Adjusting device and calibration method for naked-eye three-dimensional display system

Abstract

The application discloses a kind of adjusting device and calibration method of naked eye three-dimensional display system, belong to computer vision technical field.The adjusting device includes: flat-panel display, cylindrical lens grating, support mechanism, bottom plate, calibrator and multiple guide rails, the flat-panel display is vertically fixed on the top of bottom plate by support mechanism, the cylindrical lens grating is arranged in front of flat-panel display and covers entire flat-panel display, the cylindrical lens grating top and bottom are respectively fixedly connected with guide rail and fixed on bottom plate by the guide rail of its bottom, the guide rail of the cylindrical lens grating top is fixedly connected with support mechanism;The adjusting device connects cylindrical lens grating with flat-panel display by multiple high-precision guide rails, forms reliable " three top three pull " mechanism;Six degrees of freedom adjustment work is apportioned to hardware and software, so that hardware and software respectively realize three degrees of freedom adjustment function, reduce the design difficulty and cost of hardware and improve the efficiency and accuracy of entire system installation and adjustment.

Description

Technical Field

[0001] This invention belongs to the field of computer vision technology, specifically relating to an adjustment device and calibration method for a naked-eye 3D display system. Background Technology

[0002] For a long time, the acquisition of visual information about the displayed world has mainly relied on single-camera capture. However, this method of acquisition cannot provide the human eye with a sense of depth, stereoscopic effect, or a comprehensive understanding of objects. With the development of related disciplines and people's continuous pursuit of visual effects, three-dimensional (3D) display technology has emerged and rapidly become a new display mode that countries around the world are vigorously developing. In recent years, 3D display technology has been widely used in many fields such as film and entertainment, industrial production, medical and health care, science and education, and military defense.

[0003] Classified by implementation method, 3D display technology mainly includes wearable display technology and glasses-free display technology. Wearable display technology includes helmet display, shutter display, color separation display, and polarized display, while glasses-free display technology includes cylindrical lens display, slit display, integrated imaging display, holographic display, and volume display. Currently, cinemas widely use wearable display methods based on polarized display technology. This technology is easy to implement and low in cost. However, because this method transmits the images seen by the left and right eyes to the audience separately, it forces the audience to generate a stereoscopic effect in their brains, which can easily cause visual fatigue. Moreover, this technology cannot achieve continuous multi-view parallax changes, and the glasses worn by the audience bring many inconveniences. Therefore, glasses-free display technology has always been recognized by the industry as the future industrialization direction of 3D display technology.

[0004] Among numerous glasses-free display technologies, lenticular lens grating-based display technology is currently the most cost-effective and closest to industrialization. Based on the principle of spatial optical encoding and decoding, this technology combines high-precision optical imaging lenses with an image generator. According to human visual characteristics, it optically modulates the light projected by the image generator, ensuring that the effective light is accurately received by the viewer's eyes, thus presenting a full-color image with continuous parallax within a wide field of view. Only large-size displays can provide viewers with an immersive and visually impactful experience. Therefore, the size of a lenticular lens grating stereoscopic display system needs to be at least 100 inches. This places higher demands on the overall system setup and adjustment. If the relative position of the lenticular lens grating and the flat panel display cannot be precisely adjusted to the optimal imaging position, or if the system's calibration parameters cannot be accurately obtained, it will directly lead to deterioration of the display effect, such as moiré patterns and crosstalk, causing visual discomfort to viewers and seriously hindering the widespread application of the technology. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustment device and calibration method for a naked-eye 3D display system, thereby achieving reliability and accuracy in the assembly and adjustment of large-size cylindrical grating naked-eye 3D display systems of 100 inches and above.

[0006] To achieve the above objectives, the present invention first provides an adjustment device for a naked-eye 3D display system, the specific technical solution of which is as follows:

[0007] An adjustment device for a naked-eye 3D display system includes: a flat panel display, a lenticular lens grating, a support mechanism, a base plate, a calibrator, and multiple guide rails. The flat panel display is vertically fixed above the base plate by the support mechanism. The lenticular lens grating is arranged in front of the flat panel display and covers the entire flat panel display. A pair of guide rails are fixedly connected to the bottom of the lenticular lens grating and fixed to the base plate by the guide rails at its bottom. At least one guide rail is fixed to the top of the lenticular lens grating and its top guide rail is connected to the support mechanism. By adjusting the guide rails, the lenticular lens grating can be translated in a direction perpendicular to the plane of the flat panel display and rotated around the horizontal and vertical edges of the flat panel display.

[0008] The calibrator includes: camera 0, camera 1, camera 2, camera 3, and a slide rail. Cameras 0, 1, 2, and 3 are mounted on the slide rail via sliding blocks. The sliding blocks allow cameras 0, 1, 2, and 3 to slide freely along the slide rail and their positions can be read at any time. The optical axes of cameras 0, 1, 2, and 3 are parallel to each other and perpendicular to the slide rail. Cameras 0, 1, 2, and 3 are each connected to a computer.

[0009] In addition, the present invention also provides a calibration method for the adjustment device of a naked-eye 3D display system, specifically including the following steps:

[0010] Step 1: Adjust the plane of the flat panel display to be parallel to the plane of the lenticular lens grating.

[0011] First, adjust all the guide rails connecting the lenticular lens grating to make the lenticular lens grating fit against the flat panel display. Use a feeler gauge to measure and ensure that the distances from the four corner points of the lenticular lens grating to the flat panel display are the same. Then, adjust all the guide rails synchronously to move the lenticular lens grating away from the flat panel display. The moving distance is the theoretical value of the focal length of the lenticular lens grating.

[0012] Step 2: Setting up the calibrator

[0013] Adjust the positions of the four color cameras (camera 0, camera 1, camera 2, and camera 3) on the calibrator so that the distance between camera 0 and camera 1 is equal to the interocular distance of the human eye, the distance between camera 2 and camera 3 is equal to the interocular distance of the human eye, and the distance between camera 0 and camera 3 is the width of a single field of view. Place the calibrator in front of the lenticular lens grating, with the distance from the calibrator to the lenticular lens grating being the viewing distance of the naked-eye 3D display system. The midpoint of the line connecting camera 0 and camera 3 is located on the central axis of the flat panel display. Use the four color cameras on the calibrator to capture the pattern on the lenticular lens grating in real time and display it on the computer.

[0014] Step 3: Initialize the calibration image

[0015] Two monochrome test images of size W×H are generated by selecting any two colors from red, green, and blue, where W is the image width of the flat panel display and H is the image height of the flat panel display. The first test image is of one color, and the second test image is of another color. According to the pixel mapping method, the starting viewpoint number S is set to 0, and the number of pixels covered by a single lenticular lens in the lenticular grating and the tilt angle are set to theoretical values ​​to generate a pixel mapping table. Using the pixel mapping table, the two monochrome test images are mapped into calibration images and displayed on the flat panel display. Let the maximum value in the pixel mapping table be N. Then, during the mapping process, the 0th to (N+1) / 2-1th viewpoint images are all the first test image, and the (N+1) / 2th to Nth viewpoint images are all the second test images.

[0016] Step 4: Adjust the distance between the flat panel display plane and the lenticular lens plane.

[0017] Synchronously adjust all guide rails connected to the lenticular lens grating to move the lenticular lens grating away from the flat panel display. Observe the lenticular lens grating patterns captured by camera 0 and camera 3. When the lenticular lens grating patterns captured by camera 0 and camera 3 are exactly the same, stop adjusting the guide rails.

[0018] Step 5: Coarsely calibrate the number of pixels covered and the tilt angle of a single lenticular lens in the lenticular grating.

[0019] Modify the two parameters of the number of pixels covered by a single lenticular lens and the tilt angle in the lenticular lens grating, and regenerate and display the calibration image according to the pixel mapping method in step three. Observe the lenticular lens grating patterns in the four color cameras of the calibrator. When the lenticular lens grating patterns in at least two cameras become solid colors, stop adjusting the parameters.

[0020] Step Six: Number the Starting Viewpoint

[0021] Modify the value of the starting viewpoint number S, and regenerate and display the calibration image according to the pixel mapping method in step three. When the lenticular grating pattern in camera zero becomes a solid color and is the color of the second test image, and the lenticular grating pattern in camera three becomes a solid color and is the color of the first test image, stop modifying the starting viewpoint number S. At this time, the value of S is the final starting viewpoint number.

[0022] Step 7: Fine-calibrate the number of pixels covered and the tilt angle of a single lenticular lens in the lenticular grating.

[0023] Modify the two parameters of the number of pixels covered by a single lenticular lens in the lenticular grating and the tilt angle, and regenerate and display the calibration image according to the pixel mapping method in step three. Observe the lenticular grating patterns in the four color cameras in the calibrator. When the lenticular grating patterns in cameras zero and one of the calibrator become solid colors and are the same as the color of the second test image, and the lenticular grating patterns in cameras two and three become solid colors and are the same as the color of the first test image, stop adjusting the parameters. At this time, the final number of pixels covered by a single lenticular lens and the tilt angle in the lenticular grating are obtained.

[0024] Furthermore, the pixel mapping method includes the following steps: the image displayed on the flat panel display is calculated from multiple viewpoint images through pixel mapping. Before pixel mapping, a pixel mapping table needs to be created. The pixel mapping table is a W×H two-dimensional matrix, and the pixel mapping formula is:

[0025] I(i,j)=V M(i,j) (i,j)

[0026] In the formula, I(i,j) represents the pixel in the i-th row and j-th column of the image displayed on the flat panel display, M(i,j) represents the value in the i-th row and j-th column of the pixel mapping table, and V... M(i,j) V represents the M(i,j)th viewpoint image. M(i,j) (i,j) represents the pixel in the i-th row and j-th column of the M-th viewpoint image, where the value of i ranges from 0 to (H-1) and the value of j ranges from 0 to (W-1).

[0027] The pixel mapping table is obtained as follows: First, calculate the horizontal distance from the center of each pixel on the flat panel display to the central axis of the lenticular lens covering it. When the pixel is to the left of the lenticular lens's central axis, the horizontal distance is negative; when the pixel is to the right of the lenticular lens's central axis, the horizontal distance is positive. Then, arrange all distances in ascending order. Finally, generate the pixel mapping table based on the sequence number of each pixel's distance. The specific formula is as follows:

[0028] M(i,j)=O(i,j)+S

[0029] In the formula, O(i,j) is the distance sorting index of the pixel in the i-th row and j-th column on the flat panel display, and S is the starting viewpoint number.

[0030] Beneficial effects of the present invention

[0031] This invention provides an adjustment device and calibration method for a naked-eye 3D display system. Compared with existing technologies, this invention can reliably connect a large-size lenticular lens grating to a flat panel display. Using a calibrator, it achieves precise positioning of the lenticular lens grating and the flat panel display in six degrees of freedom through simultaneous software and hardware adjustments. Compared with the assembly and adjustment mechanisms of ordinary experimental platforms, this invention, tailored to the needs of large-size naked-eye 3D display systems, fully considers the influence of factors such as gravity and effectively balances the adjustment difficulty of software and hardware by adopting a "three-top, three-pull" connection mechanism, thereby improving system reliability and reducing hardware complexity. Traditional calibration methods rely on direct observation of the lenticular lens grating pattern by the human eye, which introduces uncertainties in observation position and visual effects, especially in large-size display systems. This invention uses a standard camera and a fixed-position calibrator, greatly improving the accuracy of calibration parameters. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the naked-eye 3D display system provided by the present invention.

[0033] In the diagram, 1. Flat panel display; 2. Cylindrical grating; 3. Support mechanism; 4. Guide rail; 5. Base plate; 6. Calibrator; 7. Camera 0; 8. Camera 1; 9. Camera 2; 10. Camera 3; 11. Sliding rail; 12. Computer. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] It should be noted that the terms "upper," "bottom," "side," etc., used herein indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of describing the present invention and simplifying the description. Similar expressions are only for illustrative purposes and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. In addition, the terms "one section" and "two sections" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] See Figure 1As shown, the present invention first provides an adjustment device for a naked-eye 3D display system. This adjustment device includes: a flat panel display 1, a lenticular lens grating 2, a support mechanism 3, a base plate 5, a calibrator 6, and multiple guide rails 4. The flat panel display 1 is vertically fixed above the base plate 5 via the support mechanism 3. The lenticular lens grating 2 is arranged directly in front of the flat panel display 1 and covers the entire flat panel display 1. A pair of guide rails 4 are fixedly connected to the bottom of the lenticular lens grating 2 and fixed to the base plate 5 via the bottom guide rails 4. A pair of guide rails 4 are fixed to the top of the lenticular lens grating 2, and the top guide rails 4 are connected to the support mechanism 3. Adjusting the guide rails 4 allows the lenticular lens grating 2 to translate in a direction perpendicular to the plane of the flat panel display 1 and rotate around the horizontal and vertical edges of the flat panel display 1. Specifically, by simultaneously adjusting a pair of guide rails 4 at the top of the lenticular lens grating 2 or simultaneously adjusting a pair of guide rails 4 at the bottom of the lenticular lens grating 2, the lenticular lens grating 2 can rotate along the horizontal edge of the flat panel display 1. By simultaneously adjusting the guide rails 4 on the same side of the upper and lower surfaces of the lenticular lens grating 2, the lenticular lens grating 2 can rotate along the vertical edge of the flat panel display 1. Simultaneously adjusting all guide rails 4 allows the lenticular lens grating 2 to move away from or closer to the flat panel display 1.

[0037] The calibrator 6 includes: a zero camera 7, a first camera 8, a second camera 9, a third camera 10, and a slide rail 11. The zero camera 7, the first camera 8, the second camera 9, and the third camera 10 are mounted on the slide rail 11 via sliding seats. The sliding seats allow the zero camera 7, the first camera 8, the second camera 9, and the third camera 10 to slide freely along the slide rail 11 and their positions can be read at any time. Specifically, the slide rail has scales, and the camera positions are determined by reading the position of the sliding seats on the slide rail. The optical axes of the zero camera 7, the first camera 8, the second camera 9, and the third camera 10 are parallel to each other and perpendicular to the direction of the slide rail. The zero camera 7, the first camera 8, the second camera 9, and the third camera 10 are each connected to the computer 12.

[0038] In addition, the present invention also provides a calibration method for the adjustment device of a naked-eye 3D display system, the calibration method comprising the following steps:

[0039] Step 1: Adjust the plane of the flat panel display 1 to be parallel to the plane of the lenticular lens grating 2.

[0040] First, adjust all the guide rails 4 connecting the cylindrical lens grating 2 so that the cylindrical lens grating 2 is in contact with the flat panel display 1. Use a feeler gauge to measure and ensure that the distance from the four corner points of the cylindrical lens grating 2 to the flat panel display 1 is the same. Then, adjust all the guide rails 4 synchronously so that the cylindrical lens grating 2 moves away from the flat panel display 1. The moving distance is the theoretical value of the focal length of the cylindrical lens grating.

[0041] Step 2: Setting up the calibrator

[0042] Adjust the positions of the four color cameras (camera 7, 8, 9, and 10) on the calibrator so that the distance between camera 7 and 8 is equal to the interocular distance of the human eye, the distance between camera 9 and 10 is equal to the interocular distance of the human eye, and the distance between camera 7 and 10 is the width of a single field of view. Place the calibrator 6 in front of the lenticular lens 2, with the distance between the calibrator 6 and the lenticular lens 2 being the viewing distance of the naked-eye 3D display system. The midpoint of the line connecting camera 7 and 10 is located on the central axis of the flat panel display 1. Use the four color cameras on the calibrator 6 to capture the pattern on the lenticular lens 2 in real time and display it on the computer 12.

[0043] Step 3: Initialize the calibration image

[0044] Two monochrome test images of size W×H are generated by selecting any two colors from red, green, and blue, where W is the image width of the flat panel display and H is the image height of the flat panel display. The first test image is of one color, and the second test image is of another color. According to the pixel mapping method, the starting viewpoint number S is set to 0, and the number of pixels covered by a single lenticular lens in the lenticular lens grating 2 and the tilt angle are set to theoretical values ​​to generate a pixel mapping table. Using the pixel mapping table, the two monochrome test images are mapped into calibration images and displayed on the flat panel display 1. Let the maximum value in the pixel mapping table be N. Then, during the mapping process, the 0th to (N+1) / 2-1th viewpoint images are all the first test images, and the (N+1) / 2th to Nth viewpoint images are all the second test images.

[0045] Furthermore, the pixel mapping method includes the following steps: the image displayed on the flat panel display 1 is calculated from multiple viewpoint images through pixel mapping. Before pixel mapping, a pixel mapping table needs to be created. The pixel mapping table is a W×H two-dimensional matrix, and the pixel mapping formula is:

[0046] I(i,j)=V M(i,j) (i,j)

[0047] In the formula, I(i,j) represents the pixel in the i-th row and j-th column of the image displayed on the flat panel display, M(i,j) represents the value in the i-th row and j-th column of the pixel mapping table, and V... M(i,j) V represents the M(i,j)th viewpoint image. M(i,j) (i,j) represents the pixel in the i-th row and j-th column of the M-th viewpoint image, where the value of i ranges from 0 to H-1 and the value of j ranges from 0 to W-1.

[0048] The pixel mapping table is obtained as follows: First, calculate the horizontal distance from the center of each pixel on the flat panel display 1 to the central axis of the lenticular lens covering it. When the pixel is located to the left of the central axis of the lenticular lens, the horizontal distance is negative; when the pixel is located to the right of the central axis of the lenticular lens, the horizontal distance is positive. Then, arrange all distances in ascending order. Finally, generate the pixel mapping table based on the sequence number of each pixel's distance. The specific formula is as follows:

[0049] M(i,j)=O(i,j)+S

[0050] In the formula, O(i,j) is the distance sorting index of the pixel in the i-th row and j-th column on the flat panel display, and S is the starting viewpoint number.

[0051] Step 4: Adjust the distance between plane 1 of the flat panel display and plane 2 of the lenticular lens grating.

[0052] Synchronously adjust all guide rails 4 connected to the lenticular lens grating 2, so that the lenticular lens grating 2 moves away from the flat panel display 1, and observe the lenticular lens grating patterns collected by camera 0 and camera 3. When the lenticular lens grating patterns collected by camera 0 and camera 3 are exactly the same, stop adjusting the guide rails 4.

[0053] Step 5: Coarsely calibrate the number of pixels covered and the tilt angle of a single lenticular lens in lenticular grating 2.

[0054] Modify the two parameters of the number of pixels covered by a single lenticular lens and the tilt angle in the lenticular lens grating 2, and regenerate and display the calibration image according to the pixel mapping method in step three. Observe the lenticular lens grating patterns in the four color cameras of the calibrator 6. When the lenticular lens grating patterns in at least two cameras become solid colors, stop the parameter adjustment.

[0055] Step Six: Number the Starting Viewpoint

[0056] Modify the value of the starting viewpoint number S, and regenerate and display the calibration image according to the pixel mapping method in step three. When the lenticular grating pattern in camera 7 becomes a solid color and is the color of the second test image, and the lenticular grating pattern in camera 10 becomes a solid color and is the color of the first test image, stop modifying the starting viewpoint number S. At this time, the value of S is the final starting viewpoint number.

[0057] Step 7: Fine-calibrate the number of pixels covered and the tilt angle of a single lenticular lens in lenticular grating 2.

[0058] Modify the two parameters of the number of pixels covered by a single lenticular lens in the lenticular lens grating 2 and the tilt angle, and regenerate and display the calibration image according to the pixel mapping method in step 3. Observe the lenticular lens grating patterns in the four color cameras in the calibrator 6. When the lenticular lens grating patterns in camera 0 and camera 1 of the calibrator become solid colors and are the same as the color of the second test image, and the lenticular lens grating patterns in camera 2 and camera 3 become solid colors and are the same as the color of the first test image, stop the parameter adjustment. At this time, the number of pixels covered by a single lenticular lens and the tilt angle in the final lenticular lens grating are obtained.

[0059] This invention proposes an adjustment device and calibration method for a naked-eye 3D display system. The cylindrical lens grating 2 and the flat panel display 1 are connected via multiple high-precision guide rails 4, forming a reliable "three-top, three-pull" mechanism. The adjustment work of the six degrees of freedom is distributed between hardware and software, enabling each to perform adjustment functions of three degrees of freedom, significantly reducing the design difficulty and cost of the hardware. Simultaneously, this invention innovatively develops a calibrator 6 and a corresponding calibration method, effectively decomposing the correlation between various physical quantities and designing multiple targeted quantitative testing steps to achieve independent calibration of each physical quantity, greatly improving the efficiency and accuracy of the entire system assembly and adjustment.

[0060] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An adjustment device for a naked-eye 3D display system, characterized in that, The adjustment device includes: a flat panel display (1), a lenticular lens grating (2), a support mechanism (3), a base plate (5), a calibrator (6), and multiple guide rails (4). The flat panel display (1) is vertically fixed above the base plate (5) by the support mechanism (3). The lenticular lens grating (2) is arranged in front of the flat panel display (1) and covers the entire flat panel display (1). A pair of guide rails (4) are fixedly connected to the bottom of the lenticular lens grating (2) and fixed to the base plate (5) by the guide rails (4) at its bottom. At least one guide rail (4) is fixed to the top of the lenticular lens grating (2) and the guide rail (4) at its top is connected to the support mechanism (3). By adjusting the guide rails (4), the lenticular lens grating (2) can be translated in a direction perpendicular to the plane of the flat panel display (1) and rotated around the horizontal and vertical edges of the flat panel display (1). The calibrator (6) includes: a zero camera (7), a first camera (8), a second camera (9), a third camera (10), and a slide rail (11). The zero camera (7), the first camera (8), the second camera (9), and the third camera (10) are mounted on the slide rail (11) via sliding seats. The sliding seats allow the zero camera (7), the first camera (8), the second camera (9), and the third camera (10) to slide freely along the slide rail (11) and their positions can be read at any time. The optical axes of the zero camera (7), the first camera (8), the second camera (9), and the third camera (10) are parallel to each other and perpendicular to the slide rail direction. The zero camera (7), the first camera (8), the second camera (9), and the third camera (10) are respectively connected to a computer (12).

2. A calibration method for an adjustment device of a naked-eye 3D display system, characterized in that, The calibration method includes the following steps: Step 1: Adjust the plane of the flat panel display (1) to be parallel to the plane of the lenticular lens grating (2). First, adjust all the guide rails (4) connecting the cylindrical lens grating (2) so that the cylindrical lens grating (2) fits against the flat panel display (1). Use a feeler gauge to measure and ensure that the distance from the four corner points of the cylindrical lens grating (2) to the flat panel display (1) is the same. Then, adjust all the guide rails (4) synchronously so that the cylindrical lens grating (2) moves away from the flat panel display (1). The moving distance is the theoretical value of the focal length of the cylindrical lens grating. Step 2: Setting up the calibrator Adjust the positions of the four color cameras on the calibrator: camera 0 (7), camera 1 (8), camera 2 (9), and camera 3 (10), so that the distance between camera 0 (7) and camera 1 (8) is equal to the interocular distance of the human eye, the distance between camera 2 (9) and camera 3 (10) is equal to the interocular distance of the human eye, and the distance between camera 0 (7) and camera 3 (10) is the width of a single field of view. Place the calibrator (6) in front of the lenticular grating (2), and the distance from the calibrator (6) to the lenticular grating (2) is the viewing distance of the naked-eye 3D display system. The midpoint of the line connecting camera 0 (7) and camera 3 (10) is located on the central axis of the flat panel display (1). Use the four color cameras on the calibrator (6) to collect the pattern on the lenticular grating (2) in real time and display it on the computer (12). Step 3: Initialize the calibration image Two colors are selected from red, green, and blue to generate two monochrome test images of size W×H, where W is the image width of the flat panel display and H is the image height of the flat panel display. The first test image is of one color and the second test image is of another color. According to the pixel mapping method, the starting viewpoint number S is set to 0, and the number of pixels covered by a single lenticular lens in the lenticular lens grating (2) and the tilt angle are set to theoretical values ​​to generate a pixel mapping table. Using the pixel mapping table, the two monochrome test images are mapped into calibration images and displayed on the flat panel display (1). If the maximum value of the pixel mapping table is N, then during the mapping process, the 0th to (N+1) / 2-1th viewpoint images are all the first test images, and the (N+1) / 2th to Nth viewpoint images are all the second test images. Step 4: Adjust the distance between the plane of the flat panel display (1) and the plane of the lenticular lens grating (2). Synchronously adjust all guide rails (4) connecting the cylindrical lens grating (2) to make the cylindrical lens grating (2) move away from the flat panel display (1) and observe the cylindrical lens grating patterns collected by camera 0 (7) and camera 3 (10). When the cylindrical lens grating patterns collected by camera 0 (7) and camera 3 (10) are exactly the same, stop adjusting the guide rails (4). Step 5: Coarsely calibrate the number of pixels covered and the tilt angle of a single lenticular lens in the lenticular grating (2). Modify the two parameters of the number of pixels covered by a single lenticular lens and the tilt angle in the lenticular lens grating (2), and regenerate and display the calibration image according to the pixel mapping method in step three. Observe the lenticular lens grating patterns in the four color cameras of the calibrator (6). When the lenticular lens grating patterns in at least two cameras become solid colors, stop adjusting the parameters. Step Six: Number the Starting Viewpoint Modify the value of the starting viewpoint number S, and regenerate and display the calibration image according to the pixel mapping method in step three. When the lenticular grating pattern in camera 0 (7) becomes a solid color and is the color of the second test image, and the lenticular grating pattern in camera 3 (10) becomes a solid color and is the color of the first test image, stop modifying the starting viewpoint number S. At this time, the value of S is the final starting viewpoint number. Step 7: Finely calibrate the number of pixels covered and the tilt angle of a single lenticular lens in the lenticular grating (2). Modify the two parameters of the number of pixels covered by a single lenticular lens and the tilt angle in the lenticular lens grating (2), and regenerate and display the calibration image according to the pixel mapping method in step three. Observe the lenticular lens grating patterns in the four color cameras in the calibrator (6). When the lenticular lens grating patterns in camera 0 (7) and camera 1 (8) of the calibrator become solid colors and are the color of the second test image, and the lenticular lens grating patterns in camera 2 (9) and camera 3 (10) become solid colors and are the color of the first test image, stop adjusting the parameters. At this time, obtain the number of pixels covered by a single lenticular lens and the tilt angle in the final lenticular lens grating.

3. The calibration method for the adjustment device of a naked-eye 3D display system according to claim 2, characterized in that, The pixel mapping method includes the following steps: the image displayed on the flat panel display (1) is calculated from multiple viewpoint images through pixel mapping. Before pixel mapping, a pixel mapping table needs to be created. The pixel mapping table is a two-dimensional matrix of W×H, and the pixel mapping formula is: I(i,j)=V M(i,j) (i,j) In the formula, I(i,j) represents the pixel in the i-th row and j-th column of the image displayed on the flat panel display, M(i,j) represents the value in the i-th row and j-th column of the pixel mapping table, and V... M(i,j) V represents the M(i,j)th viewpoint image. M(i,j) (i,j) represents the pixel in the i-th row and j-th column of the M-th viewpoint image, where the value of i ranges from 0 to (H-1) and the value of j ranges from 0 to (W-1). The method for obtaining the pixel mapping table is as follows: First, calculate the horizontal distance from the center of each pixel on the flat panel display (1) to the central axis of the cylindrical lens covering it. When the pixel is located to the left of the central axis of the cylindrical lens, the horizontal distance is negative; when the pixel is located to the right of the central axis of the cylindrical lens, the horizontal distance is positive. Then, arrange all distances in ascending order. Finally, generate the pixel mapping table by arranging the serial numbers according to the distance of each pixel. The specific formula is as follows: M(i,j)=O(i,j)+S In the formula, O(i,j) is the distance sorting index of the pixel in the i-th row and j-th column on the flat panel display, and S is the starting viewpoint number.

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