CN205942168U

CN205942168U - Liquid crystal glazing attachment polarization contrast identification system

Info

Publication number: CN205942168U
Application number: CN201620910731.4U
Authority: CN
Inventors: 孙淑英
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-08-22
Filing date: 2016-08-22
Publication date: 2017-02-08
Anticipated expiration: 2026-08-22

Abstract

The utility model discloses a liquid crystal glazing attachment polarization contrast identification system, including camera, the machine of lighting a lamp, backlight, second polarization board, first polarization board, first polarization board is placed to the backlight top, second polarization board is placed to first polarization board top, the camera is placed to second polarization board top, camera lens sensing in the second polarization board of camera, the backlight is including back of the body luminous face, the back of the body luminous face to first polarization board, being examined article and placing between second polarization board, first polarization board, its electric signal interface is connected to the machine of lighting a lamp, second polarization board the polarization direction is the arbitrary angle degree except that 0 or 90 with first polarization board the polarization direction's the polarization direction contained angle. The advantage: avoid its inside because there is not the link that need continue to optimize the adjustment and drift about with adaptation production line product features parameter in the formation of image of all kinds of of different nature defect points of functional damage and microstructure abnormal formation mistake, after the installation targets in place, need not later stage follow -up adjustment, the robustness is high.

Description

A kind of liquid-crystalline glasses attachment polarization contrast's identifying system

Technical field

This utility model belongs to technical field of machine vision, is related to a kind of liquid-crystalline glasses attachment polarization contrast identification system System.

Background technology

The Machine Vision Inspecting System of currently displaying screen production line, is required for independent to the small attachment on tested product surface Imaging, to exclude its impact to normal machine vision detection result.

Existing various similar imaging identifying system, in the face of similar to glass chip etc., transparent and interface direction is single Surface attachments when, there is a problem of reliably being imaged；Occurring inside tested product due to functional damage and micro- When seeing all kinds of defect point of different nature that textural anomaly is formed, easily obscure with tested product surface attachments；It is difficult to effective district Divide tested product internal flaw and surface attachments, it is unreliable that surface attachments are identified；And existing imaging mode, all needs Adjustment is continued to optimize to parameters such as light-source angles, to adapt to the drift of product of production line characteristic parameter, debugging difficulty is high, robust Property is poor.

Content of the invention

The utility model discloses a kind of liquid-crystalline glasses attachment polarization contrast's identifying system, difficult in prior art to solve Distinguish tested product internal flaw and surface attachments with effective, it is unreliable that surface attachments are identified；Debugging difficulty is high, robust Property difference the problems such as.

This utility model includes camera, lighting machine, backlight, the second polarization plates, the first polarization plates；Place above backlight First polarization plates；The second polarization plates are placed above first polarization plates；Camera is placed above second polarization plates；The camera lens of camera points to In the second polarization plates；Backlight includes backlight light-emitting area；Backlight light-emitting area is towards the first polarization plates；Tested product are placed on Between two polarization plates, the first polarization plates, its electric signal interface is connected to lighting machine；The polarization side of the second polarization plates and the first polarization The polarization direction angle β of the polarization direction of plate, is arbitrarily angled in addition to 0 ° or 90 °.

This utility model the second polarization plates polarization direction can with the angle β corresponding state value β 1 of the first polarization plates polarization side With equal to β 2.

Second polarization plates polarization direction can be+45 ° with the polarization direction angle of the first polarization plates polarization direction；Second is inclined Vibration plate polarization direction can be -45 ° with the polarization direction angle of the first polarization plates polarization direction.

Work process is as follows：

Step 1, lights backlight, for the first time the polarization direction of the polarization direction of adjustment the second polarization plates and the first polarization plates Polarization direction angle β be equal to β 1；Lighting machine is not added with to tested product driving the signal of telecommunication；Using camera, tested product are taken pictures, obtain Image 1；Lighting machine adds the driving signal of telecommunication to tested product, using camera, tested product is taken pictures, and obtains image 2；

Step 2, lights backlight, adjusts the polarization direction 4a of the second polarization plates and the polarization side of the first polarization plates second To polarization direction angle β be equal to β 2；Lighting machine is not added with to tested product driving the signal of telecommunication, using camera, tested product is taken pictures, obtains To image 3；Lighting machine adds the driving signal of telecommunication to tested product.Using camera, tested product are taken pictures, obtain image 4；

Step 3, is calculated using known Image Change Detection algorithm；Image 1 with the change point binary picture of image 3 is Image 5；Image 2 is image 6 with the change point binary picture of image 4；By image 5, corresponding point do logical AND one by one with image 6 again Computing, the new images of generation are exactly the binary image of tested product surface attachments position point.

Especially, adjust the polarization side of the polarization direction of the second polarization plates and the polarization direction of the first polarization plates when first time It is equal to the polarization direction 4a of second adjustment the second polarization plates and the polarization direction of the polarization direction of the first polarization plates to angle β 1 During angle β 2, this new work process is：

Step 1, lights backlight.Adjust the polarization direction of the second polarization plates polarization direction and the first polarization plates polarization direction Angle is equal to β 1；Lighting machine is not added with to tested product driving the signal of telecommunication, using camera, tested product is taken pictures, obtains image 1；Lighting machine The driving signal of telecommunication is added to tested product, using camera, tested product is taken pictures, obtain image 2；

Step 2, is calculated using known image threshold detection algorithm；Image 1 is with respect to the change point binaryzation of background Figure is image 3；Image 2 is image 4 with respect to the change point binary picture of background；By image 3, corresponding point are done one by one with image 4 again Logic and operation, the new images of generation are exactly the binary image of tested product surface attachments position point.

This utility model utilizes the attachment on polarizing light irradiation tested product surface, and during defect point within tested product, There is the difference of Optical symmetry, realize just for the imaging identification in tested product surface attachments；On the one hand, in polarized light When irradiating tested product surface attachments；The polarization state change of emergent ray, depending on the irregular interface on attachment surface.And be situated between The scrambling in face determines the unsymmetry of emergent ray polarization state；On the other hand, when same polarizing light irradiation is tested During various defect within product.The polarization state of emergent ray depends on the point-symmetric optical property of defect；And optical property is right Title property determines the symmetry of emergent ray polarization state；The processing mode that make use of difference to offset, makes symmetrical in polarized light Component is offset, and asymmetric component is retained；Therefore overall imaging recognition effect can highly reliably be distinguished, and produces Product internal flaw point and outside attachment；Again due to the mode of backlight source lighting, different from the mode of traditional sidelight source lighting. Light path is more direct, is not subject to setting angle, and the factor such as frame for movement affects, and luminous flux is big；After being therefore installed in place, without the later stage Follow-up adjustment.Robustness is high.

Good effect of the present utility model is：To similar to glass chip etc., the transparent and single surface in interface direction Attachment is it is also possible to reliable be imaged.And, occurring inside tested product, due to functional damage and microstructure exception shape During all kinds of defect point of different nature becoming, also will not obscure with tested product surface attachments；Can be to not pasting polarizing coating The positive and negative surface of liquid crystal panel semi-finished product on attachment imaging identification while, it is to avoid to its inside due to functional damage with And the defect point all kinds of of different nature of microstructure abnormal formation is imaged by mistake, there are not needs and continue to optimize and be adapted to give birth to The link of producing line product feature parameter drift；After being installed in place, follow up without the later stage and adjust；Robustness is high.

Brief description

Fig. 1 is this utility model structural front view；

Fig. 2 is this utility model structure top view；

In figure：1 camera, 1a camera lens, 2 lighting machines, 3 backlights, 3a backlight light-emitting area, 4 second polarization plates, 4a second Polarization plates polarization direction, 5 first polarization plates, 5a the first polarization plates polarization direction, β polarization direction angle, 6 tested product.

Specific embodiment

Describe an embodiment of the present utility model below in conjunction with accompanying drawing in detail.

This utility model embodiment as shown in Figure 1 and Figure 2, including camera 1, lighting machine 2, backlight 3, the second polarization plates 4, First polarization plates 5；The first polarization plates 5 are placed in backlight 3 top；The second polarization plates 4 are placed in first polarization plates 5 top；Second is inclined Camera 1 is placed in vibration plate 4 top；The camera lens 1a of camera 1 is directed to the second polarization plates 4；Backlight 3 includes backlight light-emitting area 3a； Backlight light-emitting area 3a is towards the first polarization plates 5；Tested product 6 are placed between the second polarization plates 4, the first polarization plates 5, its telecommunications Number interface is connected to lighting machine 2；The second polarization plates polarization direction 4a and polarization direction angle β of the first polarization plates polarization direction 5a It is arbitrarily angled in addition to 0 ° or 90 °；Second polarization plates polarization direction 4a and the polarization side of the first polarization plates polarization direction 5a + 45 ° or -45 ° can be adjusted to angle β；Can also the second polarization plates polarization direction 4a and the first polarization plates polarization direction 5a Identical.

The polarization direction angle β of the second polarization plates polarization direction 4a and the first polarization plates polarization direction 5a can be adjusted to+ When 45 ° or -45 °, work process is as follows：

Step 1, lights backlight, for the first time adjustment the second polarization plates polarization direction 4a and the first polarization plates polarization direction 5a Polarization direction angle β be equal to+45 °；Lighting machine is not added with to tested product driving the signal of telecommunication；Using camera, tested product are taken pictures, obtain To image 1；Lighting machine adds the driving signal of telecommunication to tested product, using camera, tested product is taken pictures, and obtains image 2；

Step 2, lights backlight；Second adjustment the second polarization plates polarization direction 4a and the first polarization plates polarization direction 5a Polarization direction angle β be equal to -45 °；Lighting machine is not added with to tested product driving the signal of telecommunication, using camera, tested product is taken pictures, obtains To image 3；Lighting machine adds the driving signal of telecommunication to tested product.Using camera, tested product are taken pictures, obtain image 4；

Especially, adjust the polarization side of the second polarization plates polarization direction 4a and the first polarization plates polarization direction 5a when first time To angle, the polarization direction folder equal to second adjustment the second polarization plates polarization direction 4a and the first polarization plates polarization direction 5a Angle, during equal to+45 °, this new work process is：

Step 1, lights backlight.Adjust the second polarization plates polarization direction 4a and the polarization of the first polarization plates polarization direction 5a Angular separation β is equal to+45 °；Lighting machine is not added with to tested product driving the signal of telecommunication, using camera, tested product is taken pictures, obtains image 1；Lighting machine adds the driving signal of telecommunication to tested product, using camera, tested product is taken pictures, and obtains image 2；

Claims

1. a kind of liquid-crystalline glasses attachment polarization contrast's identifying system；It is characterized in that：Including camera, lighting machine, backlight, Two polarization plates, the first polarization plates；The first polarization plates are placed above backlight；The second polarization plates are placed above first polarization plates；The Camera is placed above two polarization plates；The camera lens of camera is directed to the second polarization plates；Backlight includes backlight light-emitting area；Backlight Light-emitting area is towards the first polarization plates；Tested product are placed between the second polarization plates, the first polarization plates, and its electric signal interface is connected to Lighting machine；Second polarization plates polarization direction is in addition to 0 ° or 90 ° with the polarization direction angle of the first polarization plates polarization direction Arbitrarily angled.

2. a kind of liquid-crystalline glasses attachment polarization contrast's identifying system according to claim 1；It is characterized in that：Second is inclined Vibration plate polarization direction can be equal to β 2 with the angle β corresponding state value β 1 of the first polarization plates polarization direction.