JPH10319345A - Lenticular display body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an observer to visually sense all the picture elements from a cylindrical lens on a proper condition so as to observe a distinct image by constituting a composed image of digitally processed print output and making a lenticular sheet have shape satisfying a specified condition. SOLUTION: Plural images having parallax are the composed images arranged to be on an identical plane in linear picture element units in accordance with the characteristic of the lenticular sheet provided concurrently with the cylindrical lens, and the composed image on the lenticular display body is the print output of the digitally processed image. The lenticular sheet has the shape satisfying the condition of an expression. In the expression, P1 is the pitch of the cylindrical lens, (t) is the length of the lenticular sheet, R is the curvature of the cylindrical lens, αis the blotting amount of the image, D0 is an observing distance, (e) is an eye-to-eye distance, N is the number of images (the number of original picture of the parallax image), Pg is the pitch of one picture element, (n) is the refractive index of the lenticular sheet, and Z is the number of picture elements between the picture element visually sensed by a right eye and the picture element visually sensed by a left eye.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display using a lenticular sheet, and more particularly to an image display by a combination of a lenticular sheet and a composite image formed by printing out an image sampled by digital processing in a computer. Improvement of optimal lenticular shape.

[0002]

2. Description of the Related Art Conventionally, a lenticular sheet is combined with a composite image in which a plurality of images having parallax are arranged on the same plane in units of linear pixels, so that observation can be performed with the movement of an observation viewpoint. It is well known to provide a display that changes the image to be displayed or to realize a display that is stereoscopically viewed. (See Fig. 1)

[0003] The conventional method for producing a composite image includes intermittent photographing of a stationary subject by a desired means (for example, a moving camera, or an intermittent photographing of a rotating subject on a turntable by a fixed camera). A plurality of images (original images) having parallax (parallax in the horizontal direction or deviation due to time difference) obtained by photographing or photographing a still object at once using a multi-lens camera from multiple directions. ) Were synthesized by a manual photographic technique while being displaced little by little on a photosensitive film provided on its flat surface via a lenticular sheet.

[0004] An example of the above synthesis step will be described with reference to the drawings. First, five original images A to E having continuous parallax as shown in FIG. 2 are prepared by desired means.

FIG. 3 is an explanatory diagram showing an example of a synthesizer. The synthesizing machine 30 is basically a stretching machine, which enlarges and projects an original image and synthesizes and exposes it on a film 32 exposed through a lenticular plate 31.

As an example of a synthesizing method (almost not used at present), images of the original images A to E are synthesized during one pitch of the lenticular plate 31. The light (image light) incident on the lenticular plate 31 is condensed and compressed linearly. As shown in FIGS. 4 to 6, the image of the original image A is located at one pitch end of the lenticular plate 31.
The lenticular plate 31 and the film 32 to be exposed are integrally tilted by a predetermined amount with respect to the light receiving section, and a predetermined exposure is performed. Next, the angle of the image of the original image B is set so as to be exposed next to the image of the original image A, and the image is exposed. Similarly, the image of the original C, the image of the original D, and the image of the original E are exposed. In this manner, the images 1 to are linearly arranged and synthesized within one pitch. As shown in FIG. 7, the pitches are the same, and a synthesized image F is obtained.

Although the structure of the original image holding section in the synthesizing machine is not shown, the original image can be arbitrarily set at a predetermined position. The original image is exposed at the same position as the original image, the floating image portion is exposed at a position slightly shifted with parallax required for floating, and the sinking image is exposed at a position slightly shifted with parallax required for sinking. Thereby, as shown in FIG. 8, for example, an image is viewed with the right eye R and an image is viewed with the left eye L.
A three-dimensional effect can be obtained.

In the production of a composite image by the above-described photographic method, linear pixels are necessarily formed at desired positions on the photosensitive film 32 according to the characteristics of the lenticular sheet.
That is, even with pixels of the same original image, pixels are formed near the center of the cylindrical lens near the center of the lenticular sheet, but pixels are formed at positions shifted from the center of the cylindrical lens at the end of the lenticular sheet. . (Not shown) When the observer views the produced lenticular display body from the original image position at the time of synthesis, the pixels from all the cylindrical lenses are visually recognized by the observer under correct conditions, and a clear image is observed.

Recently, it has become easy to produce a digital composite image represented by CG (computer graphics), and there is a demand for applying the digital composite image to a lenticular display body. According to the pitch, a synthesized image is obtained in which the pitch at which the linear pixels are arranged is substantially uniform (from the center to the end of the lenticular sheet).

[0010] By digital processing in the computer,
Although it is possible to appropriately set the pixel formation position according to the viewing conditions, there is currently no specific means that can faithfully reflect the pixel formation position in the print output according to the setting in units of microns. Not realized. Even for a printer having a resolution of 300 dpi that has been put to practical use, the minimum pixel width is 25400/300 ≒ 85 μm,
It is.

If the formation position of the pixel in accordance with the observation conditions is not appropriate, a crosstalk (visualization of a pixel that should not be visually recognized) may be caused, and a clear image will not be naturally observed.

In the photographic method, since the pixels are formed at desired positions of the cylindrical lens depending on the characteristics of the lenticular sheet, the specifications of the lenticular sheet (pitch / curvature of the cylindrical lens, sheet thickness) are changed. Even if the setting is not strictly set in advance, the display can be viewed as desired. Therefore, a design concept of matching the specifications of the lenticular sheet to the pixels (synthesized images) has not been reported so far.

[0013]

According to the present invention, even when a digital composite image composed of existing print output is used, the pixels from all the cylindrical lenses are visually recognized by an observer under appropriate conditions, and the image is sharp. It is an object of the present invention to provide a lenticular display in which a natural image is observed.
In other words, the lens of the lenticular sheet is designed according to the output (digital composite image) so that linear pixels are formed at desired positions of the corresponding cylindrical lens in the same manner as in the photographic method described above. With the goal.

[0014]

That is, according to the present invention, a plurality of images having parallax are arranged on the same plane in linear pixel units according to the characteristics of a lenticular sheet having cylindrical lenses arranged side by side. In the lenticular display body including the composite image arranged and the lenticular sheet, the composite image is a print output of an image sampled by digital processing in a computer, and the lenticular sheet satisfies the following conditions. A lenticular display body having a shape.

[0015]

(Equation 2)

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 9 is an explanatory diagram illustrating a state in which the lenticular display body is observed. In the figure, D ₀ ; observation distance e; interocular distance N; number of images (the number of original images of parallax images) P _L ; pitch of cylindrical lenses P _g ; pitch of one pixel (pixels when pixels are close to each other) Width) n; Refractive index of the lenticular sheet Z; Number of pixels between the pixel viewed by the right eye and the pixel viewed by the left eye.

[0017]

(Equation 3)

Here, the resolution of the output device (printer) is x
Assuming (dpi), P _g = (25.4 / x) + α α; blur amount of image

Therefore, P _L is as follows.

[0020]

(Equation 4)

Further, t is as follows.

[0022]

(Equation 5)

Regarding the curvature of the cylindrical lens,
If P _L and t are determined, R (curvature) is uniquely determined so that the incident light beam (parallel light) is focused on the flat surface opposite to the cylindrical lens group.

For example, if D ₀ = 400 (mm) e = 65 (mm) N = 4 n = 1.53 Z = 1 x = 300 α = 0.000167, then, for the above embodiment, t: 0.79572 P _L = 0.33757 R = 0.29233.

[0025]

According to the display of the present invention, even when a digital composite image composed of existing print output is used, all pixels are visually recognized by an observer under appropriate conditions, and are reproduced on the entire display. Image quality can be significantly improved.

[0026]

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the principle of a lenticular display.

FIG. 2 is an explanatory diagram showing an example of a plurality of original images having parallax.

FIG. 3 is an explanatory diagram showing an example of an original image synthesizer according to the related art.

FIG. 4 is an explanatory view showing a process of synthesizing an original image according to a conventional technique.

FIG. 5 is an explanatory diagram showing a process of synthesizing an original image according to a conventional technique.

FIG. 6 is an explanatory view showing an original image synthesizing step according to a conventional technique.

FIG. 7 is an explanatory diagram showing a combined image in which an original image is combined.

FIG. 8 is an explanatory diagram showing a state in which a lenticular display body is observed.

FIG. 9 is an explanatory diagram showing a state in which a lenticular display body is observed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lenticular sheet 2 ... Synthetic image 3 ... Cylindrical lens 30 ... Synthesizer 31 ... Lenticular sheet 32 ... Photosensitive film

Claims (1)

[Claims] A composite image in which a plurality of images having parallax are arranged on the same plane in linear pixel units in accordance with the characteristics of a lenticular sheet in which cylindrical lenses are juxtaposed; A lenticular display comprising a sheet, wherein the composite image is a printout of an image sampled by digital processing in a computer, and wherein the lenticular sheet has a shape satisfying the following conditions: body. (Equation 1)