CN104469350A - 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 method detecting the TTL vision signal that video source produces.
Background technology
Liquid crystal display module (Liquid Crystal Display Module, hereinafter referred to as module) and the use of relevant liquid crystal display (hereinafter referred to as equipment) very general, simultaneously also due to TTL (Transistor Transistor Logic, transistor-transistor logic level) signal stabilization is reliable, biography speed is high, power consumption is lower, and a lot of module and equipment all pass through the display interface adopting this signal as receiver, video image.
Carry out producing at module and equipment thereof, debug, videograph process time need to produce by video signal source or video adapting plate (being all called for short video source below) TTL vision signal to provide module displays signal source to it, therefore guarantee that the vision signal correctness that video source produces and reliability are the prerequisites ensureing module displays.
At present, market there is no for video source field correctness, the reliability that unified standard guarantees the TTL vision signal exported, the detection of the picture signal that video source exports all is identified shown image pixel one by one by human eye, manually cut figure and continue to judge.This detection mode operating personnel not only easily judge by accident, are difficult to localized reason place when there is display problem; And be easily subject to the subjective impact of people by eye recognition, operating personnel are for a long time facing to image, and eyes are very easily tired, and these all can impact testing result; Again need build test platform when changing module, thus cause inefficiency, complex operation.
Therefore a kind of technical scheme is needed to detect, without the need to artificial judgement the TTL picture signal that video source produces reliable, errorless, efficiently.
Summary of the invention
Object of the present invention is exactly the deficiency existed to solve above-mentioned background technology, provides a kind of method detecting the TTL vision signal that video source produces, and it has, and reliability is high, nothing erroneous judgement, feature simple to operate, detection efficiency is high, cost is low.
The technical solution used in the present invention is: a kind of method detecting the TTL vision signal that video source produces, comprises the following steps:
Step 1, sample according to the electrical characteristic of the electric detection control signal of TTL to TTL vision signal, the electric parameter of acquisition TTL vision signal and TTL electric parameter benchmark carry out contrast and detect, if the electric parameter of TTL vision signal is in the scope of TTL electric parameter benchmark, then TTL electrically detects up to standard, otherwise TTL electrically detects not up to standard, stop the detection of this TTL vision signal;
Step 2, if TTL electrically detects up to standard, then produces view data detection control signal, starts the every frame RGB data in TTL vision signal described in buffer memory successively; Produce original image and read control signal, start buffer memory raw image data, then every frame RGB data good for buffer memory is carried out contrast with described raw image data successively detect according to original image horizontal resolution, vertical resolution, output image data testing result, the object of described detection comprises each pixel size and the location of pixels of RGB data.
Further, in described step 1 before sampling to the electrical characteristic of TTL vision signal, first according to the characteristic of TTL vision signal, receive TTL electric parameter benchmark and TTL transmission match parameter; Receive raw image data; Original image horizontal resolution, vertical resolution are set; Export TTL and transmit match parameter and TTL electric parameter benchmark, produce the electric detection control signal of described TTL.
Further, in described step 1 before the electrical characteristic of TTL vision signal is sampled, first transmit match parameter according to TTL to be terminated operation to the TTL vision signal that video source produces, then shaping amplification process is carried out to the TTL vision signal after terminated operation and obtain best TTL vision signal.
Further, described TTL vision signal of sampling to its electrical characteristic is the TTL vision signal be terminated after operational processes; Described terminated operation comprises TTL signal impedance coupling, the configuration of TTL signal equalization, compensates the signal distortion because long range propagation causes, decay, guarantees TTL signal quality.
Further, buffer memory every frame RGB data and every frame RGB data good for buffer memory is carried out successively contrast the process detected with described raw image data and comprise successively in described step 3: first buffer memory n-th frame RGB data, after n-th frame RGB data buffer memory completes, continue buffer memory (n+1)th frame RGB data; While buffer memory (n+1)th frame RGB data, the n-th frame RGB data and the good raw image data of buffer memory are carried out contrast and detects, after the n-th frame RGB data has detected, the (n+1)th frame RGB data buffer memory is complete; Now continue detection (n+1)th frame RGB data, buffer memory n-th+2 frame RGB data; 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 read each row of data of RGB data and each row of data of raw image data respectively successively, by the often row RGB data read and often row raw image data carry out simultaneous operation, make its synchronism output.
Further, after described current TTL video signal detection completes, all RGB data of buffer memory before removing, afterwards more again under buffer memory piece image TTL vision signal in rgb video signal.
Beneficial effect of the present invention is:
The present invention can detect the TTL vision signal that video source produces, and the present invention, by arranging, well can be adapted to the different qualities such as color range, transmission means, coded system of different TTL transmission characteristics, vision signal.
The present invention can detect the electrical characteristic of the TTL vision signal that video source produces, and by input TTL electric parameter standard, obtains testing result and output display in the present invention through comparison.
The present invention can detect the view data of the TTL vision signal that video source produces, by the every frame image data of buffer memory in advance and and raw video image contrast, thus judge whether each pixel exports correctly, and every two field picture all can detect.
The present invention can detect the highest TTL video resolution, not only integrated level is high, reliable operation, antijamming capability are strong, and it is simple to operate, economical and practical, detecting reliability and the efficiency of TTL liquid crystal module can not only be promoted, reduce its equipment cost and production cost, also will improve the universal of related display device further.
The present invention is by realizing described repertoire with FPGA (field programmable logic array) chip, DDR (Double DateRate double data rate) storage chip, A/D (analog/digital) conversion chip; Above-mentioned device is all the common chips in market, they not only working stability, realize easily, and low price, avoid the problem such as design complexity, poor stability, design cost height caused because using various special chip.
Accompanying drawing explanation
Fig. 1 is overhaul flow chart of the present invention.
Fig. 2 is 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 of detection control module in Fig. 2.
In figure: 1-TTL transport module, 11-TTL transmits matching module, 12-TTL signal shaping module; The electric sampling and Quantifying module of 13-TTL signal; The electric detection module of 14-TTL;
3-RGB data detection module, 31-RGB signal buffer control module, 32-RGB frame data buffer memory first module, 33-RGB frame data buffer memory second module, 34-original image buffer control module, 35-initial data image buffer memory first module, 36-initial data image buffer memory second module, 37-RGB data detection module, 38-signal detecting result output module, 39-Data Detection fifo module;
4-detection control module, 41-Ethernet, RS232, RS485 interface module, 42-USB, SD card interface module, 43-upper-layer configured module.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, is convenient to be well understood to the present invention, but they do not form restriction to the present invention.
As Figure 1-5, the method for the TTL vision signal of detection video source generation of the present invention comprises the following steps:
In the PC of upper strata, controling parameters is set, PC controling parameters arranges with to be detected video source identical, controling parameters comprises: TTL transmits match parameter (termination impedance, balanced), TTL electric parameter benchmark (maximum voltage, minimum voltage, overshoot, undershoot, electric current etc.), tested image level resolution, vertical resolution (being also the resolution of original image).Above-mentioned PC controling parameters sends into detection control module 4 by Ethernet or RS232, RS485 Serial Port Line.
Above-mentioned Ethernet containing PC controling parameters, rs 232 serial interface signal recover its parameter and send into upper-layer configured module 43 is received by Ethernet, RS232, RS485 interface module 41.PC controls upper-layer configured module 43 and is distributed to other each functional modules.After each functional module completes relative set and initialization, upper-layer configured module 43 produces TTL electric detection control signal to the electric detection module 14 of TTL, first detects the TTL signal electrical characteristic of detected video source.View data detection is carried out again when electric testing result is in the scope of TTL electric parameter benchmark.When detecting, detected video source reads original image and produces TTL vision signal and outputted to TTL transport module 1.
Step 1, sample according to the electrical characteristic of the electric detection control signal of TTL to TTL vision signal that upper-layer configured module 43 sends, the electric parameter of acquisition TTL vision signal and TTL electric parameter benchmark carry out contrast and detect, and export the electric testing result signal of TTL.
TTL transmits TTL transmission match parameter that matching module 11 exports according to upper-layer configured module 43 and to be terminated operation to the TTL vision signal received, tested TTL vision signal is become with the more chaotic signal recuperation of making great efforts video source produces, then the TTL vision signal after terminated operation process is sent to the electric sampling and Quantifying module 13 of TTL signal, described terminated operation comprises TTL signal impedance coupling, the configuration of TTL signal equalization, compensate the signal distortion because long range propagation causes, decay, guarantee TTL signal quality.The TTL vision signal of TTL signal shaping module 12 to input carries out shaping amplification, to reach optimum signal quality, avoid follow-up signal to change and detect occurring erroneous judgement, the TTL vision signal after shaping is rgb video signal, directly can carry out view data detection to it.
The electrical characteristic such as voltage, electric current of the electric sampling and Quantifying module of TTL signal 13 pairs of TTL vision signals is sampled, and institute's sampled signal (analog quantity) is quantized by AD conversion chip, namely converts the digital bit value of different size to.The electrical value of the TTL signal of sampling and TTL electric parameter benchmark, after receiving the electric detection control signal of TTL and TTL electric parameter benchmark that detection control module sends, contrast by the electric detection module of TTL 14.If TTL sample magnitude between the maxima and minima of TTL electric parameter benchmark, represents that TTL vision signal electrical quality is up to standard, otherwise TTL vision signal electrical quality is not up to standard.Then signal detecting result output module 38 is given by testing result (whether up to standardly namely tabulating which parameter), a road is given module 43 and is returned to PC display result via Ethernet, RS232, RS485 interface module 41 afterwards, and another road generation display 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 view data detection control voluntarily to RGB data detection module 3, its view data receiving rgb video signal is detected automatically; Otherwise stop the detection of this TTL vision signal, wait for PC do next step instruction, be namely again detect new TTL vision signal electrical characteristic or stop whole testing process.
Step 2, if the electric testing result of TTL that upper-layer configured module 43 receives is that TTL video signal quality is up to standard, then produces view data detection control signal, starts the every frame RGB data in rgb video signal described in buffer memory (TTL vision signal) successively; Produce original image and read control signal, start buffer memory raw image data, then every frame RGB data good for buffer memory is carried out contrast with described raw image data successively detect according to original image horizontal resolution, vertical resolution, output image data testing result, the object of described detection comprises each pixel size and the location of pixels of RGB data.
After TTL is electrically up to standard, upper-layer configured module 43 automatically reads original image (original image and detected video source are same image) by USB, SD card interface module 42 and produces original image reading control signal and makes this image of its buffer memory to original image buffer control module 34.This original image is first cached in initial data image buffer memory first module 35 by original image buffer control module 34, initial data image buffer memory second module 36 is then cached to when detecting next width original image, these two modules are done ping-pong operation and adopt high speed DDR storage chip, thus can without the real-time detection different images data of pausing.
RGB data detection module 3 detects the first buffer memory of the rgb image data received again, and testing result is exported to display screen 5 and show and be sent on PC through module 43 and show.When RGB data detection module 37 receives view data detection control signal, then transmit operation control signal startup rgb signal buffer control module 31 receives rgb video signal.When rgb signal buffer control module 31 receives a new two field picture (namely finding that there is VSYNC from high level to low level saltus step), then this frame image data is cached to RGB frame data buffer storage first module 32, when this frame (i.e. present frame, hereinafter referred to as the n-th frame, n is positive integer) after data are all cached to RGB frame data buffer storage first module 32, continue buffer memory (n+1)th frame immediately in RGB frame data buffer storage second module 33, notify that RGB data detection module 37 n-th frame data buffer memory completes and need detect it simultaneously; When in RGB data detection module 37 pairs of RGB frame data buffer storage first modules 32, the n-th frame data of buffer memory detect, the (n+1)th frame RGB data continues to be cached to RGB frame data buffer storage second module 33 by rgb signal buffer control module 31 simultaneously; After the (n+1)th frame RGB data buffer memory completes, RGB data detection module 37 has completed detection data cached in RGB frame data buffer storage first module 32, now continues to detect data cached in RGB frame data buffer storage second module 33 again.Namely rgb signal buffer control module 31 and RGB data detection module 37 replace respectively buffer memory, detect n-th, n+1 frame RGB data, namely the ping-pong operation between buffer memory/detection is carried out, without the every frame data of continuous detection paused, detection efficiency and reliability can be improve like this.RGB frame data buffer storage first module 32, RGB frame data buffer storage second module 33, initial data image buffer memory first module 35, initial data image buffer memory second module 36 all realize by DDR storage chip, thus realize large resolution big data quantity, high read-write operation, high reliability operation.
When RGB data detection module 37 pairs of RGB data detect, first transmit operation control signal respectively operates original image buffer control module 34, rgb signal buffer control module 31 reads the good current raw image data of institute's buffer memory and the n-th frame is detected RGB data.Due to cache module by phase same rate DDR storage chip is realized, but each DDR device is because of himself production technology and individual difference, causes its read-write operation speed not identical.Therefore for guaranteeing reliable Detection, need be stored in the corresponding FIFO (FirstInput First Output) of Data Detection fifo module 39 by the data read from cache module, Data Detection fifo module 39 has two FIFO to come respectively stored in raw image data and detected RGB data again.RGB data detection module 37 passes through operation original image buffer control module 34 according to configured horizontal resolution (i.e. a line view data number), rgb signal buffer control module 31 writes a line raw image data and the tested RGB data of a line in respective FIFO, the data then simultaneously read afterwards in these two FIFO compare, and (identical then expression is correct to record the pixel size result compared, otherwise represent mistake) and contrast location of pixels (which pixel of which row, X, Y-coordinate) and give signal detecting result output module 38 by its result and position.Due in FIFO again buffer memory once, reading data that can be simultaneously synchronous, therefore can adopt pipeline system operate when correction data, namely continuously reading is compared, and is constantly writing data into FIFO, and whole read-write comparison procedure is without pause.
When last raw image data to be written in FIFO and after RGB data detection module 37 has compared by initial data image buffer memory first module 35, compare if rgb signal buffer control module 31 n-th frame is also last data accordingly, and middle comparison procedure does not have mistake, then think that this frame TTL image exports correct, then continue detection (n+1)th frame data.If when rgb signal buffer control module 31 in the end raw image data completeer after still have data to be detected, then think image resolution ratio mistake, and give signal detecting result output module 38 by RGB data testing result and pass to upper strata PC, and stop the comparison of successive image (detected image resolution ratio cannot be judged, more meaningless).If when the resolution of view data detects correct, then still continue detection (n+1)th frame at some pixel error of intermediate image.
The interface data that view data testing result and the electric testing result of TTL carry out converting to applicable display screen 5 gives it to show by signal detecting result output module 38, convert to simultaneously the discernible protocol format of upper layer software (applications) after testing control module 4 give upper strata PC process.
After current piece image has detected, before tested video source changes piece image output, upper strata PC first produces and switches image command to upper-layer configured module 43.Next width original image to be passed to original image buffer control module 34 by USB, SD card interface module 42 and to be cached in initial data image buffer memory second module 36 (initial data image buffer memory first module 35 buffer memory be current original image) by upper-layer configured module 43.Switch graphics control signals (being included in view data detection control signal) to RGB data detection module 37 when producing after completing buffer memory, tested video source starts the TTL vision signal sending lower piece image simultaneously.RGB data detection module 37 then still complete when receiving and switching graphics control signals present image be buffered in the comparison of current n frame in RGB frame data buffer storage first module 32, RGB frame data buffer storage second module 33 and n+1 frame RGB data, operate rgb signal buffer control module 31 afterwards RGB frame data buffer storage first module 32, RGB frame data buffer storage second module 33 to be reset, view data testing process is afterwards same as described above.Consider that the process that video source gives the TTL vision signal of an image has time delay, therefore Received signal strength again after also controlling the transmission time that the time delay of rgb signal buffer control module 31 is about field.
The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (7)
1. detect a method for the TTL vision signal that video source produces, it is characterized in that, comprise the following steps:
Step 1, sample according to the electrical characteristic of the electric detection control signal of TTL to TTL vision signal, the electric parameter of acquisition TTL vision signal and TTL electric parameter benchmark carry out contrast and detect, if the electric parameter of TTL vision signal is in the scope of TTL electric parameter benchmark, then TTL electrically detects up to standard, otherwise TTL electrically detects not up to standard, stop the detection of this TTL vision signal;
Step 2, if TTL electrically detects up to standard, then produces view data detection control signal, starts the every frame RGB data in TTL vision signal described in buffer memory successively; Produce original image and read control signal, start buffer memory raw image data, then every frame RGB data good for buffer memory is carried out contrast with described raw image data successively detect according to original image horizontal resolution, vertical resolution, output image data testing result, the object of described detection comprises each pixel size and the location of pixels of RGB data.
2. a kind of method detecting the TTL vision signal that video source produces according to claim 1, it is characterized in that: in described step 1 before the electrical characteristic of TTL vision signal is sampled, first according to the characteristic of TTL vision signal, receive TTL electric parameter benchmark and TTL transmission match parameter; Receive raw image data; Original image horizontal resolution, vertical resolution are set; Export TTL and transmit match parameter and TTL electric parameter benchmark, produce the electric detection control signal of described TTL.
3. a kind of method detecting the TTL vision signal that video source produces according to claim 2, it is characterized in that: in described step 1 before the electrical characteristic of TTL vision signal is sampled, first transmit match parameter according to TTL to be terminated operation to the TTL vision signal that video source produces, then shaping amplification process is carried out to the TTL vision signal after terminated operation and obtain best TTL vision signal.
4. a kind of method of TTL vision signal detecting video source and produce according to claim 3, is characterized in that: described TTL vision signal of sampling to its electrical characteristic is the TTL vision signal be terminated after operational processes; Described terminated operation comprises TTL signal impedance coupling, the configuration of TTL signal equalization, compensates the signal distortion because long range propagation causes, decay, guarantees TTL signal quality.
5. a kind of method detecting the TTL vision signal that video source produces according to claim 1, it is characterized in that: buffer memory every frame RGB data and every frame RGB data good for buffer memory is carried out successively contrast the process detected with described raw image data and comprise successively in described step 2: first buffer memory n-th frame RGB data, after n-th frame RGB data buffer memory completes, continue buffer memory (n+1)th frame RGB data; While buffer memory (n+1)th frame RGB data, the n-th frame RGB data and the good raw image data of buffer memory are carried out contrast and detects, after the n-th frame RGB data has detected, the (n+1)th frame RGB data buffer memory is complete; Now continue detection (n+1)th frame RGB data, buffer memory n-th+2 frame RGB data; Detect successively by the transmission sequence of RGB data afterwards, until current TTL video signal detection completes, wherein n is positive integer.
6. a kind of method detecting the TTL vision signal that video source produces according to claim 5, it is characterized in that: before described every frame RGB data and raw image data detect, first read each row of data of RGB data and each row of data of raw image data respectively successively, by the often row RGB data read and often row raw image data carry out simultaneous operation, make its synchronism output.
7. a kind of method detecting the TTL vision signal that video source produces according to claim 5, it is characterized in that: after described current TTL video signal detection completes, all RGB data of buffer memory before removing, afterwards more again under buffer memory piece image TTL vision signal in rgb video signal.
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