CN113124830A - Method and equipment for testing imaging optical gradient of camera module - Google Patents
Method and equipment for testing imaging optical gradient of camera module Download PDFInfo
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- CN113124830A CN113124830A CN202110381176.6A CN202110381176A CN113124830A CN 113124830 A CN113124830 A CN 113124830A CN 202110381176 A CN202110381176 A CN 202110381176A CN 113124830 A CN113124830 A CN 113124830A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 90
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- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
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- G—PHYSICS
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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 invention relates to the technical field of camera module testing, and discloses a method and equipment for testing imaging optical inclination of a camera module, wherein the method comprises the following steps: acquiring an ideal distance value of each interested area in the test graphic card, wherein the ideal distance value represents the distance from a lens group corresponding to the interested area to an imaging surface when the spatial frequency response maximum value point is reached; and fitting according to the ideal distance value of each region of interest to form a field curvature, performing plane fitting on the field curvature, and obtaining the imaging optical inclination of the camera module according to the obtained inclination of the plane. The inclination of the plane is obtained by reverse thrust from the actual imaging of the camera module, and the actual inclination between the lens group and the imaging surface of the image sensor can be directly and truly reflected, so that the accuracy is favorably improved.
Description
Technical Field
The invention relates to the technical field of camera module testing, in particular to a camera module imaging optical gradient testing method and testing equipment.
Background
Camera modules in electronic devices with image capturing functions, such as mobile phones, generally have an automatic focusing function, and a Voice Coil Motor (VCM) is mainly used to drive a lens assembly to approach or move away from an image sensor to complete the focusing function. When the lens assembly is assembled, or in the process of driving the lens assembly to move by the voice coil motor, the lens assembly may generate a certain inclination (tilt) with respect to an imaging surface of the image sensor.
The above-mentioned tilt formed between the lens assembly and the image sensor is an important measure of the performance of the camera module. In the prior art, when detecting the above-mentioned inclination, an infrared ranging laser is usually used to measure whether the lens group has an inclination, and the magnitude of the inclination, for example, the inclination of the lens group is detected during the lens group moving driven by a voice coil motor. The detection mode can only roughly detect the inclination degree of the lens group relative to the infrared ranging laser, and cannot actually reflect the inclination degree of the lens group relative to the imaging surface of the image sensor.
Disclosure of Invention
The invention discloses a method and equipment for testing imaging optical inclination of a camera module, which are used for accurately measuring the inclination between a lens group and an image sensor in the camera module.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for testing imaging optical inclination of a camera module, wherein the camera module comprises an image sensor, a lens group positioned on one side of an imaging surface of the image sensor and a driving component for driving the lens group to be close to or far away from the image sensor, and the imaging optical inclination of the camera module represents the inclination of the lens group relative to the imaging surface of the sensor, and the method comprises the following steps:
acquiring an ideal distance value of each interested area in the test graphic card, wherein the ideal distance value represents the distance from a lens group corresponding to the interested area to an imaging surface when the spatial frequency response maximum value point is reached;
and fitting according to the ideal distance value of each region of interest to form a field curvature, performing plane fitting on the field curvature, and obtaining the imaging optical inclination of the camera module according to the obtained inclination of the plane.
In the method for testing the imaging optical inclination of the camera module, the ideal distance value of each interested area in the test graphic card is obtained, the ideal distance values are used for fitting to form field curvature, and then the field curvature is used for fitting to form a plane; the inclination of the plane is obtained by reverse deduction from actual imaging of the camera module, and the actual inclination between the lens group and the imaging surface of the image sensor can be directly and really reflected; the degree of tilt of the detection lens group is measured relative to the infrared ranging laser, which is beneficial to improving the accuracy.
Optionally, the obtaining an ideal distance value of each region of interest in the test chart specifically includes:
acquiring a defocus curve of each region of interest;
and taking the distance from the space frequency response maximum value point lens group of each defocusing curve to an imaging surface as an ideal distance value of the region of interest.
Optionally, acquiring a defocus curve of each region of interest specifically includes:
carrying out space frequency response scanning on the test card by using a camera module, and obtaining a plurality of discrete points for each region of interest;
a plurality of discrete points for each region of interest are fitted to form a corresponding defocus curve.
Optionally, the scanning of the spatial frequency response of the test card by the camera module specifically includes:
the driving component scans the test graphic card in a mode that the first step distance drives the lens group to be close to the image sensor until the sharpness of the central area of the test graphic card reaches an optimal value;
the driving part scans the test chart in a mode that the second step distance drives the lens group to be far away from the image sensor;
wherein the second step distance is smaller than the first step distance.
Optionally, the first step size is equal to 64DAC and the second step size is equal to 16 DAC.
In a second aspect, a camera module imaging optical inclination testing device is provided, the testing device comprises a camera module, a memory and a processor, the camera module comprises an image sensor, a lens group positioned on one side of an imaging surface of the image sensor, and a driving component for driving the lens group to be close to or far away from the image sensor, and the camera module imaging optical inclination represents the inclination of the lens group relative to the imaging surface of the sensor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to perform, based on the executable instructions:
acquiring an ideal distance value of each interested area in the test graphic card, wherein the ideal distance value represents the distance from a lens group corresponding to the interested area to an imaging surface when the spatial frequency response maximum value point is reached;
and fitting according to the ideal distance value of each region of interest to form a field curvature, performing plane fitting on the field curvature, and obtaining the imaging optical inclination of the camera module according to the obtained inclination of the plane.
Compared with the prior art, the advantages of the testing equipment are the same as those of the method for testing the imaging optical inclination of the camera module provided by the technical scheme, and are not repeated herein.
Optionally, the obtaining of the ideal distance value of each region of interest in the test chart is performed, and the processor is configured to specifically perform:
acquiring a defocus curve of each region of interest;
and taking the distance from the space frequency response maximum value point lens group of each defocusing curve to an imaging surface as an ideal distance value of the region of interest.
Optionally, the acquiring the defocus curve of each region of interest is performed, and the processor is configured to specifically perform:
controlling a camera module to perform space frequency response scanning on the test card, and obtaining a plurality of discrete points for each region of interest;
a plurality of discrete points for each region of interest are fitted to form a corresponding defocus curve.
Optionally, the controlling the imaging module to perform spatial frequency response scanning on the test card is performed, and the processor is configured to specifically perform:
controlling the driving component to scan the test graphic card in a mode that the first step distance driving lens group is close to the image sensor until the sharpness of the central area of the test graphic card reaches an optimal value;
controlling the driving component to scan the test graphic card in a mode that the second step distance drives the lens group to be far away from the image sensor;
wherein the second step size is less than the first step size, and in one specific embodiment, the first step size is equal to 64DAC, and the second step size is equal to 16 DAC.
The third aspect still discloses a module of making a video recording formation of image optics gradient test equipment, and this equipment includes: the camera module posture adjusting component and the test chart card are positioned on the light emitting side of the camera module posture adjusting component; wherein the content of the first and second substances,
the camera module posture adjusting assembly comprises a first reflecting surface, a second reflecting surface and a camera module;
the first reflecting surface faces the test chart card and forms an acute angle with the surface of the test chart card;
the second reflecting surface faces the test chart card and can slide along a preset direction, the second reflecting surface is sequentially provided with a first station, a second station and a third station along the direction far away from the test chart card, when the second reflecting surface is positioned at the second station, the second reflecting surface is arranged opposite to the first reflecting surface, and the preset direction is the arrangement direction of the first reflecting surface and the test chart card;
the camera module is provided with a first test posture, a second test posture, a third test posture and a fourth test posture;
when the camera module is in the first test posture, the camera module is positioned between the first reflecting surface and the test graphic card and is used for receiving light rays from the test graphic card;
when the camera module is in the second test posture, the second reflecting surface is in the first station, the camera module faces the second reflecting surface, and light rays from the test chart are reflected to the camera module through the second reflecting surface;
when the camera module is in the third test posture, the second reflecting surface is in the second station, the camera module faces the second reflecting surface, and light rays from the test chart are reflected to the second reflecting surface through the first reflecting surface and reflected to the camera module through the second reflecting surface;
when the camera module is in the fourth test posture, the second reflecting surface is in the third station, and the camera module faces the first reflecting surface to reflect light rays from the test chart to the camera module through the first reflecting surface.
In the imaging optical inclination testing equipment of the camera module, the camera module is switched among a first testing posture, a second testing posture, a third testing posture and a fourth testing posture; in the first test posture, the light of the self-test graphic card can be directly received by the first test posture; when in the second test posture, the light rays of the self-test graphic card can be reflected by the second reflecting surface; when in the third test posture, the light rays of the test chart can be sequentially reflected by the first reflecting surface and the second reflecting surface; receiving light rays from the test card through the first reflecting surface in the fourth test posture; the module of making a video recording can be towards different angles when switching between first test gesture to fourth test gesture, and can receive the light from the test graphic card directly or indirectly always to the inclination between lens group and the image sensor tests when conveniently testing the module of making a video recording different test gestures.
Optionally, the camera module is switched among the first test posture, the second test posture, the third test posture and the fourth test posture and is in a rotating state.
Optionally, the camera module pose adjusting assembly includes a first plane mirror and a second plane mirror, where a mirror surface of the first plane mirror forms a first reflecting surface, and a mirror surface of the second plane mirror forms a second reflecting surface.
Optionally, the camera module attitude adjustment assembly includes a first triangular prism and a second triangular prism, the inclined plane of the first triangular prism forms a first reflecting surface, and the inclined plane of the second triangular prism forms a second reflecting surface.
Optionally, the first reflecting surface forms an angle of 45 ° with the surface of the test card, and the second reflecting surface forms an angle of 45 ° with the surface of the test card.
Optionally, a relay lens is further arranged between the camera module attitude adjusting assembly and the test chart.
Optionally, the test chart can slide in a direction close to or far away from the camera module posture adjusting assembly.
Drawings
Fig. 1 shows a schematic structural diagram of an imaging optical inclination testing apparatus of a camera module according to an embodiment of the present application;
FIG. 2 is a schematic view of a partial structure of the imaging optical tilt testing apparatus of the camera module shown in FIG. 1 when the camera module is in a first testing posture;
FIG. 3 is a schematic view of a partial structure of the imaging optical tilt testing apparatus of the camera module shown in FIG. 1 when the camera module is in a second testing posture;
FIG. 4 is a schematic view of a partial structure of the imaging optical tilt testing apparatus of the camera module shown in FIG. 1 when the camera module is in a third testing posture;
FIG. 5 is a schematic view of a partial structure of the imaging optical tilt testing apparatus of the camera module shown in FIG. 1 when the camera module is in a fourth testing attitude;
FIG. 6 is a schematic diagram of a test card in the imaging optical tilt testing apparatus of the camera module shown in FIG. 1;
FIG. 7 is a schematic diagram showing a defocus curve fit of an area of interest in the test card of FIG. 6;
FIG. 8 is a schematic diagram showing the defocus curves for each region of interest in the test card of FIG. 6;
FIG. 9 is a three-dimensional distribution diagram of ideal distance values corresponding to each region of interest of the test card shown in FIG. 6;
FIG. 10 illustrates a fitted field curvature of ideal distance values for each region of interest of the test card of FIG. 6;
fig. 11 shows a schematic diagram of an imaging optical inclination testing apparatus of a camera module according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
To illustrate the method for testing the imaging optical tilt of the camera module according to the embodiment of the present application, first, a device for testing the imaging optical tilt of the camera module using the method is described.
Referring to fig. 1 to 5, the imaging optical tilt testing apparatus of the camera module disclosed in the embodiment of the present application includes: the module attitude adjustment subassembly F of making a video recording and the test graphic card 12 that is located the module attitude adjustment subassembly F light-emitting side of making a video recording, the concrete style of test graphic card 12 can refer to fig. 6.
In fig. 2 to 5, the camera module posture adjustment assembly F includes a first housing 1, and a first triangular prism 3 and a second triangular prism 5 located within the first housing 1. The top of the first casing 1 in the predetermined direction P1 is provided with a light inlet, the test card 12 is aligned with the first casing 1 along the predetermined direction P and is disposed towards the light inlet of the first casing 1, and the surface of the test card 12 is exemplarily perpendicular to the predetermined direction P1.
Wherein the first triple prism 3 is located at the left middle portion in the first housing 1, the second triple prism 5 is located at the right side in the first housing 1, and is slidably switched among the first station a1, the second station a2 and the third station A3 along a preset direction P1, wherein the first station a1, the second station a2 and the third station A3 are arranged in a direction away from the test card 12. The periphery of the first prism 3 is formed by two perpendicular right-angled faces and an inclined face a connecting the two right-angled faces, wherein the inner side of the inclined face a forms a first reflecting face, one of the right-angled faces is perpendicular to the predetermined direction P1, the other right-angled face is parallel to the predetermined direction P1, and the inclined face a and the predetermined direction P1 are exemplarily at an angle of 45 degrees, and at this time, the inclined face a faces the test card 12 and forms an angle of 45 degrees with the inclined face of the test card 12. The first triangular prism 3 may be supported by providing the first support stage 2, wherein the inclined surface a may be supported by an inclined support surface of the first support stage 2.
The second triangular prism 5 has a similar configuration to the first triangular prism 3, and the inclined surface b of the second triangular prism 5 forms a second reflecting surface, and the inclined surface b faces the test card 12, and the inclined surface b is also at an angle of 45 ° to the predetermined direction P1, and the inclined surface b is illustratively in a perpendicular relationship to the inclined surface a, so that the inclined surface b is also opposite to the inclined surface a when the second triangular prism 5 is at the second station a 2.
The above-described manner of forming the first reflecting surface by the first triangular prism 3 and forming the second reflecting surface by the second triangular prism 5 is merely exemplary, and the first reflecting surface and the second reflecting surface may be formed by mirror surfaces of flat mirrors, respectively. Specifically, the camera module attitude adjustment assembly F includes a first plane mirror and a second plane mirror, and a first reflection surface is formed by a mirror surface of the first plane mirror, and a second reflection surface is formed by a mirror surface of the second plane mirror.
The camera module 6 rotates about an axis 7, the axis 7 being located between the first station a1 and the first prism 3, and being perpendicular to the preset direction P1 and parallel to the inclined plane a and the inclined plane b, respectively. The camera module 6 may specifically rotate clockwise when rotating. Referring to fig. 2, when the camera module 6 is in the first test posture, the camera module 6 is located between the first triple prism 3 and the test card 12, and a light collecting port of the camera module faces the test card 12, so as to directly receive light from the test card 12, and at this time, an imaging surface of an image sensor of the camera module 6 is substantially parallel to the test card 12; referring to fig. 3, the second prism 5 is at the first station a1, the camera module 6 is rotated 90 ° clockwise around the axis 7 from the first test posture, the daylight opening of the camera module 6 faces the inclined plane b, and the light from the test chart card 12 is reflected into the camera module 6 through the second reflection plane; referring to fig. 4, the second prism 5 is located at the second station a2, the camera module 6 rotates clockwise by 90 ° around the axis 7 from the first test posture to reach a third test posture, the camera module 6 is located on the upper side of the inclined plane b, and the lighting port faces the inclined plane b away from the test chart card 12, and light from the test chart card 12 is reflected to the second reflection plane (inclined plane b) through the first reflection plane (inclined plane a) and reflected to the lighting port of the camera module 6 through the second reflection plane (inclined plane b); referring to fig. 5, the second triple prism 5 is at the third station a3, the camera module 6 is rotated 90 ° clockwise around the axis 7 from the first test posture, the camera module 6 is rotated to the right side of the first triple prism 3 with its daylight opening facing the first reflective surface (slope a), and light from the test card 12 is reflected to the daylight opening of the camera module 6 via the first reflective surface.
It should be noted that the above slope a and slope b forming an angle of 45 ° with the surface of the test card 12 are only exemplary, and any acute angle can satisfy the reflection relationship between the slope a and the slope b.
In the imaging optical inclination testing equipment of the camera module, the camera module 6 is switched among a first testing posture, a second testing posture, a third testing posture and a fourth testing posture; in the first test pose, light from test card 12 may be detected by directly receiving light in the first test pose; in the second test pose, light from test card 12 may be reflected by the second reflective surface; in the third test attitude, the light rays from the test card 12 can be reflected sequentially by the first reflecting surface and the second reflecting surface; in the fourth test attitude, light from test card 12 is received through the first reflective surface; when the camera module 6 is switched from the first test posture to the fourth test posture, the camera module can face different angles and can always directly or indirectly receive the light rays from the test graphic card 12, so that the inclination between the lens group and the image sensor can be conveniently tested when the camera module 6 is in different test postures.
In addition, still be equipped with relay lens 8 between camera module gesture adjustment subassembly F and the test graphic card 12, adopt relay lens 8 can simulate different object distances. The situation that the voice coil motor of some camera modules can focus within 350mm can be added with a test chart corresponding to the actual object distance without using a relay lens.
In the specific setting, in order to improve the integration level and isolate the optical interference, the test card 12, the relay lens 8, and the camera module posture adjustment assembly F are integrated in the second housing 13. Specifically, the camera module posture adjustment assembly F is located at the bottom of the second housing 13, the side wall of the second housing 13 is relatively provided with guide rails 14a and 14b along the preset direction, and two ends of the test card 12 are respectively provided with a stepping motor 10a and 10b to drive the test card 12 to reciprocate along the guide rails 14a and 14b in the preset direction P1, so as to achieve the purpose of adjusting the object distance. The stepping motors 10a and 10b may be replaced with other driving devices. Thereby, the purpose of adjusting the object distance is achieved.
Wherein, the back of the test chart 12 is further provided with a backlight plate 11, and the backlight plate 11 provides uniform backlight for the test chart 12.
The embodiment of the application further provides a method for testing the imaging optical inclination of the camera module, wherein the camera module 6 comprises an image sensor, a lens group located on one side of an imaging surface of the image sensor, and a driving component used for driving the lens group to be close to or far away from the image sensor, and the imaging optical inclination (tilt) of the camera module represents the inclination of the lens group relative to the imaging surface of the sensor.
The method for testing the imaging optical inclination of the camera module can specifically adopt the equipment for testing the imaging optical inclination of the camera module provided by the embodiment to detect.
The method specifically comprises the following steps:
referring to fig. 7, which shows the defocus curve of an area of Interest (roi) in the test chart 12, the abscissa in fig. 7 represents the distance moved by the voice coil motor, and the ordinate represents the Spatial Frequency Response (SFR), first, a Spatial Frequency Response scan (SFR sweep) is performed on the test chart 12 by using the camera module 6, and a plurality of discrete points are obtained for each area of Interest (Region of Interest); then, a plurality of discrete points of each region of interest are fitted to form a defocus curve corresponding to the region of interest. The manner of acquiring the defocus curve of each region of interest is not limited to the above manner.
Referring to fig. 8, fig. 8 shows the defocus curves of each region of interest in the test chart 12, wherein an ideal distance value (distance from the lens group to the imaging surface) of each region of interest in the test chart 12 can be obtained according to the abscissa corresponding to the maximum point of spatial frequency response of each defocus curve, and the ideal distance value represents the distance from the lens group to the imaging surface at the maximum point of spatial frequency response of the region of interest.
Fig. 9 shows a three-dimensional distribution diagram of the ideal distance values of each region of interest, in which the X axis and the Y axis respectively represent actual distance values obtained by converting the side edges of the test chart 12 in two directions by pixels, the Z axis represents ideal distance values, the ideal distance values of each region of interest can be obtained from fig. 9, the ideal distance values of each region of interest are fitted to form a field curvature (see fig. 10 in particular), the field curvature is subjected to plane fitting, and the imaging optical tilt of the camera module is obtained according to the obtained tilt of the plane.
In the method for testing the imaging optical inclination of the camera module, the ideal distance value of each interested area in the test graphic card 12 is obtained, the ideal distance values are used for fitting to form field curvature, and then the field curvature is used for fitting to form a plane; the inclination of the plane is obtained by reverse deduction from actual imaging of the camera module 6, and the actual inclination between the lens group and the imaging plane of the image sensor can be directly and truly reflected; the degree of tilt of the detection lens group is measured relative to the infrared ranging laser, which is beneficial to improving the accuracy.
In a specific embodiment, the scanning of the spatial frequency response of the test card 12 by the camera module 6 may specifically include:
the driving component scans the test graphic card 12 in a mode that the first step distance drives the lens group to be close to the image sensor until the sharpness of the central area of the test graphic card 12 reaches an optimal value;
the driving component scans the test card 12 in a manner that the lens group is driven away from the image sensor by a second step distance;
wherein the second step distance is smaller than the first step distance.
In a specific embodiment, the first step distance is equal to 64DAC and the second step distance is equal to 16DAC, wherein DAC represents the minimum unit of drive current for a drive component (e.g., a drive motor).
Based on the similar inventive concept of the imaging optical inclination testing method of the camera module, the embodiment of the application further provides a camera module imaging optical inclination testing device, the testing device comprises a camera module, a memory 132 and a processor 131, the camera module 6 comprises an image sensor, a lens group located on one side of an imaging surface of the image sensor, and a driving component for driving the lens group to be close to or far away from the image sensor, and the imaging optical inclination of the camera module represents the inclination of the lens group relative to the imaging surface of the sensor;
wherein the processor 131 is configured to perform, based on the executable instructions:
acquiring an ideal distance value of each interested area in the test chart 12, wherein the ideal distance value represents the distance from a lens group corresponding to the spatial frequency response maximum value point of the interested area to an imaging surface;
the ideal distance value of each interested area can be obtained from fig. 9, the field curvature is formed according to the fitting of the ideal distance value of each interested area, the field curvature is subjected to plane fitting, and the imaging optical inclination of the camera module is obtained according to the obtained inclination of the plane.
The camera module imaging optical tilt testing apparatus 130 according to this embodiment of the present application is described below with reference to fig. 11. The camera module imaging optical tilt testing apparatus 130 shown in fig. 11 is only an example, and should not bring any limitation to the functions and the application range of the embodiment of the present application.
As shown in fig. 11, the components of the camera module imaging optical tilt testing apparatus 130 may include, but are not limited to: the at least one processor 131, the at least one memory 132, and a bus 133 that connects the various system components (including the memory 132 and the processor 131).
Bus 133 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a processor, or a local bus using any of a variety of bus architectures.
The memory 132 may include readable media in the form of volatile memory, such as Random Access Memory (RAM)1321 and/or cache memory 1322, and may further include Read Only Memory (ROM) 1323.
The camera module imaging optical tilt test device 130 may also communicate with one or more external devices 134 (e.g., keyboard, pointing device, etc.), with one or more devices that enable a user to interact with the camera module imaging optical tilt test device 130, and/or with any device (e.g., router, modem, etc.) that enables the camera module imaging optical tilt test device 130 to communicate with one or more other electronic devices. Such communication may occur via input/output (I/O) interfaces 135. Also, the camera module imaging optical tilt testing device 130 may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via a network adapter 136. As shown, the network adapter 136 communicates with the other modules for the camera module imaging optical tilt test apparatus 130 via bus 133. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the camera module imaging optical tilt testing apparatus 130, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Performing the acquisition of the ideal distance value for each region of interest in the test chart 12, the processor 131 is configured to specifically perform:
and acquiring a defocusing curve of each interested area, and taking the distance from the space frequency response maximum value point lens group of each defocusing curve to an imaging surface as an ideal distance value of the interested area.
Wherein, FIG. 8 shows the defocus curves of each region of interest in the test chart 12; according to the abscissa corresponding to the maximum value point of the spatial frequency response of each defocus curve, an ideal distance value (distance from the lens group to the imaging surface) of each interested area in the test chart 12 can be obtained, wherein the ideal distance value represents the distance from the lens group to the imaging surface at the maximum value point of the spatial frequency response corresponding to the interested area.
In a specific embodiment, the obtaining of the defocus curves of each region of interest is performed, and the processor 131 is configured to specifically perform:
controlling the camera module 6 to perform spatial frequency response scanning on the test graphic card 12, and obtaining a plurality of discrete points for each region of interest, wherein the discrete points can refer to fig. 7;
a plurality of discrete points for each region of interest are fitted to form a corresponding defocus curve.
In an embodiment, the camera module is controlled to perform spatial frequency response scanning on the test card 12, and the processor 131 is configured to perform:
controlling the driving component to scan the test graphic card 12 in a mode that the first step distance driving lens group is close to the image sensor until the sharpness of the central area of the test graphic card 12 reaches an optimal value;
controlling the driving part to scan the test card 12 in a manner that the second step distance drives the lens group to be far away from the image sensor;
wherein the second step size is less than the first step size, and in one specific embodiment, the first step size is equal to 64DAC, and the second step size is equal to 16 DAC.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (17)
1. The utility model provides a camera module group formation of image optics gradient test method, camera module group includes image sensor, is located image sensor's image surface one side lens assembly, and is used for driving the lens assembly and is close to or keep away from image sensor's drive assembly, and camera module group formation of image optics gradient represents the gradient of lens assembly relative to the image surface of sensor, its characterized in that, the method includes:
acquiring an ideal distance value of each interested area in the test graphic card, wherein the ideal distance value represents the distance from a lens group corresponding to the interested area to an imaging surface when the spatial frequency response maximum value point is reached;
and fitting according to the ideal distance value of each region of interest to form a field curvature, performing plane fitting on the field curvature, and obtaining the imaging optical inclination of the camera module according to the obtained inclination of the plane.
2. The method according to claim 1, wherein obtaining the ideal distance value for each region of interest in the test card comprises:
acquiring a defocus curve of each region of interest;
and taking the distance from the space frequency response maximum value point lens group of each defocusing curve to an imaging surface as an ideal distance value of the region of interest.
3. The method according to claim 2, wherein acquiring the defocus curve of each region of interest specifically comprises:
carrying out space frequency response scanning on the test card by using a camera module, and obtaining a plurality of discrete points for each region of interest;
a plurality of discrete points for each region of interest are fitted to form a corresponding defocus curve.
4. The method of claim 3, wherein scanning the test card with the camera module for spatial frequency response comprises:
the driving component scans the test graphic card in a mode that the first step distance drives the lens group to be close to the image sensor until the sharpness of the central area of the test graphic card reaches an optimal value;
the driving part scans the test chart in a mode that the second step distance drives the lens group to be far away from the image sensor;
wherein the second step distance is smaller than the first step distance.
5. The method of claim 4, wherein the first step size is equal to 64DAC and the second step size is equal to 16 DAC.
6. The test equipment is characterized by comprising a camera module, a memory and a processor, wherein the camera module comprises an image sensor, a lens group positioned on one side of an imaging surface of the image sensor and a driving component for driving the lens group to be close to or far away from the image sensor, and the imaging optical inclination of the camera module represents the inclination of the lens group relative to the imaging surface of the sensor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to perform, based on the executable instructions:
acquiring an ideal distance value of each interested area in the test graphic card, wherein the ideal distance value represents the distance from a lens group corresponding to the interested area to an imaging surface when the spatial frequency response maximum value point is reached;
and fitting according to the ideal distance value of each region of interest to form a field curvature, performing plane fitting on the field curvature, and obtaining the imaging optical inclination of the camera module according to the obtained inclination of the plane.
7. The test apparatus according to claim 6, wherein the obtaining of the ideal distance value for each region of interest in the test card is performed, and the processor is configured to perform in particular:
acquiring a defocus curve of each region of interest;
and taking the distance from the space frequency response maximum value point lens group of each defocusing curve to an imaging surface as an ideal distance value of the region of interest.
8. The test apparatus of claim 7, wherein the obtaining of the defocus curve for each region of interest is performed, and wherein the processor is configured to perform in particular:
controlling a camera module to perform space frequency response scanning on the test card, and obtaining a plurality of discrete points for each region of interest;
a plurality of discrete points for each region of interest are fitted to form a corresponding defocus curve.
9. The test device of claim 8, wherein controlling the camera module to perform a spatial frequency response scan of the test card is performed, and wherein the processor is configured to perform in particular:
controlling the driving component to scan the test graphic card in a mode that the first step distance driving lens group is close to the image sensor until the sharpness of the central area of the test graphic card reaches an optimal value;
controlling the driving component to scan the test graphic card in a mode that the second step distance drives the lens group to be far away from the image sensor;
wherein the second step distance is smaller than the first step distance.
10. The test equipment of claim 9, wherein the first step size is equal to 64DAC and the second step size is equal to 16 DAC.
11. A camera module imaging optics tilt testing apparatus for performing the method of any of claims 1 to 5, comprising: the camera module posture adjusting component and the test chart card are positioned on the light emitting side of the camera module posture adjusting component; wherein the content of the first and second substances,
the camera module posture adjusting assembly comprises a first reflecting surface, a second reflecting surface and a camera module;
the first reflecting surface faces the test chart card and forms an acute angle with the surface of the test chart card;
the second reflecting surface faces the test chart card and can slide along a preset direction, the second reflecting surface is sequentially provided with a first station, a second station and a third station along the direction far away from the test chart card, when the second reflecting surface is positioned at the second station, the second reflecting surface is arranged opposite to the first reflecting surface, and the preset direction is the arrangement direction of the first reflecting surface and the test chart card;
the camera module is provided with a first test posture, a second test posture, a third test posture and a fourth test posture;
when the camera module is in the first test posture, the camera module is positioned between the first reflecting surface and the test graphic card and is used for receiving light rays from the test graphic card;
when the camera module is in the second test posture, the second reflecting surface is in the first station, the camera module faces the second reflecting surface, and light rays from the test chart are reflected to the camera module through the second reflecting surface;
when the camera module is in the third test posture, the second reflecting surface is in the second station, the camera module faces the second reflecting surface, and light rays from the test chart are reflected to the second reflecting surface through the first reflecting surface and reflected to the camera module through the second reflecting surface;
when the camera module is in the fourth test posture, the second reflecting surface is in the third station, and the camera module faces the first reflecting surface to reflect light rays from the test chart to the camera module through the first reflecting surface.
12. The camera module imaging optical tilt test apparatus of claim 11, wherein the camera module is switched between the first test attitude, the second test attitude, the third test attitude and the fourth test attitude and is in a rotated state.
13. The camera module imaging optical tilt testing apparatus of claim 11 or 12, wherein the camera module attitude adjustment assembly comprises a first flat mirror and a second flat mirror, the mirror surface of the first flat mirror forming the first reflective surface, and the mirror surface of the second flat mirror forming the second reflective surface.
14. The camera module imaging optical inclination test apparatus according to claim 11 or 12, wherein the camera module attitude adjustment assembly comprises a first triangular prism and a second triangular prism, the inclined face of the first triangular prism forming the first reflective surface and the inclined face of the second triangular prism forming the second reflective surface.
15. The apparatus for testing imaging optical tilt of camera module according to claim 11 or 12, wherein the first reflective surface is at an angle of 45 ° to the surface of the test card, and the second reflective surface is at an angle of 45 ° to the surface of the test card.
16. The apparatus for testing imaging optical tilt of camera module according to claim 11 or 12, further comprising a relay lens between the camera module attitude adjustment assembly and the test card.
17. The camera module imaging optical tilt testing apparatus of claim 11 or 12, wherein the test card is slidable in a direction towards or away from the camera module attitude adjustment assembly.
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| CN202110381176.6A CN113124830A (en) | 2021-04-09 | 2021-04-09 | Method and equipment for testing imaging optical gradient of camera module |
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| CN202110381176.6A CN113124830A (en) | 2021-04-09 | 2021-04-09 | Method and equipment for testing imaging optical gradient of camera module |
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