CN101957553B - Method for measuring modulation transfer function value of measurement lens - Google Patents

Method for measuring modulation transfer function value of measurement lens Download PDF

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Publication number
CN101957553B
CN101957553B CN200910304488.6A CN200910304488A CN101957553B CN 101957553 B CN101957553 B CN 101957553B CN 200910304488 A CN200910304488 A CN 200910304488A CN 101957553 B CN101957553 B CN 101957553B
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camera lens
measured
test
transfer function
function value
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CN200910304488.6A
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Chinese (zh)
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CN101957553A (en
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赖志成
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鸿富锦精密工业(深圳)有限公司
鸿海精密工业股份有限公司
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Abstract

The invention discloses a method for measuring the modulation transfer function value of a measurement lens, which comprises: acquiring continuous modulation transfer function value for the lens to be tested to image a plurality of test patterns at a continuous image distance by using a mobile image sensor, and acquiring the continuous relationship curve of the object distance of the lens to be tested and the modulation transfer function value according to a Gauss imaging formula; rotating the lens to be tested around the optical axis of the lens at the same angle for many times to a plurality of test positions to image the test patterns corresponding to the positions respectively, and acquiring the modulation transfer function values of the images; obtaining a plurality of object distance values corresponding to the modulation transfer function values obtained at the plurality of test positions from the continuous relationship curve, and adjusting a bearing table according to the plurality of object distances to make the distances between the bearing table and a test plate at the positions of the plurality of test patterns equal; and moving the bearing table along the optical axis of the lens to be tested and relative to the test plate for testing the accurate modulation transfer function value of the lens to be tested.

Description

Measure the method for the modulating transfer function value of camera lens

Technical field

The present invention relates to Shot Detection technical field, relate in particular to a kind of method of measuring the modulating transfer function value of camera lens.

Background technology

The quality of image of digital camera, video camera and the first-class imaging object of cell-phone camera depends primarily on the image quality of camera lens, and the monitoring of the image quality of camera lens is the test process of camera lens.Modulating transfer function value (Modulation Transfer Function, MTF) is that a kind of resolving power of camera lens of analyzing is with an important parameter of acutance, contrast and the resolution of contrast rendition ability, comprehensive evaluation camera lens.Referring to document: A simple method for determining the modulation transfer function indigital radiography; Fujita, H., Tsai, D-Y., Itoh, T., Department of Electronic & Computer Engineering, England, Gifu University; Medical imaging, IEEE transactions on; Pages34~39, Volume11, Issue1, March.1992.

The device of conventional measurement camera lens modulating transfer function value comprises test board, plummer, driver element, imageing sensor and the processor that is provided with light and dark pattern.Test board and imageing sensor are oppositely arranged.Plummer is used for placing camera lens to be measured.Driver element is connected in plummer, for driving camera lens to be measured optical axis along camera lens to be measured between test board and imageing sensor to move up and down, so that the pattern of test board forms image on imageing sensor.Imageing sensor is the brightness maximal value I via the imaging of camera lens to be measured for sensing maxwith minimum value I min.Described processor is connected in described imageing sensor, is worth most, according to formula MTF=(I for receiving the brightness of camera lens imaging to be measured max-I min)/(I max+ I min) calculate the modulating transfer function value of this imaging, and then judge that whether camera lens is qualified.

Yet, in test process, plummer may tilt with respect to test board or imageing sensor, cause the optical axis of carrying camera lens to be measured thereon also not vertical with test board or imageing sensor, thereby make maximal value and the minimum value of the brightness that imageing sensor senses occur deviation, cause the modulating transfer function value of camera lens to be measured of final gained inaccurate.

Therefore, be necessary to provide a kind of method of modulating transfer function value that can Measurement accuracy camera lens.

Summary of the invention

A kind of method of measuring camera lens modulating transfer function value, comprise step: provide test board, imageing sensor, plummer, processor and camera lens to be measured, described test board has a plurality of centrosymmetric test patterns with respect to test board, described imageing sensor is relative with described test board, imaging for sensing test pattern via camera lens to be measured, described plummer is used for carrying camera lens to be measured, it is between described test board and imageing sensor, described processor is connected in described imageing sensor, for the treatment of and obtain the modulating transfer function value of the imaging that imageing sensor senses, thereby make imageing sensor with respect to camera lens to be measured along the optical axis of camera lens to be measured move obtain camera lens to be measured to a plurality of test patterns with continuous image the continuous modulation transfer function values apart from imaging, and obtain the object distance of camera lens to be measured and the serial relation curve of this modulating transfer function value according to Gaussian imaging equation, thereby camera lens to be measured is carried out repeatedly to equal angles rotation around self optical axis, obtain a plurality of test positions, during each test position respectively to the corresponding test pattern imaging of this test position, and obtain the modulating transfer function value of this imaging, on serial relation curve, obtain a plurality of object distance values corresponding with a plurality of modulating transfer function values that obtain on the plurality of test position, and adjust plummer so that plummer equates with the distance values of described test board at a plurality of test patterns place according to described a plurality of object distance values, make plummer with respect to described test board, along the optical axis of camera lens to be measured, move to test the accurate modulating transfer function value of camera lens to be measured.

The method of the modulating transfer function value of the measurement camera lens that the technical program provides is proofreaied and correct plummer with respect to the inclination of test board before test.By mobile camera lens to be measured, test again.The deviation that the method can avoid the inclination of plummer to bring, thus maximal value and the minimum value of the brightness of image of pattern accurately obtained, and then improve the modulating transfer function value measuring accuracy of camera lens to be measured.

Accompanying drawing explanation

Fig. 1 is the structural representation of the measurement mechanism of the modulating transfer function value that provides of the technical program the first embodiment.

Fig. 2 is the schematic diagram of test board in the measurement mechanism of the modulating transfer function value that provides of the technical program the first embodiment.

Fig. 3 is the object distance of camera lens to be measured and the serial relation curve of this modulating transfer function value of the measuring method second step gained of the modulating transfer function value that provides of the technical program the first embodiment.

Fig. 4 is measuring method the 3rd step view of the modulating transfer function value that provides of the technical program the first embodiment.

Fig. 5 is the schematic diagram of test board in the measurement mechanism of the modulating transfer function value that provides of the technical program the second embodiment.

Embodiment

Below in conjunction with accompanying drawing and a plurality of embodiment, the method for the modulating transfer function value of the measurement camera lens of the technical program is described in further detail.

The method of the modulating transfer function value of the measurement camera lens that the technical program provides can comprise the following steps:

The first step, provides camera lens modulation transfer function value measuring apparatus 10 and camera lens to be measured 100.Described camera lens modulation transfer function value measuring apparatus 10 comprises test board 11, imageing sensor 12, plummer 13, processor 14, the first driver 15 and the second driver 16, as shown in Figure 1.

Described test board 11 can be square, and its surface has a plurality of centrosymmetric test patterns with respect to test board 11, and each test pattern all can comprise a plurality of stripeds that are intervally arranged.As shown in Figure 2, the test board 11 that the technical program embodiment provides is for square, it comprises four test patterns, from the upper right corner of described test board 11, starts clockwise, is respectively the first test pattern 110, the second test pattern 111, the 3rd test pattern 112 and the 4th test pattern 113.Described the first test pattern 110, the second test pattern 111, the 3rd test pattern 112 and the 4th test pattern 113 comprise three dark fringes that are intervally arranged 114 separately.Certainly, to be not limited to be three to the quantity of described dark fringe 114.Described the first test pattern 110, the second test pattern 111, the 3rd test pattern 112 and the 4th test pattern 113 be a drift angle of close described test board 11 respectively, and distributes around described test board 11 center equal angles.So, after the 90-degree rotation of described test board 11Rao Qi center, each test pattern all overlaps with the test pattern being adjacent before rotation, for example, by described test board 11 after the hour hands 90-degree rotation of being wherein in a good mood, the first test pattern 110 overlaps with the second test pattern 111 before rotation, and the second test pattern 111 overlaps with the 3rd test pattern 112 before rotation.

Described imageing sensor 12 is oppositely arranged with described test board 11.Described imageing sensor 12 is the brightness value via camera lens 100 imagings to be measured for each test pattern of sensing.Imageing sensor 12 can be charge-coupled image sensor or cmos image sensor.

Described plummer 13 is for carrying camera lens 100 to be measured, and it is between described test board 11 and imageing sensor 12.

Described processor 14 is connected in described imageing sensor 12, for the test pattern that receives the described test board 11 that described imageing sensor 12 senses through the brightness value of camera lens 100 imagings to be measured and calculate the modulating transfer function value of this imaging.

Described the first driver 15 and described imageing sensor 12 mechanical connections, for driving described imageing sensor 12, with respect to camera lens 100 to be measured, the optical axis along camera lens 100 to be measured moves.Described the first driver 15 can be piezoelectric element or motor, and it has the first output shaft 150.Described the first output shaft 150 is mechanically connected to described imageing sensor 12.

Described the second driver 16 and described plummer 13 mechanical connections, for driving plummer 13 to move along the in-plane perpendicular to test board 11 places with respect to test board 11.Described the second driver 16 also can be piezoelectric element or motor, and it has the second output shaft 160.Described the second output shaft 160 is mechanically connected to described plummer 13.

The focal length of camera lens 100 to be measured is F, and it is carried on described plummer 13.

Second step, thereby make imageing sensor 12 with respect to camera lens 100 to be measured along the optical axis of camera lens 100 to be measured move obtain 100 pairs of a plurality of test patterns of camera lens to be measured with continuous image the continuous modulation transfer function values apart from imaging, and obtain the object distance of camera lens 100 to be measured and the serial relation curve of this modulating transfer function value according to Gaussian imaging equation.

Particularly, the optical axis along camera lens 100 to be measured moves with respect to camera lens 100 to be measured by the first driver 15, to drive described imageing sensor 12, described imageing sensor 12 sensings during from camera lens 100 different spacing to be measured the first test pattern 110, the second test pattern 111, the 3rd test pattern 112 and the 4th test pattern 113 on (during camera lens 100 different image distance V to be measured) test board 11 through the brightness value of camera lens 100 imagings to be measured.100 pairs of a plurality of test patterns of camera lens to be measured that the described imageing sensor 12 of described processor 14 reception senses are the continuous modulation transfer function values apart from imaging with continuous image.The focal length of camera lens 100 to be measured is F, according to Gaussian imaging equation 1/U+1/V=1/F, 100 pairs of a plurality of test patterns of camera lens to be measured are converted into the object distance of camera lens 100 to be measured and the serial relation curve of this modulating transfer function value with continuous image apart from the relation curve of the continuous modulation transfer function values of imaging.For example, obtain curve as shown in Figure 3.

The 3rd step, obtains a plurality of test positions thereby camera lens 100 to be measured is carried out repeatedly to equal angles rotation around self optical axis, during each test position respectively to the corresponding test pattern imaging of this test position, and obtain the modulating transfer function value of this imaging.

The anglec of rotation of camera lens 100 to be measured is identical with the angle overlapping after adjacent two test patterns rotation, thereby the distribution of a plurality of test patterns is all identical during each test position.Be appreciated that, in the present embodiment, after the 90-degree rotation of described test board 11Rao Qi center, each test pattern all overlaps with the test pattern being adjacent before rotation, thereby the every 90-degree rotation of camera lens 100 to be measured arrives a test position, and when now the distribution of a plurality of test patterns is with a upper test position, the distribution of a plurality of test patterns is identical.

Particularly, refer to Fig. 4, in the present embodiment, first camera lens 100 to be measured is placed on plummer 13, suppose that now camera lens 100 to be measured is positioned at the first test position, its cue mark is corresponding with described the first test pattern 110, the optical axis along camera lens 100 to be measured moves with respect to camera lens 100 to be measured to utilize the first driver 15 to drive described imageing sensor 12, the modulating transfer function value that described processor 14 obtains described the first test pattern 110 correspondences by the first test pattern 110 on the test board 11 that calculates described imageing sensor 12 and sense through the value of the brightness of camera lens 100 imagings to be measured is MTF1.In the present embodiment, by camera lens 100 to be measured before self optical axis is rotated, before and after camera lens to be measured 100 rotations that also will mark to indicate on camera lens 100 to be measured with plummer 13 between relative position and judge the angle that camera lens 100 to be measured rotates.If, camera lens 100 to be measured is when the first test position, described indicia point the first test pattern 110 place drift angles.Certainly, described mark is not necessarily arranged at camera lens 100 to be measured, also can be arranged at plummer 13, only needs done mark can indicate camera lens 100 to be measured with respect to the angle of plummer 13 rotations.

Then camera lens 100 to be measured is turn 90 degrees and is located at the second test position around self optical axis dextrorotation from primary importance, the second test pattern 111 place drift angles described in the indicia point of camera lens 100 to be measured now, it is MTF2 that the identical method of take records the now modulating transfer function value of described the second test pattern 111 correspondences.

Again camera lens 100 to be measured is turn 90 degrees and is located at the 3rd test position around self optical axis dextrorotation from the second place, the 3rd test pattern 112 place drift angles described in the indicia point on camera lens 100 to be measured now, recording the now modulating transfer function value of described the 3rd test pattern 112 correspondences is MTF3.

Last camera lens to be measured 100 turn 90 degrees and is located at the 4th test position from the 3rd position around self optical axis dextrorotation, the 4th test pattern 113 place drift angles described in the indicia point of camera lens 100 to be measured now, recording the now modulating transfer function value of described the 4th test pattern 113 correspondences is MTF4.

The 4th step, on serial relation curve, obtain a plurality of object distance values corresponding with the modulating transfer function value obtaining on the plurality of test position, and adjust plummer 13 so that plummer 13 equates with the distance values of described test board 11 at a plurality of test patterns place according to described a plurality of object distance values.

Particularly, on serial relation curve, find out the 3rd object distance U3 that the modulating transfer function value MTF3 of the second object distance U2 that the modulating transfer function value MTF2 of the first object distance U1 that the modulating transfer function value MTF1 of the first test pattern 110 obtaining with the 3rd pacing is corresponding, the second test pattern 111 is corresponding, the 3rd test pattern 112 is corresponding and the 4th object distance U4 corresponding to modulating transfer function value MTF4 of the 4th test pattern 113.Described the first object distance U1 is described test board 11 distance along the in-plane perpendicular to test board 11 places between the first test pattern 110 places and plummer 13.Described the second object distance U2 is described test board 11 distance along the in-plane perpendicular to test board 11 places between the second test pattern 111 places and plummer 13.Described the 3rd object distance U3 is described test board 11 distance along the in-plane perpendicular to test board 11 places between the 3rd test pattern 112 places and plummer 13.Described the 4th object distance U4 is described test board 11 distance along the in-plane perpendicular to test board 11 places between the 4th test pattern 113 places and plummer 13.According to the first object distance U1, the second object distance U2, the 3rd object distance U3 and the 4th object distance U4, adjust plummer 13, as described in making as adjusted, plummer 13 and test board 11 are U1 apart from size respectively between the first test pattern 110, the second test pattern 111, the 3rd test pattern 112 and the 4th test pattern 113 places, thereby proofread and correct described plummer 13 with respect to the inclination of test board 11.

The 5th step, the optical axis along camera lens 100 to be measured moves with respect to described test board 11 to drive plummer 13, tests the accurate modulating transfer function value of camera lens 100 to be measured.

Concrete, by the second driver 16, drive plummer 13 to move perpendicular to test board 11 place in-planes with respect to described test board 11 edges, if in this moving process, the first test pattern 110, the second test pattern 111, the 3rd test pattern 112 and the 4th test pattern 113 that imageing sensor 12 senses on test board 11 are I through the maximum brightness value of camera lens 100 imagings to be measured max, minimum luminance value is I min, the mtf value of camera lens 100 to be measured=(I max-I min)/(I max+ I min).

The method of the modulating transfer function value of the measurement camera lens that the technical program provides is proofreaied and correct plummer with respect to the inclination of test board before test.By mobile camera lens to be measured, test again.The deviation that the method can avoid the inclination of plummer to bring, thus maximal value and the minimum value of the brightness of image of pattern accurately obtained, and then improve the modulating transfer function value measuring accuracy of camera lens to be measured.

Refer to Fig. 5, the measuring method of the modulating transfer function value that the technical program the second embodiment provides and the first embodiment's is roughly the same, and its difference is, in the present embodiment, described test board 21 only comprises two test patterns, is respectively the first test pattern 210 and the second test pattern 211.Described the first test pattern 210 and the second test pattern 211 comprise respectively three dark fringes that are intervally arranged 214.Described the first test pattern 210 and the second test pattern 211 are with respect to the Central Symmetry of described test board 21.In the present embodiment, respectively near one in relative two sides of described test board 21, and on it, bearing of trend of dark fringe 214 side close with it is vertical.

Because quantity and the distribution mode of test pattern are different, test board 21 needs Rotate 180 degree, and the shape of a plurality of test patterns on it and distribution just can overlap with a upper position.Thereby, in the 3rd step of measuring method of modulating transfer function value that makes the present embodiment, only need to record camera lens 100 rotation 0 degree to be measured and 180 and spend corresponding modulating transfer function value.In the 4th step, only need on the object distance U of camera lens 100 to be measured and the relation curve of the first modulating transfer function value, find with 0 degree and 180 and spend corresponding corresponding the first object distance of modulating transfer function value and the second object distance, while adjusting plummer, make described plummer and the described test board distance values at the first test pattern and the second test pattern place be the first object distance or the second object distance.So, also can realize the inclination of proofreading and correct described plummer.

Certainly, the quantity of the test pattern on described test board is not limited to as two or four, can also be three, five or more, only need after test board rotation, identical with the imaging of a upper test position via the position of a plurality of test patterns of the imaging of camera lens to be measured.Be understandable that, described test pattern is more, thereby can make rotation of lens to be measured obtain more object distance to more position, and that for the inclination of plummer, can proofread and correct is more accurate.

Be understandable that, for the person of ordinary skill of the art, can make other various corresponding changes and distortion according to the technical conceive of the technical program, and all these change and distortion all should belong to the protection domain of the technical program claim.

Claims (10)

1. a method of measuring camera lens modulating transfer function value, comprises step:
Test board, imageing sensor, plummer, processor and camera lens to be measured are provided, described test board has a plurality of centrosymmetric test patterns with respect to test board, described imageing sensor is relative with described test board, imaging for sensing test pattern via camera lens to be measured, described plummer is used for carrying camera lens to be measured, it is between described test board and imageing sensor, described processor is connected in described imageing sensor, for the treatment of and obtain the modulating transfer function value of the imaging that imageing sensor senses;
Thereby make imageing sensor with respect to camera lens to be measured along the optical axis of camera lens to be measured move obtain camera lens to be measured to a plurality of test patterns with continuous image the continuous modulation transfer function values apart from imaging, and obtain the object distance of camera lens to be measured and the serial relation curve of this modulating transfer function value according to Gaussian imaging equation;
Thereby camera lens to be measured is carried out repeatedly to equal angles rotation around self optical axis, obtain a plurality of test positions, during each test position respectively to the corresponding test pattern imaging of this test position, and obtain the modulating transfer function value of this imaging;
On serial relation curve, obtain a plurality of object distance values corresponding with a plurality of modulating transfer function values that obtain on the plurality of test position, and adjust plummer so that plummer equates with the distance values of described test board at a plurality of test patterns place according to described a plurality of object distance values;
Make plummer with respect to described test board, along the optical axis of camera lens to be measured, move to test the accurate modulating transfer function value of camera lens to be measured.
2. the method for measurement camera lens modulating transfer function value as claimed in claim 1, is characterized in that, described test board has four test patterns, and described camera lens to be measured is 90 degree around the anglec of rotation of self optical axis.
3. the method for measurement camera lens modulating transfer function value as claimed in claim 1, is characterized in that, described test board has two test patterns, and described camera lens to be measured is 180 degree around the anglec of rotation of self optical axis.
4. the method for measurement camera lens modulating transfer function value as claimed in claim 1, is characterized in that, each test pattern includes a plurality of dark fringes that are intervally arranged.
5. the method for measurement camera lens modulating transfer function value as claimed in claim 1, it is characterized in that, described in the first driver drives of use and described imageing sensor mechanical connection, with respect to camera lens to be measured, the optical axis along camera lens to be measured moves imageing sensor, and with respect to test board, the optical axis along camera lens to be measured moves the second driver drives plummer of use and described plummer mechanical connection.
6. the method for measurement camera lens modulating transfer function value as claimed in claim 1, it is characterized in that, camera lens to be measured, before self optical axis carries out repeatedly equal angles rotation, is marked to indicate the relative position before and after rotation of lens to be measured and between plummer and judged the angle of rotation of lens to be measured described camera lens to be measured or plummer.
7. a method of measuring camera lens modulating transfer function value, comprises step:
Test board, imageing sensor, plummer, processor and camera lens to be measured are provided, described test board has centrosymmetric the first test pattern and the second test pattern with respect to test board, described imageing sensor is relative with described test board, imaging for each test pattern of sensing via camera lens to be measured, described plummer is used for carrying camera lens to be measured, it is between described test board and imageing sensor, described processor is connected in described imageing sensor, for the treatment of and obtain the modulating transfer function value of the imaging that imageing sensor senses;
Thereby make imageing sensor with respect to camera lens to be measured along the optical axis of camera lens to be measured move obtain camera lens to be measured to a plurality of test patterns with continuous image the continuous modulation transfer function values apart from imaging, and obtain the object distance of camera lens to be measured and the serial relation curve of this modulating transfer function value according to Gaussian imaging equation;
Thereby camera lens to be measured is carried out to twice equal angles rotation around self optical axis, obtain the first test position and the second test position, while obtaining the first test position respectively during to modulating transfer function value corresponding to described the first test pattern imaging and the second test position to modulating transfer function value corresponding to the second test pattern imaging;
On serial relation curve, obtain first object distance and second object distance corresponding with two modulating transfer function values that obtain on this first test position and the second test position, and adjust plummer so that plummer equates with the distance values of described test board at the first test pattern and the second test pattern place according to described the first object distance and the second object distance;
Make plummer with respect to described test board, along the optical axis of camera lens to be measured, move to test the accurate modulating transfer function value of camera lens to be measured.
8. the method for measurement camera lens modulating transfer function value as claimed in claim 7, is characterized in that, while adjusting plummer, makes plummer and the described test board distance values at the first test pattern and the second test pattern place be the first object distance or the second object distance.
9. the method for measurement camera lens modulating transfer function value as claimed in claim 7, it is characterized in that, described in the first driver drives of use and described imageing sensor mechanical connection, with respect to camera lens to be measured, the optical axis along camera lens to be measured moves imageing sensor, and with respect to test board, the optical axis along camera lens to be measured moves the second driver drives plummer of use and described plummer mechanical connection.
10. the method for measurement camera lens modulating transfer function value as claimed in claim 7, it is characterized in that, camera lens to be measured, before self optical axis carries out repeatedly equal angles rotation, is marked to indicate the relative position before and after rotation of lens to be measured and between plummer and judged the angle of rotation of lens to be measured described camera lens to be measured or plummer.
CN200910304488.6A 2009-07-17 2009-07-17 Method for measuring modulation transfer function value of measurement lens CN101957553B (en)

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