220) for superimposing the slit display determination area 1001 on the observer reference line 1201; a step for checking whether the observer reference line 1302 intersects with a specific range including a side of a rectangle comprising the slit display determination area 1301; and a step (S1230) for displaying the slit 1000 on a display part according to the check result.

Description

  The present invention relates to image display control, and more specifically to a technique for stereoscopically displaying a plurality of images corresponding to a plurality of viewpoints.

  2. Description of the Related Art Conventionally, there is known a stereoscopic image display method in which an observer can view a stereoscopic image by stereoscopically viewing a set of images having parallax.

  For example, Japanese Patent Application Laid-Open No. 7-92936 (Patent Document 1) discloses a technique for flexibly controlling a slit of a display screen so that an observer can observe a better stereoscopic image. According to the technique disclosed in Japanese Patent Application Laid-Open No. 7-92936, the slit position is moved laterally, so that the observer can observe a better stereoscopic image.

JP-A-7-92936

  Examples of the device for displaying a stereoscopic image include a stationary television, a mobile phone, a smartphone, and a tablet computer. Among these, a portable terminal such as a mobile phone, a smartphone, or a tablet computer, depending on the posture, a stereoscopic image displayed as a three-dimensional image cannot be seen well by the user of the terminal who is the observer. There is a case.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stereoscopic image display device capable of displaying a stereoscopic image so that a better stereoscopic image can be observed. is there.

  Another object is to provide a stereoscopic image display method for a display device to display a better stereoscopic image.

  Still another object is to provide a program for controlling a stereoscopic image display apparatus so that a better stereoscopic image is displayed.

  According to one embodiment, a stereoscopic image display device for displaying a stereoscopic image composed of a plurality of images is provided. The stereoscopic image display device includes an image display unit for displaying an image, a face position detection unit for detecting the face position of an observer observing the image display unit, and a display area of the image display unit. A forming unit for forming a parallax barrier on the front surface and a control unit for controlling the operation of the stereoscopic image display device are provided. The control unit controls the formation of the parallax barrier by the forming unit based on the direction of the parallax barrier formed by the forming unit and the face position detected by the face position detection unit.

  Preferably, the forming unit includes a slit display unit for displaying the slit in front of the display area of the image display unit.

  Preferably, the slit display unit switches the display direction of the slit between a direction parallel to the longitudinal direction of the display area and a direction perpendicular to the longitudinal direction.

  Preferably, the slit display unit is configured to switch between display and non-display of the slit.

  Preferably, the image display unit is configured to change an image displayed on the image display unit in synchronization with the state of the parallax barrier in the forming unit.

  Preferably, the stereoscopic image display device further includes an inertia information detection unit for detecting inertia information of the stereoscopic image display device. The control unit controls the formation of the parallax barrier by the forming unit based on the inertia information.

  According to another embodiment, a method for a display device to display a stereoscopic image is provided. In this method, a parallax barrier is formed based on a step of detecting a face position of an observer observing a monitor of a display device, a detected face position, and a direction of a parallax barrier that can be formed on the monitor. A step of determining whether or not, a step of forming a parallax barrier on the monitor according to a result of the determination in the step of determining, and a step of displaying an image.

  According to yet another embodiment, a program for displaying a stereoscopic image on a display device is provided. The program detects on the display device the position of the face of the observer who is observing the monitor of the display device, based on the detected face position and the direction of the parallax barrier that can be formed on the monitor. The step of determining whether or not to form the image, the step of forming the parallax barrier on the monitor, and the step of displaying the image are executed according to the result of the determination in the determining step.

According to a certain situation, a better stereoscopic image can be observed.
The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings.

3 is a block diagram illustrating an example of a configuration of a stereoscopic image display device 10. FIG. It is a figure for demonstrating the image process with respect to the image for left eyes, and the image for right eyes. It is a figure for demonstrating a mode that the observer is observing a stereo image. FIG. 6 is a diagram illustrating a display example of a slit 300. It is explanatory drawing which shows the image process with respect to the image for left eyes, and the image for right eyes. FIG. 6 is an explanatory diagram showing a state in which an observer is observing a stereoscopic image display device 10. It is explanatory drawing which shows the picked-up image of a camera. It is a figure showing the state where the display surface of the image display part 102 of the three-dimensional image display apparatus 10 exists on XY plane. It is a figure showing the specific example of derivation | leading-out of an observer reference line using the said XY plane. FIG. 3 is a first diagram explicitly showing slits formed in a display area of the stereoscopic image display device 10; FIG. 3 is a second diagram explicitly showing slits formed in the display area of the stereoscopic image display device 10. It is a figure showing the flow of the process which determines whether the slit 1000 parallel to the short side direction of the image display part 102 is displayed. It is a figure showing the positional relationship of an observer reference line and a slit display determination area. It is a figure showing the flow of the said process. It is a figure showing transition of the state which rotated stereoscopic image display device 10 every 45 degrees. 4 is a flowchart illustrating a part of processing executed by the stereoscopic image display apparatus 10. FIG. 21 is a block diagram illustrating an outline of a configuration of a stereoscopic image display apparatus 1700 according to the present modification. 10 is a flowchart showing a part of processing executed by stereoscopic image display apparatus 1700.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  With reference to FIG. 1, the structure of the three-dimensional image display apparatus 10 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a block diagram illustrating an example of the configuration of the stereoscopic image display apparatus 10. As an example, the stereoscopic image display device 10 is realized as a mobile phone, a smartphone, a tablet computer, a PDA (Personal Digital Assistant), a television receiver, or other information processing terminal, but is not limited thereto. The stereoscopic image display device 10 is realized as an information processing terminal capable of displaying a two-dimensional image and displaying a three-dimensional image by forming a parallax barrier.

  As shown in FIG. 1, the stereoscopic image display apparatus 10 includes a central processing unit 100, an image data storage unit 101, an image display unit 102, a slit display unit 103, a face position detection unit 104, and a slit display. The determination unit 105 and the program storage unit 106 are provided.

  The central processing unit 100 controls the operation of each unit of the stereoscopic image display device 10 by executing a program stored in the stereoscopic image display device 10. In one aspect, the central processing unit 100 corresponds to a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and other arithmetic processing devices, and controls each part of the stereoscopic image display device 10 or data Is processed or calculated.

  The image data storage unit 101 holds image data. The image data storage unit 101 stores image data before processing to display a stereoscopic image (for example, the left-eye image 200 and the right-eye image 201 shown in FIG. 2), and displays the stereoscopic image. For this purpose, image data after processing (for example, image 202 in FIG. 2) and the like are stored. In one aspect, the image data storage unit 101 is realized as a volatile memory for providing a working memory area or a non-volatile memory for permanently storing data.

  The image display unit 102 displays an image based on data stored in the image data storage unit 101. In a certain aspect, the image display unit 102 is realized as a liquid crystal display device, an organic EL (Electro Luminescence) panel device, or the like.

  The slit display unit 103 forms a slit as a parallax barrier in the display area of the image display unit 102. For example, the slit display unit 103 switches between the formation (that is, display) and non-formation (that is, non-display) of the slit according to a request from the central processing unit 100, the slit display determination unit 105, and the like. For example, as shown in FIG. 4, the slit display unit 103 includes a display screen 400 that does not display a slit, a display screen 401 that displays a slit parallel to the short side direction of the screen, and a long side of the screen. Switching between slit display and non-display is performed between the display screen 402 displaying slits in parallel with the direction. In addition, although the slit is formed, the display of the slit is a state that cannot be visually recognized by a normal person such as a user of the stereoscopic image display device 10.

  The face position detection unit 104 detects the position of the face of the observer who is looking at the image display unit 102. In one aspect, face position detection unit 104 includes a camera. The camera is realized by a CCD (Charge Coupled Device) camera, a CMOS (Complementary Metal-Oxide Semiconductor) camera, or the like. The face position detection unit 104 detects the position of the face using, for example, a camera that can photograph the face of the observer. The face position detection process will be described later. Information detected by the face position detection unit 104 is used for processing by the slit display determination unit 105.

  The slit display determination unit 105 determines whether to display a slit on the slit display unit 103 based on information from the face position detection unit 104.

  The program storage unit 106 stores a program executed by the central processing unit 100. In one aspect, the program storage unit 106 is realized as a RAM (Random Access Memory) or other volatile memory, or a ROM (Read Only Memory) or a flash memory or other nonvolatile memory. The program storage unit 106 may be incorporated in the stereoscopic image display device 10 or may be detachable from the stereoscopic image display device 10.

  The central processing unit 100, the face position detection unit 104, and the slit display determination unit 105 may be configured as one processor in one aspect, and are configured as a circuit that executes each process in another aspect. May be.

[Parallax barrier method]
Here, the parallax barrier method will be described with reference to FIGS. FIG. 2 is a diagram for explaining image processing for the left-eye image and the right-eye image. As shown in FIG. 2, the left-eye image 200 and the right-eye image 201 are decomposed into strips in the short side direction of the image. As an example, in the stereoscopic image display device 10 according to a certain aspect, the central processing unit 100 and other processors of the stereoscopic image display device 10 arrange the left-eye image 200 and the right-eye image 201 alternately, The image 202 is displayed on a display device included in the display device. The stereoscopic image display device 10 that displays the image 202 has a strip-shaped slit in the same direction as the direction in which the image is decomposed. For example, in a certain aspect, the stereoscopic image display apparatus 10 can form a strip-shaped slit using the slit display unit 103.

  FIG. 3 is a diagram for explaining how an observer observes a stereoscopic image. As shown in FIG. 3, the image 202 displayed on the image display unit 102 of the stereoscopic image display device 10 is visually recognized by the observer through the slit 300. The observer visually recognizes the image for the left eye arranged in a strip shape with the left eye 301 of the observer and the image for the right eye with the right eye 302 through the slit 300, so that a stereoscopic image can be observed.

  Further, the slit 300 can be electrically controlled. For example, when the processor switches the drive signal, the display and non-display of the slit 300 can be switched, and the direction in which the slit 300 is displayed can be switched.

[Image processing]
Switching between display and non-display of the slit 300 and the display direction of the slit 300 will be described with reference to FIGS. FIG. 4 is a diagram illustrating a display example of the slit 300. FIG. 5 is an explanatory diagram showing image processing for the left-eye image and the right-eye image. When the display area of the display device is rectangular, the electrically controllable slit 300 can be displayed in parallel or perpendicular to the short side direction of the display area.

  The display screen 400 is a screen in a display area where the slit 300 is not displayed. The stereoscopic image display apparatus 10 can form the display screen 401 or 402 by electrical control. The display screen 401 displays the slit 300 so that the direction of the slit 300 is parallel to the short side direction of the display screen 400. The display screen 402 displays the slit 300 so that the direction of the slit 300 is perpendicular to the short side direction of the display screen 400. In another aspect, the stereoscopic image display device 10 can switch from the display screen 401 to the display screen 402 or vice versa while the slit 300 is displayed.

  When the stereoscopic image display device 10 forms the slit 300, the stereoscopic image display device 10 needs to display a left-eye image and a right-eye image that are separated into strips in the same direction as the slit 300. At this time, when the slit 300 is displayed so as to be parallel to the short side direction of the display screen as in the display screen 401, the stereoscopic image display device 10 is a strip like the image 202 in FIG. 2. An image in which the left-eye image 200 and the right-eye image 201 separated in a shape are arranged in the same direction as the direction of the slit 300 is displayed. In addition, when the slit 300 is displayed so as to be perpendicular to the short side direction of the display screen, the stereoscopic image display device 10 is used for the left eye that is decomposed into a strip shape like the image 500 of FIG. An image in which the image 200 and the right eye image 201 are arranged in the same direction as the slit direction is displayed.

[Face position detection]
The operation of the face position detection unit 104 will be described with reference to FIGS. In the present embodiment, an example will be described in which a straight line connecting the left eye and the right eye of an observer is detected as information detected by the face position detection unit 104. FIG. 6 is an explanatory diagram showing a state in which the observer observes the stereoscopic image display device 10. FIG. 7 is an explanatory diagram showing a captured image of the camera.

  As shown in FIG. 6, the observer 600 observes the image display unit 102 of the stereoscopic image display device 10. Specifically, the observer 600 observes the image display unit 102 in a form facing the image display unit 102 from the front. The stereoscopic image display device 10 includes a camera 603 on the same surface as the image display unit 102. The camera 603 can photograph the face of the observer including both eyes.

  Referring to FIG. 7, an image 700 corresponds to an image for one frame while the camera 603 continuously photographs the observer 600. Since the observer 600 is observing the image display unit 102 from the front, similarly, the observer 600 is also facing the camera 603 from the front. Therefore, the right eye 604 of the observer 600 corresponds to the right eye portion 701 of the image 700, and the left eye 605 corresponds to the left eye portion 702 of the image 700. Note that the image 700 does not need to be displayed to the observer 600 and may be stored only in the image data storage unit 101 included in the stereoscopic image display device 10.

  Next, the face position detection unit 104 detects a straight line 703 connecting the right eye part 701 and the left eye part 702 from the image 700. The face position detection unit 104 performs detection processing on uncompressed image data such as YUV data and RGB data obtained from the output of the camera 603.

  In another aspect, the face position detection unit 104 may perform detection processing after processing image data in order to increase detection accuracy. In addition, the face position detection unit 104 may use all frames output from the camera 603 in a certain aspect for detection processing, and in another aspect, for example, a specific number such as being performed every 10 frames. It may be performed every frame. The calculation of the detection process is not limited to a mode in which only the face position detection unit 104 executes the calculation necessary for the detection process, and the central processing unit 100 may perform the calculation.

  Also, the information detected by the face position detection unit 104 is not limited to the line connecting both eyes, but may be information that can specify the face position, such as the face outline, nose position, mouth position, ear position, etc. Anything Further, the face position detection unit 104 may detect the face position by using a plurality of these pieces of information. Further, although an example using a camera as a means for detecting a face position is shown as an example in the present embodiment, other sensors may be used as long as the face position can be detected.

  Next, the derivation of the observer reference line by the stereoscopic image display device 10 will be described with reference to FIGS. FIG. 8 is a diagram illustrating a state in which the display surface of the image display unit 102 of the stereoscopic image display apparatus 10 exists on the XY plane. FIG. 9 is a diagram illustrating a specific example of the derivation of the observer reference line using the XY plane. Here, an example of a method for calculating the observer reference line when the information detected by the face position detection unit 104 is a straight line connecting the right eye and the left eye of the observer will be described.

  The face position detection unit 104 derives the observer reference line as follows. A straight line 801 that connects the right eye and the left eye of the observer exists at a position that does not intersect the XY plane.

  As shown in FIG. 9, the slit display determination unit 105 calculates a projection line 900 obtained by projecting a straight line 801 connecting the right eye and the left eye of the observer onto the XY plane. For example, if the coordinates of two points that form a straight line 801 connecting the observer's right eye and left eye are b1 (Xb1, Yb1, Zb1) and b2 (Xb2, Yb2, Zb2), respectively, the slit display determination unit 105 is an XY plane. The coordinates of the two points that form the projection line 900 projected onto are c1 (Xb1, Yb1,0) and c2 (Xb2, Yb2, 0), respectively. The face position detection unit 104 uses the projection line 900 as an observer reference line. The timing at which the process for obtaining the observer reference line is performed is, for example, three-dimensional with respect to the stereoscopic image display device 10 when the stereoscopic image display device 10 is turned on or when an application for displaying an image is started. When the instruction to display the image is given, immediately before the image data for stereoscopic display is displayed based on the data read from the non-volatile memory area to the work area, etc. Not limited to.

[Slit display judgment area]
Next, the slit display determination area will be described with reference to FIGS. 10 and 11. 10 and 11 are views explicitly showing slits formed in the display area of the stereoscopic image display device 10.

  First, the slit display determination area is determined for each slit direction that can be displayed by the slit display unit 103. The slit display area is prepared (defined) for each slit direction that can be displayed by the slit display unit 103, and the slit direction and the slit display determination area are associated with each other.

  For example, when the slit 1000 is displayed in parallel with the short side direction of the image display unit 102 as shown in the state (A), on the same plane as the image display unit 102 as shown in the state (B). The rectangular slit display determination area 1001 is defined in advance so that the side perpendicular to the direction of the slit 1000 is a long side. Data representing the slit display determination area 1001 is stored in, for example, the data storage area of the central processing unit 100, the image data storage unit 101, or the program storage unit 106.

  Further, as shown in FIG. 11, when the slit 1100 is displayed in parallel with the long side direction of the image display unit 102, the slit 1100 is formed on the same plane as the image display unit 102 as in FIG. A rectangular slit display determination area 1101 is defined in advance so that the side orthogonal to the direction becomes the long side. Data representing the slit display determination area 1101 is also stored in the data storage area of the central processing unit 100, the image data storage unit 101, or the program storage unit 106, for example.

  The slit display determination unit 105 determines whether or not the observer reference line intersects a specific side of the slit display determination area when the observer reference line and the slit display determination area 1001 or the slit display determination area 1101 are overlapped. By detecting, it is determined whether or not to display a slit associated with the slit display determination area.

  Therefore, with reference to FIG. 12 and FIG. 13, the determination of whether to display the slit 1000 will be described. FIG. 12 is a diagram illustrating a flow of processing for determining whether to display the slit 1000 that is parallel to the short side direction of the image display unit 102. FIG. 13 is a diagram illustrating the positional relationship between the observer reference line and the slit display determination area.

  First, in step S <b> 1210, the slit display determination unit 105 detects a slit display determination region 1001 associated with the slit 1000 and an observer reference line 1201 for the observer 1200.

  In step S1220, the slit display determination unit 105 superimposes the slit display determination region 1001 and the observer reference line 1201. At this time, as shown in FIG. 13, the position is defined so that the observer reference line 1302 passes through a point 1300 where the rectangular diagonal lines constituting the slit display determination region 1301 intersect. In this state, the slit display determination unit 105 checks whether or not the observer reference line 1302 intersects a specific range having a rectangular side that forms the slit display determination region 1301. If the observer reference line 1302 and the specific range intersect, the slit display determination unit 105 determines to display a slit associated with the slit display determination region 1301, and if not, the slit display determination unit 105 Determines not to display the slit.

  In step S1230, for example, in the case of FIG. 12, assuming that “a specific range having a rectangular side” is two short sides of the four sides of the rectangle constituting the slit display determination region 1001, the slit display determination unit 105 Determines that the slit is to be displayed from the state 1202 shown in step 1220, and displays the slit 1000 on the display unit.

  Next, with reference to FIG. 14, a process in which the slit display determination unit 105 determines whether to display the slit 1100 that is parallel to the long side direction of the image display unit 102 will be described. FIG. 14 is a diagram showing the flow of the processing.

  First, in step S <b> 1410, the slit display determination unit 105 detects a slit display determination region 1101 associated with the slit 1100 and an observer reference line 1201 of the observer 1200.

  In step S1420, slit display determination unit 105 superimposes slit display determination region 1101 and observer reference line 1201. Here, since the observer reference line 1201 and the two short sides of the rectangle constituting the slit display determination area 1101 do not intersect, the slit display determination unit 105 determines that the slit 1100 is not displayed. In the present embodiment, an example in which the slit display determination area 1101 is a rectangle is shown, but the shape of the slit display determination area 1101 may be other than a rectangle.

  In step S1430, stereoscopic image display apparatus 10 displays an image without displaying a slit. Therefore, in this case, the stereoscopic image display apparatus 10 displays an image using data for displaying a two-dimensional image.

  With reference to FIG. 15, an example of processing when the stereoscopic image display apparatus 10 is rotated counterclockwise (counterclockwise) while the observer is observing the image display unit 102 will be described. FIG. 15 is a diagram illustrating the transition of the state in which the stereoscopic image display apparatus 10 is rotated by 45 °.

  In the state 1500, the observer 1200 is observing the image display unit 102. The slit display determination unit 105 superimposes the observer reference line 1201 obtained from the data detected by the face position detection unit 104 and the slit display determination region 1001 associated with the slit 1000, and also provides an observer reference. The line 1201 and the slit display determination area 1101 associated with the slit 1100 are overlapped. The slit display determination unit 105 determines that the slit 1000 is displayed and the slit 1100 is not displayed based on the overlap result. The slit display unit 103 displays only the slit 1000 based on the determination result. At this time, the image displayed on the image display unit 102 is an image that enables the observer to view the image stereoscopically through the slit 1000. For example, in the present embodiment, like the image 202 shown in FIG. 2, the image display unit 102 has an image 200 for the left eye and a right eye divided into strips as images arranged in the same direction as the slit 1000. A work image 201 is displayed.

  When the stereoscopic image display device 10 is rotated by 45 °, the state after the rotation is indicated by a state 1501. The slit display determination unit 105 determines that the slit 1000 and the slit 1100 are not displayed based on the result of the overlap between the observer reference line 1201 and the slit display determination areas 1001 and 1101. The slit display unit 103 does not display a slit based on the determination result. In this case, since the observer cannot recognize the image displayed on the image display unit 102 as a three-dimensional image, the image display unit 102, for example, as a two-dimensional image, the left-eye image 200 or the right-eye image 201 in FIG. Either one of the images is displayed.

  When the stereoscopic image display device 10 is further rotated by 45 °, the state after the rotation is indicated by a state 1502. The slit display determination unit 105 determines that the slit 1100 is displayed without displaying the slit 1000 based on the result of superimposing the observer reference line 1201 and the slit display determination regions 1001 and 1101. The slit display unit 103 displays only the slit 1100 based on the determination result. At this time, the image displayed on the image display unit 102 displays an image that allows the observer to recognize the image as a stereoscopic image through the slit 1100 as in the case of the state 1500.

  With reference to FIG. 16, a control structure of stereoscopic image display apparatus 10 according to the present embodiment will be described. FIG. 16 is a flowchart showing a part of the process executed by the stereoscopic image display apparatus 10. The processing starts when, for example, the observer operates the stereoscopic image display device 10 and gives an instruction to the stereoscopic image display device 10 to display a three-dimensional image.

  In step S1610, central processing unit 100 determines whether or not image display unit 102 can display a stereoscopic image based on the attribute of data designated as a display target. A three-dimensional image is an image used for making an observer recognize as a three-dimensional image. As an example, as described above, an image observed through a slit such as the image 202 in FIG. 2 or the image 500 in FIG. 5 and an observation without passing through the slit as in the image 200 for the left eye or the image 201 for the right eye in FIG. The image to be displayed is shown. When central processing unit 100 determines that image display unit 102 can display a stereoscopic image (YES in step S1620), control is switched to step S1620. If not (NO in step S1620), central processing unit 100 ends the control.

In step S1620, face position detection unit 104 detects the face position of the observer.
In step S1630, slit display determination unit 105 detects a slit display determination area associated with the slit.

  In step S1640, slit display determination unit 105 displays a slit (hereinafter referred to as “vertical slit”) parallel to the short side direction of image display unit 102 based on the data obtained in steps S1620 and S1630. Determine whether it is possible. When slit display determination unit 105 determines to display the slit (YES in step S1640), control is switched to step S1650. Otherwise (NO in step S1640), slit display determination unit 105 switches control to step S1660.

In step S1650, slit display unit 103 displays a vertical slit.
In step S1660, slit display determination unit 105 determines whether it is possible to display a slit parallel to the long side direction of image display unit 102 (hereinafter referred to as “horizontal slit”). When slit display determination unit 105 determines that the slit can be displayed (YES in step S1660), control is switched to step S1670. If not (NO in step S1660), slit display determination unit 105 switches control to step S1680.

In step S1670, slit display unit 103 displays a horizontal slit.
In step S1680, slit display unit 103 displays neither a vertical slit nor a horizontal slit.

  In step S1690, image display unit 102 displays an image corresponding to the display state of the slit. If no slit is displayed, the image display unit 102 displays a two-dimensional image specified in accordance with a predetermined rule.

[Effect of Example]
As described above, according to the stereoscopic image display device 10 according to the embodiment of the present invention, the positional relationship between the observer's eyes and the stereoscopic image display device 10 is detected, and as a parallax barrier according to the positional relationship. The display / non-display (formation / non-formation) of the slits is controlled. In this way, a three-dimensional image is displayed according to the attitude of the stereoscopic image display device 10, or a two-dimensional image is displayed. Therefore, even if the image display mode of the stereoscopic image display device 10 is set to three-dimensional, an image that is easy for the observer to visually recognize is displayed.

<< Modification >>
A modification of the present embodiment will be described with reference to FIG. FIG. 17 is a block diagram showing an outline of the configuration of a stereoscopic image display apparatus 1700 according to this modification. The stereoscopic image display apparatus 1700 is different from the above-described stereoscopic image display apparatus 10 in that it further includes a function of detecting inertia information.

  That is, the stereoscopic image display device 1700 further includes an inertial information detection unit 1710 in addition to the configuration shown in FIG. The inertia information detection unit 1710 detects movement information of the stereoscopic image display device 1700 when the observer tilts, rotates, or moves the stereoscopic image display device 1700. For example, the stereoscopic image display device 1700 is realized as an acceleration sensor, an angular velocity sensor, an inclination sensor, or the like.

  A usage example of motion information from the inertia information detection unit 1710 will be described. As described above, the slit display determination unit 105 controls the display and non-display of the slit. The slit display determination unit 105 does not always need to perform the process associated with this control. For example, it may be performed only when the observer or the stereoscopic image display apparatus 10 moves and the positional relationship between the observer and the stereoscopic image display apparatus 1700 changes.

  For example, the face position detection unit 104 detects position information of the observer's face using a camera or the like. If the camera is always in a shooting state, the current consumption increases, and therefore the remaining battery level of the stereoscopic image display device 10 is quickly reduced. Therefore, the stereoscopic image display apparatus 1700 according to the present modification detects whether or not the stereoscopic image display apparatus 1700 has moved based on the motion information from the inertia information detection unit 1710, and only when there is a movement, Each unit of the image display device 1700 may be operated. For example, the central processing unit 100 quantifies the motion information from the inertial information detection unit 1710 and determines that the stereoscopic image display device 1700 has moved when this value exceeds a certain threshold. to decide. When there is a movement in the stereoscopic image display device, the central processing unit 100 operates the face position detection unit 104 or the slit display determination unit 105 to execute slit display control. On the other hand, when there is no movement of the stereoscopic image display device 1700, the central processing unit 100 does not operate the face position detection unit 104 or the slit display determination unit 105, and does not execute processing for slit display control. The motion information detection process from the inertial information detection unit 1710 may be performed every certain time, for example, once every 100 milliseconds.

[Control structure]
Next, a control structure of the stereoscopic image display apparatus 1700 according to this modification will be described with reference to FIG. FIG. 18 is a flowchart showing a part of the process executed by stereoscopic image display apparatus 1700. The same steps as those described above are denoted by the same step numbers. Therefore, the description of the same process will not be repeated.

  In step S1610, central processing unit 100 determines whether or not image display unit 102 can display a stereoscopic image based on the attribute of data designated as a display target. When central processing unit 100 determines that image display unit 102 can display a stereoscopic image (YES in step S1620), control is switched to step S1810. If not (NO in step S1620), central processing unit 100 ends the control.

  In step S1810, inertia information detection unit 1710 detects motion information of stereoscopic image display device 1700. The motion information is sent to the central processing unit 100.

  In step S1820, central processing unit 100 determines whether or not stereoscopic image display apparatus 1700 has moved based on the movement information. When central processing unit 100 determines that there is a movement (YES in step S1820), control is switched to step S1620. If not (NO in step S1820), central processing unit 100 returns control to step S1810.

[Effect of modification]
As described above, the stereoscopic image display apparatus 1700 according to the present modification executes the processes after step S1620 when the movement is detected. Therefore, for example, it is not necessary to always keep the camera on standby for detecting the face of the observer, so that the battery consumption of the stereoscopic image display device 1700 is suppressed.

  The technical idea of the stereoscopic image display devices 10 and 1700 according to the embodiment of the present invention is realized by each processing step. Therefore, the technical idea can also be realized by causing a processor to execute a program that executes each processing step, and thus can be realized by a memory that stores a program and a processor that executes the program.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention relates to a portable information processing terminal such as a mobile phone, a smart phone, an electronic book reader, a tablet computer, a PDA, a portable television receiver, and a two-dimensional image or image by forming a parallax barrier. The present invention can be applied to an information processing terminal that can display a three-dimensional image.

  10, 1700 stereoscopic image display device, 100 central processing unit, 101 image data storage unit, 102 image display unit, 103 slit display unit, 104 face position detection unit, 105 slit display determination unit, 106 program storage unit, 200 for left eye Image, 201 Right eye image, 202, 500, 700 image, 300, 1000, 1100 Slit, 301, 605 Left eye, 302, 604 Right eye, 400, 401, 402 Display screen, 600, 1200 Observer, 603 Camera, 701 Right eye Part, 702 left eye part, 703, 801 straight line, 900 projection line, 1001, 1101, 1301 slit display determination area, 1201, 1302 observer reference line, 1710 inertia information detection unit.

Claims (8)

A stereoscopic image display device for displaying a stereoscopic image composed of a plurality of images,
An image display unit for displaying an image;
A face position detection unit for detecting the face position of an observer observing the image display unit;
Forming means for forming a parallax barrier in front of the display area of the image display unit;
Control means for controlling the operation of the stereoscopic image display device,
The control means controls the formation of the parallax barrier by the forming means based on the direction of the parallax barrier formed by the forming means and the face position detected by the face position detecting unit. .   The stereoscopic image display apparatus according to claim 1, wherein the forming unit includes a slit display unit for displaying a slit in front of a display area of the image display unit.   The stereoscopic image display device according to claim 2, wherein the slit display unit switches a display direction of the slits between a direction parallel to the longitudinal direction of the display area and a direction perpendicular to the longitudinal direction.   The stereoscopic image display device according to claim 1, wherein the slit display unit is configured to switch between display and non-display of a slit.   5. The image display unit according to claim 1, wherein the image display unit is configured to change an image to be displayed on the image display unit in synchronization with a state of a parallax barrier in the forming unit. 3D image display device. An inertial information detector for detecting inertial information of the stereoscopic image display device;
The stereoscopic image display device according to claim 1, wherein the control unit controls the formation of a parallax barrier by the forming unit based on the inertia information. A method for a display device to display a stereoscopic image,
Detecting the face position of an observer observing the monitor of the display device;
Determining whether to form a parallax barrier based on the detected face position and the direction of the parallax barrier that can be formed on the monitor;
Forming a parallax barrier on the monitor according to a result of the determination in the determining step;
Displaying the image. A program for displaying a stereoscopic image on a display device, the program being displayed on the display device,
Detecting the face position of an observer observing the monitor of the display device;
Determining whether to form a parallax barrier based on the detected face position and the direction of the parallax barrier that can be formed on the monitor;
Forming a parallax barrier on the monitor according to a result of the determination in the determining step;
A program for executing an image display step.

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