Method for manufacturing image correction optical lens for vehicle-mounted camera

Abstract

The application discloses a method for manufacturing image correction optical lens of vehicle-mounted camera. The method comprises the following steps: pre-constructing optical convex lens of up-down structure, optical convex lens of horizontal structure and optical convex lens of diagonal line structure; constructing a basic camera and combining the parameters of the optical convex lens of up-down structure, the optical convex lens of horizontal structure and the optical convex lens of diagonal line structure obtained by the basic camera to generate a first curved surface mixed optical lens and obtain a correction optical camera; constructing a front-moving magnification basic camera, replacing the basic camera with the front-moving magnification basic camera, repeating the foregoing steps, generating a second curved surface mixed optical lens and obtaining a front-moving magnification correction optical camera. The application realizes optical lens correction of image distortion, saves time for software correction of image distortion, improves electronic rearview mirror CMS, reduces system delay, guarantees real-time characteristics of the electronic rearview mirror, and also saves software programming and operation time.

Description

Technical Field

[0001] This invention relates to the fields of optics, electronics, and mechanical manufacturing, and in particular to a method for manufacturing an image correction optical lens for a vehicle-mounted camera. Background Technology

[0002] In typical automotive rearview mirrors, the camera lens exhibits image distortion, meaning the image appears warped to some extent. This distortion is particularly noticeable when using a wide-angle lens, with the warping increasing from the center outwards. The problem stems from the fact that the camera's optical lens has a fixed magnification. This magnification changes with the angle between the beam and the principal axis. According to optical imaging principles, this results in image distortion, a physical characteristic of optical lenses. The direct cause is the difference in magnification between the edge and center of the lens. The following invention patents all contain image distortion correction or compensation technologies: CN202011412713.0 Method, device, equipment and storage medium for distortion correction of vehicle-mounted fisheye camera; CN201910435044.X Method, system and medium for camera distortion correction based on B-spline surface fitting; CN201510514238.0 A method for accurately correcting image distortion of ultra-wide-angle camera; CN201820856836.5 A car panoramic camera lens with small image distortion; CN201810403187.8 Image distortion correction method and device, computer-readable medium and electronic device; CN201510977380.9 Method for eliminating image distortion in augmented reality integrated imaging 3D display. However, all of them adopt symmetrical structures or lens designs using rotating structures. For CMOS image sensors with rectangular windows, this does not fundamentally solve the problem of the magnification ratio of the length × width rectangle, and further inventions are needed to achieve this. Typically, in images captured by wide-angle devices, the closer the central portion is to the center of the image circle, the greater the magnification; conversely, the farther the top and bottom portions are from the center, the smaller the magnification, resulting in image distortion. Current technologies often employ software-based image correction methods. For wide-angle lenses and lenses with large field-of-view lenses, software performs calculations on the image to correct distortion. However, the software calculations and image information storage consume significant time, severely impacting the time delay of electronic rearview mirrors. Therefore, software-based image distortion correction methods face the technical challenge of time delay. Summary of the Invention

[0003] This invention provides a method for manufacturing an optical lens with image correction function, which realizes the optical lens to correct image distortion, saves the time of software to correct image distortion, improves the CMS of electronic rearview mirror, reduces system latency, ensures the real-time characteristics of electronic rearview mirror, and also saves software programming and calculation time.

[0004] The objective of this invention is achieved by at least one of the following technical solutions.

[0005] The method for manufacturing an image correction optical lens for a vehicle-mounted camera includes the following steps:

[0006] S1, pre-constructed optical convex lenses with upper and lower structures, horizontal structures, and diagonal structures;

[0007] S2. Construct a basic camera and standard images, and mark the reference points and standard points in the standard images;

[0008] S3. Construct a first corrective camera based on an optical convex lens with an upper and lower structure, a second corrective camera based on an optical convex lens with a horizontal structure, and a third corrective camera based on an optical convex lens with a diagonal structure, based on the basic camera.

[0009] S4. Adjust the parameters of the upper and lower structure optical convex lens, the horizontal structure optical convex lens, and the diagonal structure optical convex lens according to the standard image.

[0010] S5. Based on the parameters of the upper and lower structure optical convex lens, the horizontal structure optical convex lens and the diagonal structure optical convex lens obtained in step S4, generate the first curved surface hybrid optical lens to obtain the corrective optical camera.

[0011] S6. Construct a forward-shifting magnified base camera, replace the base camera with a forward-shifting magnified base camera, repeat steps S3 to S5, generate a second curved surface mixed composition optical lens, and obtain a forward-shifting magnified optical camera.

[0012] Further, in step S1, a rectangular coordinate system is set with the origin at point O, and the line connecting point O and point A0 is set as the Y-axis;

[0013] Set points B1, C1, D1 and E1, points O, A0, B1, C1, D1 and E1 are located in the same plane, and the line connecting points O and E1 is perpendicular to the Y-axis. Points O, A0, B1, C1, D1 and E1 are connected in sequence to form the first section. The first section is rotated 360 degrees around the Y-axis to obtain an optical convex lens with an upper and lower structure.

[0014] Set points B2, C2, D2, E2, and F2. Points O, A0, B2, C2, D2, E2, and F2 are located in the same plane, and the line connecting points O and F2 is perpendicular to the Y-axis. Points O, A0, B2, C2, D2, E2, and F2 are connected sequentially to form a second section. The second section is rotated 360 degrees around the Y-axis to obtain a horizontal optical convex lens.

[0015] Set points B3, C3, D3, E3, and F3. Points O, A0, B3, C3, D3, E3, and F3 are located in the same plane, and the line connecting points O and F3 is perpendicular to the Y-axis. Points O, A0, B3, C3, D3, E3, and F3 are connected sequentially to form a third section. The third section is rotated 360 degrees around the Y-axis to obtain a diagonal optical convex lens.

[0016] Furthermore, in step S2, the basic camera includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a CMOS image sensor arranged sequentially from the object side to the image side;

[0017] Among them, the first lens is a lens with a convex object side and a concave image side, and the radius of curvature of the convex surface of the first lens is greater than 1.2 meters; the second lens is a biconvex lens, the third lens is a biconvex lens, the fourth lens is a biconcave lens, the third lens and the fourth lens form a cemented lens, and the fifth lens is a concave-convex lens with a concave object side and a convex image side.

[0018] The standard image is constructed as a rectangular frame, corresponding to the length × width dimensions of the CMOS image sensor (506). The reference point a is set at the center of the rectangular frame. The center line parallel to the long side of the rectangular frame is set as the horizontal symmetry line, and the center line parallel to the short side of the rectangular frame is set as the vertical symmetry line. From the center outward, points a, b, c, and d are set in sequence on the horizontal symmetry line, points a, e, and f are set in sequence on the vertical symmetry line, and points g, h, and i are set in sequence on the diagonal of the rectangle. Points b, c, d, e, f, g, h, and i are all standard points.

[0019] Further, in step S3, the fifth lens (502) in the basic camera constructed in step S2 is replaced by the optical convex lens with the upper and lower structure, the optical convex lens with the horizontal structure, and the optical convex lens with the diagonal structure pre-constructed in step S1, respectively. The remaining components in the basic camera remain unchanged, thus forming a first corrective camera based on the optical convex lens with the upper and lower structure, a second corrective camera based on the optical convex lens with the horizontal structure, and a third corrective camera based on the optical convex lens with the diagonal structure.

[0020] Further, in step S4, according to ISO 16505 Road Vehicles—Ergonomics and performance aspects of camera monitoring systems—Requirements and test procedures, the magnification of the first corrected camera based on the upper and lower optical convex lenses is set to 0.3464 when the imaging distance is 20 meters. The magnification of the upper and lower structures of the camera lens group is adjusted as follows:

[0021] A first corrective camera based on an optical convex lens with an upper and lower structure is used to image a standard image to obtain a first image. The standard points e and f in the standard image are imaged by the first corrective camera based on an optical convex lens with an upper and lower structure, and correspond to the moving points e' and f' in the first image.

[0022] Adjust the radius of curvature formed by points A0, B1, C1, and D1, i.e., increase the magnification of the optical convex lens based on the upper and lower structure, so that point e coincides with point e'. Record the value of the radius of curvature at point B1, which is the radius of curvature data D at point B1. B1 ;

[0023] Adjust the radius of curvature formed by points A0, B1, C1, and D1, i.e., increase the magnification of the optical convex lens based on the upper and lower structure, so that point f coincides with point f'. Record the value of the radius of curvature at point C1, which is the radius of curvature data D at point C1. C1 ;

[0024] Adjust the radius of curvature formed by points A0, B1, C1, and D1, i.e., increase the magnification of the optical convex lens based on the upper and lower structure. Simultaneously, ensure that points e and e' coincide, and points f and f' coincide. Adjust the value of point D1 so that the standard image and the first imaging image coincide at the edge along the vertical line of symmetry. Record the value of point D1 in the radius of curvature; this is the radius of curvature data D1. D1 ;

[0025] Obtain the corrected data A0 and D B1 D C1 and D D1 Thus, we obtain A0 and D B1 D C1 and D D1 The first corrective radius of curvature formed;

[0026] According to ISO 16505 Road vehicles—Ergonomics and performance aspects of camera surveillance systems—Requirements and test procedures, the magnification of the second corrected camera with a horizontally structured optical convex lens is set to 0.3464 at an imaging distance of 20 meters. The magnification of the horizontal structure of the camera lens group is adjusted as follows:

[0027] A second corrective camera based on a horizontally structured optical convex lens is used to image a standard image to obtain a second image. Standard points b, c, and d in the standard image are imaged by the second corrective camera based on a horizontally structured optical convex lens, corresponding to moving points b', c', and d' in the second image.

[0028] Adjust the radius of curvature formed by points A0, B2, C2, D2, and E2, i.e., increase the magnification of the horizontally structured optical convex lens, so that point b coincides with point b'. Record the value of the radius of curvature at point B2, which is the radius of curvature data D for point B2. B2 ;

[0029] Adjust the radius of curvature formed by points A0, B2, C2, D2, and E2, i.e., increase the magnification of the horizontally structured optical convex lens, so that point c coincides with point c'. Record the value of the radius of curvature at point C2, which is the radius of curvature data D for point C2. C2 ;

[0030] Adjust the radius of curvature formed by points A0, B2, C2, D2, and E2, i.e., increase the magnification of the horizontally structured optical convex lens, so that point d coincides with point d'. Record the value of the radius of curvature at point D2, which is the radius of curvature data at point D2. D2 ;

[0031] Adjust the radius of curvature formed by points A0, B2, C2, D2, and E2, i.e., increase the magnification of the horizontally structured optical convex lens. Simultaneously, ensure that points b and b', c and c', and d and d' coincide. Adjust the value of point E2 so that the standard image and the second imaging image coincide at the edge along the horizontal line of symmetry. Record the value of point E2 in the radius of curvature, which is the radius of curvature data D for point E2. E2 ;

[0032] Obtain the corrected data A0 and D B2 D C2 D D2 and D E2 Thus, we obtain A0 and D B2 D C2 D D2 and D E2 The second corrected radius of curvature is formed;

[0033] According to ISO 16505 Road vehicles—Ergonomics and performance aspects of camera surveillance systems—Requirements and test procedures, the magnification of the third corrected camera with a diagonal optical convex lens is set to 0.3464 at an imaging distance of 20 meters. The magnification of the camera lens group with the diagonal structure is adjusted as follows:

[0034] A third corrective camera based on a diagonal optical convex lens is used to image the standard image to obtain a third imaging image. The standard points g, h and i in the standard image are imaged by the third corrective camera based on a diagonal optical convex lens and correspond to the moving points g', h' and i' in the third imaging image.

[0035] Adjust the radius of curvature formed by points A0, B3, C3, D3, and E3, i.e., increase the magnification of the optical convex lens based on the diagonal structure, so that point g coincides with point g'. Record the value of the radius of curvature at point B3, which is the radius of curvature data D at point B3. B3 ;

[0036] Adjust the radius of curvature formed by points A0, B3, C3, D3, and E3, i.e., increase the magnification of the optical convex lens based on the diagonal structure, so that point h coincides with point h'. Record the value of the radius of curvature at point C3, which is the radius of curvature data D at point C3. C3 ;

[0037] Adjust the radius of curvature formed by points A0, B3, C3, D3, and E3, i.e., increase the magnification of the convex lens based on the diagonal structure, so that point i coincides with point i'. Record the value of the radius of curvature at point D3, which is the radius of curvature data D3. D3 ;

[0038] Adjust the radius of curvature formed by points A0, B3, C3, D3, and E3, i.e., increase the magnification of the optical convex lens based on the diagonal structure. Simultaneously, ensure that points g and g', h and h', and i and i' coincide. Adjust the value of point E3 so that the standard image and the third imaging image coincide at the edges along the diagonal direction. Record the value of point E3 in the radius of curvature, which is the radius of curvature data D for point E3. E3 ;

[0039] Obtain the corrected data A0 and D B3 D C3 and E E3 Composed of A0 and D, thus obtaining B3 D C3 and E E3 The third corrected radius of curvature is formed.

[0040] Further, in step S5, based on the rectangular coordinate system, a horizontal section, a vertical section, and two diagonal sections are set at the center point O of the optical lens formed by the first surface mixing. The horizontal section is perpendicular to the vertical section, and the two diagonal sections are perpendicular to each other, and each of them bisects the right angle formed by the horizontal section and the vertical section equally.

[0041] The horizontal section is divided into a first horizontal section and a second horizontal section that are symmetrical about the Y-axis, corresponding to the first corrected curvature radius; the vertical section is divided into a first vertical section and a second vertical section that are symmetrical about the Y-axis, corresponding to the second corrected curvature radius; the two diagonal sections are divided into a first diagonal section, a second diagonal section, a third diagonal section and a fourth diagonal section that are symmetrical about the Y-axis, corresponding to the third corrected curvature radius.

[0042] Furthermore, firstly, eight cross-sections are constructed: a first horizontal cross-section, a second horizontal cross-section, a first vertical cross-section, a second vertical cross-section, a first diagonal cross-section, a second diagonal cross-section, a third diagonal cross-section, and a fourth diagonal cross-section. Secondly, using general mechanical part design software, such as three-dimensional mechanical part design software SolidWorks, Pro / Engineer, and Siemens NX (UG), the eight surfaces are mixed to form an integral optical lens, thus generating the first surface-mixed optical lens.

[0043] Furthermore, the fifth lens in the basic camera constructed in step S2 is replaced by a first curved surface hybrid optical lens to obtain a corrected optical camera.

[0044] Furthermore, in step S6, the forward-shifting and magnifying base camera includes a first lens, a fifth lens, a third lens, a fourth lens, a second lens, and a CMOS image sensor;

[0045] The generated second curved surface is mixed to form an optical lens, which replaces the fifth lens in the constructed forward-magnifying basic camera to obtain a forward-magnifying corrective optical camera.

[0046] Compared with the prior art, the advantages of the present invention are:

[0047] (1) The corrective optical camera and the forward-shifting magnification corrective optical camera constructed in this invention use two magnification methods, horizontal magnification and vertical magnification, to correct image distortion.

[0048] (2) Compared with software image correction, the present invention can save the processing delay of software image correction;

[0049] (3) Software image correction requires circuitry and hardware for software programming and program storage, resulting in high image correction costs. The corrective optical camera and forward-magnifying corrective optical camera constructed in this invention can be manufactured by mold pressing, which has the advantage of low manufacturing cost. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the upper and lower structure of the optical convex lens constructed in an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the horizontal optical convex lens constructed in an embodiment of the present invention;

[0052] Figure 3 This is a schematic diagram of the structure of the diagonal optical convex lens constructed in an embodiment of the present invention;

[0053] Figure 4 This is a schematic diagram of the structure of the basic camera constructed in an embodiment of the present invention;

[0054] Figure 5 The standard image constructed in the embodiments of the present invention;

[0055] Figure 6 This is an image of a standard image magnified by a basic camera in an embodiment of the present invention;

[0056] Figure 7 This is a composite image of a standard image and an image magnified by a base camera in an embodiment of the present invention;

[0057] Figure 8 This is a schematic diagram of the curved surface hybrid optical lens structure constructed in an embodiment of the present invention;

[0058] Figure 9 This is a schematic diagram of the combination of curved surface hybrid optical lenses in an embodiment of the present invention;

[0059] Figure 10 This is a schematic diagram of the structure of the corrective optical camera in an embodiment of the present invention;

[0060] Figure 11 This is a schematic diagram of the structure of the forward-shifting magnifying base camera constructed in an embodiment of the present invention.

[0061] Figure 12 This is a schematic diagram of the forward-shifting magnification correction optical camera in Embodiment 1 of the present invention;

[0062] Figure 13 This is a standard rectangular image composed of square units in an embodiment of the present invention;

[0063] Figure 14 This refers to a curved rectangular image formed by magnifying a standard rectangular image through a base camera or by moving the base camera forward in an embodiment of the present invention.

[0064] Figure 15a This is a schematic diagram of the forward-shifting magnification correction optical camera in Embodiment 2 of the present invention;

[0065] Figure 15b This is a schematic diagram of the forward-shifting magnification correction optical camera in Embodiment 3 of the present invention;

[0066] Figure 15c This is a schematic diagram of the forward-shifting magnification correction optical camera in Embodiment 4 of the present invention. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the present invention clearer, the specific implementation of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0068] Example 1:

[0069] The method for manufacturing an image correction optical lens for a vehicle-mounted camera includes the following steps:

[0070] S1, pre-constructed optical convex lenses with upper and lower structures, horizontal structures, and diagonal structures;

[0071] Set up a rectangular coordinate system with the origin at point O, and set the line connecting point O and point A0 as the Y-axis;

[0072] like Figure 1 As shown, points B1, C1, D1, and E1 are set, and points O, A0, B1, C1, D1, and E1 are located in the same plane. The line connecting points O and E1 is perpendicular to the Y-axis. Points O, A0, B1, C1, D1, and E1 are connected in sequence to form the first section 101. The first section 101 is rotated 360 degrees around the Y-axis in the direction of the tangent D1, which is also the direction of arrow 111. This can also be described as the first section 101 being rotated 360 degrees around the Y-axis to obtain an optical convex lens with an upper and lower structure.

[0073] like Figure 2 As shown, points B2, C2, D2, E2, and F2 are set, and points O, A0, B2, C2, D2, E2, and F2 are located in the same plane. The line connecting points O and F2 is perpendicular to the Y-axis. Points O, A0, B2, C2, D2, E2, and F2 are connected in sequence to form the second section 107. The second section 107 is rotated 360 degrees around the Y-axis, in the direction of the tangent E2, which is also the direction of arrow 110. This can also be described as the second section 107 being rotated 360 degrees around the Y-axis to obtain a horizontal optical convex lens.

[0074] like Figure 3 As shown, points B3, C3, D3, E3, and F3 are set, and points O, A0, B3, C3, D3, E3, and F3 are located in the same plane. The line connecting points O and F3 is perpendicular to the Y-axis. Points O, A0, B3, C3, D3, E3, and F3 are connected in sequence to form the third section 104. The third section 104 is rotated 360 degrees around the Y-axis, in the direction of the tangent of E3, which is also the direction of arrow 109. It can also be described as the third section 104 being rotated 360 degrees around the Y-axis to obtain a diagonal optical convex lens.

[0075] S2. Construct a basic camera and standard images, and mark the reference points and standard points in the standard images;

[0076] like Figure 4 As shown, the basic camera includes a first lens 501, a second lens 505, a third lens 503, a fourth lens 504, a fifth lens 502, and a CMOS image sensor 506 arranged sequentially from the object side to the image side.

[0077] Among them, the first lens 501 is a lens with a convex object side and a concave image side, and the radius of curvature of the convex surface of the first lens is greater than 1.2 meters; the second lens 505 is a biconvex lens, the third lens 503 is a biconvex lens, the fourth lens 504 is a biconcave lens, the third lens 503 and the fourth lens 504 form a cemented lens, and the fifth lens 502 is a concave-convex lens with a concave object side and a convex image side.

[0078] like Figure 5 As shown, the standard image is constructed as a rectangular frame, corresponding to the length × width dimensions of the CMOS image sensor 506. The reference point a is set at the center of the rectangular frame. The center line parallel to the long side of the rectangular frame is set as the horizontal symmetry line, and the center line parallel to the short side of the rectangular frame is set as the vertical symmetry line. From the center outward, points a, b, c, and d are set sequentially on the horizontal symmetry line, points a, e, and f are set sequentially on the vertical symmetry line, and points g, h, and i are set sequentially on the diagonal of the rectangle. Points b, c, d, e, f, g, h, and i are all standard points.

[0079] The distance between standard point b and reference point a is H. hor2 The distance between standard point c and reference point a is H. hor4 The distance between standard point d and reference point a is H. hor6 The distance between standard point e and reference point a is H. ver2 The distance between standard point f and reference point a is H. ver4 The distance between standard point g and reference point a is H. dia2 The distance between the standard point h and the reference point a is H. dia4 The distance between standard point i and reference point a is H. dia6 .

[0080] S3. Construct a first corrective camera based on an optical convex lens with an upper and lower structure, a second corrective camera based on an optical convex lens with a horizontal structure, and a third corrective camera based on an optical convex lens with a diagonal structure, based on the basic camera.

[0081] The fifth lens 502 in the basic camera constructed in step S2 is replaced by the top and bottom structure optical convex lens, the horizontal structure optical convex lens, and the diagonal structure optical convex lens pre-constructed in step S1, respectively, while the remaining components in the basic camera remain unchanged, thus forming a first corrective camera based on the top and bottom structure optical convex lens, a second corrective camera based on the horizontal structure optical convex lens, and a third corrective camera based on the diagonal structure optical convex lens.

[0082] S4. Adjust the parameters of the upper and lower structure optical convex lens, the horizontal structure optical convex lens, and the diagonal structure optical convex lens according to the standard image.

[0083] According to ISO 16505 Road vehicles—Ergonomics and performance aspects of camera surveillance systems—Requirements and test procedures, the magnification of the first corrected camera, based on an upper and lower optical convex lens, is set to 0.3464 when the imaging distance is 20 meters. The magnification of the upper and lower structures of the camera lens group is adjusted as follows:

[0084] like Figure 6 , Figure 7 As shown, a first corrective camera based on an optical convex lens with an upper and lower structure images a standard image to obtain a first image. Standard points e and f in the standard image are imaged by the first corrective camera based on an optical convex lens with an upper and lower structure, corresponding to moving points e' and f' in the first image. The distance between standard point e' and reference point a is H. ver1 The distance between the standard point f' and the reference point a is H. ver3 .

[0085] Adjusting the radius of curvature formed by points A0, B1, C1, and D1, i.e., increasing the magnification of the optical convex lens based on the upper and lower structure, allows point e to coincide with point e', i.e., H. ver1 =H ver2 Record the value of point B1 in the radius of curvature, which is the radius of curvature data D at point B1. B1 ;

[0086] Adjusting the radius of curvature formed by points A0, B1, C1, and D1, i.e., increasing the magnification of the optical convex lens based on the upper and lower structure, allows point f to coincide with point f', i.e., H. ver3 =H ver4 Record the value of point C1 in the radius of curvature, which is the radius of curvature data D at point C1. C1 ;

[0087] Adjust the radius of curvature formed by points A0, B1, C1, and D1, i.e., increase the magnification of the optical convex lens based on the upper and lower structure. Simultaneously, ensure that points e and e' coincide, and points f and f' coincide. Adjust the value of point D1 so that the standard image and the first imaging image coincide at the edge along the vertical line of symmetry. Record the value of point D1 in the radius of curvature; this is the radius of curvature data D1. D1 ;

[0088] Obtain the corrected data A0 and D B1 D C1 and D D1 Thus, we obtain A0 and D B1 D C1 and D D1 The first corrective radius of curvature formed;

[0089] According to ISO 16505 Road vehicles—Ergonomics and performance aspects of camera surveillance systems—Requirements and test procedures, the magnification of the second corrected camera with a horizontally structured optical convex lens is set to 0.3464 at an imaging distance of 20 meters. The magnification of the horizontal structure of the camera lens group is adjusted as follows:

[0090] like Figure 6 , Figure 7 As shown, a second corrective camera based on a horizontally structured optical convex lens images the standard image to obtain a second image. Standard points b, c, and d in the standard image are imaged by the second corrective camera based on a horizontally structured optical convex lens, corresponding to moving points b', c', and d' in the second image. The distance between standard point b' and reference point a is H. hor1 The distance between standard point c' and reference point a is H. hor3 The distance between the standard point d' and the reference point a is H. hor5 .

[0091] Adjusting the radius of curvature formed by points A0, B2, C2, D2, and E2, i.e., increasing the magnification of the horizontally structured optical convex lens, allows point b to coincide with point b', i.e., H. hor1 =H hor2 Record the value at point B2 in the radius of curvature, which is the radius of curvature data D at point B2. B2 ;

[0092] Adjusting the radius of curvature formed by points A0, B2, C2, D2, and E2, i.e., increasing the magnification of the horizontally structured optical convex lens, allows point c to coincide with point c', i.e., H. hor3 =H hor4 Record the value at point C2 in the radius of curvature, which is the radius of curvature data D at point C2. C2 ;

[0093] Adjusting the radius of curvature formed by points A0, B2, C2, D2, and E2, i.e., increasing the magnification of the horizontally structured optical convex lens, allows point d to coincide with point d', i.e., H. hor5 =H hor6 Record the value of point D2 in the radius of curvature, which is the radius of curvature data of point D2. D2 ;

[0094] Adjust the radius of curvature formed by points A0, B2, C2, D2, and E2, i.e., increase the magnification of the horizontally structured optical convex lens. Simultaneously, ensure that points b and b', c and c', and d and d' coincide. Adjust the value of point E2 so that the standard image and the second imaging image coincide at the edge along the horizontal line of symmetry. Record the value of point E2 in the radius of curvature, which is the radius of curvature data D for point E2. E2 ;

[0095] Obtain the corrected data A0 and D B2 D C2 D D2 and D E2 Thus, we obtain A0 and D B2 D C2 D D2 and D E2 The second corrected radius of curvature is formed;

[0096] According to ISO 16505 Road vehicles—Ergonomics and performance aspects of camera surveillance systems—Requirements and test procedures, the magnification of the third corrected camera with a diagonal optical convex lens is set to 0.3464 at an imaging distance of 20 meters. The magnification of the camera lens group with the diagonal structure is adjusted as follows:

[0097] like Figure 6 , Figure 7 As shown, a third corrective camera using a diagonal-structured optical convex lens images the standard image, resulting in a third image. Standard points g, h, and i in the standard image, after being imaged by the third corrective camera using the diagonal-structured optical convex lens, correspond to moving points g', h', and i' in the third image. The distance between standard point g' and reference point a is H. dia1 The distance between the standard point h' and the reference point a is H. dia3 The distance between standard point i' and reference point a is H. dia5 .

[0098] Adjusting the radius of curvature formed by points A0, B3, C3, D3, and E3, i.e., increasing the magnification of the optical convex lens based on the diagonal structure, allows point g to coincide with point g', i.e., H. dia1 =H dia2 Record the value of point B3 in the radius of curvature, which is the radius of curvature data D of point B3. B3 ;

[0099] Adjusting the radius of curvature formed by points A0, B3, C3, D3, and E3, i.e., increasing the magnification of the diagonal-structured optical convex lens, allows point h to coincide with point h', i.e., H... dia3 =H dia4 Record the value at point C3 in the radius of curvature, which is the radius of curvature data D at point C3. C3 ;

[0100] Adjusting the radius of curvature formed by points A0, B3, C3, D3, and E3, i.e., increasing the magnification of the convex lens based on the diagonal structure, allows point i to coincide with point i', i.e., H. dia5 =H dia6 Record the value of point D3 in the radius of curvature, which is the radius of curvature data of point D3.D3 ;

[0101] Adjust the radius of curvature formed by points A0, B3, C3, D3, and E3, i.e., increase the magnification of the optical convex lens based on the diagonal structure. Simultaneously, ensure that points g and g', h and h', and i and i' coincide. Adjust the value of point E3 so that the standard image and the third imaging image coincide at the edges along the diagonal direction. Record the value of point E3 in the radius of curvature, which is the radius of curvature data D for point E3. E3 ;

[0102] Obtain the corrected data A0 and D B3 D C3 and E E3 Composed of A0 and D, thus obtaining B3 D C3 and E E3 The third corrected radius of curvature is formed.

[0103] S5. Based on the parameters of the upper and lower structure optical convex lens, the horizontal structure optical convex lens and the diagonal structure optical convex lens obtained in step S4, generate the first curved surface hybrid optical lens to obtain the corrective optical camera.

[0104] like Figure 8 and Figure 9 As shown, based on the rectangular coordinate system, the center point O of the optical lens formed by the first surface is set with a horizontal section, a vertical section and two diagonal sections. The horizontal section is perpendicular to the vertical section, and the two diagonal sections are perpendicular to each other, and each of them bisects the right angle formed by the horizontal section and the vertical section.

[0105] The horizontal section is divided into a first horizontal section and a second horizontal section that are symmetrical about the Y-axis, corresponding to the first corrected curvature radius; the vertical section is divided into a first vertical section and a second vertical section that are symmetrical about the Y-axis, corresponding to the second corrected curvature radius; the two diagonal sections are divided into a first diagonal section, a second diagonal section, a third diagonal section and a fourth diagonal section that are symmetrical about the Y-axis, corresponding to the third corrected curvature radius.

[0106] First, eight cross-sections are constructed: the first horizontal cross-section, the second horizontal cross-section, the first vertical cross-section, the second vertical cross-section, the first diagonal cross-section, the second diagonal cross-section, the third diagonal cross-section, and the fourth diagonal cross-section. Then, using common mechanical part design software, such as the three-dimensional mechanical part design software SolidWorks, Pro / Engineer, and Siemens NXUG, the eight surfaces are mixed to form an integral optical lens, thus generating the first surface-mixed optical lens 507.

[0107] like Figure 10As shown, the fifth lens 502 in the basic camera constructed in step S2 is replaced by the first curved surface hybrid optical lens 507 to obtain the corrected optical camera.

[0108] S6. Construct a forward-magnifying base camera, replace the base camera with a forward-magnifying base camera, repeat steps S3 to S5, generate a second curved surface mixed optical lens, and obtain a forward-magnifying optical camera.

[0109] In this embodiment, as Figure 11 As shown, the forward-shifting magnifying basic camera includes a first lens 501, a fifth lens 502, a third lens 503, a fourth lens 504, a second lens 505, and a CMOS image sensor 506 arranged sequentially from the object side to the image side.

[0110] Among them, the first lens 501 is a lens with a convex object side and a concave image side, and the radius of curvature of the convex surface of the first lens is greater than 1.2 meters; the second lens 505 is a biconvex lens, the third lens 503 is a biconvex lens, the fourth lens 504 is a biconcave lens, the third lens 503 and the fourth lens 504 form a cemented lens, and the fifth lens 502 is a concave-convex lens with a concave object side and a convex image side.

[0111] In this embodiment, as Figure 12 As shown, the generated second curved surface is mixed to form an optical lens 508, which replaces the fifth lens 502 in the constructed forward-magnifying basic camera to obtain a forward-magnifying corrective optical camera.

[0112] exist Figure 13 , Figure 14 In the image, square units constitute a standard rectangular image 600. The upper and lower lens structures have a radius of curvature of 601, the diagonal structure has a radius of curvature of 602, the horizontal structure has a radius of curvature of 603, and square units 604, 605, 606, 607, 608, and 609. A standard rectangular image with square grids is shown below. Figure 10 As shown, the aspect ratio corresponds to the size of the CMOS image sensor, and the standard rectangular image with square grids is as follows. Figure 10 As shown, after being magnified by the basic camera, curved rectangle units 604', 605', 606', 607', 608', and 609' are generated.

[0113] The steps of this invention can realize the adjustment and design of magnification in the diagonal direction. When correcting image distortion in the diagonal direction, the stretching length is L. diaThe distance, after correcting image distortion, is approximately coincident with the standard rectangular image formed by the square unit, which means increasing the magnification in the diagonal direction of the camera's optical lens group.

[0114] The steps of this invention can realize the adjustment and design of the magnification in the diagonal direction. When correcting image distortion in the horizontal direction, the stretching length is L. hor The distance, after correcting image distortion, is approximately coincident with the standard rectangular image formed by the square unit, which means increasing the magnification in the diagonal direction of the camera's optical lens group.

[0115] The steps of this invention can realize the adjustment and design of magnification in the diagonal direction. When correcting image distortion in the vertical direction, the stretching length is L. verr The distance, after correcting image distortion, is approximately coincident with the standard rectangular image formed by the square unit, which means increasing the magnification in the diagonal direction of the camera's optical lens group.

[0116] After the above image correction, the camera magnifies the image to form a curved rectangular image, and the approximately square units constitute a standard rectangular image.

[0117] Example 2:

[0118] The difference between this embodiment and embodiment 1 is that, in step S6, the forward-shifting magnified base camera includes a first lens 501, a third lens 503, a fifth lens 502, a fourth lens 504, a second lens 505, and a CMOS image sensor 506 arranged sequentially from the object side to the image side.

[0119] Among them, the first lens 501 is a lens with a convex object side and a concave image side, and the radius of curvature of the convex surface of the first lens is greater than 1.2 meters; the second lens 505 is a biconvex lens, the third lens 503 is a biconvex lens, the fourth lens 504 is a biconcave lens, and the fifth lens 502 is a concave-convex lens with a concave object side and a convex image side.

[0120] In this embodiment, as Figure 15a As shown, the generated second curved surface is mixed to form an optical lens 508, which replaces the fifth lens 502 in the constructed forward-magnifying basic camera to obtain a forward-magnifying corrective optical camera.

[0121] Example 3:

[0122] The difference between this embodiment and embodiment 1 is that, in step S6, the forward-shifting magnified base camera includes a fifth lens 502, a first lens 501, a third lens 503, a fourth lens 504, a second lens 505, and a CMOS image sensor 506 arranged sequentially from the object side to the image side.

[0123] Among them, the first lens 501 is a lens with a convex object side and a concave image side, and the radius of curvature of the convex surface of the first lens is greater than 1.2 meters; the second lens 505 is a biconvex lens, the third lens 503 is a biconvex lens, the fourth lens 504 is a biconcave lens, the third lens 503 and the fourth lens 504 form a cemented lens, and the fifth lens 502 is a concave-convex lens with a concave object side and a convex image side.

[0124] In this embodiment, as Figure 15b As shown, the generated second curved surface is mixed to form an optical lens 508, which replaces the fifth lens 502 in the constructed forward-magnifying basic camera to obtain a forward-magnifying corrective optical camera.

[0125] Example 4:

[0126] The difference between this embodiment and embodiment 1 is that, in step S6, the forward-shifting magnified base camera includes a first lens 501, a third lens 503, a fourth lens 504, a fifth lens 502, a sixth lens 509, a second lens 505, and a CMOS image sensor 506 arranged sequentially from the object side to the image side.

[0127] Among them, the first lens 501 is a lens with a convex object side and a concave image side, and the radius of curvature of the convex surface of the first lens is greater than 1.2 meters; the second lens 505 is a biconvex lens, the third lens 503 is a biconvex lens, the fourth lens 504 is a biconcave lens, the third lens 503 and the fourth lens 504 form a cemented lens, the fifth lens 502 is a concave-convex lens with a concave object side and a convex image side; and the sixth lens 509 is a lens with a convex object side and a concave image side.

[0128] In this embodiment, as Figure 15c As shown, the generated second curved surface is mixed to form an optical lens 508, which replaces the fifth lens 502 in the constructed forward-magnifying basic camera to obtain a forward-magnifying corrective optical camera.

Claims

1. A method of manufacturing an image correction optical lens for a vehicle-mounted camera, characterized by, Includes the following steps: S1, pre-constructed optical convex lenses with upper and lower structures, horizontal structures, and diagonal structures; S2. Construct a basic camera and standard images, and mark the reference points and standard points in the standard images; S3. Construct a first corrective camera based on an optical convex lens with an upper and lower structure, a second corrective camera based on an optical convex lens with a horizontal structure, and a third corrective camera based on an optical convex lens with a diagonal structure, based on the basic camera. The fifth lens (502) in the basic camera constructed in step S2 is replaced by the top-bottom structure optical convex lens, the horizontal structure optical convex lens, and the diagonal structure optical convex lens pre-constructed in step S1, respectively. The remaining components in the basic camera remain unchanged, thus forming a first corrective camera based on the top-bottom structure optical convex lens, a second corrective camera based on the horizontal structure optical convex lens, and a third corrective camera based on the diagonal structure optical convex lens. The basic camera includes a first lens (501), a second lens (505), a third lens (503), a fourth lens (504), a fifth lens (502), and a CMOS image sensor (506) arranged sequentially from the object side to the image side. The first lens (501) is a lens with a convex object side and a concave image side, and the radius of curvature of the convex surface of the first lens is greater than 1.2 meters; the second lens (505) is a biconvex lens, the third lens (503) is a biconvex lens, the fourth lens (504) is a biconcave lens, and the fifth lens (502) is a concave-convex lens with a concave object side and a convex image side. S4. Adjust the parameters of the upper and lower structure optical convex lens, the horizontal structure optical convex lens, and the diagonal structure optical convex lens according to the standard image. S5. Based on the parameters of the upper and lower structure optical convex lens, the horizontal structure optical convex lens and the diagonal structure optical convex lens obtained in step S4, generate the first curved surface hybrid optical lens to obtain the corrective optical camera. S6. Construct a forward-shifting magnification base camera, which includes a first lens (501), a fifth lens (502), a third lens (503), a fourth lens (504), a second lens (505), and a CMOS image sensor (506) arranged sequentially from the object side to the image side. Replace the base camera with a forward-magnified base camera, repeat steps S3 to S5, generate a second curved surface hybrid optical lens, and obtain a forward-magnified corrective optical camera.

2. The method of manufacturing an image correction optical lens for a vehicle-mounted camera according to claim 1, characterized by, In step S1, a rectangular coordinate system is set with the origin at point O, and the line connecting point O and point A0 is set as the Y-axis; Points B1, C1, D1 and E1 are set, and points O, A0, B1, C1, D1 and E1 are located in the same plane. The line connecting points O and E1 is perpendicular to the Y-axis. Points O, A0, B1, C1, D1 and E1 are connected in sequence to form the first section (101). The first section (101) is rotated 360 degrees around the Y-axis to obtain an optical convex lens with an upper and lower structure. Points B2, C2, D2, E2 and F2 are set. Points O, A0, B2, C2, D2, E2 and F2 are located in the same plane, and the line connecting points O and F2 is perpendicular to the Y-axis. Points O, A0, B2, C2, D2, E2 and F2 are connected in sequence to form the second section (107). The second section (107) is rotated 360 degrees around the Y-axis to obtain a horizontal optical convex lens. Points B3, C3, D3, E3 and F3 are set. Points O, A0, B3, C3, D3, E3 and F3 are located in the same plane, and the line connecting points O and F3 is perpendicular to the Y-axis. Points O, A0, B3, C3, D3, E3 and F3 are connected in sequence to form the third section (104). The third section (104) is rotated 360 degrees around the Y-axis to obtain an optical convex lens with a diagonal structure.

3. The method of manufacturing an image correction optical lens for a vehicle-mounted camera according to claim 1, characterized by, In step S2, the third lens (503) and the fourth lens (504) form a cemented lens; The standard image is constructed as a rectangular frame, corresponding to the length × width dimensions of the CMOS image sensor (506). The reference point a is set at the center of the rectangular frame. The center line parallel to the long side of the rectangular frame is set as the horizontal symmetry line, and the center line parallel to the short side of the rectangular frame is set as the vertical symmetry line. From the center outward, points a, b, c, and d are set in sequence on the horizontal symmetry line, points a, e, and f are set in sequence on the vertical symmetry line, and points g, h, and i are set in sequence on the diagonal of the rectangle. Points b, c, d, e, f, g, h, and i are all standard points.

4. The method of manufacturing an image correction optical lens for a vehicle camera according to claim 1, wherein In step S4, according to ISO 16505 Road Vehicles—Ergonomics and performance aspects of camera monitoring systems—Requirements and test procedures, the magnification of the first corrected camera based on the upper and lower optical convex lenses is set to 0.3464 when the imaging distance is 20 meters. The magnification of the upper and lower structures of the camera lens group is adjusted as follows: A first corrective camera based on an optical convex lens with an upper and lower structure is used to image a standard image to obtain a first image. The standard points e and f in the standard image are imaged by the first corrective camera based on an optical convex lens with an upper and lower structure, and correspond to the moving points e' and f' in the first image. Adjust the curvature radius composed of points A0, B1, C1 and D1, that is, increase the magnification of the optical convex lens based on the upper and lower structures, realize the coincidence of e point and e' point, record the value of B1 point in the curvature radius, and the curvature radius data D of B1 point B1 ; Adjust the curvature radius composed of points A0, B1, C1 and D1, that is, increase the magnification of the optical convex lens based on the upper and lower structures, realize the coincidence of f point and f' point, record the numerical value of C1 point in the curvature radius, and take the curvature radius data D of C1 point C1 ; Adjust the curvature radius composed of points A0, B1, C1 and D1, that is, increase the magnification of the optical convex lens based on the upper and lower structures, ensure that the e point coincides with the e' point and the f point coincides with the f' point, and adjust the D1 point value so that the edges of the standard image and the first imaging image coincide in the vertical symmetry line direction. Record the D1 point value in the curvature radius as the D1 point curvature radius data D D1 ; Data A0, D after correction B1 , D C1 and D D1 , whereby a first corrected radius of curvature consisting of A0, D B1 , D C1 and D D1 is obtained; According to ISO 16505 Road vehicles—Ergonomics and performance aspects of camera surveillance systems—Requirements and test procedures, the magnification of the second corrected camera with a horizontally structured optical convex lens is set to 0.3464 at an imaging distance of 20 meters. The magnification of the horizontal structure of the camera lens group is adjusted as follows: A second corrective camera based on a horizontally structured optical convex lens is used to image a standard image to obtain a second image. Standard points b, c, and d in the standard image are imaged by the second corrective camera based on a horizontally structured optical convex lens, corresponding to moving points b', c', and d' in the second image. Adjust the radius of curvature consisting of points A0, B2, C2, D2 and E2, that is, increase the magnification of the optical convex lens based on the horizontal structure, realize the coincidence of b point and b' point, record the numerical value of B2 point in the radius of curvature, and take the radius of curvature data D of B2 point B2 ; Adjust the radius of curvature consisting of points A0, B2, C2, D2 and E2, that is, increase the magnification of the optical convex lens based on the horizontal structure, realize the coincidence of points c and c', record the numerical value of point C2 in the radius of curvature, and take the radius of curvature data D of point C2 C2 ; Adjust the radius of curvature composed of points A0, B2, C2, D2 and E2, that is, increase the magnification of the optical convex lens based on the horizontal structure, realize the coincidence of d point and d' point, record the numerical value of D2 point in the radius of curvature, and the curvature radius data D of D2 point D2 ; Adjust the curvature radius composed of points A0, B2, C2, D2 and E2, that is, increase the magnification of the optical convex lens based on the horizontal structure, ensure that points b and b' coincide, points c and c' coincide, and points d and d' coincide, while adjusting the value of point E2 so that the edges of the standard image and the second imaging image coincide in the horizontal symmetry line direction, and record the value of point E2 in the curvature radius as the curvature radius data D of point E2 E2 ; Data A0, D B2 , D C2 , D D2 , and D E2 , thereby obtaining a second corrected radius of curvature consisting of A0, D B2 , D C2 , D D2 , and D E2 ​ According to ISO 16505 Road vehicles—Ergonomics and performance aspects of camera surveillance systems—Requirements and test procedures, the magnification of the third corrected camera with a diagonal optical convex lens is set to 0.3464 at an imaging distance of 20 meters. The magnification of the camera lens group with the diagonal structure is adjusted as follows: A third corrective camera based on a diagonal optical convex lens is used to image the standard image to obtain a third imaging image. The standard points g, h and i in the standard image are imaged by the third corrective camera based on a diagonal optical convex lens and correspond to the moving points g', h' and i' in the third imaging image. Adjusting the radius of curvature consisting of points A0, B3, C3, D3 and E3, i.e. increasing the magnification of the optical convex lens based on the diagonal structure, to achieve the coincidence of points g and g', recording the value of point B3 in the radius of curvature as the data D of the radius of curvature of point B3 B3 ; Adjust the radius of curvature consisting of points A0, B3, C3, D3 and E3, that is, increase the magnification of the optical convex lens based on the diagonal structure, realize the coincidence of h point and h' point, record the C3 point value in the radius of curvature, and take the C3 point radius of curvature data D C3 ; Adjust the curvature radius composed of points A0, B3, C3, D3 and E3, that is, increase the magnification of the optical convex lens based on the diagonal structure, realize the coincidence of i point and i' point, record the value of D3 point in the curvature radius, and the curvature radius data D of D3 point is D3 ; Adjust the curvature radius composed of points A0, B3, C3, D3 and E3, that is, increase the magnification of the optical convex lens based on the diagonal structure, ensure that points g and g' coincide, points h and h' coincide, and points i and i' coincide, while adjusting the value of point E3 so that the standard image and the third imaging image coincide at the edge in the diagonal direction. Record the value of point E3 in the curvature radius as the curvature radius data D of point E3 E3 ; The data A0, D after correction is obtained B3 , D C3 and E E3 are composed, thereby obtaining a third correction radius of curvature composed of A0, D B3 , D C3 and E E3 .

5. The method of claim 1, wherein the method further comprises: In step S5, based on the rectangular coordinate system, a horizontal section, a vertical section, and two diagonal sections are set at the center point O of the optical lens formed by the first surface mixing. The horizontal section is perpendicular to the vertical section, and the two diagonal sections are perpendicular to each other, and each of them bisects the right angle formed by the horizontal section and the vertical section. The horizontal section is divided into a first horizontal section and a second horizontal section that are symmetrical about the Y-axis, corresponding to the first corrected curvature radius; the vertical section is divided into a first vertical section and a second vertical section that are symmetrical about the Y-axis, corresponding to the second corrected curvature radius; the two diagonal sections are divided into a first diagonal section, a second diagonal section, a third diagonal section and a fourth diagonal section that are symmetrical about the Y-axis, corresponding to the third corrected curvature radius.

6. The method of manufacturing an image correction optical lens for a vehicle camera according to claim 5, wherein First, eight cross-sections are constructed: the first horizontal cross-section, the second horizontal cross-section, the first vertical cross-section, the second vertical cross-section, the first diagonal cross-section, the second diagonal cross-section, the third diagonal cross-section, and the fourth diagonal cross-section. Then, using general mechanical part design software, the eight curved surfaces are combined to form an integral optical lens, which generates the first curved surface combined optical lens (507).

7. The method of manufacturing an image correction optical lens for a vehicle-mounted camera according to claim 5, characterized by, The fifth lens (502) in the basic camera constructed in step S2 is replaced by the first curved surface hybrid optical lens (507) to obtain the corrected optical camera.

8. The method for manufacturing an image correction optical lens for a vehicle-mounted camera according to claim 1, characterized in that, In step S6, the generated second curved surface is mixed to form an optical lens, which replaces the fifth lens (502) in the constructed forward-magnifying basic camera to obtain a forward-magnifying corrective optical camera.

Images