CN113301330B - Image delay online detection method and system by using electric focusing lens - Google Patents
Image delay online detection method and system by using electric focusing lens Download PDFInfo
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- CN113301330B CN113301330B CN202110848749.1A CN202110848749A CN113301330B CN 113301330 B CN113301330 B CN 113301330B CN 202110848749 A CN202110848749 A CN 202110848749A CN 113301330 B CN113301330 B CN 113301330B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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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
- G03B43/00—Testing correct operation of photographic apparatus or parts thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/675—Focus control based on electronic image sensor signals comprising setting of focusing regions
Abstract
The invention discloses an image delay on-line detection method and system by utilizing an electric focusing lens, belonging to the technical field of image delay on-line detection of the electric focusing lens, wherein the method comprises the following steps: obtaining a first zoom value curve; obtaining a second zoom value curve; obtaining the focal length value corresponding to the first definition maximum pointf 1 Focal length value corresponding to the second sharpness maximum pointf 2 (ii) a Obtaining the focus offsetD P (ii) a According to focal length deviationD P And the uniform motion speed of the electric focusing lensVObtaining an imaging delayT delay And according to imaging delayT delay Completing the image delay on-line detection of the electric focusing lens; the system comprises a zoom curve acquisition module, a focal length value acquisition module corresponding to the highest definition point, a focal length deviation acquisition module, an imaging delay acquisition module and an image delay on-line detection module; the invention solves the problem of delay of the real-time online detection image imaging system in the operation process of the airport runway foreign matter detection system.
Description
Technical Field
The invention belongs to the technical field of image delay online detection of electric focusing lenses, and particularly relates to an image delay online detection method and system by using an electric focusing lens.
Background
The tower type airport runway foreign matter detection system selects the key position of a specific detected runway surface according to the length and the width of an airport runway, front end detection system equipment is installed on one side of the runway in different areas, a radar and a multi-sensor integrated monitoring front end and a corresponding servo device are installed on a runway side fixing frame or a runway lamp on a tower with a required height, the front end multi-sensor detection system transmits foreign matter position information to a monitoring system display end, the monitoring system adjusts a holder and an angle, a focal length, an aperture and the like according to the position, tracks, monitors and photographs foreign matters, performs intelligent analysis and processing, transmits related information to a main control system for analysis and processing of the main control system, uploads the detected foreign matter information to a command center, and sends an alarm prompt.
The monitoring system is an important eye of a tower type airport runway foreign matter detection system, and mainly adopts a focusing lens with a long focal length and a monitoring camera to realize the pair1kmForeign matter other than the above is monitored. The telephoto lens is greatly affected by temperature, light and atmospheric turbulence, and thus the auto-focusing technology is a key technology for a camera to obtain a clear image of foreign substances. The presence of camera delays often results in a bias in the estimation of the focus position in the focus control algorithm.
The conventional camera image delay detection algorithm needs special equipment, cannot detect in real time while imaging, and cannot meet the requirements of an airport runway foreign matter detection system.
Disclosure of Invention
Aiming at the defects in the prior art, the method and the system for detecting the image delay on line by using the electric focusing lens solve the problem of detecting the foreign matters in the airport on line, realize the real-time dynamic detection of the imaging delay of the foreign matter system of the airport runway, improve the focusing definition of the foreign matter detection focusing system of the airport runway without being influenced by the image delay, ensure the detection sensitivity of the focusing system of the foreign matter detection system of the airport runway, and improve the control stability of the focusing system of the foreign matter detection system of the airport runway.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the invention provides an image delay on-line detection method by utilizing an electric focusing lens, which comprises the following steps:
s1, driving the electric focusing lens to rotate at a speedVTime of movement from uniform speed to far focus positionTObtaining a first zooming curve of the image definition and the focal length of the electric focusing lens, whereinTGreater than a camera maximum delay time;
s2, driving the electric focusing lens to rotate at a speedVTime of movement to near-focus position at uniform speedTObtaining the image definition and the focal length of the electric focusing lensA second zoom curve of, whereinTGreater than a camera maximum delay time;
s3, respectively obtaining the corresponding focal length values of the first definition maximum points according to the first zooming curve and the second zooming curvef 1 Focal length value corresponding to the second sharpness maximum pointf 2 ；
S4, according to the focus value corresponding to the highest point of the first definitionf 1 Focal length value corresponding to the highest point of second definitionf 2 Obtaining the corresponding focal length value of the highest point of the first definitionf 1 Focal length value corresponding to the highest point of second definitionf 2 Focal length deviation therebetweenD P ；
S5, deviation according to focal lengthD P And the uniform motion speed of the electric focusing lensVObtaining the image delay of the electric focusing lens and detecting the imaging delay on lineT delay And according to imaging delayT delay And finishing the image delay on-line detection of the electric focusing lens.
The invention has the beneficial effects that: the image delay on-line detection method utilizing the electric focusing lens is simple, does not need special test equipment, can realize on-line detection, and does not influence the normal operation of a system; the imaging delay of the image is an important influence factor in the focusing delay of the airport runway foreign matter detection system, and the focusing deviation of a camera can be influenced, so that the image is blurred; meanwhile, the imaging delay is also a key parameter influencing the stability of the control system, and the focusing definition of the airport runway foreign matter detection system can be improved without being influenced by the image delay by measuring the imaging delay parameter, so that the detection sensitivity of the airport runway foreign matter detection system is ensured, and the control stability of the airport runway foreign matter detection system is improved.
Further, the focus offset in the step S4D P The calculation expression of (a) is as follows:
D
P
= f
2
–f
1
wherein the content of the first and second substances,f 1 representing the focus value corresponding to the first sharpness maximum,f 2 and representing the focal length value corresponding to the highest point of the second definition.
The beneficial effect of adopting the further scheme is as follows: the obtained focal length deviation is beneficial to finding the image delay of the electric focusing lens to detect the imaging delay on line.
Further, the step S5 obtains the delay of the image of the electric focusing lens for online detection of the imaging delayT delay The expression of (a) is as follows:
T
delay
= D
P
/V/2
wherein the content of the first and second substances,D P the deviation of the focal length is indicated,Vthe uniform motion speed of the electric focusing lens is shown.
The beneficial effect of adopting the further scheme is as follows: the influence of the imaging delay of the camera on the real focus of the detected image can be effectively reduced by utilizing the image delay online detection imaging delay of the electric focusing lens.
Further, the invention provides an image delay on-line detection system using an electric focusing lens, which comprises a zooming curve acquisition module, a focal length value acquisition module corresponding to the highest definition point, a focal length deviation acquisition module, an imaging delay acquisition module and an image delay on-line detection module;
the input end of the movement speed and the movement time of the zooming curve acquisition module is used as the input end of an image delay on-line detection system utilizing the electric focusing lens; a first zooming curve output end and a second zooming curve output end of the zooming curve acquisition module are respectively connected with a first zooming curve input end and a second zooming curve input end of the focal length value acquisition module corresponding to the highest point of definition in a one-to-one correspondence manner; a first focal length value output end and a second focal length value output end of the focal length value acquisition module corresponding to the highest definition point are respectively connected with a first focal length value input end and a second focal length value input end of the focal length deviation acquisition module in a one-to-one correspondence manner; the focal length deviation output end of the focal length deviation acquisition module is connected with the focal length deviation input end of the imaging delay acquisition module; the imaging delay output end of the imaging delay acquisition module is connected with the imaging delay input end of the image delay online detection module; and an image delay detection output end of the image delay online detection module is used as an output end of an image delay online detection system utilizing the electric focusing lens.
The invention has the beneficial effects that: the image delay on-line detection system utilizing the electric focusing lens is used for realizing the camera image delay detection method utilizing the electric focusing lens, and can improve the focusing definition of the airport runway foreign matter detection system without being influenced by image delay, thereby ensuring the detection sensitivity of the airport runway foreign matter detection system and improving the control stability of the airport runway foreign matter detection system.
Further, the zoom curve acquisition module comprises a first zoom curve acquisition unit and a second zoom curve acquisition unit;
the first zooming curve acquisition unit is used for driving the electric focusing lens to focus according to inputfWhen the movement speed and the movement time change from small to large, a first zooming curve of the image definition and the focal length of the electric focusing lens is obtained; the second zooming curve acquisition unit is used for acquiring the focal length of the electric focusing lens according to the drivingfAnd obtaining a second zooming curve for obtaining the image definition and the focal length of the electric focusing lens by the movement speed and the movement time when the movement speed and the movement time are changed from large to small.
The beneficial effect of adopting the further scheme is as follows: the zooming curve acquisition module drives the focal length of the electric focusing lensfChange from small to large and focal lengthfAnd respectively obtaining a first zooming curve and a second zooming curve from large to small, and providing the zooming curves for further obtaining the focal length values corresponding to the highest definition points on the zooming curves.
Further, the focal length value acquisition module corresponding to the highest definition point comprises a focal length value acquisition unit corresponding to the first highest definition point and a focal length value acquisition unit corresponding to the second highest definition point;
the focal length value acquisition unit corresponding to the first definition highest point is used for obtaining a focal length value corresponding to the first definition highest point according to the first zoom curvef 1 (ii) a The focal length value acquisition unit corresponding to the second definition highest point is used for obtaining a focal length value corresponding to the second definition highest point according to the second zoom curvef 2 。
The beneficial effect of adopting the further scheme is as follows: and the focal length value acquisition module corresponding to the highest definition point respectively acquires the focal length values corresponding to the highest definition points on the corresponding curves through the first zooming curve and the second zooming curve, and provides the focal length values corresponding to the highest definition points of the two zooming curves for further acquiring the focal length deviation.
Further, the focal length deviation obtaining module is used for obtaining a focal length value corresponding to the first definition maximum pointf 1 Focal length value corresponding to the second sharpness maximum pointf 2 Obtaining the focus offsetD P 。
The beneficial effect of adopting the further scheme is as follows: the focal length deviation acquisition module acquires a focal length value corresponding to the first definition highest pointf 1 Focal length value corresponding to the second sharpness maximum pointf 2 Calculating the difference to obtain the focal length deviationD P And delay for further acquisition of imagingT delay And providing the focus deviation between the focus values corresponding to the two highest definition points.
Further, the imaging delay acquisition module is used for acquiring the focus offsetD P And the uniform motion speed of the electric focusing lensVObtaining the image delay of the electric focusing lens and detecting the imaging delay on lineT delay 。
The beneficial effect of adopting the further scheme is as follows: the imaging delay acquisition module is used for acquiring the focus deviationD P And the uniform motion speed of the electric focusing lensVCalculating an imaging delayT delay And to further complete electricityImage delay on-line detection of dynamic focus lens to provide imaging delayT delay And the method is used for delay estimation and compensating the image focusing deviation.
Further, the image delay online detection module is used for delaying according to imagingT delay And finishing the image delay on-line detection of the electric focusing lens and outputting an image delay on-line detection result of the electric focusing lens.
The beneficial effect of adopting the further scheme is as follows: the image delay on-line detection module passes through imaging delayT delay The method and the device realize the compensation of focusing deviation caused by image delay in the image focusing adjustment process of the electric focusing lens, ensure that the focusing definition of the airport runway foreign matter detection system is not influenced by the image delay, ensure the detection sensitivity of the airport runway foreign matter detection system and improve the control stability of the airport runway foreign matter detection system.
Drawings
FIG. 1 is a schematic plane view of an image sensor with a focus of a target light focused by an electric focusing lens according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating a relationship between a focal length and a normalized image sharpness when the electric focusing lens performs delayed image capturing according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating steps of an image delay on-line detection method using an electric focusing lens according to an embodiment of the present invention.
FIG. 4 is a graph showing the relationship between the focal length and the sharpness of the normalized image when the distance between the lens and the sensor changes according to the embodiment of the present invention.
FIG. 5 is a functional block diagram of an image delay on-line detection system using an electric focusing lens according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, in an embodiment of the present invention, when a focus of light of a detected target focused by an electric focusing lens falls on a plane of an image sensor, a clear image of the detected target, which corresponds to a real focal length of the electric focusing lens, can be obtained; when the distance between the electric focusing lens and the sensor plane isf(t 1 )Orf(t 2 )When the image of the detection object on the image sensor is blurred, wherein,f(t 1 )the distance between the plane of the sensor and the electric focusing lens is shorter than the real focal distance of the electric focusing lens,f(t 2 )the distance between the plane of the sensor and the electric focusing lens is longer than the real focal distance of the electric focusing lens;
as shown in fig. 2, the normalized image sharpness gradually changes from blur to sharpness along with the change of the distance between the electric focusing lens and the sensor until reaching the sharpness maximum point, and the image sharpness gradually decreases as the distance between the electric focusing lens and the sensor continues to increase.
As shown in fig. 3, in an embodiment of the present invention, the present invention provides an image delay on-line detection method using an electric focus lens, including the steps of:
s1, driving the electric focusing lens to rotate at a speedVTime of movement from uniform speed to far focus positionTObtaining a first zooming curve of the image definition and the focal length of the electric focusing lens, whereinTGreater than a camera maximum delay time;
s2, driving the electric focusing lens to rotate at a speedVTime of movement to near-focus position at uniform speedTObtaining a second zooming curve of the image definition and the focal length of the electric focusing lens, whereinTGreater than a camera maximum delay time;
s3, respectively obtaining the corresponding focal length values of the first definition maximum points according to the first zooming curve and the second zooming curvef 1 Focal length value corresponding to the second sharpness maximum pointf 2 ；
S4, according to the focus value corresponding to the highest point of the first definitionf 1 Focal length value corresponding to the highest point of second definitionf 2 Obtaining the corresponding focal length value of the highest point of the first definitionf 1 Focal length value corresponding to the highest point of second definitionf 2 Focal length deviation therebetweenD P ；
S5, deviation according to focal lengthD P And the uniform motion speed of the electric focusing lensVObtaining the image delay of the electric focusing lens and detecting the imaging delay on lineT delay And according to imaging delayT delay And finishing the image delay on-line detection of the electric focusing lens.
As shown in fig. 4, in a practical example, since the electric focusing lens is delayed, when the focal length is changed from small to large during image capturing, the curve of the relationship between the actual focal length and the normalized image sharpness is shifted to the right, i.e., the first zooming curve; when the focal length is changed from big to small during shooting, the relation curve of the actual focal length and the definition of the normalized image is translated to the left, namely a second zooming curve; respectively obtaining the focal length value corresponding to the first definition peak according to the first zooming curve and the second zooming curve in the graph 4f 1 Focal length value corresponding to the highest point of second definitionf 2 And is andf 1 andf 2 there is a focus offset betweenD P ；
The focus offset in step S4D P The calculation expression of (a) is as follows:
D
P
= f
2
–f
1
wherein the content of the first and second substances,f 1 representing the focus value corresponding to the first sharpness maximum,f 2 and representing the focal length value corresponding to the highest point of the second definition.
The electric focusing lens obtained in the step S5Image delay on-line detection of imaging delayT delay The expression of (a) is as follows:
T
delay
= D
P
/V/2
wherein the content of the first and second substances,D P the deviation of the focal length is indicated,Vthe uniform motion speed of the electric focusing lens is shown.
The imaging delay image detection of the camera is carried out according to the imaging delay Tdelay of the image delay on-line detection of the electric focusing lens, so that the influence of the imaging delay of the camera on the real focus of the detected image can be effectively reduced, and the stability of the system is improved.
The image delay on-line detection method utilizing the electric focusing lens is simple, does not need special test equipment, can realize on-line detection, and does not influence the normal operation of the system.
As shown in fig. 5, in an embodiment of the present invention, the present invention provides an image delay online detection system using an electric focusing lens, including a zooming curve obtaining module, a focal length value obtaining module corresponding to a highest definition point, a focal length deviation obtaining module, an imaging delay obtaining module, and an image delay online detection module;
the input end of the movement speed and the movement time of the zooming curve acquisition module is used as the input end of an image delay on-line detection system utilizing the electric focusing lens; a first zooming curve output end and a second zooming curve output end of the zooming curve acquisition module are respectively connected with a first zooming curve input end and a second zooming curve input end of the focal length value acquisition module corresponding to the highest point of definition in a one-to-one correspondence manner; a first focal length value output end and a second focal length value output end of the focal length value acquisition module corresponding to the highest definition point are respectively connected with a first focal length value input end and a second focal length value input end of the focal length deviation acquisition module in a one-to-one correspondence manner; the focal length deviation output end of the focal length deviation acquisition module is connected with the focal length deviation input end of the imaging delay acquisition module; the imaging delay output end of the imaging delay acquisition module is connected with the imaging delay input end of the image delay online detection module; and an image delay detection output end of the image delay online detection module is used as an output end of an image delay online detection system utilizing the electric focusing lens.
The zoom curve acquisition module comprises a first zoom curve acquisition unit and a second zoom curve acquisition unit;
the first zooming curve acquisition unit is used for driving the electric focusing lens to focus according to inputfWhen the motion speed and the motion time change from small to large, obtaining a first zooming curve of the image definition and the electric focusing lens; the second zooming curve acquisition unit is used for acquiring the focal length of the electric focusing lens according to the drivingfAnd obtaining the image definition and a second zooming curve of the electric focusing lens by the movement speed and the movement time when the movement speed and the movement time change from large to small.
The focal length value acquisition module corresponding to the highest definition point comprises a focal length value acquisition unit corresponding to the first highest definition point and a focal length value acquisition unit corresponding to the second highest definition point;
the focal length value acquisition unit corresponding to the first definition highest point is used for obtaining a focal length value corresponding to the first definition highest point according to the first zoom curvef 1 (ii) a The focal length value acquisition unit corresponding to the second definition highest point is used for obtaining a focal length value corresponding to the second definition highest point according to the second zoom curvef 2 。
The focal length deviation acquisition module is used for acquiring a focal length value corresponding to the first definition highest pointf 1 Focal length value corresponding to the second sharpness maximum pointf 2 Obtaining the focus offsetD P 。
The imaging delay acquisition module is used for acquiring the focus offsetD P And the uniform motion speed of the electric focusing lensVObtaining the image delay of the electric focusing lens and detecting the imaging delay on lineT delay 。
The image delay on-line detection module is used for delaying according to imagingT delay Drawing for completing electric focusing lensAnd performing image delay on-line detection, and outputting an image delay on-line detection result of the electric focusing lens.
The image delay on-line detection system using the electric focusing lens, as provided in the embodiment shown in fig. 5, can implement the technical solutions shown in the above method embodiments, and the implementation principles and beneficial effects thereof are similar, and are not described herein again.
Claims (9)
1. An image delay on-line detection method by using an electric focusing lens is characterized by comprising the following steps:
s1, driving the electric focusing lens to rotate at a speedVTime of movement from uniform speed to far focus positionTObtaining a first zoom value curve of image definition and focal length of the electric focusing lens, whereinTGreater than a camera maximum delay time;
s2, driving the electric focusing lens to rotate at a speedVTime of movement to near-focus position at uniform speedTObtaining a second zoom value curve of the image definition and the focal length of the electric focusing lens, whereinTGreater than a camera maximum delay time;
s3, respectively obtaining the corresponding focal length value of the first definition peak point according to the first zoom value curve and the second zoom value curvef 1 Focal length value corresponding to the second sharpness maximum pointf 2 ；
S4, according to the focus value corresponding to the highest point of the first definitionf 1 Focal length value corresponding to the highest point of second definitionf 2 Obtaining the corresponding focal length value of the highest point of the first definitionf 1 Focal length value corresponding to the highest point of second definitionf 2 Focal length deviation therebetweenD P ；
S5, deviation according to focal lengthD P And the uniform motion speed of the electric focusing lensVObtaining the image delay of the electric focusing lens and detecting the imaging delay on lineT delay And according to imaging delayT delay And finishing the image delay on-line detection of the electric focusing lens.
2. The image delay on-line detecting method using an electric focusing lens according to claim 1, wherein the focus offset in the step S4D P The calculation expression of (a) is as follows:
D
P
= f
2
–f
1
wherein the content of the first and second substances,f 1 representing the focus value corresponding to the first sharpness maximum,f 2 and representing the focal length value corresponding to the highest point of the second definition.
3. The image delay on-line detection method using electric focusing lens according to claim 1, wherein the step S5 is to obtain the image delay on-line detection imaging delay of the electric focusing lensT delay The expression of (a) is as follows:
T
delay
= D
P
/V/2
wherein the content of the first and second substances,D P the deviation of the focal length is indicated,Vthe uniform motion speed of the electric focusing lens is shown.
4. A system of the image delay on-line detection method using the electric focusing lens according to any one of claims 1 to 3, comprising a zooming curve acquisition module, a focal length value acquisition module corresponding to a highest definition point, a focal length deviation acquisition module, an imaging delay acquisition module and an image delay on-line detection module;
the input end of the movement speed and the movement time of the zooming curve acquisition module is used as the input end of an image delay on-line detection system utilizing the electric focusing lens; a first zooming curve output end and a second zooming curve output end of the zooming curve acquisition module are respectively connected with a first zooming curve input end and a second zooming curve input end of the focal length value acquisition module corresponding to the highest point of definition in a one-to-one correspondence manner; a first focal length value output end and a second focal length value output end of the focal length value acquisition module corresponding to the highest definition point are respectively connected with a first focal length value input end and a second focal length value input end of the focal length deviation acquisition module in a one-to-one correspondence manner; the focal length deviation output end of the focal length deviation acquisition module is connected with the focal length deviation input end of the imaging delay acquisition module; the imaging delay output end of the imaging delay acquisition module is connected with the imaging delay input end of the image delay online detection module; and an image delay detection output end of the image delay online detection module is used as an output end of an image delay online detection system utilizing the electric focusing lens.
5. The image delay on-line detection system using an electric focusing lens according to claim 4, wherein the zoom curve acquisition module comprises a first zoom curve acquisition unit and a second zoom curve acquisition unit;
the first zooming curve acquisition unit is used for driving the electric focusing lens to focus according to inputfWhen the movement speed and the movement time change from small to large, a first zooming curve of the image definition and the focal length of the electric focusing lens is obtained; the second zooming curve acquisition unit is used for acquiring the focal length of the electric focusing lens according to the drivingfAnd obtaining a second zooming curve for obtaining the image definition and the focal length of the electric focusing lens by the movement speed and the movement time when the movement speed and the movement time are changed from large to small.
6. The system for on-line image delay detection using an electric focusing lens according to claim 5, wherein the focal length value acquiring module corresponding to the highest sharpness point comprises a focal length value acquiring unit corresponding to a first highest sharpness point and a focal length value acquiring unit corresponding to a second highest sharpness point;
the focal length value acquisition unit corresponding to the first definition highest point is used for obtaining a focal length value corresponding to the first definition highest point according to the first zoom curvef 1 (ii) a The second definitionThe focal length value acquisition unit corresponding to the highest point is used for obtaining a focal length value corresponding to the second definition highest point according to the second zoom curvef 2 。
7. The system according to claim 6, wherein the focus offset obtaining module is configured to obtain the focus value corresponding to the first sharpness highest point according to the focus offsetf 1 Focal length value corresponding to the second sharpness maximum pointf 2 Obtaining the focus offsetD P 。
8. The system of claim 7, wherein the image delay acquisition module is used for acquiring the image delay according to the focus offsetD P And the uniform motion speed of the electric focusing lensVObtaining the image delay of the electric focusing lens and detecting the imaging delay on lineT delay 。
9. The system of claim 8, wherein the image delay on-line detection module is configured to delay the image according to an imaging delayT delay And finishing the image delay on-line detection of the electric focusing lens and outputting an image delay on-line detection result of the electric focusing lens.
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