CN103905762B - Method for automatically detecting projection picture for projection module - Google Patents

Method for automatically detecting projection picture for projection module Download PDF

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Publication number
CN103905762B
CN103905762B CN201410146507.8A CN201410146507A CN103905762B CN 103905762 B CN103905762 B CN 103905762B CN 201410146507 A CN201410146507 A CN 201410146507A CN 103905762 B CN103905762 B CN 103905762B
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China
Prior art keywords
projection
image
resolution chart
chart picture
projection module
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CN201410146507.8A
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Chinese (zh)
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CN103905762A (en
Inventor
赵天君
朱亚军
朱亚敏
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上海索广电子有限公司
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Publication of CN103905762A publication Critical patent/CN103905762A/en
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Abstract

The invention relates to a method for automatically detecting a projection picture for a projection module. The method for automatically detecting the projection picture is characterized by comprising the steps that a focusing control rod of a projection module is connected with an electric cylinder, and the focusing control rod is located at an initial position; an image resolution value is calculated; according to the change of the image resolution value, the position of the focusing control rod is controlled; finally, defect detection comprising detection of point-shaped foreign matter, detection of bar-shaped foreign matter and ghost detection is conducted. By the adoption of the method for automatically detecting the projection picture for the projection module, the precision of focusing control of a video device is improved, detection of projection defects is automatically achieved, and labor cost of the station for detection of the projection defects is reduced at the same time.

Description

The projected picture automatic check method of projection module

Technical field

The present invention relates to a kind for the treatment of technology of the adjust automatically lens articulation based on image processing techniquess, and according to throwing Shadow image judges whether its quality meets the requirements, it is adaptable to which the high accuracy adjustment of projection video checks application.

Background technology

At present, the focus adjustment bar on constantly regulation PICO projection modules is needed manually to come right in projection adjustment engineering Projected image is focused, is obtained most clearly after image, then judged by the picture quality manually to focusing on, then Different order control PICO projection modules are sent by program and is projected out different images, last resort is manually to color, ash The quality of the pictures such as point, ghost is judged.

The content of the invention

It is an object of the invention to provide a kind of method that automatic inspection can be carried out to the projected picture of projection module.

In order to achieve the above object, the technical scheme is that and examined automatically there is provided a kind of projected picture of projection module Checking method, it is characterised in that step is:

Step 1, the relation curve that focus adjustment bar position and projection definition are obtained by test;

Step 2, the focus adjustment bar of projection module is connected with electric cylinders, focus adjustment bar is located at initial position;

Step 3, by projection module projection obtain resolution chart picture;

Step 4, current resolution chart picture is carried out gray processing process, homogenization operation, by original resolution chart picture It is converted into that the data analysiss image of Data Analysis Services state can be carried out, obtains the zone line of data analysiss image, calculates Obtain the definition values of current data analysis image zone line;

Step 5, electric cylinders are further to set step-length step, and by projection module projection next width resolution chart picture is obtained;

Step 6, next width resolution chart picture is carried out gray processing process, homogenization operation, by original resolution chart picture It is converted into that next width data analysiss image of Data Analysis Services state can be carried out, in obtaining next width data analysiss image Between region, be calculated the definition values of next width data analysiss image zone line;

Step 7, by the definition values of next width data analysiss image zone line and current data analysis image mesozone The definition values in domain compare, and the relation curve obtained according to step 1 sets the steering of electric cylinders so as to adjust focus adjustment bar Position;

Step 8, return to step 3 are re-executed, until the definition values of data analysiss image zone line become from small to large Diminish again after change;

Step 9, by electric cylinders current location adjust back a step, by projection module projection obtain resolution chart picture, to current Resolution chart picture carries out gray processing process, homogenization operation, and original resolution chart picture is converted into carry out data analysiss The data analysiss image of process state, obtains four angular regions of data analysiss image, and four angular regions are calculated respectively Definition values, it is compared with the qualified threshold value of respective regions set in advance, if exceeding or falling below qualified threshold value, is returned Step 2 is re-executed, otherwise, into step 10;

Step 10, defect inspection, including point-like inspection of foreign substance, strip inspection of foreign substance or ghost inspection:

Point-like inspection of foreign substance:Obtaining resolution chart picture to projection module projection first carries out gray processing process, then to ash Degree image carries out angle point calculating, and calculates the gray value around angle point according to the coordinate of angle point, if angle point is compared with gray scale around Low, there is point-like foreign body in identification, otherwise, then it is assumed that there is bright spot;

Strip inspection of foreign substance:Obtaining resolution chart picture to projection module projection carries out gray processing process, then to gray-scale maps As carrying out rim detection, and determined whether to scratch according to the edge for detecting;

Ghost is checked:Standard definition image is divided into into different regions, each region is according to its brightness and color The threshold value of different set R, G, B component and brightness value, during inspection, according to projection module projection each pixel in resolution chart picture is obtained The coordinate of point finds its corresponding region, then the R of each pixel, G, B component and brightness value are carried out with the threshold value being previously set Relatively, if the value that the same area has multiple pixels exceeds or falls below threshold value, it is determined that ghost.

Present invention contrast artificial judgment has following beneficial effect:The tune that equipment camera lens can be completed of the invention fast accurate Jiaozhuo industry.For the theoretical value of the image sampling frame number of dynamic video image can reach 15 frames/second, step motion control precision reaches 0.2mm, meanwhile, focusing definition concordance is high, and (easily producing error due to manually comparing same width picture for a long time) exists Follow-up machine is used as benchmark.By the present invention, the precision of video equipment focusing adjustment is improve, be automatically obtained projection and lack Sunken inspection, while reducing the human cost of the station.

Description of the drawings

Fig. 1 is the relation curve of the adjusting lever position of the projection module used in embodiment and projection definition.

Specific embodiment

To become apparent the present invention, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.

The invention provides a kind of projected picture automatic check method of projection module, in the present embodiment, projection module is PICO projection modules, electric cylinders adopt SMC electric cylinders, and as 0.2mm, its step is the step-length that SMC electric cylinders set:

Step 1, the relation curve that focus adjustment bar position and projection definition are obtained by multigroup test, in the present embodiment In the relation curve as shown in figure 1, wherein focus adjustment bar high order end is used as original position, be set as X-axis, unit is mm, clearly Clear degree is set as Y-axis, and focus adjustment bar is moved from left to right, definition be one from obscuring to clear, then from clearly to fuzzy Process, most clearly projected image is obtained by the movement of focus adjustment bar.

Step 2, the focus adjustment bar of projection module is connected with electric cylinders, focus adjustment bar is located at initial position.

Step 3, by projection module projection obtain resolution chart picture.

Step 4, current resolution chart picture is carried out gray processing process, homogenization operation, by original resolution chart picture It is converted into that the data analysiss image of Data Analysis Services state can be carried out, in the present embodiment data analysiss image is carried out into 9 Region division, 9 regions include center zone line and the folding corner region positioned at four corners of image, can count respectively Calculate the definition in all 9 regions, it is also possible to calculate the definition of zone line and four folding corner regions, it is also possible in only calculating Between region definition;

Step 5, electric cylinders are further to set step-length step, i.e., the step-length that in the present embodiment SMC electric cylinders set as 0.2mm, Next width resolution chart picture is obtained by projection module projection;

Step 6, employing and step 4 identical method carry out gray processing process, homogenization behaviour to next width resolution chart picture Make, original resolution chart picture is converted into carry out next width data analysiss image of Data Analysis Services state, under One width data analysiss image carries out 9 region divisions, and the definition in all 9 regions of next width data is calculated respectively, it is also possible to Calculate the definition of zone line and four folding corner regions, it is also possible to only calculate the definition of zone line;

Step 7, by the middle of the definition values and current data analysis image of the zone line of next width data analysiss image The definition values in region compare, and the relation curve obtained according to step 1 sets the steering of electric cylinders so as to adjust focus adjustment bar Position;

Step 8, return to step 3 are re-executed, until the definition values of data analysiss image zone line become from small to large Diminish again after change, after change from large to small occur in definition values one, the circulation of step 3 to step 8 is immediately finished, into step Rapid 9;

Step 9, by electric cylinders current location adjust back a step, by projection module projection obtain resolution chart picture, to current Resolution chart picture carries out gray processing process, homogenization operation, and original resolution chart picture is converted into carry out data analysiss The data analysiss image of process state, obtains four angular regions of data analysiss image, and four angular regions are calculated respectively Definition values, it is compared with the qualified threshold value of respective regions set in advance, if exceeding or falling below qualified threshold value, is returned Step 2 is re-executed, otherwise, into step 10;

Step 10, defect inspection, including point-like inspection of foreign substance, strip inspection of foreign substance or ghost inspection:

Point-like inspection of foreign substance:Obtaining resolution chart picture to projection module projection first carries out gray processing process, then to ash Degree image carries out angle point calculating, and calculates the gray value around angle point according to the coordinate of angle point, if angle point is compared with gray scale around Low, there is point-like foreign body in identification, otherwise, then it is assumed that there is bright spot;

Strip inspection of foreign substance:Obtaining resolution chart picture to projection module projection carries out gray processing process, then to gray-scale maps As carrying out rim detection, and determined whether to scratch according to the edge for detecting;

Ghost is checked:Standard definition image is divided into into different regions, each region is according to its brightness and color The threshold value of different set R, G, B component and brightness value, during inspection, according to projection module projection each pixel in resolution chart picture is obtained The coordinate of point finds its corresponding region, then the R of each pixel, G, B component and brightness value are carried out with the threshold value being previously set Relatively, if the value that the same area has multiple pixels exceeds or falls below threshold value, it is determined that ghost.

Claims (1)

1. the projected picture automatic check method of a kind of projection module, it is characterised in that step is:
Step 1, the relation curve that focus adjustment bar position and projection definition are obtained by test;
Step 2, the focus adjustment bar of projection module is connected with electric cylinders, focus adjustment bar is located at initial position;
Step 3, by projection module projection obtain resolution chart picture;
Step 4, gray processing process, homogenization operation are carried out to current resolution chart picture, current resolution chart picture is changed Into the data analysiss image that can carry out Data Analysis Services state, the zone line of data analysiss image is obtained, be calculated The definition values of current data analysis image zone line;
Step 5, electric cylinders are further to set step-length step, and by projection module projection next width resolution chart picture is obtained;
Step 6, next width resolution chart picture is carried out gray processing process, homogenization operation, by next width resolution chart picture conversion Into the next width data analysiss image that can carry out Data Analysis Services state, the mesozone of next width data analysiss image is obtained Domain, is calculated the definition values of next width data analysiss image zone line;
Step 7, by the definition values of next width data analysiss image zone line and current data analysis image zone line Definition values compare, and the relation curve obtained according to step 1 sets the steering of electric cylinders so as to adjust the position of focus adjustment bar;
Step 8, return to step 3 are re-executed, after the definition values of data analysiss image zone line change from small to large Diminish again;
Step 9, electric cylinders are adjusted back into a step in current location, resolution chart picture is obtained by projection module projection, to current clear Degree image carries out gray processing process, homogenization operation, and original resolution chart picture is converted into carry out Data Analysis Services The data analysiss image of state, obtains four angular regions of data analysiss image, and respectively four angular regions of calculating is clear Angle value, it is compared with the qualified threshold value of respective regions set in advance, if exceeding or falling below qualified threshold value, return to step 2 re-execute, otherwise, into step 10;
Step 10, defect inspection, including point-like inspection of foreign substance, strip inspection of foreign substance or ghost inspection:
Point-like inspection of foreign substance:Obtaining resolution chart picture to projection module projection first carries out gray processing process, then to gray-scale maps As carrying out angle point calculating, and the gray value around angle point is calculated according to the coordinate of angle point, if angle point is low compared with gray scale around There is point-like foreign body in identification, otherwise, then it is assumed that there is bright spot;
Strip inspection of foreign substance:Obtaining resolution chart picture to projection module projection carries out gray processing process, and then gray level image is entered Row rim detection, and determined whether to scratch according to the edge for detecting;
Ghost is checked:Standard definition image is divided into into different regions, each region is according to its brightness and the difference of color The threshold value of setting R, G, B component and brightness value, during inspection, according to projection module projection resolution chart each pixel as in is obtained Coordinate finds its corresponding region, then the R of each pixel, G, B component and brightness value are compared with the threshold value being previously set, If the value that the same area has multiple pixels exceeds or falls below threshold value, it is determined that ghost.
CN201410146507.8A 2014-04-14 2014-04-14 Method for automatically detecting projection picture for projection module CN103905762B (en)

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Publication number Priority date Publication date Assignee Title
CN107942474A (en) * 2017-12-11 2018-04-20 成都市极米科技有限公司 Focusing method, device and projector equipment

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CN1065341A (en) * 1991-02-19 1992-10-14 利诺泰普-赫尔有限公司 The focus adjustment method of optical image system and device
CN102375316A (en) * 2010-08-27 2012-03-14 鸿富锦精密工业(深圳)有限公司 Projector and automatic focusing method thereof
CN102749183A (en) * 2012-05-25 2012-10-24 苏州佳世达光电有限公司 System, method and device for detecting projection picture of projector

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US7517089B2 (en) * 2004-03-29 2009-04-14 Seiko Epson Corporation Image processing system, projector, information storage medium, and image processing method
JP3888465B2 (en) * 2004-05-26 2007-03-07 セイコーエプソン株式会社 Image processing system, projector, and image processing method
JP2012027263A (en) * 2010-07-23 2012-02-09 Sony Corp Imaging apparatus, control method and program thereof

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1065341A (en) * 1991-02-19 1992-10-14 利诺泰普-赫尔有限公司 The focus adjustment method of optical image system and device
CN102375316A (en) * 2010-08-27 2012-03-14 鸿富锦精密工业(深圳)有限公司 Projector and automatic focusing method thereof
CN102749183A (en) * 2012-05-25 2012-10-24 苏州佳世达光电有限公司 System, method and device for detecting projection picture of projector

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