CN112630924A - Zoom curve correction method, device, storage medium and system - Google Patents
Zoom curve correction method, device, storage medium and system Download PDFInfo
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- CN112630924A CN112630924A CN202011384938.XA CN202011384938A CN112630924A CN 112630924 A CN112630924 A CN 112630924A CN 202011384938 A CN202011384938 A CN 202011384938A CN 112630924 A CN112630924 A CN 112630924A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
Abstract
The invention discloses a zoom curve correction method, which is characterized in that a correction value corresponding to a zoom lens group to be corrected at a focal length adjusting position is obtained, and the correction value is axially superposed on a zoom position corresponding to any focal length on a theoretical zoom curve of the zoom lens group to be corrected, so that a corrected zoom curve is obtained. When the zoom lens group moves according to the corrected zoom curve and the compensation lens group moves according to the theoretical focusing curve, the zoom lens can obtain clear imaging on an image plane. The zoom curve correction method can correct the focal length of the zoom lens more accurately, and has the advantages of few operation steps and simple operation.
Description
Technical Field
The present invention relates to the field of zoom lens technology, and in particular, to a method, an apparatus, a storage medium, and a system for correcting a focus curve.
Background
The zoom lens is an optical system in which the focal length is continuously changed within a certain range while the image plane is kept stationary. The method can obtain images with different proportions under the condition that the shooting point is not changed, so that the method has an extremely important position in the fields of news interview, film shooting, television rebroadcasting, security monitoring and the like. The zoom lens includes a variable power lens group providing magnification and a compensation lens group compensating an image plane. From the wide-angle end to the telephoto end of the lens, the focal length corresponding to the position of the variable power lens group and the position thereof constitutes a zoom curve, and the position of the compensation lens group and the focal length thereof constitute a focus curve. When the zoom lens group and the compensation lens group move according to a zoom curve and a focus curve, respectively, theoretically, the zoom lens can obtain clear images at each focal length. However, in the actual processing and assembling process of the lens, there are various processing and assembling errors, positioning errors of PI (Photo-Interrupt), and the like, so that the zoom lens cannot obtain clear images on the image plane when the zoom lens group and the compensation lens group move according to the zoom curve and the focus curve, respectively.
Disclosure of Invention
The invention mainly aims to provide a zoom curve correction method, aiming at solving the problem that a zoom lens cannot obtain clear imaging on an image plane when a zoom lens group and a compensation lens group respectively move according to a zoom curve and a focusing curve due to various errors in the actual processing and assembling processes of the zoom lens.
In order to achieve the above object, the present invention provides a method for correcting a zoom curve, comprising the following steps:
acquiring a theoretical zoom curve of a zoom lens group to be corrected of the zoom lens;
acquiring a correction value corresponding to the zoom lens group to be corrected at the position of adjusting the focal length; the focal length adjustment is to calculate the back focal length of the zoom lens corresponding to each focal length according to a test zoom curve, and the focal length corresponding to the maximum absolute difference value of the corresponding back focal length and the theoretical back focal length; the correction value is the corresponding axial displacement of the zoom lens group to be corrected when the imaging is clear in the process of adjusting the zoom lens group to be corrected to move in the axial direction at the focal length adjusting position;
and superposing the correction value on the zoom position corresponding to any focal length on the theoretical zoom curve of the zoom lens group to be corrected along the axial direction so as to obtain a corrected zoom curve.
Optionally, after the step of axially superimposing the correction value on the zoom position corresponding to any focal length on the theoretical zoom curve of the zoom lens group to be corrected to obtain a corrected zoom curve, the method further includes:
and storing the zoom curve after the zoom lens group to be corrected is corrected.
Optionally, the step of acquiring a corresponding correction value of the variable magnification lens group to be corrected at the adjusted focal length includes:
acquiring an adjusting focal length of a zoom lens group to be corrected;
acquiring a theoretical focusing curve of the compensation lens group;
controlling an electric driving device to drive the compensation lens group to move to a theoretical focusing position corresponding to the adjusted focal length, and driving the zoom lens group to be corrected to move near the theoretical focusing position corresponding to the adjusted focal length and receive an imaging image collected by an image collector, wherein the electric driving device is respectively in driving connection with the zoom lens group and the compensation lens group, and the image collector is located on an image plane of the zoom lens;
and when the imaging image is clear, acquiring the displacement of the actual focusing position of the zoom lens group to be corrected relative to the theoretical zooming position as a corrected value.
Optionally, the step of obtaining the adjusted focal length of the variable power lens group to be corrected includes:
superposing the zoom positions corresponding to any focal length on the theoretical zoom curve by the pre-judging displacement amount along the axial direction to obtain a test zoom curve;
calculating the back focal length of the zoom lens corresponding to each focal length according to the test zoom curve and the theoretical focusing curve;
and selecting the focal length corresponding to the maximum absolute difference value of the back focal length and the theoretical back focal length as an adjustment focal length.
Optionally, the zoom lens comprises at least two variable power lens groups, and the at least two variable power lens groups comprise a variable power lens group to be corrected and other variable power lens groups;
the step of calculating the back focal length of the zoom lens corresponding to each focal length according to the test zoom curve and the theoretical focusing curve comprises the following steps:
and calculating the back focal length corresponding to each focal length according to the test zoom curve of the variable power lens group to be corrected, the theoretical zoom curves of other variable power lens groups and the theoretical focusing curve.
Optionally, the other variable power lens groups are all uncorrected variable power lens groups;
the step of controlling the electric driving device to drive the compensation lens group to move to the theoretical focusing position corresponding to the adjusted focal length, and to drive the zoom lens group to be corrected to move near the theoretical zooming position corresponding to the adjusted focal length, and to receive the imaging image collected by the image collector includes:
and controlling an electric drive device to drive the uncorrected zoom lens group and the compensation lens group to respectively move to a theoretical zoom position and a theoretical focusing position corresponding to the adjusted focal length, and drive the zoom lens group to be corrected to move near the theoretical zoom position corresponding to the adjusted focal length and receive the imaging image collected by the image collector.
Optionally, the other variable power lens group comprises an uncorrected variable power lens group and a corrected variable power lens group;
the step of controlling the electric driving device to drive the compensation lens group to move to the theoretical focusing position corresponding to the adjusted focal length, and to drive the zoom lens group to be corrected to move near the theoretical zooming position corresponding to the adjusted focal length, and to receive the imaging image collected by the image collector includes:
acquiring a corrected zoom curve of the corrected zoom lens group;
and controlling the electric drive device to drive the uncorrected lens group and the compensation lens group to respectively move to a theoretical zooming position and a theoretical focusing position corresponding to the adjusted focal length, the corrected zoom lens group to move to a corrected zooming position corresponding to the adjusted focal length, and controlling the zoom lens group to be corrected to move near the theoretical zooming position corresponding to the adjusted focal length and receive the imaging image collected by the image collector.
The invention also provides a zoom curve correction device, which comprises a memory, a processor and a zoom curve correction program stored on the memory and capable of running on the processor, wherein the zoom curve correction program is configured to realize the steps of the zoom curve correction method.
The present invention further provides a storage medium, wherein the storage medium stores the zoom curve correction program, and the zoom curve correction program implements the steps of the zoom curve correction method when executed by a processor.
The invention also provides a zoom curve correction system, comprising:
the zoom lens comprises a zoom lens group and a compensation lens group which are coaxially arranged, and both the zoom lens group and the compensation lens group can move along the axial direction of the zoom lens;
the test light source is used for emitting parallel light beams to the shooting end of the zoom lens;
the image collector is positioned on an image plane of the zoom lens and used for collecting an imaging image of the zoom lens;
the electric driving device is in driving connection with the zoom lens group and the compensation lens group and is used for driving the plurality of zoom lens groups and the plurality of compensation lens groups to move;
the controller is electrically connected with the image collector and the electric drive device, and the controller comprises the zoom curve correction device.
The technical scheme of the invention provides a zoom curve correction method, when a zoom lens group moves according to a corrected zoom curve and a compensation lens group moves according to a theoretical focusing curve, the zoom lens can obtain clear imaging on an image plane. Various errors exist in the actual processing and assembling process of the zoom lens, so that the focal length of each lens group and the interval between adjacent lens groups are inconsistent with theory, and further, when each lens group is arranged at a certain focal length according to the theoretical position, the focal length of the zoom lens is inconsistent with the theoretical value, so that the image is not clear on the theoretical image plane.
Optical analysis shows that the influence of errors existing in the back focal length of each lens group and the interval between adjacent lens groups on the focal length of the zoom lens can be compensated by changing the positions of the lens groups; and the influence of the change in the position of each lens group on the focal length of the zoom lens is different. Through theoretical analysis and experimental verification, when the zoom lens group moves according to a theoretical zoom curve, in order to make the zoom lens image from the wide-angle end to the telephoto end clear, the correction value difference of the focusing position of the compensation lens group at each focal length is large, so that more points need to be measured from the wide-angle end to the telephoto end to provide a more accurate focusing position. However, when the compensation lens group moves according to the theoretical focusing curve, in order to make the zoom lens image from the wide-angle end to the telephoto end clear, the difference of the corrected values of the zoom positions of the zoom lens groups at each focal length is small, so that the zoom curve can be corrected more conveniently to correct the focal length of the zoom lens, and the correction effect is better. In view of the above theoretical analysis and experimental verification, the method for correcting the zoom curve of the present invention obtains the correction value corresponding to the zoom lens group to be corrected at the position of adjusting the focal length, and superimposes the correction value on the zoom position corresponding to any focal length on the theoretical zoom curve of the zoom lens group to be corrected along the axial direction, so as to obtain the corrected zoom curve. The zoom curve correction method can correct the focal length of the zoom lens more accurately, and has the advantages of few operation steps and simple operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a zoom curve correction system according to the present invention;
fig. 2 is a flowchart of an embodiment of a zoom curve correction method according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
3 | |
| 2 | |
4 | Controller |
The implementation, functional features and advantages of the objects of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three scenarios in parallel, exemplified by "A and/or B" including either the A scenario, or the B scenario, or both A and B scenarios. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Various errors exist in the actual processing and assembling process of the zoom lens, so that the focal length of each lens group and the interval between adjacent lens groups are inconsistent with the theory, and further, when each lens group is arranged at a certain focal length according to the theoretical position, the back focal length of the zoom lens is inconsistent with the theoretical value, so that the image is not clear on the theoretical image plane. In view of the above, the present invention provides a method, an apparatus and a system for correcting a zoom curve, which aims to enable a zoom lens to obtain a clear image on an image plane when a zoom lens group moves according to the corrected zoom curve and a compensation lens group moves according to a theoretical focusing curve by correcting the zoom curve.
Fig. 1 is a schematic structural diagram of an embodiment of a zoom curve correction system of the present invention, and referring to fig. 1, the zoom curve correction system includes a zoom lens, a test light source 1, an image collector 2, an electric driving device 3, and a controller 4. The zoom lens comprises a zoom lens group and a compensation lens group which are coaxially arranged, and the zoom lens group and the compensation lens group can move along the axial direction of the zoom lens group and the compensation lens group; the test light source 1 is used for emitting parallel light beams to the shooting end of the zoom lens; the image collector 2 is positioned on the image plane of the zoom lens and is used for collecting the imaging image of the zoom lens; the electric driving device 3 is in driving connection with the zoom lens group and the compensation lens group and is used for driving the zoom lens group and the compensation lens group to move; the controller 4 is electrically connected with the image collector 2 and the electric driving device 3, and the controller 4 comprises a zoom curve correction device. The electric driving device 3 includes a plurality of driving motors, and each of the zoom lens set and the compensation lens set is in driving connection with one of the driving motors.
The zoom curve correction device comprises a memory, a processor and a zoom curve correction program stored on the memory and capable of running on the processor, wherein the zoom curve correction program is configured to realize the zoom curve correction method.
The present invention also provides a storage medium having a zoom curve correction program stored thereon, the steps of the zoom curve correction method of the present invention being implemented when the zoom curve correction program is executed by a processor.
Optical analysis shows that the influence of errors existing in the focal length of each lens group and the interval between adjacent lens groups on the back focal length of the zoom lens can be compensated by changing the positions of the lens groups; and the influence of the change in the position of each lens group on the back focal length of the zoom lens is different. Through theoretical analysis and experimental verification, when the zoom lens group moves according to a theoretical zoom curve, in order to make the zoom lens image from the wide-angle end to the telephoto end clear, the correction value difference of the focusing position of the compensation lens group at each focal length is large, so that more points need to be measured from the wide-angle end to the telephoto end to provide a more accurate focusing position. However, when the compensation lens group moves according to the theoretical focusing curve, in order to make the zoom lens image from the wide-angle end to the telephoto end clear, the difference of the corrected values of the zoom positions of the zoom lens groups at each focal length is small, so that the back focal length of the zoom lens can be corrected more conveniently by correcting the zoom curve, and the correction effect is better. In view of the above theoretical analysis and experimental verification, the present invention provides a method for correcting a zoom curve, comprising the following steps:
s10, acquiring a theoretical zoom curve of the zoom lens group to be corrected of the zoom lens;
s20, acquiring a correction value corresponding to the zoom lens group to be corrected at the position of adjusting the focal length; the focal length adjustment is to calculate the back focal length of the zoom lens corresponding to each focal length according to a test zoom curve, and the focal length corresponding to the maximum absolute difference value of the corresponding back focal length and the theoretical back focal length; the correction value is the corresponding axial displacement of the zoom lens group to be corrected when the imaging is clear in the process of adjusting the zoom lens group to be corrected to move in the axial direction at the focal length adjusting position;
and S30, superposing the corrected values on the zoom positions corresponding to any focal length on the theoretical zoom curve of the zoom lens group to be corrected along the axial direction to obtain a corrected zoom curve.
Wherein, the back focal length is the distance from the top point of the last optical surface in the optical system comprising a plurality of lenses to the back focal point. The zoom curve correction method of the invention obtains the correction value corresponding to the zoom lens group to be corrected at the position of adjusting the focal length, and the correction value is axially superposed on the zoom position corresponding to any focal length on the theoretical zoom curve of the zoom lens group to be corrected, thus obtaining the corrected zoom curve. The zoom curve correction method can be used for correcting the focal length of the zoom lens more accurately, and is less in operation steps and simple in operation.
Further, the step S30 is followed by:
and S40, storing the corrected zoom curve of the zoom lens group to be corrected. Conveniently extract the corrected zooming curve
Further, S20, the step of obtaining the corresponding correction value of the variable power lens group to be corrected at the adjusted focal length includes:
s201, acquiring an adjusting focal length of a zoom lens group to be corrected;
s202, acquiring a theoretical focusing curve of the compensation lens group;
s203, controlling an electric drive device to drive the compensation lens group to move to a theoretical focusing position corresponding to the adjusted focal length, and driving the zoom lens group to be corrected to move near the theoretical focusing position corresponding to the adjusted focal length and receive an imaging image collected by an image collector, wherein the electric drive device is respectively in driving connection with the zoom lens group and the compensation lens group, and the image collector is located on an image plane of the zoom lens;
s204, when the imaging image is clear, acquiring the displacement of the actual focusing position of the zoom lens group to be corrected relative to the theoretical zooming position as a corrected value.
The step of obtaining the adjusted focal length of the zoom lens group to be corrected comprises the following steps:
s2011, superposing the zoom positions corresponding to any focal length on the theoretical zoom curve along the axial direction to pre-judge displacement so as to obtain a test zoom curve;
s2012, calculating the back focal length of the zoom lens corresponding to each focal length according to the test zoom curve and the theoretical focusing curve;
s2013, selecting the focal length corresponding to the maximum absolute difference value of the back focal length and the theoretical back focal length as the adjusted focal length.
Theoretical analysis and experimental verification show that the influence of changing the position of the zoom lens group on the back focal length of the zoom lens at each focal length is different, namely the sensitivity of the back focal length corresponding to each focal length to the position change of the zoom lens group is different, and the focal length which is most sensitive to the position of the zoom lens group is selected to correct, so that the best correction effect can be obtained.
In view of this, in the zoom curve correction method of the present invention, first, the pre-determined displacement is axially superimposed at the zoom position corresponding to any focal length on the theoretical zoom curve of the zoom lens group to be corrected, so as to obtain the test zoom curve, and the test zoom curve can amplify the influence of the change of the position of the zoom lens group on the back focal length of the zoom lens, so as to better determine the position of the adjusted focal length. And secondly, selecting the focal length corresponding to the maximum absolute difference value between the back focal length and the theoretical back focal length as an adjusted focal length, wherein the influence of the position change of the zoom lens group on the back focal length is the maximum at the adjusted focal length.
The method for calculating the back focal length of the zoom lens corresponding to each focal length according to the test zoom curve of the zoom lens group to be corrected and the theoretical diagonal curve of the compensation lens group is a conventional method in the field, and details are not repeated in this application.
Generally, when a zoom lens includes a variable power lens group and a compensation lens group, a deviation of a zoom curve caused by errors due to processing and assembly is gradually increased from a wide-angle end to a telephoto end, and therefore, the telephoto end having the largest focal length is generally selected to take a correction value.
When the zoom lens includes a plurality of variable power lens groups, the influence of a slight change in the positions of the different variable power lens groups on the back focal length is different from the wide angle end to the telephoto end. Theoretical analysis and experimental verification show that the influence conditions of the small changes of the positions of different zoom lens groups on the back focal length are different at different focal lengths. For example, a zoom lens has three variable power lens groups and a compensation lens group, and from the wide angle end to the telephoto end, the same displacement is changed for the first variable power lens group on the basis of the theoretical zoom position, the variation of the back focal length is largest at the telephoto end, the same displacement is changed for the second variable power lens group on the basis of the theoretical zoom position, the variation of the back focal length is largest at the medium power end, the same displacement is changed for the third variable power lens group on the basis of the theoretical zoom position, and the variation of the back focal length is largest at the wide angle end. Accordingly, for a plurality of zoom lens groups, the focal length needs to be adjusted. Therefore, the step of calculating the back focal length of the zoom lens corresponding to each focal length according to the test zoom curve and the theoretical focus curve includes:
s2012', calculating the back focal length corresponding to each focal length according to the test zoom curve of the zoom lens group to be corrected, the theoretical zoom curves of other zoom lens groups and the theoretical focusing curve.
It should be noted that, when all of the other variable power lens groups are the uncorrected variable power lens groups, the theoretical zoom curve of each of the uncorrected variable power lens groups is used for calculation. When the other zoom lens groups comprise the uncorrected zoom lens group and the corrected zoom lens group, the corrected zoom lens group can participate in calculation by using a theoretical zoom curve and can also participate in calculation by using a corrected zoom curve.
For a zoom lens including a plurality of variable power lens groups, the first correction, or in the middle correction, or the last correction, the acquired correction value is slightly different, specifically as follows,
when other zoom lens groups are all uncorrected zoom lens groups, controlling an electric drive device to drive the uncorrected lens groups and the compensation lens groups to respectively move to a theoretical zooming position and a theoretical focusing position corresponding to the adjusted focal length, and driving the zoom lens groups to be corrected to move near the theoretical zooming position corresponding to the adjusted focal length and receive imaging images collected by an image collector; and when the imaging image is clear, acquiring the displacement of the zoom lens group to be corrected relative to the theoretical zoom position as a correction value.
When the other zoom lens groups comprise the uncorrected zoom lens group and the corrected zoom lens group; firstly, acquiring a corrected zoom curve of a corrected zoom lens group; secondly, controlling an electric drive device to drive the uncorrected lens group and the compensation lens group to respectively move to a theoretical zooming position and a theoretical focusing position corresponding to the adjusted focal length, and the corrected zoom lens group moves to a corrected zooming position corresponding to the adjusted focal length, and drives the zoom lens group to be corrected to move near the theoretical focusing position corresponding to the adjusted focal length and receive the imaging image collected by the image collector; and when an imaging image is clear, acquiring the displacement of the zoom lens group to be corrected relative to the theoretical zoom position as a corrected value.
When all the other zoom lens groups are corrected zoom lens groups, firstly, acquiring a corrected zoom curve of the corrected zoom lens groups; secondly, controlling an electric drive device to drive a compensation lens group to move to a theoretical focusing position corresponding to the adjusted focal length, move a corrected zoom lens group to a corrected zooming position corresponding to the adjusted focal length, drive a zoom lens group to be corrected to move near the theoretical focusing position corresponding to the adjusted focal length, and receive an imaging image collected by an image collector; and when the imaging image is clear, acquiring the displacement of the zoom lens group to be corrected relative to the theoretical zoom position as a correction value.
Specifically, take a zoom lens comprising 3 variable power lens groups as an example, wherein the adjusted focal length of the first variable power lens group is calculated as a first adjusted focal length, the adjusted focal length of the second variable power lens group is calculated as a second adjusted focal length, and the adjusted focal length of the third variable power lens group is calculated as a third adjusted focal length. Specifically, the steps of obtaining the first correction value, the second correction value and the third correction value are as follows:
the first step is as follows: controlling the second zoom lens group, the third zoom lens group and the compensation lens group to respectively move to a theoretical zoom position and a theoretical focusing position corresponding to the first adjusting focal length, adjusting the first zoom lens group to move along the axis of the first zoom lens group near the theoretical zoom position corresponding to the first adjusting focal length, acquiring the adjustment amount as a first correction value when an imaging image acquired by an image acquisition device is clear, and axially superposing the first correction value on the zoom position corresponding to any focal length on the theoretical zoom curve of the first zoom lens group to acquire and store a corrected zoom curve of the first zoom lens group;
the second step is that: controlling the third zoom lens group and the compensation lens group to respectively move to a theoretical zoom position and a theoretical focusing position corresponding to a second adjusting focal length, moving the first zoom lens group to a corrected zoom position corresponding to the second adjusting focal length, adjusting the second zoom lens group to move along the axis of the second zoom lens group near the theoretical zoom position corresponding to the second adjusting focal length, when an image acquired by the image acquisition device is clear, acquiring the adjustment amount as a second correction value, and axially superposing the second correction value on any zoom position corresponding to any focal length on the theoretical zoom curve of the first zoom lens group to acquire and store a corrected zoom curve of the second zoom lens group;
the third step: and controlling the first zoom lens group and the second zoom lens group to move to corrected zooming positions corresponding to a third adjusting focal length, moving the compensation lens group to a theoretical focusing position corresponding to the third adjusting focal length, adjusting the third zoom lens group to move along the axis of the third zoom lens group near the theoretical zooming position corresponding to the third adjusting focal length, acquiring the adjustment quantity as a third correction value when an imaging image acquired by the image acquisition device is clear, and axially superposing the third correction value on any zooming position corresponding to any focal length on the theoretical zooming curve of the third zoom lens group to acquire and store the corrected zooming curve of the third zoom lens group.
Through the steps, the zoom curve of each zoom lens group after being corrected is obtained, when the zoom lens drives the zoom lens groups according to the corrected zoom curve and drives the compensation lens group according to the theoretical focusing curve, clear imaging can be obtained at any focal length.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for correcting a zoom curve, comprising the steps of:
acquiring a theoretical zoom curve of a zoom lens group to be corrected of the zoom lens;
acquiring a correction value corresponding to the zoom lens group to be corrected at the position of adjusting the focal length; the focal length adjustment is to calculate the back focal length of the zoom lens corresponding to each focal length according to a test zoom curve, and the focal length corresponding to the maximum absolute difference value of the corresponding back focal length and the theoretical back focal length; the correction value is the corresponding axial displacement of the zoom lens group to be corrected when the imaging is clear in the process of adjusting the zoom lens group to be corrected to move in the axial direction at the focal length adjusting position;
and superposing the correction value on the zoom position corresponding to any focal length on the theoretical zoom curve of the zoom lens group to be corrected along the axial direction so as to obtain a corrected zoom curve.
2. The method for correcting the zoom curve according to claim 1, wherein the step of axially superimposing the correction value on the zoom position corresponding to any focal length on the theoretical zoom curve of the zoom lens group to be corrected to obtain the corrected zoom curve further comprises:
and storing the zoom curve after the zoom lens group to be corrected is corrected.
3. The zoom curve correction method according to claim 1, wherein the step of acquiring the correction value corresponding to the zoom lens group to be corrected at the adjusted focal length comprises:
acquiring an adjusting focal length of a zoom lens group to be corrected;
acquiring a theoretical focusing curve of the compensation lens group;
controlling an electric drive device to drive the compensation lens group to move to a theoretical focusing position corresponding to the adjusted focal length, and driving the zoom lens group to be corrected to move near the theoretical zooming position corresponding to the adjusted focal length and receive an imaging image collected by an image collector; the electric drive device is respectively in drive connection with the zoom lens group and the compensation lens group, and the image collector is positioned on an image plane of the zoom lens;
and when the imaging image is clear, acquiring the displacement of the actual zooming position of the zoom lens group to be corrected relative to the theoretical zooming position as a corrected value.
4. The zoom curve correction method according to claim 3, wherein the step of obtaining the adjusted focal length of the variable power lens group to be corrected includes:
superposing the zoom positions corresponding to any focal length on the theoretical zoom curve along the axial direction to pre-judge displacement so as to obtain a test zoom curve;
calculating the back focal length of the zoom lens corresponding to each focal length according to the test zoom curve and the theoretical focusing curve;
and selecting the focal length corresponding to the maximum absolute difference value of the back focal length and the theoretical back focal length as an adjusting focal length.
5. The zoom curve correcting method according to claim 4, wherein the zoom lens includes at least two variable power lens groups including a variable power lens group to be corrected and other variable power lens groups;
the step of calculating the back focal length of the zoom lens corresponding to each focal length according to the test zoom curve and the theoretical focusing curve comprises the following steps:
and calculating the back focal length of the zoom lens corresponding to each focal length according to the test zoom curve of the zoom lens group to be corrected, the theoretical zoom curves of other zoom lens groups and the theoretical focusing curve.
6. The zoom curve correcting method according to claim 5, wherein the other variable power lens groups are all uncorrected variable power lens groups;
the step of controlling the electric driving device to drive the compensation lens group to move to the theoretical focusing position corresponding to the adjusted focal length, and to drive the zoom lens group to be corrected to move near the theoretical zooming position corresponding to the adjusted focal length, and to receive the imaging image collected by the image collector includes:
and controlling an electric drive device to drive the uncorrected zoom lens group and the compensation lens group to respectively move to a theoretical zoom position and a theoretical focusing position corresponding to the adjusted focal length, and drive the variable-magnification lens group to be corrected to move near the theoretical zoom position corresponding to the adjusted focal length and receive the imaging image collected by the image collector.
7. The zoom curve correcting method according to claim 5, wherein the other variable power lens groups include an uncorrected variable power lens group and a corrected variable power lens group;
the step of controlling the electric driving device to drive the compensation lens group to move to the theoretical focusing position corresponding to the adjusted focal length, and to drive the zoom lens group to be corrected to move near the theoretical zooming position corresponding to the adjusted focal length, and to receive the imaging image collected by the image collector includes:
acquiring a corrected zoom curve of the corrected zoom lens group;
and controlling the electric drive device to drive the uncorrected lens group and the compensation lens group to respectively move to a theoretical zooming position and a theoretical focusing position corresponding to the adjusted focal length, move the corrected zoom lens group to a corrected zooming position corresponding to the adjusted focal length, and control the zoom lens group to be corrected to move near the theoretical zooming position corresponding to the adjusted focal length and receive the imaging image collected by the image collector.
8. A zoom curve correction device comprising a memory, a processor, and a zoom curve correction program stored on the memory and executable on the processor, the zoom curve correction program being configured to implement the steps of the zoom curve correction method according to any one of claims 1 to 7.
9. A storage medium having stored thereon the zoom curve correction program, which when executed by a processor, implements the steps of the zoom curve correction method according to any one of claims 1 to 7.
10. A zoom curve correction system, comprising:
the zoom lens comprises a zoom lens group and a compensation lens group which are coaxially arranged, and both the zoom lens group and the compensation lens group can move along the axial direction of the zoom lens;
the test light source is used for emitting parallel light beams to the shooting end of the zoom lens;
the image collector is positioned on an image plane of the zoom lens and used for collecting an imaging image of the zoom lens;
the electric driving device is in driving connection with the zoom lens group and the compensation lens group and is used for driving the plurality of zoom lens groups and the plurality of compensation lens groups to move;
a controller electrically connected to the image collector and the electric drive device, the controller comprising the zoom curve correction device of claim 8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305350A (en) * | 2021-12-16 | 2022-04-12 | 上海掌门科技有限公司 | Pulse feeling equipment and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5028773A (en) * | 1988-08-23 | 1991-07-02 | Ricoh Company, Ltd. | Lens controller includes a zooming optical system and a zooming speed control device |
| CN104301611A (en) * | 2014-10-14 | 2015-01-21 | 浙江宇视科技有限公司 | Method and device for correcting zoom tracking curve |
| CN106303190A (en) * | 2015-05-25 | 2017-01-04 | 深圳市福斯康姆智能科技有限公司 | Zoom tracking curve antidote and device |
| CN106657787A (en) * | 2016-12-28 | 2017-05-10 | 天津天地伟业生产力促进有限公司 | Fast correction method for zoom tracking curve |
| WO2018179318A1 (en) * | 2017-03-31 | 2018-10-04 | Cbc株式会社 | Program and lens control device |
| CN110045562A (en) * | 2019-04-18 | 2019-07-23 | 重庆紫光华山智安科技有限公司 | Synchronous focusing method, device, storage medium and electric terminal in zooming procedure |
-
2020
- 2020-11-30 CN CN202011384938.XA patent/CN112630924B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5028773A (en) * | 1988-08-23 | 1991-07-02 | Ricoh Company, Ltd. | Lens controller includes a zooming optical system and a zooming speed control device |
| CN104301611A (en) * | 2014-10-14 | 2015-01-21 | 浙江宇视科技有限公司 | Method and device for correcting zoom tracking curve |
| CN106303190A (en) * | 2015-05-25 | 2017-01-04 | 深圳市福斯康姆智能科技有限公司 | Zoom tracking curve antidote and device |
| CN106657787A (en) * | 2016-12-28 | 2017-05-10 | 天津天地伟业生产力促进有限公司 | Fast correction method for zoom tracking curve |
| WO2018179318A1 (en) * | 2017-03-31 | 2018-10-04 | Cbc株式会社 | Program and lens control device |
| CN110045562A (en) * | 2019-04-18 | 2019-07-23 | 重庆紫光华山智安科技有限公司 | Synchronous focusing method, device, storage medium and electric terminal in zooming procedure |
Non-Patent Citations (1)
| Title |
|---|
| 林忠等: "应用于大变倍监控摄像机的电动变焦跟踪", 《应用光学》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305350A (en) * | 2021-12-16 | 2022-04-12 | 上海掌门科技有限公司 | Pulse feeling equipment and method |
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