JP2012150341A - Three-dimensional photographing camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional photographing camera capable of making a display device display an image which gives less sense of incongruity to a person viewing the image, when a viewer views a three-dimensional image displayed on the display device.SOLUTION: In the three-dimensional photographing camera, one lens out of two lenses provided on the three-dimensional photographing camera is a standard lens for photography, and the other lens out of the above described two lenses is a soft focus lens.

Description

  The present invention relates to a three-dimensional imaging camera.

  Recently, 3D images have been spotlighted. The reason why an image recognized by human eyes is perceived as three-dimensional is because of the eye width. In other words, the eye width is the distance between the human left eye and right eye, and depending on the eye width, the image seen in the left eye and the image seen in the right eye differ slightly, and the brain compares these different images, According to the comparison result, the difference in distance from the human eye to the object is recognized. That is, when a plurality of objects are viewed at the same time, the depth differs for each object, and the objects appear three-dimensional due to the different depths.

  Incidentally, a three-dimensional imaging camera for displaying a three-dimensional image has two lenses like a human eye, and the distance between the two lenses is considered to be the human eye width. The human eye width is 55 to 70 mm for an adult, but the two lenses of the three-dimensional camera cannot be installed at such a small distance between the two lenses in the camera. The distance is longer than the normal adult eye width.

  FIG. 8 is a view showing a conventional three-dimensional imaging camera 700.

  In the conventional three-dimensional camera 600, two lenses L11 and L12 are provided in the case 10, and an image viewed with the human right eye is captured by the lens L11, and an image viewed with the human left eye is captured by the lens L12. . In order to make the images obtained from the two lenses L1 and L2 identical to each other, two identical lenses are used. That is, a photographic standard lens is used as the lens L1, and the same photographic standard lens as the lens L1 is used as the lens L2.

JP 2010-181826 A

  However, in the above conventional example, the viewer feels uncomfortable when the viewer views a three-dimensional image displayed on a display device (not shown). In other words, the brain recognizes that the three-dimensional image displayed on the display device is different from an image in which a person actually sees an object existing around the person. That is, an image other than the focused image (background image or the like) is more blurred than when it is actually viewed by a human, so that the viewer is viewing the three-dimensional image displayed on the display device. It seems that I feel uncomfortable.

  The present invention provides a three-dimensional imaging camera capable of displaying on a display device an image that feels less uncomfortable when a viewer views the three-dimensional image displayed on the display device. The purpose is to provide.

  The present invention uses a soft focus lens as at least one of two lenses provided in a three-dimensional imaging camera.

  According to the present invention, when a viewer views a three-dimensional image displayed on a display device, an effect that a user feels that there is little sense of incongruity held by the person viewing the image can be displayed on the display device. Play.

It is a figure which shows the three-dimensional imaging camera 100 which is Example 1 of this invention. FIG. 3 is a diagram illustrating a photographic standard lens L1 and a soft focus lens L2 in Example 1. It is a figure which shows the three-dimensional imaging camera 200 which is Example 2 of this invention. It is a figure which shows the three-dimensional imaging camera 300 which is Example 3 of this invention. It is a figure which shows the internal structure of the three-dimensional imaging camera 100, and the internal structure of the three-dimensional imaging camera 400 which is Example 4 of this invention. It is a figure which shows the three-dimensional imaging camera 500 which is Example 5 of this invention. It is a figure which shows the three-dimensional imaging camera 600 which is Example 6 of this invention. It is a figure which shows the conventional three-dimensional imaging camera 700. FIG.

  The modes for carrying out the invention are the following examples.

  FIG. 1 is a diagram showing a three-dimensional imaging camera 100 that is Embodiment 1 of the present invention.

  The three-dimensional imaging camera 100 includes a case 10, a photographic standard lens L1, and a soft focus lens L2. The lenses L1 and L2 form an image of an object on a light receiving surface of a light receiving element (not shown), the light receiving element converts light into an electric signal, and the electric signal converted by the light receiving element is signal processing unit (not shown). Signal), and the processed electrical signal is held in a memory (not shown).

  The standard lens L1 for photography is a lens corresponding to the human right eye. The soft focus lens L2 is a lens corresponding to the human left eye. If the focal length of the standard lens L1 for photography is 50 mm, the focusing distance is 1.8 to 3 m. On the other hand, in the soft focus lens L2, if the focal length is 50 mm, the distance in focus is 2 m to 100 m.

  Next, the operation of the first embodiment will be described.

  FIG. 2 is a diagram illustrating the photographic standard lens L1 and the soft focus lens L2 in the first embodiment.

  The photographic standard lens L1 has one image forming position P1, and an image is formed at the image forming position P1, and all images are formed at the image forming position P1 regardless of the position of the object.

  On the other hand, the soft focus lens L2 is a lens in which the spherical aberration SA is appropriately left and has a plurality of imaging positions, for example, imaging positions P21, P22, and P23. The imaging position P23 is an imaging position by a paraxial ray that is a ray close to the central axis. The imaging position P21 is an imaging position by a light ray farthest from the optical axis. It is further away from the soft focus lens L2 in the order of the imaging positions P21, P22 and P23.

  The image taken with the standard lens L1 for photography of the 3D camera 100 is in focus on an object that is located 1.8 to 3 m away from the 3D camera 100, but is taken with the soft focus lens L2. In the same way, the object that is present at a distance of 1.8 to 3 m from the three-dimensional imaging camera 100 is not in focus, but is in focus in soft focus. Moreover, it displays so that the shape can be recognized about the object which is 3 m or more away.

  By the way, in the conventional example, when the viewer looks at the three-dimensional image displayed on the display device (not shown), it feels strange. The image taken through the lens and the image taken through the right lens are both clear, and this clear image is too clear than the person actually sees the object, and the focus is Objects other than the matching object (background, etc.) are displayed completely blurred. It is thought that they feel uncomfortable.

  On the other hand, in Example 1, the photographic standard lens L1, which is the left lens, is in focus, while the soft focus lens L2, which is the right lens, is in focus in soft focus. Since it is not too clear and the background or the like can be recognized to some extent, it is close to the image that the person actually sees, and there is little discomfort for the person who is viewing the image.

  In Example 1, the photographic standard lens L1 is a lens provided on the left side in FIG. 2, and the soft focus lens L2 is a lens provided on the right side in FIG. You may make it reverse. That is, the photographic standard lens L1 may be the right lens in FIG. 2, and the soft focus lens L2 may be the left lens in FIG.

  FIG. 3 is a diagram showing a three-dimensional imaging camera 200 that is Embodiment 2 of the present invention.

  The three-dimensional imaging camera 200 includes a case 10, a soft focus lens L3, and a soft focus lens L4. The lenses L3 and L4 form an image of an object on a light receiving surface of a light receiving element (not shown), the light receiving element converts light into an electric signal, and the electric signal converted by the light receiving element is signal processing unit (not shown). Signal), and the processed electrical signal is held in a memory (not shown).

  The soft focus lens L3 is a left lens (a lens corresponding to the human right eye) in FIG. The soft focus lens L4 is a right lens (a lens corresponding to the human left eye) in FIG. If the focal lengths of the soft focus lenses L3 and L4 are 50 mm, the distance (focal length) at which the soft focus is focused is 1.8 to 3 m, for example.

  That is, the paraxial focal length of the soft focus lenses L3 and L4 (the distance at which the image formation position by the paraxial light beam, which is a light beam close to the central axis of the lens) is farthest from the lens (the object distance is long) is 3 m.

  Next, the operation of the second embodiment will be described.

  In the second embodiment, the images captured by the soft focus lenses L3 and L4 are focused in soft focus on an object that is located 1.8 to 3 m away from the three-dimensional camera 200. In addition, the background can be recognized to some extent.

  In the second embodiment, as described above, since the soft focus lenses L3 and L4 are focused on the soft focus, both images taken through each of the soft focus lenses L3 and L4 are not too clear, and the background and the like. Can be recognized to some extent, so that it is similar to an image that a human is actually seeing, and there is little discomfort for the human who is viewing the image.

  Note that the paraxial focal lengths of the soft focus lenses L3 and L4 are not limited to the above values, and the paraxial focal length may be set to another distance.

  FIG. 4 is a diagram illustrating a three-dimensional imaging camera 300 that is Embodiment 3 of the present invention.

  The three-dimensional imaging camera 300 includes a case 10, a soft focus lens L5, and a soft focus lens L6. Lenses L5 and L6 image an object on a light receiving surface of a light receiving element (not shown), the light receiving element converts light into an electric signal, and the electric signal converted by the light receiving element is signal processing unit (not shown). Signal), and the processed electrical signal is held in a memory (not shown).

  The soft focus lens L5 is a left lens (a lens corresponding to the human right eye) in FIG. The soft focus lens L6 is a right lens (a lens corresponding to the human left eye) in FIG. Further, if the focal distance of the soft focus lens L5 is 50 mm, the distance (object distance) at which the soft focus is focused is 1.8 to 3 m, for example. If the focal length of the soft focus lens L6 is 50 mm, the soft focus focus distance (object distance) is, for example, 2 m to 100 m.

  Next, the operation of the third embodiment will be described.

  In the third embodiment, an image photographed by the soft focus lens L5 is in focus in soft focus with respect to an object existing 1.8 to 3 m away from the three-dimensional photographing camera 300. An image photographed by the soft focus lens L6 is focused in soft focus on an object that is 2 to 100 meters away from the three-dimensional photographing camera 300. In the third embodiment, as described above, since the soft focus lenses L3 and L4 are focused on the soft focus, both images taken through each of the soft focus lenses L5 and L6 are not too clear, and the background or the like. Can be recognized to some extent, so that it is similar to an image that a human is actually seeing, and there is little discomfort for the human who is viewing the image.

  In this way, the soft focus lens is used as both lenses of the three-dimensional imaging camera, and the focal length of both the soft focus lenses, that is, the paraxial focal length (imaging by a paraxial ray that is a ray close to the central axis of the lens) If the positions of the positions farthest from the lens (the distance with the long object distance) are made different from each other, the discomfort of the person who is looking at the image is reduced as in the case of the image actually seen by the person.

  The paraxial focal lengths of the soft focus lenses L5 and L6 are not limited to the above values, and the paraxial focal length may be set to another distance.

  In Example 3, the paraxial focal length of the soft focus lens L5 is shortened and the paraxial focal length of the soft focus lens L6 is lengthened. However, this may be reversed. That is, the paraxial focal length of the soft focus lens L5 may be lengthened and the paraxial focal length of the soft focus lens L6 may be shortened.

  FIG. 5 is a diagram showing an internal structure of the three-dimensional imaging camera 100 and an internal structure of a three-dimensional imaging camera 400 that is Embodiment 4 of the present invention.

  FIG. 5A is a diagram illustrating an outline of the internal structure of the three-dimensional imaging camera 100 according to the first embodiment.

  In the three-dimensional imaging camera 100 shown in FIG. 5A, the light that has passed through the photographic standard lens L <b> 1 forms an image on the light receiving element 21, and the light that has passed through the soft focus lens L <b> 2 forms an image on the light receiving element 22. The images formed by the light receiving elements 21 and 22 are converted into electric signals, which are stored in a memory (not shown) and output from the three-dimensional imaging camera 100.

  FIG. 5B is a diagram showing an outline of the internal structure of the three-dimensional imaging camera 400 that is Embodiment 4 of the present invention.

  The three-dimensional imaging camera 400 is a modification of the first embodiment. In the three-dimensional imaging camera 100, the polarizing plate PP1 is provided in front of the standard lens L1 for photography, and the polarizing plate PP2 is in front of the soft focus lens L2. Is provided.

  The polarizing plate PP1 is a combination of a polarizing plate that passes a horizontal wave and a polarizing plate that passes a vertical wave, and a polarizing plate that passes a horizontal wave and a polarizing plate that passes a vertical wave. The extinction ratio (also referred to as the extinction value) changes by changing the angle. And the higher the extinction ratio of the polarizing plate, the higher the contrast. A desired contrast can be obtained by adjusting the above-mentioned angles. That is, the contrast can be improved by providing the polarizing plate in the three-dimensional imaging camera.

  The polarizing plate PP1 may be provided between the light receiving element 21 and the photographic standard lens L1, and the polarizing plate PP2 may be provided between the light receiving element 22 and the soft focus lens L2. That is, the polarizing plate may be provided before or after the standard lens or soft focus lens for photography. Further, only one of the polarizing plates PP1 and PP2 may be provided.

  Furthermore, the three-dimensional imaging camera 400 may be applied to the second embodiment, the third embodiment, and the sixth embodiment described later.

  FIG. 6 is a diagram showing a three-dimensional imaging camera 500 that is Embodiment 5 of the present invention.

  The three-dimensional photographing camera 500 is provided with one light receiving element 23 instead of the light receiving elements 21 and 22 in the three-dimensional photographing camera 400, and an image of light passing through the standard lens L1 for photography and the soft focus lens L2 is obtained. This is an example of synthesis on the light receiving element 23. Further, a polarizing plate PP3 is provided instead of the polarizing plate PP1, and a polarizing plate PP4 is provided instead of the polarizing plate PP2. The polarizing plate PP3 is a polarizing plate that allows only horizontal waves to pass therethrough, and the polarizing plate PP4 is a polarizing plate that allows only vertical waves to pass. The polarizing plate PP3 may be a polarizing plate that allows only vertical waves to pass therethrough, and the polarizing plate PP4 may be a polarizing plate that allows only horizontal waves to pass therethrough. That is, the polarizing plates PP3 and PP4 are polarizing plates that allow only waves in opposite directions to pass through.

  The light receiving element 23 is an assembly of a large number of unit light receiving elements (elements that receive light for one pixel), and a polarizing element is formed for each unit light receiving element. The light receiving element 23 includes m rows and n columns of unit light receiving elements, and for example, polarizing elements that pass horizontal waves and polarizing elements that pass vertical waves are alternately arranged. For example, a polarizing element that passes a horizontal wave is disposed in unit light receiving elements of even-numbered rows and even-numbered columns and odd-numbered rows and odd-numbered columns, and a polarizing device that passes vertical waves is an even-numbered row and odd-numbered columns and odd-numbered rows and even-numbered columns The unit light receiving element is disposed.

  In addition, among the many unit light receiving elements constituting the light receiving element 23, signals from the unit light receiving elements arranged in the even-numbered and even-numbered columns and the odd-numbered and odd-numbered columns are image signals that have passed through the standard lens L1 for photography. And signals from the unit light receiving elements arranged in the even-numbered and odd-numbered columns and the odd-numbered and even-numbered columns are extracted as image signals that have passed through the soft focus lens L2.

  In order for the light image passing through the lenses L1 and L2 to be combined by the light receiving element 23, the lenses L1 and L2 may be inclined toward the center of the case 10 in FIG.

  A polarizing plate PP3 may be provided between the light receiving element 23 and the standard photographic lens L1, and a polarizing plate PP4 may be provided between the light receiving element 23 and the soft focus lens L2. That is, the polarizing plate may be provided before or after the standard lens or soft focus lens for photography.

  If the three-dimensional imaging camera 500 is used, when the left-eye image and the right-eye image are separately obtained in the three-dimensional imaging camera, it is sufficient to provide only one light receiving element in one three-dimensional imaging camera. . Therefore, in the three-dimensional imaging camera, the installation space for the light receiving element can be reduced.

  Furthermore, the three-dimensional imaging camera 500 may be applied to the second embodiment, the third embodiment, and the sixth embodiment described later.

  FIG. 7 is a diagram showing a three-dimensional imaging camera 600 that is Embodiment 6 of the present invention.

  The three-dimensional imaging camera 600 includes a case 10 and standard lenses L7 and L8 for photography. Lenses L7 and L8 image an object on a light receiving surface of a light receiving element (not shown), the light receiving element converts light into an electric signal, and the electric signal converted by the light receiving element is signal processing unit (not shown). Signal), and the processed electrical signal is held in a memory (not shown).

  The focal length of the photographic standard lens L7 is different from the focal length of the photographic standard lens L8. For example, if the focal length of the standard photographic lens L7 is 20 mm, the focal length of the standard photographic lens L8 is about 10% of 20 mm, that is, about 18 mm or 22 mm. Further, if the focal length of the photographic standard lens L7 is 200 to 300 mm, the focal length of the photographic standard lens L8 is set to a focal length of about 0.5 to 1% of 200 to 300 mm. The above numerical values are examples, and numerical values other than the above may be adopted.

  In Example 6, even if both are photographic standard lenses, the focal length of the lens L7 and the focal length of the lens L8 are different, so when focusing on one lens, the other lens is slightly out of focus. Therefore, it is similar to the case where a soft focus lens is used as one of the lenses, which is close to an image actually viewed by a human being, and less strange to a human viewing the image.

  Moreover, although the said Example is an Example at the time of image | photographing a moving image, each said Example is applicable also when image | photographing a still image.

100, 200, 300, 400, 500, 600 ... 3D camera,
10 ... Case,
L1, L7, L8 ... Standard lenses for photography
L2, L3, L4, L5, L6 ... soft focus lens,
21, 22... Light receiving elements.

Claims (6)

  One of the two lenses provided in the three-dimensional photographing camera is a standard lens for photography, and the other of the two lenses is a soft focus lens. 3D camera. In claim 1,
A three-dimensional imaging camera characterized in that the focal length of the photographic standard lens and the paraxial focal length of the soft focus lens are substantially the same.   A three-dimensional imaging camera characterized in that both of two lenses provided in the three-dimensional imaging camera are soft focus lenses. In claim 3,
A three-dimensional imaging camera, wherein a paraxial focal length of one of the two soft focus lenses is different from a paraxial focal length of the other soft focus lens. The two lenses provided in the 3D camera are both standard lenses for photography.
A three-dimensional imaging camera, wherein a focal length of one of the two lenses is different from a focal length of the other of the two lenses. In any one of Claims 1-5,
A three-dimensional imaging camera, characterized in that a polarizing plate is provided before or after the standard lens for photography or the soft focus lens.

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