CN206740363U - A kind of detection optical system is as the system of matter - Google Patents
A kind of detection optical system is as the system of matter Download PDFInfo
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- CN206740363U CN206740363U CN201621456275.7U CN201621456275U CN206740363U CN 206740363 U CN206740363 U CN 206740363U CN 201621456275 U CN201621456275 U CN 201621456275U CN 206740363 U CN206740363 U CN 206740363U
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Abstract
The utility model discloses a kind of detection optical system as the system of matter, the system include reference material, image acquisition units and image analyzing unit；Reference material is located at the object space focal length of tested optical system；Reference material is the display screen with drive circuit, and drive circuit driving display screen shows the figure for measuring a variety of optical parametrics of optical system；Or reference material includes test chart and area source, test chart is between area source and detected optical system, and under the irradiation of area source, test chart shows the figure for measuring a variety of optical parametrics of optical system；Image acquisition units are located at the image space of optical system, pass through the picture of reference material formed by a shooting, collecting optical system；Image analyzing unit obtains and analyzed the image that image acquisition units collect, and obtains the parameter of reflection optical system picture element.Compared to the subjective assessment of human eye, this programme is objective effectively, and repetitive rate is good, suitable for the detection of mass.
Description
Technical field
It the utility model is related to optical technical field, and in particular to a kind of detection optical system is as the system of matter.
Background technology
In the market virtual reality products species is more and more, and the usage experience of terminal user is also uneven.In numerous shadows
In the factor for ringing Consumer's Experience, the image quality of nearly optics of the eye system will be mostly important.Good image quality can give and use
Stronger presence and feeling of immersion are brought in family, lift Quality of experience.
It is to be based on simulation software mostly, to designed optical system in the existing evaluation of programme for optical system picture element
System is evaluated with regard to MTF, point spread function etc., and this mode is based only upon theoretical evaluation, can not be carried out with regard to the product in actual production
Accurate measurement.
Utility model content
The utility model provides a kind of system of detection optical system as matter, existing for optical system picture to solve
The evaluation of programme of matter is based only upon theoretical evaluation, can not with regard in actual production product carry out accurate measurement the problem of.
According to one side of the present utility model, the utility model provides a kind of system of detection optical system as matter,
Including：Reference material, image acquisition units, image analyzing unit；
The reference material is located at the object space focal length of the optical system；The reference material is the display with drive circuit
Screen, the drive circuit drive the display screen to show the figure for measuring a variety of optical parametrics of optical system；It is or described
Reference material includes test chart and area source, the test chart between the area source and detected optical system,
Under the irradiation of the area source, the test chart shows the figure for measuring a variety of optical parametrics of optical system；
Described image collecting unit is located at the image space of the optical system, for passing through optical system described in a shooting, collecting
The picture of the reference material formed by system；
Described image analytic unit, the image collected for obtaining and analyzing described image collecting unit, obtain reflection
The parameter of the optical system picture element.
The beneficial effects of the utility model are：The utility model embodiment is by test chart or can be with display test pattern
Display screen is placed at the object space focal length of detected optical system as reference material, and the figure contains the different optical parametrics of measurement
Multiple images feature, the picture in image space using CCD camera etc. by a shooting, collecting reference material, finally utilizes built-in computer
The image processing and analyzing software analysis image, one group of parameter of the detected optical system picture element of reflection is obtained, compared to people
The subjective assessment of eye, this programme is objective effectively, and repetitive rate is good；Compare fine measuring instrument, and this programme speed is fast, efficiency high,
Suitable for the detection of mass.
Brief description of the drawings
Fig. 1 is a kind of detection optical system of the utility model one embodiment offer as the structural representation of the system of matter
Figure；
Fig. 2 is a kind of schematic diagram for test chart that the utility model one embodiment provides.
Embodiment
Design concept of the present utility model is：The existing evaluation of programme for optical system picture element is soft based on emulating mostly
Part, optical system is evaluated with regard to MTF, point spread function etc., this mode is based only upon theoretical evaluation, can not be with regard in actual production
Product carry out accurate measurement.For such case, the utility model is by test chart or can be with the display of display test pattern
Screen is placed at the object space focal length of detected optical system as reference material, and the figure contains the multiple of the different optical parametrics of measurement
Characteristics of image, picture of the CCD camera by a shooting, collecting reference material is used in image space, finally utilizes the image of built-in computer
The Treatment Analysis software analysis image, one group of parameter of the detected optical system picture element of reflection is obtained, compared to the master of human eye
Evaluation is seen, this programme is objective effectively, and repetitive rate is good；Compare fine measuring instrument, and this programme speed is fast, efficiency high, is applied to
The detection of mass.
Embodiment one
Fig. 1 is a kind of detection optical system of the utility model one embodiment offer as the structural representation of the system of matter
Figure, as shown in figure 1, the detection optical system that the present embodiment provides is as the system of matter includes：Reference material 110, image acquisition units
120th, image analyzing unit 130.
Reference material 110 is positioned at the object space focal length of optical system, and reference material 110 can include test chart and face light
Source, test chart is between area source and detected optical system, and under the irradiation of area source, test chart, which is shown, to be used for
Measure the figure of a variety of optical parametrics of optical system；Reference material 110 can also be the display screen with drive circuit, drive circuit
Driving display screen shows the figure for measuring a variety of optical parametrics of optical system, such as the big identical such as display and resolving power test target
Test pattern is as thing.
Image acquisition units 120 are located at the image space of optical system, for by formed by a shooting, collecting optical system
The picture of reference material 110.Image acquisition units 120 can be CCD camera or CMOS cameras, simulate human eye, generally CCD phases
The image quality of machine is better than CMOS cameras, therefore better using CCD camera, and reference material 110 is located at object space focal length, comprising
The light of object information is obtained by CCD camera and imaged at sensor by being changed into directional light after being detected optical system transmission,
Required camera minimum visual field requirement can pass through detected optical system and the display screen or test chart Size calculation that are used cooperatively
Draw.The resolution ratio of CCD camera needs the resolution ratio of the display screen or test chart much larger than reference material 110, if reference material 110
For display screen, then the resolution ratio of the sensor of CCD camera should be much larger than the resolution ratio of display screen, i.e., guarantee display screen is each
Pixel is at least identified after optical system by one of pixel of sensor.
The field range of CCD camera is sufficiently large, and test chart or display screen can be obtained completely by the picture of optical system
Taking, in the leading portion of camera lens, lens distortion is small, less than 1%, can be neglected compared with detected optical system for the entrance pupils of camera lens,
Color reducibility and high resolution, the MTF curve of CCD camera are detected optics, it is known that be cascaded in series for effect by optical system
The MTF of system is the MTF of total system and the ratio of CCD camera.
Image analyzing unit 130, the image collected for obtaining and analyzing image acquisition units 120, obtain reflection light
System is as the parameter of matter.In a preferred embodiment, image analyzing unit 130 includes image pick-up card 131 and computer 132.
Image pick-up card 131 obtains the image that image acquisition units 120 gather, the image that computer 132 gathers image pick-up card 131
Over the display, computer 132 is calculated using software and image is carried out by built-in image processing and analyzing software afterwards for display
Analyzing and processing, there is one group of parameter according to what the image of collection obtained representing detected optical system picture element, such as can include
MTF (Modulation Transfer Function, modulation transfer function), contrast, resolution ratio, brightness uniformity, distortion,
Color rendition degree and saturation degree etc..CCD camera obtains optical system imaging by disposably shooting, at software algorithm
The parameter required time that reason can obtain the detected optical system picture element of reflection is shorter, can reach quick detection and the effect of evaluation
Fruit, during can be widely applied to commodity production.Compared to the subjective assessment of human eye, this method is objective effectively, and repetitive rate is good；
Compare fine measuring instrument, and this method speed is fast, efficiency high, suitable for the detection of mass.
Also include being used for the lightproof unit 140 that no light conditions are provided in preferred embodiment.Reference material 110, IMAQ list
Member 120 and detected optical system are placed in the no light conditions of the offer of lightproof unit 140, the process for gathering whole image
Carried out under no light conditions, prevent ambient from being had an impact to testing result.
It is further preferred that using the present embodiment detection optical system as matter system evaluation optical system picture element it
Before, the system should also be demarcated, that is, calibrate the system, reduce systematic error, improve the accuracy of system detectio.Can be with
Choose sample optical system known to a parameter, such as the optical system detected by accurate measuring apparatus.Utilize this reality
The detection optical system of example offer is applied as the system detectio of the matter sample optical system is as matter, the parameter of acquisition sample optical system
Detected value, such as MTF, distortion, by the way that the detected value of sample optical systematic parameter and actual value are contrasted, you can to this
The detection optical system that embodiment provides is demarcated as the system of matter, reduces CCD camera/COMS cameras and image pick-up card etc.
The systematic error that part introduces, the testing result after being allowed to are more accurate.
Embodiment two
Fig. 2 is a kind of schematic diagram for test chart that the utility model one embodiment provides, as shown in Fig. 2 this implementation
The test chart that example provides can show the figure of a variety of optical parametrics for detection optical system, the figure under light source irradiation
Shape contains the multiple images feature for measuring different optical parametrics.
The figure that test chart is shown is the rectangle using ater as background colour, and with the horizontal center line of rectangle and vertically
Center line is symmetrical.
Rectangular centre and corner are respectively arranged with gridiron pattern area, for measuring the contrast of optical system.It is specific real one
Apply in example, the gridiron pattern area of rectangular centre is provided centrally with a white square, and the gridiron pattern area of rectangle corner is provided with the black of 2*2
White alternate square.Relative luminance can be obtained by the way that the brightness of corner and center is carried out into contrast
Wherein IcenterRepresent the high-high brightness of central vision, IcornerRepresent the brightness of corner.
In the center of pattern and corner, each gridiron pattern area both horizontally and vertically on, be provided with black and white strip band, be used for
The MTF and resolution ratio of optical system are measured, black and white striped band includes the black and white line pair of different frequency, the black and white line pair of each frequency
Occupied area is equal.In a specific embodiment, the black and white line pair of 5 kinds of different frequencies is provided with black and white striped band, with
Relation centered on gridiron pattern area from outside to inside between each frequency is：1:1.5:2:3:6.The test pattern can allow to measure son simultaneously
Noon and the image quality of sagitta of arc both direction, and the picture matter of visual field and the outer visual field of axle on axle can be measured simultaneously.By contrasting certain
The contrast of the black and white strip before and after imaging under one frequency obtains mtf value,Wherein Imax
And IminRespectively it is detected the light intensity maxima and minima of optical system imaging.The resolution chart contains multiple frequencies
Image quality under rate, a certain specific frequency can both be evaluated, again can be according to after being fitted as matter under multiple points
MTF curve.
In 4 quadrants being isolated into the gridiron pattern area of rectangular centre and black and white strip band, 2*3 side is respectively arranged with
Block matrix, the color of square is corresponding with 24 colour standard colour tables, for measuring optical system color rendition degree.Software analysis can be passed through
The color saturation of imaging judges whether color rendition meets the requirements with color error, in Lab chrominance spaces, leading indicator
For aberrationColor saturationWherein a*
It is standard value with b*.
Some concentric whites are provided between the black and white strip band of rectangle corner and the black and white strip band of rectangular centre
Rectangular mesh, in a specific embodiment, grid is respectively positioned at maximum field of view, 0.7 visual field and 0.5 for being detected optical system
Visual field, grid are used for the distortion for measuring optical system, and the formula for calculating distortion isWherein Δ H is son
Noon or the maximum deformation quantity in sagitta of arc direction, H are feature size before initial deformation.
For the parameter without Color Characteristics, such as distortion, MTF, contrast, first the image got can be converted into
Gray-scale map (grey0~grey255), the analysis to image is then realized by software.In the present embodiment, as grid size and
The spacing of black and white strip can be adjusted and set with parameter interested according to the characteristics of detected optical system.
The test chart that the present embodiment provides can be shown under light source irradiation contains the different optical parametrics of measurement
The resolution chart of multiple images feature, by shooting, collecting of CCD camera through being detected optical system imaging, and by picture
It is shown on display screen, the processing through software algorithm can disposably obtain reflecting system under test (SUT) as one group of parameter of matter, detection effect
Rate is high, suitable for mass production.
It is described above, only specific embodiment of the present utility model, under above-mentioned teaching of the present utility model, this area
Technical staff can carry out other improvement or deformation on the basis of above-described embodiment.It will be understood by those skilled in the art that
Above-mentioned specific descriptions simply preferably explain the purpose of this utility model, and the scope of protection of the utility model should be with claim
Protection domain be defined.
Claims (5)
1. a kind of detection optical system is as the system of matter, it is characterised in that the system includes：Reference material, image acquisition units,
Image analyzing unit；
The reference material is located at the object space focal length of the optical system；The reference material is the display screen with drive circuit,
The drive circuit drives the display screen to show the figure for measuring a variety of optical parametrics of optical system；Or the mark
Quasi- thing includes test chart and area source, the test chart between the area source and detected optical system,
Under the irradiation of the area source, the test chart shows the figure for measuring a variety of optical parametrics of optical system；
Described image collecting unit is located at the image space of the optical system, for passing through optical system institute described in a shooting, collecting
Into the reference material picture；
Described image analytic unit, the image collected for obtaining and analyzing described image collecting unit, obtain described in reflection
The parameter of optical system picture element.
2. the system as claimed in claim 1, it is characterised in that also include being used for the lightproof unit that no light conditions are provided；It is described
Reference material, described image collecting unit and detected optical system are placed in the no light conditions that the lightproof unit provides.
3. the system as claimed in claim 1, it is characterised in that described image collecting unit is CCD camera or CMOS cameras；Institute
State resolution ratio of the resolution ratio much larger than the display screen or the test chart of CCD camera or the CMOS cameras.
4. the system as claimed in claim 1, it is characterised in that described image analytic unit includes image pick-up card and calculating
Machine；
Described image capture card, for obtaining the image of described image collecting unit collection；
The computer, the image for described image capture card to be gathered show over the display, and obtained according to described image
Take the parameter of the optical system picture element；The parameter includes MTF, contrast, resolution ratio, brightness uniformity, distortion, color also
It is a variety of in former degree and saturation degree.
5. system as claimed in claim 4, it is characterised in that the computer is additionally operable to according to the inspection to sample optical system
The actual physics parameter of result and institute's sample optical system is surveyed, to the detection optical system as the system of matter is demarcated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621456275.7U CN206740363U (en) | 2016-12-28 | 2016-12-28 | A kind of detection optical system is as the system of matter |
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| CN201621456275.7U CN206740363U (en) | 2016-12-28 | 2016-12-28 | A kind of detection optical system is as the system of matter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596073A (en) * | 2016-12-28 | 2017-04-26 | 歌尔科技有限公司 | Method and system for detecting image quality of optical system, and testing target plate |
| CN108924545A (en) * | 2018-07-02 | 2018-11-30 | 昆山丘钛微电子科技有限公司 | The veiling glare detection device and detection method of camera module |
| CN109596319A (en) * | 2018-11-26 | 2019-04-09 | 歌尔股份有限公司 | The detection system and method for optics module parameter |
-
2016
- 2016-12-28 CN CN201621456275.7U patent/CN206740363U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596073A (en) * | 2016-12-28 | 2017-04-26 | 歌尔科技有限公司 | Method and system for detecting image quality of optical system, and testing target plate |
| CN108924545A (en) * | 2018-07-02 | 2018-11-30 | 昆山丘钛微电子科技有限公司 | The veiling glare detection device and detection method of camera module |
| CN109596319A (en) * | 2018-11-26 | 2019-04-09 | 歌尔股份有限公司 | The detection system and method for optics module parameter |
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Effective date of registration: 20201013 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 266104 Laoshan Qingdao District North House Street investment service center room, Room 308, Shandong Patentee before: GOERTEK TECHNOLOGY Co.,Ltd. |
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