JPH04283739A - Photographing method for stereoscopic image - Google Patents

Abstract

PURPOSE:To see a sharp stereoscopic image which has no longitudinal distortion by placing a camera in an exposure state while rotating a subject on a perpendicular line, and also moving a lenticular plate laterally in a one-pitch horizontal direction. CONSTITUTION:The lenticular plate 19 formed by connecting many cylindrical lenses, extending perpendicularly, successively in the horizontal direction is held on a frame body 18. The lenticular plate 19 has the convex surface side of the cylindrical lenses positioned on the side of a photographic lens 12a. A film 16 as a photosensitive body is arranged behind the lenticular plate 19. While a turntable 11 rotates at a constant speed, the shutter of the camera 12 is released and the lenticular plate 19 is moved horizontally at a constant speed by one pitch with the film 16 fixed. Linear converged images converged by the cylindrical lenses are formed successively to expose the photosensitive surface and an observer can view the stereoscopic image.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for taking a three-dimensional image (for example, a three-dimensional photograph) using a lenticular plate.

0002

[Prior art] As a method for taking stereoscopic photographs,
The one disclosed in Japanese Patent No. 5-23512 is known.

In this patented invention, as shown in FIG. 3, a subject 2 is placed on a rotary table 1, a lenticular plate 3 having a series of cylindrical lenses is bonded to a photosensitive plate 4, and the lenticular plate 3 is The photosensitive plate 4 to which the
The rotary table 1 and the camera 5 are arranged oppositely so that a is located on the optical axis of the lens 6 of the camera 5, the rotary table 1 and the photosensitive plate 4 are rotated synchronously, and the rotation table 1 is rotated. The object is to sequentially or intermittently photograph the circumferential surface of the object 2 that is displaced accordingly on the photosensitive plate 4.

According to this photographing method, reflected light from a portion 2a of the circumferential surface of the subject 2 enters the lenticular plate 3 via the lens 6, is refracted by the lenticular plate 3, reaches the photosensitive plate 4, and is exposed to light. Plate 4 is exposed to light. When the photosensitive plate 4 is exposed to light, the reflected light from the subject 2 passes through the cylindrical lens of the lenticular plate 3 and is converged into a linear shape, so that a linear converged image is exposed on the photosensitive plate 4. By rotating the photosensitive plate 4 while the rotary table 1 is rotating, a continuous convergent image with parallax is exposed to the photosensitive plate 4.

[0005] Therefore, when looking at a photograph in which the lenticular plate 3 is bonded again at the same pitch to a developed photo of the photosensitive plate 4 separated from the lenticular plate 3, and the lenticular plates 3 are bonded for both the left and right eyes, the left and right eyes are A convergent image enlarged in the width direction by the lenticular plate 3 can be seen. Since a parallax is created between the magnified convergent images seen by both the left and right eyes due to the rotation of the rotary table 1, the viewer of the photograph can see a three-dimensional image.

[0006]

[Problems to be Solved by the Invention] However, in this conventional photographing method, when the photosensitive plate 4 is rotated inside the camera 5 when photographing the subject 2, the rotation start position of the photosensitive plate 4 and the At the end of the movement, the position of the photosensitive plate 4 relative to the imaging position of the lens 6 changes, so even if the depth of field is within the allowable range, the vertical size of the formed subject image changes. Put it away. For this reason, when an observer observes the stereoscopic image as a stereoscopic photograph, there is a problem in that the stereoscopic image tends to be distorted in the vertical direction and become unclear.

[0007]

[Object of the Invention] The present invention has been made to improve such conventional photographing methods, and allows an observer to view a clear stereoscopic image without vertical distortion when viewing a stereoscopic photograph. The purpose is to make it possible.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the method of photographing a three-dimensional image according to the present invention includes disposing a subject in the optical axis direction of a photographing lens of a camera, and aligning the photographing lens in the camera with a photosensitive member. A lenticular plate with the convex side of a large number of vertically extending cylindrical lenses facing the photographing lens is disposed between the body and the photographic subject, and the reflected light from the subject passes through the photographing lens and this lenticular plate and is condensed. The photoconductor surface of the photoconductor is positioned at a position to be imaged, and while the subject is rotated at a predetermined angle at a constant speed about a vertical line, the camera is brought into an exposure state, and the photoconductor and the lenticular plate are exposed. The cylindrical lens is characterized by being moved laterally in the horizontal direction by one pitch of the cylindrical lens.

[0009]

[Operation] According to the method of photographing a three-dimensional image according to the present invention,
The subject is rotated around a vertical line while the camera is exposed, and either the lenticular plate or the photoconductor is moved horizontally by one pitch of the cylindrical lens, so there is no parallax on the photosensitive surface of the photoconductor. Certain convergent images are taken continuously. After this photoreceptor is separated from the lenticular plate, developed, fixed, and dried, the same lenticular plate is again bonded onto the photographed image of the photoreceptor with the pitch adjusted. It will be expanded in the direction. Therefore, when this zygote is observed with both the left and right eyes, the left and right eyes each recognize photographed images with parallax, allowing the viewer to see a three-dimensional image.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of photographing a stereoscopic image according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a method of photographing a stereoscopic image according to an embodiment of the present invention, in which 10 is a subject, 11 is a turntable, and 12 is a camera. The optical axis of the photographing lens 12a of the camera 12 extends toward the subject 10 on the turntable 11.

The turntable 11 is attached to the upper end of a rotating shaft (not shown) extending vertically from a fixed base 11a positioned on the floor 13. The rotating shaft is rotated by a pulse motor and a speed reduction mechanism built into the fixed base 11a. The pulse motor inside the fixed base 11a rotates at a predetermined speed and through a predetermined angle based on a drive control signal from the control device 14. In this embodiment, the turntable 11
performs a constant speed movement of rotating 10 degrees every 10 seconds, but the actual rotation angle is set larger than 10 degrees in order to avoid shock at startup and achieve constant speed movement.

In order to detect the angle at which the turntable 11 shifts to constant speed motion, the fixed base 11a is provided with a start detection switch (not shown) provided on the back surface of the turntable 11. The activation detection switch may be configured by a pair of photoelectric conversion elements such as a photocoupler, or may be configured by a limit switch. A table start signal indicating that the turntable 11 has started constant speed motion by the start detection switch is output to the control device 14. Based on this table activation signal, the control device 14 outputs a photographing signal to the camera 12 to open the shutter.

A photographic lens 12a is disposed on the front side of a housing 15 of the camera 12, and an opening 1 is provided at the rear of the housing 15 for setting a film 16 as a photoreceptor.
5a is formed. A pair of guide grooves 17 extending in the horizontal direction are provided at upper and lower portions of the opening 15a. A frame 18 is slidably held in the guide grooves 17, 17. The frame 18 slides in the direction of arrow A in FIGS. 1 and 2 by the rotation of a screw 15a rotated by a pulse motor (not shown) provided at the rear of the housing 15. That is, the screw thread 15a is provided with a cam 15b having a tapered surface, and the cam 15b is attached to the frame 1.
The frame body 18 moves by sliding along the cams 18a of No.8. The frame body 18 is a cam 15 of a screw screw 15a.
It is spring biased towards the b side. A large number of scale slits with intervals of μm are formed at equal intervals in the lower part of the frame 18, and a beam of light is irradiated toward the scale slits from below the frame 18. This beam light passes through the scale slit and is detected by a photoelectric conversion element provided in the housing 15, and the photoelectric conversion element detects the number of scale slits that have passed through and transmits it to the control device 14. Frame body 18
Holds a lenticular plate 19 formed by a large number of vertically extending cylindrical lenses arranged in series in the horizontal direction.

In this lenticular plate 19, the convex side of the cylindrical lens is located on the photographing lens 12a side. A film 16 as a photoreceptor is disposed behind the lenticular plate 19. The photosensitive surface of the film 16 is in close contact with the lenticular plate 19 in a slidable manner, and the pitch at which the cylindrical lenses of the lenticular plate 19 are formed is 0.4 mm in this embodiment. The distance between the convex surface of the cylindrical lens of the lenticular plate 19 and the photosensitive surface is such that the image of the subject incident from the photographic lens is formed on the photosensitive surface via the lenticular plate 19.

The range in which the lenticular plate 19 is moved in the horizontal direction matches the pitch of the cylindrical lenses of the lenticular plate 19. As shown in FIG. 2, while the turntable 11 is rotated, the lenticular plate 19 moves by one pitch of the cylindrical lens, thereby forming a continuous convergent image within one pitch of the cylindrical lens. be able to. In this embodiment, when the turntable 11 rotates 10 degrees in 10 seconds, the lenticular plate 19 moves laterally by 0.4 mm, which corresponds to one pitch. During this horizontal movement, the shutter of the camera 12 is opened, and the photosensitive surface of the film 16 is exposed at a rate of 0.04 mm per second.
Continuous shooting is performed within the range.

In the method of photographing a stereoscopic image of this embodiment, while the turntable 11 is rotating at a constant speed, the shutter of the camera 12 is opened, and the film 1 is
6 is fixed and the lenticular plate 19 is moved laterally (horizontally) by one pitch at a constant speed.
A linear convergent image converged by a cylindrical lens is continuously exposed onto a photosensitive surface. Therefore, after developing, fixing, and drying this film 16 to obtain a photo of the same size, the lenticular plate 19 is aligned and bonded so that the cylindrical lenses extend vertically over the photo and the pitch thereof matches. If a display or the like is created by this, a parallax will be created between the images observed by both eyes of the observer, and the observer will be able to visually recognize a three-dimensional image.

[0017] Since a stepless and continuous convergent image is exposed during one pitch, a three-dimensional image can be seen even if the viewer views the display from different angles. A similar effect can also be obtained by periodically opening and closing the shutter of the camera 12 at high speed when the turntable 11 is rotated. That is, when the shutter is opened and closed at a low speed, a linear unexposed portion occurs within one pitch of the film 16 between the convergent images taken when the shutter is closed. Therefore,
If the shutter is opened and closed periodically at low speeds, white lines may be visible in the display, depending on the viewing angle of the resulting display.

However, when photographing is performed with the shutter open or periodically opened and closed at high speed, the film 16 is exposed to stepless and continuous convergent images, so that the resulting image is When viewing the display, you won't see white lines depending on the viewing angle.

Moreover, since the lenticular plate 19 is moved in the horizontal direction, the position of the object image focused through the photographing lens of the camera 12 remains almost constant, so that the vertical direction of the converged image is not changed as in the conventional case. Distortion is reduced, and the resulting 3D image on the display becomes clear and easy to view with little distortion.

[0020]

[Effect] According to the method of photographing a stereoscopic image according to the present invention,
When an observer views a stereoscopic photograph, the clarity of the stereoscopic image viewed by the observer can be improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a stereoscopic image capturing method according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which a convergent image is exposed on a film when the lenticular plate slides according to an embodiment of the present invention.

FIG. 3 is a schematic explanatory diagram of a conventional stereoscopic image capturing method.

[Explanation of symbols]

10...Subject 11...Turntable 12...Camera 14...Control device 15a...Screw screw 15b...cam 16...Film 18...frame body 18a...cam 19...Lenticular plate

Claims (2)

[Claims] Claim 1: A subject is arranged in the optical axis direction of a photographing lens of a camera, and a number of cylindrical lenses extending vertically are placed between the photographing lens and a photoreceptor in the camera, with the convex side facing the photographing lens side. A lenticular plate is provided, and the photosensitive surface of the photoreceptor is positioned at a position where the reflected light of the subject passes through the photographic lens and the lenticular plate to form an image, and the subject is centered on a vertical line. While rotating the camera at a predetermined angle at a constant speed, the camera is placed in an exposure state, and either the photoreceptor or the lenticular plate is horizontally moved by one pitch of the cylindrical lens. A method for taking stereoscopic images. [Claim 2] The method for photographing a stereoscopic image according to Claim 1, comprising:
A method for photographing a stereoscopic image, comprising periodically opening and closing a shutter of the camera at high speed during exposure of the camera.