JPS6364017A - Stereoscopic viewer for stereo cinephotographic film - Google Patents

Abstract

PURPOSE:To facilitate stereoscopically viewing an image by providing an image reforming optical system which separates the image of a projection lens into a left image and a right image and turns respective images at 90 deg.. CONSTITUTION:This device is provided with the image reforming optical system which separates the image of a projection lens 2 into a left image and a right image and turns respective images at 90 deg.. A cinefilm 5 loaded to a projector is wound up in the direction of an arrow A while having two frames of an right image 51a and a left image 51b irradiated through a mask 4 by a light source 3. Images 51a and 51b irradiated by the light source 3 are projected after not only horizontally and vertically inverted but also reversed by the lens 2. Images projected by the lens 2 are horizontally inverted by the first plane mirror 81 of an optical system and are made incident on the second plate mirror 82 and are vertically inverted and are vertically inverted again by the third reflective mirror 83 and are projected to a screen 6 from the rear side. A left image 51b' and a right image 51a' are projected on the left and the right respectively on the screen 6, and they are three-dimensionally seen through a stereo viewer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stereoscopic viewing device for stereocine photographic film.

[Conventional technology]

2. Description of the Related Art In the field of X-ray image diagnostic equipment, devices are known that examine stereocinematic film (hereinafter simply referred to as stereocine film) to examine diseased areas, such as abnormalities in blood vessels. On stereocine film, left and right images of the same subject are alternately recorded by two imaging means (an X-ray tube with two X-ray focal points and one imaging device) placed in different imaging directions. ing.

The conventional method for stereoscopic viewing of film images was to alternately project left and right images onto the same position on a screen. A method of stereoscopically viewing images that are alternately projected at the same location is performed as follows. Projection optical system (lens, prism, etc.) of a projector that projects film
A polarizing filter is placed on each frame of the right image and left image to be projected, and the polarizing filter is rotated 90 degrees at a time and synchronized to directly and linearly polarize each frame and project it. An observer observes an image projected on a screen through a polarizing filter using polarized glasses with polarization directions that differ by 90 degrees on the left and right sides. At this time, for the observer, the right image on the screen can only be seen with the right eye, and the left image can only be seen with the left eye. Stereoscopic vision is achieved by alternately and continuously viewing the left image with the right eye and the left image with the left eye.

The technology of projecting left and right images with different polarization onto a screen and observing them through polarized glasses is described in "Video Information 85-12. Pages 1197 to 1200."
It is described in.

[Problem that the invention seeks to solve]

In the conventional method using the above-mentioned polarizing filter and polarized glasses, the image visible to the viewer is distorted, making it difficult to obtain stereoscopic viewing. Nine, it takes some getting used to to be able to see the left and right images side by side and see them in 3D by looking at the left and right images respectively, and even more so to be able to see them in 3D in a short time by looking at alternating images. It was extremely difficult.

Furthermore, since the left and right images are projected alternately on the same screen (or so!), there is a problem in that stereoscopic viewing is impossible when the film is held still.

One way to solve these problems caused by polarized light is to use glasses with shutters, but even with this, the image on the screen would flicker with just one image, making stereoscopic viewing impossible in a stationary state. Due to these problems, the current situation is that stereoscopic viewing of moving images has not become popular.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a stereocine film viewing device that can easily provide stereoscopic viewing.

[Means for solving problems]

The problem with the prior art described above is that the left image and the left image are projected alternately on the same position on the screen. This occurs because an attempt is made to use the principle of polarization to create a three-dimensional view of an object in which multiple images are always projected. In other words, this occurs because images projected at the same location are viewed stereoscopically by being distinguished between the right and left eyes. Furthermore, since the light-enhancing technique is used, the image becomes dark and difficult to observe.

Therefore, the present invention projects a left image and a left image simultaneously on a screen, so that the right image can only be seen with the right eye, and the left image can only be seen with the left eye. , In other words, it is characterized by the fact that stereoscopic viewing is possible by observing separate images with both eyes in chronological order without using polarized light.

The means to make this possible is a projector that feeds and projects stereo cine film as a pair of left and right frames, and a projector that arranges the left and right frames and turns the film image on the screen by 90 degrees. and a stereopure device that allows the left and right images to be observed independently with the left and right eyes, which are projected side by side on a screen.

Examples will be described below, including their effects.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration diagram of a stereocine photographic film stereoscopic viewing apparatus of the present invention. Reference numeral 1 designates a projector), on which a projection lens 2, a light source 3, and a mask 4 are provided. The mask 4 has a window corresponding to two frames of the image on the film. 5 is a cine film, and the subject is alternately photographed by two photographing means 52 &... right image 5 na, left image 5
Left images and left images are alternately and consecutively imprinted as indicated by nb. This cine film 5 is rolled up and conveyed in the direction of the arrow by a drive mechanism (not shown) housed inside the projector 1. 6 is a screen made of something like frosted glass or a semi-transparent acrylic plate, which enlarges the two images projected by the projector 1, for example, the right FI 51a and the left FF 151b, to create a substantially life-sized image 51a';
51b' are formed and arranged so that two can be displayed side by side at the same time. 7 is the stereo pure image 51
3' and 51b' are separately incident on the left and right eyepieces 71 and 72, respectively. 9 is an observer.

Before explaining the operation, we will discuss the peculiarities of stereocine film. Stereo cine shooting film is 35
■Generally, two frames are photographed on a cine film to a film length equivalent to a normal 35 mfi image, and during photographing, the film is advanced in the direction of the body axis (longitudinal) of the subject. (3rd
(See figure) For this reason, if the left and right images were simply lined up and projected for stereoscopic viewing, the observer would see the image of the subject from the side. Therefore, the observer must make an observation while converting the image 90 degrees in his head, which is very tedious. Therefore, the apparatus of the present invention is provided with an image correction optical system 8 that separates the image of the projection lens 3 into a left image and a stone image and changes the direction of each image by 90 degrees. This image correction optical system is constructed by combining three plane mirrors for a total of six.

An example of the configuration of the image correction optical system 8 will be explained with reference to FIG. The three plane mirrors are a first plane mirror 81 that inverts the image from the projection lens left and right, a second plane mirror 82 that inverts the image from the first plane mirror up and down, and a final mirror that inverts the image from the second plane mirror up and down again. It consists of a third plane mirror 83 that projects an image from a vertically long film onto a screen in a horizontally long manner. This combination of plane mirrors may include one or two prisms.

Next, the operation will be explained with reference to FIGS. 1 and 2.

The cine film 5 loaded in the projector 1 is wound up in the direction of the arrow while the two frames of the R image 51a and the L image 51b are illuminated by the light source 3 by the mask 4. illuminated by a light source. The images of the third edge 51a and the L image 51b are reversed horizontally and vertically by the projection lens 2, and
The context is also reversed and projected. The image projected by the projection lens 2 is transmitted to the first plane mirror 81 of the image correction optical system 8.
The horizontally reversed image is incident on the second plane mirror 82 and is vertically reversed. Then, the image that is vertically inverted by the second plane mirror 82 is again reflected in the third reflection *8
3, the image is flipped upside down and projected onto the screen 6. Projection onto the screen 6 is made from the back side of the screen 6. The image projected onto the screen 6 is an L image 51b' on the left side.
and R image 51a' are projected on the right side, both horizontally long, as if facing the subject in FIG. These two images are observed by an observer 9 via a stereo camera 7. With Stereopure 7, only the L image is observed with the left eye, and only the R image is observed with the right eye, and the subject 9 can synthesize the two images and view them stereoscopically.

In the embodiments described above, stereoscopic viewing is possible with an image facing the subject, rather than an image of the subject seen from the side as in the conventional case, and the burden on the observer can be reduced. This problem can be solved by feeding the cine film in a direction perpendicular to the patient's body axis during X-ray photography, but the number of frames that can be captured on the film is greatly reduced, so it is difficult to use the film effectively. From this point of view, the present invention is superior.

In order to reproduce images captured by feeding film orthogonally to the subject's body axis, the image correction optical system of the present invention is made removable, and the image is projected from the front of the screen after being removed. It is possible to respond. Furthermore, it goes without saying that observation is possible even when film feeding is stopped.

The present invention is not limited to the above-mentioned embodiments, and it is also effective to interpose an optical system (between the film and the projection lens), such as a known 16-sided prism, for smooth projection of images.

〔Effect of the invention〕

As described above, according to the present invention, the left image and the stone image can be simultaneously projected on the screen as if facing the subject, and the images can be observed without using polarized light.

Since the image is bright and clear, stereoscopic viewing is easily possible.

Observation is possible even when film transport is stopped.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the device showing the outline of the present invention, Figure 2 is a
FIG. 1 is a principle diagram showing details of the image correction optical system, and FIG. 3 is a diagram showing film feeding in a stereo X-ray imaging apparatus. 1... Projector, 2... Projection lens, 3... Light source,
4... Mask, 5... Cine film, 6... Screen, 7... Stereopure, S... Image correction optical system, 9... Observation 1st mouth 11'Rin 2nd Z-th 3 b

Claims (1)

[Scope of Claims] 1. A stereo cine photographic film in which one copy pair is alternately imprinted as left and right images by two photographing means, and two frames of the right image and left image of this cine film. means for illuminating the images as a pair; first optical system means for projecting the two-frame images as a pair; second optical system means for separating the projected images and converting the directions by 90 degrees; It is characterized by being comprised of a screen that projects images from the system means side by side, and a stereoscopic viewing means that allows the left and right images on the screen to be observed independently with the left and right eyes. Stereocine film stereoscopic viewing device. 2. The stereocine photographic film stereoscopic viewing apparatus according to claim 1, wherein the second optical system means is configured to be removably inserted.