CN104469350B - Method for detecting TTL video signals generated by video source - Google Patents
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Abstract
The invention belongs to the fields of liquid crystal module displaying and testing, and particularly relates to a method for detecting TTL video signals generated by a video source. The method comprises the steps that firstly, the electrical characteristics of the TTL video signals are detected, and a TTL electrical detection result is output; secondly, if the TTL electrical detection result shows that the quality of the TTL video signals is up to standard, each frame of RGB data in RGB video signals are cached, then the cached RGB data are sequentially compared with original image data to be detected, and an image data detection result is output. According to the method, the TTL video signals generated by the video source can be detected, operation is easy, economy and practicality are achieved, the integration level is high, work is reliable, the anti-interference capability is high, the reliability and efficiency of detecting a TTL liquid crystal module can be improved, and the equipment cost and production cost of the TTL liquid crystal module can be lowered.
Description
Technical field
The invention belongs to display field and the field tests of liquid crystal module, be specifically related to a kind of detection video
The method of the TTL video signal that source produces.
Background technology
Liquid crystal display module (Liquid Crystal Display Module, hereinafter referred to as module) and phase thereof
The use of the liquid crystal display (hereinafter referred to as equipment) closed is the most universal, as well as TTL
(Transistor Transistor Logic, transistor-transistor logic level) signal stabilization is reliable, biography
Speed is high, power consumption is relatively low, and a lot of modules and equipment are all by using this signal as receiving video image
Display interface.
Carry out producing at module and equipment thereof, debug, videograph process time need to pass through video signal
Source or video adapting plate (being the most all called for short video source) produce TTL video signal and provide module displays to it
The source of signal, thereby, it is ensured that the video signal correctness of video source generation and reliability are to ensure module
The premise of display.
At present, market there is no unified standard for video source field and guarantee the TTL video signal of output
Correctness, reliability, to video source output picture signal detection all by human eye to shown
Image pixel identifies one by one, manually cuts figure and persistently judges.This detection mode operator are the easiest
Erroneous judgement, is difficult to localized reason place when there is display problem；And it is easily subject to by eye recognition
The subjective impact of people, operator are for a long time facing to image, and eyes are the most tired, and these all can be to detection
Result impacts；Need to again build test platform when changing module, thus cause inefficiency,
Complex operation.
It is thus desirable to a kind of technical scheme can TTL image reliable, errorless, that produce video source efficiently
Signal detects, it is not necessary to artificially judge.
Summary of the invention
The purpose of the present invention is contemplated to solve the deficiency that above-mentioned background technology exists, it is provided that a kind of detection
The method of the TTL video signal that video source produces, it has reliability height, nothing is judged by accident, simple to operate,
Detection efficiency is high, the feature of low cost.
The technical solution used in the present invention is: a kind of side detecting the TTL video signal that video source produces
Method, comprises the following steps:
Step 1, electrically detects control signal and carries out the electrical characteristic of TTL video signal according to TTL
Sampling, the electric parameter obtaining TTL video signal carries out comparison and detection with TTL electric parameter benchmark,
If the electric parameter of TTL video signal is in the range of TTL electric parameter benchmark, then TTL is electric
Detecting up to standard, otherwise TTL electrically detects the most up to standard, stops the detection of this TTL video signal；
Step 2, if TTL electrically detects up to standard, then produces view data detection control signal, starts to depend on
Every frame RGB data in secondary caching described TTL video signal；Produce original image and read control signal,
Start to cache raw image data, then will delay according to original image horizontal resolution, vertical resolution
The every frame RGB data kept carries out comparison and detection successively with described raw image data, exports picture number
According to testing result, the object of described detection includes each pixel size and the location of pixels of RGB data.
Further, in described step 1 before the electrical characteristic of TTL video signal is sampled,
First according to the characteristic of TTL video signal, receive TTL electric parameter benchmark and TTL transmission coupling ginseng
Number；Receive raw image data；Original image horizontal resolution, vertical resolution are set；Output TTL
Transmission match parameter and TTL electric parameter benchmark, produce described TTL and electrically detect control signal.
Further, in described step 1 before the electrical characteristic of TTL video signal is sampled,
The TTL video signal first produced video source according to TTL transmission match parameter is terminated operation, so
Afterwards the TTL video signal after terminated operation is carried out shaping processing and amplifying and obtains optimal TTL video letter
Number.
Further, the described TTL video signal sampling its electrical characteristic is the behaviour that is terminated
TTL video signal after dealing with；Described terminated operation includes that TTL signal impedance matching, TTL believe
Number equilibrium allocation, compensates the signal distortion because long range propagation is caused, decay, it is ensured that TTL signal
Quality.
Further, described step 3 caches every frame RGB data and the every frame that will have cached successively
The process that RGB data carries out comparison and detection with described raw image data successively includes: first cache n-th
Frame RGB data, after n-th frame RGB data has cached, continues caching the (n+1)th frame RGB data；
While caching the (n+1)th frame RGB data, by n-th frame RGB data and the original graph cached
As data carry out comparison and detection, after n-th frame RGB data has detected, the (n+1)th frame RGB data
Cache；Now continue detection the (n+1)th frame RGB data, cache the n-th+2 frame RGB data；It
Detect successively by the transmission sequence of RGB data afterwards, until current TTL video signal detection completes,
Wherein n is positive integer.
Further, before described every frame RGB data and raw image data detect, first distinguish
It is successively read each row of data of RGB data and each row of data of raw image data, every by read
Row RGB data and often row raw image data carry out simultaneously operating so that it is synchronism output.
Further, after described current TTL video signal detection completes, the institute of caching before removing
There is RGB data, the most again the rgb video in the TTL video signal of the lower piece image of caching
Signal.
The beneficial effects of the present invention is:
The TTL video signal that video source produces can be detected by the present invention, and the present invention passes through to arrange,
Can well adapt in different TTL transmission characteristics, the color range of video signal, transmission means, coding
The different qualities such as mode.
The electrical characteristic of the TTL video signal that video source produces can be detected, by defeated by the present invention
Enter TTL electric parameter standard, obtain testing result output display through comparison in the present invention.
The present invention can be to the view data detection of the TTL video signal that video source produces, by delaying in advance
Deposit every frame image data also to contrast with raw video image, thus judge whether each pixel just exports
Really, every two field picture all can detect.
The present invention can be to the highest TTL video resolution detection, and not only integrated level is high, reliable operation,
Capacity of resisting disturbance is strong, and simple to operate, economical and practical, can not only promote the inspection of TTL liquid crystal module
Survey reliability and efficiency, reduce its equipment cost and production cost, also will further improve relevant display
Popularizing of equipment.
The present invention can be by with FPGA (field programmable logic array) chip, DDR (Double Date
Rate double data rate) storage chip, A/D (analog/digital) conversion chip realize described all
Function；Above-mentioned device is all the common chip in market, they not only working stability, realize easily, and
Low price, it is to avoid the design complexity, the poor stability that cause because using various special chips, set
Meter high in cost of production problem.
Accompanying drawing explanation
Fig. 1 is the overhaul flow chart of the present invention.
Fig. 2 is the structured flowchart of the present invention.
Fig. 3 is the circuit block diagram of TTL transport module in Fig. 2.
Fig. 4 is the circuit block diagram of RGB data detection module in Fig. 2.
Fig. 5 is the circuit block diagram detecting control module in Fig. 2.
In figure: 1-TTL transport module, 11-TTL transmits matching module, 12-TTL signal shaping module；
13-TTL signal is electrically sampled and quantization modules；The electric detection module of 14-TTL；
3-RGB data detection module, 31-RGB signal buffer control module, 32-RGB frame data delay
Depositing the first module, 33-RGB frame data cache the second module, 34-original image buffer control module,
35-initial data image caches the first module, and 36-initial data image caches the second module, 37-RGB
Data detection module, 38-signal detecting result output module, 39-Data Detection fifo module；
4-detects control module, 41-Ethernet, RS232, RS485 interface module, 42-USB, SD
Card interface module, 43-upper-layer configured module.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, it is simple to clear
The present invention is understood on ground, but they do not constitute restriction to the present invention.
As Figure 1-5, the method for the TTL video signal that the detection video source of the present invention produces includes
Following steps:
Arranging control parameter in the PC of upper strata, PC controls parameter and arranges with to be detected video source identical,
Control parameter to include: TTL transmission match parameter (termination impedance, equilibrium), TTL electric parameter benchmark
(maximum voltage, minimum voltage, cross punching, undershoot, electric current etc.), tested image level resolution, hang down
Straight resolution (being also the resolution of original image).Above-mentioned PC control parameter by Ethernet or RS232,
RS485 Serial Port Line sends into detection control module 4.
Received above-mentioned containing PC control parameter by Ethernet, RS232, RS485 interface module 41
Ethernet, rs 232 serial interface signal and recover its parameter send into upper-layer configured module 43.PC controls upper strata
Configuration module 43 is distributed to other each functional modules.When each functional module completes relative set with just
After beginningization, upper-layer configured module 43 produces TTL and electrically detects control signal and electrically detect mould to TTL
Block 14, first detects the TTL signal electrical characteristic of detected video source.When electric testing result exists
View data detection is carried out again time in the range of TTL electric parameter benchmark.When detecting, detected
Video source reads original image and produces TTL video signal and be output to TTL transport module 1.
Step 1, electrically detects control signal to TTL according to the TTL that upper-layer configured module 43 sends
The electrical characteristic of video signal is sampled, and the electric parameter obtaining TTL video signal is electric with TTL
Parameter benchmark carries out comparison and detection, exports TTL electric testing result signal.
The TTL that TTL transmission matching module 11 exports according to upper-layer configured module 43 transmits match parameter
Be terminated operation to the TTL video signal received, with make great efforts by video source produce more chaotic
Signal reverts to tested TTL video signal, the TTL video signal after then being processed by terminated operation
Being sent to TTL signal electrically sample and quantization modules 13, described terminated operation includes that TTL signal hinders
Anti-coupling, TTL signal equilibrium allocation, compensate the signal distortion because long range propagation is caused, decay,
Guarantee TTL signal quality.The TTL video signal of input is carried out whole by TTL signal Shaping Module 12
Shape is amplified, to reach optimum signal quality, it is to avoid erroneous judgement, shaping occur in follow-up signal conversion and detection
After TTL video signal be rgb video signal, directly it can be carried out view data detection.
TTL signal is electrically sampled with quantization modules 13 to electricity such as the voltage of TTL video signal, electric currents
Gas characteristic is sampled, and institute's sampled signal (analog quantity) is quantified by AD conversion chip,
I.e. it is converted into different size of numeral bit value.The electric detection module of TTL 14 is receiving detection control
After the TTL that module sends electrically detects control signal and TTL electric parameter benchmark, by the TTL of sampling
The electrical value of signal contrasts with TTL electric parameter benchmark.If TTL sample magnitude is at TTL
Then represent between the maxima and minima of electric parameter benchmark that TTL video signal electrical quality is up to standard,
Otherwise TTL video signal electrical quality is the most up to standard.Then which ginseng is testing result (is i.e. tabulated
Whether up to standard number is) give signal detecting result output module 38, afterwards a road give module 43 and via
Ethernet, RS232, RS485 interface module 41 return to PC display result, and another road produces
Display signal feeding carries display screen 5 and shows.
After upper-layer configured module 43 obtains the electric testing result of TTL, if up to standard, start image voluntarily
Data Detection controls to RGB data detection module 3 so that it is receive the view data of rgb video signal
Automatically detection；Otherwise stop the detection of this TTL video signal, wait that PC does next step instruction,
It is i.e. that the electrical characteristic again detecting new TTL video signal is also off whole detection process.
Step 2, if the electric testing result of TTL that upper-layer configured module 43 receives is TTL video letter
Number requisite quality, then produce view data detection control signal, starts to cache described rgb video letter successively
Every frame RGB data in number (TTL video signal)；Produce original image and read control signal, open
Begin caching raw image data, then will cache according to original image horizontal resolution, vertical resolution
Good every frame RGB data carries out comparison and detection successively with described raw image data, exports view data
Testing result, the object of described detection includes each pixel size and the location of pixels of RGB data.
After TTL is the most up to standard, upper-layer configured module 43 is automatically by USB, SD card interface module
42 read original image (original image and detected video source are same image) and produce original image
Reading control signal makes it cache this image to original image buffer control module 34.Original image caches
This original image is first cached to initial data image and caches in the first module 35 by control module 34, when
Then it is cached to initial data image when detecting next width original image and caches the second module 36, these two moulds
Block does ping-pong operation and uses high speed DDR storage chip, thus can be without the figure of detection difference in real time paused
As data.
The rgb image data received first is cached and detects by RGB data detection module 3, and will detection
Result exports and shows to display screen 5 and be sent on PC display through module 43.When RGB data is examined
Survey when module 37 receives view data detection control signal and then send operation start control signal RGB letter
Number buffer control module 31 receives rgb video signal.When rgb signal buffer control module 31 connects
Receive a new two field picture (being i.e. found to have VSYNC from high level to low level saltus step), then will
This frame image data is cached to RGB frame data buffer storage the first module 32, when this frame (i.e. present frame, with
Calling n-th frame in the following text, n is positive integer) data are all cached to RGB frame data buffer storage the first module 32
After, continue caching the (n+1)th frame immediately in RGB frame data buffer storage the second module 33, notify simultaneously
RGB data detection module 37 n-th frame data buffer storage completes to detect it；Work as RGB data
The n-th frame data of caching in RGB frame data buffer storage the first module 32 are detected by detection module 37
Time, the (n+1)th frame RGB data is continued to be cached to RGB by rgb signal buffer control module 31 simultaneously
Frame data cache the second module 33；After the (n+1)th frame RGB data has cached, RGB data is examined
Survey module 37 and completed detection data cached in RGB frame data buffer storage the first module 32, now
It is further continued for data cached in RGB frame data buffer storage the second module 33 is detected.I.e. RGB believes
Number buffer control module 31 and RGB data detection module 37 caching alternately respectively, detection n-th,
N+1 frame RGB data, i.e. carries out the ping-pong operation between caching/detecting, so can be continuous without pause
Detect every frame data, improve detection efficiency and reliability.RGB frame data buffer storage the first module 32,
RGB frame data buffer storage the second module 33, initial data image cache the first module 35, raw-data map
As caching the second module 36 all can be realized by DDR storage chip, thus realize the big number of big resolution
According to amount, high read-write operation, high reliability operation.
When RGB data is detected by RGB data detection module 37, send operation control the most respectively
Signal operation original image buffer control module 34 processed, rgb signal buffer control module 31 read institute
The current raw image data cached and n-th frame are detected RGB data.Owing to cache module is phase
Same rate DDR storage chip is realized, but each DDR device is because of himself production technology and individuality
Difference, causes its read-write operation speed the most identical.Therefore for guaranteeing reliably to detect, postponed
The data read in storing module need to be stored into the corresponding FIFO (First of Data Detection fifo module 39 again
Input First Output) in, Data Detection fifo module 39 has two FIFO to be stored in former respectively
Beginning view data and detected RGB data.RGB data detection module 37 is according to the level configured
Resolution (i.e. a line view data number) is by operation original image buffer control module 34, RGB
Signal buffer control module 31 writes a line raw image data and the tested RGB data of a line to each
In FIFO, the data the most simultaneously read in these two FIFO compare, and record and compare
Pixel size result (identical then represent correct, otherwise represent mistake) and the location of pixels (the contrasted
Which pixel of several row, X, Y coordinate) and its result and position are given signal detecting result output
Module 38.Owing to caching again once in FIFO, the reading data that can simultaneously synchronize, therefore right
Than data time pipeline system can be used to operate, the most continuously read and compare, and constantly by number
According to being written to FIFO, whole read-write comparison procedure is without pausing.
When initial data image caches the first module 35, last raw image data is written to FIFO
In and after RGB data detection module 37 has compared, if rgb signal buffer control module 31
The data that n-th frame is the most also last have compared, and middle comparison procedure does not has mistake, then recognize
Correct for the output of this frame TTL image, then proceed to detect the (n+1)th frame data.If working as rgb signal
Buffer control module 31 still has data to be detected after last raw image data is completeer, then it is assumed that figure
As resolution mistake, and give signal detecting result output module 38 by RGB data testing result and pass
To upper strata PC, and the comparison stopping successive image (cannot judge detected image resolution ratio, compare
Meaningless).If when the resolution detection of view data is correct, at some pixel error of intermediate image then
Continue to detect the (n+1)th frame.
Electric to view data testing result and TTL testing result is entered by signal detecting result output module 38
Row is converted into the interface data of applicable display screen 5 and gives it to show, is simultaneously converted into upper layer software (applications) and can recognize that
Protocol format control module 4 after testing give upper strata PC and process.
After current piece image has detected, before tested video source changes piece image output, upper strata
PC first produces switching image command to upper-layer configured module 43.Upper-layer configured module 43 by USB,
Next width original image is passed to original image buffer control module 34 and is cached to by SD card interface module 42
Initial data image caches in the second module 36 that (initial data image caches the first module 35 caching
It is current original image).After completing caching, produce switching graphics control signals (be included in view data
In detection control signal) give RGB data detection module 37, the most tested video source begins to send out next
The TTL video signal of width image.RGB data detection module 37 is receiving switching graphics control signals
Shi Ze still completes present image be buffered in RGB frame data buffer storage the first module 32, RGB frame data
Cache the current n frame in the second module 33 and the comparison of n+1 frame RGB data, operate RGB afterwards
Signal buffer control module 31 is by RGB frame data buffer storage the first module 32, RGB frame data buffer storage
Two modules 33 reset, and view data detection process afterwards is same as described above.Give in view of video source
The process of the TTL video signal of one image has time delay, therefore also controls rgb signal buffer control module
Signal is received again after the transmission time of 31 time delays about field.
The content not being described in detail in this specification belongs to existing known to professional and technical personnel in the field
Technology.
Claims (5)
1. the method detecting the TTL video signal that video source produces, it is characterised in that comprise the following steps:
Step 1, electrically detect control signal according to TTL the electrical characteristic of TTL video signal is sampled, the electric parameter obtaining TTL video signal carries out comparison and detection with TTL electric parameter benchmark, if the electric parameter of TTL video signal is in the range of TTL electric parameter benchmark, then TTL electrically detects up to standard, otherwise TTL electrically detects the most up to standard, stops the detection of this TTL video signal；
Step 2, if TTL electrically detects up to standard, then produces view data detection control signal, starts to cache the every frame RGB data in described TTL video signal successively；Produce original image and read control signal, start to cache raw image data, then according to original image horizontal resolution, vertical resolution, the every frame RGB data cached is carried out comparison and detection with described raw image data successively, output view data testing result, the object of described detection includes each pixel size and the location of pixels of RGB data；
In described step 1 before the electrical characteristic of TTL video signal is sampled, first according to the characteristic of TTL video signal, receive TTL electric parameter benchmark and TTL transmits match parameter；Receive raw image data；Original image horizontal resolution, vertical resolution are set；Output TTL transmission match parameter and TTL electric parameter benchmark, produce described TTL and electrically detect control signal；
In described step 1 before the electrical characteristic of TTL video signal is sampled, the TTL video signal first produced video source according to TTL transmission match parameter is terminated operation, then the TTL video signal after terminated operation is carried out shaping processing and amplifying and obtains optimal TTL video signal.
The most according to claim 1 a kind of detect the method for TTL video signal that video source produces, it is characterised in that: described TTL video signal that its electrical characteristic is sampled be terminated operation process after TTL video signal；Described terminated operation includes TTL signal impedance matching, TTL signal equilibrium allocation, compensates the signal distortion because long range propagation is caused, decay, it is ensured that TTL signal quality.
A kind of method detecting the TTL video signal that video source produces the most according to claim 1, it is characterized in that: described step 2 caches every frame RGB data successively and the process that the every frame RGB data cached carries out comparison and detection with described raw image data successively is included: first caching n-th frame RGB data, after n-th frame RGB data has cached, continue caching the (n+1)th frame RGB data；While caching the (n+1)th frame RGB data, n-th frame RGB data and the raw image data cached being carried out comparison and detection, after n-th frame RGB data has detected, the (n+1)th frame RGB data has cached；Now continue detection the (n+1)th frame RGB data, cache the n-th+2 frame RGB data；Detecting successively by the transmission sequence of RGB data afterwards, until current TTL video signal detection completes, wherein n is positive integer.
A kind of method detecting the TTL video signal that video source produces the most according to claim 3, it is characterized in that: before described every frame RGB data and raw image data detect, it is successively read each row of data of RGB data and each row of data of raw image data the most respectively, by the often row RGB data read and often row raw image data carry out simultaneously operating so that it is synchronism output.
A kind of method detecting the TTL video signal that video source produces the most according to claim 3, it is characterized in that: after described current TTL video signal detection completes, all RGB data of caching before removing, the most again rgb video signal in the TTL video signal of the lower piece image of caching.
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| CN101742359A (en) * | 2010-01-27 | 2010-06-16 | 深圳市兆驰股份有限公司 | Video detection method, circuit board detection method and device |
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| CN101742359A (en) * | 2010-01-27 | 2010-06-16 | 深圳市兆驰股份有限公司 | Video detection method, circuit board detection method and device |
| CN201986083U (en) * | 2010-12-06 | 2011-09-21 | 广州视源电子科技有限公司 | Device for automatically detecting circuit board |
| CN103134803A (en) * | 2011-11-25 | 2013-06-05 | 西安中科麦特电子技术设备有限公司 | PCB optical detection system control circuit |
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Address after: 430070 Hongshan entrepreneurship center, No. 53, Nanhu Avenue, Hongshan District, Wuhan, Hubei Province, 4 Patentee after: Wuhan fine test electronics group Limited by Share Ltd Address before: 430070 Hongshan entrepreneurship center, No. 53, Nanhu Avenue, Hongshan District, Wuhan, Hubei Province, 4 Patentee before: Wuhan Jingce Electronic Technology Co., Ltd. |