CN104091557B - A kind of display screen based on image recognition technology test device and method of testing thereof - Google Patents
A kind of display screen based on image recognition technology test device and method of testing thereof Download PDFInfo
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Abstract
The invention discloses a kind of display screen based on image recognition technology test device and method of testing, comprise test main frame, test main frame external connection photographic head, camera bracket, display, include PXI computer inside test main frame, in PXI computer, be provided with camera module, image output module, image processing module.The present invention can substitute human eye and directly see screen artificial judgement ground method of testing, too much interference from human factor is avoided to test, modernization automatic test technology is used to realize test, can improve testing efficiency simultaneously effective to reduce test and make mistakes probability, the judgement also making test result is the most more standardized.
Description
Technical field
We are bright relates to Avionic Products automatic test technology field, particularly to a kind of display screen test dress
Put and method of testing.
Background technology
In the technical field of measurement and test of Avionic Products, generally use test man directly to see display screen, artificially sentence
Disconnected display information is the most correct, or is manually entered to enter as the input of test information according to display information
Row test, more by artificial influence factors, automaticity is relatively low.
Summary of the invention
For the deficiencies in the prior art, the goal of the invention of the present invention is to provide a kind of based on image recognition technology
Display screen test device, display information is identified automatically and judges or utilize display information to carry out
Automatically test.
The goal of the invention of the present invention is achieved through the following technical solutions:
A kind of display screen based on image recognition technology test device, comprises test main frame, described test main frame
External connection photographic head, camera bracket, display, include PXI computer, PXI inside test main frame
Camera module, image output module, image processing module it is provided with in computer；
Described photographic head is for capturing image and the auto-focusing of tested display screen；
Described camera bracket is used for making photographic head move up and down and folding retractable；
Described display instructs for the test accepting user's input and shows test result；
Described camera module is used for controlling camera bracket and moves up and down and folding retractable and control shooting
Head capture image；
Described image output module is for tested display screen output image information, as tested tested display screen display
Show the most normal then outputting standard test image；As judged, the display information then output character of tested display screen is believed
Breath；
Described image processing module comprise image comparison module, gradation processing module, binary conversion treatment module with
And eigenvalue identification module, described image comparison module is for carrying out the image of the tested display screen collected
Image comparison, tests tested display screen and displays whether normally；Described gradation processing module, binary conversion treatment mould
Block and eigenvalue identification module successively for the image of the tested display screen collected is carried out gray proces, two
Value processes and identifies the display content of tested display screen.
It is connected to test by USB or network interface main according to features described above, described photographic head and camera bracket
Machine.
According to features described above, inside described test main frame, also include that ethernet test card, RS422/RS485 test
Card, relay card and analog quantity discrete magnitude test card, each test card all uses PXI bus with PXI computer even
Connect.
According to features described above, described display screen test device also comprises test adapter, and test adapter connects
Tested display screen and test main frame, provide power supply, communication and control interface thereof for tested display screen, operate quilt
Survey display screen and realize test automatically.
Another object of the present invention is to provide a kind of display screen method of testing based on image recognition technology, bag
The display screen containing test displays whether normal method and the method for test display screen capturing information, and described test shows
Display screen displays whether that normal method comprises the steps of
A.1), pulling out high-definition camera, camera module controls camera bracket and adjusts up and down, is moved by photographic head
Move appointment position and fix；
A.2), image output module transmitting control commands adapter after tested makes tested display screen output mark after processing
Quasi-test image；
A.3), camera module control camera collection view data, be stored in data base；
A.4), image processing module goes through the store-through storage all pixels of image, single pixel and pre-stored criteria image pair
Answering pixel rgb value error to be considered same pixel at ± 20, pixel is mutually unison is more than 95%, then it is assumed that
It is same image, it is determined that display screen shows normally；
The method of described test display screen capturing information comprises the steps of
B.1), pulling out high-definition camera, camera module controls camera bracket and adjusts up and down, is moved by photographic head
Move appointment position and fix；
B.2), image output module sends after character information adapter after tested processes in tested display screen display；
B.3), camera module is caught according to the two-dimensional coordinate and Length x Width control photographic head thereof of presetting identification region
Obtain image and store；
B.4), image processing module image is made gray proces and binary conversion treatment, obtain the value of information of image.
B.5), the value of information of the image after binaryzation is carried out Character segmentation, the character after segmentation is input to spy
Value indicative identification module is identified, capturing information.
Compared with prior art, the beneficial effects of the present invention is:
At present the method for state's build-in test display screen mainly relies on and manually removes directly to estimate display screen and thinking and sentence
Disconnected test result, or rely on and gather video data and carry out the mode of comparing and realize test.Use shadow
As identifying that the solution of technical testing display screen can substitute human eye and directly see screen artificial judgement ground method of testing.
Promote the use of the method test display screen, too much interference from human factor can be avoided to test, use existing
Generationization automatic test technology realizes test, it is possible to increase testing efficiency simultaneously effective reduces test and makes mistakes probability,
Also the judgement making test result is the most more standardized.
Accompanying drawing explanation
Fig. 1 is display screen test apparatus structure schematic diagram in the present invention；
Fig. 2 is test main frame internal structure schematic diagram in the present invention；
Fig. 3 is image signal after the cutting of test figure in embodiment；
Fig. 4 is image signal after the process of cutting gradation of image in embodiment；
Fig. 5 is image signal after binary conversion treatment in embodiment；
Fig. 6 is display screen method of testing flow chart of the present invention.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings.
The invention mainly comprises test main frame 3 and test adapter 4 two parts, and respective software program,
Detailed design is described as follows.
Fig. 1 is test main frame overall structure schematic diagram, tests main frame external connection photographic head 1, camera bracket 2,
Display 6, photographic head 1 can clearly capture image and the auto-focusing of tested display screen 5, camera bracket 2
Photographic head 1 can be made to move up and down and folding retractable, and photographic head 1 and camera bracket 2 are by USB or network interface
It is connected with test main frame.User is instructed by display 6 input test and is shown test result
Fig. 2 is the internal structure schematic diagram of test main frame, includes PXI computer, PXI inside test main frame
Camera module, image output module, image processing module it is provided with in computer.
Camera module offer api interface can be called, by high-level language, the software realizing taking pictures and control, and controls
Camera bracket 2 move up and down and folding retractable and control photographic head capture image.
Image output module is to tested display screen 5 output image information.Display whether as tested tested display screen 5
Normal then outputting standard tests image, and general employing tests colour bar.As judged the display information of tested display screen 5
Then output character information, such as some monitoring information, information content includes capital and small letter English and Arabic numerals.
The image of the image processing module tested display screen 5 to collecting carries out image comparison, gray proces and two
Value processes, and tests tested display screen 5 and displays whether display content that is normal or that identify tested display screen 5.
Test main frame also include ethernet test card, RS422/RS485 test card, relay card and analog quantity from
Dissipating and measure examination card, each test card all uses PXI bus to be connected with measuring and calculation machine, is being calculated by PXI bus
Under the control of machine, testing results unit testing program, it is achieved the automatization of whole test process.Net very much test
Card connects equipment under test ethernet port, sends data to equipment under test, equipment under test by ethernet test card
Corresponding information can be shown on display screen, then read display information by display screen test device and test.Profit
Realize reception and the transmission of RS422 data with RS422/RS485 test card, these test card auxiliary display screen are surveyed
Electricity testing device completes corresponding video measurement.
Test adapter 4 can be changed according to demand, is mainly used in and tested display screen 5 (or band display screen
Product) connect, provide power supply, communication and control interface thereof for tested display screen, operate tested display screen 5 real
The most automatically test.
Display screen test device can be tested display screen and displays whether normally, to comprise method as follows as shown in Figure 6:
A.1), pulling out high-definition camera, camera module controls camera bracket and adjusts up and down, is moved by photographic head
Move appointment position and fix；
A.2), image output module by RS422 mouth (network interface or other control mouth) transmitting control commands warp
Test adapter makes tested display screen 5 outputting standard test image after processing, general employing tests colour bar.
A.3), camera module by api interface control camera collection view data, be stored in data base；
A.4), image processing module goes through the store-through storage all pixels of image, single pixel and pre-stored criteria image pair
Answering pixel rgb value error to be considered same pixel at ± 20, pixel is mutually unison is more than 95%, then it is assumed that
It is same image, it is determined that display screen shows normally.This mainly relies on the method for image comparison to survey
Examination.
Display screen test device also can determine whether to show the test of on-screen-display message as shown in Figure 6, comprises method as follows:
B.1), pulling out high-definition camera, camera module controls camera bracket and adjusts up and down, is moved by photographic head
Move appointment position and fix；
B.2), image output module is fitted after tested by RS422 mouth (or other control mouth) transmission control information
In tested display screen display after orchestration process；On tested display screen, corresponding region can show operation information, than
As some monitor information, information content includes capital and small letter English and Arabic numerals.
B.3), camera module is caught according to the two-dimensional coordinate and Length x Width control photographic head thereof of presetting identification region
Obtain image and store；Identify that region should be slightly wider than the region (as shown in Figure 3) of actual information.
B.4), image is made gray proces and binary conversion treatment by image processing module.The method of gray proces is to adopt
The gray value of each pixel, algorithmic formula f (i/j)=(R (i/j)+G (i/j)+B (i/j))/3 are tried to achieve with average algorithm
The gray value obtaining picture obtains gray-scale map (as shown in Figure 4) as output.Because identifying the information word in region
Symbol is shown on LCD screen background colour, and general background color is more single, and the rgb value of background colour is relative
Relatively.Identify that 10 pixels at gray-scale map edge, region are averaging gray value, as place so choosing
The intermediate value of reason image binaryzation.It is considered same value to take 0 when gray value is in intermediate value ± 20 (actual pixel value is
Extracting waste RGB (255,255,255)), when gray value does not takes in the range of this, (actual pixel value is for taking
Black RGB (0,0,0)), thus obtain the value of information of this image.
B.5), by Character segmentation to be carried out for image after binaryzation, the character after segmentation is input to eigenvalue identification
Module is identified, capturing information.
The test software development of the present invention uses the programmed environment of VISUAL C++6.0 and Labview 8.6, surveys
Examination software development is largely divided into 4 parts, including hardware driving exploitation, function application and development, UI framework, survey
Example exploitation on probation.Hardware driving mainly realizes photographic head control, and various boards control；Function application and development
It is to utilize various hardware to realize all kinds of related application, as utilized photographic head to realize image capture module function, figure
As comparing function, gradation of image process function etc., RS422 board is utilized to realize the reception of RS422 data and send out
Sending, ethernet test card realizes reception and the transmission etc. of Ethernet；UI framework mainly builds test software operation
Interface；Test case exploitation is mainly write various test item and is realized test automatically.
Claims (5)
1. display screen based on an image recognition technology test device, comprises test main frame, it is characterised in that
Described test main frame external connection photographic head, camera bracket, display, include PXI inside test main frame
Computer, is provided with camera module, image output module, image processing module in PXI computer；
Described photographic head is for capturing image and the auto-focusing of tested display screen；
Described camera bracket is used for making photographic head move up and down and folding retractable；
Described display instructs for the test accepting user's input and shows test result；
Described camera module is used for controlling camera bracket and moves up and down and folding retractable and control shooting
Head capture image；
Described image output module is for tested display screen output image information, as tested tested display screen display
Show the most normal then outputting standard test image；As judged, the display information then output character of tested display screen is believed
Breath；
Described image processing module comprise image comparison module, gradation processing module, binary conversion treatment module with
And eigenvalue identification module, described image comparison module is used for the image to the tested display screen collected with pre-
Deposit standard picture contrast, test tested display screen and display whether normally；Described gradation processing module, binaryzation
Processing module and eigenvalue identification module are successively for carrying out at gray scale the image of the tested display screen collected
Reason, binary conversion treatment and identify the display content of tested display screen.
A kind of display screen based on image recognition technology the most according to claim 1 test device, it is special
Levy and be that described photographic head and camera bracket are connected to test main frame by USB or network interface.
A kind of display screen based on image recognition technology the most according to claim 1 test device, it is special
Levy and be inside described test main frame also to include ethernet test card, RS422/RS485 test card, relay
Card and analog quantity discrete magnitude test card, each test card all uses PXI bus to be connected with PXI computer.
A kind of display screen based on image recognition technology the most according to claim 1 test device, it is special
Levy and be that described display screen test device also comprises test adapter, test adapter connect tested display screen with
Test main frame, provides power supply, communication and control interface thereof for tested display screen, operates tested display screen and realizes
Automatically test.
The test of a kind of display screen based on image recognition technology the most according to claim 1 test device
Method, comprises test display screen and displays whether normal method and the method for test display screen capturing information, institute
State test display screen and display whether that normal method comprises the steps of
A.1), pulling out high-definition camera, camera module controls camera bracket and adjusts up and down, by photographic head
Move to specify position and fix；
A.2), image output module transmitting control commands adapter after tested makes tested display screen export after processing
Standard testing image；
A.3), camera module control camera collection view data, be stored in data base；
A.4), image processing module goes through the store-through storage all pixels of image, single pixel and pre-stored criteria image
Corresponding pixel points rgb value error is considered same pixel at ± 20, and pixel is mutually unison is more than 95%, then
It is considered same image, it is determined that display screen shows normally；
The method of described test display screen capturing information comprises the steps of
B.1), pulling out high-definition camera, camera module controls camera bracket and adjusts up and down, by photographic head
Move to specify position and fix；
B.2), image output module sends after character information adapter after tested processes aobvious on tested display screen
Show；
B.3), camera module is according to presetting the two-dimensional coordinate identifying region and Length x Width control photographic head thereof
Capture image also stores；
B.4), image processing module image is made gray proces and binary conversion treatment, obtain the value of information of image；
B.5), the value of information of the image after binaryzation is carried out Character segmentation, the character after segmentation is input to
Eigenvalue identification module is identified, capturing information.
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| CN104330129A (en) * | 2014-10-22 | 2015-02-04 | 沈阳黎明航空发动机(集团)有限责任公司 | Aeroengine force application main pipe oil cup liquid level measuring system |
| CN108871735A (en) * | 2018-04-27 | 2018-11-23 | 上海与德科技有限公司 | Display screen shows the test fixture and its test method, host computer of quality |
| CN108416356B (en) * | 2018-05-28 | 2023-08-25 | 成都创智联云科技有限公司 | Character wheel image verification device and control method thereof |
| CN110010044A (en) * | 2019-04-02 | 2019-07-12 | 上海帆声图像科技有限公司 | It is a kind of to show the display detection method of equipment, apparatus and system |
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| AU2008261138B2 (en) * | 2008-12-19 | 2011-08-18 | Canon Kabushiki Kaisha | Measure display SFR using a camera and phase shifting |
| CN103631246B (en) * | 2012-08-20 | 2017-02-08 | 珠海格力电器股份有限公司 | Test method, test device, test tool and test system of electronic device |
| CN103067736B (en) * | 2012-12-20 | 2015-04-22 | 广州视源电子科技股份有限公司 | Automatic test system based on character recognition |
| CN103024434B (en) * | 2012-12-20 | 2014-12-24 | 广州视源电子科技股份有限公司 | Automatic test system based on image matching |
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