JP4095267B2 - Stereo imaging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is one of methods for taking a stereoscopic image, and relates to an integral photography (IP) system, and by using an optical shielding plate, a high image quality without multiple images generated due to interference. The present invention relates to a three-dimensional image photographing device that realizes
[0002]
[Prior art]
The IP system is known as one of the stereoscopic image systems in which a stereoscopic image can be freely viewed from an arbitrary viewpoint, and an apparatus that can provide an image that can be directly input to an IP display with a simple configuration is disclosed in US Pat. No. 2,174,003. Proposed in the issue. The following describes how an IP image is captured using the IP image capturing device, and how the light rays of the captured subject are reproduced by displaying the captured image on an IP display.
[0003]
First, the principle of the IP image photographing apparatus of US Pat. No. 2,174,003 will be described with reference to FIG. FIG. 7A is a schematic diagram illustrating a configuration of the imaging device, and FIG. 7B is a schematic diagram illustrating a captured image. For easy understanding, a concave lens array 212 in which two point light sources (point light source A211 indicated by ● and point light source B211 indicated by ■) are taken as subjects and a large number of concave lenses are arranged in a plane to photograph the subject. Among these, in practice, the concave lens array 212 is configured by arranging thousands to several million concave lenses vertically and horizontally. Further, FIG. 7A shows only three concave lenses 212b, 212c, and 212d in order to simplify the drawing and make it easy to understand. Light is emitted in various directions from the point light source A211 marked with ● and the point light source B211 marked with ■. The light rays that enter the lens 214 of the camera 213 through the concave lenses (... 212b, 212c, 212d,...) Of the concave lens array 212 are limited to the illustrated light ray 215.
[0004]
Here, the convex lens 217 disposed in the vicinity of the concave lens array 212 has a function of causing light to efficiently enter the lens 214 of the camera 213. As a result, an image 216 taken by the camera 213 through the concave lens array 212 appears as shown in FIG. The positions of the point light sources A211 and B211 photographed in the concave lenses 212b, 212c and 212d correspond to the angles of light rays incident on the concave lenses, and the positional relationship between the concave lens 212b, 212c and 212d corresponds to the position of each concave lens. The two point light sources that can be seen from are not reversed and are in the same positional relationship.
Therefore, when the captured image 216 is input to the IP display, a stereoscopic image is displayed.
An array refers to a state in which they are arranged in a chain and arranged vertically and horizontally.
[0005]
Next, how a stereoscopic image is displayed will be described with reference to FIG. FIG. 8 is a schematic diagram illustrating the reproduction of light when an image captured by a conventional stereoscopic image capturing apparatus is displayed on an IP display, and FIG. 8B is a schematic diagram illustrating the captured image. It is.
The IP display 221 has a convex lens array 224 in which convex lenses (... 223b, 223c, 223d,...) Are arranged in the vicinity of the front side of a flat display 222 such as a transmissive photographic film or a liquid crystal display. It is. When an image 216 is displayed on the photographic film or flat display 222, a light beam 225 is emitted from each convex lens (... 223b, 223c, 223d, ...) as shown in the figure. As a result, when the flat display 222 is viewed through the convex lens array 224, a point light source 226 marked with ● and a point light source 227 marked with ■ are reproduced. It can be seen that these point light sources are equal to the point light source A211 marked with ● and the point light source B211 marked with ■ where the point light source shown in FIG. Thus, a stereoscopic image of the subject can be viewed without using special glasses.
[0006]
[Problems to be solved by the invention]
However, there were the following problems. FIG. 9 is a schematic diagram showing a state in which light areas photographed by different concave lenses interfere when the camera is focused on the back side of the concave lens array when viewed from the camera. As described above, in the IP image capturing apparatus, images generated by different concave lenses may be captured by interference at the same place. The manner in which images are taken with interference will be described with reference to FIG. For the sake of clarity, five concave lenses of the concave lens array 233 are shown. Further, the convex lens 217 shown in FIG. 7 is arranged for the purpose of allowing light to efficiently enter the camera 213, but is omitted in FIG. 9 for the sake of simplicity. Now, as shown in FIG. 9, the point light source A232 with a mark ● sufficiently far from the focal length of the concave lenses constituting the concave lens array 233 is formed as a virtual image at the position C232 with a mark ▲ by the concave lens 233c. The focus position of the camera 231 is arbitrary, but it is assumed here that the camera 231 is focused on the position of the virtual image C232 marked with a triangle. In this case, the light of the virtual image C232 marked with ▲ is collected by the lens of the camera 231 and formed on the image sensor 234 as an image D232.
[0007]
Further, the point light source B232 marked with ■, which is sufficiently far from the focal length of the concave lenses constituting the concave lens array 233, forms a virtual image at the position of C232 marked with ▲ by the concave lens 233b. The light of the virtual image C232 is collected by the lens of the camera 231 and formed on the image sensor 234 as an image D232. That is, there is a problem in that images of different subjects pass through different concave lenses and then form an image at the same position on the image sensor 234 and interfere with each other.
It is conceivable that these interference regions occur between different concave lenses other than between the concave lens 233b and the concave lens 233c.
In FIG. 9, it is assumed that the camera is focused on the back side of the concave lens array as viewed from the camera.
[0008]
Next, FIG. 10 is a schematic diagram showing a state in which light areas photographed by different concave lenses interfere when the camera is focused on the front side of the concave lens array when viewed from the camera. is there.
Here, for the same reason as in FIG. 9, five concave lenses of the concave lens array 243 are illustrated, and the convex lens 217 illustrated in FIG. 7 is omitted. The point light source A 242 emitted from the camera 241 so as to collect light near the front side of the concave lens array 243 (a distance shorter than the image-side focal length of the concave lens) is moved from the camera 241 to the concave lens array 243. On the front side of the image, a concave lens 243c forms an image as a solid image C242 with a triangle mark.
Although the focus position of the camera 241 is arbitrary, it is assumed here that the camera 241 is focused on the position of the real image C242.
[0009]
In this case, the light of the real image C242 is collected by the lens 245 of the camera 241 and formed on the image sensor 244 as an image D242. Further, another point light source B242 marked with ■ is emitted by the concave lens 243b so as to be focused near the front side of the concave lens array 243 from the camera 241 (a distance shorter than the image-side focal length of the concave lens). Again, a real image is formed at the position of C242. The light of the real image C242 is collected by the lens of the camera 241 and formed on the image sensor 244 as an image D242. That is, there is a problem that images of different subjects overlap each other at the same position on the image sensor 244 and pass through after passing through different concave lenses.
These interference regions may occur between different concave lenses other than between the concave lens 243b and the concave lens 243c.
In addition, when an image existing in an interference region generated between different concave lenses is captured, the image becomes a multiple image, and when the image captured as a multiple image is displayed on an IP display, it is not reproduced separately, and a stereoscopic image is displayed. There was a problem of deteriorating.
[0010]
Therefore, the present invention has been made in view of these problems, and an object of the present invention is to provide a stereoscopic image capturing apparatus that can avoid capturing as a multiple image without causing interference.
[0015]
[Means for Solving the Problems]
The invention described in claim 1 includes a concave lens array in which a plurality of concave lenses are arranged in an array, an optical shielding plate that shields light leakage between the concave lenses adjacent to each other, and the concave lens array. A camera having a lens for focusing, and the concave lens array is provided with the optical shielding plate on the opposite side of the concave lens array when viewed from the camera, and the optical shielding plate has an optical axis for focusing. the same angle is a three-dimensional image photographing apparatus you characterized by being provided.
According to the first aspect of the present invention, there is provided a stereoscopic image photographing device that can avoid photographing as a multiple image without interference by providing an optical shielding plate on the opposite side of the concave lens array when viewed from the camera. can do.
Note that the array shape means a state of being arranged vertically and horizontally.
[0016]
The invention described in claim 2 includes a concave lens array in which a plurality of concave lenses are arranged in an array, an optical shielding plate that shields light leakage between the concave lenses adjacent to each other, and the concave lens array. A camera having a lens for focusing, and the concave lens array is provided with the optical shielding plate on the near side of the concave lens array as viewed from the camera, and the optical shielding plate has an optical axis for collecting light a standing body imaging apparatus you characterized in that the same angle is provided.
According to the second aspect of the present invention, there is provided a three-dimensional image photographing device that is capable of avoiding photographing as a multiple image without interference by providing an optical shielding plate on the front side of the concave lens array when viewed from the camera. can do.
[0017]
The invention described in claim 3 includes a concave lens array in which a plurality of concave lenses are arranged in an array, an optical shielding plate that shields light leakage between the concave lenses adjacent to each other, and the concave lens array. A convex lens disposed in close proximity and a camera having a lens that focuses on the concave lens array through the convex lens, and the convex lens disposed in proximity to the concave lens array includes the convex lens as viewed from the camera. wherein the optical shielding plate is provided on the opposite side, the optical shielding plate is an elevational body imaging apparatus you characterized in that the same angle with the optical axis for converging thus provided.
According to a third aspect of the present invention, there is provided a stereoscopic image photographing apparatus capable of avoiding the occurrence of multiple images without interference by providing an optical shielding plate on the opposite side of the concave lens array when viewed from the camera. can do.
[0018]
The invention described in claim 4 includes a concave lens array in which a plurality of concave lenses are arranged in an array, an optical shielding plate that shields light leakage between the concave lenses adjacent to each other, and the concave lens array. A convex lens disposed in close proximity and a camera having a lens that focuses on the concave lens array through the convex lens, and the concave lens array in proximity to the convex lens is provided with the optical shielding plate on the front side of the camera is, the optical shield is an elevational body imaging apparatus you characterized in that the same angle with the optical axis for converging thus provided.
According to the fourth aspect of the present invention, it is possible to provide a stereoscopic image capturing apparatus that can avoid being captured as a multiple image without interference by providing an optical shielding plate on the front side of the camera.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First Embodiment) A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing a configuration of a stereoscopic image photographing apparatus of the present invention. As shown in FIG. 1, the apparatus of the present invention includes a concave lens array 111 (... 111b, 111c, 111d, 111e, 111f...) In which a plurality of concave lenses are arranged, and the back side of each concave lens constituting the concave lens array 111 (TV). disposed on the camera side opposite of) the composed optical shielding plate 112 and the television camera 113, a television camera 113 is provided with a photoelectric conversion element 115 such as an imaging lens 114 and CCD (Charge Coupled device). The imaging lens 114 of the television camera 113 can be focused on the back side of the concave lens array 111 when viewed from the television camera 113.
[0021]
Practically, several thousand to several million concave lenses are arranged vertically and horizontally to form the concave lens array 111, but only five concave lenses are shown in order to simplify the drawing and make it easy to understand. The size of the shielding plate 112 is determined according to the distance from the focus position of the television camera 113 to the concave lens array 111.
The shielding plate 112 is preferably a plate that has a light reflectance of 0 (zero) on the surface, but the material is not particularly limited. For example, visible light used for photographing is visible light. , Which is opaque, that is, made of a material that does not transmit light used for photographing. In the present embodiment, the shielding plate 112 uses a nickel alloy as an example in order to prevent the temperature from rising due to absorption of light, and deformation and deterioration. Further, it is sufficient that the thickness is such that the diameter of the lens used is not large.
As a result, the point light source A marked with ● is imaged as shown in FIG. 1, but the point light source B marked with ■ can be prevented from interference by the optical shielding plate 112, and therefore is affected by multiple images. Absent.
[0022]
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic diagram illustrating the configuration of the stereoscopic image capturing apparatus, as in FIG. 1. As shown in FIG. 2, the apparatus of the present invention includes a concave lens array 121 in which a plurality of concave lenses are arranged, an optical shielding plate 122 disposed in front of each concave lens constituting the concave lens array (on the TV camera side), and a television set. The television camera 123 includes an imaging lens 124 and a photoelectric conversion element 125 such as a CCD. The imaging lens 124 of the television camera 123 can be focused on the front side of the concave lens array 121 when viewed from the television camera 123.
[0023]
Practically, several thousand to several million concave lenses are arranged vertically and horizontally to form the concave lens array 121. Here, in order to simplify the drawing and make it easy to understand, only five concave lenses are shown. The size of the shielding plate 122 is determined according to the distance from the focus position of the television camera 123 to the concave lens array 121. The respective light ranges do not interfere with each other due to the effect of the optical shielding plate 122 and are photographed separately. As a result, the same light beam as that of the original subject is reproduced, and a stereoscopic image can be viewed without being affected by multiple images without pearl glasses.
[0024]
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic diagram illustrating a configuration of the stereoscopic image capturing apparatus. The apparatus of the present invention has a concave lens array 131 and a convex lens 133 that are arranged close to each other, and the other configuration is the same as that of the first embodiment shown in FIG. The distance between the concave lens array 131 and the convex lens 133 can be determined as appropriate for the convenience of the device configuration.
[0025]
Further, for the same reason as the apparatus of the first embodiment, only five concave lenses are shown. The size of the shielding plate 132 is determined according to the distance from the focus position of the television camera 135 to the concave lens array 131. The respective light ranges do not interfere with the effect of the optical shielding plate 132 and are photographed separately. As a result, the same light rays as the original subject are reproduced, and a stereoscopic image can be viewed without being affected by multiple images without special glasses.
[0026]
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a schematic diagram showing the configuration of the stereoscopic image capturing apparatus as described above. The apparatus according to the present invention has a convex lens 143 arranged close to the concave lens array 141 in the apparatus of the second embodiment, and the other configuration is the same as that of the apparatus of the second embodiment shown in FIG.
As shown in FIG. 4, a convex lens 143 is disposed adjacent to the concave lens array 141. The distance between the concave lens array 141 and the convex lens 143 can be determined as appropriate for the convenience of the device configuration.
[0027]
For the same reason as in the apparatus of the second embodiment, only five concave lenses are shown. The size of the shielding plate 142 is determined according to the distance from the focus position of the television camera 145 to the concave lens array 141. The respective light ranges do not interfere with each other due to the effect of the optical shielding plate 142 and are photographed separately. As a result, the same light rays as the original subject are reproduced, and a stereoscopic image can be viewed without being affected by multiple images without special glasses.
[0028]
Here, a modification of the first and second embodiments of the present invention will be described with reference to FIGS. FIG. 5 shows a state in which the focal length 152f of the convex lens 152 disposed close to the concave lens array 151 matches the distance from the convex lens 152 to the imaging lens 154 of the camera 153. Whether the convex lens 152 is disposed in front of or behind the concave lens array 151 when viewed from the camera 153 can be determined as appropriate for the convenience of the apparatus configuration, but FIG. 5 shows a state in which the convex lens 152 is disposed on the near side. The focus of the camera 153 is adjusted to the back side of the concave lens array 151 when viewed from the camera 153. In this state, the direction of the light beam that each concave lens constituting the concave lens array 151 contributes to photographing coincides with the optical axis direction of each concave lens. Therefore, by matching the shielding蔽板155 and the optical axis direction of each lens, it is possible to avoid interference.
[0029]
FIG. 5 shows a state in which the focus of the camera 153 is set to the back side of the concave lens array 151 when viewed from the camera 153. However, when the focus is set to the near side of the concave lens array 151, the shielding plate 155 is attached to the concave lens array 151. Needless to say, it should be arranged on the front side. This is shown in FIG. 6 and will not be described.
[0030]
As a third modification of the present invention, any one of the devices in the first, second, third and fourth embodiments and the first and second modifications described above is used as one unit. May be arranged in an array.
[0033]
【The invention's effect】
According to the first aspect of the present invention, when the optical shielding plate is provided on the opposite side of the concave lens array when viewed from the camera, it is possible to avoid the occurrence of interference and avoid that multiple images are captured. Can be provided.
[0034]
According to the invention described in claim 2 , when the optical shielding plate is provided on the front side of the concave lens array when viewed from the camera, it is possible to avoid shooting as a multiple image without causing interference. Can be provided.
[0035]
According to the third aspect of the present invention, when the optical shielding plate is provided on the opposite side of the concave lens array when viewed from the camera, it is possible to avoid the occurrence of interference and avoid multiple image shooting. Can be provided.
[0036]
According to the invention described in claim 4 , it is possible to provide a stereoscopic image capturing device that can avoid being captured as a multiple image without interference by providing an optical shielding plate on the front side of the camera. it can.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a configuration of a stereoscopic image capturing apparatus according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating a configuration of a stereoscopic image capturing apparatus according to a second embodiment of the present invention.
FIG. 3 is a schematic diagram illustrating a configuration of a stereoscopic image capturing apparatus according to a third embodiment of the present invention.
FIG. 4 is a schematic diagram illustrating a configuration of a stereoscopic image capturing apparatus according to a fourth embodiment of the present invention.
FIG. 5 is a schematic diagram of a stereoscopic image capturing apparatus showing a modification of the first and second embodiments of the present invention when the focus of the camera is set to the back side of the concave lens array when viewed from the camera.
FIG. 6 is a schematic diagram of a stereoscopic image capturing device showing a modification of the first and second embodiments of the present invention when the camera is focused on the near side of the concave lens array when viewed from the camera.
FIG. 7A is a schematic diagram illustrating a configuration of a conventional stereoscopic image capturing apparatus.
(B) is a schematic diagram which shows the image | photographed image.
FIG. 8A is a schematic diagram showing the reproduction of light when an image captured by a conventional stereoscopic image capturing apparatus is displayed on an IP display.
(B) is a schematic diagram which shows the image | photographed image.
FIG. 9 is a schematic diagram showing a state in which light areas photographed by different concave lenses interfere with each other when the focus of a conventional camera is set to the back side of the concave lens array when viewed from the camera.
FIG. 10 is a schematic diagram showing a state in which light areas photographed by different concave lenses interfere with each other when the focus of a conventional camera is set to the near side of the concave lens array when viewed from the camera.
[Explanation of symbols]
111,121,131,141,151 concave lens array 112,122,132,142,155 shielding plate 113,123,135,145,153 TV camera 114,124,134,144,15 fourth imaging lens 133 and 143, 152 Convex lenses 115, 125 Photoelectric conversion element 152f Focal length

Claims (4)

A concave lens array in which a plurality of concave lenses are arranged in an array, an optical shielding plate that shields light leakage between the concave lenses adjacent to each other, and a camera having a lens that focuses on the concave lens array. Prepared,
The concave lens array is provided with the optical shielding plate on the opposite side of the concave lens array when viewed from the camera,
The optical shielding plate, the three-dimensional image photographing apparatus you characterized in that the same angle with the optical axis for converging thus provided. A concave lens array in which a plurality of concave lenses are arranged in an array, an optical shielding plate that shields light leakage between the concave lenses adjacent to each other, and a camera having a lens that focuses on the concave lens array. Prepared,
The concave lens array is provided with the optical shielding plate on the front side of the concave lens array when viewed from the camera,
The optical shielding plate, you characterized in that the same angle with the optical axis for converging thus provided steric imaging apparatus. A concave lens array in which a plurality of concave lenses are arranged in an array; an optical shielding plate that shields light leakage between the concave lenses adjacent to each other; and a convex lens disposed in proximity to the concave lens array; A camera having a lens that focuses on a concave lens array through a convex lens;
The convex lens arranged in proximity to the concave lens array is provided with the optical shielding plate on the opposite side of the convex lens as viewed from the camera,
The optical shielding plate, you characterized in that the same angle with the optical axis for converging thus provided steric imaging apparatus. A concave lens array in which a plurality of concave lenses are arranged in an array; an optical shielding plate that shields light leakage between the concave lenses adjacent to each other; and a convex lens disposed in proximity to the concave lens array; A camera having a lens that focuses on a concave lens array through a convex lens;
The concave lens array close to the convex lens is provided with the optical shielding plate on the front side of the camera,
The optical shielding plate, you characterized in that the same angle with the optical axis for converging thus provided steric imaging apparatus.

Images