CN101937168A - Optical stereo imaging device and stereo camera method - Google Patents

Abstract

The invention discloses an optical three-dimensional imaging device, belonging to the field of three-dimensional image shooting. The optical three-dimensional imaging device comprises a first optical imaging lens group, a second optical imaging lens group, a first dispersion prism and a second dispersion prism, wherein the first optical imaging lens group and the second optical imaging lens group are used for simulating human eyes to receive external light rays and compressing the entered image twice in the horizontal direction relative to the vertical direction; the first dispersion prism and the second dispersion prism are respectively used for refracting and reflecting the incoming light rays corresponding to the first optical imaging lens group and the second optical imaging lens group, and the refracted and reflected light rays form two parallel images on an imaging plane. The invention also discloses a three-dimensional camera shooting method. The optical three-dimensional imaging device and the three-dimensional camera shooting method can be used for acquiring three-dimensional images with good imaging effect at low cost.

Description

Optical stereo imaging device and stereo camera method

technical field

The present invention relates to the technical field of stereoscopic image shooting and processing, and more specifically, relates to an optical stereoscopic imaging device and a stereoscopic imaging method for stereoscopic image shooting.

Background technique

Stereo camera technology and stereo camera products can be applied to products such as mobile phones, video cameras, cameras, MP4, glasses-type display devices, simulated reality devices, and remote-controlled robots, and can play a huge role in civilian, military, scientific research, games and other fields.

The human eye can produce a stereoscopic perception of the seen object according to the visual difference between the left and right eyes, so the general stereo camera equipment uses dual camera lenses to image the object and then process the image. However, the problems brought about by this are very prominent: mainly reflected in 1. The focus and magnification performance of the dual lenses are inconsistent, and the clarity and size of the left and right images may be different, resulting in blurred images. 2. The installation of the dual lens cannot ensure that the images are consistent in alignment, resulting in the inability to ensure the horizontal and tilt consistency of the image in terms of viewing angle. At that time, the two images will deviate when the three-dimensional overlap occurs, and the image will produce blurred images. 3. The difference in the consistency of the dual image sensors leads to inconsistencies in image brightness, contrast, chromaticity, gray scale and other characteristics, and there are obvious visual differences between the left and right images. When the images overlap three-dimensionally, visual dizziness and image blur will occur. 4. When the dual image sensor is imaging, it is difficult to ensure that the two images are pixel-synchronized, and there is a time gap between the left and right eye images. In this way, when synthesizing stereoscopic images or photos, two out-of-synchronization images appear, resulting in poor stereoscopic effect or even The three-dimensional effect is lost and becomes a double image. Therefore, there is a need for an optical stereoscopic imaging device and a stereoscopic imaging method, which uses a precise optical imaging structure to ensure the consistency of the optical path, uses the same lens group and a single image sensor to accept two images, and ensures that the electrical performance of image imaging is complete. Consistent and good synchronization performance.

Contents of the invention

The technical problem to be solved by the present invention is to aim at the inconsistency of the dual-lens parameters generated by the use of dual image sensors in the existing stereoscopic shooting technology, and poor synchronization performance leading to inconsistencies in image brightness, contrast, chromaticity, grayscale, and synchronization To solve the shortcomings and defects, an optical stereoscopic imaging device, a stereoscopic imaging method and a stereoscopic imaging method are provided.

The technical solution adopted by the present invention to solve the technical problem is: to construct an optical stereoscopic imaging device and a stereoscopic imaging method, the optical stereoscopic imaging device comprising:

The first optical imaging lens group and the second optical imaging lens group are used to simulate the human eye to receive external light and compress the incoming image by one time in the horizontal direction relative to the vertical direction;

The first dichroic prism and the second dichroic prism are respectively used to refract and reflect the light rays from the corresponding first optical imaging lens group and the second optical imaging lens group, and the refracted and reflected light rays form juxtaposed beams on the imaging plane Two images.

Specifically, the lateral distance between the first optical imaging lens group and the second optical imaging lens group ranges from 40 to 100 millimeters.

Specifically, the angle of view in the horizontal direction of the first optical imaging lens group and the second optical imaging lens group is twice that of the first prism and the second prism, and the vertical direction remains unchanged.

Specifically, the optical stereoscopic imaging device further includes a single lens group imaging system and a single image sensor.

Specifically, the single lens group imaging system is realized by using a complete camera or a camera lens assembly.

Specifically, the single image sensor is a CCD or CMOS image sensor.

In order to better realize the purpose of the invention, a stereo camera method is provided, which specifically includes the following steps:

S1. Install two optical imaging lens groups side by side to simulate the human eye to receive external light and compress the incoming image by one time in the horizontal direction relative to the vertical direction;

S2. Refracting and reflecting the external light received by the two optical imaging lens groups through two dichroic prisms;

S3. Using a single image sensor to receive the light refracted and reflected by the two dichroic prisms on its imaging plane through the lens group imaging system and form two juxtaposed left and right images.

In the method of the present invention, the lateral distance between the two optical imaging lens groups in the step S1 ranges from 40 to 100 millimeters.

In the method of the present invention, the horizontal field angles of the two optical imaging lens groups are doubled relative to the first prism and the second prism, and remain unchanged in the vertical direction.

In the method of the present invention, the single image sensor is a CCD or CMOS image sensor.

In the method of the present invention, the imaging system of the single lens group is realized by using a complete camera or a camera lens assembly.

Implement a kind of optical three-dimensional imaging device and the three-dimensional photographing method that the present invention provides, through two optical imaging lens groups different from traditional lenses, the image that enters is compressed one time in horizontal direction relative to vertical direction and uses single image sensor, can Obtain a complete image frame with no delay in the left and right frames. Compared with the prior art, the image displayed by the present invention has no delay in the left and right (that is, good synchronization performance), and can maintain the total resolution of the original design image/video , to ensure the consistency of optical, electrical properties, and synchronization of image imaging.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the present invention will be further described, and in accompanying drawing:

Fig. 1 is a structural diagram of a stereoscopic imaging device using the optical stereoscopic imaging device of the present invention according to a preferred embodiment of the present invention,

Fig. 2 is a flow chart of a stereo camera method according to a preferred embodiment of the present invention,

Fig. 3 is a schematic diagram of imaging on an imaging plane of a single image sensor in an optical stereoscopic imaging device according to a preferred embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The present invention will be further elaborated below according to the drawings and specific embodiments.

As shown in FIG. 1 is a structural diagram of a stereoscopic imaging device according to a preferred embodiment of the present invention, wherein the stereoscopic imaging device 100 includes an optical stereoscopic imaging device 110 and an imaging lens assembly system 120 (comprising a single lens group 121 and A single image sensor 122), the optical stereoscopic imaging device 110 constitutes the device of the present invention; the imaging lens assembly system 120 can be a common camera system or a camera device, or a camera device;

The optical stereo imaging component 110 includes a first optical imaging lens group (111, 112), a second optical imaging lens group (114, 115), a first dichroic prism 113, and a second dichroic prism 116;

The first optical imaging lens group (111, 112) and the second optical imaging lens group (114, 115) are used to simulate the human eye receiving external light, and the lenses in the two lens groups are different from traditional lens lenses, when After the image passes through the lens group, the image is compressed twice in the horizontal direction relative to the original image aspect ratio, and the vertical direction remains unchanged, that is, the image maintains the original relative height, and the width is relatively compressed by one time; the first optical imaging lens group ( 111, 112) and the second optical imaging lens group (114, 115) and the lateral distance range is 40 to 100 mm, consistent with the interpupillary distance of the human eye, the first optical imaging lens group (111, 112) and The angle of view of the second optical imaging lens group (114, 115) has a double relationship, ensuring the precision of the structure in installation; The light rays of the optical imaging lens group (111, 112) and the second optical imaging lens group (114, 115) are refracted and reflected; after passing through the first optical imaging lens group (111, 112) and the second optical imaging lens group (114, 115) The compressed image is transmitted to the junction of the lens group imaging system 120 through the first dichroic prism 113 and the second dichroic prism 116 respectively, and then forms side by side on a single CCD/CMOS image sensor 122 by a single lens group 121, and Two images compressed horizontally by 2:1 in the horizontal direction. The image is a SIDE BY SIDE image of the left and right eyes, compressed horizontally 2:1. If the original object is imaged as a square in an ordinary camera, an image with an aspect ratio of about 1:2 will be obtained after passing through the device. In this way, a horizontal 2:1 compressed SIDE BY SIDE stereoscopic image can be obtained without changing the optical lens and image sensor of the original digital camera/video camera, and the total image/video resolution of the original lens assembly design can be maintained. Therefore, the subsequent compression and processing are completely handled according to the original circuit/program.

As shown in Figure 2 is a flow chart of a stereo camera method according to a preferred embodiment of the present invention, the method includes the following steps:

In step S200, two optical imaging lens groups are installed at a position with a lateral distance of 40 to 100 millimeters to simulate the human eye receiving external light;

In step S202, the lenses in the two optical imaging lens groups are different from the traditional lenses. When the image passes through the lens group, the image is compressed by twice the aspect ratio of the original image in the horizontal direction, that is, the image maintains the original relative height , while the image width is relatively compressed twice;

In step S204, the external light received by the two optical imaging lens groups is respectively refracted and reflected by two dichroic prisms;

In step S206, a single image sensor is used to receive the light refracted and reflected by the two dichroic prisms on its imaging plane through the lens group imaging system and form two side-by-side left and right images, that is, through the lens group imaging system on a single CCD/CMOS Two images that are side by side and compressed 2:1 in the horizontal direction are formed on the image sensor. The image is a SIDE BY SIDE image of the left and right eyes, compressed horizontally 2:1. If the original object is imaged as a square in an ordinary camera, an image with an aspect ratio of about 1:2 will be obtained after passing through the device. In this way, a horizontal 2:1 compressed SIDE BY SIDE stereoscopic image can be obtained without changing the optical lens and image sensor of the original digital camera/video camera, and the total image/video resolution of the original lens assembly design can be maintained. Therefore, the subsequent compression and processing are completely handled according to the original circuit/program.

As shown in Figure 3 is a schematic diagram of imaging on the imaging plane of a single image sensor in a stereo camera device according to a preferred embodiment of the present invention, because the left and right images are horizontally compressed using the principle of optics, in the original The total pixels, resolution, and aspect ratio of the stereo image obtained on the image sensor have not changed in any way, so the device does not need to change any circuit and software design of the original 2D camera/camera; the output and displayed image is also SIDE Stereoscopic images of BY SIDE.

To sum up, the key component of the device of the present invention is the optical imaging lens group, which is different from the traditional imaging lens group, it does not focus and image the image completely according to the original ratio, its main function is to image The relative compression in the horizontal direction is doubled. After passing through the optical imaging lens group, the light is refracted and reflected by the dichroic prism and enters the optical system of the camera. The light of the left window enters the left half of the window of the camera through the prism refraction, and the light of the right window enters the right half of the window of the camera. In this way, two images juxtaposed left and right can be obtained on the imaging surface of the camera. Through the design of the appropriate optical imaging lens group and the size of the left and right windows, the final image obtained on the image sensor has an aspect ratio of 1:2, that is, an image that is relatively compressed twice in the horizontal direction, while the left and right windows remain the same viewing angle and aspect ratio. Assuming that the horizontal viewing angle of the components of the traditional optical lens is 50 degrees, and the aspect ratio of the 2D image is 4:3, then after the device of the present invention, two 2:3 images side by side will be obtained, but the left and right images The aspect ratio of the field of view is kept at 4:3, and the horizontal viewing angle is still 50 degrees. In this way, on the original 2D camera structure, the previous image shooting method and total resolution are completely preserved. If the original camera design contains zoom and focus functions, these will not affect the effect of the device. Because the left and right images are horizontally compressed using the principle of optics, the total pixels, resolution, and aspect ratio of the composite image obtained on the original image sensor have not changed in any way, so the device does not need to change the original Any circuit and software design for 2D camera/video camera. The output and displayed images are also SIDE BY SIDE stereoscopic images. In stereoscopic restoration, if DOT BY DOT technology is adopted and a two-viewpoint grating stereoscopic display is used, the aspect ratio of the image will be restored to 4:3, and the aspect ratio of characters and scenes will be restored without loss of pixels. When using other display technologies, it is necessary to perform horizontal pixel interpolation on the left and right eye images. The invention is simple and easy to implement. When the stereo encoding and decoding technology is not popularized, the stereoscopic imaging can be completed by using the existing technology, but the disadvantage is that the horizontal resolution of the left and right eyes is sacrificed.

The device of the present invention must be connected or installed horizontally with the imaging lens assembly system 120 as shown in FIG. and ensure that the center of the device basically coincides with the center of the imaging surface to avoid asymmetry between the left and right images.

The contents introduced and described above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (10)

1. an optical stereo imaging device is characterized in that, comprising:

First optical imaging lens group (111,112) and the second optical imaging lens group (114,115) are used to simulate human eye and receive extraneous light and the relative in the horizontal direction vertical direction of image that enters is compressed one times;

First Amici prism (113) and second Amici prism (116), be respectively applied for and will reflect reflection from the light corresponding to first optical imaging lens group (111,112) and the second optical imaging lens group (114,115), described light through the superrefraction reflection forms two width of cloth images arranged side by side on imaging plane.

2. optical stereo imaging device according to claim 1 is characterized in that: the lateral separation scope between described first optical imaging lens group (111,112) and the second optical imaging lens group (114,115) is 40 to 100 millimeters.

3. optical stereo imaging device according to claim 1 is characterized in that: relative first prism of horizontal direction field angle (113) of described first optical imaging lens group (111,112) and the second optical imaging lens group (114,115) and second prism (116) are the twice relation.

4. optical stereo imaging device according to claim 1 is characterized in that: also comprise single lens group imaging system (121) and single image sensor (122).

5. optical stereo imaging device according to claim 4 is characterized in that: described single lens group imaging system (121) adopts the lens group of complete video camera or camera to realize.

6. optical stereo imaging device according to claim 4 is characterized in that: described single image sensor (122) is CCD or cmos image sensor.

7. a stereo camera shooting method is characterized in that, may further comprise the steps:

S1. two optical imaging lens groups simulations of horizontal installation arranged side by side human eyes receive extraneous lights and the relative in the horizontal direction vertical direction of image that enters are compressed one times;

S2. by two Amici prisms the extraneous light of two optical imaging lens group of received is reflected reflection;

S3. adopt single image sensor scioptics form as system the light that receives described two Amici prisms refraction and reflection on its imaging plane and form arranged side by side about two width of cloth images.

8. stereo camera shooting method according to claim 7 is characterized in that: the lateral separation scope among the described step S1 between two optical imaging lens groups is 40 to 100 millimeters.

9. stereo camera shooting method according to claim 7 is characterized in that: relative two prisms of the horizontal direction field angle of described two optical imaging lens groups are the twice relation, and are constant in vertical direction.

10. stereo camera shooting method according to claim 7 is characterized in that, described single image sensor is CCD or cmos image sensor.

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