KR100425885B1 - Apparatus for obtaining an anaglyph - Google Patents

Abstract

The present invention separates the color components by using a dichroic filter that can separate the color components according to the wavelength among the color components of the subject image, and then optically synthesizes the left and right images of the subject to separate images. A three-dimensional image acquisition device capable of acquiring a three-dimensional image of a subject without using a synchronization circuit and software. The three-dimensional image acquisition device includes a total reflection mirror adjuster having a jig, a fixed axis, and a fixing portion for fixing and reflecting angles of the total reflection mirror, dichroic filter, concave lens, convex lens, and total reflection mirror.

Description

3D image acquisition device {APPARATUS FOR OBTAINING AN ANAGLYPH}

The present invention relates to a three-dimensional image acquisition device, and more particularly, to a three-dimensional image acquisition device employing a dichroic filter capable of obtaining a three-dimensional image of a subject through a single conventional camera. It is about.

The technology related to 3D image is largely divided into 3D image acquisition technology and display technology, and there may be various types of acquisition technologies depending on which display technology is used. Currently, three-dimensional image display technology widely used includes a technique using a complementary glasses, a technique using polarized glasses, a technique using glasses using a liquid crystal shutter (LCD shutter). 3D image display technology using complementary color glasses, as is well known, uses a filter that transmits the red color component of the color components included in the subject image on one side and the blue and green color components on the other side. Complementary glasses that use filters to let people see the subject image in three dimensions. 3D image display technology using polarized glasses requires a special display device for outputting a polarized subject image, and 3D image display technology using glasses using a liquid crystal shutter is more expensive than complementary glasses or polarized glasses. In addition to being expensive, a separate additional circuit is required to synchronize the glasses and the display device. In addition, a subject image to which a 3D image display technology using polarizing glasses and a liquid crystal shutter is applied may not take the form of a photograph or a printed matter.

In a technique for obtaining a three-dimensional image of a subject, conventionally, two subject images are acquired at the same time by using two cameras arranged in parallel. In this case, two cameras arranged in parallel should be calibrated to have exactly the same optical characteristics, and since two cameras are used, a three-dimensional image acquisition device is expensive and its size is large, making it difficult for the general public to use.

To solve this problem, various types of devices have been developed for acquiring three-dimensional images of a subject using a single camera. Among them, representative 3D image acquisition apparatuses include beam splitters and liquid crystal shutters. As shown in FIG. 1, the 3D image acquisition apparatus using the beam splitter includes a left optical axis 101 and a right optical axis through an optical system 100 including four total reflection mirrors 11, 12, 13, and 14. By providing the same effect as having two cameras virtually on 102, the two cameras exhibit the same effect as acquiring an image of a subject (not shown). In other words, the total reflection mirrors 12 and 13 function as beam splitters. However, such an apparatus obtains the left and right images of the subject by dividing the original image of the subject in half so that the field of angle (FOA) is narrowed. The 3D image acquisition apparatus employing the liquid crystal shutter acquires a 3D image of the subject by sequentially photographing left and right images of the subject through the liquid crystal shutter. However, such a device also has a disadvantage in that two subject images must be taken to obtain one three-dimensional image of the subject. To overcome this disadvantage, interlacing, a display technique widely used in a display device such as a television, is used. A device using an interlaced scanning method has been developed, but since this device also needs to synchronize the operation of the liquid crystal shutter using an image output signal, a separate circuit for image synchronization is required in addition to the two liquid crystal shutters. When outputting a 3D image of a photographed subject, there is a problem in that glasses having a liquid crystal shutter and a wired / wireless synchronization circuit for synchronizing the screen and the liquid crystal glasses should be added.

Accordingly, the present invention has been made to solve the above-described problems, the subject after separating the color component using a dichroic filter that can separate the color component according to the wavelength of the color component of the subject image It is an object of the present invention to provide a three-dimensional image acquisition apparatus that can obtain a three-dimensional image of the subject without using a separate image synchronization circuit or software by optically synthesizing the left and right images of the.

According to a first aspect of the present invention, a first optical element for enlarging and transmitting a first image of a predetermined subject incident along a first optical axis and a second image of a subject incident along a second optical axis Filtering the red color component among the second optical element to transmit and the color component included in the first image passing through the first optical element to transmit a third image including only the remaining color components and transmitting the second optical element Provided is a 3D image acquisition device including a third optical element for filtering a blue and green color component among color components included in a second image to reflect a fourth image including only the remaining color components.

In addition, according to the second aspect of the present invention, the red color component of the color components included in the first image of the predetermined subject incident along the first optical axis is filtered to transmit a third image including only the remaining color components. And a first optical device for filtering the blue and green color components among the color components included in the second image of the subject incident along the second optical axis to reflect the fourth image including only the remaining color components. An image acquisition device is provided.

1 is a three-dimensional image acquisition device according to the prior art using a beam splitter.

2 is a three-dimensional image acquisition device according to a first embodiment of the present invention.

3 is a three-dimensional image acquisition device according to a second embodiment of the present invention.

4 is a three-dimensional image acquisition device according to a third embodiment of the present invention.

5 is a three-dimensional image acquisition device according to a fourth embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

21: total reflection mirror

22: dichroic filter

23, 24: concave lens

25 convex lens

26: camera connection

30: total reflection mirror adjustment unit

210: housing

220: camera

Hereinafter, with reference to the accompanying Figures 2 to 5 will be described in detail preferred embodiments according to the present invention. In the present specification, the same reference numerals denote the same components.

First, referring to FIG. 2, FIG. 2 illustrates an apparatus for obtaining a 3D image according to a first embodiment of the present invention. As shown in FIG. 2, the three-dimensional image acquisition device 200 according to the first embodiment includes a total reflection mirror 21, a dichroic filter 22, concave lenses 23 and 24, and convex. It includes a total reflection mirror adjuster 30 having a jig 27, a fixed shaft 28, and a fixed portion 29 for adjusting the lens 25 and the total reflection mirror 21. . Optical elements such as the total reflection mirror adjuster 30 and the dichroic filter 21 are combined into a housing 210 to form a 3D image acquisition device 200, which is a 3D image acquisition device 200. ) Is coupled to the camera 220 through a camera connection 26 provided on the housing 210.

The dichroic filter 22 employed in the present invention is an optical element in which reflection and transmission are determined according to the wavelength of a color component in a subject image, and three primary colors of red, blue, and green (hereinafter, red is R (Red). ), Blue is referred to as B (Blue), and green is referred to as G (Green). The longest "R" component is totally reflected and relatively shorter "B" and "G" components are transmitted. Has characteristics. As illustrated in FIG. 1, the dichroic filter 22 is disposed at a 45 degree angle with respect to a subject image incident along the first optical axis 201. The “R” component of the color component of the subject image incident through the concave lens 24 along the first optical axis 201 is perpendicular to the first optical axis 201 at point C _DF on the dichroic filter 22. Since the light is reflected along the optical axis 203, only the image having “B” and “G” components of the subject image are incident on the camera 220 in the direction of the first optical axis 201. On the other hand, the subject image incident along the second optical axis 202 is reflected by the total reflection mirror 21 and dichroic along the optical axis 204 perpendicular to the first optical axis 201 through the concave lens 23. The point C _DF on the blade filter 22 is reached, and due to the characteristics of the dichroic filter 22 as described above, only the “R” component of the object image is transmitted to the first optical axis 201. Optically synthesized with the "B" and "G" components. The “R”, “B”, and “G” components of the optically synthesized subject image form a three-dimensional image B _I for complementary glasses on the camera 220. Here, it should be noted that the 3D image B _I may be a moving image as well as a still image (eg, a photo).

In the first embodiment of Fig. 2, the reason for using the concave lenses 23 and 24 and the convex lens 25 is to compensate for the field of view (FOA) of the obtained subject image. When the angle of view is widened by the total reflection mirror 21 of the three-dimensional image acquisition apparatus 200, the portion is included in the three-dimensional image of the subject acquired up to the outer portion of the total reflection mirror 21, and thus the portion becomes useless image. In order to solve this problem, in the present invention, the convex lens 25 having the convex lenses 23 and 24 widening the angle of view of the camera 220 is enlarged and the convex lens 25 having the effect of narrowing the angle of view again is the front of the camera connection part 26. Mounted on to restore the original angle of view that the camera 220 has.

Also, in order to maintain the same magnification of each of the subject images incident to the camera 220 along the first optical axis 201 and the second optical axis 202, that is, the subject left and right images, the same focal length. And a concave lens 24 on the first optical axis 201 and a concave lens 23 on the second optical axis 204 having optical refractive characteristics, which are the same distance from the point C _DF on the dichroic filter 22. Are arranged in. In the first embodiment of FIG. 2, the angle of the total reflection mirror 21 is adjusted by the total reflection mirror adjusting unit 30 to adjust the overall depth (ie, depth) of the 3D image that a human feels. It was configured to be adjusted about 45 degrees with respect to. Depth of the 3D image is caused by the distance difference in the horizontal direction of the left and right images before synthesis. Therefore, when the angle of the total reflection mirror 21 is adjusted through the jig 27, the left image, that is, the subject image incident along the second optical axis 202 is moved in the horizontal direction, and thus the distance between the left and right images is changed. Therefore, the overall depth of the acquired 3D image can be adjusted.

The total reflection mirror 21 is mounted on the basis of the fixed axis 28 of the total reflection mirror adjusting unit 30, and the reflection angle of the incident object image is adjusted by rotating the jig 27 as described above. Through the three-dimensional image acquisition apparatus 200, the left and right images of the subject incident along the first optical axis 201 and the second optical axis 202 are optically synthesized into one three-dimensional image B _I for complementary glasses, The synthesized three-dimensional image B _I may be obtained by the camera 220 and displayed through a display device such as a color monitor or various types of color printed matter.

Referring to FIG. 3, FIG. 3 is a block diagram of an apparatus for acquiring a 3D image according to a second embodiment of the present invention. As shown in FIG. 3, the three-dimensional image acquisition apparatus 300 according to the second embodiment is similar to the three-dimensional image acquisition apparatus 200 according to the first embodiment of the present invention. The total reflection mirror adjustment unit 30, the total reflection mirror adjustment unit 30, the dichroic filter 22, and the opening 31 for adjusting and fixing the lower wing filter 22, the opening 31, and the total reflection mirror 21. The housing 210 for mechanically coupling the, and the connecting portion 26 provided in the housing 210. However, unlike the first embodiment of FIG. 2, the 3D image acquisition apparatus 300 shown in FIG. 3 does not employ the concave lenses 23 and 24 and the convex lens 25 to secure a wide angle of view. It can be used when a wide angle of view is not required, and the operation principle except for the angle of view correction function by these lenses is the same as that of the 3D image acquisition apparatus 200 of FIG. 2, and will be omitted here for simplicity.

Referring to FIG. 4, FIG. 4 is a block diagram of an apparatus for obtaining a 3D image according to a third embodiment of the present invention. As shown in FIG. 4, the three-dimensional image acquisition device 400 according to the third embodiment includes a total reflection mirror 21, a dichroic filter 22, concave lenses 23 and 24, and a convex lens 25. , A total reflection mirror adjustment unit 30 for fixing and angle adjustment of the total reflection mirror 21, an “R” component transmission filter 431 disposed at the rear of the concave lens 23, and a rear of the concave lens 24. "B" and "G" component transmission filter 441, total reflection mirror adjustment unit 30, dichroic filter 22, concave lenses 23 and 24, and "R" component transmission filter 431 and "B" And a housing 210 for mechanically coupling the "G" component permeable filter 441, and a connection portion 26 provided in the housing 210. The three-dimensional image acquisition device 400 shown in FIG. 4 is an "R" component pass filter 431 and "B" and "" than the three-dimensional image acquisition device 200 of FIG. A G ″ component pass filter 441 is further employed. Since the operation principle of the 3D image acquisition apparatus 400 of FIG. 4 is similar to the 3D image acquisition apparatus 200 illustrated in FIG. 2, a description thereof will be mainly focused on the differences thereof.

The operation principle of the dichroic filter 22 used in the present invention is an optical element whose reflection and transmission are determined according to the color components of the subject image, that is, the "R", "G", and "B" components as described above. However, no commercially available dichroic filter can completely separate the "R", "G", and "B" components. Referring to the dichroic filter 22 employed in the present invention, for example, the "R" component of the subject image incident along the first optical axis 201 is defined by the dichroic filter 22 by the dichroic filter 22. 401 and the optical axis 203 in the vertical direction should not be incident to the camera 220, but in reality, a predetermined "R" component is included in the subject image passing through the dichroic filter 22, so that the convex lens ( It enters the camera 220 via 25. Similarly, the "B" and "G" components among the components of the subject image incident along the second optical axis 402 should not completely penetrate the dichroic filter 22 and enter the camera 220, but may also have a predetermined " The subject image including the components B ″ and “G” is incident on the camera 220. Because of this phenomenon, since the quality of the acquired three-dimensional image B _I is degraded, in the third embodiment of the present invention, the "R" component permeation filter 431 and the "B" and "G" component permeation filters (441) is used to improve the quality of the 3D image for the subject. As shown in FIG. 4, the “R” component permeable filter 431 may be disposed at the position of 432, and the “B” and “G” component permeable filters 441 are also disposed at the position of 442. Can be.

Referring to FIG. 5, FIG. 5 is a block diagram of an apparatus for acquiring a 3D image according to a fourth exemplary embodiment of the present invention. As shown in FIG. 5, the 3D image acquisition apparatus 500 of the fourth embodiment includes a total reflection mirror adjusting unit for fixing and angle-adjusting the total reflection mirror 21, the dichroic filter 22, and the total reflection mirror 21. 30, "R" component permeation filter 531, "B", and "G" component permeation filter 541 are included. Unlike the third embodiment, the 3D image acquisition apparatus 500 illustrated in FIG. 5 does not employ the concave lenses 23 and 24 and the convex lens 25 used to secure a wide field of view, and thus, a wide field of view. This operation can be used when not required, and the rest of the operation principles except for the angle of view correction are the same as those of the 3D image acquisition apparatus 400 according to the third embodiment shown in FIG.

As described above, by using the three-dimensional image acquisition apparatus according to the present invention, it is possible to obtain a three-dimensional image for the complementary glasses for the subject with a conventional one camera, so as to use two cameras as in the prior art Since it is structurally simpler than a device for obtaining three images by synthesizing three images, the overall weight and size of the three-dimensional image acquisition device can be reduced, and the three-dimensional images are optically synthesized at the same time as the image is taken. There is a feature that can obtain a three-dimensional image without image processing. In addition, the total reflection mirror adjustment unit can easily adjust the depth (depth) of the three-dimensional image, and since only one conventional camera is used, it can be used when mounted to a camera that is widely distributed to the general public, without having to purchase an additional camera. Although the present invention has been described and illustrated through preferred embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the appended claims. will be.

Claims (11)

In the 3D image acquisition device, A first optical element for enlarging and transmitting a first image of a predetermined subject incident along the first optical axis; A second optical element for enlarging and transmitting a second image of the subject incident along a second optical axis; Filtering a first predetermined color component among the color components included in the first image transmitted through the first optical element to transmit a third image including only the remaining color components, and transmitting the second image. A third optical element for filtering a second predetermined color component among the color components included in the second image passing through the optical element to reflect a fourth image including only the remaining color components Including, And outputting the third image and the fourth image on the same optical axis to optically synthesize the 3D image obtaining apparatus. The method of claim 1, The first and second images are images of the same subject that contain the same color components, And the first and second images are incident perpendicularly to the first and second optical elements, respectively. The method of claim 2, And a fourth optical element for total reflection of the second image at a predetermined angle, wherein the second image is incident by the fourth optical element perpendicularly to the second optical element. The method of claim 3, wherein And a depth of the three-dimensional image obtained by adjusting the preset angle of the fourth optical element. The method of claim 2, A first filter disposed in series on the same axis as the first optical element and filtering the predetermined first color component of the first image; A second filter disposed in series on the same axis as the second optical element and filtering the preset second color component of the second image; An optical element having a function of focusing the three-dimensional image of the subject 3D image acquisition device further comprising. The method of claim 1, And the third optical element is a dichroic filter. In the 3D image acquisition device, Filters a first predetermined color component among the color components included in the first image of the predetermined subject incident along the first optical axis to transmit a third image including only the remaining color components, and enters along the second optical axis. A first optical element for filtering a second predetermined color component among the color components included in the second image of the subject to reflect the fourth image including only the remaining color components, And outputting the third image and the fourth image on the same optical axis to optically synthesize the 3D image obtaining apparatus. The method of claim 7, wherein The first and second images are images of the same subject that contain the same color components, And the second image is incident on the first optical element perpendicular to the first image by a second optical element having a total reflection function. The method of claim 8, 3D image acquisition apparatus for varying the depth of the three-dimensional image obtained by adjusting the second image reflection angle of the second optical element. The method of claim 7, wherein A first filter disposed perpendicular to the first image incident along the first optical axis to filter the predetermined first color component of the first image; A second filter disposed perpendicular to the second image incident along the second optical axis to filter the preset second color component of the second image; An optical element having a function of focusing the three-dimensional image of the subject 3D image acquisition device further comprising. The method of claim 7, wherein And the first optical element is a dichroic filter.