CN114415329A - Method for improving focus clear point position offset of telephoto lens - Google Patents
Method for improving focus clear point position offset of telephoto lens Download PDFInfo
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Abstract
The invention discloses a method for improving the offset of the position of a clear point of a telephoto lens, which comprises the steps of collecting focusing feedback value data at different temperatures returned by an imaging system under the conditions of opening a box door and closing the box door in the temperature rising and falling process within the temperature range of-20-60 ℃, analyzing through the recorded data and fitting a returned value curve of the position of the focusing clear point at different temperatures; and then writing return value curves of the focusing clear point positions at different temperatures into a main control board of the imaging system, sending a focusing instruction by the imaging system every 30 minutes according to the current return temperature value of the temperature sensor, and calculating the focusing value by adopting an averaging method according to the return value curve relationship of the focusing clear point positions at different temperatures. The method can obviously improve the focus clear point position deviation of the telephoto lens caused by the change of the environmental temperature. In addition, the method has the advantages of simple process, convenient operation and obvious effect.
Description
Technical Field
The invention relates to the field of unmanned aerial vehicle countermeasures, in particular to a method for improving the position offset of a focus clear point of a telephoto lens in the unmanned aerial vehicle countermeasure industry.
Background
Because the unmanned aerial vehicle 'low-slow small' is difficult to detect, discover and track, the advantage that the details of the visible light imaging image are outstanding is beneficial to timely discovery and disposal of the unmanned aerial vehicle, and more monitoring data than radar and thermal imaging can be obtained on the visible light image, so that more and more telephoto lenses are applied to the anti-unmanned aerial vehicle detection project, and the focal length of the lens is usually 300 mm-800 mm, so that the unmanned aerial vehicle target can be timely discovered and tracked for disposal.
Because the focal length and the depth of field are in inverse proportion on the premise that the aperture is constant and the size of the shot object in the view frame is constant, the longer the focal length is, the shallower the depth of field is. Because the imaging lens is generally used outdoors, when searching an aerial unmanned aerial vehicle target, the aerial environment is simple. With the lengthening of the focal length of the zoom lens, the imaging field of view becomes smaller, and the shallow depth of field effect is obvious. When the position of a focus clear point of a visible light lens is slightly deviated due to the change of the environmental temperature, the target image of the unmanned aerial vehicle in the sky is blurred, and due to the low-slow characteristic of the unmanned aerial vehicle, the target is easily lost when the equipment automatically focuses, and the background is simple and the manual focusing is not easy to operate due to the fact that the background is under the sky background, so that the telephoto lens is required to be always in the clear position within the wide temperature range in one day.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for improving the position offset of the focus clear point of a telephoto lens, which can obviously improve the position offset of the focus clear point of the telephoto lens caused by the change of the environmental temperature.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: a method for improving the focus clear point position offset of a telephoto lens comprises the following steps:
s01), connecting and integrating the visible light imaging lens and the camera in an imaging system, wherein the imaging system has the functions of serial port communication, returning focusing, zooming feedback values and current lens internal temperature values;
s02), placing the imaging system in a high and low temperature test box, opening a box door, adjusting the focal length of the visible light imaging lens to the longest focus, manually focusing to enable the lens to be aligned with a target to clearly image, wherein the distance between the target and the lens is 1.5 km-3 km;
s03), recording a focusing feedback value and a temperature feedback value returned by the imaging system under the condition of opening the box door;
s04), closing the high-low temperature test chamber door, readjusting the focusing position of the lens in the closed state of the chamber door, and clearly imaging the same target in the step S02);
s05), recording a focusing feedback value returned by the imaging system under the test condition of closing the box door, and recording the difference value of the focusing feedback values before and after the high-low temperature test box door is closed;
s06), taking the normal temperature in the high-low temperature test chamber as a starting point, raising the temperature of the high-low temperature test chamber once every 10 ℃ within the temperature range of-20 ℃ to 60 ℃ to perform high-temperature test, and waiting for 2 to 3 hours after setting the temperature every time;
s07), after waiting for 2-3 hours, clearly imaging the target at 1.5 km-3 km through focusing of a voltage control lens, and repeating the steps S02), S03), S04) and S05); setting new temperature again according to the same temperature interval, and waiting for 2-3 hours after setting is finished;
s08), when the high-low temperature test chamber is raised to about 60 ℃, recording data, setting the temperature to be the initial normal temperature, waiting for 4 hours, adjusting and reducing the temperature of the high-low temperature test chamber once at an interval of 10 ℃, waiting for 2-3 hours after each setting, and repeating the step S07);
s09), when the temperature of the high-temperature and low-temperature box is reduced to 10 ℃ or below, the focusing position of the lens is readjusted only when the box door is closed, the same target at the position from 1.5km to 3km is imaged clearly, and the focusing feedback value returned by the thermometer imaging system under the condition of testing the closed box door is recorded;
s10), analyzing the recorded data and fitting a return value curve of the focus clear point position at different temperatures;
s11), programming in the imaging system main control board, enabling the imaging system to send a focusing instruction every 30 minutes according to the current return temperature value of the temperature sensor, and calculating the focusing value by adopting an averaging method according to the return value curve relation of the focusing clear point position at different temperatures.
Further, in steps S02), S04), S07), S09), the target-to-lens distance is 2 km.
Further, in steps S06), S07), S08), 2 hours are waited after each temperature setting.
Further, after step S11), performing an outfield contrast test on the lens written with the return value curve of the focus sharpness point positions at different temperatures and the common lens with the same focal length, placing eight points in the morning outdoors at the same time, adjusting the lens to the longest focus, imaging the target at 2km with focus sharpness, and performing a contrast effect test after the ambient temperature in the afternoon is raised.
Furthermore, the focal length of the visible light imaging lens is 15-500 mm.
The invention has the beneficial effects that: the invention collects focusing feedback data at different temperatures returned by the imaging system under the conditions of opening and closing the box door in the temperature rise process within the temperature range of-20-60 ℃, and collects focusing feedback data at different temperatures returned by the imaging system under the conditions of opening and closing the box door in the temperature drop process within the temperature range of-20-60 ℃. Analyzing and fitting a return value curve of the focus clear point position at different temperatures through the recorded data; and then writing return value curves of the focusing clear point positions at different temperatures into a main control board of the imaging system, sending a focusing instruction by the imaging system every 30 minutes according to the current return temperature value of the temperature sensor, and calculating the focusing value by adopting an averaging method according to the return value curve relationship of the focusing clear point positions at different temperatures. The method can obviously improve the focus clear point position deviation of the telephoto lens caused by the change of the environmental temperature. In addition, the method is calibrated in a laboratory at the early stage and is directly used in an imaging system at the later stage, the process is simple, the operation is convenient, and the effect is obvious.
In order to ensure the guarantee performance of the high-low temperature test chamber, the glass of the chamber door adopts multilayer glass, and when the lens is placed in the chamber, the focusing feedback values of the lens when the lens focuses on the same target clearly are different when the chamber door is in an open/close state. The focusing feedback value of the lens in clear focusing on the target in the opening state of the box door can reflect the actual use environment most. However, in a low temperature range, the lens is easily broken due to temperature difference when the door is opened, so that the door cannot be opened to focus the lens on a target clearly, and only the focus feedback value when the focus is clear can be recorded when the door is closed, so as to obtain feedback data when the door is closed. In order to compensate for the error of a focusing feedback value when a lens focuses on the same target clearly in the opening/closing state of a box door, the focusing feedback value returned by an imaging system when the box door is opened and closed is recorded at the same time under the high-temperature condition, the difference value of the focusing feedback values before and after the high-low temperature test box door is closed is recorded, and data which cannot be tested by opening the box door at the low temperature is compensated by using recorded data at the high-temperature section. So design, the return value curve that can make focus clear point position under the different temperatures of fitting out laminates the in-service use environment more, and in-service use can be more accurate according to this return value curve confirms focus clear point position, improves the long-focus lens focus clear point position skew that leads to because of ambient temperature changes.
Drawings
FIG. 1 is a schematic diagram of a returned value fitting trend line of the position of the longest-focus focal clear point at different temperatures;
fig. 2 is a comparison of the final imaging effect.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
The embodiment discloses a method for improving the position offset of a focus clear point of a telephoto lens, which is used in the anti-unmanned aerial vehicle industry. The telephoto lens is a continuous zoom lens with a focal length of 15-500mm, and has a design of back focus temperature compensation and zoom whole-course clearness.
The inventor discovers through creative work that the whole-course definition can be realized in the zooming process as long as the longest-focus focusing definition of the lens is ensured due to the design of the whole-course definition and the back-focus temperature compensation of the conventional continuous zoom lens. Based on the discovery, the inventor provides a method for improving the position offset of the focal clear point of the telephoto lens, and finds out the corresponding longest focal clear point at different temperatures, namely a return value curve of the focal clear point positions at different temperatures, through test calibration. Aiming at the change of the environment temperature, the lens is guaranteed to focus clearly at the longest focus, and the telephoto lens is always clear when the long-focus lens observes the target of the remote unmanned aerial vehicle in a wide temperature range.
Specifically, the method comprises the following steps:
s01), connecting and integrating the visible light imaging lens and the camera in an imaging system, wherein the imaging system has the functions of serial port communication, returning focusing, zooming feedback values and current lens internal temperature values;
s02), placing the imaging system in a high and low temperature test box, opening a box door, adjusting the focal length of the visible light imaging lens to the longest focal length, and manually focusing to enable the lens to clearly image a target at the position of 2 km;
s03), recording a focusing feedback value and a temperature feedback value returned by the imaging system under the condition of opening the box door;
s04), closing the high-low temperature test chamber door, readjusting the focusing position of the lens when the chamber door is closed, and clearly imaging the same target at the position of 2 km;
s05), recording a focusing feedback value returned by the imaging system under the test condition of closing the box door, and recording the difference value of the focusing feedback values before and after the high-low temperature test box door is closed;
s06), taking the normal temperature in the high-low temperature test chamber as a starting point, raising the temperature of the high-low temperature test chamber once every 10 ℃ within the temperature range of-20 ℃ to 60 ℃ to perform high-temperature test, and waiting for 2 hours after setting the temperature every time;
s07), after waiting for 2 hours, focusing through the voltage control lens, imaging the target at 2 clearly, repeating steps S02), S03), S04), S05); setting new temperature again according to the same temperature interval, and waiting for 2 hours after setting is finished;
s08), when the high-low temperature test chamber is raised to about 60 ℃, recording data, setting the temperature to be the initial normal temperature, waiting for 4 hours, adjusting and reducing the temperature of the high-low temperature test chamber once at an interval of 10 ℃, waiting for 2 hours after each setting, and repeating the step S07);
s09), when the temperature of the high-temperature and low-temperature box is reduced to 10 ℃ or below, the focusing position of the lens is readjusted only when the box door is closed, the same target at the position of 2km is imaged clearly, and the focusing feedback value returned by the thermometer imaging system under the condition of testing the closed box door is recorded;
s10), analyzing the recorded data and fitting a return value curve of the focus clear point position at different temperatures;
s11), programming in the imaging system main control board, enabling the imaging system to send a focusing instruction every 30 minutes according to the current return temperature value of the temperature sensor, and calculating the focusing value by adopting an averaging method according to the return value curve relation of the focusing clear point position at different temperatures.
As shown in table 1, a table is recorded for focusing feedback values and temperature feedback values returned by the imaging system at different temperatures under the test condition of opening the high and low temperature test hatches.
TABLE 1
As shown in table 2, the tables are recorded for the focus feedback values and the temperature feedback values returned by the imaging system at different temperatures under the test condition of closing the high and low temperature test hatches.
TABLE 2
When the temperature is reduced to 10 ℃ or below, the door of the high-low temperature test chamber cannot be opened for testing, so the recorded difference of the focusing feedback values before and after the door of the high-low temperature test chamber is closed is used for compensating the focusing feedback value recorded when the temperature is reduced to 10 ℃ or below. As can be seen from tables 1 and 2, the difference between the focus feedback values before and after the door of the high and low temperature test chamber was approximately 8, and 8 was added to the data in the state where the chamber door was closed at 10 ℃.
The focus feedback value recorded when the door is opened is used as verification data at a temperature of 10 ℃ or higher, and the compensated focus feedback value is used as verification data at a temperature of 10 ℃ or lower, and the two parts of verification data constitute the data shown in table 3. And fitting a return value curve of the focus clear point position at different temperatures by using the verification data of the two parts.
As shown in table 3, it is a table of the relationship between the focus feedback value and the temperature feedback value transmitted back by the imaging system at different temperatures.
TABLE 3
The returned value curve of the focus clear point position at different temperatures fitted by step S10) is shown in fig. 1, and the relationship between the temperature and the longest focus clear point position is: y =2.6709x +237.92, where x is the temperature (° C) and y is the longest-focus clear-focus position (focus value).
And step S11), performing an outfield contrast test on the lens written with the return value curve of the focus definition point positions at different temperatures and the common lens with the same focal length, placing eight points in the morning outdoors, adjusting the lens to the longest focus, imaging a target at 2km with clear focus, and performing a contrast effect test after the afternoon ambient temperature rises. The contrast result is as shown in fig. 2, and 2a is the imaging effect of the ordinary camera lens that does not improve, and 2b is the imaging effect of improving the back camera lens, and it can be seen from fig. 2 that the imaging effect of improving the back camera lens is superior to the imaging effect of the ordinary camera lens that does not improve, and it is more clear to image, especially the imaging effect of sky, more conveniently discovers whether there is unmanned aerial vehicle in the sky.
The foregoing description is only for the basic principle and the preferred embodiments of the present invention, and modifications and substitutions by those skilled in the art are included in the scope of the present invention.
Claims (6)
1. A method for improving the position deviation of a focus clear point of a telephoto lens is characterized in that: the method comprises the following steps:
s01), connecting and integrating the visible light imaging lens and the camera in an imaging system, wherein the imaging system has the functions of serial port communication, returning focusing, zooming feedback values and current lens internal temperature values;
s02), placing the imaging system in a high and low temperature test box, opening a box door, adjusting the focal length of the visible light imaging lens to the longest focus, manually focusing to enable the lens to be aligned with a target to clearly image, wherein the distance between the target and the lens is 1.5 km-3 km;
s03), recording a focusing feedback value and a temperature feedback value returned by the imaging system under the condition of opening the box door;
s04), closing the high-low temperature test chamber door, readjusting the focusing position of the lens in the closed state of the chamber door, and clearly imaging the same target in the step S02);
s05), recording a focusing feedback value returned by the imaging system under the test condition of closing the box door, and recording the difference value of the focusing feedback values before and after the high-low temperature test box door is closed;
s06), taking the normal temperature in the high-low temperature test chamber as a starting point, raising the temperature of the high-low temperature test chamber once every 10 ℃ within the temperature range of-20 ℃ to 60 ℃ to perform high-temperature test, and waiting for 2 to 3 hours after setting the temperature every time;
s07), after waiting for 2-3 hours, clearly imaging the target at 1.5 km-3 km through focusing of a voltage control lens, and repeating the steps S02), S03), S04) and S05); setting new temperature again according to the same temperature interval, and waiting for 2-3 hours after setting is finished;
s08), when the high-low temperature test chamber is raised to about 60 ℃ and data is recorded, reducing the temperature of the high-low temperature test chamber to the temperature recorded in the step S03), after waiting for 4 hours, adjusting and reducing the temperature of the high-low temperature test chamber at an interval of 10 ℃, after each setting, waiting for 2-3 hours, and repeating the step S07);
s09), when the temperature of the high-temperature and low-temperature box is reduced to 10 ℃ or below, the focusing position of the lens is readjusted only when the box door is closed, the same target at the position from 1.5km to 3km is imaged clearly, and the focusing feedback value returned by the thermometer imaging system under the condition of testing the closed box door is recorded;
s10), analyzing the recorded data and fitting a return value curve of the focus clear point position at different temperatures;
s11), programming in the imaging system main control board, enabling the imaging system to send a focusing instruction every 30 minutes according to the current return temperature value of the temperature sensor, and calculating the focusing value by adopting an averaging method according to the return value curve relation of the focusing clear point position at different temperatures.
2. The method for improving the focus sharpness point position offset of the telephoto lens according to claim 1, wherein: and (3) compensating the focusing feedback value recorded when the temperature is reduced to 10 ℃ or below by using the difference of the recorded focusing feedback values before and after the door of the high-low temperature test chamber is closed, taking the focusing feedback value recorded when the chamber door is opened as verification data when the temperature is above 10 ℃, taking the compensated focusing feedback value as verification data when the temperature is below 10 ℃, and fitting a return value curve of the focusing clear point position at different temperatures by using the verification data of the two parts.
3. The method for improving the focus sharpness point position offset of the telephoto lens according to claim 1, wherein: step S02), S04), S07), S09), the target-to-lens distance is 2 km.
4. The method for improving the focus sharpness point position offset of the telephoto lens according to claim 1, wherein: steps S06), S07), S08), wait 2 hours after setting the temperature each time.
5. The method for improving the focus sharpness point position offset of the telephoto lens according to claim 1, wherein: and step S11), performing an outfield contrast test on the lens written with the return value curve of the focus definition point positions at different temperatures and a common lens with the same focal length, placing eight points in the morning outdoors, adjusting the lens to the longest focus, imaging a target at 2km with clear focus, and performing a contrast effect test after the ambient temperature in the afternoon is raised.
6. The method for improving the focus sharpness point position offset of the telephoto lens according to claim 1, wherein: the focal length of the visible light imaging lens is 15-500 mm.
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