CN101950515B - A kind of LED display pointwise correction method of master slave mode - Google Patents
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Abstract
The invention discloses a kind of LED display pointwise correction method of master slave mode, comprise main control end and from control end, comprise the following steps: A1, main control end, to described from control end transmission command, describedly controls described LED display display test pattern from control end according to described order; A2, while display test pattern, uses image capture device to gather described test pattern; A3, calculates the brightness value of each LED point in described test pattern; A4, calculate adjustment back light point brightness data according to the correction coefficient that systemic presupposition is put, main control end transmits described lamp point brightness data to described from control end; A5, controls described LED display display calibration result image according to described lamp point brightness data; A6, pre-sets correction coefficient correction according to described calibration result image to described, until obtain satisfied calibration result.
Description
Technical field
The present invention relates to technical field of LED display, 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 media, people can select different display mediums to carry out information carrying, as billboard, PDP video wall etc. are turned in neon bulb, print advertisements plate, three faces.But the defect such as above-mentioned display medium all exists the limited or brightness of displaying contents and effect is undesirable.Along with user constantly promotes for the performance requirement of display device in color, brightness, video effect, reliability, life-span etc. of indoor outer large screen display media, require that display system can demonstrate the true colour painting face close to natural colour, and there is higher display brightness, make display system no matter by day or evening, fine day or cloudy day, spectators can both be allowed to be clear that its displaying contents, can automatically regulate its video frequency program shown according to the change of natural light outside intensity, and there is higher reliability and be easy to safeguard.
Compared with other display medium, LED display has significant advantage, can meet above-mentioned requirements well.But the material cost high due to LED display and manufacturing cost, make people hang back in a lot of application scenario.
The cost of LED display is primarily of the cost structure of LED light emitting diode, and LED light emitting diode cost accounts for about 60% of LED display cost.Therefore the material cost reducing LED light emitting diode becomes the key reducing LED display cost.The price of the LED light emitting diode of usual same brand determines primarily of gear (i.e. wavelength and brightness range), and gear is wider, and the screening of LED light emitting diode color-division requires low, and thus price is lower, otherwise gear is narrower, and price is higher.Therefore, use the LED light emitting diode of wider gear, effectively can reduce the cost of LED display, LED display can be applied in more field.
The problem using the LED light emitting diode of wider gear to bring is the picture uniformity problem needing to solve preferably display screen, namely needs to carry out pointwise correction to LED display, comprises colourity adjustment and brightness adjustment; Moreover, the LED display through Long-Time Service also needs to carry out pointwise correction, makes it recover the display effect of uniformity.
At present, relevant manufacturers has developed the LED display display corrective system possessing pointwise correction function as shown in Figure 1, this system adopts the imaging device 2 of specialty, such as colorimeter, cameras etc. obtain the picture of LED display 1, after data handling machine 3 carries out software analysis, decomposite brightness and the colorimetric parameter of each pixel, offset is calculated again through software, form correction file, by upper computer software, transmit through sending card 4, be sent to receiving card 5 pairs of LED display to correct, realize the correction of brightness to each pixel and colourity.
Its bearing calibration is:
(1) optical device is used to obtain 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) downloaded in sending card or receiving card by order wire, and be saved to I2C chip;
(4), when receiving card powers on, the correction file in I2C chip is read; Receiving card control chip carries out brightness and chromaticity correction by corresponding correcting algorithm to each pixel.
Being not difficult to find, there is following shortcoming in such scheme:
Rig-site utilization is limited, because LED display 1 is often applied in higher position, and imaging device 2 generally will be placed on distance display screen place (tens of rice) far away, one is because the needs of imaging device imaging effect, two is because the reason of site obstructions, imaging device 2 must be placed on comparatively far away local, and so, the communication between imaging device 2 with LED display 1 is connected the bottleneck just becoming and restrict rig-site utilization;
Secondly, due to the program i.e. end operation after disposable adjustment, whether the correction file effect obtained meets user requires unknown, may occur that calibration result is unsatisfied with, and needs the situation that again corrects.
Therefore, prior art existing defects, needs to improve.
Summary of the invention
Technical matters to be solved by this invention is not enough for prior art, provides a kind of LED display pointwise correction method of master slave mode, facilitates communication link, facilitate scene immediately to check calibration result.
Technical scheme of the present invention is as follows:
A kind of LED display pointwise correction method of master slave mode, comprise main control end and from control end, comprise the following steps: A1, main control end, to described from control end transmission command, describedly controls described LED display display test pattern from control end according to described order; A2, while display test pattern, uses image capture device to gather described test pattern; A3, calculates the brightness value of each LED point in described test pattern; A4, according to brightness value and the described correction coefficient of each LED point, calculate the lamp point brightness data of the rear each LED point of adjustment, described main control end transmits described lamp point brightness data to described from control end; A5, controls described LED display display calibration result image according to described lamp point brightness data; A6, according to described calibration result image, revises described correction coefficient.
Be applied to such scheme, described pointwise correction method, described steps A 3 specifically performs following steps: in each lamp point areas imaging, obtain RGB three primary colours gradation data, do quadratic sum computing and obtain described brightness value; Described steps A 4 specifically performs following steps: adopt described correction coefficient to carry out preset formula process to described brightness value, obtains the lamp point brightness data after each LED point calibration.
Be applied to above-mentioned each relevant programme, described pointwise correction method, in described steps A 6, check described calibration result image whether to meet Expected Results, otherwise described correction coefficient is revised, continue to perform steps A 4.
Be applied to above-mentioned each relevant programme, described pointwise correction method, further comprising the steps of before described steps A 1: A0, build system, main control end parameter is set, from 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 steps A 1: according to described main control end parameter and described from control end parameter, described LED display to be divided into some regions.
Be applied to such scheme, described pointwise correction method, described steps A 1 specifically performs following operation: obtain described test pattern one by one for each region.
Be applied to such scheme, described pointwise correction method, in 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 specifically performs following operation: A31, locates lamp point position in described red test image, described green test pattern, 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, described blue test pattern.
Be applied to such scheme, described pointwise correction method, in described steps A 0, the red-correction coefficient, green correction coefficient and the blue-correction coefficient that are respectively used to revise red, green, blue three primary colours are set.
Be applied to such scheme, described pointwise correction method, described steps A 6, first the correction coefficient of red, green, blue three kinds of colors in all regions revised, then revise separately the correction coefficient of red, green, blue three kinds of colors of respective regions.
Be applied to above-mentioned each scheme, described pointwise correction method, described steps A 6 specifically performs following operation: receive described lamp point brightness data, generates simulation bitmap according to described lamp point brightness data, controls described LED display according to described simulation bitmap display calibration result image.
Be applied to above-mentioned each scheme, described pointwise correction method, also perform following steps A10 before 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, facilitate rig-site utilization, calibration result is checked immediately in scene, and dissatisfied continuation corrects effect, good results can terminate to correct, and improves calibration result.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art;
Fig. 2 is the schematic 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.
Embodiment 1
Be illustrated in figure 4 the process flow diagram of the inventive method, the present embodiment provides a kind of LED display pointwise correction method of master slave mode, first the LED display point-to-point correction system of composition graphs 2 to this master slave mode elaborates, and 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 controls the test pattern that image capture device 12 gathers LED display 15 display, obtain the brightness value of each LED point in described test pattern, adjustment back light point brightness data is calculated according to the correction coefficient that systemic presupposition is put, 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 from control module 14 with described LED display 15, from control module 14 for receiving order and lamp point brightness data by wireless receiving module 13, control LED display 15 according to described order and show test pattern, control LED display 15 according to described lamp point brightness data and show calibration result image; As shown in Figure 3, main control module 10 also comprises correction coefficient amending unit 102, revises described correction coefficient for the calibration result image shown according to LED display, until obtain satisfied calibration result.
The pointwise correction method that the present embodiment provides comprises the following steps: A0, system building, arranges main control end parameter and from control end parameter; This step is mainly built according to said system structure completion system, at main control end, software work pattern is set, such as holotype or from pattern, camera parameter and display screen parameter are set, such as f-number, ISO value, shutter etc., the parameters such as said aperture value, ISO value, shutter can certainly be solidified in advance and be arranged on main control end, do not need to arrange manually, screen body parameter mainly comprises the type of pixel of screen body, such as three lamp real image elements, four lamp virtual image elements, the resolution of screen body, module size etc. parameter; Above-mentioned parameter is arranged through communication module and is transferred to from control end by main control end, automatically completes optimum configurations from control end, also can by being provided with manually; Such as, in described steps A 0, the red-correction coefficient, green correction coefficient and the blue-correction coefficient that are respectively used to revise red, green, blue three primary colours are set.
Such as, before following steps A1, also following steps A10 is performed: pre-set described correction coefficient.
A1, complete after above-mentioned parameter arranges, in other words, after system building completes, main control end is to described from control end transmission command, described LED display display test pattern is controlled according to described order from control end, display screen such as can be allowed respectively to show following test pattern, light the red image of all red LED lamp point, light the green image of all green LED lamp point, light the blue image of all blue led lamp points, light " the star dot matrix image " on module or unit summit, can better realize positioning the imaging point in test pattern and calculating according to this " star dot matrix image ", such as, further comprising the steps of between described steps A 0 and steps A 1: according to described main control end parameter with from control end parameter, described LED display to be divided into some regions.
A2, while display test pattern, uses image capture device to gather described test pattern;
A3, calculates the brightness value of each LED point in described test pattern;
Such as, described steps A 3 specifically performs following steps: in each lamp point areas imaging, obtain RGB three primary colours gradation data, do quadratic sum computing and obtain described brightness value; Described steps A 4 specifically performs following steps: adopt described correction coefficient to carry out preset formula process to described brightness value, obtains the lamp point brightness data after each LED point calibration.
A4, calculate adjustment back light point brightness data according to the correction coefficient that systemic presupposition is put, main control end transmits described lamp point brightness data to described from control end;
Such as, in each lamp point areas imaging, obtain RGB three primary colours gradation data, do quadratic sum computing and obtain described brightness value; Then adopt described correction coefficient to carry out preset formula process to described brightness value, obtain the lamp point brightness data after each LED point calibration.
A5, controls described LED display display calibration result image according to described lamp point brightness data; Such as, described steps A 5 specifically performs following operation: receive described lamp point brightness data, generates simulation bitmap according to described lamp point brightness data, controls described LED display according to described simulation bitmap display calibration result image.
A6, pre-sets correction coefficient correction according to described calibration result image to described.Such as, in described steps A 6, check described calibration result image whether to meet Expected Results, otherwise described correction coefficient is revised, continue to perform steps A 1 or continue to perform steps A 4.
Such as, main control module by wireless transmitter module and wireless receiving module composition radio communication chain circuit send display test pattern order give from control module, this order can comprise, LED display is made to put azarin respectively, green, the image of blue three primary colours, also can comprise and make LED display show white balance image, various test pattern is being shown respectively from LED display under the control of control module, meanwhile, main control module is together with the imaged collecting device of time control, such as camera, gather various test pattern photo, after obtaining test pattern photo, main control module calculates the brightness value obtaining each lamp point in test pattern, such as in each lamp point areas imaging, obtain RGB three primary colours gradation data, then quadratic sum computing is done to RGB three primary colours gradation data, after obtaining brightness value, the correction coefficient pre-seted is utilized to process this brightness value, obtain the lamp point brightness data after each lamp point calibration, such as first above-mentioned brightness value is returned 1 change process, then the brightness value after returning 1 change process is done the process of K power, above-mentioned K is the correction coefficient of systemic presupposition value, the selection of this correction coefficient generally selects centre data, data near such as 1,
Afterwards, lamp point brightness data after above-mentioned correction is sent to from control module 14 by wireless transmission link, from control module 14, the lamp point brightness data after above-mentioned correction is carried out BMP bitmap-converted, or, the bitmap-converted of JPG or GIF and so on picture format, the small volume of such image file; Then this BMP bitmap is presented in LED display by display screen management tool, by observing this calibration result image, select whether to revise correction coefficient, if namely calibration result image effect is better, can select to stop correcting, if display effect is bad, such as partially red, can the above-mentioned correction coefficient of correction coefficient amending unit correction be passed through, until reach promising result.Preferred further, correction coefficient amending unit comprises red-correction coefficient correction subelement, green correction coefficient correction subelement and blue-correction coefficient correction subelement, is respectively used to revise the correction coefficient of red, green, blue three primary colours.Such as, circulation correcting mode process is step by step adopted.Such as, after above-mentioned steps A6, continue to perform steps A 1 or steps A 4.
Embodiment 2
Another example, as shown in Figure 3, in above-mentioned point-to-point correction system, main control module 10 also comprises the image acquisition control module 103, data processing unit 101 and the wireless transmit control module 104 that connect in turn; Image acquisition control module 103 is connected with image capture device 12, gathers described test pattern for controlling image capture device 12; Data processing unit 101, for receiving described test pattern, processes described test pattern and obtains described lamp point brightness data; Wireless transmit control module 104 is connected with wireless transmitter module 11, sends order and described lamp point brightness data for controlling wireless transmitter module 11 to wireless receiving module 13.
Another example, as shown in Figure 3, main control module 10 also comprises user input unit 105, for inputting the parameter of LED display, area division unit 106, described area division unit is connected with described user input unit and described wireless transmit control module, and for the LED display parameter that inputs according to user to described LED display zoning, subregion corrects.Such as, by a slip gauge then square LED display screen be divided into 3 × 3 totally 9 regions by the mode homalographic of pre-seting; And for example, one piece of regular rectangular shape LED display is divided into 3 × 3 totally 9 regions by the mode homalographic of pre-seting; And for example, one piece of regular rectangular shape LED display is divided into 4 × 3 totally 12 regions by the mode homalographic of pre-seting; And for example, one piece of regular rectangular shape LED display is divided into 4 × 5 totally 20 regions by the mode of pre-seting, wherein has at least a row region and other areas arranging region not etc.; And for example, one piece of irregular special shaped LED display screen is divided into 5 × 4 totally 20 regions by the mode of pre-seting, wherein has the area in a region and the area equation in other several regions at least.Each embodiment of the present invention is not restricted for concrete subregional method, and specific implementation obtains described test pattern for each region, then corrects separately for zonule or colony's correction.
Another example, also display device is comprised in above-mentioned point-to-point correction system, be connected with described area division unit, for showing divided regional, a LCD display being such as set for showing state and the zone boundary of regional, after a regional correction terminates, this region being shown as certain color to distinguish.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (3)
1. a LED display pointwise correction method for master slave mode, comprises main control end and from control end, it is characterized in that, comprise the following steps:
A0, builds system, arranges main control end parameter, from control end parameter; The red-correction coefficient, green correction coefficient and the blue-correction coefficient that are respectively used to revise red, green, blue three primary colours are set;
A1, described main control end, to described from control end transmission command, describedly controls described LED display display test pattern from control end according to described order; Described test pattern comprises red test image, green test pattern, blue test pattern and dot matrix image;
A2, while display test pattern, uses image capture device to gather described test pattern;
A3, calculates the brightness value of each LED point in described test pattern;
A4, according to brightness value and the correction coefficient of each LED point, calculate the lamp point brightness data of the rear each LED point of adjustment, described main control end transmits described lamp point brightness data to described from control end;
A5, controls described LED display display calibration result image according to described lamp point brightness data;
A6, according to described calibration result image, revises described correction coefficient; First the correction coefficient of red, green, blue three kinds of colors in all regions is revised, then revise separately the correction coefficient of red, green, blue three kinds of colors of respective regions;
Further comprising the steps of between A0 and steps A 1: according to described parameter, described LED display is divided into some regions; A1 specifically performs following operation: obtain described test pattern one by one for each region;
Described steps A 3 specifically performs following operation: A31, locates lamp point position in described red test image, described green test pattern, 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, described blue test pattern; Wherein, in each lamp point areas imaging, obtain RGB three primary colours gradation data, do quadratic sum computing and obtain described brightness value;
Described steps A 4 specifically performs following steps: adopt described correction coefficient to carry out preset formula process to described brightness value, obtains the lamp point brightness data after each LED point calibration.
2. pointwise correction method according to claim 1, is characterized in that, in described steps A 6, checks described calibration result image whether to meet Expected Results, otherwise revises described correction coefficient, continues to perform steps A 4.
3. according to the arbitrary described pointwise correction method of claim 1 to 2, it is characterized in that, described steps A 5 specifically performs following operation: receive described lamp point brightness data, generate simulation bitmap according to described lamp point brightness data, control described LED display according to described simulation bitmap display calibration result image.
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| CN102768816B (en) * | 2012-07-30 | 2015-09-23 | 西安诺瓦电子科技有限公司 | LED display automated correction method |
| CN103426403B (en) * | 2013-08-16 | 2015-09-16 | 西安诺瓦电子科技有限公司 | The correction image-pickup method of LED display, picture display process and bearing calibration |
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| CN106023883B (en) * | 2016-07-15 | 2018-08-17 | 西安诺瓦电子科技有限公司 | Local sexual abnormality lamp point processing method after LED display correction |
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