A method for improving the consistency of optical axis of high zoom ratio continuous zoom camera

Abstract

The present invention discloses a method for improving the consistency of the optical axis of a high zoom ratio continuous zoom camera, which belongs to the technical field of optoelectronic equipment. It uses a light source, a cross target, a collimator, and a four-dimensional adjustment bracket to form an optical platform system, and sets the product to be tested on the four-dimensional adjustment bracket accordingly. Then, through the generation of a virtual electric cross, the alignment of the electric cross and the cross target, the measurement of the deviation between the electric cross and the cross target during the zoom process of the tested product, the determination and calibration of the consistency of the optical axis, the determination and calibration of the consistency of the optical axis of the tested product can be realized, and the image shift compensation output when the optical axis is inconsistent can be realized. The method in the present invention is simple to operate, has a small human factor, can improve the accuracy and reliability of the use of a high zoom ratio continuous zoom camera, is suitable for the mass production process of the product, reduces the production and application costs of the high zoom ratio continuous zoom camera, and has good practical value and application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of optoelectronic equipment, and in particular relates to a method for improving the consistency of the optical axis of a high-zoom ratio continuous zoom camera. Background Art

[0002] The camera system is widely used in airborne or vehicle-mounted search, aiming and indication systems due to its long effective range, high zoom ratio and wide spectrum. It is used to perform visible light and near-infrared imaging of targets under typical meteorological conditions, allowing operators to observe and search for targets during the day.

[0003] In the actual use of the camera system, it is often necessary to switch between a small field of view and a large field of view and change the focal length to adapt to the focused imaging of different target objects. During the field of view conversion process, in order to prevent the observed target from disappearing, high requirements are placed on the consistency of the optical axis of the lens.

[0004] At present, in actual production and assembly, in order to ensure the consistency of the optical axis of high zoom ratio continuous zoom cameras, high requirements are placed on the processing of the zoom mechanism, compensation mechanism and lens tube, and also on the assembly ability and level of workers. In the process of mass production and short time production, it is difficult for traditional methods to effectively meet the requirements of optical axis consistency of high zoom ratio continuous zoom cameras. Summary of the invention

[0005] In response to one or more of the above defects or improvement needs in the prior art, the present invention provides a method for improving the consistency of the optical axis of a high-zoom ratio continuous zoom camera, which can quickly detect the change of the optical axis during the zooming process of the high-zoom ratio continuous zoom camera, and on this basis, realize output image compensation for cameras with unqualified optical axis consistency, thereby ensuring the consistency of the optical axis of the high-zoom ratio continuous zoom camera during zoom output, and ensuring the reliability and accuracy of the use of the high-zoom ratio continuous zoom camera.

[0006] To achieve the above object, the present invention provides a method for improving the consistency of the optical axis of a high zoom ratio continuous zoom camera, which comprises the following steps:

[0007] S1. Setting up an optical platform system; the optical platform system includes a coaxially arranged light source, a cross target and a collimator, and a four-dimensional adjustment bracket is arranged at one end of the collimator away from the cross target; accordingly, the product to be tested is connected to a power supply and a control mechanism and then placed on the four-dimensional adjustment bracket;

[0008] S2, control the product under test to work, and generate an electric cross mark at the center of the output field of view;

[0009] S3, adjusting the four-dimensional adjustment bracket so that the electric cross mark coincides with the cross target in the field of view;

[0010] S4, issuing a zoom command through a control mechanism to control the product under test to switch between a large field of view and a small field of view;

[0011] S5. Obtain the difference between the electric cross and the cross target during the zooming process of the tested product to determine whether it meets the optical axis consistency requirements;

[0012] S6, recording the jitter position point and position jitter value of the product under test during the field of view switching process, and storing the position jitter value as a position compensation value corresponding to the image output under the strain ratio;

[0013] S7. When the product under test is zoomed to the jumping position point of the optical axis consistency, the position compensation value corresponding to the jumping position point is called, and the field of view image is compensated by image shift compensation and then output.

[0014] As a further improvement of the present invention, in step S5, the standard for the optical axis consistency of the tested product is:

[0015] When switching from a large field of view to a small field of view, the deviation between the electric cross and the cross target does not exceed 4 pixels; when switching from a small field of view to a large field of view, the deviation between the electric cross and the cross target does not exceed 5 pixels; and during the continuous magnification process of the tested product, the instantaneous deviation is no more than 2 pixels.

[0016] As a further improvement of the present invention, in step S6, the position compensation value includes a jitter position point, a jitter value and a jitter direction.

[0017] As a further improvement of the present invention, the product under test includes an electronic component and a CMOS imaging component; the electronic component includes a control board with a microprocessor, a variable magnification potentiometer and an analog-to-digital conversion chip;

[0018] Accordingly, the process of obtaining the jumping position point is as follows:

[0019] The control board samples the current voltage value of the variable magnification potentiometer according to the analog-to-digital conversion sampling chip, and after the analog-to-digital conversion sampling chip converts the analog voltage value into a 12-bit digital signal, the microprocessor of the control board reads the 12-bit digital signal converted by the analog-to-digital conversion sampling chip, records it as the current position value and stores it.

[0020] As a further improvement of the present invention, in step S7, the chip pixel format of the CMOS imaging component is RAW data in Bayer format, and before the overall movement of the video image, the image in Bayer format is first restored to RGB format.

[0021] As a further improvement of the present invention, the effective resolution of the image output by the CMOS imaging component is 1920*1080, and the effective resolution output by the CMOS photosensitive chip of the CMOS imaging component is 1936*1096, that is, 8 lines of data are reserved on the top and bottom and left and right of the output image respectively.

[0022] As a further improvement of the present invention, an image translation function module is provided in the CMOS imaging component, which is used to move the entire image according to the translation direction and the number of translation pixels sent by an external instruction, and the timing of the entire image movement is the frame blanking period.

[0023] As a further improvement of the present invention, the imaging compensation process of the CMOS imaging component is as follows:

[0024] Taking the center of the 1936×1096 screen as the reference point, the coordinates of the first pixel are calculated according to the directions ±X, ±Y and offsets offsetX, offsetY sent by the electronic component as the movement amounts, and an output image with an effective resolution of 1920×1080 is cropped from the 1936×1096 screen.

[0025] As a further improvement of the present invention, the light source is an integrating sphere; and / or,

[0026] The collimator is a large-caliber off-axis reflective collimator.

[0027] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0028] In general, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

[0029] (1) The method of improving the optical axis consistency of a high zoom ratio continuous zoom camera of the present invention utilizes the corresponding arrangement of a light source, a cross target, a collimator, and a four-dimensional adjustment bracket to form an optical platform system. By arranging the optical platform system corresponding to the product to be tested on the four-dimensional adjustment bracket, and then by generating a virtual electric cross, aligning the electric cross with the cross target, measuring the deviation between the electric cross and the cross target during the zoom process of the product to be tested, and determining and calibrating the optical axis consistency, the product to be tested can ensure the optical axis consistency of the output image in different zoom situations by image shift compensation, thereby achieving reliable and stable output of the product to be tested, improving the accuracy of the use of the high zoom ratio continuous zoom camera, and reducing the preparation cost and application cost of the product.

[0030] (2) The method of the present invention for improving the consistency of the optical axis of a high-zoom ratio continuous zoom camera can avoid the influence of manual operation factors during product processing and assembly, reduce the processing difficulty and labor cost of the product, and effectively meet the calibration requirements at different stages during the use of the product, thereby ensuring the functional reliability of the product throughout its entire use cycle. The entire method is highly efficient and practical.

[0031] (3) The method of improving the optical axis consistency of a high-zoom continuous zoom camera of the present invention and the setting of the optical platform system thereof can be used not only for optical axis consistency detection of newly manufactured products, but also for calibration of new products whose optical axis consistency is unqualified and old products whose optical axis consistency has changed, thereby reducing the failure rate of new products, extending the service life of products, and reducing the application cost of products.

[0032] (4) The method of improving the consistency of the optical axis of a high-zoom ratio continuous zoom camera of the present invention is simple to operate, with little human factors, and can accurately complete the compensation for the change of the optical axis during the zooming process of the high-zoom ratio continuous zoom camera, thereby ensuring the consistency of the optical axis of the zoom output of the product after continuous zooming, improving the accuracy and reliability of product use, and is suitable for mass production of high-zoom ratio continuous zoom cameras, thereby reducing the production and application costs of high-zoom ratio continuous zoom cameras, and has good practical value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a schematic diagram of the system composition of an optical platform for implementing the method in an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the test light path configuration in an embodiment of the present invention;

[0036] Figure 3 to Figure 7 is a schematic structural diagram of a high zoom ratio continuous zoom camera in an embodiment of the present invention;

[0037] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0038] 1. Light source; 2. Cross target; 3. Collimator; 4. Four-dimensional adjustment bracket; 5. Tested product; 6. Power supply; 7. Cable; 8. Control mechanism;

[0039] 501, focusing mechanism; 502, zoom mechanism; 503, compensation mechanism; 504, rear fixing mechanism; 505, lens tube; 506, zoom lens tube; 507, locking ring; 508, camera connection ring; 509, CMOS imaging component; 510, electronic component;

[0040] 5021, the second cemented lens; 5022, the third cemented lens; 5023, the zoom inner lens frame; 5024, the zoom spacer; 5025, the zoom pressure ring; 5026, the zoom frame; 5031, the ninth lens; 5032, the fourth cemented lens; 5033, the compensation spacer; 5034, the compensation inner lens frame; 5035, the compensation pressure ring; 5036, the compensation frame. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] Example:

[0047] In the present invention, the method for improving the optical axis consistency of a high zoom ratio continuous zoom camera is preferably performed by Figure 1 This is achieved using the optical bench system shown in .

[0048] The optical platform system includes a light source 1, a cross target 2, and a collimator 3 which are sequentially arranged along the optical axis. The three are coaxially arranged to form a Figure 2 At the same time, a four-dimensional adjustment bracket 4 is provided at the end of the collimator 3 away from the cross target 2, so that the product 5 to be tested (i.e., a high-magnification continuous zoom camera) can be placed on the four-dimensional adjustment bracket 4 accordingly, thereby completing the alignment setting of the product 5 to be tested and the collimator 3.

[0049] Correspondingly, the optical platform system also includes a power supply 6 and a control mechanism 8 arranged corresponding to the product under test 5, both of which are electrically connected to the product under test 5 through a cable 7, for supplying power to the product under test 5 and controlling its corresponding operation.

[0050] Specifically, the tested product 5 in the preferred embodiment is as follows Figure 3 to Figure 7 As shown in , it preferably includes a focusing mechanism 501, a magnification mechanism 502, a compensation mechanism 503, a rear fixing mechanism 504, a lens tube 505, a magnification lens tube 506, a locking ring 507, a camera connecting ring 508, a CMOS imaging component 509 and an electronic component 510.

[0051] For the product under test 5, the zoom process refers to the zoom mechanism 502 and the compensation mechanism 503 moving smoothly in the lens tube 505 to achieve continuous change of the field of view. The process of changing from a "large field of view" to a "small field of view" is the process of the zoom mechanism 502 and the compensation mechanism 503 approaching each other; conversely, the process of changing from a "small field of view" to a "large field of view" is the process of the zoom mechanism 502 and the compensation mechanism 503 moving away from each other.

[0052] It should be noted that due to the differences in the molding and assembly precision of each component, the optical axis of the product 5 under test may change during the above process, that is, the optical axis before and after the continuous change of the field of view is inconsistent. During the zoom process, the main components that affect the consistency of the optical axis are the zoom mechanism 502, the compensation mechanism 503 and the mirror tube 505.

[0053] like Figure 6 As shown in the figure, the zoom mechanism 502 in the preferred embodiment includes a second cemented lens 5021, a third cemented lens 5022, a zoom inner lens frame 5023, a zoom spacer ring 5024, a zoom pressure ring 5025 and a zoom lens frame 5026.

[0054] like Figure 7 As shown, the compensation mechanism 503 in the preferred embodiment includes a ninth lens 5031 , a fourth cemented lens 5032 , a compensation spacer 5033 , a compensation inner lens frame 5034 , a compensation pressure ring 5035 and a compensation lens frame 5036 .

[0055] In more detail, the circumference of the zoom lens frame 5026 of the zoom mechanism 502 and the compensation lens frame 5036 of the compensation mechanism 503 in the preferred embodiment is 0.004mm and the size is Φ45mm. The lens frame 5026 and the compensation lens frame 5036 of the compensation mechanism 503 are matched according to the measurement size in the lens tube 505, and the lens tube 505 is required to slide smoothly, and the matching clearance is controlled to be 0.003mm to 0.006mm. After the parts are matched and processed, the parts are numbered and circulated as a set. In order for the zoom lens frame 5026, the compensating lens frame 5036, and the mirror tube 505 to meet actual application indicators, the following processes need to be carried out in sequence during the actual processing: rough processing, aging treatment, semi-finishing, high temperature cycle treatment, fine processing, and then grinding to meet the 0.004mm requirement; at the same time, after the zoom lens frame 5026, the compensating lens frame 5036, and the mirror tube 505 are processed, workers are also required to grind the zoom lens frame 5026, the compensating lens frame 5036, and the mirror tube 505 during the product assembly process to ensure that the zoom lens frame 5026 and the compensating lens frame 5036 can move smoothly in the mirror tube 505.

[0056] Normally, in the grinding process of the above-mentioned parts, the assembly experience of the workers is mainly relied on. The different operating techniques and experiences of each person will lead to the fact that the product accuracy of the corresponding parts cannot be fully guaranteed. In addition, the components of the zoom mechanism 502 and the compensation mechanism 503 are more, and the assembly accuracy of each component will also affect the consistency of the optical axis of the assembled product. This is also the fundamental reason for the inconsistency of the optical axis of the measured product 5 after assembly and setting in the preferred embodiment. During the assembly and production of the measured product 5, improving the accuracy of processing and assembly is an effective way to improve the consistency of the optical axis of the measured product 5. However, due to the complex structure of the measured product 5, there are many links that need to be controlled in the processing and assembly process. The method of simply improving the processing and assembly accuracy of the product cannot fully meet the needs of practical applications. Moreover, during the use of the product, due to the influence of factors such as product bumps and deformation, the optical axis inconsistency will also occur, thereby affecting the normal use of the product.

[0057] Therefore, in order to improve the consistency of the optical axis when using a high zoom ratio continuous zoom camera, in a preferred embodiment, an optical platform system is set up, and on this basis, an image motion compensation method for improving the consistency of the optical axis of a high zoom ratio continuous zoom camera is designed. The method preferably includes the following steps:

[0058] S1. Build an optical platform system including a light source 1, a cross target 2, a parallel light tube 3, and a four-dimensional adjustment bracket 4, and assemble the product under test 5 on the four-dimensional adjustment bracket 4; accordingly, set a power supply 6 and a control mechanism 8 corresponding to the product under test 5, so that the product under test 5 is electrically connected to the power supply 6 and the control mechanism 8 through a cable 7, the power supply 6 supplies power to the product under test 5, and the control mechanism 8 controls the operation of the product under test 5 and displays the shooting field of view of the product under test 5.

[0059] In actual setting, the light source 1 is preferably an integrating sphere, which is preferably electrically connected to the power source 6 by a cable 7; the cross target 2 is preferably a cross target with a scale, and the collimator 3 is preferably a large-diameter off-axis reflective collimator. The combination of the three can form Figure 2 Meanwhile, the control mechanism 8 in the preferred embodiment is preferably a computer, which has a built-in control program for the tested product 5, and can display the field of view of the tested product 5 in real time and control the tested product 5 to complete the continuous zoom process.

[0060] S2, control the light source 1 and the product under test 5 to work, so that the product under test 5 is in a small field of view shooting state or a large field of view shooting state, and send an electric cross command to the product under test 5, and generate a virtual "cross" mark in the center of the field of view picture displayed by the control mechanism 8;

[0061] S3: Adjust the four-dimensional adjustment bracket 4 so that the electric cross at the center of the field of view of the product 5 under test coincides with the photographed cross target 2;

[0062] It should be noted that the central cross of the cross target 2 is a real object, which can actually exist in the field of view image of the product 5 under test. At the same time, the four-dimensional adjustment bracket 4 in the preferred embodiment can be adjusted in the X-axis direction, the Y-axis direction, the Z-axis direction, and the θ (angle) direction, so it is a four-dimensional adjustment bracket 4. However, the cross target 2 and the four-dimensional adjustment bracket 4 are both relatively mature products in the prior art, so they will not be described here.

[0063] S4, the control mechanism 8 issues a zoom command to control the product under test 5 to switch the zoom of the field of view, continuously changing from a "small field of view" to a "large field of view"; or, continuously changing from a "large field of view" to a "small field of view";

[0064] S5, obtaining the difference between the electric cross and the cross target during the zoom process according to the field of view of the product under test 5, and determining whether the difference meets the requirement of optical axis consistency;

[0065] In actual judgment, the optical axis consistency of the product under test 5 preferably meets the following standards: when switching from a large field of view to a small field of view, the deviation between the electric cross and the cross target 2 does not exceed 4 pixels; when switching from a small field of view to a large field of view, the deviation between the electric cross and the cross target 2 does not exceed 5 pixels; at the same time, during the continuous magnification process of the product under test 5, the instantaneous deviation should not be greater than 2 pixels.

[0066] In addition, regarding the sending of corresponding control instructions of the control mechanism 8, the CAN communication protocol is adopted in the preferred embodiment, which is not the focus of the present invention and will not be elaborated here.

[0067] S6. When the optical axis consistency of the product 5 under test does not meet the requirements, the position jump value of the electric cross relative to the cross target 2 at different zoom ratios during the field of view switching process is recorded, and this is used as the reference for optical axis consistency calibration. In a preferred embodiment, the position jump value corresponds to the jump position point of the optical axis consistency of the product 5 under test, and preferably includes the jump value and the jump direction.

[0068] Specifically, when performing S6, it is further preferred to include the following process:

[0069] S61: The control mechanism 8 sends a "field of view +" or "field of view -" command to the product under test 5 to control the field of view of the product under test 5 to increase or decrease;

[0070] S62: During the continuous zooming process, the electronic component 510 of the product under test 5 collects and stores the position compensation value (including the jump position point, jump value and jump direction, etc.) at any zooming moment;

[0071] In a preferred embodiment, the electronic component 510 of the product under test 5 includes a control board with a microprocessor, a variable magnification potentiometer, and an analog-to-digital conversion sampling chip (preferably an analog-to-digital conversion sampling HWD7888 chip). The control board is used to receive instructions from the control mechanism 8 and control the product under test 5 to complete the field of view switching process; during the field of view switching process, the control board samples the current voltage value of the variable magnification potentiometer according to the analog-to-digital conversion sampling chip, and after the analog-to-digital conversion sampling chip converts the analog voltage value into a 12-bit digital signal, the microprocessor of the control board reads the 12-bit digital signal converted by the analog-to-digital conversion sampling chip, and stores it after recording it as the current position value.

[0072] S7. When the product 5 under test is zoomed to the jumping position point of the optical axis consistency, the CMOS imaging component 509 of the product 5 under test calls the position compensation value stored in the electronic component 510, and outputs the field of view image after compensating it in the form of image motion compensation;

[0073] During actual control, the position compensation value is preferably transmitted between the CMOS imaging component 509 and the electronic component 510 via the RS422 serial port.

[0074] In more detail, in actual operation, the image motion compensation method is used inside the CMOS imaging component 509 to achieve the overall movement of the output video image. Further, the effective resolution of the image output by the CMOS imaging component 509 is preferably 1920*1080, and the effective resolution of the CMOS photosensitive chip is much larger than 1920*1080. For example, in a preferred embodiment, the effective resolution of the CMOS photosensitive chip output is 1936*1096. At this time, 8 lines of data are reserved in the upper and lower parts and the left and right parts of the output image, respectively, to provide conditions for image motion compensation.

[0075] More specifically, the chip pixel format of the CMOS imaging component 509 is preferably RAW data in Bayer format. Before the overall movement of the video image, it is preferred to restore the Bayer format image to RGB format. Since each pixel senses a spectrum, and adjacent pixels have photosensitivity response values ​​of different spectra, if the Bayer format image is not restored to RGB format, the adjacent pixels cannot be replaced with each other due to different spectral responses, and the image translation accuracy is 2 pixels. This accuracy obviously cannot meet the requirements of refined movement. After the Bayer format data is restored to RGB format, each pixel has three RGB color components, and adjacent pixels can be replaced and moved, thereby achieving overall image translation with 1 pixel accuracy.

[0076] In actual settings, it is preferred to provide an image translation function module in the CMOS imaging component 509, which can move the entire image according to the translation direction and the number of translation pixels sent by external instructions. At the same time, in order to ensure the continuous stability of the image output, the time when this function takes effect is preferably the frame blanking period, that is, the window period between two adjacent images.

[0077] During specific imaging compensation, it is preferred to use the center of the 1936×1096 image as the reference point, calculate the coordinates of the first pixel based on the directions ±X, ±Y and offsets offsetX, offsetY sent by the electronic component 510 as the movement amounts, and crop an image with an effective resolution of 1920×1080 output by the tested product 5 from the 1936×1096 screen.

[0078] S8. After the image motion compensation output in S7 is completed, S5 is used to detect whether the optical axis consistency of the output image meets the standard of actual application, so as to verify the result of the image motion compensation.

[0079] The method for improving the consistency of the optical axis of a high-zoom ratio continuous zoom camera in the present invention is simple to operate, has little human factor, can accurately complete the compensation for the change of the optical axis during the zooming process of the high-zoom ratio continuous zoom camera, ensures the consistency of the optical axis of the zoom output after the product is continuously zoomed, improves the accuracy and reliability of product use, is suitable for mass production of high-zoom ratio continuous zoom cameras, reduces the production and application costs of high-zoom ratio continuous zoom cameras, and has good practical value and application prospects.

[0080] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for improving the consistency of the optical axis of a high zoom ratio continuous zoom camera, characterized in that: The steps include: S1. Setting up an optical platform system; the optical platform system includes a coaxially arranged light source, a cross target and a collimator, and a four-dimensional adjustment bracket is arranged at one end of the collimator away from the cross target; accordingly, the product to be tested is connected to a power supply and a control mechanism and then placed on the four-dimensional adjustment bracket; S2, control the product under test to work, and generate an electric cross mark at the center of the output field of view; S3, adjusting the four-dimensional adjustment bracket so that the electric cross mark coincides with the cross target in the field of view; S4, issuing a zoom command through a control mechanism to control the product under test to switch between a large field of view and a small field of view; S5. Obtain the difference between the electric cross and the cross target during the zooming process of the tested product to determine whether it meets the optical axis consistency requirement; the standard for the tested product to meet the optical axis consistency requirement is: When switching from a large field of view to a small field of view, the deviation between the electric cross and the cross target does not exceed 4 pixels; when switching from a small field of view to a large field of view, the deviation between the electric cross and the cross target does not exceed 5 pixels; and during the continuous zooming process of the product under test, the instantaneous deviation is no more than 2 pixels; S6, recording the jitter position point and position jitter value of the product under test during the field of view switching process, and storing the position jitter value as a position compensation value corresponding to the image output under the strain ratio; S7. When the product under test is zoomed to the jumping position point of the optical axis consistency, the position compensation value corresponding to the jumping position point is called, and the field of view image is compensated by image motion compensation and then output; The product under test includes an electronic component and a CMOS imaging component; the electronic component includes a control board with a microprocessor, a variable magnification potentiometer and an analog-to-digital conversion chip; accordingly, the process of obtaining the beating position point is as follows: The control board samples the current voltage value of the variable magnification potentiometer according to the analog-to-digital conversion sampling chip, and after the analog-to-digital conversion sampling chip converts the analog voltage value into a 12-bit digital signal, the microprocessor of the control board reads the 12-bit digital signal converted by the analog-to-digital conversion sampling chip, and records it as the current position value and then stores it; and The chip pixel format of the CMOS imaging component is RAW data in Bayer format. Before the overall movement of the video image, the Bayer format image is first restored to RGB format; the effective resolution of the image output by the CMOS imaging component is 1920*1080, and the effective resolution output by the CMOS photosensitive chip of the CMOS imaging component is 1936*1096, that is, 8 lines of data are reserved in the upper and lower parts and the left and right parts of the output image respectively; an image translation function module is provided in the CMOS imaging component, which is used to move the overall image according to the translation direction and the number of translation pixels sent by the external instruction, and the timing of the overall image movement is the frame blanking period; The imaging compensation process of the CMOS imaging component is as follows: Taking the center of the 1936×1096 screen as the reference point, the coordinates of the first pixel are calculated according to the directions ±X, ±Y and offsets offsetX, offsetY sent by the electronic component as the movement amounts, and an output image with an effective resolution of 1920×1080 is cropped from the 1936×1096 screen.

2. The method for improving the optical axis consistency of a high zoom ratio continuous zoom camera according to claim 1, characterized in that: In step S6, the position compensation value includes a jitter position point, a jitter value and a jitter direction.

3. The method for improving the optical axis consistency of a high zoom ratio continuous zoom camera according to claim 1 or 2, characterized in that: The light source is an integrating sphere; and / or the collimator is a large-aperture off-axis reflective collimator.

Images