CN105163009A - Picture and method for testing camera module - Google Patents
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- CN105163009A CN105163009A CN201510471522.4A CN201510471522A CN105163009A CN 105163009 A CN105163009 A CN 105163009A CN 201510471522 A CN201510471522 A CN 201510471522A CN 105163009 A CN105163009 A CN 105163009A
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Abstract
The invention provides a picture and method for testing a camera module. The camera module is used for shooting the picture, so that an image is obtained. The picture is square in shape and includes a plurality of crosses distributed in the middle part of the picture at intervals. Each cross is composed of a first rectangle and a second rectangle perpendicular to each other. The angles between each of the first rectangles and the second rectangles and the edges of the picture are 45 degree. The first rectangles and the second rectangles are both white and black squares are arranged at the intersections of the first rectangles and the second rectangles. The angle between the black squares and the first rectangles as well as the second rectangles is 7 to 15 degree. Each cross is surrounded by a black area. The angles between a focusing square of the camera module and the edges of the picture are 45 degree. The focusing square captures the black squares, so that the white parts of the crosses and the black parts of the black squares can exist in the focusing square at the same time. The black-white contrast ratio is calculated. The higher the black-white contrast ratio is, the higher the definition of the image is suggested. According to the invention, accurate center focusing can be achieved and testing accuracy is improved.
Description
Technical field
The present invention relates to test camera module technical field, particularly relating to a kind of picture for testing camera module and the method for testing camera module.
Background technology
Test has optical anti-vibration device (OpticalImageStabilization, OIS) camera module (CompactCameraModule, CCM) time, generally carry out in light box, a test chart figure is attached to light box sidewall, the camera module with OIS is placed in the vibration machine on the desktop bottom light box, requires that desktop and chart scheme to keep vertical, and the optical axis of camera module is positioned at horizontal direction and perpendicular to chart figure surface.
The image acquisition device of CCM takes chart figure under specific light bright ring border, the image data collected is transferred to testing software, the image information that testing software analysis collects, and by special algorithm process, judges the esolving degree quality of CCM.Due in the diverse location of CCM filmed image, esolving degree is different, so usually need Selection Center region to judge overall picture quality during test.
Be conventionally used to the chart figure of test camera module as shown in Figure 1, four corners tested in chart Figure 100 are four square black blockages 110 (identification color of black blockage is Shadow marks), centre is cross white portion 120.After utilizing camera module to take above-mentioned traditional chart image, a sampling square frame 130 is chosen by testing software, it is the figure of Hei-Bai-Hei in sampling square frame 130, according to the figure of Hei-Bai-Hei, the mtf value (ModulationTransferFunction, modular transfer value) of the pixel in sampling square frame can be calculated.Above-mentioned traditional chart figure is used to the mtf value of test pattern, and mtf value can pass through the sharpness (Sharpness) that SFR (spatialfrequencyresponse) algorithm weighs image.SFR numerical value is larger, and representative image is sharper keen, and now picture is also more clear.
But the chart figure in Fig. 1, center of can not precisely focusing in test process, cannot precisely focus, and therefore calculates according to the photo of shooting the stabilization ability recorded and easily occurs deviation.
Summary of the invention
Based on this, be necessary for above-mentioned technical problem, provide a kind of can precisely focus to improve the accuracy of test for testing the picture of camera module and the method for testing camera module.
A kind of picture for testing camera module, described picture is square, it comprises the cross at multiple middle part in described picture spaced apart, described cross is intersected vertically by the first rectangle and the second rectangle and is formed, the limit angulation of described first rectangle and described second rectangle and described picture is 45 °, described first rectangle and described second rectangle are white, described first rectangle and the described second rectangular place of intersecting vertically are provided with black bars, described black bars and described first rectangle and described second rectangle angulation are 7 ~ 15 °, each cross by black region around.
Wherein in an embodiment, the number of described cross is four, and four described crosses are distributed on the symmetry axis of described picture side by side.
For testing a method for camera module, comprise the following steps:
Camera module is utilized to take the picture for testing camera module, optical axis direction and the described picture of described camera module are perpendicular, wherein said picture is square, the focusing square of described camera module and the limit angulation of described picture are 45 °, described picture comprises the cross at multiple middle part in described picture spaced apart, described cross is intersected vertically by the first rectangle and the second rectangle and is formed, the limit angulation of described first rectangle and described second rectangle and described picture is 45 °, described first rectangle and described second rectangle are white, described first rectangle and the described second rectangular place of intersecting vertically are provided with black bars, described black bars and described first rectangle and described second rectangle angulation are 7 ~ 15 °, each cross by black region around,
Described focusing square captures described black bars, makes to there is the white portion of described cross and the black part of described black bars in focusing square simultaneously;
Calculate the black white contrast in described focusing square, black white contrast is larger, and presentation video is more clear.
Wherein in an embodiment, before utilizing camera module to take picture, also comprise step:
The picture being used for testing camera module is placed in the sidepiece of light box;
Camera module to be placed in light box and to make described picture mutually vertical with the optical axis direction of described camera module.
Wherein in an embodiment, when utilizing described camera module to take picture, take in following three kinds of situations respectively:
The anti-hand shake device of camera module is not opened and camera module is not shaken when, obtain the first image, determine the first rectangular width D in the first image
x1and the second rectangular width D
y1;
The anti-hand shake device of camera module do not open and camera module shake when, obtain the second image, determine the first rectangular width D in the second image
x2and the second rectangular width D
y2;
The anti-hand shake device of camera module open and camera module shake when, obtain the 3rd image, determine the first rectangular width D in the 3rd image
x3and the second rectangular width D
y3;
According to following formulae discovery stabilization ability:
Stabilization ability D on first rectangle Width
x_ dB=20Log
10(D
x3-D
x1)/(D
x2-D
x1);
Stabilization ability D on second rectangle Width
y_ Db=20Log
10(D
y3-D
y1)/(D
y2– D
y1).
Wherein in an embodiment, the first rectangular width D
xcalculate according to the number of pixels of the white portion on the first rectangle Width and determine, the second rectangular width D
ycalculate according to the number of pixels of the white portion on the second rectangle Width and determine, wherein R, G, B value is all greater than the pixel for white portion of 200, and R, G, B value is all less than the pixel for black region of 200.
Wherein in an embodiment, the computing formula of compression ratio is:
Compression ratio on first rectangle Width:
D
x_％＝100-((D
x3-D
x1)/((D
x2-D
x1)))*100；
Compression ratio on second rectangle Width:
D
y_％＝100-((D
y3-D
y1)/((D
y2–D
y1)))*100。
Wherein in an embodiment, the first image, the second image and the 3rd image are square.
Wherein in an embodiment, the number of described cross is four, and four described crosses are distributed on the symmetry axis of described picture side by side.
Above-mentioned picture and method for testing camera module at least has the following advantages:
During test, utilize camera module to carry out shooting to picture and obtain image, picture is square, comprise the cross at multiple middle part in picture spaced apart, cross is intersected vertically by the first rectangle and the second rectangle and is formed, the limit angulation of the first rectangle and the second rectangle and picture is 45 °, first rectangle and the second rectangle are white, first rectangle and the second rectangular place of intersecting vertically are provided with black bars, black bars and the first rectangle and the second rectangle angulation are 7 ~ 15 °, each cross by black region around, the focusing square of camera module and the limit angulation of picture are also 45 °, when focusing, focusing square grabs black bars, make in focusing square, to there is the white portion of cross and the black part of black bars simultaneously, calculate the black white contrast in focusing square, black white contrast is larger, presentation video is more clear.Therefore, center of can precisely focusing in the present invention, improves the accuracy of test.
Accompanying drawing explanation
Fig. 1 be conventionally used to test camera module chart figure choose design sketch;
Fig. 2 is the schematic diagram of the picture for testing camera module in an execution mode;
Fig. 3 is the schematic flow sheet of the method for testing camera module in an execution mode;
Fig. 4 is the schematic diagram of the first image;
Fig. 5 is the schematic diagram of the second image;
Fig. 6 is the schematic diagram of the 3rd image.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can be much different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar improvement when intension of the present invention, therefore the present invention is by the restriction of following public concrete enforcement.
It should be noted that, when element is called as " being fixed on " another element, directly can there is element placed in the middle in it on another element or also.When an element is considered to " connection " another element, it can be directly connected to another element or may there is centering elements simultaneously.Term as used herein " vertical ", " level ", "left", "right" and similar statement just for illustrative purposes, do not represent it is unique execution mode.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
Referring to Fig. 2, is for testing the picture 200 of camera module in an execution mode.This picture 200 being used for testing camera module is roughly square.Specific in present embodiment, picture 200 is rectangle.Certainly, in other embodiments, picture 200 also can be square.
Particularly, picture 200 comprises the cross 210 at multiple middle part in picture 200 spaced apart, can carry out multiple test with the camera module of OIS device simultaneously.Cross 210 is intersected vertically by the first rectangle 211 and the second rectangle 212 and is formed.Specific in present embodiment, cross 210, four crosses 210 that picture 200 comprises four middle parts in picture 200 spaced apart are distributed on the symmetry axis 200a of picture 200 side by side.The center of cross 210 is on the symmetry axis 200a of picture 200.Certainly, in other embodiments, can also arrange the cross 210 of, two three, five or greater number, all crosses 210 are all arranged on the symmetry axis 200a of picture 200.
First rectangle 211 is 45 ° with the limit angulation α of picture 200.Second rectangle 212 is 45 ° with the limit angulation β of picture 200.Namely whole cross 210 is 45 ° with the limit angulation of picture 200.First rectangle 211 and the second rectangle 212 are white, the place of intersecting vertically of the first rectangle 211 and the second rectangle 212 is provided with black bars 220, and black bars 220 and the first rectangle 211 and the second rectangle 212 angulation γ are 7 ° ~ 15 °.Each cross 210 by black region around.In present embodiment, the first rectangle 211 and center identical with the second rectangle 212 overlaps.
The above-mentioned picture 200 for testing camera module at least has the following advantages:
During test, utilize camera module to carry out shooting to picture 200 and obtain image, picture 200 is square, comprise the cross 210 at multiple middle part in picture 200 spaced apart, cross 210 is intersected vertically by the first rectangle 211 and the second rectangle 212 and is formed, first rectangle 211 and the second rectangle 212 are 45 ° with the limit angulation of picture 200, first rectangle 211 and the second rectangle 212 are white, the place of intersecting vertically of the first rectangle 211 and the second rectangle 212 is provided with black bars 220, black bars 220 and the first rectangle 211 and the second rectangle 212 angulation are 7 ~ 15 °, each cross 210 by black region around, the focusing square 300 of camera module is also 45 ° with the limit angulation of picture 200, when focusing, focusing square 300 grabs black bars 220, make in focusing square 300, to there is the white portion of cross 210 and the black part of black bars 220 simultaneously, calculate the black white contrast in focusing square 300, black white contrast is larger, presentation video is more clear.Therefore, center of can precisely focusing in the present invention, improves the accuracy of test.
Meanwhile, refer to Fig. 3, the present invention also provides a kind of method for testing camera module, specifically comprises the following steps:
Step S110, utilizes camera module to take the picture 200 for testing camera module.Specific in present embodiment, picture 200 is roughly square.Specific in present embodiment, picture 200 is rectangle.Certainly, in other embodiments, picture 200 also can be square.
Particularly, picture 200 comprises the cross 210 at multiple middle part in picture 200 spaced apart, can carry out multiple test with the camera module of OIS device simultaneously.Cross 210 is intersected vertically by the first rectangle 211 and the second rectangle 212 and is formed.Specific in present embodiment, cross 210, four crosses 210 that picture 200 comprises four middle parts in picture 200 spaced apart are distributed on the symmetry axis 200a of picture 200 side by side.The center of cross 210 is on the symmetry axis 200a of picture 200.Certainly, in other embodiments, can also arrange the cross 210 of, two three, five or greater number, all crosses 210 are all arranged on the symmetry axis 200a of picture 200.
First rectangle 211 and the second rectangle 212 are 45 ° with the limit angulation of picture 200.Namely whole cross 210 is 45 ° with the limit angulation of picture 200.First rectangle 211 and the second rectangle 212 are white, the place of intersecting vertically of the first rectangle 211 and the second rectangle 212 is provided with black bars 220, and black bars 220 and the first rectangle 211 and the second rectangle 212 angulation are 7 ° ~ 15 °.Each cross 210 by black region around.
Because whole cross 210 and picture 200 angulation are 45 °, and the optical axis direction of camera module is perpendicular with picture 200, and therefore, the focusing square 300 of camera module and the limit angulation of picture 200 are also 45 °.
Certainly, specific in present embodiment, utilizing before camera module takes picture 200, can step comprised:
The picture 200 being used for testing camera module is placed in the sidepiece of light box.Such as, picture 200 is attached on the sidewall of light box.The sidewalls orthogonal of light box is in ground.
Camera module to be placed in light box and to make picture 200 mutually vertical with the optical axis direction of camera module.Ensure that picture 200 is mutually vertical with the optical axis direction of camera module, be conducive to shooting more clear comprehensive image, be conducive to the accuracy improving assessment.Particularly, the optical axis direction of camera module can be arranged to picture 200 perpendicular by vibration machine.Vibration machine is arranged on desktop, and the sidepiece of desktop and light box is perpendicular.Vibration machine can for being similar to vertical support.
Step S120, focusing square 300 captures black bars 220, makes to there is the white portion of cross 210 and the black part of black bars 220 in focusing square 300 simultaneously.Due to the existence of black bars 220, just make can realize there is white portion and black part in focusing square 300 simultaneously, thus realize focusing at the middle part of picture 200 this purpose.
Step S130, calculate the black white contrast in focusing square 300, black white contrast is larger, and presentation video is more clear, thus to focus at picture 200 to position clearly, obtains image more clearly.
The above-mentioned method for testing camera module at least has the following advantages:
During test, utilize camera module to carry out shooting to picture 200 and obtain image, picture 200 is square, comprise the cross 210 at multiple middle part in picture 200 spaced apart, cross 210 is intersected vertically by the first rectangle 211 and the second rectangle 212 and is formed, first rectangle 211 and the second rectangle 212 are 45 ° with the limit angulation of picture 200, first rectangle 211 and the second rectangle 212 are white, the place of intersecting vertically of the first rectangle 211 and the second rectangle 212 is provided with black bars 220, black bars 220 and the first rectangle 211 and the second rectangle 212 angulation are 7 ~ 15 °, each cross 210 by black region around, the focusing square 300 of camera module is also 45 ° with the limit angulation of picture 200, when focusing, focusing square 300 grabs black bars 220, make in focusing square 300, to there is the white portion of cross 210 and the black part of black bars 220 simultaneously, calculate the black white contrast in focusing square 300, black white contrast is larger, presentation video is more clear.Therefore, center of can precisely focusing in the present invention, improves the accuracy of test.
Certainly, adopt above-mentioned method of testing to can also be used to test the anti-shudder performance of camera module, concrete steps are as follows: when utilizing camera module to take picture 200, take respectively in following three kinds of situations:
The first situation: the anti-hand shake device of camera module is not opened and camera module is not shaken when, obtain the first image (as shown in Figure 4), determine the width D of the first rectangle 211 in the first image
x1and second width D of rectangle 212
y1.
The second situation: the anti-hand shake device of camera module do not open and camera module shake when, obtain the second image (as shown in Figure 5), determine the width D of the first rectangle 211 in the second image
x2and second width D of rectangle 212
y2.
In the third situation: the anti-hand shake device of camera module open and camera module shake when, obtain the 3rd image (as shown in Figure 6), determine the width D of the first rectangle 211 in the 3rd image
x3and second width D of rectangle 212
y3.First image, the second image and the 3rd image are square.
According to following formulae discovery stabilization ability:
Stabilization ability D on first rectangle 211 Width
x_ dB=20Log
10(D
x3-D
x1)/(D
x2-D
x1);
Stabilization ability D on second rectangle 212 Width
y_ Db=20Log
10(D
y3-D
y1)/(D
y2– D
y1).
Specific in present embodiment, the width D of the first rectangle 211
xcalculate according to the number of pixels of the white portion on the first rectangle 211 Width and determine, the width D of the second rectangle 212
ycalculate according to the number of pixels of the white portion on the second rectangle 212 Width and determine, wherein R, G, B value is all greater than the pixel for white portion of 200, and R, G, B value is all less than the pixel for black region of 200.
Can also be checked the stabilization ability of camera module by compression ratio, the computing formula of compression ratio is:
Compression ratio on first rectangle 211 Width:
D
x_％＝100-((D
x3-D
x1)/((D
x2-D
x1)))*100；
Compression ratio on second rectangle 212 Width:
D
y_ %=100-((D
y3-D
y1)/((D
y2– D
y1))) * 100, compression ratio is less, represents that stabilization ability is better.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. one kind for testing the picture of camera module, it is characterized in that, described picture is square, it comprises the cross at multiple middle part in described picture spaced apart, described cross is intersected vertically by the first rectangle and the second rectangle and is formed, the limit angulation of described first rectangle and described second rectangle and described picture is 45 °, described first rectangle and described second rectangle are white, described first rectangle and the described second rectangular place of intersecting vertically are provided with black bars, described black bars and described first rectangle and described second rectangle angulation are 7 ~ 15 °, each cross by black region around.
2. the picture for testing camera module according to claim 1, is characterized in that, the number of described cross is four, and four described crosses are distributed on the symmetry axis of described picture side by side.
3. for testing a method for camera module, it is characterized in that, comprising the following steps:
Camera module is utilized to take the picture for testing camera module, optical axis direction and the described picture of described camera module are perpendicular, wherein said picture is square, the focusing square of described camera module and the limit angulation of described picture are 45 °, described picture comprises the cross at multiple middle part in described picture spaced apart, described cross is intersected vertically by the first rectangle and the second rectangle and is formed, the limit angulation of described first rectangle and described second rectangle and described picture is 45 °, described first rectangle and described second rectangle are white, described first rectangle and the described second rectangular place of intersecting vertically are provided with black bars, described black bars and described first rectangle and described second rectangle angulation are 7 ~ 15 °, each cross by black region around,
Described focusing square captures described black bars, makes to there is the white portion of described cross and the black part of described black bars in focusing square simultaneously;
Calculate the black white contrast in described focusing square, black white contrast is larger, and presentation video is more clear.
4. the method for testing camera module according to claim 3, is characterized in that, before utilizing camera module to take picture, also comprises step:
The picture being used for testing camera module is placed in the sidepiece of light box;
Camera module to be placed in light box and to make described picture mutually vertical with the optical axis direction of described camera module.
5. the method for testing camera module according to claim 3, is characterized in that, when utilizing described camera module to take picture, takes respectively in following three kinds of situations:
The anti-hand shake device of camera module is not opened and camera module is not shaken when, obtain the first image, determine the first rectangular width D in the first image
x1and the second rectangular width D
y1;
The anti-hand shake device of camera module do not open and camera module shake when, obtain the second image, determine the first rectangular width D in the second image
x2and the second rectangular width D
y2;
The anti-hand shake device of camera module open and camera module shake when, obtain the 3rd image, determine the first rectangular width D in the 3rd image
x3and the second rectangular width D
y3;
According to following formulae discovery stabilization ability:
Stabilization ability D on first rectangle Width
x_ dB=20Log
10(D
x3-D
x1)/(D
x2-D
x1);
Stabilization ability D on second rectangle Width
y_ Db=20Log
10(D
y3-D
y1)/(D
y2– D
y1).
6. the method for testing camera module according to claim 5, is characterized in that, the first rectangular width D
xcalculate according to the number of pixels of the white portion on the first rectangle Width and determine, the second rectangular width D
ycalculate according to the number of pixels of the white portion on the second rectangle Width and determine, wherein R, G, B value is all greater than the pixel for white portion of 200, and R, G, B value is all less than the pixel for black region of 200.
7. the method for testing camera module according to claim 5, is characterized in that, the computing formula of compression ratio is:
Compression ratio on first rectangle Width:
D
x_％＝100-((D
x3-D
x1)/((D
x2-D
x1)))*100；
Compression ratio on second rectangle Width:
D
y_％＝100-((D
y3-D
y1)/((D
y2–D
y1)))*100。
8. the method for testing camera module according to claim 5, is characterized in that, the first image, the second image and the 3rd image are square.
9. the method for testing camera module according to claim 3, is characterized in that, the number of described cross is four, and four described crosses are distributed on the symmetry axis of described picture side by side.
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| CN109186940A (en) * | 2018-08-01 | 2019-01-11 | 昆山丘钛微电子科技有限公司 | The monitoring method of measuring accuracy and the monitoring device of measuring accuracy |
| CN112954314A (en) * | 2021-02-08 | 2021-06-11 | 南昌欧菲光电技术有限公司 | Graph card, device and method for testing optical jitter of camera module |
| CN113784112A (en) * | 2021-08-26 | 2021-12-10 | 昆山丘钛微电子科技股份有限公司 | Camera module testing method and device, test chart board and system |
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