CN107561850B - Detection method of wide-angle camera module - Google Patents
Detection method of wide-angle camera module Download PDFInfo
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- CN107561850B CN107561850B CN201710669852.3A CN201710669852A CN107561850B CN 107561850 B CN107561850 B CN 107561850B CN 201710669852 A CN201710669852 A CN 201710669852A CN 107561850 B CN107561850 B CN 107561850B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B43/00—Testing correct operation of photographic apparatus or parts thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
Abstract
The invention relates to the technical field of optical camera shooting, and discloses a detection method of a wide-angle camera module, which comprises the following steps: generating a test target corresponding to the camera module to be tested, wherein the test target comprises a radial line pair test area and a tangential line pair test area, and the radial line pair test area and the tangential line pair test area are mutually independent; adjusting the test target or the camera module to be tested so that the radial line pair test area and the tangential line pair test area correspond to the view finding area of the camera module to be tested; acquiring a raw image of the view finding area; and determining MTF values corresponding to the radial line pair test area and the tangential line pair test area. The accuracy of the test target plate in detecting the camera module is improved, the reject ratio of products can be effectively controlled, and the after-sale maintenance cost of manufacturers is reduced.
Description
Technical Field
The invention relates to the technical field of optical camera shooting, in particular to a detection method of a wide-angle camera module.
Background
Resolution (Resolution), also known as Resolution, discrimination, analysis, Resolution and resolving power, refers to the ability of a camera module to clearly reproduce the details of a scene to be photographed, and is the most important parameter for measuring the image quality of a camera module. Most camera module manufacturers in the industry introduce MTF (optical transfer function) to detect resolution, that is, a camera module to be tested shoots a test target board with a specific spatial frequency (including a plurality of line pair groups, the line pair group is generally composed of horizontal, vertical, black and white lines with uniform line width), and then the resolution is evaluated according to a modulation degree (black and white contrast), wherein the modulation degree is (maximum brightness-minimum brightness)/(maximum brightness + minimum brightness), generally speaking, the larger the modulation degree is, the larger the shooting contrast of the camera module to be tested is, and the better the quality of the camera module to be tested is.
However, the conventional test target adopts the staggered arrangement of the radial line pair group and the tangential line pair group shown in fig. 1, and it is known from the above formula (modulation degree ═ maximum brightness-minimum brightness)/(maximum brightness + minimum brightness)), that the test result value is larger when the difference between the maximum brightness and the minimum brightness is larger, and that when the difference between the radial distortion and the tangential distortion of the camera module is too large, the maximum brightness and the minimum brightness are determined by the direction line pair group with high resolving power, so that the MTF test is performed on the test target using the line pair group arranged in a staggered manner, as long as the camera module has one-direction resolving power, the resolution test result value is high, and thus the test result leads to that when the distortion of the camera module is high in only one direction, the MTF value measured by the lines arranged in a staggered manner in a manner in which the horizontal direction and the vertical direction are still high, and a bad camera module cannot be intercepted, the after-sales maintenance cost of the manufacturer is increased.
Disclosure of Invention
The invention provides a detection method, which is used for solving the problems that the yield is reduced and the after-sale cost of manufacturers is increased due to the fact that the existing MTF test method cannot accurately detect the resolution of a camera module.
An embodiment of the present invention provides a method for detecting a wide-angle camera module, including:
generating a test target corresponding to the camera module to be tested, wherein the test target comprises a radial line pair test area and a tangential line pair test area, and the radial line pair test area and the tangential line pair test area are mutually independent; the method specifically comprises the following steps: acquiring a radial line pair test area and a tangential line pair test area corresponding to the distortion according to the distortion information of the camera module to be tested; generating the test target according to the radial line pair test area and the tangential line pair test area;
adjusting the test target or the camera module to be tested so that the radial line pair test area and the tangential line pair test area correspond to the view finding area of the camera module to be tested;
acquiring a raw image of the view finding area;
determining MTF values corresponding to the radial line pair test area and the tangential line pair test area;
the method comprises the following steps of obtaining a radial line pair test area and a tangential line pair test area corresponding to the distortion according to the distortion information of the camera module to be tested, wherein the steps comprise:
acquiring raw images of a first radial line pair group, wherein line widths of all lines in the first radial line pair group are the same;
acquiring raw images of a first tangential line pair group, wherein the line widths of all lines in the first tangential line pair group are the same;
generating a first grating curve according to the raw image of the first radial line pair group;
generating a second grating curve according to the raw image of the first tangential line pair group;
adjusting the first grating curve and the second grating curve to make the first grating curve and the second grating curve be sinusoidal curves;
adjusting the line width of each line in the first radial line pair group according to the adjusted first grating curve to generate a second radial line pair group;
reducing the line width of each line in the second radial line pair group in equal proportion to generate a third radial line pair group;
adjusting the line width of each line in the first tangential line pair group according to the adjusted second grating curve to generate a second tangential line pair group;
reducing the line width of each line in the second tangential line pair group in equal proportion to generate a third tangential line pair group;
generating a radial line pair test area according to the third radial line pair group;
generating a tangential line pair test area according to the third tangential line pair group;
and in the adjusted first grating curve or the adjusted second grating curve generated by the raw image of the viewing area, the width of the wave crest and the width of the wave trough are 1 to 3 pixel points.
According to the embodiment of the invention, the test target plate corresponding to the camera module to be tested is generated, and the radial line pair group and the tangential line pair group are distributed in the mutually independent test areas, so that the radial line pair group and the tangential line pair group are not influenced mutually, the MTF values of the radial line pair group and the tangential line pair group are respectively obtained, the detection accuracy of the camera module by the test target plate is improved, the reject ratio of products can be effectively controlled, and the after-sale maintenance cost of manufacturers is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art test target using a staggered arrangement of radial line pair groups and tangential line pair groups;
FIG. 2 is a schematic flow chart of a detection method of a wide-angle camera module according to a first embodiment of the present invention;
FIG. 3 is a detailed flow chart of S11 in FIG. 2;
FIG. 4 is a schematic illustration of a test target of the present invention employing mutually independent placement of radial line pair test zones and tangential line pair test zones;
FIG. 5 is a schematic flowchart of a detection method for a wide-angle camera module according to a second embodiment of the present invention;
FIG. 6 is a schematic diagram of obtaining a grating curve from line pair groups, where the left side of the diagram is a line pair group image obtained by the blur camera module and a correspondingly generated grating curve, and the right side of the diagram is a line pair group image obtained by the sharpness camera module and a correspondingly generated grating curve;
FIG. 7 is a schematic structural diagram of a first embodiment of a detection system of the wide-angle camera module according to the present invention;
fig. 8 is a schematic structural diagram of a detection system of a wide-angle camera module according to a second embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention 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 invention and are not intended to limit the invention.
When embodiments of the present invention refer to the ordinal numbers "first", "second", etc., it should be understood that the words are used for distinguishing between them unless the context clearly dictates otherwise.
Step number "S" in the embodiments of the present invention is an abbreviation of "Step", which is an abbreviation of Step. The sequence of steps in the embodiments of the present invention is exemplary and not intended to limit the logical relationship between the steps.
Fig. 2 is a schematic flow chart of a detection method of a wide-angle camera module according to a first embodiment of the present invention. The detection method comprises the following steps of S11-S14:
and S11, generating a test target corresponding to the camera module to be tested, wherein the test target comprises a radial line pair test area and a tangential line pair test area, and the radial line pair test area and the tangential line pair test area are independent from each other.
Because the distortion situation of different wide-angle camera modules is different, need to generate corresponding test target to each wide-angle camera module, or same set of wide-angle camera module to this accuracy that improves follow-up MTF value and acquirees.
The radial line pair test area includes a plurality of radial line pairs, and a plurality of radial line pairs arranged continuously form a radial line pair group, in this embodiment, one radial line pair may include a black line and a white line which are in the same direction and adjacent to each other, the radial line pair group includes a plurality of black lines and white lines which are in the same direction and arranged continuously at intervals, and the sum of the numbers of the black lines and the white lines in the radial line pair group may be an odd number or an even number, which is not limited in the present invention.
In the present embodiment, as shown in fig. 3, S11 further includes S111-S112:
and S111, acquiring a radial line pair test area and a tangential line pair test area corresponding to the distortion according to the distortion information of the camera module to be tested.
In this step, distortion is mainly caused by distortion, and a plurality of groups (usually at least more than 3 groups) of preset test targets are provided, each preset test target may include a plurality of test areas, wherein the same test area includes line pair groups (radial line pair groups or tangential line pair groups) in the same direction, the radial line pair groups or tangential line pair groups located in the same test area have different line widths, a plurality of corresponding shot images are obtained by shooting the plurality of preset test targets, and the test areas and the corresponding images having the same line width in the radial line pair groups or tangential line pair groups in the shot images are selected. Illustratively, the preset image a includes test regions a1, a2, a3... an; b n in the preset image B, test regions B1, B2, b3. are included; the preset image C includes test regions C1, C2, c3... cn; a1, b1 and c1 are located at the same position, a2, b2 and c2 are located at the same position, a3, b3 and c3 are located at the same position, and the like. Assuming that a1, B1 and c1 are radial line pair groups, a2, B2 and c2 are tangential line pair groups, and the line widths of all lines in the radial line pair group corresponding to a1 in the shot image of the preset image a are the same or similar, a1 is selected as the radial line pair test region corresponding to the distortion at the position where the line width of all lines in the tangential line pair group corresponding to a1 in the shot image of the preset image a is the same or similar, and B2 is selected as the tangential line pair test region corresponding to the distortion at the position where the line width of all lines in the tangential line pair group corresponding to B2 in the shot image B is the same or similar. And acquiring radial line pair test areas and tangential line pair test areas corresponding to the distortion and position information corresponding to the test areas from the groups of preset test targets according to the method.
As can be inferred from the above description, the preset image A, B may be entirely a radial line pair group or a tangential line pair group, and when the radial line pair group or the tangential line pair group is entirely used, the preset image A, B may be equally divided into a plurality of test regions.
And S112, generating the test target according to the radial line pair test area and the tangential line pair test area.
The radial line pair test area and the tangential line pair test area obtained in step S111 may be arranged at corresponding positions on the test target, and it should be noted that, as shown in fig. 4, there may be a plurality of radial line pair test areas and tangential line pair test areas on one test target, which is not limited in the present invention.
And S12, adjusting the test target or the camera module to be tested so that the radial line pair test area and the tangential line pair test area correspond to the view finding area of the camera module to be tested.
In the step, the relative position of the test target or the camera module to be tested is mainly adjusted, so that the camera module to be tested is over against the test target, and a plurality of preset test windows in the view area of the camera module to be tested correspond to the radial line pair test area and the tangential line pair test area. In this embodiment, the preset test window may be visible through the demarcated area, or may be invisible through other positioning means.
And S13, acquiring raw images of the view finding area.
In the step, a Raw image of the view area can be obtained by shooting the test target, wherein the Raw image comprises all photo information of the image of the test target after the sensor is generated and before the image enters the camera image processor, and the Raw image is an original image without any compensation and calibration.
And S14, determining MTF values corresponding to the radial line pair test area and the tangential line pair test area.
The MTF values corresponding to the radial line pair testing area and the tangential line pair testing area are respectively obtained in the step, so that the method can be used for analyzing the imaging quality of the wide-angle camera module or judging the quality of the good products and the defective products.
According to the embodiment of the invention, the test target plate corresponding to the camera module to be tested is generated, and the radial line pair group and the tangential line pair group are distributed in the mutually independent test areas, so that the radial line pair group and the tangential line pair group are not influenced mutually, the MTF values of the radial line pair group and the tangential line pair group are respectively obtained, the detection accuracy of the camera module by the test target plate is improved, the reject ratio of products can be effectively controlled, and the after-sale maintenance cost of manufacturers is reduced.
When testing the wide-angle camera module, because the peripheral picture of wide-angle camera module can take place the condition of serious distortion (like distortion and resolution power decay), lead to camera module radial and tangential resolution power to take place obvious difference, simultaneously, because distortion makes the radial and tangential spatial frequency of the line pair group in the test target board of shooting different, the line probably because distortion extrusion is in the same place to the black and white line in the line pair group, and then makes ordinary MTF test method can't normally detect the resolution ratio of wide-angle camera module.
To solve the above technical problem, a second embodiment of the method for detecting a wide-angle camera module of the present invention is provided, and fig. 5 is a schematic flow chart of the second embodiment of the method for detecting a wide-angle camera module of the present invention. The detection method comprises S201-S213:
s201, obtaining raw images of a first radial line pair group, wherein line widths of all lines in the first radial line pair group are the same.
S202, obtaining raw images of a first tangential line pair group, wherein line widths of all lines in the first tangential line pair group are the same.
In this embodiment, the first radial line pair group and the first tangential line pair group each include black and white lines with the same line width and arranged at intervals.
And S203, generating a first grating curve according to the raw image of the first radial line pair group.
And S204, generating a second grating curve according to the raw image of the first tangential line pair group.
In the raw image, a curve with periodically changing brightness as shown in fig. 6 is generated according to the difference of line brightness in the image, and is determined as a first raster curve or a second raster curve. It should be noted that, in the embodiment of the present invention, the actual first grating curve and the actual second grating curve are generated by a plurality of sets of radial line pairs and tangential line pairs, and may be generated according to all continuous line pair sets, and since the wide-angle camera module may generate distortion such as distortion, the shapes of the first grating curve and the second grating curve are irregular, and specifically, the widths of the peaks and the widths of the valleys of the first grating curve and the second grating curve may change in the extending direction.
S205, adjusting the first grating curve and the second grating curve to make the first grating curve and the second grating curve be sinusoidal curves.
And S206, adjusting the line width of each line in the first radial line pair group according to the adjusted first grating curve to generate a second radial line pair group.
And S207, adjusting the line width of each line in the first tangential line pair group according to the adjusted second grating curve, and generating a second tangential line pair group.
The first grating curve and the second grating curve are relatively regular sinusoidal curves by adjusting the first grating curve and the second grating curve, and the line widths of the first radial line pair group and the first tangential line pair group are correspondingly adjusted at the moment, so that the adjusted second radial line pair group and the second tangential line pair group generate the corresponding grating curves which are relatively regular sinusoidal curves after the raw image is acquired by the wide-angle camera module.
And S208, generating a radial line pair test area according to the second radial line pair group.
S209, generating the tangential line pair test area according to the second tangential line pair group.
In this embodiment, the radial line pair test area and the tangential line pair test area are respectively a test area, or may be respectively a plurality of test areas, the radial line pair test area may include all or part of the second radial line pair group, and similarly, the tangential line pair test area may include all or part of the second tangential line pair group.
S210, generating the test target according to the radial line pair test area and the tangential line pair test area.
S211, adjusting the test target or the camera module to be tested so that the radial line pair test area and the tangential line pair test area correspond to the view finding area of the camera module to be tested.
S212, acquiring a raw image of the view area.
Through the adjustment of the S201-S210, the spatial frequency of the radial line pair group and the tangential line pair group in the raw image of the viewing area is the same, and the distortion influence of the wide-angle camera module is counteracted.
S213, determining the corresponding MTF values of the radial line pair test area and the tangential line pair test area.
S210-S213 are the same as the corresponding steps of the first embodiment and are not described again here.
According to the embodiment of the invention, the first grating curve and the second grating curve are generated in advance according to the regular first radial line pair group and the regular first tangential line pair group, and the second radial line pair group and the second tangential line pair group corresponding to the distortion condition of the wide-angle camera module are reversely obtained by adjusting the first grating curve and the second grating curve to be sinusoidal curves, so that the reliability of obtaining the radial line pair test area and the tangential line pair test area can be ensured, the interference of the wide-angle camera module distortion on the test result is eliminated, and the accuracy of the wide-angle camera module detection is improved.
Referring to fig. 6, the left side of the diagram shows the line pair group image obtained by the blur camera module and the corresponding generated raster curve, and the right side of the diagram shows the line pair group image obtained by the sharpness camera module and the corresponding generated raster curve. When the black and white lines in the line pair group are very wide (namely, the spatial frequency is very low), the wave width of a formed raster curve (a curve generated according to the change of the black and white brightness period, namely, a thick line in the graph is similar to a sinusoidal curve) graph is very wide, at this time, the maximum brightness value (namely, the wave peak value) of the imaging of the clear camera module and the imaging of the fuzzy camera module are basically the same, and the minimum brightness value (namely, the wave valley value) of the imaging of the clear camera module and the imaging of the fuzzy camera module are also basically the same. Further, it is inferred from a modulation degree formula (modulation degree ═ maximum luminance-minimum luminance)/(maximum luminance + minimum luminance)), that MTF values are large in both the sharpness module and the blur module, which affects the reliability of the wide-angle camera module test result.
In order to solve the above technical problem, a third embodiment of the detection method of the wide-angle camera module according to the present invention is provided. The difference from the second embodiment described above is:
after the step of adjusting the line width of each line in the first radial line pair group according to the adjusted first grating curve and generating the second radial line pair group, the method further includes:
and reducing the line width of each line in the second radial line pair group in equal proportion to generate a third radial line pair group.
The step of generating the radial line pair test area according to the second radial line pair group specifically includes: and generating a radial line pair test area according to the third radial line pair group.
After the step of adjusting the line width of each line in the first tangential line pair group according to the adjusted second grating curve to generate a second tangential line pair group, the method further includes:
and reducing the line width of each line in the second tangential line pair group in equal proportion to generate a third tangential line pair group.
The step of generating the tangential line pair test area according to the second tangential line pair group specifically includes: and generating the tangential line pair test area according to the third tangential line pair group.
In this embodiment, the line widths of the lines in the second radial line pair group and the second tangential line pair group are reduced in equal proportion, so that when the raw image of the viewing area is obtained, in the final grating curve generated by the raw image of the viewing area, the peak width and the trough width are 1 to 3 pixels under the condition that the amplitude of the grating curve is maximum.
When the line pair group with smaller line width is used for testing, the wave width in the grating curve is narrowed (the widths of the wave crest and the wave trough are both reduced), although the wave width of the grating curve of the left fuzzy module is consistent with that of the right side in the figure 6, the maximum brightness (wave peak value) is much lower than that of the right side, and meanwhile, the minimum brightness (wave trough value) is much higher than that of the right side, so that the MTF value of the left fuzzy module is smaller than that of the right clear module, and the testing accuracy and reliability are guaranteed.
It should be noted that, in this embodiment, the distance between adjacent peaks and troughs is preferably 1 pixel point. When the wave crest and the wave trough of the final grating curve are only one pixel point, the wave width reaches the narrowest value, and the test result is most accurate and reliable.
The above description describes in detail embodiments of the detection method for a wide-angle camera module according to the present invention. The system corresponding to the above-described method (i.e., the detection system) will be further described below. Wherein, the detection system can be integrated or separated.
Fig. 7 is a schematic structural diagram of a detection method of a wide-angle camera module according to a first embodiment of the present invention, for implementing the detection method in the first embodiment of the above method. The detection system 100 includes a generation module 110, an adjustment module 120, an acquisition module 130, and a determination module 140.
The generating module 110 is connected to the adjusting module 120, and is configured to generate a test target corresponding to the camera module to be tested, where the test target includes a radial line pair test area and a tangential line pair test area, and the radial line pair test area and the tangential line pair test area are independent of each other.
In this embodiment, the generating module 110 includes an acquiring unit 111 and a generating unit 112: wherein the content of the first and second substances,
and the obtaining unit 111 is connected with the generating unit 112 and is used for obtaining a radial line pair test area and a tangential line pair test area corresponding to the distortion according to the distortion information of the camera module to be tested.
A generating unit 112, configured to generate the test target according to the radial line pair test area and the tangential line pair test area.
The adjusting module 120 is connected to the obtaining module 130, and is configured to adjust the test target or the to-be-tested camera module, so that the radial line pair test area and the tangential line pair test area correspond to a viewing area of the to-be-tested camera module.
And the acquisition module 130 is connected to the determination module 140 and configured to acquire a raw image of the viewing area.
A determining module 140, configured to determine MTF values corresponding to the radial line pair test area and the tangential line pair test area.
In this embodiment, each module and unit corresponds to a step of the first embodiment of the method one to one, and the implementation functions are the same, which is not described herein again.
According to the embodiment of the invention, the test target plate corresponding to the camera module to be tested is generated, and the radial line pair group and the tangential line pair group are distributed in the mutually independent test areas, so that the radial line pair group and the tangential line pair group are not influenced mutually, the MTF values of the radial line pair group and the tangential line pair group are respectively obtained, the detection accuracy of the camera module by the test target plate is improved, the reject ratio of products can be effectively controlled, and the after-sale maintenance cost of manufacturers is reduced.
Please refer to fig. 8, which is a schematic structural diagram of a detection system of a wide-angle camera module according to a second embodiment of the present invention. The detection method in the second embodiment for implementing the above method. The detection system 200 includes a generation module 210, an adjustment module 220, an acquisition module 230, and a determination module 240.
In this embodiment, the generating module 210 includes an acquiring unit 211 and a generating unit 212: wherein the content of the first and second substances,
the acquisition unit 211 includes a first acquisition sub-unit 2111, a second acquisition sub-unit 2112, a first generation sub-unit 2113, a second generation sub-unit 2114, an adjustment sub-unit 2115, a third generation sub-unit 2116, a fourth generation sub-unit 2117, a fifth generation sub-unit 2118, and a sixth generation sub-unit 21190. Wherein the content of the first and second substances,
the first obtaining subunit 2111 is connected to the first generating subunit 2113, and is configured to obtain a raw image of a first radial line pair group, where line widths of lines in the first radial line pair group are the same.
The first generating subunit 2113 is connected to the adjusting subunit 2115, and is configured to generate a first grating curve according to the raw image of the first radial line pair group.
The second obtaining subunit 2112 is connected to the second generating subunit 2114, and is configured to obtain a raw image of a first tangential line pair group, where line widths of lines in the first tangential line pair group are the same.
And a second generating subunit 2114, connected to the adjusting subunit 2115, configured to generate a second grating curve according to the raw image of the first tangential line pair group.
And an adjusting subunit 2115, connected to the third generating subunit 2116 and the fourth generating subunit 2117, configured to adjust the first grating curve and the second grating curve, so that the first grating curve and the second grating curve are sinusoidal curves.
And a third generating subunit 2116, connected to the fifth generating subunit 2118, configured to adjust line widths of lines in the first radial line pair group according to the adjusted first grating curve, and generate a second radial line pair group.
And a fourth generating subunit 2117, connected to the sixth generating subunit 2119, configured to adjust the line width of each line in the first tangential line pair group according to the adjusted second grating curve, and generate a second tangential line pair group.
A fifth generating subunit 2118, configured to generate the radial line pair test area according to the second radial line pair group.
A sixth generating subunit 2119, configured to generate the tangential line pair test area according to the second tangential line pair group.
The generating unit 212 generates the test target according to the radial line pair test area and the tangential line pair test area.
An adjusting module 220, connected to the obtaining module 230, configured to adjust the test target or the to-be-tested camera module, so that the radial line pair test area and the tangential line pair test area correspond to a viewing area of the to-be-tested camera module.
And an acquiring module 230, connected to the determining module 240, configured to acquire a raw image of the viewing area.
A determining module 240, configured to determine MTF values corresponding to the radial line pair test area and the tangential line pair test area.
Each module, unit and subunit in this embodiment correspond to the steps in the second embodiment of the method one to one, and implement the same functions, which are not described herein again.
According to the embodiment of the invention, the first grating curve and the second grating curve are generated in advance according to the regular first radial line pair group and the regular first tangential line pair group, and the second radial line pair group and the second tangential line pair group corresponding to the distortion condition of the wide-angle camera module are reversely obtained by adjusting the first grating curve and the second grating curve to be sinusoidal curves, so that the reliability of obtaining the radial line pair test area and the tangential line pair test area can be ensured, the interference of the wide-angle camera module distortion on the test result is eliminated, and the accuracy of the wide-angle camera module detection is improved.
As a third embodiment of the detection system of the wide-angle camera module of the present invention, the difference from the second embodiment of the above system is:
the system further comprises:
and the seventh generating subunit is connected with the fifth generating subunit and is used for reducing the line width of each line in the second radial line pair group in an equal proportion to generate a third radial line pair group.
And the eighth generating subunit is connected with the sixth generating subunit and is used for reducing the line width of each line in the second tangential line pair group in an equal proportion to generate a third tangential line pair group.
A fifth generation subunit: and specifically, generating the radial line pair test area according to the third radial line pair group.
A sixth generation subunit: and specifically, generating the tangential line pair test area according to the third tangential line pair group.
In this embodiment, the line widths of the lines in the second radial line pair group and the second tangential line pair group are reduced in equal proportion, so that when the raw image of the view finding region is obtained, in a final grating curve generated by the raw image of the view finding region, under the condition that the amplitude of the grating curve is maximum, the peak width and the trough width are 1 to 3 pixel points.
When the line pair group with smaller line width is used for testing, the wave width in the grating curve is narrowed (the widths of the wave crest and the wave trough are both reduced), although the wave width of the grating curve of the left fuzzy module is consistent with that of the right side, the maximum brightness (wave peak value) is much lower than that of the right side, and meanwhile, the minimum brightness (wave trough value) is much higher than that of the right side, so that the MTF value of the left fuzzy module is smaller than that of the right clear module, and the testing accuracy and reliability are guaranteed.
It will be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
In the several embodiments provided in the present application, it should be understood that the disclosed detection system and detection method may be implemented in other ways. For example, the above-described embodiments of the detection system are merely illustrative, and the division of the modules or units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. A detection method of a wide-angle camera module is characterized by comprising the following steps:
generating a test target corresponding to the camera module to be tested, wherein the test target comprises a radial line pair test area and a tangential line pair test area, and the radial line pair test area and the tangential line pair test area are mutually independent; the method specifically comprises the following steps: acquiring a radial line pair test area and a tangential line pair test area corresponding to the distortion according to the distortion information of the camera module to be tested; generating the test target according to the radial line pair test area and the tangential line pair test area;
adjusting the test target or the camera module to be tested so that the radial line pair test area and the tangential line pair test area correspond to the view finding area of the camera module to be tested;
acquiring a raw image of the view finding area;
determining MTF values corresponding to the radial line pair test area and the tangential line pair test area;
the method comprises the following steps of obtaining a radial line pair test area and a tangential line pair test area corresponding to the distortion according to the distortion information of the camera module to be tested, wherein the steps comprise:
acquiring raw images of a first radial line pair group, wherein line widths of all lines in the first radial line pair group are the same;
acquiring raw images of a first tangential line pair group, wherein the line widths of all lines in the first tangential line pair group are the same;
generating a first grating curve according to the raw image of the first radial line pair group;
generating a second grating curve according to the raw image of the first tangential line pair group;
adjusting the first grating curve and the second grating curve to make the first grating curve and the second grating curve be sinusoidal curves;
adjusting the line width of each line in the first radial line pair group according to the adjusted first grating curve to generate a second radial line pair group;
reducing the line width of each line in the second radial line pair group in equal proportion to generate a third radial line pair group;
adjusting the line width of each line in the first tangential line pair group according to the adjusted second grating curve to generate a second tangential line pair group;
reducing the line width of each line in the second tangential line pair group in equal proportion to generate a third tangential line pair group;
generating a radial line pair test area according to the third radial line pair group;
generating a tangential line pair test area according to the third tangential line pair group;
and in the adjusted first grating curve or the adjusted second grating curve generated by the raw image of the viewing area, the width of the wave crest and the width of the wave trough are 1 to 3 pixel points.
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| CN201910870045.7A CN110579935B (en) | 2017-08-08 | 2017-08-08 | Method and system for generating test target corresponding to camera module to be tested |
| CN201910870050.8A CN110618580B (en) | 2017-08-08 | 2017-08-08 | Detection method and system |
| CN201910870049.5A CN110519590B (en) | 2017-08-08 | 2017-08-08 | Detection method and system of camera module |
| CN201911274640.0A CN111045287B (en) | 2017-08-08 | 2017-08-08 | Detection system of wide-angle camera module |
| CN201710669852.3A CN107561850B (en) | 2017-08-08 | 2017-08-08 | Detection method of wide-angle camera module |
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| CN201710669852.3A CN107561850B (en) | 2017-08-08 | 2017-08-08 | Detection method of wide-angle camera module |
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| CN201910870045.7A Division CN110579935B (en) | 2017-08-08 | 2017-08-08 | Method and system for generating test target corresponding to camera module to be tested |
| CN201910870049.5A Division CN110519590B (en) | 2017-08-08 | 2017-08-08 | Detection method and system of camera module |
| CN201911274640.0A Division CN111045287B (en) | 2017-08-08 | 2017-08-08 | Detection system of wide-angle camera module |
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| CN201710669852.3A Active CN107561850B (en) | 2017-08-08 | 2017-08-08 | Detection method of wide-angle camera module |
| CN201910870045.7A Active CN110579935B (en) | 2017-08-08 | 2017-08-08 | Method and system for generating test target corresponding to camera module to be tested |
| CN201910870050.8A Active CN110618580B (en) | 2017-08-08 | 2017-08-08 | Detection method and system |
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| Publication number | Publication date |
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| CN110519590B (en) | 2020-11-06 |
| CN107561850A (en) | 2018-01-09 |
| CN110618580A (en) | 2019-12-27 |
| CN111045287B (en) | 2021-08-24 |
| CN111045287A (en) | 2020-04-21 |
| CN110579935A (en) | 2019-12-17 |
| CN110519590A (en) | 2019-11-29 |
| CN110618580B (en) | 2021-08-24 |
| CN110579935B (en) | 2021-08-24 |
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