JP2014066539A - Optical parameter measuring apparatus, optical parameter measuring method, and directional display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical parameter measuring apparatus capable of easily measuring an optical parameter.SOLUTION: A reference image creating part 11 creates a reference image signal comprising first and second reference images whose inclination angles or periods are different. A directional display device 50 has such a structure that an optical member 52 is fixed to a display device 51. An optical parameter calculating part 22 calculates the relative inclination angle of the optical member 52 with respect to the display device 51 and the period of the optical member 52 by using the period of the first reference image, the inclination angle and period of a first moire included in a first captured image signal obtained by capturing a screen on which the first reference image is displayed by a display image capturing part 21, the period of the straight line group of the second reference image, and the inclination angle and period of a second moire included in a second captured image signal obtained by capturing the screen on which the second reference image is displayed.

Description

  The present invention relates to an optical parameter measuring device and an optical parameter capable of measuring an optical parameter of an image display device in which an optical member having a one-dimensional periodic structure is arranged on a screen of a display device in which pixels are arranged two-dimensionally. It relates to a measurement method. The present invention also relates to a directional display device that can display different images depending on the angle at which the screen is viewed, such as an autostereoscopic display device.

  There is a directional display device having directivity that can display different images depending on the viewing angle of the screen. As an example, the directional display device can be used as an autostereoscopic display device that displays a plurality of parallax images on pixels assigned to the parallax images, thereby causing the display image to be stereoscopically viewed. A directional display device having directivity in one dimension is generally arranged by placing an optical member having a periodic structure in one dimension on a screen of a display device in which pixels are arranged in two dimensions, such as a liquid crystal panel. The optical member is fixed to the display device.

  When the directional display device is configured by fixing the optical member on the screen of the display device, it is necessary to adjust the mounting position of the optical member with respect to the display device with an accuracy equal to or less than the pixel of the display device. In recent years, with the increase in resolution of display devices, the size of pixels has been reduced, and the required accuracy when adjusting the mounting position of an optical member has increased. Therefore, an optical parameter measurement device and an optical parameter measurement method that can accurately measure the relative mounting position between the optical member and the display device are required.

  As an example, Patent Document 1 discloses an optical member (lenticular lens) by displaying a group of parallel straight lines with a predetermined interval on the screen of a display device, observing the moire generated and adjusting the angle and interval of the group of parallel straight lines. The lens pitch and the arrangement angle of the optical member with respect to the display device are described.

JP 2007-65441 A

  In the method described in Patent Document 1, the angle of the parallel straight line group must be adjusted so that the boundary line of each lens of the lenticular lens and the moire angle are matched, and the interval of the parallel straight line group must be adjusted so as to eliminate the moire. Don't be. As described above, as the resolution of the display device is increased, the pixel size is reduced, so that the period of the lenticular lens is also reduced. Therefore, it is not easy to match the lens boundary line with the moire angle.

  Moreover, the method described in Patent Document 1 requires a dynamic process in which the boundary line of the lens and the angle of the moire are matched and the interval between the parallel straight line groups is adjusted so that the moire is eliminated. The measurement process is complicated.

  In view of such problems, it is an object of the present invention to provide an optical parameter measuring apparatus and an optical parameter measuring method capable of easily measuring an optical parameter. It is another object of the present invention to provide a directional display device that can correctly display an image even if optical parameters are not appropriate.

  In order to solve the above-described problems of the related art, the present invention provides an optical member (52) having a periodic structure composed of a plurality of optical elements in one dimension on the screen of a display device (51) in which pixels are arrayed in two dimensions. A reference image signal made up of first and second reference images of two types of straight line groups with different inclination angles and periods displayed on a directional display device (50) having a fixed structure. A reference image creation unit (11) to be created, and a display image imaging unit that captures the screen in a state in which the display device displays the first and second reference images individually or simultaneously by the reference image signal ( 21), the period of the straight line group of the first reference image, and a first captured image obtained by capturing the screen in a state where the display image capturing unit displays the first reference image on the display device. Signal A tilt angle and a period of the first moire, which is an angle formed by a direction perpendicular to the stripe pattern line of the first moire and the straight line group of the first reference image, and the second reference. The period of the straight line group of the image and the second moire of the second captured image signal captured from the screen in a state where the display image capturing unit displays the second reference image on the display device. The relative angle of the optical member with respect to the display device using the inclination angle and period of the second moire, which is an angle formed between a direction orthogonal to a striped line and a straight line group of the second reference image. There is provided an optical parameter measurement device comprising an optical parameter calculation unit (22) for calculating a typical inclination angle and a period of the optical member.

  In the optical parameter measurement device, the reference image creation unit creates a first reference image signal composed of the first image and a second reference image signal composed of the second image, respectively, The display image capturing unit is configured to display the first image on the display device based on the first reference image signal, and to display the second image on the display device based on the second reference image signal. It is preferable to individually capture the screen in a state where an image is displayed.

  In the optical parameter measurement device, the reference image creation unit creates a reference image signal composed of a composite image including a first region composed of the first image and a second region composed of the second image. The display image capturing unit captures the screen in a state where the composite image is displayed on the display device by the reference image signal so as to include the first and second regions, and calculates the optical parameter. The unit extracts a signal portion corresponding to the first region included in the captured image signal obtained by imaging the screen to obtain the first captured image signal, and the first image included in the captured image signal obtained by imaging the screen. A signal portion corresponding to the second region may be extracted and used as the second captured image signal.

In the optical parameter measurement apparatus, the optical parameter calculation unit may set the period of the first or second reference image to L, the period of the first or second moire to Λ, and the first or second moire. When the inclination angle is ΔΦ, the straight line group of the first or second reference image is adjacent to the plurality of optical elements on the basis of the following equations (1) and (2) that are in the same order as the compound code. Find the angle error Δθ and the period error ΔL with the boundary line of the optical element,
Δθ = ± (L / Λ) × cos ΔΦ (1)
ΔL = ± (L ² / Λ) × sin ΔΦ (2)
The relative inclination angle of the optical member with respect to the display device and the period of the optical member are calculated based on the four types of angle error Δθ and period error ΔL obtained from the equations (1) and (2). preferable.

  In order to solve the above-described problems of the conventional technology, the present invention provides an optical member having a periodic structure of a plurality of optical elements in one dimension on the screen of a display device (51) in which pixels are arrayed in two dimensions. 52) is fixed, and an inclined straight line to be displayed on the directional display device (50) in which it is compensated that the mounting accuracy of the optical member with respect to the display device is within a predetermined angle is predetermined. A reference image creation unit (11) for creating a reference image signal composed of reference images of straight line groups arranged in a cycle of: the screen in a state where the reference image is displayed on the display device by the reference image signal The display image imaging unit (21) for imaging, the period of the straight line group of the reference image, and the screen imaged in a state where the display image is displayed on the display device by the display image imaging unit The optical member for the display device using an inclination angle and a period of the moire, which is an angle formed between a direction perpendicular to a moire stripe pattern line included in an image signal and a straight line group of the reference image And an optical parameter calculation unit (22) for calculating a relative inclination angle of the optical member and a period of the optical member.

  Furthermore, in order to solve the above-described problems of the related art, the present invention provides an optical member having a periodic structure including a plurality of optical elements in one dimension on the screen of a display device (51) in which pixels are arrayed in two dimensions. 52) to the directional display device (50) having a fixed structure, a reference image signal composed of the first and second reference images of two types of straight line groups in which at least one of the inclination angle and the period is different. Supplying the first and second reference images on the screen, and capturing the screen in a state where the first and second reference images are displayed individually or simultaneously on the screen, The period of the straight line group of the first reference image and the stripe pattern of the first moire included in the first captured image signal obtained by imaging the screen in a state where the first reference image is displayed on the screen. A direction perpendicular to the line and the first The inclination angle and period of the first moire, which is an angle formed by the straight line group of the quasi-image, the period of the straight line group of the second reference image, and the second reference image are displayed on the screen. The second angle which is an angle formed between a direction perpendicular to a second moire stripe pattern line included in a second captured image signal obtained by capturing the screen in a state and a straight line group of the second reference image. An optical parameter measurement method is provided, wherein a relative inclination angle of the optical member with respect to the display device and a period of the optical member are calculated using the inclination angle and period of the moire.

  In order to solve the above-described problems of the conventional technology, the present invention provides an optical member having a periodic structure of a plurality of optical elements in one dimension on the screen of a display device (51) in which pixels are arrayed in two dimensions. 52) is fixed, and the directional display device (50) in which the mounting accuracy of the optical member with respect to the display device is compensated for within a predetermined angle is applied to the inclined straight line at a predetermined cycle. A reference image signal composed of a reference image of a straight line group arranged in the above is displayed, and the screen in a state in which the reference image is displayed on the screen is imaged, and a cycle of the straight line group of the reference image and the screen The inclination of the moiré that is an angle formed by a direction perpendicular to a moiré stripe pattern line included in a captured image signal obtained by imaging the screen in a state where the reference image is displayed and a straight line group of the reference image. Corner By using the fine periodic provides an optical parameter measurement method characterized by calculating the period of the optical member and the relative inclination angle of the optical member with respect to the display device.

  Furthermore, the present invention solves the above-described problems of the prior art, and an optical member having a periodic structure of a plurality of optical elements in one dimension on the screen of a display device (51) in which pixels are arranged in two dimensions. Correspondence of which pixel in the display device each pixel data of the plurality of image signals is displayed when a plurality of image signals are displayed on the directional display device (50) having a structure in which (52) is fixed A pixel data array unit (31) for arraying pixel data of each of the plurality of image signals, a relative inclination angle of the optical member with respect to the display device, and the optical member And a table updating unit (33) for updating the information set in the table based on the period of the directional display device.

  According to the optical parameter measuring device and the optical parameter measuring method of the present invention, the optical parameters can be easily measured. According to the directional display device of the present invention, an image can be displayed correctly even if the optical parameter is not appropriate.

It is a block diagram which shows the optical parameter measuring apparatus of 1st Embodiment. It is a figure which shows two types of reference | standard images used by 1st Embodiment. It is a figure which shows the example of the image containing the moire displayed on a screen in 1st Embodiment. It is a figure for demonstrating the principle which calculates the inclination-angle and period of an optical member. FIG. 5 is a diagram illustrating a case where moire in the same direction occurs in the same cycle although the relationship between the straight line and the lens boundary line is different from that in FIG. 4. It is a block diagram which shows the optical parameter measuring apparatus of 2nd Embodiment. It is a figure which shows the reference | standard image used by 2nd Embodiment. It is a figure which shows the example of the image containing the moire displayed on a screen in 2nd Embodiment. It is a block diagram which shows the optical parameter measuring apparatus of 3rd Embodiment. It is a figure which shows the reference | standard image used by 3rd Embodiment. It is a figure which shows the example of the image containing the moire displayed on a screen in 3rd Embodiment. It is a block diagram which shows the directional display apparatus of 4th Embodiment.

  Hereinafter, an optical parameter measurement device, an optical parameter measurement method, and a directivity display device according to each embodiment will be described with reference to the accompanying drawings. The first to third embodiments are embodiments related to an optical parameter measurement device and an optical parameter measurement method, and the fourth embodiment is an embodiment related to a directional display device.

<First Embodiment>
In FIG. 1, a directional display device 50 has a lenticular lens 52 arranged as an example of an optical member having a periodic structure of a plurality of optical elements in one dimension on a screen of a display device 51 in which pixels are arrayed in two dimensions. And have a fixed structure. In the case of the lenticular lens 52, the optical element is a cylindrical lens.

  The lenticular lens 52 may be bonded to the screen of the display device 51, or the lenticular lens 52 may be attached to the display device 51 using a screw or the like. The display device 51 is, for example, a liquid crystal panel. The display device 51 may be a so-called matrix type display device.

  The lenticular lens 52 is an array of a plurality of cylindrical lenses. The lenticular lens 52 is attached to the display device 51 in a state where a boundary line (hereinafter, lens boundary line) 521 between adjacent cylindrical lenses is inclined with respect to the vertical direction of the display device 51. In other words, the periodic direction of the lenticular lens 52 (cylindrical lens) is arranged in an inclined state with respect to the horizontal direction of the pixel array. The period of the lenticular lens 52 and the relative angle between the display device 51 and the lenticular lens 52 have a predetermined design center.

  Blocks other than the directional display device 50 constitute an optical parameter measuring device. However, what the directional display device 50 has can be used for the image display drive unit 13. As will be described later, the optical parameter measuring device measures the lens pitch (period) of the lenticular lens 52 and the relative angle between the display device 51 and the lenticular lens 52 as optical parameters.

  Based on the control by the control unit 14, the reference image creation unit 11 performs a reference image signal Sva that is a reference image of an inclined straight line group as illustrated in FIG. 2A and a reference image signal Sva as illustrated in FIG. A reference image signal Svb, which is a reference image of a straight line group that is inclined, is generated and output.

  As shown in FIG. 2A, in the reference image of the straight line group based on the reference image signal Sva, the inclination angle of each straight line 111 is θa, and the straight line pitch that is the straight line period is La. In the straight line group reference image based on the reference image signal Svb, as shown in FIG. 2B, the inclination angle of each straight line 111 is θb and the straight line pitch is Lb. It is assumed that the design center of the tilt angle of the lenticular lens 52 with respect to the vertical direction of the display device 51 is 16 °. In this case, the inclination angle θa is 15 °, for example, and the inclination angle θb is 17 °, for example. The linear pitches La and Lb are, for example, 0.5 mm.

  The reference image creation unit 11 generates two reference image signals Sva and Svb in which at least one of the inclination angles θa and θb and the periods (straight line pitches) La and Lb of the reference image 111 composed of a plurality of straight lines 111 is different. create. In the first embodiment, an example will be described in which the reference image signals Sva and Svb having the same periods La and Lb and different inclination angles θa and θb are used as described above.

  The reference image signals Sva and Svb output from the reference image creation unit 11 are held in the reference image holding unit 12. In the configuration shown in FIG. 1, since the reference image creation unit 11 creates the reference image signals Sva and Svb at a time and outputs both, the reference image holding unit 12 temporarily holds the reference image signals Sva and Svb. Is required. If the reference image generating unit 11 generates and outputs the reference image signal Sva after the reference image generating unit 11 generates and outputs the reference image signal Sva based on the control by the control unit 14, the reference image holding unit 12 is omitted. Is also possible.

  First, the control unit 14 controls the reference image holding unit 12 so as to read the reference image signal Sva held in the reference image holding unit 12. The reference image signal Sva read from the reference image holding unit 12 is input to the image display driving unit 13. The image display drive unit 13 drives the directional display device 50 so that the directional display device 50 displays the reference image signal Sva. The control unit 14 supplies an identification signal indicating that the reference image signal Sva is displayed to the control unit 23 when the reference image signal Sva is displayed.

  The display image imaging unit 21 images the entire screen of the directional display device 50 based on control by the control unit 23. The display image capturing unit 21 may be a general digital camera. In a state where the directional display device 50 displays the reference image signal Sva, the captured image signal Sia obtained by capturing the screen by the display image capturing unit 21 is input to the optical parameter calculating unit 22.

  When the control unit 23 inputs the captured image signal Sia to the optical parameter calculation unit 22, the control unit 14 completes the imaging of the image by the reference image signal Sva to the control unit 14, and uses the captured image signal Sia as the optical parameter calculation unit 22. An end confirmation signal indicating that the data has been transferred to is supplied.

  When receiving the end confirmation signal from the control unit 23, the control unit 14 controls the reference image holding unit 12 to read the reference image signal Svb held in the reference image holding unit 12. The reference image signal Svb read from the reference image holding unit 12 is input to the image display driving unit 13. The image display driving unit 13 drives the directional display device 50 so that the directional display device 50 displays the reference image signal Svb. The control unit 14 supplies an identification signal indicating that the reference image signal Svb is displayed to the control unit 23 when the reference image signal Svb is displayed.

  The display image capturing unit 21 captures the screen of the directional display device 50 displaying the reference image signal Svb based on the control by the control unit 23. The captured image signal Sib obtained by capturing the screen by the display image capturing unit 21 is input to the optical parameter calculating unit 22. When the control unit 23 inputs the captured image signal Sib to the optical parameter calculation unit 22, the control unit 14 completes imaging of the image by the reference image signal Svb, and the captured image signal Sib is converted into the optical parameter calculation unit 22. An end confirmation signal indicating that the data has been transferred to is supplied.

  When the reference image signals Sva and Svb are displayed on the screen of the directional display device 50, the inclination angles θa and θb of the straight line 111 and the periods La and Lb are set so that moire is generated in the image displayed on the screen. Reference image signals Sva and Svb of the straight line group. The inclination angles θa and θb may be two angles so that the design center of the inclination angle is in between, and may be an angle that causes moire.

  3A shows an example of an image displayed on the screen when the reference image signal Sva is supplied to the directional display device 50, and FIG. 3B shows the reference image signal Svb supplied to the directional display device 50. An example of an image displayed on the screen when the operation is performed is shown. In the image shown in FIG. 3A, the inclination angle of the moiré periodic direction with respect to the vertical direction (the angle formed between the direction perpendicular to each line of the striped pattern by the moire and the vertical direction) is Φa, and the period of the line The moiré pitch is Λa. In the image shown in FIG. 3B, the inclination angle of the moire periodic direction with respect to the vertical direction is Φb, and the moire pitch is Λb.

  The optical parameter calculation unit 22 uses the captured image signal Sia indicating the image in FIG. 3A and the captured image signal Sib indicating the image in FIG. 3B, and the tilt angle and period of the lenticular lens 52. And calculate.

  The principle of calculating the tilt angle and period of the lenticular lens 52 will be described with reference to FIG. The optical parameter calculation unit 22 obtains a frequency peak of the spatial frequency by, for example, fast Fourier transform (FFT) in order to detect moire in the captured image signals Sia and Sib. The inclination angles Φa and Φb can be obtained from the frequency peak vector of the spatial frequency, and the moire pitches Λa and Λb can be obtained from the peak frequencies.

  The inclination angles Φa and Φb and the moire pitch Λa and Λb may be obtained by other methods. The measurer may directly check the image and measure the tilt angles Φa and Φb and the moire pitches Λa and Λb.

  In FIG. 4, the straight line 111 drawn by the reference image signal Sva (or the reference image signal Svb) and the lens boundary line 521 of the lenticular lens 52 intersect at an angle of Δθ. The period of the straight line 111 is L. Here, Δθ is drawn large, but the angle formed by the straight line 111 and the lens boundary line 521 is very small. Therefore, the period of the lens boundary line 521 can be approximated by (L + ΔL).

  At this time, a striped line due to moire is generated like an arrow line indicated by a one-dot chain line. The straight line AB is on the moire line. EF is the moiré period Λ. When ∠AEF is ΔΦ, ΔΦ is the inclination angle of the moire with respect to the straight line 111. The moire inclination angle is an angle formed between a direction perpendicular to the moire stripe pattern and a straight line group (straight line 111). If Δθ is small, DB = L × tan ΔΦ = ΔL / Δθ. If ΔL is small, AE = (L + ΔL) / Δθ≈L / Δθ. The EF that is the moiré period Λ is EF = AE × cos ΔΦ = (L / Δθ) × cos ΔΦ.

As described above, the angle error Δθ and the period error ΔL between the straight line 111 and the lens boundary line 521 are expressed by the following formula (1), using the period L of the straight line 111, the moire period Λ, and the moire inclination angle ΔΦ. It can be obtained as in (2). Equations (1) and (2) are in the same order as the compound number.
Δθ = ± (L / Λ) × cos ΔΦ (1)
ΔL = ± (L ² / Λ) × sin ΔΦ (2)

  FIG. 5 shows a case where moire in the same direction occurs in the same cycle as in FIG. 4, although the relationship between the straight line 111 and the lens boundary line 521 is different from that in FIG. When Δθ and ΔL are positive when the relationship between the straight line 111 and the lens boundary line 521 is in the state shown in FIG. 4, as shown in FIG. 5, the straight line 111 and the lens boundary line 521 where Δθ and ΔL are negative, respectively. Relationship exists. Therefore, basically, the angle error Δθ and the period error ΔL cannot be uniquely determined by using only one reference image signal. Therefore, two reference image signals Sva and Svb are used.

  When the captured image signal Sia when the image based on the reference image signal Sva with the inclination angle θa of the straight line group (straight line 111) illustrated in FIG. 2A is 15 ° is input to the optical parameter calculation unit 22, Assume that the tilt angle Φa of the displayed image is measured as + 45 ° as shown in FIG. When the inclination angle ΔΦ of the moire at this time is ΔΦa, ΔΦa = Φa−θa = + 45 ° −15 ° = + 30 °. It is assumed that the moire pitch Λa is measured as 25 mm.

  In addition, a captured image signal Sib obtained when an image based on the reference image signal Svb having an inclination angle θa of 17 ° of the straight line group (straight line 111) illustrated in FIG. 2B is input to the optical parameter calculation unit 22. Assume that the tilt angle Φb of the displayed image is measured as −13 ° as shown in FIG. When the inclination angle ΔΦ of the moire at this time is ΔΦb, ΔΦb = Φb−θb = −13 ° −17 ° = −30 °. It is assumed that the moire pitch Λb is measured as 25 mm.

The optical parameter calculation unit 22 calculates Δθa and ΔLa as follows based on the equations (1) and (2), where L is 0.5 mm, Λa is 25 mm, and ΔΦa is + 30 °.
Δθa = + 1 ° and ΔLa = + 0.005 mm, or Δθa = −1 ° and ΔLa = −0.005 mm (3)

In addition, since Δθ in the equation (1) can be obtained with a unit of radians, it is necessary to convert the unit into degrees. A specific formula for calculating Δθ is as follows.
Δθa = ± (0.5 mm / 25 mm) × cos (30 °)
= ± 0.02 × 0.866
= ± 0.0173 [rad]
≒ 1 [°]

Further, the optical parameter calculation unit 22 calculates Δθb and ΔLb based on the equations (1) and (2) as follows, assuming that L is 0.5 mm, Λb is 25 mm, and ΔΦb is −13 °.
Δθb = + 1 ° and ΔLb = −0.005 mm, or Δθb = −1 ° and ΔLb = + 0.005 mm (4)

  According to the equation (3), the inclination angle of the lenticular lens 52 is 15 ° ± 1, and is therefore 16 ° or 14 °. Further, according to the equation (4), the inclination angle of the lenticular lens 52 is 17 ° ± 1, and is 18 ° or 16 °. Since the inclination angle of the lenticular lens 52 obtained by the equation (3) and the inclination angle of the lenticular lens 52 obtained by the equation (4) must be the same, the inclination angle of the lenticular lens 52 is uniquely 16 °. Can be calculated.

  Since the former is selected in Expression (3) and the latter is selected in Expression (4), the optical parameter calculation unit 22 calculates the lens pitch of the lenticular lens 52 from 0.5 + 0.005 mm to 0.505 mm. be able to.

  As described above, according to the first embodiment, the relative inclination angle of the optical member with respect to the display device can be determined based on the picked-up image signals Sia and Sib including moire without directly imaging the periodic structure of the optical member. The period of the optical member can be measured.

Second Embodiment
In the second embodiment shown in FIG. 6, the same parts as those in FIG. In the first embodiment described above, it has been described that the two reference image signals Sva and Svb are used because the angle error Δθ and the period error ΔL cannot be uniquely determined by using only one reference image signal. However, under specific conditions, the angle error Δθ and the period error ΔL can be determined with only one reference image signal, and the relative inclination angle of the optical member with respect to the display device and the period of the optical member can be measured. It is.

  The relative angle between the display device 51 and the lenticular lens 52 has a predetermined design center, and the design center is, for example, 16 °. It is assumed that the accuracy of attaching the lenticular lens 52 to the display device 51 is compensated to be 16 ° ± 1 °. In the second embodiment, it is necessary to compensate that the accuracy of attaching the lenticular lens 52 to the display device 51 is within a minute predetermined angle.

  In FIG. 6, the reference image creation unit 11 creates and outputs a reference image signal Sv that is a reference image of an inclined straight line group as shown in FIG. 7 based on the control by the control unit 14. As shown in FIG. 7, in the reference image of the straight line group based on the reference image signal Sv, the inclination angle of each straight line 111 is θ and the straight line pitch is L. The inclination angle θ is 14 °, and the linear pitch L is 0.5 mm. Since the accuracy of attaching the lenticular lens 52 to the display device 51 is 16 ° ± 1 °, the inclination angle θ is an angle exceeding the range of 16 ° ± 1 °.

  The reference image signal Sv output from the reference image creation unit 11 is input to the image display drive unit 13. Although the reference image holding unit 12 is omitted in FIG. 6, the reference image holding unit 12 may be provided as in FIG. The image display driving unit 13 drives the directional display device 50 so that the directional display device 50 displays the reference image signal Sv. The control unit 14 supplies an identification signal indicating that the reference image signal Sv is displayed on the directional display device 50 to the control unit 23.

  The display image imaging unit 21 images the entire screen of the directional display device 50 based on control by the control unit 23. In the state where the directional display device 50 displays the reference image signal Sv, the captured image signal Si obtained by capturing the screen by the display image capturing unit 21 is input to the optical parameter calculating unit 22.

  When the control unit 23 inputs the captured image signal Si to the optical parameter calculation unit 22, the control unit 14 completes the imaging of the image by the reference image signal Sv with respect to the control unit 14, and uses the captured image signal Si as the optical parameter calculation unit 22. An end confirmation signal indicating that the data has been transferred to is supplied. In the second embodiment, the operation in which the control unit 23 supplies the end confirmation signal to the control unit 14 can be omitted.

  FIG. 8 shows an example of an image having moire displayed on the screen when the reference image signal Sv is supplied to the directional display device 50. The inclination angle of the moire periodic direction with respect to the vertical direction is Φ, and the moire pitch is Λ. It is assumed that the inclination angle Φ is + 30 ° and the moire pitch Λ is 13.8 mm.

The optical parameter calculation unit 22 calculates Δθ and ΔL based on the equations (1) and (2) as follows, assuming that L is 0.5 mm, Λ is 13.8 mm, and ΔΦ is + 30 °.
Δθ = + 2 ° and ΔL = + 0.005 mm, or Δθ = −2 ° and ΔL = −0.005 mm (5)

  The inclination angle of the lenticular lens 52 is 14 ° ± 2 according to the equation (5), and is therefore 16 ° or 12 °. Since the accuracy of attaching the lenticular lens 52 to the display device 51 is 16 ° ± 1 °, the tilt angle of the lenticular lens 52 can be calculated to be 16 °. The optical parameter calculator 22 can calculate the lens pitch of the lenticular lens 52 as 0.505 mm from 0.5 + 0.005 mm.

  As described above, according to the second embodiment, the relative inclination angle of the optical member with respect to the display device and the optical member are based on the captured image signal Si including moire with a simpler configuration than the first embodiment. The period can be measured.

<Third Embodiment>
In the third embodiment shown in FIG. 9, the same parts as those in FIG. In the first embodiment described above, the reference image signal Sva composed of the reference image of the straight line group having the inclination angle θa and the linear pitch La, and the reference image signal Svb composed of the reference image of the straight line group having the inclination angle θb and the straight line pitch Lb. In the third embodiment, a single reference composed of a composite image including both a straight line group having an inclination angle θa and a linear pitch La and a straight line group having an inclination angle θb and a linear pitch Lb is used in the third embodiment. An image signal is used.

  In FIG. 9, the reference image creating unit 11, based on the control by the control unit 14, displays a region on the left side of the screen as a reference image of a straight line group having an inclination angle θa and a linear pitch La, and a right side of the screen. A reference image signal Svab having the region as a reference image of a straight line group having an inclination angle θb and a straight line pitch Lb is generated and output. Here, the screen is divided into left and right, but may be divided into upper and lower. The positional relationship between the reference image of the straight line group having the inclination angle θa and the straight line pitch La and the reference image of the straight line group having the inclination angle θb and the straight line pitch Lb may be reversed.

  As in the first embodiment, the inclination angle θa is 15 °, the inclination angle θb is 17 °, and the linear pitches La and Lb are 0.5 mm.

  The reference image signal Svab output from the reference image creation unit 11 is input to the image display drive unit 13. 9, the reference image holding unit 12 is omitted, but the reference image holding unit 12 may be provided as in FIG. The image display drive unit 13 drives the directional display device 50 so that the directional display device 50 displays the reference image signal Svab. The control unit 14 supplies an identification signal indicating that the reference image signal Svab is displayed on the directional display device 50 to the control unit 23.

  The display image imaging unit 21 images the entire screen of the directional display device 50 based on control by the control unit 23. In a state where the directional display device 50 displays the reference image signal Svab, the captured image signal Siab captured by the display image capturing unit 21 is input to the captured image holding unit 24 and held.

  FIG. 11 shows an example of an image displayed on the screen when the reference image signal Svab is supplied to the directional display device 50. As shown in FIG. 11, moire with an inclination angle Φa and moire pitch Λa occurs in the left area of the screen, and moire with an inclination angle Φb and moire pitch Λb occurs in the area on the right side of the screen.

  Based on the control by the control unit 23, the captured image holding unit 24 extracts, from the captured image signal Siab, only the signal portion of the left region of the screen where the moire of the inclination angle Φa and the moire pitch Λa is generated. Output as signal Sira. The captured image signal Sira is input to the optical parameter calculation unit 22.

  After the optical parameter calculation unit 22 calculates the optical parameters based on the captured image signal Sira, the captured image holding unit 24, based on the control by the control unit 23, uses the captured image signal Siab to generate a moire having an inclination angle Φb and a moire pitch Λb. Only the signal portion of the right region of the screen where the image is generated is extracted and output as the captured image signal Sirb. The captured image signal Sirb is input to the optical parameter calculation unit 22.

  When the control unit 23 inputs the captured image signals Sira and Sirb to the optical parameter calculation unit 22, the control unit 14 completes the imaging of the image by the reference image signal Svab and optically captures the captured image signals Sira and Sirb. An end confirmation signal indicating the transfer to the parameter calculation unit 22 is supplied. When the captured image signal Siab is held in the captured image holding unit 24, the control unit 23 may supply an end confirmation signal to the control unit 14. Also in the third embodiment, the operation in which the control unit 23 supplies the end confirmation signal to the control unit 14 can be omitted.

  The calculation operation of the tilt angle and the lens pitch of the lenticular lens 52 in the optical parameter calculation unit 22 is exactly the same as in the first embodiment, and the tilt angle of the lenticular lens 52 is calculated as 16 ° and the lens pitch is calculated as 0.505 mm.

  As described above, according to the third embodiment, the accuracy of attaching the lenticular lens 52 to the display device 51 is compensated for by one reference image signal Svab, as in the case of using the two reference image signals Sva and Svb. Without it, the tilt angle and lens pitch of the lenticular lens 52 can be calculated.

  In the third embodiment, when the reference image signal Svab is supplied to the directional display device 50, the entire image displayed on the screen is captured to obtain a captured image signal Siab that is an image including two types of moire. Thus, the captured image signal Siab is divided into captured image signals Sira and Sirb. This is just an example and may be as follows.

  First, when the display image capturing unit 21 supplies the reference image signal Svab to the directional display device 50, the display image capturing unit 21 captures only the left region of the image displayed on the screen, and the captured image signal of the left region is the optical parameter. The calculation unit 22 is input to calculate the optical parameters. Thereafter, when the display image capturing unit 21 supplies the reference image signal Svab to the directional display device 50, the display image capturing unit 21 captures only the right region of the image displayed on the screen, and optically captures the captured image signal of the right region. The parameter is calculated by inputting the parameter to the parameter calculator 22. In this way, the display image capturing unit 21 may capture the image displayed on the screen in two steps. In this case, the captured image holding unit 24 can be omitted.

<Fourth embodiment>
In the fourth embodiment shown in FIG. 12, the same parts as those in FIG. The fourth embodiment is a directional display device that correctly displays an image based on optical parameters (tilt angle and lens pitch of the lenticular lens 52) obtained by the optical parameter measurement device even if the optical parameters are not appropriate. .

  The fourth embodiment shown in FIG. 12 includes the optical parameter measurement device of the first embodiment. In FIG. 12, a switch 15 is provided between the reference image holding unit 12 and the image display driving unit 13. When measuring the optical parameter of the directional display device 50 by the optical parameter measuring device, the control unit 14 connects the switch 15 to the terminal ta. When the switch 15 is connected to the terminal ta, the optical parameter measurement device calculates the tilt angle and the period of the lenticular lens 52 as described in the first embodiment.

  An image signal displayed on the directional display device 50 is input to the pixel data array unit 31. In the fourth embodiment, it is assumed that the image signals are nine different image signals as an example. The nine image signals are, for example, multi-viewpoint image signals that are nine-viewpoint parallax images for displaying a stereoscopic image on the directional display device 50. A case where the image signal input to the pixel data array unit 31 is a multi-view image signal of nine viewpoints will be described as an example.

  When displaying the nine-view multi-view image signal on the directional display device 50, it is necessary to display the nine-view multi-view image signal on the pixel of the display device 51 assigned to each parallax image. The pixel data array unit 31 includes a table 32 that associates with which pixel of the display device 51 each of the nine viewpoint multi-viewpoint image signals is displayed. In the table 32, association data is preliminarily set on the assumption that the directional display device 50 is manufactured in accordance with the predetermined design center of the inclination angle and period of the lenticular lens 52.

  However, if any one of the inclination angle and the period of the lenticular lens 52 is deviated from the design center, using the design center association data set in the table 32, the multi-viewpoint image signal of the viewpoint is displayed as a directivity display. It cannot be displayed correctly on the device 50. Therefore, the fourth embodiment is configured as follows.

  Information indicating the tilt angle and period of the lenticular lens 52 calculated by the optical parameter calculation unit 22 is input to the table update unit 33. The table updating unit 33 updates the association data set in the table 32 based on information indicating the tilt angle and the period of the lenticular lens 52.

  Here, a table creation method will be described. The pixel position of the display device 51 is set to (X, Y) with the upper left corner as the origin. X and Y are integers. The pixel pitch in the horizontal direction is px, and the pixel pitch in the vertical direction is py. The tilt angle of the lenticular lens 52 is ψ, and the period (lens pitch) is P. The tilt angle ψ of the lenticular lens 52 is the tilt angle of the lens boundary line 521 with respect to the vertical direction of the display device 51. The lens pitch P is an interval between the lens boundary lines 521.

The distance ΔP (X, Y) between each pixel of the display device 51 and the lens boundary line 521 of the lenticular lens 52 adjacent to the left side of each pixel can be calculated by the following equation (6), for example. The inclination angle ψ and the lens pitch P in Expression (6) are values calculated by the optical parameter calculation unit 22. N is an integer satisfying 0 ≦ ΔP <P.
ΔP (X, Y) = X × px × cos ψ + Y × py × sin ψ−N × P (6)

From ΔP (X, Y), the number TBL (X, Y) of the multi-viewpoint image signal to be displayed by the pixel at the pixel position (X, Y) is determined by the following equation (7). The number of the multi-viewpoint image signal is, for example, 0 to 8 in the case of 9 viewpoints. The floor (α) indicates an integer obtained by rounding down the decimal point of α. TBL (X, Y) is any integer from 0 to 8.
TBL (X, Y) = floor (9 × ΔP (X, Y) / P) (7)

  The table updating unit 33 applies the pixel data of each of the nine viewpoint multi-viewpoint image signals to all the pixels of the display device 51 according to the equations (6) and (7). The table 32 is updated by creating a new table for associating whether or not to display.

  The pixel data array unit 31 refers to the updated table 32, sets the pixel data of each of the nine viewpoint multi-viewpoint image signals, the position (X, Y) of each pixel set in the table 32, and The multi-viewpoint image signal number TBL (X, Y) at the position (X, Y) is arranged so as to coincide with the corresponding relationship.

  When the image signal input to the pixel data array unit 31 is displayed on the directional display device 50, the control unit 14 connects the switch 15 to the terminal tb. Pixel data arranged by the pixel data arrangement unit 31 is supplied to the image display driving unit 13 and displayed on the directional display device 50.

  As described above, according to the fourth embodiment, the accuracy of attaching the lenticular lens 52 to the display device 51 is poor, and even when there is an error in the relative position between the display device 51 and the lenticular lens 52, an image is displayed correctly. Can be made. Even when the relative position between the display device 51 and the lenticular lens 52 changes due to an external factor such as the expansion of the lenticular lens 52 due to a temperature change, the image can be displayed correctly.

  In order to achieve the former effect, for example, the inclination angle and period of the lenticular lens 52 are calculated before the image signal is displayed on the directional display device 50 for the first time, and the inclination angle and period of the lenticular lens 52 are calculated at least once. In order to achieve the latter effect, for example, each time an image signal is displayed on the directional display device 50, the tilt angle and period of the lenticular lens 52 are calculated, or the tilt angle of the lenticular lens 52 is appropriately set. What is necessary is just to calculate a period.

  In the fourth embodiment shown in FIG. 12, the configuration including the optical parameter measurement device of the first embodiment is shown, but the configuration may include the optical parameter measurement device of the second or third embodiment.

  The present invention is not limited to the first to fourth embodiments described above, and various modifications can be made without departing from the scope of the present invention. The optical member is not limited to a lenticular lens. In the first to fourth embodiments, the two control units 14 and 23 are used, but one control unit may be used. Further, two control units may be sub-control units and a main control unit that controls the two control units may be provided. The reference image creation unit 11 may be a reproduction unit that simply reproduces a reference image signal created in advance. The image signal displayed on the directional display device is not limited to the multi-viewpoint image signal.

DESCRIPTION OF SYMBOLS 11 Reference image creation part 12 Reference image holding part 13 Image display drive part 14,23 Control part 15 Switch 21 Display image imaging part 22 Optical parameter calculation part 24 Captured image holding part 31 Pixel data arrangement | positioning part 32 Table 33 Table update part 50 Orientation Display device 51 display device 52 optical member

Claims (8)

Displayed on a directional display device having a structure in which an optical member having a periodic structure of a plurality of optical elements is fixed in a one-dimensional manner on a screen of a display device in which pixels are arrayed in two dimensions. A reference image creating unit that creates a reference image signal composed of first and second reference images of two types of straight line groups different from each other;
A display image capturing unit that captures the screen in a state where the first and second reference images are displayed individually or simultaneously on the display device based on the reference image signal;
Included in the period of the straight line group of the first reference image and the first captured image signal obtained by capturing the screen in a state where the display image capturing unit displays the first reference image on the display device. The inclination angle and period of the first moire, which is an angle formed between a direction perpendicular to the stripe pattern line of the first moire and the straight line group of the first reference image, and the second reference image The period of the straight line group and the second moire stripe pattern included in the second captured image signal obtained by capturing the screen in a state where the display image capturing unit displays the second reference image on the display device. The relative angle of the optical member with respect to the display device using the inclination angle and period of the second moire, which is an angle formed by a direction orthogonal to the line of the second reference image and a straight line group of the second reference image. Light for calculating the inclination angle and the period of the optical member And a parameter calculation unit,
An optical parameter measuring device comprising: The reference image creation unit creates a first reference image signal composed of the first image and a second reference image signal composed of the second image,
The display image capturing unit is configured to display the first image on the display device based on the first reference image signal, and to display the second image on the display device based on the second reference image signal. The optical parameter measurement device according to claim 1, wherein the screen is individually captured in a state where the image of the image is displayed. The reference image creating unit creates a reference image signal composed of a composite image including a first region composed of the first image and a second region composed of the second image;
The display image capturing unit captures the screen in a state where the composite image is displayed on the display device by the reference image signal so as to include the first and second regions,
The optical parameter calculation unit extracts a signal portion corresponding to the first region included in a captured image signal obtained by imaging the screen as the first captured image signal, and converts the signal portion into a captured image signal obtained by imaging the screen. The optical parameter measurement device according to claim 1, wherein a signal portion corresponding to the second region included is extracted and used as the second captured image signal. The optical parameter calculation unit has a period of the first or second reference image as L, a period of the first or second moire as Λ, and an inclination angle of the first or second moire as ΔΦ. The angle between the straight line group of the first or second reference image and the boundary line of the adjacent optical element in the plurality of optical elements based on the following formulas (1) and (2) that are in the same order as the compound code An error Δθ and a period error ΔL are obtained,
Δθ = ± (L / Λ) × cos ΔΦ (1)
ΔL = ± (L ² / Λ) × sin ΔΦ (2)
Based on the four types of angle error Δθ and period error ΔL obtained from the equations (1) and (2), the relative inclination angle of the optical member with respect to the display device and the period of the optical member are calculated. The optical parameter measurement device according to claim 1, wherein the optical parameter measurement device is a device. It has a structure in which an optical member having a periodic structure of a plurality of optical elements is fixed in a one-dimensional manner on a screen of a display device in which pixels are arranged in two dimensions, and the mounting accuracy of the optical member to the display device is predetermined. A reference image creating unit that creates a reference image signal composed of a reference image of a group of straight lines in which inclined straight lines are arranged at a predetermined period, which is displayed on a directional display device that is compensated for within an angle;
A display image capturing unit that captures the screen in a state where the reference image is displayed on the display device by the reference image signal;
For the period of the straight line group of the reference image and the moire stripe pattern lines included in the captured image signal obtained by capturing the screen in a state where the display image is displayed on the display device by the display image capturing unit. The relative inclination angle of the optical member with respect to the display device and the period of the optical member are calculated using the inclination angle and period of the moire, which is an angle formed by the orthogonal direction and the straight line group of the reference image. An optical parameter calculation unit to perform,
An optical parameter measuring device comprising: A directional display device having a structure in which an optical member having a periodic structure of a plurality of optical elements is fixed in a one-dimensional manner on a screen of a display device in which pixels are arrayed in two dimensions. Supplying a reference image signal composed of first and second reference images of two different types of straight line groups, and displaying the first and second reference images on the screen;
Imaging the screen in a state where the first and second reference images are displayed individually or simultaneously on the screen;
The period of the straight line group of the first reference image, and the first moire stripe pattern included in the first captured image signal obtained by capturing the screen in a state where the first reference image is displayed on the screen. The inclination angle and period of the first moire, which is an angle formed by a direction perpendicular to the line and the straight line group of the first reference image, the period of the straight line group of the second reference image, The second reference and a direction orthogonal to a second moire stripe pattern line included in a second captured image signal obtained by imaging the screen in a state where the second reference image is displayed on the screen. Calculating the relative inclination angle of the optical member with respect to the display device and the period of the optical member using the inclination angle and period of the second moire, which is an angle formed by a straight line group of the image. A characteristic optical parameter measuring method. It has a structure in which an optical member having a periodic structure of a plurality of optical elements is fixed in a one-dimensional manner on a screen of a display device in which pixels are arranged in two dimensions, and the mounting accuracy of the optical member to the display device is predetermined. A directional display device that is compensated to be within an angle displays a reference image signal composed of a reference image of a straight line group in which inclined straight lines are arranged at a predetermined period,
Capture the screen in a state where the reference image is displayed on the screen,
The period of the straight line group of the reference image, the direction orthogonal to the moire stripe pattern line included in the captured image signal obtained by imaging the screen in a state where the reference image is displayed on the screen, and the reference image The relative tilt angle of the optical member with respect to the display device and the cycle of the optical member are calculated using the tilt angle and cycle of the moire, which is an angle formed by the straight line group. Parameter measurement method. When displaying a plurality of image signals on a directional display device having a structure in which an optical member having a periodic structure of a plurality of optical elements is fixed in a one-dimensional manner on a screen of a display device in which pixels are arrayed in two dimensions. With reference to a table for setting a correspondence relationship on which pixel in the display device the pixel data of each of the plurality of image signals is displayed, a pixel data arrangement unit that arranges the pixel data of each of the plurality of image signals;
A table updating unit that updates information set in the table based on a relative inclination angle of the optical member with respect to the display device and a period of the optical member;
A directional display device comprising:

Images