CN101950515A - Master-slave point-by-point correcting method for LED display screen - Google Patents
Master-slave point-by-point correcting method for LED display screen Download PDFInfo
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Abstract
The invention discloses a master-slave point-by-point correcting method for an LED display screen, which comprises a master control end and a slave control end, and comprises the following steps: A1, the master control end transmits a command to the slave control end, and the slave control end controls the LED display screen to display a test image according to the command; A2, an image acquiring device is utilized to acquire the test image while the test image is displayed; A3, the luminance characteristic value of LED lamp spots in the test image is calculated; A4, the adjusted lamp spot luminance data is calculated according to the correction coefficient preset by the system, and the master control end transmitts the lamp spot luniance data to the slave control end; A5, the LED display screen is controlled to display a corrected effect image according to the lamp spot luminance data; and A6, according to the corrected image, correcting the preset correction coefficient until the satisfied effect is obtained.
Description
Technical field
The present invention relates to LED display technique field, in particular a kind of LED display pointwise correction method of master slave mode.
Background technology
Along with the extensive application of various public information medium, people can select different display mediums to carry out information-bearing, turn over billboard, PDP video wall etc. as neon bulb, print advertisements plate, three faces.But all there are defectives such as the limited or brightness of displaying contents and effect be undesirable in above-mentioned display medium.Along with the user constantly promotes for the performance requirement of display device at aspects such as color, brightness, video effect, reliability, life-spans of the large screen display medium outside indoor, require display system can demonstrate the true colour painting face that approaches natural colour, and has higher display brightness, make display system no matter by day or evening, fine or cloudy, can both allow spectators be clear that its displaying contents, can regulate the video frequency program of its demonstration according to the variation of outside natural light intensity automatically, and have higher reliability and be easy to maintenance.
Compare with other display medium, LED display has significant advantage, can satisfy above-mentioned requirements well.But, because high material cost and the manufacturing cost of LED display, make prestige in a lot of application scenarios and step back.
Mainly by the cost structure of LED light emitting diode, LED light emitting diode cost accounts for about 60% of LED display cost to the cost of LED display.Therefore the material cost that reduces the LED light emitting diode becomes the key that reduces the LED display cost.Mainly by gear (being wavelength and brightness range) decision, gear is wide more for the price of the LED light emitting diode of common same brand, and LED light emitting diode beam split color separation screening requires low, thereby price is low more, otherwise gear is narrow more, and price is high more.Therefore, use the LED light emitting diode of broad gear, can effectively reduce the cost of LED display, LED display can be applied in more field.
The problem that the LED light emitting diode of use broad gear brings is the picture consistency problem that need solve display screen preferably, promptly needs LED display is carried out pointwise correction, comprises colourity adjustment and brightness adjustment; Moreover, also need to carry out pointwise correction, make it recover the display effect of uniformity through the long-term LED display of using.
At present, relevant producer has developed the LED display that possesses the pointwise correction function as shown in Figure 1 and has shown corrective system, this system adopts the imaging device 2 of specialty, colorimeter for example, cameras etc. obtain the picture of LED display 1, after data handling machine 3 carries out software analysis, decomposite the brightness and the colorimetric parameter of each pixel, go out offset through computed in software again, form correction file, by upper computer software, through sending card 4 transmission, be sent to 5 pairs of LED display of receiving card and proofread and correct, realize the brightness of each pixel and the correction of colourity.
Its bearing calibration is:
(1) use optical device to obtain the brightness and the colorimetric parameter of module/casing/screen body;
(2) use software to carry out analytical calculation, obtain corrected value, form correction file;
(3) download in transmission card or the receiving card by order wire, and be saved to the I2C chip;
When (4) receiving card powers on, read the correction file in the I2C chip; The receiving card control chip carries out brightness and chromaticity correction by corresponding correcting algorithm to each pixel.
Be not difficult to find that there is following shortcoming in such scheme:
Rig-site utilization is limited, because LED display 1 often is applied in the higher position, and imaging equipment 2 generally will be placed on distance display screen place far away (tens of rice), the one, because the needs of imaging device imaging effect, the 2nd, because the reason of on-the-spot barrier, imaging device 2 must be placed on far away local, and so, imaging device 2 is connected with communication between the LED display 1 just becomes the bottleneck that restricts rig-site utilization;
Secondly, owing to be end operation after the disposable adjustment of this scheme process, it is unknown whether the correction file effect that obtains meets customer requirements, and it is dissatisfied calibration result to occur, and the situation that need proofread and correct again.
Therefore, there is defective in prior art, needs to improve.
Summary of the invention
Technical matters to be solved by this invention is at the prior art deficiency, and a kind of LED display pointwise correction method of master slave mode is provided, and makes things convenient for communication link, makes things convenient for the scene to check calibration result immediately.
Technical scheme of the present invention is as follows:
A kind of LED display pointwise correction method of master slave mode, comprise the main control end and from control end, may further comprise the steps: A1, main control end, describedly control described LED display from control end according to described order and show test pattern from the control end transmission command to described; A2 when showing test pattern, uses image capture device to gather described test pattern; A3 calculates the brightness value of each LED lamp point in the described test pattern; A4 according to the brightness value and the described correction coefficient of each LED lamp point, calculates the lamp point brightness data of adjusting each LED lamp point of back, and described main control end transmits described lamp point brightness data to described from control end; A5 controls described LED display according to described lamp point brightness data and shows the calibration result image; A6 according to described calibration result image, revises described correction coefficient.
Be applied to such scheme, described pointwise correction method, the described steps A 3 concrete following steps of carrying out: in each lamp point imaging scope, obtain RGB three primary colours gradation data, do the quadratic sum computing and obtain described brightness value; The described steps A 4 concrete following steps of carrying out: adopt described correction coefficient that described brightness value is preset formula manipulation, obtain the lamp point brightness data behind each LED lamp point calibration.
Be applied to above-mentioned each relevant programme, described pointwise correction method in the described steps A 6, is checked described calibration result image whether to meet Expected Results, otherwise described correction coefficient is revised, and continues execution in step A4.
Be applied to above-mentioned each relevant programme, described pointwise correction method, further comprising the steps of before the described steps A 1: A0, build system, main control end parameter is set, from the control end parameter.
Be applied to above-mentioned each relevant programme, described pointwise correction method, further comprising the steps of between described steps A 0 and the steps A 1: as, described LED display to be divided into several regions according to described main control end parameter and described from the control end parameter.
Be applied to such scheme, described pointwise correction method, operation below described steps A 1 concrete execution the: obtain described test pattern one by one at each zone.
Be applied to such scheme, described pointwise correction method, in the described steps A 1, described test pattern comprises red test image, green test pattern, blue test pattern and dot matrix image, and, described steps A 3 concrete following operation: the A31 that carry out locate lamp point position in described red test image, described green test pattern, the described blue test pattern according to described dot matrix image and described red test image, described green test pattern, described blue test pattern; A32 obtains the brightness value of each lamp point in described red test image, described green test pattern, the described blue test pattern.
Be applied to such scheme, described pointwise correction method in the described steps A 0, is provided with and is respectively applied for red-correction coefficient, green correction coefficient and the blue-correction coefficient that the red, green, blue three primary colours are revised.
Be applied to such scheme, described pointwise correction method, described steps A 6 is at first revised the correction coefficient of three kinds of colors of red, green, blue of All Ranges, revises the correction coefficient of three kinds of colors of red, green, blue of individual areas then separately.
Be applied to above-mentioned each scheme, described pointwise correction method, operation below described steps A 6 concrete execution the: receive described lamp point brightness data, generate the simulation bitmap, control described LED display and show the calibration result image according to described simulation bitmap according to described lamp point brightness data.
Be applied to above-mentioned each scheme, described pointwise correction method is also carried out following steps A10 before the described steps A 1: pre-set described correction coefficient.
Adopt such scheme, the present invention is by employing main control module with from control module, and wireless telecommunications between the two connect, made things convenient for rig-site utilization, calibration result is checked at the scene immediately, and effect is proofreaied and correct by dissatisfied the continuation, effect satisfaction can finish to proofread and correct, and has improved calibration result.
Description of drawings
Fig. 1 is the synoptic diagram of prior art;
Fig. 2 is the synoptic diagram of one embodiment of the present invention;
Fig. 3 is the structural representation of one embodiment of the present invention;
Fig. 4 is the process flow diagram of the inventive method.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Be illustrated in figure 4 as the process flow diagram of the inventive method, present embodiment provides a kind of LED display pointwise correction method of master slave mode, at first in conjunction with Fig. 2 the LED display point-to-point correction system of this master slave mode is elaborated, this system architecture comprises: main control module 10, from control module 14, image capture device 12, wireless transmitter module 11, wireless receiving module 13 and LED display 15; Main control module 10 is connected with wireless transmitter module 11 with described image capture device 12, main control module 10 control image capture devices 12 are gathered the test pattern that LED display 15 shows, obtain the brightness value of each LED lamp point in the described test pattern, the correction factor calculation of putting according to systemic presupposition is adjusted back light point brightness data, and by wireless transmitter module to described wireless receiving module transmission command and described lamp point brightness data;
Be connected with wireless receiving module 13 with described LED display 15 from control module 14, be used for receiving order and lamp point brightness data from control module 14 by wireless receiving module 13, show test pattern according to described order control LED display 15, show the calibration result image according to described lamp point brightness data control LED display 15; As shown in Figure 3, main control module 10 also comprises correction coefficient amending unit 102, is used for according to the calibration result image that LED display shows described correction coefficient being revised, until obtaining satisfied calibration result.
The pointwise correction method that present embodiment provides may further comprise the steps: A0, and system building is provided with main control end parameter and from the control end parameter; This step is mainly finished system building according to the said system structure, at the main control end software work pattern is set, holotype or for example from pattern, camera parameter and display screen parameter are set, for example f-number, ISO value, shutter etc., parameters such as said aperture value, ISO value, shutter can certainly be solidified in advance and be arranged on the main control end, do not need to be provided with manually, screen body parameter mainly comprises the type of pixel that shields body, for example three lamp real image elements, four lamp virtual image elements, the resolution of screen body, module size or the like parameter; The main control end is transferred to the above-mentioned parameter setting from control end by communication module, finishes the parameter setting automatically from control end, also can finish by being provided with manually; For example, in the described steps A 0, be provided with and be respectively applied for red-correction coefficient, green correction coefficient and the blue-correction coefficient that the red, green, blue three primary colours are revised.
For example, before following steps A1, also carry out following steps A10: pre-set described correction coefficient.
A1, after finishing above-mentioned parameter and being provided with, in other words, after system building is finished, the main control end to described from the control end transmission command, control described LED display from control end according to described order and show test pattern, for example can allow display screen show following test pattern respectively, light the red image of all red LED lamp points, light the green image of all green LED lamp points, light the blue image of all blue led lamp points, light " the star dot matrix image " on module or summit, unit, can better realize the imaging point in the test pattern is positioned and calculates according to this " star dot matrix image "; For example, further comprising the steps of between described steps A 0 and the steps A 1: as, described LED display to be divided into several regions according to described main control end parameter with from the control end parameter.
A2 when showing test pattern, uses image capture device to gather described test pattern;
A3 calculates the brightness value of each LED lamp point in the described test pattern;
For example, the described steps A 3 concrete following steps of carrying out: in each lamp point imaging scope, obtain RGB three primary colours gradation data, do the quadratic sum computing and obtain described brightness value; The described steps A 4 concrete following steps of carrying out: adopt described correction coefficient that described brightness value is preset formula manipulation, obtain the lamp point brightness data behind each LED lamp point calibration.
A4 adjusts back light point brightness data according to the correction factor calculation that systemic presupposition is put, and the main control end transmits described lamp point brightness data to described from control end;
For example, in each lamp point imaging scope, obtain RGB three primary colours gradation data, do the quadratic sum computing and obtain described brightness value; Adopt described correction coefficient that described brightness value is preset formula manipulation then, obtain the lamp point brightness data behind each LED lamp point calibration.
A5 controls described LED display according to described lamp point brightness data and shows the calibration result image; For example, operation below described steps A 5 concrete execution the: receive described lamp point brightness data, generate the simulation bitmap, control described LED display and show the calibration result image according to described simulation bitmap according to described lamp point brightness data.
A6 pre-sets correction coefficient correction according to described calibration result image to described.For example, in the described steps A 6, check described calibration result image whether to meet Expected Results, otherwise described correction coefficient is revised, continue execution in step A1 or continue execution in step A4.
For example, the radio communication chain circuit that the main control module is formed by wireless transmitter module and wireless receiving module sends the order that shows test pattern and gives from control module, this order can comprise, make LED display put azarin respectively, green, the image of blue three primary colours, also can comprise and make LED display show the white balance image, show various test patterns respectively in LED display under the control of control module, meanwhile, the main control module is together with the imaged collecting device of time control, camera for example, gather various test pattern photos, obtain after the test pattern photo, the main control module is calculated the brightness value that obtains each lamp point in the test pattern, for example in each lamp point imaging scope, obtain RGB three primary colours gradation data, then RGB three primary colours gradation data is done the quadratic sum computing, obtain after the brightness value, the correction coefficient that utilization pre-sets is handled this brightness value, obtain the lamp point brightness data behind each lamp point calibration, for example at first above-mentioned brightness value is done and returned 1 to change processing, to return 1 to change brightness value after the processing and make the K power and handle then, above-mentioned K is the correction coefficient of systemic presupposition value, centre data is generally selected in the selection of this correction coefficient, such as near 1 data;
Afterwards, lamp point brightness data after the above-mentioned correction is sent to from control module 14 by wireless transmission link, carry out the BMP bitmap-converted from the lamp point brightness data of control module 14 after with above-mentioned correction, perhaps, the bitmap-converted of JPG or GIF and so on picture format, the volume of image file is less like this; Then this BMP bitmap is presented on the LED display by the display screen management tool, by observing this calibration result image, select whether correction coefficient to be revised, if promptly the calibration result image effect is better, can select to stop proofreading and correct, if display effect is bad, such as red partially, can pass through the above-mentioned correction coefficient of correction coefficient amending unit correction, until reaching promising result.Further preferred, the correction coefficient amending unit comprises red-correction coefficient correction subelement, green correction coefficient correction subelement and blue-correction coefficient correction subelement, is respectively applied for the correction coefficient of red, green, blue three primary colours is revised.For example, adopt the correcting mode that circulates step by step to handle.For example, after above-mentioned steps A6, continue execution in step A1 or steps A 4.
Another example, as shown in Figure 3, in the above-mentioned point-to-point correction system, main control module 10 also comprises image acquisition control module 103, data processing unit 101 and the wireless transmit control module 104 that connects in turn; Image acquisition control module 103 is connected with image capture device 12, is used to control image capture device 12 and gathers described test pattern; Data processing unit 101 is used to receive described test pattern, handles described test pattern and obtains described lamp point brightness data; Wireless transmit control module 104 is connected with wireless transmitter module 11, is used to control wireless transmitter module 11 and sends order and described lamp point brightness data to wireless receiving module 13.
Another example, as shown in Figure 3, main control module 10 also comprises user input unit 105, be used to import the parameter of LED display, area dividing unit 106, described area dividing unit is connected with described wireless transmit control module with described user input unit, and the LED display parameter that is used for importing according to the user is to described LED display zoning, and proofread and correct the subregion.For example, with a slip gauge then the square LED display screen be divided into 3 * 3 totally 9 zones by the mode homalographic of pre-seting; And for example, with a slip gauge then the rectangle LED display be divided into 3 * 3 totally 9 zones by the mode homalographic of pre-seting; And for example, with a slip gauge then the rectangle LED display be divided into 4 * 3 totally 12 zones by the mode homalographic of pre-seting; And for example, with a slip gauge then the rectangle LED display be divided into 4 * 5 totally 20 zones by the mode of pre-seting, wherein have at least the areas in a row zone and other row zones not wait; And for example, an irregular special shaped LED display screen is divided into 5 * 4 totally 20 zones by the mode of pre-seting, wherein has at least several regional areas of area and other in a zone to equate.Each embodiment of the present invention does not limit for concrete subregional method, and specific implementation is to obtain described test pattern at each zone, proofreaies and correct separately for the zonule then or colony's correction.
Another example, also comprise display device in the above-mentioned point-to-point correction system, be connected with described area dividing unit, be used to show each zone of being divided, a LCD display for example is set is used to the state and the zone boundary that show that each is regional, after a regional correction finishes, this zone is shown as certain color so that distinguish.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (10)
1. the LED display pointwise correction method of a master slave mode, comprise the main control end and, it is characterized in that, may further comprise the steps: A1 from control end, described main control end, is describedly controlled described LED display from control end according to described order and is shown test pattern from the control end transmission command to described; A2 when showing test pattern, uses image capture device to gather described test pattern; A3 calculates the brightness value of each LED lamp point in the described test pattern; A4 according to the brightness value and the correction coefficient of each LED lamp point, calculates the lamp point brightness data of adjusting each LED lamp point of back, and described main control end transmits described lamp point brightness data to described from control end; A5 controls described LED display according to described lamp point brightness data and shows the calibration result image; A6 according to described calibration result image, revises described correction coefficient.
2. pointwise correction method according to claim 1 is characterized in that, the described steps A 3 concrete following steps of carrying out: obtain RGB three primary colours gradation data in each lamp point imaging scope, do the quadratic sum computing and obtain described brightness value; The described steps A 4 concrete following steps of carrying out: adopt described correction coefficient that described brightness value is preset formula manipulation, obtain the lamp point brightness data behind each LED lamp point calibration.
3. pointwise correction method according to claim 1 is characterized in that, in the described steps A 7, checks described calibration result image whether to meet Expected Results, otherwise described correction coefficient is revised, and continues execution in step A6.
4. pointwise correction method according to claim 1 is characterized in that, and is further comprising the steps of before the described steps A 1: A0, build system, and main control end parameter is set, from the control end parameter.
5. pointwise correction method according to claim 1 is characterized in that, and is further comprising the steps of between described steps A 0 and the steps A 1: according to described parameter, described LED display is divided into several regions.
6. pointwise correction method according to claim 5 is characterized in that, operation below described steps A 1 concrete execution the: obtain described test pattern one by one at each zone.
7. pointwise correction method according to claim 6, it is characterized in that, in the described steps A 1, described test pattern comprises red test image, green test pattern, blue test pattern and dot matrix image, and, described steps A 3 concrete following operation: the A31 that carry out locate lamp point position in described red test image, described green test pattern, the described blue test pattern according to described dot matrix image and described red test image, described green test pattern, described blue test pattern; A32 obtains the brightness value of each lamp point in described red test image, described green test pattern, the described blue test pattern.
8. pointwise correction method according to claim 7 is characterized in that, in the described steps A 0, is provided with and is respectively applied for red-correction coefficient, green correction coefficient and the blue-correction coefficient that the red, green, blue three primary colours are revised.
9. pointwise correction method according to claim 8, it is characterized in that, described steps A 6 is at first revised the correction coefficient of three kinds of colors of red, green, blue of All Ranges, revises the correction coefficient of three kinds of colors of red, green, blue of individual areas then separately.
10. according to the arbitrary described pointwise correction method of claim 1 to 9, it is characterized in that, operation below described steps A 6 concrete execution the: receive described lamp point brightness data, generate the simulation bitmap according to described lamp point brightness data, control described LED display and show the calibration result image according to described simulation bitmap; Perhaps, also carry out following steps A10 before the described steps A 1: pre-set described correction coefficient.
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| CN102768816A (en) * | 2012-07-30 | 2012-11-07 | 西安诺瓦电子科技有限公司 | Automatic LED (light-emitting diode) display screen correction method |
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