CN115379109A - Method for measuring distance of telephoto lens with automatic distance measuring function - Google Patents
Method for measuring distance of telephoto lens with automatic distance measuring function Download PDFInfo
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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
- G02B7/28—Systems for automatic generation of focusing signals
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/18—Focusing aids
- G03B13/20—Rangefinders coupled with focusing arrangements, e.g. adjustment of rangefinder automatically focusing camera
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
Abstract
The application discloses a method for measuring distance by a telephoto lens with an automatic distance measuring function, which has the technical scheme that the method comprises the following steps: obtaining a distance value and a theoretical value of a focusing clear position of a motor through a test object distance experiment; forming a matrix data list and generating a target code; starting up the machine for self-checking, sampling for multiple times, and calculating an offset value; according to the change of the object distance, performing table lookup in a theoretical value information program; whether the fixed offset value is a positive direction or a negative direction is determined based on a comparison of the actual value to the focus position with a theoretical value. The method for measuring the distance of the telephoto lens with the automatic distance measuring function solves the problems that a fuzzy image occupies most of focusing time during manual focusing, time is consumed during focusing, operation is troublesome, and one-step focusing cannot be accurately achieved, simplifies focusing operation, and achieves accurate focusing.
Description
The present case is the divisional application, specifically is application number: 2018113830009, with the name: a telephoto lens based on automatic distance measurement and a method and a device for realizing automatic focusing are disclosed, and the application date is as follows: divisional application of 2018.11.20.
[ technical field ] A method for producing a semiconductor device
The application relates to the technical field of photography focusing, in particular to a method for measuring distance of a telephoto lens with an automatic distance measuring function.
[ background of the invention ]
Most of the existing methods for automatically or manually focusing a telephoto lens control the lens motor to perform global or local search to the position of the maximum clear point by acquiring image information. A large amount of algorithm judgment is needed in each searching process, the front and rear positions of the clear point of the image are searched in a roughly fuzzy mode, and then the motor is controlled back and forth to perform fine searching so as to achieve the maximum clear point. The biggest defects of the operation are that the blurred image occupies most of focusing time, the focusing period is long, the operation is complicated, and the one-step focusing cannot be accurately realized.
[ summary of the invention ]
The above-mentioned problem will be solved in this application, provides a telephoto lens based on automatic range finding.
In a first aspect, a method for ranging by using a telephoto lens with an automatic ranging function is provided, and the method for realizing automatic focusing by using the telephoto lens based on automatic ranging includes the following steps:
obtaining a distance value and a theoretical value of a focusing clear position of a motor through a test object distance experiment;
forming a matrix data list and generating a target code;
starting up the machine for self-checking, sampling for multiple times, and calculating an offset value;
according to the change of the object distance, performing table lookup in a theoretical value information program;
whether the offset value is a positive direction or a negative direction is determined based on comparing the actual value to the focus position with a theoretical value.
Further, the method for obtaining the distance value and the theoretical value of the focusing clear position of the motor through the test object distance experiment comprises the following steps:
measuring a calibration distance between the laser ranging module and a calibration environment by using the laser ranging module;
the lens focuses the calibration environment by using a motor according to the calibration distance until the image is focused clearly, and a focusing distance is obtained;
the lens reads the change value of the calibration distance in real time through serial port communication control, and assumes that the change value of the calibration distance is a distance threshold value which is a self-defined numerical value;
and if the calibration distance changes according to the distance threshold, manually changing the focusing distance of the motor until the image is focused clearly, and recording the calibration distance and the theoretical value of the focusing distance.
Further, sampling for multiple times to form a matrix data list and generate an object code, and the method comprises the following steps:
receiving initial focusing distance data recording a plurality of groups of the focusing distances;
and writing the calibration distance and the focusing distance into a theoretical value information program which is counted into a matrix form, and writing the theoretical value information program into a pre-storage module.
Further, when measuring the calibration distance, multiple sampling needs to be performed within a variation distance range of the calibration distance in different environmental scenes to obtain focus distance information at different calibration distances so as to reduce an error of the initial focus distance data.
Further, the power-on self-test includes the following steps:
calculating a difference value of a group of focus distances in the initial focus distance data, and taking an absolute value of the difference value, wherein the group of focus distances consists of front and back focus distances in the initial focus distance data;
summing a plurality of groups of the absolute values, and taking the average value of the absolute values as a fixed offset value;
the main control module controls the laser ranging module to acquire the distance value of an object corresponding to the center point of the current laser ranging module for multiple times in a serial port communication mode, takes the average value of the actual values of the distance values for multiple times as an actual calibration distance, and records the actual focusing distance of the motor at the actual calibration distance.
Further, the table lookup in the theoretical value information program according to the object distance change comprises the following steps:
and the main control module compares the actual calibration distance with the recorded theoretical value of the calibration distance to obtain the focusing distance corresponding to the initial focusing distance data with the calibration distance.
Further, determining whether the offset value is a positive direction or a negative direction based on comparing the actual value of the in-focus position with a theoretical value, comprises the steps of:
comparing the focus distance to the actual focus distance;
when the focusing distance is larger than the actual focusing distance, changing the actual focusing distance in a positive direction and compensating a set fixed offset value;
and when the focusing distance is smaller than the actual focusing distance, changing the actual focusing distance in the opposite direction and compensating the set fixed offset value, thereby realizing one-step adjustment of the actual focusing distance through distance measurement.
In a second aspect, an auto-focusing device for a telephoto lens based on automatic ranging is provided, which includes:
the telephoto lens group is used for focusing, zooming and back focus compensation of a calibration object;
the laser ranging module is used for measuring a calibration distance between the lens and a calibration environment;
the motor is used for focusing the telephoto lens on the calibration environment according to the calibration distance until the image is clearly focused and obtaining an ADC value of a focusing position;
the motor control module controls the motor to change the focusing distance according to the change of the calibration distance according to the distance threshold until the image is focused clearly;
a pre-storing processing module for storing the statistical matrixed theoretical value information program composed of the focusing distance, the theoretical value of the focusing distance and the distance threshold, and comparing the actual value of the focusing position with the theoretical value to determine whether the offset value is a positive direction or a negative direction;
the main control module is used for transmitting the focusing distance, the fixed offset value and a start-stop signal of the motor based on comparison between an actual value and a theoretical value of the focusing position;
and the serial port communication module is connected with the pre-storage processing module, the motor control module, the laser ranging module and the main control module and is used for serial communication.
In a third aspect, a telephoto lens is provided, which is characterized by comprising the focusing device described in the second aspect.
Compared with the prior art, the application has the following advantages:
according to the method and the device, a matrix data list is generated according to a distance value obtained through an object distance test and a theoretical value of a focusing clear position of a motor, a target code is generated, a power-on self-test is performed according to the change of the object distance, a table is looked up in a theoretical value information program, then the actual value of the obtained focusing position is compared, the offset value compensation is determined, the effect of rapid focusing is achieved, and the problems that a fuzzy image occupies most of focusing time during manual focusing, the focusing time is long, the operation is troublesome, and the one-step positioning cannot be accurately performed are solved.
[ description of the drawings ]
Fig. 1 is a schematic flow chart of a method for implementing auto-focusing by using a telephoto lens based on automatic ranging according to the present application.
Fig. 2 is a schematic structural diagram of an automatic focusing device implemented by a telephoto lens based on automatic ranging according to the present application.
Fig. 3 is a top view of the telephoto lens.
Fig. 4 is a side view of a telephoto lens.
[ detailed description ] embodiments
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments.
As shown in fig. 1 to 4, a method for implementing automatic focusing by a telephoto lens based on automatic distance measurement includes the following steps:
and S101, obtaining a distance value and a theoretical value of a focusing clear position of the motor through a test object distance experiment.
In the step, a laser ranging module is used for measuring a calibration distance between the laser ranging module and a calibration environment; and focusing the calibration environment by the lens by using the motor according to the calibration distance until the image is clearly focused, and obtaining a focusing distance.
Further, the lens controls and reads the change value of the calibration distance in real time through serial port communication, and assumes that the change value of the calibration distance is a distance threshold value which is a user-defined numerical value.
Further, the calibration distance changes according to the distance threshold, the focusing distance of the motor is manually changed until the image is focused clearly, and the calibration distance and the theoretical value of the focusing distance are recorded.
In this step, the entity of the calibration environment may be a person or an object; furthermore, the premise of measuring the calibration distance between the laser ranging module and the calibration environment is that the distance measuring module and the telephoto lens are required to keep the central point of the optical axis parallel.
Specifically, the laser ranging module and the telephoto lens are in an overlapped and parallel state, and the height h indicates that the height of a shot object is more than or equal to h; l is a calibration distance; the laser ranging module adopts a pulse ranging method, measures the time t between the reference pulse and the reflected pulse, and can calculate the calibration distance L: l =1/2ct where c is the speed of light.
Further, the main control module sends an instruction set command through the serial port communication module, and the laser ranging module feeds back a response command when receiving the command successfully and starts to measure the shot object to send a data command to the main control module.
The main control module controls the reading distance in real time, the distance threshold value of an object is assumed to be 10m, when the distance changes by 10m every time, the focusing position of the motor is manually adjusted until an image is focused clearly, the corresponding calibration distance and the theoretical value of the focusing distance of the motor are recorded and printed by the pre-storage processing module, and the theoretical value of the focusing distance can also be referred to as an ADC (analog to digital converter) value.
And step S102, forming a matrix data list and generating an object code.
The method comprises the following steps: sampling for multiple times to form a matrix data list and generate an object code, and the method comprises the following steps: receiving initial focusing distance data recording a plurality of groups of the focusing distances; and writing the calibration distance and the focusing distance into a theoretical value information program which is counted into a matrix form, and writing the theoretical value information program into a pre-storage module.
Furthermore, when measuring the calibration distance, multiple sampling needs to be performed within the variation distance range of the calibration distance in different environmental scenes to obtain the focus distance information at different calibration distances so as to reduce the error of the initial focus distance data.
And step S103, power-on self-test, multiple sampling and offset value calculation.
The method comprises the following steps: and calculating a difference value of a group of focusing distances in the initial focusing distance data, and taking an absolute value of the difference value, wherein the group of focusing distances consists of front and rear two focusing distances in the initial focusing distance data.
Further, a plurality of sets of the absolute values are summed and averaged to form a fixed offset value.
Further, the master control module controls the laser ranging module to repeatedly acquire the distance value of the object corresponding to the center point of the current laser ranging module in a serial port communication mode, and takes the average value of the actual values of the distance values for multiple times as the actual calibration distance, and records the actual focusing distance of the motor at the actual calibration distance.
Specifically, any one set of calibration distance values is obtained as S1 and the focusing distance of the corresponding motor is obtained as D1. Then two groups of distance values S2 and S3 between the S1 and the threshold value are obtained; s2= S1 — threshold 10m; s3= S1+ threshold 10m; respectively acquiring focusing clear position values of corresponding motors as D2 and D3; respectively calculating the difference value delta D1= | D1-D2| of the focusing distances adjacent to each other in pairs; Δ D2= | D3-D1|; the fixed offset value is Δ D = ([ delta ] D1+ [ delta ] D2)/2; specifically, the focus position information at different distances must be obtained by performing multiple sampling within the distance variation range in different environmental scenes to reduce the data list error. The data list is formed as follows:
and step S104, performing table lookup in a theoretical value information program according to the change of the object distance.
And embedding the data table into the pre-stored processing module, and calculating the fixed offset value of the object environment as a compensation value through a formula when the main control program is started and self-checked. After the self-checking is passed, the software can send a ranging command to acquire the calibration distance of the calibration environment corresponding to the current laser ranging module center point through the serial port communication module for multiple times, and the focusing position value of the current motor is recorded.
The method comprises the following steps: and the main control module compares the actual calibration distance with the recorded theoretical value of the calibration distance to obtain the focusing distance corresponding to the initial focusing distance data with the calibration distance.
Step S105 determines whether the offset value is a positive direction or a negative direction based on the comparison of the actual value of the focus position with the theoretical value.
The method comprises the following steps: determining whether the offset value is in a positive direction or a negative direction based on comparing the actual value of the in-focus position with a theoretical value, comprising: comparing the focus distance to the actual focus distance; changing the actual focusing distance in a positive direction and compensating for a set fixed offset value in response to the focusing distance being greater than the actual focusing distance; and when the focusing distance is smaller than the actual focusing distance, changing the actual focusing distance in the opposite direction and compensating the set fixed offset value, thereby realizing one-step adjustment of the actual focusing distance through distance measurement.
And after the calibration distance of the measured calibration environment is judged, obtaining a corresponding theoretical value of the focusing distance through a matrix theoretical value information program, and comparing the theoretical value of the focusing distance with the current actual value of the focusing distance of the motor. When the theoretical value of the focusing distance is larger than the actual value of the focusing distance, changing the focusing distance and setting a fixed offset value in a positive direction compensation manner; and when the theoretical value of the focusing distance is smaller than the actual value of the focusing distance, changing the focusing distance and setting a fixed offset value in the opposite direction. And reaching the required clear point position and recording the focusing position value of the current motor as the next initial value.
When the calibration is changed, the main control module sends a ranging command again to acquire the calibration distance of the calibration environment corresponding to the current center point of the laser ranging module for multiple times through the serial port communication module, and then the judging operation is repeated to call the clear point in one step.
The following is a disclosed implementation apparatus for performing disclosed method embodiments.
Fig. 2 is a schematic structural diagram of an embodiment of the apparatus 200 of the present invention, which includes: the telephoto lens group 210, the laser ranging module 220, the motor 230, the control module 240, the pre-storage processing module 250, the main control module 260 and the serial port communication module 270, which are all installed outside the lens.
A telephoto lens group 210 for focusing, zooming, and back focus compensation of a calibration object;
a laser ranging module 220 for measuring a calibration distance between the lens and a calibration environment;
a motor 230, configured to focus the telephoto lens according to the calibration distance in the calibration environment until the image is clearly focused, and obtain an ADC value of a focusing position;
the control module 240 controls the motor to change the focusing distance according to the change of the calibration distance according to the distance threshold until the image is focused clearly;
a pre-storing processing module 250, configured to store the statistical matrixed theoretical value information program composed of the focusing distance, the theoretical value of the focusing distance, and the distance threshold, and compare the actual value of the focusing position with the theoretical value to determine whether the offset value is a positive direction or a negative direction;
the main control module 260 is used for transmitting the focusing distance, a fixed offset value and a start-stop signal of the motor based on comparison between an actual value and a theoretical value of the focusing position;
and the serial port communication module 270 is connected with the pre-storage processing module, the motor control module, the laser ranging module and the main control module and used for serial communication. The specific serial port communication module 270 may be in a communication mode of RS232, RS422, RS485, or the like.
The following is a disclosed embodiment of an apparatus for carrying out the disclosed embodiment of the invention.
A telephoto lens includes an implementation device in the embodiments disclosed in the present invention.
The comparison of the specific experimental data of the carrier in the implementation,
through comparison of specific experimental data after the implementation device is installed on the telephoto lens, the time consumption of the telephoto lens can be faster when the telephoto lens is intersected with the automatic focusing mode of the existing telephoto lens.
As described above, the embodiments of the present application are explained in detail, but the present application is not limited to the above embodiments. Even if various changes are made in the present application, the protection scope of the present application is still included.
Claims (5)
1. A method for measuring distance by a long-focus lens with an automatic distance measuring function is characterized in that: comprises the following steps:
obtaining a distance value and a theoretical value of a focusing clear position of a motor through a test object distance experiment;
forming a matrix data list and generating a target code;
starting up the machine for self-checking, sampling for multiple times, and calculating an offset value;
according to the change of the object distance, performing table lookup in a theoretical value information program;
determining whether the offset value is a positive direction or a negative direction based on comparing the actual value to the focus position with a theoretical value, comprising the steps of:
comparing the focus distance with the actual focus distance;
changing the actual focusing distance in a positive direction and compensating for a set fixed offset value in response to the focusing distance being greater than the actual focusing distance;
when the focusing distance is smaller than the actual focusing distance, changing the actual focusing distance in the opposite direction and compensating the set fixed offset value, thereby realizing one-step adjustment of the actual focusing distance through distance measurement;
the power-on self-test comprises the following steps:
calculating a difference value of a group of focusing distances in initial focusing distance data, and taking an absolute value of the difference value, wherein the group of focusing distances consists of front and rear focusing distances in the initial focusing distance data;
summing a plurality of groups of the absolute values, and taking the average value of the absolute values as a fixed offset value;
the main control module controls the laser ranging module to repeatedly acquire the distance value of an object corresponding to the center point of the current laser ranging module in a serial port communication mode, takes the average value of the actual values of the distance values for multiple times as an actual calibration distance, and records the actual focusing distance of the motor at the actual calibration distance;
the distance value and the theoretical value of the focusing clear position of the motor are obtained through an experiment for testing the distance of the object, and the process comprises the following steps:
measuring a calibration distance between the laser ranging module and a calibration environment by using the laser ranging module;
the lens focuses the calibration environment by using a motor according to the calibration distance until the image is focused clearly, and a focusing distance is obtained;
the lens reads the change value of the calibration distance in real time through serial port communication control, and assumes that the change value of the calibration distance is a distance threshold value which is a self-defined numerical value;
and if the calibration distance changes according to the distance threshold, manually changing the focusing distance of the motor until the image is focused clearly, and recording the calibration distance and the theoretical value of the focusing distance.
2. The method for measuring distance by using a telephoto lens having an automatic distance measuring function according to claim 1, wherein: sampling for multiple times to form a matrix data list and generate an object code, and the method comprises the following steps:
receiving initial focusing distance data recording a plurality of groups of the focusing distances;
and writing the calibration distance and the focusing distance into a theoretical value information program which is counted into a matrix form, and writing the theoretical value information program into a pre-stored module.
3. The method for measuring distance by using a telephoto lens having an automatic distance measuring function according to claim 2, wherein: when the calibration distance is measured, the focus distance information at different calibration distances is obtained by sampling the change distance range of the calibration distance for multiple times under different environmental scenes so as to reduce the error of the initial focus distance data.
4. The method for measuring distance by using a telephoto lens having an automatic distance measuring function according to claim 1, wherein: the table lookup is carried out in a theoretical value information program according to the change of the object distance, and the method comprises the following steps:
and the main control module compares the actual calibration distance with the recorded theoretical value of the calibration distance to obtain the focusing distance corresponding to the initial focusing distance data with the calibration distance.
5. The utility model provides a device that tele lens realized auto focus based on automatic ranging which characterized in that: the method comprises the following steps:
the telephoto lens group is used for focusing, zooming and back focus compensation of a calibrated object;
the laser ranging module is used for measuring a calibration distance between the lens and a calibration environment, wherein the change value of the calibration distance is a distance threshold value, and the distance threshold value is a self-defined numerical value;
the motor is used for focusing the telephoto lens on the calibration environment according to the calibration distance until the image is clearly focused and obtaining an ADC (analog to digital converter) value of a focusing position;
the motor control module controls the motor to change the focusing distance according to the change of the calibration distance according to the distance threshold until the image is focused clearly;
the prestoring processing module is used for storing a theoretical value information program which is formed by the focusing distance, a theoretical value of the focusing distance and the distance threshold value and is counted into a matrix, and comparing an actual value of the focusing position with the theoretical value to determine whether the offset value is a positive direction or a negative direction;
the main control module is used for transmitting the focusing distance, a fixed offset value and a start-stop signal of the motor based on comparison between an actual value and a theoretical value of the focusing position;
and the serial port communication module is connected with the pre-storage processing module, the motor control module, the laser ranging module and the main control module and is used for serial communication.
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| CN201811383000.9A CN109660716B (en) | 2018-11-20 | 2018-11-20 | Telephoto lens based on automatic distance measurement and method and device for realizing automatic focusing |
| CN202111200397.5A CN115379109A (en) | 2018-11-20 | 2018-11-20 | Method for measuring distance of telephoto lens with automatic distance measuring function |
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| CN202111200397.5A Pending CN115379109A (en) | 2018-11-20 | 2018-11-20 | Method for measuring distance of telephoto lens with automatic distance measuring function |
| CN202111200396.0A Pending CN115379108A (en) | 2018-11-20 | 2018-11-20 | Telephoto lens based on automatic distance measurement |
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| CN111024242A (en) * | 2019-12-13 | 2020-04-17 | 浙江大立科技股份有限公司 | Thermal infrared imager and continuous automatic focusing method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114051091A (en) | 2022-02-15 |
| CN115379108A (en) | 2022-11-22 |
| CN109660716B (en) | 2021-11-02 |
| CN114051091B (en) | 2024-03-19 |
| CN109660716A (en) | 2019-04-19 |
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