CN113984347A - Sensor back focal structure detection system comprising fixed structure - Google Patents
Sensor back focal structure detection system comprising fixed structure Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The application discloses a sensor back focal structure detection system comprising a fixed structure, wherein one end of a linkage mechanism in the detection system is connected to a lens focal ring of an image acquisition device, and the other end of the linkage mechanism is connected to a power unit so as to rotate the lens focal ring; the first shot template and the second shot template are sequentially arranged in front of the image acquisition equipment; the control unit is electrically connected with the image acquisition equipment and the power unit and is used for controlling the image acquisition equipment to acquire a first image of the first shooting template when the first shooting template is in a vertical state, acquiring a second image of the second shooting template when the first shooting template is in a horizontal state and judging whether the rear focus structure manufacturing precision of the image acquisition equipment meets a preset precision threshold value according to the definition of the two images. Through the technical scheme in this application, whether qualified detection of burnt structure installation after accomplishing automatically, when reducing the human cost, promoted precision and reliability that burnt structure detected after effectively.
Description
Technical Field
The application relates to the technical field of camera detection devices, in particular to a sensor back focal structure detection system comprising a fixed structure.
Background
With the improvement of living standards of people, image acquisition equipment has entered the aspects of people's lives. The body shadow can be seen from the smart phone to industrial automatic production. Current image capture devices typically capture images through a sensor chip that focuses light through a lens to the rear.
In the manufacturing process of the image acquisition device, a sensor board bearing a sensor chip is generally attached to a back focus gasket, the back focus gasket is aligned with a lens back shell bearing a lens, and a structure formed by the sensor board, the back focus gasket and the lens back shell is a back focus structure. Therefore, the manufacturing accuracy of the back focus structure, i.e., the accuracy of the posture between the sensor chip and the lens, has a great influence on the imaging performance of the image capturing apparatus.
In the prior art, the qualified detection mode of the manufacturing precision of the back focus structure is to adopt auxiliary measuring tools such as a vernier caliper and the like to carry out manual measurement and detection, and when the distance error among the sensor plate, the back focus gasket and the lens back shell is within a certain range, the manufacturing precision of the back focus structure is determined to meet the imaging quality requirement.
The post-focus structure detection mode of manual measurement spot check not only needs a lot of manpower, has high cost and low efficiency, but also has the possibility of missing detection and false detection because the reliability cannot be guaranteed.
Disclosure of Invention
The purpose of this application lies in: the problem of among the prior art back burnt structure make precision detection need artifical manual measurement is solved.
The technical scheme of the application is as follows: there is provided a sensor back focus structure detection system comprising a fixed structure, the detection system comprising: the system comprises a linkage mechanism, a power unit, a first shooting template, a second shooting template and a control unit; one end of the linkage mechanism is connected with a lens focal ring of the image acquisition equipment, the other end of the linkage mechanism is connected with the power unit, and the linkage mechanism is used for rotating the lens focal ring under the driving of the power unit; the first shooting template and the second shooting template are arranged in an image shooting area of the image acquisition equipment in a front-back sequence, wherein the first shooting template can be switched from a vertical state to a horizontal state or from the horizontal state to the vertical state under the driving of a power unit; the control unit is electrically connected with the image acquisition equipment and the power unit, is used for controlling the image acquisition equipment to acquire a first image of a first shot template when the first shot template is in a vertical state and acquire a second image of a second shot template when the first shot template is in a horizontal state, and is also used for judging whether the back focus structure manufacturing precision of the image acquisition equipment meets a preset precision threshold value according to the definition of the first image and the definition of the second image.
In any one of the above technical solutions, further, the power unit includes: a first power unit and a second power unit; the control end of the first power unit is electrically connected to the first output end of the control unit, the rotating end of the first power unit is connected to the linkage mechanism, and when the first power unit rotates, the lens focal ring is rotated from the initial position to the end position or is rotated from the end position to the initial position through the linkage mechanism; the control end of the second power unit is electrically connected to the second output end of the control unit, the rotating end of the power unit is connected to the connecting rod of the first photographed template, and the first photographed template is converted to the horizontal state from the vertical state or is converted to the vertical state from the horizontal state when the second power unit rotates.
In any one of the foregoing technical solutions, further, the first image at least includes a near-focus start image, a near-focus peak image, and a near-focus end image, the power unit at least includes a first power unit and a second power unit, the control unit is configured to control the image acquisition device to acquire the first image of the first photographic template when the first photographic template is in the vertical state, and specifically includes: 101, a control unit controls a second power unit to rotate so as to place a first shooting template in a vertical state and controls a first power unit to place a lens focal ring at an initial position through a linkage mechanism; step 102, a control unit controls an image acquisition device to acquire a near-focus initial image; 103, the control unit controls the first power unit to rotate so as to drive the lens focal ring to rotate to a first peak position and control the image acquisition equipment to acquire a near-focus peak image, wherein the first peak position is the position of the lens focal ring when the definition is at the maximum value when the first shot template is shot; and step 104, the control unit continuously controls the first power unit to rotate so as to place the lens focal ring at the termination position through the linkage mechanism and control the image acquisition equipment to acquire a near-focus termination image.
In any one of the above technical solutions, the first photographic template further includes: a texture target and an auxiliary illumination light source; the texture target is arranged on the shot surface of the first shot template; the auxiliary lighting source is arranged on the back of the texture target, electrically connected to the control unit and used for providing backlight for the texture target.
In any of the above technical solutions, further, the control unit is further configured to control the auxiliary illumination light source to perform exposure before acquiring the first image.
In any of the above technical solutions, further, the auxiliary lighting source at least includes a direct current light source.
In any of the above technical solutions, further, the auxiliary lighting source further includes an infrared light source.
In any one of the above technical solutions, further, the second image at least includes a far focus start image, a far focus peak image, and a far focus end image, and the control unit is configured to control the image acquisition device to acquire the second image of the second photographic template when the first photographic template is in a horizontal state, specifically including: step 201, the control unit controls the second power unit to rotate so as to place the first shot template in a horizontal state and controls the first power unit to place the lens focal ring at an initial position through a linkage mechanism; step 202, the control unit controls the image acquisition equipment to acquire an afocal initial image; step 203, the control unit controls the first power unit to rotate so as to drive the lens focal ring to rotate to a second peak value position, and controls the image acquisition equipment to acquire a far-focus peak value image, wherein the second peak value position is the position of the lens focal ring when the definition is at the maximum value when a second shot template is shot; and step 204, the control unit continuously controls the first power unit to rotate so as to place the lens focal ring at the termination position through the linkage mechanism and control the image acquisition equipment to acquire the far focus termination image.
In any one of the foregoing technical solutions, further, the first image at least includes a near focus start image, a near focus peak image, and a near focus end image, the second image at least includes a far focus start image, a far focus peak image, and a far focus end image, the rear focus structure manufacturing accuracy at least includes a tilt error and a distance error, and the control unit is further configured to determine whether the rear focus structure manufacturing accuracy of the image acquisition device meets a preset accuracy threshold according to the sharpness of the first image and the second image, and specifically includes: step 301, judging whether the definition values of the near-focus peak value image and the far-focus peak value image are within a definition standard threshold value, if so, executing step 302, and if not, judging that the inclination angle error in the manufacturing precision of the back focus structure does not meet the preset precision threshold value; step 302, respectively calculating a near focus margin according to the definition of the near focus starting image, the near focus peak image and the near focus ending image, and calculating a far focus margin according to the definition of the far focus starting image, the far focus peak image and the far focus ending image; and 303, respectively judging whether the near-focus allowance and the far-focus allowance are within allowance standard thresholds, if so, judging that the manufacturing precision of the rear focus structure meets a preset precision threshold, and if not, judging that the distance error in the manufacturing precision of the rear focus structure does not meet the preset precision threshold, wherein the preset precision threshold comprises a definition standard threshold and an allowance standard threshold.
In any of the above technical solutions, further, the near-focus margin at least includes a near-focus starting margin and a near-focus ending margin, where the near-focus starting margin is a ratio of a resolution of the near-focus starting image to a resolution of the near-focus peak image, and the near-focus ending margin is a ratio of the resolution of the near-focus ending image to the resolution of the near-focus peak image; the far focus allowance at least comprises a far focus starting allowance and a far focus stopping allowance, wherein the far focus starting allowance is a ratio of the definition of a far focus starting image to the definition of a far focus peak value image, and the far focus stopping allowance is a ratio of the definition of a far focus stopping image to the definition of a far focus peak value image.
The beneficial effect of this application is:
technical scheme in this application, through the camera lens focus ring position of adjusting image acquisition equipment, acquire the nearly burnt initial image of first shot template respectively, nearly burnt peak value image and nearly burnt termination image, and the far burnt initial image of second shot template, far burnt peak value image and far burnt termination image, through the definition numerical value of above-mentioned six images, so that the automatic qualified detection of precision is made to the back burnt structure of accomplishing image acquisition equipment, when having reduced the human cost, can effectively promote detection precision and reliability, the condition of undetected, the false retrieval has been avoided.
In a preferred implementation manner of the present application, in the detection, by performing group detection on the sharpness values corresponding to the six images, two detection methods with mutually independent error type determination modes are provided, and the error types of the back focus structure can be obtained by analyzing the detection intermediate quantity, including: 1. whether the error type is the inclination error can be known by analyzing the difference between the individual and the standard definition peak value; 2. whether the error type is a distance error can be known by analyzing the difference of the individual and the standard starting and ending definition values. The reliability of the precision detection of the rear focus structure is further improved, and effective detection data can be provided for subsequent repair work.
In another preferred implementation manner of the present application, the configuration of the first photographic template and the second photographic template is optimized, and not only is an auxiliary illumination light source arranged as a backlight source, so that the problem of image formation flicker caused by automatic exposure under an alternating-current light source is effectively solved, but also the detection precision of a back focus structure is improved, and the dependence of a detection system on a detection environment is reduced. In addition, the template is set to be in a mesh shape with irrelevant areas, the tolerance for the structural error of the detection system is high, and the problem of large imaging difference caused by the difference of camera view fields caused by the structural error of the detection system can be solved. In addition, in order to effectively solve the problem of low detection efficiency of the high-resolution low-frame-rate camera, an image region of interest (ROI) is set so as to ensure that the fields of view of image acquisition devices (such as cameras) of different models are consistent in the detection process and improve the consistency of the detection result.
Drawings
The advantages of the above and/or additional aspects of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic block diagram of a sensor back focus structure detection system including a fixed structure according to one embodiment of the present application;
FIG. 2 is a schematic diagram of a first photographic template, according to an embodiment of the present application;
FIG. 3 is a schematic flow diagram of a back focus structure detection according to an embodiment of the present application;
fig. 4 is a schematic flow diagram of a method of image sharpness calculation according to an embodiment of the present application.
The method comprises the steps of 1-image acquisition equipment, 2-lens focal ring, 3-linkage mechanism, 4-first shooting template, 6-second shooting template, 7-control unit, 8-first power unit and 9-second power unit.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
As can be appreciated by those skilled in the art, in the same shooting environment, for the same lens, the same model of image acquisition apparatus, the difference in imaging sharpness among different image acquisition apparatus individuals is mainly dependent on the accuracy of their back focus structures, without considering the difference in sensor and circuit structures. The relationship between the two is shown in the following aspects:
1) the relative inclination angles of the sensor plane and the lens plane are different, and the peak value definition of the image acquisition equipment is different;
2) the relative distances between the sensor plane and the lens plane are different, and the definition values of the image acquisition equipment are different when the focal ring positions are the same.
Therefore, whether the precision of the rear focus structure is qualified or not can be detected by adopting a mode of analyzing the imaging definition performance of the image acquisition equipment.
The image acquisition device in this embodiment may be an industrial camera.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a sensor back focus structure detection system including a fixed structure, the detection system including: a linkage mechanism 3, a power unit, a first shooting template 4, a second shooting template 6 and a control unit 7; one end of the linkage mechanism 3 is connected to the lens focus ring 2 of the image acquisition device 1, the other end of the linkage mechanism 3 is connected to the power unit, the linkage mechanism 3 is used for rotating the lens focus ring 2 under the driving of the power unit, and the power unit is further connected to the second shooting template 6.
It should be noted that, in this embodiment, the connection manner between the power unit and the linkage mechanism 3, the linkage mechanism 3 and the first photographic plate 4, and the power unit and the second photographic plate 6 is not limited, wherein the power unit may be implemented by a motor, such as a stepping motor, and the linkage mechanism 3 may be implemented by a structure having a linkage function, such as a conveyor belt, a chain, a gear, and the like.
In this embodiment, in order to simplify the structural design of the power unit, the power unit includes: a first power unit 8 and a second power unit 9; the control end of the first power unit 8 is electrically connected to the first output end of the control unit 7, the rotation end of the first power unit 8 is connected to the linkage mechanism 3, when the first power unit 8 rotates, the lens focal ring 2 is rotated from the initial position to the end position through the linkage mechanism 3, or the lens focal ring 2 is rotated from the end position to the initial position, so that the images shot by the image acquisition equipment 1 have different definitions, different image definition characteristics are obtained, and whether the back focal structure is qualified is judged;
in this embodiment, the control end of the second power unit 9 is electrically connected to the second output end of the control unit 7, the rotation end of the power unit is connected to the connecting rod of the first photographic template 4, and the second power unit 9 rotates to convert the first photographic template 4 from the vertical state to the horizontal state, or from the horizontal state to the vertical state.
It should be noted that the embodiment does not limit the specific implementation manner of the control unit 7 controlling the first power unit 8 and the second power unit 9.
In the present embodiment, the control unit 7 is also capable of determining whether the photographing template to which the lens of the image capturing apparatus 1 is directly facing is the first photographing template 4 or the second photographing template 6 by the state information of the second power unit 9
The first shooting template 4 and the second shooting template 6 are arranged in an image shooting area of the image acquisition device 1 in a front-back sequence, the first shooting template 4 is close to the image acquisition device 1, the second shooting template 6 is arranged behind the first shooting template 4, and the first shooting template 4 and the second shooting template 6 are objects with certain texture characteristics, wherein the first shooting template 4 can be switched from a vertical state to a horizontal state or from the horizontal state to the vertical state under the driving of a power unit.
It should be noted that, when the first photographic template 4 is in the horizontal state, the first photographic template 4 is outside the image capturing area of the image acquisition apparatus 1, and the image acquisition of the second photographic template 6 by the image acquisition apparatus 1 is not affected.
Example two:
on the basis of the above embodiment, in order to solve the problem that the difference between the captured images is large and the detection accuracy is poor due to the unstable front and back of the ambient light source, the first photographic template 4 further includes: a texture target and an auxiliary illumination light source; the texture target is arranged on the shot surface of the first shot template 4;
it should be noted that, the embodiment is not limited to the specific implementation of the texture target, and the photographed texture target should have the following characteristics: 1. the texture is clearly represented; 2. the texture representation is substantially unaffected by the auxiliary illumination light source intensity. This can be achieved as a mesh-like target consisting of mesh openings that are not area-related, i.e. of uniform size, as shown in fig. 2.
In this embodiment, the auxiliary illumination light source is disposed on the back surface of the texture target, the auxiliary illumination light source is electrically connected to the control unit 7, and the auxiliary illumination light source is configured to provide backlight to the texture target, so as to ensure that the image acquisition device 1 can acquire a stable light source when the first photographed template 4 is photographed.
It should be noted that the average value of the image acquired by the image acquiring apparatus 1 in this embodiment is between 105 and 135 pixels.
Further, the control unit 7 is also configured to control the auxiliary illumination light source to perform exposure before the first image is acquired. The exposure time interval is between the minimum exposure time supported by the sensor and 100000us, so as to avoid influencing the detection efficiency. If the exposure time reaches the upper limit value but the image gray average value is still not in the expected interval (105-135 pixels), the brightness of the plane light source of the auxiliary lighting light source is improved, and exposure is carried out again; if the exposure time reaches the lower limit value but the image gray value average value is still not in the expected interval, reducing the plane light source brightness of the auxiliary lighting light source, and carrying out exposure again to obtain the first image.
Preferably, the auxiliary lighting source at least comprises a direct current light source, so that the stability of the image shot by the image acquisition device 1 when the exposure time is short can be ensured, and the flicker problem does not exist.
Preferably, the auxiliary lighting source further comprises an infrared light source, so that the auxiliary lighting source is switched under the control of the control unit 7 to fulfill the detection requirement of the image capturing device 1 with the infrared image capturing function.
On the basis of the above-described embodiment, the control unit 7 is electrically connected to the image capturing apparatus 1 and the power unit, and the control unit 7 is configured to control the image capturing apparatus 1 to capture a first image of the first photographic plate 4 when the first photographic plate 4 is in the vertical state, and to capture a second image of the second photographic plate 6 when the first photographic plate 4 is in the horizontal state.
It should be noted that, in order to solve the problem that the detection accuracy is low due to the slow acquisition frame rate of the high resolution sensor caused by bandwidth limitation in the detection of different models of the image acquisition devices 1 in the image acquisition process, the control unit 7 needs to set the image region of interest ROI of the image acquisition device 1 before acquiring the first image and the second image, and the process specifically includes:
step A, calculating the expected side length of the field of view according to the focal length of the lens of the image acquisition device 1 and the shooting distance between the first shot template 4 or the second shot template 6 and the image acquisition device 1, wherein the corresponding calculation formula is as follows:
in the formula, nROILenTmp is the predicted side length of the field of view, fFieldLen is the required side length of the field of view, and is a preset value, fDis the shooting distance, fFocus is the focal length of the lens, and finitcellsize is the pixel size of the image acquisition device 1.
The above physical quantities are all in the unit of meter, and the unit of nROILenTmp is a similar number.
Step B, determining the side length of the shooting field of view according to the size relation between the predicted side length of the field of view and the minimum value of the side length of the image acquisition equipment 1, and determining the ROI of the image according to the side length of the shooting field of view, wherein a calculation formula corresponding to the side length of the shooting field of view is as follows:
in the formula, nROILen is the side length of the shooting field of view, and nImgSize is the minimum value of the side length of the image, where the minimum value of the side length of the image nImgSize is the minimum value of the image width or the minimum value of the image height of the image capturing apparatus 1, and the unit thereof is the number of pixels.
As shown in fig. 3, this embodiment shows a flow of back focus structure detection, and when starting detection, near focus detection of the back focus structure is completed first, and then far focus detection is completed, where a method of the near focus detection is basically similar to a method of the far focus detection, and a condition for switching a near-far focus detection state is as follows: and (4) if the near focus detection is qualified, performing the near focus detection first, and performing the far focus detection after the near focus detection passes.
In this embodiment, the direction in which the lens focus ring 2 of the image pickup apparatus 1 rotates clockwise is set to the positive direction.
On the basis of the above embodiment, the present embodiment shows a specific implementation manner of acquiring the first image by the image acquisition apparatus 1, where the first image at least includes the near-focus start image, the near-focus peak image, and the near-focus end image, the power unit at least includes the first power unit 8 and the second power unit 9, and the process of controlling the image acquisition apparatus 1 to acquire the first image of the first photographic template 4 when the first photographic template 4 is in the vertical state specifically includes:
step 101, after setting an image region of interest ROI of the image acquisition device 1, the control unit 7 controls the second power unit 9 to rotate so as to place the first photographic template 4 in a vertical state, and controls the first power unit 8 to place the lens focus ring 2 at an initial position through the linkage mechanism 3;
step 102, the control unit 7 controls the image acquisition device 1 to acquire a near focus initial image;
103, the control unit 7 controls the first power unit 8 to rotate so as to drive the lens focal ring 2 to rotate to a first peak position, and controls the image acquisition device 1 to acquire a near-focus peak image, wherein the first peak position is a position of the lens focal ring 2 when the definition is at a maximum value when the first shot template 4 is shot;
in step 104, the control unit 7 continues to control the first power unit 8 to rotate so as to place the lens focus ring 2 at the end position through the linkage 3 and control the image acquiring apparatus 1 to acquire the near focus end image.
It should be noted that the start position and the end position are not necessarily different from the first peak position, that is, the first peak position may be the start position or the end position, and may be any position between the start position and the end position.
In this embodiment, in order to determine whether the lens focal ring 2 is located at the start position or the end position, a corresponding limit sensor may be installed on the lens, and when the lens focal ring 2 is adjusted to the start position or the end position, a corresponding limit signal may be triggered to the control unit 7, and then the control unit 7 determines the position.
Furthermore, the present embodiment may also determine whether the current focus ring is in a static state by analyzing image features, and when the focus ring is in the static state, the focus ring may be determined to be located at the initial position or the end position by combining a preset power unit moving direction, where the determination is based on that the image sharpness is not changed substantially when the lens focus ring 2 is in the static state; when the lens focal ring 2 moves, the image definition changes significantly.
Therefore, when the sharpness value is stable and the power unit movement direction is positive, the lens focus ring 2 is in the end position; when the sharpness value is stable and the power unit moves in the reverse direction, the lens focus ring 2 is at the initial position.
Correspondingly, in this embodiment, the second image at least includes a far-focus start image, a far-focus peak image, and a far-focus end image, and the control unit 7 is configured to control the image acquisition device 1 to acquire the second image of the second photographic template 6 when the first photographic template 4 is in the horizontal state, and specifically includes:
step 201, the control unit 7 controls the second power unit 9 to rotate so as to place the first shooting template 4 in a horizontal state, and controls the first power unit 8 to place the lens focal ring 2 at an initial position through the linkage mechanism 3;
step 202, the control unit 7 controls the image acquisition device 1 to acquire an afocal initial image;
step 203, the control unit 7 controls the first power unit 8 to rotate so as to drive the lens focal ring 2 to rotate to a second peak position, and controls the image acquisition device 1 to acquire a far-focus peak image, wherein the second peak position is the position of the lens focal ring 2 when the definition is at the maximum value when the second photographed template 6 is photographed;
in step 204, the control unit 7 continues to control the first power unit 8 to rotate so as to place the lens focus ring 2 at the end position through the linkage 3 and control the image acquiring apparatus 1 to acquire the telephoto end image.
In this embodiment, the control unit 7 is further configured to determine whether the back focus structure manufacturing accuracy of the image acquisition device 1 meets a preset accuracy threshold according to the definitions of the first image and the second image.
Specifically, in the present embodiment, a near-focus peak value and a far-focus peak value are introduced to determine a relative inclination angle between a sensor (board) plane and a lens (rear housing) plane in a rear-focus structure, where the near-focus peak value is a sharpness value of a near-focus peak image, the near-focus peak image is an image when the sharpness is at a maximum value when the first photographed template 4 is photographed, the far-focus peak value is a sharpness value of a far-focus peak image, and the far-focus peak image is an image when the sharpness is at a maximum value when the second photographed template 6 is photographed.
And the relative distance between the plane of the sensor (plate) and the plane of the lens (rear shell) in the rear focal structure is judged by introducing the near focal allowance and the far focal allowance, so that the manufacturing precision of the rear focal structure can be detected in an all-around manner. The near-focus allowance at least comprises a near-focus starting allowance and a near-focus ending allowance, wherein the near-focus starting allowance is a ratio of the definition of a near-focus starting image to the definition of a near-focus peak image, and the near-focus ending allowance is a ratio of the definition of a near-focus ending image to the definition of the near-focus peak image; the far focus allowance at least comprises a far focus starting allowance and a far focus stopping allowance, wherein the far focus starting allowance is a ratio of the definition of a far focus starting image to the definition of a far focus peak value image, and the far focus stopping allowance is a ratio of the definition of a far focus stopping image to the definition of a far focus peak value image.
On the basis of the foregoing embodiment, this embodiment further illustrates an implementation manner of determining the accuracy of the back focus structure, where the first image at least includes a near focus start image, a near focus peak image, and a near focus end image, the second image at least includes a far focus start image, a far focus peak image, and a far focus end image, and the control unit 7 is further configured to determine whether the accuracy of the back focus structure manufacture of the image acquisition device 1 meets a preset accuracy threshold according to the sharpness of the first image and the second image, where the accuracy of the back focus structure manufacture at least includes an inclination error and a distance error, and the process specifically includes:
step 301, judging whether the definition values of the near-focus peak value image and the far-focus peak value image are within a definition standard threshold value, if so, executing step 302, and if not, judging that the inclination angle error in the manufacturing precision of the back focus structure does not meet the preset precision threshold value; that is to say, when the sharpness values of the near-focus peak image and the far-focus peak image are within the sharpness standard threshold, the relative inclination angle (inclination error) between the sensor (plate) plane and the lens (rear housing) plane in the rear-focus structure meets the standard of the image acquisition device 1 of the model, and there is no situation that the relative distance between the sensor (plate) plane and the lens (rear housing) plane is too large to cause the situation that the focusing cannot be clear.
Step 302, respectively calculating a near focus margin according to the definition of the near focus starting image, the near focus peak image and the near focus ending image, and calculating a far focus margin according to the definition of the far focus starting image, the far focus peak image and the far focus ending image;
and 303, respectively judging whether the near-focus allowance and the far-focus allowance are within allowance standard thresholds, if so, judging that the manufacturing precision of the rear focus structure meets a preset precision threshold, and if not, judging that the distance error in the manufacturing precision of the rear focus structure does not meet the preset precision threshold, wherein the distance error is the error of the relative distance between the plane of a sensor (plate) in the rear focus structure and the plane of a lens (rear shell).
The preset precision threshold includes a definition standard threshold and a margin standard threshold, and may be set according to the model and the design requirement of the image acquisition device 1.
It should be noted that the calculation method of the image sharpness is not limited in this embodiment, and the calculation method shown in fig. 4 may be used, or other calculation methods may also be used.
The technical solution of the present application is described in detail above with reference to the accompanying drawings, and the present application provides a sensor back focus structure detection system including a fixed structure, the detection system including: the system comprises a linkage mechanism, a power unit, a first shooting template, a second shooting template and a control unit; one end of the linkage mechanism is connected with a lens focal ring of the image acquisition equipment, the other end of the linkage mechanism is connected with the power unit, and the linkage mechanism is used for rotating the lens focal ring under the driving of the power unit; the first shooting template and the second shooting template are arranged in an image shooting area of the image acquisition equipment in a front-back sequence, wherein the first shooting template can be switched from a vertical state to a horizontal state or from the horizontal state to the vertical state under the driving of a power unit; the control unit is electrically connected with the image acquisition equipment and the power unit, is used for controlling the image acquisition equipment to acquire a first image of a first shot template when the first shot template is in a vertical state and acquire a second image of a second shot template when the first shot template is in a horizontal state, and is also used for judging whether the back focus structure manufacturing precision of the image acquisition equipment meets a preset precision threshold value according to the definition of the first image and the definition of the second image. Through the technical scheme in this application, whether qualified detection of burnt structure installation after accomplishing automatically, when reducing the human cost, promoted precision and reliability that burnt structure detected after effectively.
In the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The shapes of the various elements in the drawings are illustrative and do not preclude the existence of certain differences from the actual shapes, and the drawings are used for the purpose of illustrating the principles of the present application and are not intended to limit the present application.
Although the present application has been disclosed in detail with reference to the accompanying drawings, it is to be understood that such description is merely illustrative and not restrictive of the application of the present application. The scope of the present application is defined by the appended claims and may include various modifications, adaptations, and equivalents of the invention without departing from the scope and spirit of the application.
Claims (10)
1. Burnt structure detecting system behind sensor that contains fixed knot constructs, its characterized in that, detecting system includes: the system comprises a linkage mechanism, a power unit, a first shooting template, a second shooting template and a control unit;
one end of the linkage mechanism is connected to a lens focal ring of the image acquisition equipment, the other end of the linkage mechanism is connected to the power unit, and the linkage mechanism is used for rotating the lens focal ring under the driving of the power unit;
the first shooting template and the second shooting template are arranged in an image shooting area of the image acquisition equipment in a front-back sequence, wherein the first shooting template can be switched from a vertical state to a horizontal state or from the horizontal state to the vertical state under the driving of the power unit;
the control unit is electrically connected with the image acquisition equipment and the power unit and is used for controlling the image acquisition equipment to acquire a first image of the first shooting template when the first shooting template is in a vertical state and acquire a second image of the second shooting template when the first shooting template is in a horizontal state,
the control unit is further used for judging whether the rear focus structure manufacturing precision of the image acquisition equipment meets a preset precision threshold value according to the definition of the first image and the definition of the second image.
2. The sensor char structure detection system comprising a fixed structure of claim 1, wherein the power unit comprises: a first power unit and a second power unit;
the control end of the first power unit is electrically connected to the first output end of the control unit, the rotating end of the first power unit is connected to the linkage mechanism, and when the first power unit rotates, the lens focal ring is rotated from the initial position to the end position through the linkage mechanism, or the lens focal ring is rotated from the end position to the initial position;
the control end of the second power unit is electrically connected to the second output end of the control unit, the rotating end of the power unit is connected to the connecting rod of the first shot template, and the second power unit rotates to enable the first shot template to be converted from the vertical state to the horizontal state or from the horizontal state to the vertical state.
3. The system according to claim 1, wherein the first image includes at least a near-focus start image, a near-focus peak image, and a near-focus end image, the power unit includes at least a first power unit and a second power unit, and the control unit is configured to control the image capturing device to capture the first image of the first photographic template when the first photographic template is in a vertical state, and specifically includes:
step 101, the control unit controls the second power unit to rotate so as to place the first shooting template in the vertical state and controls the first power unit to place the lens focal ring at the initial position through the linkage mechanism;
step 102, the control unit controls the image acquisition equipment to acquire the near-focus initial image;
103, the control unit controls the first power unit to rotate so as to drive the lens focal ring to rotate to a first peak position, and controls the image acquisition equipment to acquire the near-focus peak image, wherein the first peak position is the position of the lens focal ring when the definition is at the maximum value when the first shot template is shot;
and step 104, the control unit continuously controls the first power unit to rotate so as to place the lens focal ring at the termination position through the linkage mechanism and control the image acquisition equipment to acquire the near focus termination image.
4. The fixed structure containing sensor back focus structure detection system of claim 3, wherein said first camera template further comprises: a texture target and an auxiliary illumination light source;
the texture target is arranged on the shot surface of the first shot template;
the auxiliary lighting source is arranged on the back of the texture target, electrically connected to the control unit, and used for providing backlight to the texture target.
5. The fixed structure containing sensor back focus structure detection system of claim 4, wherein said control unit is further configured to control said auxiliary illumination source to expose before acquiring said first image.
6. The fixed structure containing sensor afocal structure detection system of claim 4, wherein the auxiliary illumination source comprises at least a DC light source.
7. The fixed structure containing sensor back focus structure detection system of claim 6, wherein said auxiliary illumination source further comprises an infrared source.
8. The system according to claim 3, wherein the second image includes at least a far focus start image, a far focus peak image, and a far focus end image, and the control unit is configured to control the image capturing device to capture the second image of the second photographic template when the first photographic template is in a horizontal state, and specifically includes:
step 201, the control unit controls the second power unit to rotate so as to place the first shooting template in the horizontal state and controls the first power unit to place the lens focal ring at the initial position through the linkage mechanism;
step 202, the control unit controls the image acquisition equipment to acquire the far focus initial image;
step 203, the control unit controls the first power unit to rotate so as to drive the lens focal ring to rotate to a second peak position, and controls the image acquisition device to acquire the far focus peak image, wherein the second peak position is the position of the lens focal ring when the definition is at the maximum value when the second shot template is shot;
and 204, the control unit continuously controls the first power unit to rotate so as to place the lens focal ring at the termination position through the linkage mechanism and control the image acquisition equipment to acquire the far focus termination image.
9. The fixed structure containing sensor back focus structure detection system of claim 1, wherein said first image comprises at least a near focus start image, a near focus peak image, and a near focus end image, said second image comprises at least a far focus start image, a far focus peak image, and a far focus end image,
the control unit is further configured to determine whether the precision of the back focus structure manufacturing of the image acquisition device meets a preset precision threshold according to the definitions of the first image and the second image, and specifically includes:
step 301, judging whether the definition values of the near focus peak value image and the far focus peak value image are within a definition standard threshold value, if so, executing step 302, and if not, judging that the manufacturing precision of the rear focus structure does not meet the preset precision threshold value;
step 302, respectively calculating a near focus margin according to the definition of the near focus starting image, the near focus peak image and the near focus ending image, and calculating a far focus margin according to the definition of the far focus starting image, the far focus peak image and the far focus ending image;
step 303, respectively judging whether the near-focus residual amount and the far-focus residual amount are within a residual standard threshold, if so, judging that the rear-focus structure manufacturing precision meets the preset precision threshold, if not, judging that the rear-focus structure manufacturing precision does not meet the preset precision threshold,
wherein the preset precision threshold comprises the definition standard threshold and a margin standard threshold.
10. The fixed structure containing sensor backfocus structure detection system of claim 9, wherein,
the near-focus margin at least comprises a near-focus starting margin and a near-focus ending margin, wherein,
the near-focus initial margin is the ratio of the definition of the near-focus initial image to the definition of the near-focus peak image,
the near focus termination allowance is the ratio of the definition of the near focus termination image to the definition of the near focus peak value image;
the far focus residual at least comprises a far focus starting residual and a far focus stopping residual, wherein,
the far focus initial margin is the ratio of the definition of the far focus initial image to the definition of the far focus peak image,
the far focus termination margin is the ratio of the definition of the far focus termination image to the definition of the far focus peak image.
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