CN1241058C - Object plane adjustment method of optical projection system based on defocus depth analysis and its device - Google Patents
Object plane adjustment method of optical projection system based on defocus depth analysis and its device Download PDFInfo
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- CN1241058C CN1241058C CN 03115193 CN03115193A CN1241058C CN 1241058 C CN1241058 C CN 1241058C CN 03115193 CN03115193 CN 03115193 CN 03115193 A CN03115193 A CN 03115193A CN 1241058 C CN1241058 C CN 1241058C
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Abstract
The present invention discloses an object plane adjustment method of an optical projection system based on defocused depth analysis and a device. The object plane adjustment method of the optical projection system based on the defocused depth analysis comprises: installing a plurality of CCD image collecting assemblies on a projection screen of the optical projection system so as to obtain an image; obtaining the defocused amount, the inclined amount in the horizontal direction, the inclined amount in the vertical direction and the rotation amount of an optical projection system object plane LCD and the relative position deflection of three LCDs by analyzing the image; obtaining adjustment parameters. The present invention has the advantages of high adjustment correctness (comprising focusing, color mixture, inclination adjustment, rotation adjustment, etc.), no influence of subjective factors of operators, precision assurance by control systems, high adjustment speed, one-step extraction of the adjustment amount of 18 freedom degrees large-scale production requirement meeting, simple operation and no need of a great amount of experience of the operators.
Description
Technical field
The present invention relates to a kind of optical projection system object plane method of adjustment and device based on defocus depth analysis.
Background technology
Along with every optical unit continuous advancement in technology, the optical projection technology is ripe just gradually, or is forming batch process.Most typical as multimedia digital projector, digital projection TV etc.The object plane of this class optical projection system is generally LCD or other target, film etc.Owing in optical element, the mechanical component manufacture process certain error is arranged all, and whole optical system is very sensitive to error, the alignment error of LCD or target, the foozle of projection lens all can make whole optical projection system projected image bad, as without adjustment, projected image can't allow the people watch at all.
With the digital projection TV is example (multimedia overhead projector instrument principle is basic identical), and optical projection system comprises that light source and beam split part, three LCD, three looks synthesize and the first-class parts composition of projection lens.Wherein three LCD show the red, green, blue color image respectively, synthesize, projected on the display screen by projection lens through light illumination, synthesis system.Three LCD are fixed by the anchor clamps of corresponding band adjusting mechanism respectively.Each piece LCD all may exist inclination, translation and rotation equal error, and that each color image that projection is gone out exists is unintelligible, reference position is to, image rotation etc., and the projected image of three LCD is synthesized together, and three kinds of color chromatographys dislocation also can occur.Therefore need carry out the adjustment of six-freedom degree to each piece LCD, need the adjustment of 18 degree of freedom altogether.
For above-mentioned 18 degree of freedom are adjusted, the general now following steps that adopt:
1), a LCD (monochrome) is carried out projection, observes the sharpness at projection screen epigraph center earlier, adjust the focusing position of this piece LCD;
2) observe the sharpness on image four limits, respectively, adjust the inclination of LCD;
3), the inclination situation of observing image level and perpendicular line, adjust the sense of rotation of LCD;
4), other two LCD are carried out same adjustment;
5), three LCD (redgreenblue) projection simultaneously, adjust the relative position of three LCD, make chromatography correct.
In the whole adjustment process, need debugging person that enough experiences are arranged, labour intensity is very big, adjust precision and depend on debugging person's subjectivity to a great extent, and it is very slow to regulate the speed.This adjustment method obviously can not adapt to the needs of large-scale production.
Summary of the invention
The purpose of this invention is to provide a kind of optical projection system object plane method of adjustment and device based on defocus depth analysis.
Optical projection system object plane method of adjustment based on defocus depth analysis is: a plurality of ccd image acquisition components are installed to obtain image on the projection screen of projection optical system, by analysis to image, obtain the relative position deviation of defocusing amount, horizontal direction tilt quantity, vertical direction tilt quantity, rotation amount and three LCD of optical projection system object plane LCD, provide the adjustment parameter.
Optical projection system object plane adjusting gear based on defocus depth analysis has lighting source successively, illumination and beam splitting system, red, blue, green LCD and adjustment structure, synthetic and the projection imaging system of optics, the projection screen of a plurality of CCD is housed, the structure of each group ccd image collection group is on the projection screen: frosted glass is installed in the projection screen position, a camera lens is installed thereafter, the rear of camera lens is equipped with the CCD device, frosted glass and CCD face are gripped altogether about camera lens respectively, make picture on the projection screen after the frosted glass diffusion, dwindle through lens and to image in the CCD surface, the frosted glass trim ring, trim ring before the projection screen, trim ring and adjustment adapter ring are used for fixing frosted glass behind the projection screen, camera lens and CCD device, adapter ring rotates to be adjusted, make frosted glass very clearly image in the CCD device surface, press closer screw and be used for fixing each trim ring and adapter ring.
Advantage of the present invention:
1), adjust accuracy height (comprising that focusing, chromatography, accent tilt, transfer rotation etc.), be not subjected to the influence of operating personnel's subjective factor, precision all has control system to guarantee;
2), regulate the speed soon, the adjustment amount of 18 degree of freedom is all disposable to be provided, and is fit to the large-scale production needs;
3), simple to operate, the operator does not need a lot of experiences.
Description of drawings
Fig. 1 is based on the optical projection system object plane adjusting gear structural representation of defocus depth analysis;
Fig. 2 is based in the optical projection system object plane adjusting gear of defocus depth analysis the projection screen CCD installation site distribution plan of enameling;
Fig. 3 is based in the optical projection system object plane adjusting gear of defocus depth analysis ccd image collection group structural representation on the projection screen;
Fig. 4 is based in the optical projection system object plane adjusting gear of defocus depth analysis debugging with a unit of standard picture, and A is the unit of debugging with standard picture among the figure, and B is the red component pattern, and C is the green component pattern, and D is the blue component pattern.
Embodiment
Optical projection system object plane method of adjustment based on defocus depth analysis, it is characterized in that: a plurality of ccd image acquisition components are installed on the projection screen of projection optical system to obtain image, by analysis to image, obtain the relative position deviation of defocusing amount, horizontal direction tilt quantity, vertical direction tilt quantity, rotation amount and three LCD of optical projection system object plane LCD, provide the adjustment parameter.
Said ccd image acquisition component is: frosted glass is installed in the projection screen position, an imaging lens is installed thereafter, and the rear of camera lens is equipped with the CCD device, and frosted glass and CCD face are gripped altogether about camera lens respectively, make picture on the projection screen after the frosted glass diffusion, dwindle imaging in the CCD surface through lens.
The defocusing amount that obtains optical projection system object plane LCD by the analysis to image is with the out of focus depth method multiple image to be calculated, and draws the defocusing amount of image, thereby obtains the defocusing amount of object plane LCD.Each divides the disc of confusion size of chromatic graph to calculate each width of cloth image respectively with the out of focus depth method, again in conjunction with the optical parametric of projection optical system, calculates the defocusing amount of each color separated image, thereby calculates the axial bias of a corresponding LCD correspondence position.By calculating, can determine the three degree of freedom of each LCD: along optical axis direction defocusing amount, axial two amount of deflections of vertical light to each color separated image.
So-called out of focus depth method, can be summarized as follows: the used standard picture of this patent is the colored lines of many pure colors, the image that CCD obtains when correct of focusing can be thought step function on mathematics, system's output obtains the straight flange response, and the derivative of straight flange response is exactly the line spread function of system.Utilize this relation, can respond the size that estimates disc of confusion by the imaging system straight flange.
According to the simple relation of geometrical optics, can obtain picture side's defocusing amount of image easily by disc of confusion R, further obtain the defocusing amount of object plane.
By the horizontal direction tilt quantity that the analysis of image is obtained optical projection system object plane LCD be: by analytical calculation to two width of cloth images that obtain by CCD2 and CCD3 of dislocation, obtain the defocusing amount that corresponding projection object plane LCD goes up two points of horizontal direction, thereby obtain the tilt quantity of LCD horizontal direction;
By the vertical direction tilt quantity that the analysis of image is obtained optical projection system object plane LCD be: by analytical calculation to two width of cloth images that obtain by CCD4 and CCD5 of vertical direction dislocation, obtain the defocusing amount that corresponding projection object plane LCD goes up two points of vertical direction, thereby obtain the tilt quantity of LCD vertical direction;
Rotation amount by the analysis of image being obtained optical projection system object plane LCD and the relative position deviation of three LCD are to utilize a cover to adjust the standard multicolour pattern of usefulness, the position relation on each color separated image by white on the theory of computation or colored lines, calculate the relative position deviation of three LCD, should be level, vertical levelness, the verticality of lines in image on the theory of computation, calculate the amount of swaying and three relative initial position departures of LCD of three LCD.
Adjustment System of the present invention comprises debugging standard picture, multichannel ccd image acquisition component, computer control system and process software composition.
At first produce one group of debugging and use standard picture, comprise color separated image, become one group of colored debugging image after synthesizing by three LCD outputs of RGB by computer control software.
This colour debugging image obtains the colored debugging of width of cloth image through the optical projection system projection of dress just on projection screen.May there be various defect errors in this image, comprising: focus unclear, image inclination or rotation, three looks not overlapping or the like.
Optical projection system object plane adjusting gear based on defocus depth analysis has lighting source according to this, illumination and beam splitting system, red, blue, green LCD and adjustment structure, synthetic and the projection imaging system of optics, the projection screen of a plurality of CCD (typical case is five groups) is housed, the structure of each group ccd image collection group is on the projection screen: frosted glass 7 is installed in projection screen 2 positions, a camera lens 4 is installed thereafter, the rear of camera lens is equipped with CCD device 5, frosted glass 7 and CCD face are gripped altogether about camera lens respectively, make picture on the projection screen after the frosted glass diffusion, dwindle imaging in the CCD surface through lens.Each piece CCD all can obtain a width of cloth coloured image, the input computing machine.Trim ring 8 and adjustment adapter ring 10 are used for fixing frosted glass, camera lens and CCD device behind frosted glass trim ring 1, the preceding trim ring 6 of projection screen, the projection screen, adapter ring rotates to be adjusted, make frosted glass very clearly image in the CCD device surface, press closer screw 9 and be used for fixing each trim ring and adapter ring.
Therefore, by the analysis to disc of confusion, svelteness degree and the relative position of several coloured image each minute chromatic graphs, can calculate the error of each direction of three LCD, 18 degree of freedom are all determined.According to the adjustment scheme that computer software provides, the operator can adjust all directions of LCD easily, and the very fast adjustment of total system is finished.Adjusting to observe does not need the too many experience in early stage of operator, adjusts precision and is guaranteed by system, not influenced by operator's subjective factor.
Fig. 1 is the chief component of optical projection system: light source, three LCD, the optics that divide lighting system, band to adjust structure synthesize and projection imaging system, projection display screen.
Fig. 2 is the projection screen CCD installation site distribution plan of enameling.As exemplary, lay five CCD on the projection screen, be installed on (CCD3), top middle (CCD4) and following middle (CCD5) in the middle of center (CCD1), the left side middle (CCD2), the right respectively.
Fig. 3 is the structure of each group ccd image collection group.Frosted glass 7 is installed in projection screen 2 positions, and a camera lens 4 is installed thereafter, and the rear of camera lens is equipped with CCD device 5, and frosted glass 7 and CCD face are gripped altogether about camera lens respectively, makes picture on the projection screen after the frosted glass diffusion, dwindles imaging in the CCD surface through lens.Trim ring 8 and adjustment adapter ring 10 are used for fixing frosted glass, camera lens and CCD device behind frosted glass trim ring 1, the preceding trim ring 6 of projection screen, the projection screen, and adapter ring can rotate adjustment, so that make frosted glass very clearly image in the CCD device surface.Pressing closer screw 9 is used for fixing.Few
Fig. 4 for a kind of debugging of form with a unit of standard picture (complete pattern is the Multiple Cycle of accompanying drawing 4, and each the piece CCD that installs on the assurance projection screen all can collect complete one more than the unit).Fig. 4 R is the red component pattern of standard picture, and Fig. 4 G is the green component pattern, and Fig. 4 B is the blue component pattern.Among the figure:
Expression is red,
Expression is green,
Expression is blue,
Expression yellow (the red green that adds),
Expression cyan (the green blueness that adds),
Expression magenta (the red blueness that adds),
Expression white (red add the green blueness that adds), " blank " expression black.Debugging can be a various ways with pattern, and this figure only is a kind of canonical form.
Claims (7)
1. optical projection system object plane method of adjustment based on defocus depth analysis, it is characterized in that: a plurality of ccd image acquisition components are installed on the projection screen of projection optical system to obtain image, by analysis to image, obtain the relative position deviation of defocusing amount, horizontal direction tilt quantity, vertical direction tilt quantity, rotation amount and three LCD of optical projection system object plane LCD, provide the adjustment parameter.
2. a kind of optical projection system object plane method of adjustment according to claim 1 based on defocus depth analysis, it is characterized in that said ccd image acquisition component is: frosted glass is installed in the projection screen position, an imaging lens is installed thereafter, the rear of camera lens is equipped with the CCD device, frosted glass and CCD face are gripped altogether about camera lens respectively, make picture on the projection screen after the frosted glass diffusion, dwindle imaging in the CCD surface through lens.
3. a kind of optical projection system object plane method of adjustment according to claim 1 based on defocus depth analysis, it is characterized in that: said defocusing amount by the analysis of image being obtained optical projection system object plane LCD is with the out of focus depth method multiple image to be calculated, draw the defocusing amount of image, thereby obtain the defocusing amount of object plane LCD.
4. a kind of optical projection system object plane method of adjustment according to claim 1 based on defocus depth analysis, it is characterized in that: saidly be: by analytical calculation two width of cloth images of dislocation by the horizontal direction tilt quantity that the analysis of image is obtained optical projection system object plane LCD, obtain the defocusing amount that corresponding projection object plane LCD goes up two points of horizontal direction, thereby obtain the tilt quantity of LCD horizontal direction.
5. a kind of optical projection system object plane method of adjustment according to claim 1 based on defocus depth analysis, it is characterized in that: saidly be: by analytical calculation two width of cloth images of vertical direction dislocation by the vertical direction tilt quantity that the analysis of image is obtained optical projection system object plane LCD, obtain the defocusing amount that corresponding projection object plane LCD goes up two points of vertical direction, thereby obtain the tilt quantity of LCD vertical direction.
6. a kind of optical projection system object plane method of adjustment according to claim 1 based on defocus depth analysis, it is characterized in that: said by the analysis of image being obtained optical projection system object plane LCD rotation amount and the relative position deviation of three LCD be to utilize a cover to adjust the standard multicolour pattern of usefulness, the position relation on each color separated image by white on the theory of computation or colored lines, calculate the relative position deviation of three LCD, should be level on the theory of computation, the levelness of vertical lines in image, verticality calculates the amount of swaying and three relative initial position departures of LCD of three LCD.
7. optical projection system object plane adjusting gear based on defocus depth analysis, it is characterized in that: it has lighting source according to this, illumination and beam splitting system, red, blue, green LCD and adjustment structure, synthetic and the projection imaging system of optics, the projection screen of a plurality of CCD is housed, the structure of each group ccd image collection group is on the projection screen: frosted glass 7 is installed in projection screen 2 positions, a camera lens 4 is installed thereafter, the rear of camera lens is equipped with CCD device 5, frosted glass 7 and CCD face are gripped altogether about camera lens respectively, make picture on the projection screen after the frosted glass diffusion, dwindle through lens and to image in the CCD surface, frosted glass trim ring 1, trim ring 6 before the projection screen, trim ring 8 and adjustment adapter ring 10 are used for fixing frosted glass behind the projection screen, camera lens and CCD device, adapter ring rotates to be adjusted, make frosted glass very clearly image in the CCD device surface, press closer screw 9 and be used for fixing each trim ring and adapter ring.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106686362A (en) * | 2017-03-13 | 2017-05-17 | 安徽师范大学 | Horizontal correcting device for projected image |
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| CN103307971B (en) * | 2012-03-14 | 2018-07-06 | 鸿富锦精密工业（深圳）有限公司 | The image measurer of Optical devices and the application Optical devices |
| CN102932593B (en) * | 2012-10-10 | 2015-04-22 | 深圳市航盛电子股份有限公司 | Method and system for automatic centering of camera |
| CN104990689B (en) * | 2015-06-09 | 2017-11-10 | 青岛海信移动通信技术股份有限公司 | Localization method and device in a kind of optic test |
| CN107613183A (en) * | 2017-11-03 | 2018-01-19 | 成都野望数码科技有限公司 | A kind of application process of camera system and camera system |
| CN110736424B (en) * | 2018-07-19 | 2021-06-18 | 宁波舜宇光电信息有限公司 | Calibration method of structured light projection module group equipment and projection module group measurement method |
| CN110108230B (en) * | 2019-05-06 | 2021-04-16 | 南京理工大学 | Binary grating projection defocus degree evaluation method based on image difference and LM iteration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106686362A (en) * | 2017-03-13 | 2017-05-17 | 安徽师范大学 | Horizontal correcting device for projected image |
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Assignee: Hangzhou Zhida Electro-Optical Co.,Ltd. Assignor: Zhejiang University Contract fulfillment period: 2008.10.7 to 2013.10.6 contract change Contract record no.: 2008330000992 Denomination of invention: Object plane adjustment method of optical projection system based on defocus depth analysis and its device Granted publication date: 20060208 License type: Exclusive license Record date: 20081013 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.10.7 TO 2013.10.6; CHANGE OF CONTRACT Name of requester: HANGZHOU ZHIDA PHOTOELECTRIC CO., LTD. Effective date: 20081013 |