JP4995672B2 - Stereoscopic image display device and method of creating stereoscopic image display - Google Patents

Description

The present invention relates to a stereoscopic image display device using a large number of lenticular lenses and a method for creating a stereoscopic image display body .

  So-called changing is known in which an image that can be observed by an observer is changed by changing the observation direction using a lenticular lens. In addition, there is known a stereoscopic image display device that enables observation of a stereoscopic image by observing an image using a lenticular lens.

  A stereoscopic image display device superimposes a display surface of a printed photograph or a display device on a back surface of a lenticular sheet in which a large number of kamaboko-shaped lenticular lenses are arranged. On this display surface, an image area provided for each lenticular lens is divided into, for example, two minute areas corresponding to two left and right viewpoints, and each image photographed from the two viewpoints is linearly (striped). The divided linear images are recorded alternately or displayed. As a result, the left eye and the right eye each observe a linear image with parallax via each lenticular lens, so that a stereoscopic image can be observed.

  Further, N images are taken from N viewpoints of three or more viewpoints and divided into lines, and the image area is divided into N minute areas corresponding to the N viewpoints to correspond to the minute areas. There is known a stereoscopic image display device capable of displaying a stereoscopic image having a better stereoscopic effect by recording or displaying a linear image of a viewpoint.

Furthermore, a large number of lenticular lenses are arranged at a constant pitch, but when observing a linear image with parallax from the observation point through these lenticular lenses, a shift occurs in the pitch of the position of the observed image. A technique for arranging a linear image so as to correspond to this pitch shift is known from Patent Document 1.
Japanese Patent Laid-Open No. 07-77668

  By the way, in the multi-viewpoint, a preferable stereoscopic image can be displayed by arranging the images of the corresponding viewpoints with respect to the micro-viewpoints obtained by dividing the image area into N viewpoints, for example, corresponding to N viewpoints. However, in one stereoscopic image display device, only one stereoscopic image is displayed, and the image can be switched by changing, but the image is a flat image and the stereoscopic image is not switched. could not.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for creating a stereoscopic image display body and a stereoscopic image display device capable of displaying different stereoscopic images by changing the observation position.

In order to achieve the above object, in the method for producing a stereoscopic image display body according to claim 1, the image area defined for each of the lenticular lenses on the focal plane of the lenticular lens is divided into three or more linear micro areas. a dividing step of dividing direction, to overlap a portion of each observation area on the lenticular sheet is observed from the observation point, and for each minute region to be observed through the lenticular lens by the left and right eyes of each observation point At least the first observation point and the second observation point that are determined in advance so as not to overlap in the same image area should be observed at the first stereoscopic image and the second observation point that should be observed at the first observation point. A step of linearizing each left eye and right eye parallax image for the second stereoscopic image into a plurality of linear images, and a wrench from the first observation point A linear image for the left eye of the first stereoscopic image is arranged in a minute area observed by the left eye through the cellular lens, and a linear image for the right eye of the first stereoscopic image is arranged in the minute area observed by the right eye. The linear image for the left eye of the second stereoscopic image is displayed on the minute area observed with the left eye from the second observation point through the lenticular lens, and the right eye of the second stereoscopic image is displayed on the minute area observed with the right eye. And an arrangement step for arranging each of the linear images.

  In the method for creating a stereoscopic image display body, N images from three or more N viewpoints are used as each image having a parallax for the left eye and the right eye for each stereoscopic image. The image is divided into N minute regions corresponding to the respective viewpoints, and in the linearization step, each of the N images for each observation point is divided into linear images to form linear images. In each minute region observed from one observation point, among the images with parallax for the first stereoscopic image, a linear image of the image with parallax corresponding to the viewpoint corresponding to the minute region is arranged. In each minute region observed from two observation points, a linear image of an image with parallax corresponding to the viewpoint corresponding to the minute region among images with parallax for the second stereoscopic image is arranged. is there.

  In the method for creating a stereoscopic image display body according to claim 3, N is set to 6 or more. In the method for producing a stereoscopic image display body according to claim 4, the interval between the first observation point and the second observation point is set within a range of 40% to 100% of the observation distance.

6. The stereoscopic image display device according to claim 5, wherein three or more minute regions divided in the left-right direction are provided in each image region partitioned corresponding to each of the lenticular lenses and observed from each observation point. A part of each observation range on the sheet is overlapped, and the position of each minute area observed through the lenticular lens by the left eye and the right eye of each observation point is determined in advance so as not to overlap in the same image area. for at least a first observation point and the second observation point, fine that the linear images for the left eye of the first stereoscopic image in a minute area observed by the left eye through the lenticular lens from the first observation point, is observed by the right eye linear images for the right eye of the first stereoscopic image coordinated in a region, the linear images for the left eye of the second stereoscopic image from the second observation point to small area to be observed by the left eye through the lenticular lens, right Observe with eyes In the micro area in which the linear images for the right eye of the second stereoscopic image including the stereoscopic image display arrangement.

  According to the present invention, the observation points are determined so that the minute regions in the image areas defined for each of the lenticular lenses observed by the left eye and the right eye of each observation point do not overlap, and are observed respectively. Since a corresponding one of the linear images obtained by dividing the left-eye and right-eye parallax images for the first stereoscopic image and the second stereoscopic image into linear segments is arranged in the minute area, each observation Different stereoscopic images can be observed from the point.

  FIG. 1 shows a lenticular print 2 as a stereoscopic image display apparatus embodying the present invention. The lenticular print 2 includes a lenticular sheet 3 and a printed photograph 4 as an image display body. In this lenticular print 2, two different first and second observation points Ob1, Ob2 (see FIG. 4) are set so that the first stereoscopic image P1 can be observed from the first observation point Ob1. The second stereoscopic image P2 different from the first stereoscopic image P1 can be observed from the second observation point Ob2.

  As is well known, the lenticular sheet 3 has a large number of semi-cylindrical lenticular lenses 3a arranged in the left-right direction (arrow LR direction). In this lenticular sheet 3, for example, Qn lenticular lenses 3a are arranged at 100 LPI (Line Per Inch), that is, with a pitch of 254 μm.

The printed photograph 4 has a linear image necessary for observing the first stereoscopic image P1 and the second stereoscopic image P2 from the observation point recorded on the recording surface 4a, and the recording surface 4a is the focal plane of the lenticular lens 3a. In such a manner, the lenticular sheet 3 is adhered in close contact with the back surface.

  As shown in FIG. 2, the recording surface 4a of the printed photograph 4 is divided into Qn image areas 7 corresponding to the lenticular lens 3a, and the one lenticular lens 3a is behind the recording surface 4a. Each image region 7 corresponds. Each image region 7 has the same size as the back surface of the lenticular lens 3a, is long in the vertical direction, and has a linear shape (stripe shape) having the same width (length in the left-right direction) as the width of the lenticular lens 3a. .

  Each image area 7 is further divided in the width direction to provide the same number of minute areas as the number of images with parallax (hereinafter referred to as parallax images) for displaying a stereoscopic image, that is, the number of viewpoints. The number of viewpoints may be three viewpoints or more. In this example, as six viewpoints, parallax images for six viewpoints are used to display one stereoscopic image, and each image region 7 is displayed from the right side. In order, it is divided into an A minute region 7a, a B minute region 7b,..., An F minute region 7f. As will be described in detail later, linear images obtained by dividing parallax images into linear shapes are recorded in the A to F minute regions 7a to 7f.

  FIG. 3 shows an example of a creation apparatus. The image input unit 11 outputs a parallax image, and is composed of, for example, six cameras 11a to 11f arranged side by side at an appropriate interval in the left-right direction. Each of the cameras 11a to 11f has a stereoscopic image. The subject to be displayed is photographed, and the obtained images are output as parallax images. The parallax images are output for each of the first stereoscopic image and the second stereoscopic image, and the parallax images P1A to P1F for the first stereoscopic image P1 and the parallax images P2A to P2F for the second stereoscopic image P2 are image processing unit 12. Send to each. Note that the image input unit 11 may be configured by a computer or the like that generates and outputs a parallax image.

  For example, the parallax image P1A is an image from the A viewpoint taken by the leftmost camera 11a, and corresponds to the rightmost A minute region 7a in the image region 7 when viewed from the observation point side. The image from the B viewpoint on the right side of the A viewpoint is the parallax image P1B, and corresponds to the B minute area 7b on the left side of the A minute area 7a. Similarly, the viewpoint is shifted in the right direction from the C viewpoint to the F viewpoint, and images from these viewpoints become a parallax image P1C, a parallax image P1D, a parallax image P1E, and a parallax image P1F, respectively, and a C minute region 7c. , D minute region 7d, E minute region 7e, and F minute region 7f. The same applies to the relationship between the parallax images P2A to P2F and the viewpoint, and the parallax images P2A to P2F correspond to the A to F minute regions 7a to 7f.

  The image processing unit 12 divides each of the parallax images P1A to P1F and the parallax images P2A to P2F into a linear shape so as to correspond to the image area 7, and further compresses the parallax images P1A to P1F and P2A to P2F in the horizontal direction. , And an image (hereinafter referred to as an array image) in which the linear image is arranged in a printed photograph 4 as will be described in detail later is created.

  In the parallax image division, since the number of lenticular lenses 3a, that is, the number of image areas 7, is Qn, the parallax images P1A to P1F and the parallax images P2A to P2F are Qn linear images, respectively. Note that the parallax image creation method, the correspondence between the parallax image and the minute area, the linear image creation method, and the like may be the same as those in the case of displaying a stereoscopic image using a multi-view parallax image. it can.

  The memory unit 13 is used as a work memory that temporarily stores data such as parallax images P1A to P1F, parallax images P2A to P2F, created linear images, and data during work. The output unit 14 records the array image created by the image processing unit 12 on a recording medium, creates a printed photograph 4, and the lenticular sheet 3 is accurately positioned and pasted on the printed photograph 4 to lenticular print 2. And

  As described above, the first observation point Ob1 and the second observation point Ob2 are predetermined for the lenticular print 2. As shown in FIG. 4A, the first observation point Ob1 and the second observation point Ob2 are set at a distance d2 from the lenticular print 2 having the width d1. The first observation point Ob1 and the second observation point Ob2 are separated by an interval (a distance between the centers of the left eye and the right eye of each observation point) d3. When the eye width d4 of the observer of the stereoscopic image is set, the interval d3 is larger than the eye width d4, but the observation ranges of the first observation point Ob1 and the second observation point Ob2 are mutually on the lenticular print 2. Some overlap. In the same image region 7 in the overlapping observation range, the minute regions observed by the left eye and the right eye of the observation points Ob1 and Ob2 do not overlap each other. The interval d3 is preferably in the range of 40% to 100% of the distance d2 between the lenticular print 2 and the observation point.

  When creating an array image, a linear image for the left eye of the first stereoscopic image P1 is placed on the right side in a minute region observed with the left eye when observing through the lenticular lens 3a at the first observation point Ob1. In the minute region observed by the eye, a linear image for the right eye of the first stereoscopic image P1 is arranged, and the minute region observed by the left eye when observing through the lenticular lens 3a at the second observation point Ob2. In addition, a linear image for the left eye of the second stereoscopic image P2 is arranged, and a linear image for the right eye of the second stereoscopic image P2 is arranged in a minute region observed by the right eye.

  In this example, since the parallax images for six viewpoints are used for the left eye and the right eye, the first three-dimensional object is observed from the first observation point Ob1 to the minute region observed with the left eye or the right eye through the lenticular lens 3a. Among the parallax images P1A to P1F of the image P1, a linear image of the parallax image corresponding to the minute area is arranged as a linear image for the left eye or the right eye. In addition, a parallax image corresponding to the micro area among the parallax images P2A to P2F of the second stereoscopic image P2 is applied to the micro area observed with the left eye or the right eye from the second observation point Ob2 through the lenticular lens 3a. A linear image is arranged as a linear image for the left eye or right eye.

  Therefore, for example, when observed from the first observation point Ob1, the C minute region 7c of the i-th image region 7 corresponding to the lenticular lens 3a is passed through the i-th lenticular lens 3a from the right end with the left eye or the right eye. When observed, the i-th linear image from the right end obtained from the parallax image P1C of the C viewpoint corresponding to the C minute region 7c is arranged in the C minute region 7c.

  Further, when observed at the second observation point Ob2, the D minute region 7d of the jth image region 7 corresponding to the lenticular lens 3a is observed with the left eye or the right eye through the jth lenticular lens 3a from the right end. In this case, the jth linear image from the right end obtained from the parallax image P2d of the D viewpoint corresponding to the D minute area 7d is arranged in the D minute area 7d.

  Even if a linear image is arranged in this way, the image area 7 is divided into minute areas and the observation points Ob1 and Ob2 are determined as described above, so that different linear images overlap in the same minute area. It is never arranged.

  FIG. 4B shows an example of a specific relationship between the position of the lenticular print 2 and the minute area observed by the left eye and the right eye at the observation points Ob1 and Ob2. FIG. 4B shows a minute region observed with the right eye at the first observation point Ob1 when the width d1 is 300 mm, the distance d2 is 200 mm, the distance d3 is 95 mm, and the eye width d4 is 66 mm. In the column, the micro area observed with the left eye is in the P1L column, the micro area observed with the right eye of the second observation point Ob2 is in the P2R column, and the micro area observed with the left eye is in the P2L column. In the column, symbols A to F corresponding to the minute regions are shown.

  Further, in the lenticular sheet 3 used in this example, the pitch of the lenticular lens 3a is 254 μm (100 LPI), the width of the image region 7 is 254 μm, and the width of each of the minute regions 7a to 7f is about 42.3 μm. Further, the refractive index of the lenticular lens 3a is set to 1.65, and the radius of curvature is substantially the same as the pitch of the arrangement of the lenticular lenses.

  For example, through the Q1 lenticular lens 3a from the right end, the image is observed only by the left eye and the right eye at the first observation point Ob1. At this time, the B minute region 7b in the Q1th image region 7 is observed by the right eye, and the A minute region 7a in the Q1th image region 7 is observed by the left eye.

  Therefore, for the Q1th image region 7, as shown in FIG. 5A, the A minute region 7a is a linear shape obtained by dividing the parallax image P1A of the first stereoscopic image P1 corresponding to the A minute region 7a. Of the images, the Q1th linear image P1AQ1 is arranged in the A minute area 7a, and the B minute area 7b is a linear image obtained by dividing the parallax image P1B of the first stereoscopic image P1 corresponding to the B minute area 7b. Among these, the Q1-th linear image P1BQ1 is arranged.

  Further, through the Q2nd lenticular lens 3a, images are observed by the left eye and the right eye at the first observation point Ob1, and the left eye and the right eye at the second observation point Ob2. At the first observation point Ob1, the F minute region 7f in the Q2th image region 7 is observed by the right eye, and the D minute region 7d in the Q2nd image region 7 is observed by the left eye. On the other hand, at the second observation point Ob2, the B minute region 7b in the Q2th image region 7 is observed by the right eye, and the A minute region 7a in the Q2nd image region 7 is observed by the left eye.

  Accordingly, as shown in FIG. 5B, the Q2th image region 7 is the Q2th linear shape among the linear images obtained by dividing the parallax image P2A of the second stereoscopic image P2 into the A minute region 7a. An image P2AQ2 is arranged, and the Q2th linear image among the linear images obtained by dividing the parallax image P2B of the second stereoscopic image P2 into the B minute region 7b is arranged in P2BQ2, and the first stereoscopic image P1 is arranged in the D minute region 7d. Among the linear images obtained by dividing the parallax image P1D, the Q2th linear image P2DQ2 is arranged, and the Q2th linear image among the linear images obtained by dividing the parallax image P1F of the first stereoscopic image P1 in the F minute region 7f. The image P1FQ2 is arranged.

  Similarly, through the Q-th lenticular lens 3a, the left eye of the first observation point Ob1, the left eye and the right eye of the second observation point Ob2, respectively, observe the image, and the left of the first observation point Ob1. The eye observes the E minute area 7e in the Q3th image area 7, the right eye of the second observation point Ob2 is the D minute area 7d in the Q3th image area 7, and the left eye is the Q3th image area 7 The B minute region 7b inside is observed.

  Therefore, as shown in FIG. 5C, for the Q3th image region 7, the Q3th linear image P2BQ3 of the parallax image P2B of the second stereoscopic image P2 is arranged in the B minute region 7b, and the D minute The Q3th linear image P2DQ3 of the parallax image P2D of the second stereoscopic image P2 is arranged in the region 7d, and the Q3th linear image P1EQ3 of the parallax image P1E of the first stereoscopic image P1 is arranged in the E minute region 7e.

  Further, through the Q4th lenticular lens 3a, the image is observed only by the left eye and the right eye of the second observation point Ob2, and the right eye of the second observation point Ob2 is F minute in the Q4th image region 7. In the region 7f, the D minute region 7d in the Q4th image region 7 is observed by the left eye. Therefore, as shown in FIG. 5D, for the Q4th image area 7, the Q4th linear image P2DQ4 of the parallax image P2D of the second stereoscopic image P2 is arranged in the D minute area 7d, and the F minute The Q4th linear image P2FQ4 of the parallax image P2F of the second stereoscopic image P2 is arranged in the region 7f.

As shown in FIG. 6, for example, the lenticular lens 3a is a cylindrical lens having a radius of curvature r and a refractive index n, and a minute region at a distance d from the optical axis P of the lenticular lens 3a is observed on the focal plane of the lenticular lens 3a. Assuming that the direction (angle with respect to the optical axis P) is θ, the direction θ can be obtained by the following equation (1).
θ = sin ⁻¹ (n · d / r) −sin ⁻¹ (d / r) (1)

If light emitted from a minute region at a distance d in a direction parallel to the optical axis P enters the boundary surface between the lenticular lens 13a and air at an incident angle α, the light is refracted at the boundary surface (α + θ). ). Therefore, the following equation (2) is established. The distance d can be expressed by the following formula (3) using the incident angle α.
n · sin α = sin (α + θ) (2)
d = r · sin α (3)

  The above formula (1) is obtained by the above formulas (2) and (3). Since the radius of curvature r and the refractive index n in Equation (1) are values determined by the lenticular lens 3a, an arbitrary distance d, that is, the direction θ for each minute region can be obtained from Equation (1). Each observation point is set so as to satisfy the above-described conditions, and it is possible to determine which linear image should be arranged in each minute region.

  According to the lenticular print 2 configured as described above, when the lenticular print 2 from the first observation point Ob1 is observed, the left eye and the right eye use the linear images of the first stereoscopic image P1 as the respective lenticular lenses. In order to observe through 3a, the three-dimensional first stereoscopic image P1 is observed. When the observation point is moved from the first observation point Ob1 to the second observation point Ob2 and the lenticular print 2 is observed, the left eye and the right eye observe the parallax image of the second stereoscopic image P2 through each lenticular lens 3a. Therefore, the second stereoscopic image P2 having a stereoscopic effect is observed. In addition, since a stereoscopic image can be observed using a multi-viewpoint parallax image, a stereoscopic image having a preferable stereoscopic effect can be observed from any observation point.

  In the above embodiment, two different stereoscopic images can be observed with two observation points. However, three or more different three-dimensional images may be observed with three or more observation points. . Further, in the above embodiment, the printed photograph 4 on which the array image is recorded is brought into close contact with the back surface of the lenticular sheet 3, but the image may be directly recorded on the back surface of the lenticular sheet 3 and the lenticular sheet 3 itself may be used as an image display. . Furthermore, a liquid crystal display or the like may be used as the image display body.

  The number of divisions of the image area, that is, the number of minute areas in the image area, and the number of parallax images, that is, the number of viewpoints do not necessarily have to match. For example, as in the above embodiment, the number of divisions of the image area may be “6” and the number of viewpoints may be “2”. In consideration of observing a stereoscopic image having a preferable stereoscopic effect, the number of viewpoints should be 6 viewpoints or more.

It is a perspective view which shows the external appearance of the lenticular print which implemented this invention. It is explanatory drawing which shows the correspondence of an image area | region, a micro area | region, and a lenticular lens. It is a block diagram which shows an example of a structure of the production apparatus which produces a lenticular print. It is explanatory drawing which shows the relationship between a lenticular print and each observation point, and the relationship of the micro area | region observed. It is explanatory drawing which shows the linear image recorded on the micro area | region corresponding to the Q1-Q4th lenticular lens shown in FIG. It is explanatory drawing which shows the relationship between the direction to observe and the micro area | region observed through a lenticular lens.

Explanation of symbols

2 Lenticular print 3 Lenticular sheet 3a Lenticular lens 7 Image area 7a-7f Micro area Ob1, Ob2 Observation point

Claims (5)

In a method of creating a stereoscopic image display body that stereoscopically displays an image through a lenticular sheet in which a plurality of lenticular lenses are arranged,
A dividing step of dividing the image area partitioned for each of the lenticular lenses on the focal plane of the lenticular lens into three or more linear minute areas in the left-right direction;
With overlapping part of each observation area on the lenticular sheet is observed from the observation point, and the position of each micro area is the same in the image region to be observed through the lenticular lens by the left and right eyes of each observation point Each of the first stereoscopic image to be observed at the first observation point and the second stereoscopic image to be observed at the second observation point with respect to at least the first observation point and the second observation point determined in advance so as not to overlap. A linearization step of dividing each image with parallax for left eye and right eye into a plurality of linear images by dividing each image into linear shapes;
A linear image for the left eye of the first stereoscopic image is observed in the minute area observed with the left eye from the first observation point through the lenticular lens, and a line for the right eye of the first stereoscopic image is observed in the minute area observed with the right eye. A linear image for the left eye of the second stereoscopic image in a minute area observed by the left eye from the second observation point through the lenticular lens, and a second stereoscopic image in the minute area observed by the right eye. A method for producing a stereoscopic image display body , comprising: an arrangement step of arranging a linear image for the right eye of an image. As each image having parallax for the left eye and the right eye for each stereoscopic image, N images from three or more N viewpoints are used, and in the division step, N images in which each image area is associated with each viewpoint. In the linearization step, each of the N images for each observation point is divided into a linear image in the linearization step. In the arrangement step, the image is observed from the first observation point. In each minute area, a linear image of an image with parallax corresponding to the viewpoint corresponding to the minute area among images with parallax for the first stereoscopic image is arranged and observed from the second observation point. 2. A linear image of an image having a parallax corresponding to a viewpoint corresponding to the minute area among images having a parallax for the second stereoscopic image is arranged in each minute area. how to create the three-dimensional image display according. 3. The method for creating a stereoscopic image display body according to claim 2, wherein the N is 6 or more. The first observation point and the distance of the second observation point, how to create according to claim 2, wherein the stereoscopic image display characterized by being in the range of 40% to 100% of the viewing distance. In a stereoscopic image display device that stereoscopically displays an image by observing each linear image obtained by dividing a parallax image into a linear shape through a lenticular sheet in which a plurality of lenticular lenses are arranged side by side,
In each image area divided corresponding to each lenticular lens, three or more minute areas divided in the left-right direction are provided, and a part of each observation range on the lenticular sheet observed from each observation point overlaps And at least the first observation point and the second observation point that are determined in advance so that the positions of the minute regions observed through the lenticular lens by the left eye and the right eye of each observation point do not overlap in the same image region. , the linear images for the left eye of the first stereoscopic image in a minute area observed by the left eye through the lenticular lens from the first observation point, for the right eye of the first stereoscopic image in a minute area observed by the right eye coordinated linear images, the linear images for the left eye of the second stereoscopic image from the second observation point to small area to be observed by the left eye through the lenticular lens, the second solid in the small area to be observed by the right eye For the right eye of the image Stereoscopic image display apparatus comprising the stereoscopic image display body in which arrangement the linear images.

Images