CN111757102B - Ultra-micro distance camera definition detection device and method - Google Patents
Ultra-micro distance camera definition detection device and method Download PDFInfo
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- CN111757102B CN111757102B CN202010768001.6A CN202010768001A CN111757102B CN 111757102 B CN111757102 B CN 111757102B CN 202010768001 A CN202010768001 A CN 202010768001A CN 111757102 B CN111757102 B CN 111757102B
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Abstract
The application provides a device and a method for detecting the definition of an ultra-micro distance camera; super little apart from camera definition detection device includes: the jig is used for fixing the mobile terminal; the image card is used for carrying out focusing test on the ultra-micro distance camera of the mobile terminal so as to carry out definition detection; the graphic card is arranged in the jig and provided with a test surface for the ultramicro-distance camera to carry out focusing test, test patterns are arranged on the test surface, and the test surface is inclined to the front end surface of the ultramicro-distance camera. Comprises a super-micro distance camera definition detection device. According to the device for detecting the definition of the ultra-micro-distance camera, the graphic card is installed in the jig, and when the graphic card is tested, the testing surface on the graphic card is inclined to the front end surface of the ultra-micro-distance camera, so that the ultra-micro-distance camera can be confirmed to be qualified in focusing; the ultramicro-range camera definition detection device can realize the detection of the ultramicro-range camera definition, and has the advantages of simple structure, low cost, simple and convenient test process and high accuracy.
Description
Technical Field
The application belongs to the technical field of ultra-micro distance camera definition detection, and particularly relates to an ultra-micro distance camera definition detection device and method.
Background
At present, automatic testing equipment is generally used for camera analysis force testing of mobile terminal complete machines such as mobile phones, tablet computers and the like; the method comprises the steps of adjusting the position of a black-and-white checkerboard graphic card to a mobile terminal through automatic test equipment, enabling the mobile terminal to shoot the black-and-white checkerboard graphic card so as to calculate SFR (spatial frequency response, Chinese, SFR) values of different fields of view, and evaluating the resolving power condition of a camera according to the SFR values. However, the resolution test method of the camera is only suitable for cameras with focusing positions at the centimeter to meter distances from the front end face of the lens or cameras with depth of field of several centimeters or even longer. With the increasing function of the camera of the mobile terminal, the arrangement of the ultra-macro lens with the functions of the magnifier and the microscope on the mobile terminal becomes a development trend of the current mobile terminal. The focusing position of the ultramicro-distance lens is millimeter-sized from the front end face of the lens, or the depth of field is micrometer-sized extremely short distance, so that the existing camera resolution testing equipment cannot carry out definition testing on the ultramicro-distance lens on the whole mobile terminal.
Disclosure of Invention
An object of the embodiment of the present application is to provide a device and a method for detecting the sharpness of an ultra macro camera, so as to solve the problem that a camera resolution testing device in the related art cannot perform the sharpness test on an ultra micro lens on a mobile terminal complete machine.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions: provided is an apparatus for detecting the sharpness of an ultra-fine pitch camera, comprising:
the jig is used for fixing the mobile terminal; and the number of the first and second groups,
the image card is used for carrying out focusing test on the ultra-micro distance camera of the mobile terminal so as to carry out definition detection;
the graphic card is arranged in the jig and provided with a test surface for the ultramicro-distance camera to carry out focusing test, test patterns are arranged on the test surface, and the test surface is inclined to the front end surface of the ultramicro-distance camera.
In an optional embodiment, a distance difference between two opposite ends of the test surface and the front end surface of the ultramicro range camera is Z, a distance between one end of the test surface and the front end surface of the ultramicro range camera is H, a distance between the other end of the test surface and the front end surface of the ultramicro range camera is D, Z = H-D, and Z is greater than or equal to a sum of a tolerance of the ultramicro range camera and a tolerance of the jig.
In an optional embodiment, the test pattern is a black-white line pair, and the density of the black-white line pair is T =1/(2S), where S is the resolution of the macro camera and T is lp/mm.
In an optional embodiment, the cross section of the graphic card is triangular or trapezoidal, and the graphic card is provided with a bottom surface which is away from the ultramicro-distance camera and is arranged in parallel with the front end surface of the ultramicro-distance camera.
In an alternative embodiment, the graphic card comprises a membrane of the test surface and a gasket for supporting the membrane to be inclined to the front end surface of the ultramicro camera.
In an alternative embodiment, the test pattern is engraved on the test face; or the test pattern is printed on the test surface.
In an optional embodiment, the jig is further provided with a light guide part, and the light guide part is arranged on the side edge of the graphic card.
In an optional embodiment, a card slot for positioning and accommodating the mobile terminal is formed in the jig.
In an optional embodiment, a cavity is formed in the jig, and the graphic card is placed in the cavity.
In an optional embodiment, the apparatus for detecting the sharpness of the ultra-fine pitch camera further includes a support plate for supporting the graphic card, and a fine-tuning member for fine-tuning a distance from the support plate to a front end surface of the ultra-fine pitch camera, wherein the support plate is supported by the fine-tuning member, and the fine-tuning member is mounted on the jig.
Another object of the embodiments of the present application is to provide a method for detecting the sharpness of an ultra-fine pitch camera, including the following steps:
providing a graphic card, wherein the graphic card is provided with a test surface for the ultra-micro distance camera to carry out focusing test, and the test surface is provided with a test pattern;
setting an ultramicro-distance camera on a mobile terminal to face the graphic card, and enabling a test surface of the graphic card to be inclined to the front end surface of the ultramicro-distance camera;
and carrying out focusing test on the ultramicro-distance camera, and judging that the definition of the ultramicro-distance camera is qualified if the ultramicro-distance camera has the test pattern with clear part on the test surface in a focusing shooting picture.
In an optional embodiment, a distance difference between two opposite ends of the test surface and the front end surface of the macro camera is Z, a distance between one end of the test surface and the front end surface of the macro camera is H, a distance between the other end of the test surface and the front end surface of the macro camera is D, Z = H-D, and Z is greater than or equal to a sum of a tolerance of the macro camera and a tolerance of the mobile terminal fixing position.
The device for detecting the definition of the ultra-micro distance camera provided by the embodiment of the application has the beneficial effects that: compared with the prior art, the ultramicro-distance camera definition detection device has the advantages that the graphic card is installed in the jig, and when the graphic card is tested, the testing surface on the graphic card is inclined to the front end surface of the ultramicro-distance camera, so that the focusing qualification of the ultramicro-distance camera can be confirmed; the ultramicro-range camera definition detection device can realize the detection of the ultramicro-range camera definition, and has the advantages of simple structure, low cost, simple and convenient test process and high accuracy.
The method for detecting the definition of the ultra-micro distance camera provided by the embodiment of the application has the beneficial effects that: compared with the prior art, the method for detecting the definition of the ultra-micro distance camera has the advantages of simple and convenient test process, high accuracy and low cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram i of a device for detecting the sharpness of an ultra-fine pitch camera according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a second apparatus for detecting the sharpness of an ultra macro camera according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a first type of graphics card according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a second type of graphics card provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a third graphics card provided in the embodiment of the present application;
fig. 6 is a schematic structural diagram of a fourth graphics card provided in the embodiment of the present application;
fig. 7 is a schematic view of a process of detecting the sharpness of the macro camera according to the embodiment of the present disclosure;
fig. 8 is a schematic flow chart of a method for detecting the sharpness of a macro camera according to an embodiment of the present disclosure.
Wherein, in the drawings, the reference numerals are mainly as follows:
100-a super-micro-distance camera definition detection device;
11-a jig; 111-card slot; 112-positioning convex; 1121-elongated holes; 113-a screw; 114-a chamber; 12-a light guide; 13-a support plate; 14-a trim; 15-a scaffold;
20-a graphic card; 21-testing surface; 22-test pattern; 221-black and white line pair; 222-black and white chess grids; 23-a bottom surface; 24-a membrane; 25-a gasket;
91-a mobile terminal; 92-ultramicro distance camera; 93-front end face.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present application, it is to be understood that the terms "center", "front", "back", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Reference throughout this specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Referring to fig. 1 and 7, a description will now be given of a subminiature camera sharpness detection apparatus 100 provided in the present application. The ultra-micro distance camera definition detection device 100 comprises a jig 11 and a graphic card 20; the jig 11 is used for fixing the mobile terminal 91 so as to perform definition detection on the ultra-fine distance camera 92 of the mobile terminal 91; the graphic card 20 is used for focusing test of the ultra-macro camera 92 of the mobile terminal 91 to perform definition detection, the graphic card 20 is provided with a test surface 21, and the test surface 21 is provided with a test pattern 22, so that when the ultra-macro camera 92 of the mobile terminal 91 performs the focusing test, the test pattern 22 on the test surface 21 can be shot. The graphic card 20 is installed in the jig 11, so that when the mobile terminal 91 is fixed in the jig 11, the graphic card 20 can be positioned at the front side of the macro camera 92 of the mobile terminal 91, and the test surface 21 of the graphic card 20 is adjacent to the front end surface 93 of the macro camera 92 of the mobile terminal 91, so that the macro camera 92 can shoot. The front end surface 93 of the macro camera 92 is a light incident surface of the macro camera 92 during shooting, and a light incident side of the macro camera 92 is a front side of the macro camera 92. During testing, the mobile terminal 91 is fixed in the fixture 11, so that the graphic card 20 can be positioned at the front side of the ultramicro-range camera 92 of the mobile terminal 91, the testing surface 21 on the graphic card 20 is adjacent to the front end surface 93 of the ultramicro-range camera 92, and the testing surface 21 is inclined to the front end surface 93 of the ultramicro-range camera 92, so that at least part of the area on the testing surface 21 is positioned in the focal range of the ultramicro-range camera 92, and when the ultramicro-range camera 92 can shoot a part of clear testing patterns 22 on the testing surface 21, the focusing of the ultramicro-range camera 92 can be confirmed to be qualified; namely, the ultramicro-range camera definition detection device 100 can realize the detection of the definition of the ultramicro-range camera 92, and the device has the advantages of simple structure, low cost, simple and convenient test process and high accuracy.
Compared with the prior art, the device 100 for detecting the definition of the ultra-micro distance camera provided by the application has the advantages that by installing the graphic card 20 in the jig 11, the testing surface 21 on the graphic card 20 is inclined to the front end surface 93 of the ultra-micro distance camera 92 during testing, so that the ultra-micro distance camera 92 can be confirmed to be qualified in focusing; namely, the ultramicro-range camera definition detection device 100 can realize the detection of the definition of the ultramicro-range camera 92, and the device has the advantages of simple structure, low cost, simple and convenient test process and high accuracy.
In one embodiment, referring to fig. 1 and 7, a distance difference between two opposite ends of the testing plane 21 and the front end surface 93 of the macro camera 92 is Z, a distance between one end of the testing plane 21 and the front end surface 93 of the macro camera 92 is H, a distance between the other end of the testing plane 21 and the front end surface 93 of the macro camera 92 is D, Z = H-D, and Z is greater than or equal to a sum of a tolerance of the macro camera 92 and a tolerance of the jig 11. For a common camera, the focal length of the camera is several centimeters to several meters or longer away from the front end surface 93 of the camera, the machining and assembling tolerance of each part in the camera is very small relative to the focal length of the camera, and the influence on the focusing of the camera is also very small. When each part of the ultra-fine distance camera 92 is processed, manufactured, produced and assembled, certain tolerance is inevitably existed; in addition, tolerance exists in the production and manufacturing of the jig 11, and the tolerance of the jig 11 directly affects the position tolerance of the mobile terminal 91, and further directly affects the position tolerance of the macro camera on the mobile terminal 91; the tolerance of the macro camera 92 is the overall tolerance of the macro camera 92 after assembly. For the ultra-micro distance camera 92, since the focal length is millimeter or micron from the front end surface 93 of the ultra-micro distance camera 92, that is, the focal length is several millimeters to several micrometers from the front end surface 93 of the ultra-micro distance camera 92, for the very short focal length range, the processing and assembling tolerances of each component in the ultra-micro distance camera 92 and the tolerances of the jig 11 are very large, and the accumulation of the tolerances is very large compared with the focal length of the ultra-micro distance camera 92, that is, the tolerances of the ultra-micro distance camera 92 and the tolerances of the jig 11 have a very large influence on the focusing of the ultra-micro distance camera 92, which results in that the current camera testing equipment cannot be applied to the focusing detection of the ultra-micro distance camera 92. In the embodiment of the present application, the distance difference Z between the two opposite ends of the test surface 21 and the front end surface 93 of the ultra-macro camera 92 is set to be greater than or equal to the sum of the tolerance of the ultra-macro camera 92 and the tolerance of the fixture 11, so that the distance difference Z between the two opposite ends of the test surface 21 and the front end surface 93 of the ultra-macro camera 92 can compensate the influence of the tolerance of the ultra-macro camera 92 and the tolerance of the fixture 11 on the ultra-micro camera 92, thereby facilitating the focusing test of the ultra-micro camera 92 of the mobile terminal 91, and ensuring the accuracy of the test.
In one embodiment, referring to fig. 1 and 7, the graphic card 20 is made of a transparent material. Since the focal length of the macro camera 92 is very short, during testing, the distance from the testing surface 21 of the graphic card 20 to the front end surface 93 of the macro camera 92 is also very short, which may block most ambient light from reaching the graphic card 20, resulting in less light obtained by the macro camera 92, and affecting the imaging quality and the focusing speed. The graphic card 20 is made of a light-transmitting material, and light generated by a flash lamp of the mobile terminal 91 or an external light supplement lamp can reach the test surface 21 of the graphic card 20 well, so that the ultramicro-distance camera 92 can conveniently take light, focusing speed and imaging quality are improved, and accuracy and efficiency of testing are guaranteed.
In an embodiment, the test pattern 22 on the graphic card 20 may be fabricated by photolithography, so that the line edge of the test pattern 22 is kept smooth, which facilitates the focus test of the macro camera 92, reduces the influence of the edge of the test pattern 22 on the test of the macro camera 92, and improves the efficiency and accuracy of the test. In some embodiments, the test pattern 22 may also be printed on the test surface 21. Of course, in some embodiments, the test pattern 22 may be printed on the test surface 21 using ink or the like.
In one embodiment, the graphic card 20 may be made of a glass material to ensure the strength and good light transmittance of the graphic card 20. And is made of glass material, and test patterns 22 are engraved on the glass, so that the edges of the test patterns 22 can be smoother. In some embodiments, the graphics card 20 may also be made of a light-transmissive plastic or the like.
In one embodiment, the card 20 is a film made of a film material, and the test pattern 22 can be printed on the film, and the edge of the test pattern 22 can be smooth by using the film.
In an embodiment, the jig 11 is further provided with a light guide 12, the light guide 12 is disposed on a side of the graphic card 20, so that light generated by a flash lamp of the mobile terminal 91 or an external light supplement lamp can reach the testing surface 21 of the graphic card 20, and thus, the ultra-micro distance camera 92 can conveniently take light, focusing speed and imaging quality are improved, and accuracy and efficiency of testing are guaranteed.
In one embodiment, the light guide 12 is disposed around the graphic card 20 to better guide light generated by a flash lamp of the mobile terminal 91 or an external fill-in lamp to enter the testing surface 21 of the graphic card 20, thereby facilitating light extraction by the macro camera 92.
In an embodiment, referring to fig. 1, fig. 2 and fig. 7, a clamping groove 111 is formed in the jig 11, and the clamping groove 111 is arranged to receive and position the mobile terminal 91, that is, during testing, the mobile terminal 91 may be placed in the clamping groove 111 to fix the mobile terminal 91 on the jig 11. Of course, in some embodiments, a baffle may also be disposed on the fixture 11, and the mobile terminal 91 may be positioned by the baffle. In some embodiments, an elastic clip or hook may be disposed on the fixture 11 to clip and fix the mobile terminal 91.
In one embodiment, a plurality of positioning protrusions 112 are mounted on a sidewall of the card slot 111, and the mobile terminal 91 is fixed in the card slot 111 by the positioning protrusions 112, so as to facilitate positioning and fixing of the mobile terminal 91. In one embodiment, each positioning protrusion 112 is fixed on the side wall of the card slot 111 by a screw 113, and each positioning protrusion 112 is provided with a long hole 1121, the screw 113 passes through the long hole 1121 on the corresponding positioning protrusion 112 to be installed on the side wall, so that the position of the positioning protrusion 112 on the side wall can be adjusted to correct the position of the mobile terminal 91, and the ultra-fine distance camera 92 of the mobile terminal 91 can be conveniently aligned with the graphic card 20 in the fixture 11.
In one embodiment, referring to fig. 1, fig. 2 and fig. 7, a cavity 114 is formed in the jig 11, and the graphic card 20 is placed in the cavity 114. The jig 11 is provided with the cavity 114 to facilitate positioning and installation of the graphic card 20, and further facilitate positioning between the graphic card 20 and the ultra-fine pitch camera 92 of the mobile terminal 91 when the mobile terminal 91 is installed on the jig 11.
In one embodiment, light guide 12 may be disposed in cavity 114, may reduce the footprint, and may direct light into card 20.
In one embodiment, referring to fig. 1, 2 and 7, the apparatus 100 further includes a support plate 13 and a fine-tuning member 14, the card 20 is supported on the support plate 13, the support plate 13 is supported on the fine-tuning member 14, the fine-tuning member 14 is used for fine-tuning the distance between the support plate 13 and the front end surface 93 of the ultra-fine camera 92, and the card 20 is mounted on the support plate 13, so that the distance between the card 20 and the front end surface 93 of the ultra-fine camera 92 can be adjusted by the fine-tuning member 14 to adapt to the ultra-fine cameras 92 with different focal lengths.
In one embodiment, the strip 13 can be disposed in the cavity 114 of the jig 11, and the fine-tuning element 14 is used to fine-tune the position of the strip 13 in the cavity 114, so that the position of the graphic card 20 in the cavity 114 can be adjusted. This structure can reduce the thickness of the jig 11.
In one embodiment, the trim 14 may be a micrometer. In other embodiments, the trim 14 may be a precision bolt. In still other embodiments, the vernier 14 may be a combination of a bolt and a grating scale, where the position of the support plate 13 is adjusted by the bolt, and the adjusted position or distance is checked by the grating scale. Of course, in other embodiments, the fine adjustment member 14 may be other structural members capable of fine adjustment of the distance.
In one embodiment, the apparatus 100 for detecting the sharpness of the ultra-fine pitch camera further includes a bracket 15 for supporting the jig 11, wherein the bracket 15 is configured to support the jig 11, thereby facilitating the installation of the mobile terminal 91 on the jig 11.
In one embodiment, trim 14 may be mounted on a bracket 15 to facilitate supporting trim 14. In still other embodiments, the trim 14 may be directly fixed to the fixture 11.
In one embodiment, referring to fig. 2, the cross section of the card 20 is trapezoidal, and the card 20 has a bottom surface 23, where the bottom surface 23 is a surface of the card 20 facing away from the mobile terminal 91, that is, the bottom surface 23 is a surface of the card 20 facing away from the macro camera 92, and the bottom surface 23 is disposed parallel to the front end surface 93 of the macro camera 92, so that the testing surface 21 of the card 20 is supported and inclined to the front end surface 93 of the macro camera 92.
In one embodiment, referring to fig. 3, the cross section of the card 20 is triangular, and the card 20 has a bottom surface 23, where the bottom surface 23 is a surface of the card 20 facing away from the mobile terminal 91, that is, the bottom surface 23 is a surface of the card 20 facing away from the macro camera 92, and the bottom surface 23 is disposed parallel to the front end surface 93 of the macro camera 92, so that the testing surface 21 of the card 20 is supported and inclined to the front end surface 93 of the macro camera 92.
In one embodiment, referring to fig. 6, the graphic card 20 includes a membrane 24 and a pad 25, the membrane 24 has a testing surface 21 thereon, and the membrane 24 is mounted on the pad 25, and the membrane 24 is supported by the pad 25, so that the membrane 24 is inclined to the front surface 93 of the macro camera 92, and the testing surface 21 of the graphic card 20 is inclined to the front surface 93 of the macro camera 92. As in one embodiment, the membrane 24 may be a film. Of course, in other embodiments, the membrane 24 may be other sheet-like members, such as a light-transmissive plastic sheet.
In one embodiment, referring to FIG. 2, the test pattern 22 on the card 20 may be a black and white line pair 221. In other embodiments, referring to FIG. 5, the test pattern 22 on the card 20 may be a black and white grid 222. In still other embodiments, the test pattern 22 on the card 20 may be other patterns used to perform a resolution test on a camera.
In an embodiment, referring to fig. 2, the test pattern 22 on the graphic card 20 is a black-and-white line pair 221, the density of the black-and-white line pair 221 is T, the unit of T is lp/mm, and T =1/(2S), where S is the resolution of the macro camera 92, so as to better test the definition and resolution of the macro camera 92 of the mobile terminal 91 and improve the accuracy of the test.
The ultramicro-range camera definition detection device 100 in the embodiment of the application has the advantages of simple structure and low cost, and can quickly and accurately test the definition of the ultramicro-range camera 92.
Referring to fig. 7 and 8, an embodiment of the present application further provides a method for detecting a sharpness of the ultra-macro camera 92. The method for detecting the definition of the ultra-micro distance camera 92 comprises the following steps:
s1: providing a graphic card 20, wherein the graphic card 20 is provided with a test surface 21 for the ultramicro-distance camera 92 to perform focusing test, and a test pattern 22 is arranged on the test surface 21;
s2: setting an ultramicro-distance camera 92 on a mobile terminal 91 right opposite to the graphic card 20, and enabling a test surface 21 of the graphic card 20 to be inclined to a front end surface 93 of the ultramicro-distance camera 92;
s3: and the ultramicro-distance camera 92 carries out focusing test, and if the ultramicro-distance camera 92 has the test pattern 22 with clear upper part of the test surface 21 in the focusing shooting picture, the definition of the ultramicro-distance camera 92 is judged to be qualified.
The graphic card 20 has a test surface 21, and the test surface 21 has a test pattern 22, so that when the macro camera 92 of the mobile terminal 91 performs a focus test, the test pattern 22 on the test surface 21 can be photographed. During testing, the graphic card 20 is located on the front side of the ultramicro-range camera 92 of the mobile terminal 91, the testing surface 21 on the graphic card 20 is adjacent to the front end surface 93 of the ultramicro-range camera 92, and the testing surface 21 is inclined to the front end surface 93 of the ultramicro-range camera 92, so that at least part of the area on the testing surface 21 is located within the focal distance range of the ultramicro-range camera 92, when the ultramicro-range camera 92 can shoot a part of clear testing patterns 22 on the testing surface 21, it can be confirmed that the ultramicro-range camera 92 is qualified in focusing, and the testing process is simple, convenient and high in accuracy.
In one embodiment, referring to fig. 7 and 8, the distance difference between the two opposite ends of the test surface 21 and the front end surface 93 of the macro camera 92 is Z, the distance between one end of the test surface 21 and the front end surface 93 of the macro camera 92 is H, the distance between the other end of the test surface 21 and the front end surface 93 of the macro camera 92 is D, Z = H-D, and Z is greater than or equal to the sum of the tolerance of the macro camera 92 and the tolerance of the fixed position of the mobile terminal 91. When each part of the ultra-fine distance camera 92 is processed, manufactured, produced and assembled, certain tolerance is inevitably existed; in addition, when the mobile terminal 91 is mounted and fixed, a certain tolerance often exists; the tolerance of the macro camera 92 is the overall tolerance of the macro camera 92 after assembly. For the ultra-micro camera 92, since the focal length is millimeter or micron from the front end surface 93 of the ultra-micro camera 92, that is, the focal length is several millimeters to several micrometers from the front end surface 93 of the ultra-micro camera 92, for the extremely short focal length range, the processing and assembling tolerances of each component in the ultra-micro camera 92 and the tolerances of the jig 11 are very large, and the accumulation of the tolerances is very large compared with the focal length of the ultra-micro camera 92, that is, the tolerance of the ultra-micro camera 92 and the tolerance of the fixed position of the mobile terminal 91 have a very large influence on the focusing of the ultra-micro camera 92. And the distance difference Z between the two opposite ends of the test surface 21 and the front end surface 93 of the ultramicro-range camera 92 is set to be greater than or equal to the sum of the tolerance of the ultramicro-range camera 92 and the tolerance of the fixed position of the mobile terminal 91, so that the distance difference Z between the two opposite ends of the test surface 21 and the front end surface 93 of the ultramicro-range camera 92 can compensate the influence of the tolerance of the ultramicro-range camera 92 and the tolerance of the jig 11 on the ultramicro-range camera 92, and further the focusing test of the ultramicro-range camera 92 of the mobile terminal 91 can be facilitated, and the accuracy of the test can be ensured.
In one embodiment, referring to fig. 7, the graphic card 20 is made of a transparent material. Since the focal length of the macro camera 92 is very short, during testing, the distance from the testing surface 21 of the graphic card 20 to the front end surface 93 of the macro camera 92 is also very short, which may block most ambient light from reaching the graphic card 20, resulting in less light obtained by the macro camera 92, and affecting the imaging quality and the focusing speed. The graphic card 20 is made of a light-transmitting material, and light generated by a flash lamp of the mobile terminal 91 or an external light supplement lamp can reach the test surface 21 of the graphic card 20 well, so that the ultramicro-distance camera 92 can conveniently take light, focusing speed and imaging quality are improved, and accuracy and efficiency of testing are guaranteed.
In an embodiment, the test pattern 22 on the graphic card 20 may be fabricated by photolithography, so that the line edge of the test pattern 22 is kept smooth, which facilitates the focus test of the macro camera 92, reduces the influence of the edge of the test pattern 22 on the test of the macro camera 92, and improves the efficiency and accuracy of the test. In some embodiments, the test pattern 22 may also be printed on the test surface 21. Of course, in some embodiments, the test pattern 22 may be printed on the test surface 21 using ink or the like.
In one embodiment, the graphic card 20 may be made of a glass material to ensure the strength and good light transmittance of the graphic card 20. And is made of glass material, and test patterns 22 are engraved on the glass, so that the edges of the test patterns 22 can be smoother. In some embodiments, the graphics card 20 may also be made of a light-transmissive plastic or the like.
In one embodiment, the card 20 is a film made of a film material, and the test pattern 22 can be printed on the film, and the edge of the test pattern 22 can be smooth by using the film.
In one embodiment, referring to fig. 7, the cross section of the card 20 is trapezoidal, and the card 20 has a bottom surface 23, where the bottom surface 23 is a surface of the card 20 facing away from the mobile terminal 91, that is, the bottom surface 23 is a surface of the card 20 facing away from the macro camera 92, and the bottom surface 23 is disposed parallel to the front end surface 93 of the macro camera 92, so that the testing surface 21 of the card 20 is supported and inclined to the front end surface 93 of the macro camera 92.
In one embodiment, referring to fig. 3, the cross section of the card 20 is triangular, and the card 20 has a bottom surface 23, where the bottom surface 23 is a surface of the card 20 facing away from the mobile terminal 91, that is, the bottom surface 23 is a surface of the card 20 facing away from the macro camera 92, and the bottom surface 23 is disposed parallel to the front end surface 93 of the macro camera 92, so that the testing surface 21 of the card 20 is supported and inclined to the front end surface 93 of the macro camera 92.
In one embodiment, referring to fig. 6, the graphic card 20 includes a membrane 24 and a pad 25, the membrane 24 has a testing surface 21 thereon, and the membrane 24 is mounted on the pad 25, and the membrane 24 is supported by the pad 25, so that the membrane 24 is inclined to the front surface 93 of the macro camera 92, and the testing surface 21 of the graphic card 20 is inclined to the front surface 93 of the macro camera 92.
In one embodiment, referring to FIG. 2, the test pattern 22 on the card 20 may be a black and white line pair 221. In other embodiments, referring to FIG. 5, the test pattern 22 on the card 20 may be a black and white grid 222. In still other embodiments, the test pattern 22 on the card 20 may be other patterns used to perform a resolution test on a camera.
In an embodiment, referring to fig. 2, the test pattern 22 on the graphic card 20 is a black-and-white line pair 221, the density of the black-and-white line pair 221 is T, the unit of T is lp/mm, and T =1/(2S), where S is the resolution of the macro camera 92, so as to better test the definition and resolution of the macro camera 92 of the mobile terminal 91 and improve the accuracy of the test.
The method for detecting the sharpness of the ultra-macro camera 92 according to the embodiment of the present application can be implemented by using the apparatus 100 for detecting the sharpness of the ultra-macro camera according to the embodiment of the present application.
The method for detecting the definition of the ultra-micro distance camera 92 has the advantages of simple and convenient test process, high accuracy and low cost.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. Super little apart from camera definition detection device, its characterized in that includes:
the jig is used for fixing the mobile terminal; and the number of the first and second groups,
the image card is used for carrying out focusing test on the ultra-micro distance camera of the mobile terminal so as to carry out definition detection;
the graphic card is arranged in the jig, the graphic card is provided with a test surface for the ultramicro-distance camera to carry out focusing test, test patterns are arranged on the test surface, and the test surface is inclined to the front end surface of the ultramicro-distance camera; wherein, the test face slope in the preceding terminal surface setting of super microspur camera specifically is: and setting the distance difference between the two opposite ends of the test surface and the front end surface of the ultramicro-distance camera to be larger than or equal to the sum of the tolerance of the ultramicro-distance camera and the tolerance of the jig.
2. The apparatus for detecting the sharpness of a subminiature camera according to claim 1, further comprising: the test pattern is a black and white line pair, the density of the black and white line pair is T =1/(2S), wherein S is the resolution of the ultra-fine distance camera, and the unit of T is lp/mm.
3. The apparatus for detecting the sharpness of a subminiature camera according to claim 1, further comprising: the cross section of the graph card is triangular or trapezoidal, the graph card is provided with a bottom surface deviating from the ultramicro distance camera, and the bottom surface is parallel to the front end surface of the ultramicro distance camera.
4. The apparatus for detecting the sharpness of a subminiature camera according to claim 1, further comprising: the graphic card comprises a membrane of the testing surface and a gasket for supporting the membrane to be inclined to the front end surface of the ultramicro-distance camera.
5. The apparatus for detecting the sharpness of a subminiature camera according to any one of claims 1 to 4, wherein: the test pattern is photoetched on the test surface; or the test pattern is printed on the test surface.
6. The apparatus for detecting the sharpness of a subminiature camera according to any one of claims 1 to 4, wherein: the jig is also provided with a light guide part, and the light guide part is arranged on the side edge of the drawing card.
7. The apparatus for detecting the sharpness of a subminiature camera according to any one of claims 1 to 4, wherein: a clamping groove used for positioning and containing the mobile terminal is formed in the jig.
8. The apparatus for detecting the sharpness of a subminiature camera according to any one of claims 1 to 4, wherein: a containing cavity is formed in the jig, and the graphic card is arranged in the containing cavity.
9. The apparatus for detecting the sharpness of a subminiature camera according to any one of claims 1 to 4, wherein: the device for detecting the definition of the ultra-micro distance camera further comprises a support plate for supporting the graphic card and a fine adjustment piece for fine adjusting the distance between the support plate and the front end face of the ultra-micro distance camera, wherein the support plate is supported on the fine adjustment piece, and the fine adjustment piece is installed on the jig.
10. The method for detecting the definition of the ultra-micro distance camera is characterized by comprising the following steps of:
providing a jig, wherein the jig is used for fixing the mobile terminal;
providing a graphic card, wherein the graphic card is provided with a test surface for the ultra-micro distance camera to carry out focusing test, and the test surface is provided with a test pattern;
setting an ultramicro-distance camera on a mobile terminal to face the graphic card, and enabling a test surface of the graphic card to be inclined to the front end surface of the ultramicro-distance camera; wherein, the test face slope in the preceding terminal surface setting of super microspur camera specifically is: setting the distance difference between the two opposite ends of the test surface and the front end surface of the ultramicro-distance camera to be larger than or equal to the sum of the tolerance of the ultramicro-distance camera and the tolerance of the jig;
and carrying out focusing test on the ultramicro-distance camera, and judging that the definition of the ultramicro-distance camera is qualified if the ultramicro-distance camera has the test pattern with clear part on the test surface in a focusing shooting picture.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010768001.6A CN111757102B (en) | 2020-08-03 | 2020-08-03 | Ultra-micro distance camera definition detection device and method |
| PCT/CN2021/104252 WO2022028172A1 (en) | 2020-08-03 | 2021-07-02 | Super-macro camera definition detection device and method |
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| CN202010768001.6A CN111757102B (en) | 2020-08-03 | 2020-08-03 | Ultra-micro distance camera definition detection device and method |
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| CN111757102B (en) * | 2020-08-03 | 2022-03-15 | Oppo广东移动通信有限公司 | Ultra-micro distance camera definition detection device and method |
| CN113542729B (en) * | 2021-06-28 | 2024-03-19 | 惠州Tcl云创科技有限公司 | Camera resolution obtaining method and device, intelligent terminal and storage medium |
| CN115314633B (en) * | 2022-06-27 | 2023-06-16 | 中国科学院合肥物质科学研究院 | Camera focusing method, camera focusing device, computer equipment and storage medium |
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| CN111757102A (en) | 2020-10-09 |
| WO2022028172A1 (en) | 2022-02-10 |
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