A method for correcting parallelism between the optical axis of a laser range finder and a zoom system

Abstract

The present application belongs to the field of weapon fire control system, and particularly relates to a method for correcting parallelism of optical axes of a laser range finder and a zoom system. The method changes the position of a sighting crosshair scale, and the optical axes of the zoom system are consistent at different focal lengths. The corresponding relationship between the scale position and the focal length is stored in a control board. The control board is part of the zoom system, and can realize the functions of superimposing a crosshair scale on a video and zoom control. During ranging, the sighting scale changes position with the focal length. The method eliminates the sighting error caused by inconsistency of the optical axes of the zoom system. Compared with the prior art, the scheme realizes ranging during the whole zooming process, and reduces the difficulty of debugging.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of weapon fire control system, and particularly relates to a method for correcting parallelism of an optical axis of a laser range finder and a zoom system. BACKGROUND

[0002] At present, the method for correcting parallelism of the optical axis of the laser range finder and the optical axis of the continuous zoom system has the following shortcomings:

[0003] (1) The optical axis of the zoom system will change in the continuous zoom process, and the optical axis can only be corrected at a certain fixed focal length, and the focal length of the zoom system must be adjusted to the correction focal length position when the ranging sight is adjusted.

[0004] (2) The requirement of consistency of the optical axis of the zoom system increases the difficulty of assembling and adjusting the zoom system, and a method is needed to reduce the difficulty of assembling and adjusting. SUMMARY

[0005] (I) Technical problem to be solved

[0006] The technical problem to be solved by the present application is how to provide an adjustment method which can realize parallelism of the optical axis of the continuous zoom optical system at any zoom position and the optical axis of the laser range finder.

[0007] (II) Technical scheme

[0008] In order to solve the above technical problem, the present application provides a method for correcting parallelism of the optical axis of a laser range finder and a zoom system, which comprises the following steps:

[0009] Step S1: placing the laser range finder and the zoom system in front of a collimator; placing a cross division at the focal point of the collimator, the cross division being imaged on the focal plane of the zoom system, and adjusting the focus to make the cross division clear;

[0010] Step S2: adjusting the image of the collimator division plate, i.e. the image division coincides with the cross division;

[0011] Step S3: fixing the bearing module of the zoom system, and adjusting the laser range finder so that the optical axis thereof is parallel to the optical axis of the zoom system;

[0012] Step S4: starting from the longest focal length of the zoom system, controlling the zoom of the zoom system at a certain distance as a step, and accurately adjusting the focus after each zoom to make the image division clear;

[0013] Step S5: moving the cross division to coincide with the image division; calculating the pixel position corresponding to the center of gravity of the cross division, and saving the pixel position and the data information of the corresponding focal length;

[0014] Step S6: repeating steps S4-S5 until the focal length reaches the shortest position;

[0015] Step S7: all the saved data are stored in an interpolation mode, so that any focal length corresponds to the position of the crosshair, and an interpolation storage database is obtained;

[0016] Step S8: when the laser range finder measures the distance, the crosshair is superimposed on the display video, and the target is aimed by using the crosshair; since the position of the crosshair corresponds to the focal length, according to the calibrated corresponding relationship, the crosshair position corresponding to any focal length can be obtained by using linear interpolation.

[0017] The zoom system is a zoom system of a continuous zoom optical camera.

[0018] In step S4, the certain distance is 5 mm, and 5 mm is taken as the zoom step.

[0019] In step S5, the crosshair pixel position corresponding to any focal length f is calculated according to the following formula:

[0020]

[0021]

[0022] X and Y are pixel coordinates of the crosshair;

[0023] (X2, Y2) and (X1, Y1) are pixel coordinates of adjacent crosshairs;

[0024] f1 and f2 are adjacent focal lengths of f.

[0025] The continuous zoom optical camera has the functions of superimposing the crosshair and storing the crosshair position.

[0026] (Three) beneficial effects

[0027] Compared with the prior art, in the technical scheme of the present application, the corresponding relationship between the electronic crosshair and the focal length is calibrated first, and according to the calibrated corresponding relationship, the crosshair position corresponding to any focal length can be obtained by using linear interpolation. Compared with the prior art, the scheme realizes distance measurement in the whole zoom process, and reduces the debugging difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic view of the image crosshair and the electronic crosshair in the technical scheme of the present application. DETAILED DESCRIPTION

[0029] In order to make the purpose, content and advantages of the present application more clear, the specific embodiments of the present application are further described in detail below in combination with the drawings and examples.

[0030] To solve the above technical problems, the application provides a laser range finder and zoom system optical axis parallelism correction method, which comprises the following steps:

[0031] Step S1: place the laser range finder and zoom system in front of a collimator; place a crosshair at the focal point of the collimator, and image the crosshair on the focal plane of the zoom system, and focus to make the crosshair clear;

[0032] Step S2: adjust the image of the collimator scale plate, i.e. make the image scale coincide with the crosshair;

[0033] Step S3: fix the bearing module of the zoom system, and adjust the laser range finder so that its optical axis is parallel to the optical axis of the zoom system;

[0034] Step S4: start from the longest focal length of the zoom system, control the zooming of the zoom system at a certain distance as a step, and accurately focus after each zooming to make the image scale clear;

[0035] Step S5: move the crosshair to coincide with the image scale; calculate the pixel position corresponding to the center of gravity of the crosshair, and save the pixel position and corresponding focal length data information;

[0036] Step S6: repeat steps S4-S5 until the focal length reaches the shortest position;

[0037] Step S7: store all the saved data in an interpolation manner so that any focal length corresponds to the position of the crosshair one by one, and obtain an interpolation storage database;

[0038] Step S8: when the laser range finder measures the distance, superimpose the crosshair on the display video, and use the crosshair to aim at the target. Since the position of the crosshair corresponds to the focal length, according to the corresponding relationship of the calibration, the linear interpolation can be used to obtain the crosshair position corresponding to any focal length.

[0039] The zoom system is a zoom system of a continuous zoom optical camera.

[0040] In step S4, the certain distance is 5mm, and 5mm is taken as the zooming step.

[0041] In step S5, the pixel position of the crosshair corresponding to any focal length f is calculated according to the following formula:

[0042]

[0043]

[0044] X and Y are pixel coordinates of the crosshair.

[0045] (X2, Y2), (X1, Y1) are pixel coordinates of adjacent crosshairs;

[0046] f1, f2 are adjacent focal lengths of f.

[0047] The continuous zoom optical camera has the functions of superimposing crosshairs and storing crosshair positions.

[0048] Embodiment 1

[0049] The embodiment provides a laser range finder and zoom system optical axis parallelism electronic correction method, and the method comprises the following steps:

[0050] Step S1: place the laser range finder and the camera zoom system in front of a collimator. A crosshair is placed at the focal point of the collimator, the crosshair is imaged on the camera focal plane, and the crosshair is focused to be clear. Adjust the module to make the laser light spot coincide with the crosshair.

[0051] Step S2: fix the module and the laser range finder, start from the longest focal length, control the zoom system to zoom at a step of 5mm, and accurately focus the crosshair image to be clear after each zoom. Calculate the pixel position corresponding to the center of gravity of the crosshair, and save the pixel position and the corresponding focal length.

[0052] Step S3: repeat step S2 until the focal length reaches the shortest position.

[0053] Step S4: all data is stored in an interpolation manner, so that any focal length corresponds to a crosshair position.

[0054] Step S4: when ranging, superimpose an electronic crosshair on the video, and use the electronic crosshair to aim at the target. The position of the electronic crosshair corresponds to the focal length.

[0055] Embodiment 2

[0056] To solve the above technical problems, the embodiment provides a method for adjusting the optical axis parallelism of a continuous zoom optical camera and a laser range finder. The method comprises the following steps:

[0057] Step S1: place the laser range finder and the continuous zoom optical camera module in front of a collimator. The module control board superimposes a crosshair (hereinafter referred to as an electronic crosshair) in the center of the video.

[0058] Step S2: adjust the module position so that the image (hereinafter referred to as the image crosshair) of the collimator crosshair plate coincides with the electronic crosshair.

[0059] Step S3: fix the camera module, and adjust the laser range finder so that the optical axis is parallel to the optical axis of the camera.

[0060] Step S4: control the zoom of the camera, take 5mm zoom step. After each zoom, refocus to make the image scale clear.

[0061] Step S5: move the electronic scale to coincide with the image scale. Store the position of the electronic scale and the corresponding focal length.

[0062] Step S6: repeat steps S4 and S5 until the shortest focal length position of the system is reached.

[0063] Step S7: when ranging, aim the electronic scale at the target, and the position of the electronic scale corresponds to the focal length.

[0064] Example 3

[0065] To solve the problems of the prior art, the embodiment provides a laser range finder and a continuous zoom camera optical axis electronic calibration method. The camera used in the embodiment should have the functions of superimposing an electronic scale and storing the scale position.

[0066] The method comprises the following steps:

[0067] Step S1: place the zoom camera and the laser range finder in front of a collimator.

[0068] Step S2: adjust the focal length of the camera to the longest, and adjust the optical support to make the electronic scale of the camera coincide with the image scale of the collimator.

[0069] Step S3: adjust the laser range finder to make the optical axis of the laser range finder parallel to the optical axis of the camera at the longest focal length. Fix the camera and the range finder together.

[0070] Step S4: gradually shorten the focal length, with a step of 5mm; after each zoom, move the electronic scale to coincide with the image scale, and save the current focal length and the position of the electronic scale. Repeat the operation until the shortest focal length.

[0071] Step S5: the scale position corresponding to an arbitrary focal length f is calculated according to the following formula:

[0072]

[0073]

[0074] X, Y are the pixel coordinates of the electronic scale, (x2, y2), (x1, y1) are the pixel coordinates of the adjacent electronic scale,

[0075] f2, f1 are the adjacent focal lengths of f

[0076] In summary, the present application belongs to the field of weapon fire control system, and particularly relates to a method for correcting parallelism of optical axes of a laser range finder and a zoom system. The method changes the position of a sighting crosshair division, and the optical axes are consistent at different focal lengths of the zoom system. The corresponding relationship between the division position and the focal length is stored in a control board. The control board is part of the zoom system, and functions of superimposing a crosshair on a video and zoom control are realized. During ranging, the sighting crosshair changes position with the focal length. The method eliminates the sighting error caused by inconsistency of the optical axes of the zoom system. Compared with the prior art, the scheme realizes ranging during the whole zooming process, and reduces the difficulty of debugging.

[0077] The above description is only preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, some improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A method for correcting the parallelism of the optical axis of a laser rangefinder and a zoom system, characterized in that, The method includes the following steps: Step S1: Place the laser rangefinder and zoom system in front of the collimator; place the crosshair at the focal point of the collimator, and the crosshair will be imaged on the focal plane of the zoom system. Adjust the focus to make the crosshair clear. Step S2: Adjust the image of the collimator reticle so that the image reticle coincides with the crosshair reticle; Step S3: Fix the carrier module of the zoom system and adjust the laser rangefinder to make its optical axis parallel to the optical axis of the zoom system; Step S4: Starting from the longest focal length of the zoom system, control the zoom system to zoom in steps of a certain distance, and precisely adjust the focus after each zoom to make the image reticle clear. Step S5: Move the crosshair to coincide with the image reticle; calculate the pixel position corresponding to the centroid of the crosshair, and save the pixel position and corresponding focal length data; Step S6: Repeat steps S4-S5 until the focal length reaches its shortest position. Step S7: All the saved data is stored using interpolation, so that any focal length corresponds one-to-one with the position of the crosshair, thus obtaining an interpolated storage database; Step S8: When measuring distance with a laser rangefinder, a crosshair is superimposed on the displayed video. The target is aimed using the crosshair. Since the position of the crosshair corresponds to the focal length, the position of the crosshair corresponding to any focal length can be obtained by linear interpolation based on the calibrated correspondence. The zoom system is a zoom system of a continuous zoom optical camera; In step S4, the certain distance is 5 mm, and 5 mm is used as the zoom step size; In step S5, the position of the crosshair pixel corresponding to any focal length f is calculated using the following formula: Where X and Y are the pixel coordinates of the cross-shaped split; Where (X2, Y2) and (X1, Y1) are the pixel coordinates of the adjacent cross divisions; Where f1 and f2 are the nearest focal lengths of f; The continuous zoom optical camera has the functions of superimposing crosshairs and storing reticle positions; The method first calibrates the correspondence between the electronic reticle and the focal length. Based on the calibrated correspondence, the position of the cross reticle corresponding to any focal length can be obtained by linear interpolation. This method involves changing the position of the aiming reticle to align with the optical axis of the zoom system at different focal lengths, and storing the correspondence between the reticle position and focal length in the control board. The control board is part of the zoom system and enables the overlay of the reticle and zoom control functions onto the video. During distance measurement, the aiming reticle changes position as the focal length changes. This method eliminates aiming errors caused by the inconsistency of the optical axis of the zoom system. The method achieves distance measurement throughout the entire zoom process and reduces the difficulty of debugging.

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