CN101692326A - System and method for on-site point-by-point calibration of brightness and chrominance of the whole screen of LED display screen - Google Patents
System and method for on-site point-by-point calibration of brightness and chrominance of the whole screen of LED display screen Download PDFInfo
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Abstract
The invention discloses a system and a method for on-site point-by-point calibration of the brightness and chrominance of the whole screen of an LED display screen. The system comprises LED display screen optical parameter acquisition equipment, display screen calibration parameter processing equipment, display screen signal input control and parameter transmission equipment and display screen calibration operation and screen control equipment. The method comprises the following steps: acquiring image data of information on original red, green and blue values of a single point in the lightened part of the LED display screen and values of actual brightness and colors when single colors of red, green, blue and while are displayed; and determining the calibration coefficients of the single point to realize calibration. The method acquires data by in a way of uniformly distributing the luminous points of the display screen in arrays which have the same point number and shape and alternately distributed at equal intervals, thereby avoiding clear horizontal and vertical patterns which use an acquisition area as a unit and are caused by the jump of regional edge calibration data when an original suborigin acquires data and interference among adjacent points caused by reduced pixel pitch and ensuring the calibration effect.
Description
Technical field
The present invention relates to image and show the correction field, specifically be meant a kind of system and corresponding bearing calibration that the whole screen of LED display on-site point-by-point YC is proofreaied and correct that be used for.
Background technology
LED display reaches the effect of reappearing the numerous colors of nature by the different luminous ratio of regulating the red, green, blue three-color LED light emitting diode in the single pixel.Display devices such as comparative liquid crystal, PDP display, projection, have that color reducibility is good, brightness is high, the life-span is long, the response time is short, advantage such as energy-conserving and environment-protective, size can be regulated arbitrarily, be widely used in numerous public arenas such as airport, station, harbour, market, landmark, meeting, exhibition, performance, municipal square, stadiums at present.
But because the basic light-emitting component LED light emitting diode of LED display intrinsic brightness and discreteness of color wavelength when producing, even also be difficult to reach the in full accord of human eye acceptance by screening, have the even piebald phenomenon of brightness irregularities and irregular colour when causing present most display screen to dispatch from the factory.The homogenization of before some high-end producers adopt and dispatch from the factory each single module of forming screen being carried out brightness and colourity strictness is proofreaied and correct, and can significantly eliminate the piebald phenomenon, but exist calibration equipment cost an arm and a leg, to shortcomings such as adjustment environmental requirement harshness, adjustment efficient are low.
Existing adjusting process to LED display also exists another big not enough: after dispatching from the factory, along with the passing of service time, numerous LED on the display screen and module are because of attenuation characteristic difference separately, and piebald and bright phaeodium phenomenon can increase the weight of gradually.Mechanical displacement, the module that in addition shows module and casing expands with heat and contract with cold factor affecting such as distortion, dust and phenomenon stack such as the bright anyhow concealed wire that produces and zone be inhomogeneous, and display screen and preliminary phase are than having bigger decline aspect the display effect.According to above-mentioned former method, have only all modules of display screen are pulled down according to this, go back to factory and turn over the worker, readjust.Time-consuming, effort, general feasibility is little.
Application number is: 200810065151.X, name is called disclosed LED display corrective system of patent of invention and the method that a kind of LED display shows corrective system and bearing calibration, and is basic with identical with the said method thinking.
At present, also has a kind of method lower-cost, that only the luminance difference between the LED display luminous point is proofreaied and correct.Adopt the only LED display of the method for gamma correction of this kind, the consistance effect is better when showing red, green, blue list heavy shade.But when light-colored image such as screen demonstration human body complexion, sky, white wall significantly color spot will appear.Reason is that human eye is responsive all the more along with the color saturation reduction to color distortion.Application number is: 200810240296.9, and name is called disclosed means for correcting in a kind of patent of invention of device, system and method for on-site adjustment of LED display screen, system and method is basic identical with above method.This invention is adopted the LED large-size screen monitors is divided into some zonules, the method for gathering each regional LED brightness data respectively and handling.But during to each regional image data, because the acquisition angles of collecting device, position are all with different, this must cause an edges of regions to the saltus step of another edges of regions correction data, and it is the obviously striped anyhow of unit that final display screen can manifest with the pickup area.In addition, less when LED display pel spacing to be measured, when pixel is closeer, the interference between consecutive point will make that the method is difficult to carry out.
Summary of the invention
Technical matters to be solved by this invention is that the defective at above-mentioned prior art provides a kind of and can realize the disposable correction of LED whole screen on-site point-by-point YC, can see the corrective system and the bearing calibration of calibration result in real time, and the equipment needed thereby cost is low as far as possible, and is easy to operate.
For solving the problems of the technologies described above, the present invention realizes by the following technical solutions: at first, the whole screen of LED display on-site point-by-point YC calibration system is provided, this system comprises the LED display optical parameter acquisition equipment, controls and the parameter transmission equipment with display screen correction parameter treatment facility, display screen signal input that the LED display optical parameter acquisition equipment is connected in turn; Display screen signal input control and parameter transmission equipment also are connected with display screen correction calculation and screen body opertaing device and the two controls the demonstration of LED display screen body simultaneously.
Specifically, described LED display optical parameter acquisition equipment comprises that being used to obtain LED display shows the anti-digital camera of list of original LED YC relative different image information when red, green, blue is monochromatic and be used to obtain LED display the brightness of reality when showing red, green, blue, white monochrome and the light tone measuring instrument of color value.
Described display screen correction parameter treatment facility adopts the computing machine that correction parameter sampling and treatment conversion software and display screen Control Software are housed.
Described display screen signal input control and parameter transmission equipment comprise be used for to image carry out the Gamma conversion and to the FPGA (Field Programmable Gate Array) control circuit of view data dividing processing and the connected DVI decoding circuit that is used to receive display image signals and decoding, be used for the kilomega network output circuit and the SRAM memory circuit of signal output; Also comprise single chip circuit, export to the FPGA (Field Programmable Gate Array) control circuit after correction parameter data that single chip circuit reception display screen correction parameter treatment facility sends and the rough handling.
Described display screen correction calculation and screen body opertaing device comprise kilomega network input circuit and the connected FPGA (Field Programmable Gate Array) control circuit that is used for image secondary splitting, pointwise correction computing and gray scale generation and shows control, output buffering; Also comprise single chip circuit and connected Flash RAM and SRAM memory circuit, single chip circuit receives signal that the kilomega network input circuit imports and in conjunction with sending the FPGA (Field Programmable Gate Array) control circuit to after the rough handling of correction parameter data.
Cooperate above-mentioned corrective system, the present invention also provides the whole screen of cover LED display on-site point-by-point YC Calibration Method, and this method step is as follows:
(1) control LED display, light the array even spaced apart of a kind of color LED among the red, green, blue look LED on the described LED display, control first collecting device, obtain from the positive suitably distance of LED display and to comprise the described LED display view data that to light the original red, green, blue value of part single-point be rgb value information, described single-point is meant in pixel of LED display the set with color LED;
(2) repeating step (1) up to lighting on the described LED display all with a kind of LED of color, and obtains corresponding view data one by one by described control first collecting device;
(3) control LED display, light the array even spaced apart of other two kinds of color LED of LED display successively, repeat above step 1, step 2 repeatedly,, and control first collecting device and obtain corresponding view data one by one up to all LED that light on the described LED display;
(4) control LED display, light the red, green, blue LED on the LED display successively respectively, control second collecting device, obtain described LED display from the positive suitably distance of LED display and show that red, green, blue color and red, green, blue light the synthetic brightness and color value Yxy (measurement) value of reality when white monochromatic simultaneously;
(5) adopt display screen correction parameter treatment facility, import the original data set of above step (1), step (2), step (4) generation, and realize data set is read in queuing and processing successively automatically, with the spacing of setting serves as with reference to automatically every width of cloth data being looked for a sampling, in each sampling scope, all valid data are added up, to synthesize one group be the tables of data that comprises full frame all pixels of unit with the red, green, blue single-point to all data the most at last, the corresponding one group of rgb value of each single-point;
(6) with each single point R GB value, by the color space transformation mode, transfer brightness, chromaticity coordinates data to, it is Yxy (single-point) value, and calculate each monochromatic mean value, be Yxy (on average) value, Yxy (measurement) value that Yxy (on average) value and step (4) obtain is subtracted each other, obtain system deviation Δ Yxy (system) value;
(7) monochrome according to the field of video displaying standard reaches a white coordinate, and with reference to display screen LED attenuation degree to be measured, sets monochrome and white field desired value, i.e. Yxy (target) value of putting in order after screen is proofreaied and correct;
(8) Yxy (target) value of each Yxy (single-point) value that step (6) is obtained and step (7) is done the computing of color difference, also need eliminate system deviation Δ Yxy (system) value therebetween, finally obtains the correction coefficient Δ RGB of each single-point;
(9) by the described display screen correction parameter treatment facility of operation and display screen signal input control and parameter transmission equipment, the correction coefficient Δ RGB that step (8) is obtained sends and is stored to described display screen correction calculation and screen body opertaing device;
(10) described display screen correction calculation and screen body opertaing device will be finished the real-time digital image signal of Gamma conversion automatically with above-mentioned correction coefficient Δ RGB does matrix multiplication operation, generate the picture signal after the correction, export display screen to;
(11) described LED display shows according to the picture signal after the described correction.
Need to prove that situation or night that described step (1) needs not have strong illumination around LED display body to be corrected carry out under the environment.
Compared with the prior art, beneficial effect of the present invention is:
1) described system can realize that an adjustment of the on-the-spot whole screen of LED display finishes, processing cost, equipment cost have been reduced, can see effect immediately, thoroughly solve LED display piebald and the bright phaeodium phenomenon that the back produces of dispatching from the factory, and because of mechanical displacement, the module of module and casing expand with heat and contract with cold bright anyhow concealed wire that factor affecting such as distortion, dust produce and regional phenomenon such as inhomogeneous;
2) described system can realize that brightness point by point, chrominance synchronization proofread and correct, and accomplishes all pixel homogeneous of LED display, guarantees LED display uniformity all under all colours;
3) two collecting devices are used in combination, and make display screen after the correction accurately meet the brightness color requirement of desired value, have guaranteed calibration result;
4) the present invention adopts and the display screen luminous point to be divided into evenly some width of cloth are counted, shape is identical, the method of the mode image data of wrong array even spaced apart between the position, be no more than under the maximum magnitude that once collection is counted of first collecting device, when having avoided original subregion collection in worksite data, what cause because of the saltus step of edges of regions correction data is the obviously interference between striped and the consecutive point that reduce to cause because of pel spacing anyhow of unit with the pickup area, has further guaranteed calibration result.
Description of drawings
Accompanying drawing 1 is that the principle of the invention is formed schematic block diagram;
Accompanying drawing 2 is that display screen signal input control and parameter transmission equipment are formed schematic block diagram; Accompanying drawing 3 is that display screen correction calculation and screen body opertaing device are formed schematic block diagram;
Accompanying drawing 4-8 is the embodiment demonstration graph of the whole screen of LED display of the present invention on-site point-by-point YC Calibration Method.
Embodiment
For the ease of those skilled in the art's understanding, be further described in detail below in conjunction with specific embodiment and accompanying drawing principle to system and method for the present invention:
As shown in Figure 1, system of the present invention comprises LED display optical parameter acquisition equipment, display screen correction parameter treatment facility, display screen signal input control and parameter transmission equipment and display screen correction calculation and screen body opertaing device.
Wherein, described on-the-spot LED display optical parameter acquisition equipment is divided two parts: collecting device one is selected to be used to obtain display screen and is shown when red, green, blue is monochromatic the anti-digital camera of list of original LED YC relative different image information; The brightness of reality and the light tone measuring instrument of color value when collecting device two is selected to be used to obtain display screen demonstration red, green, blue, white monochrome, the purpose of the measured value of this equipment are that the image information that described collecting device one obtains is revised.Reason is: we are difficult to obtain accurate brightness of image and color absolute value by described collecting device just like parameters such as time shutter of digital camera, aperture, light attenuation coefficients.
Two image data of collecting device one and collecting device are input to display screen correction parameter treatment facility.Described display screen correction parameter treatment facility is the computing machine that correction parameter sampling and treatment conversion software and display screen Control Software are housed.This computing machine can be used for taking a sample automatically from the monochromatic original image information that above-mentioned collecting device one obtains, and reaching the measured value that obtains from collecting device two is that benchmark carries out data-switching, forms the acceptable pointwise correction supplemental characteristic of LED display.
Display screen correction parameter treatment facility is handled the data and the original reference data that collect and is obtained correction data, and flows to display screen signal input control and parameter transmission equipment.As Fig. 3, described display screen signal input control and parameter transmission equipment are made up of the software of hardware circuit and embedding, hardware circuit comprises DVI decoding circuit, Programmable Logic Device, SRAM circuit, single chip circuit, kilomega network output circuit composition, and software comprises the program that embeds in programmable logic controller (PLC) spare and the single-chip microcomputer.Described display screen signal input control and parameter transmission equipment are to be used for digital video signal input, image Gamma conversion, view data to cut apart, shield the LED that body controlled variable and correction data transmit and shield the prime opertaing device.This equipment also receives display image signals, and will flow to display screen correction calculation and screen body opertaing device behind display image signals and the correction parameter aggregation of data.
Described display screen correction calculation and screen body opertaing device are the LED display opertaing devices that is used for view data secondary splitting, pointwise correction matrix multiplication operation, gray scale demonstration control, signal output.As Fig. 4, this equipment is made up of the software of hardware circuit and embedding, hardware circuit comprises kilomega network input, output circuit, FPGA (Field Programmable Gate Array) control circuit, Flash RAM/SRAM memory circuit, single chip circuit, and software comprises the program that embeds in programmable logic device (PLD) and the single-chip microcomputer.
Described display screen correction calculation and screen body opertaing device will be finished the real-time digital image signal of Gamma conversion automatically and do matrix multiplication operation with the correction coefficient Δ RGB that calculates, generate the picture signal after proofreading and correct, export display screen to and show, realize proofreading and correct.
In the practical application, during the collecting device acquired signal, need around LED display body to be corrected, not have under the environment such as cloudy day of strong illumination or night and carry out.
Be the concrete execution embodiment that the present invention is based on the bearing calibration of above-mentioned corrective system execution below.
In the present embodiment, LED display to be measured is the LED display of 512*384 size, as shown in Figure 4.Wherein, red LED is numbered from R1/1 to R512/384, and green LED is numbered from G1/1 to R512/384, and blue led is numbered from B1/1 to B512/384, and each numbering score line left side is a columns, and the right is a line number.
Described collecting device one uses the high anti-digital camera of list of resolution, for reducing the distortion of image corner, joins telephoto lens; For increasing the time shutter to reduce measuring error, luminous intensity distribution attenuation standard eyeglass; For making things convenient for camera to fix, join the standard tripod.Described collecting device two uses standard hand-held light tone measuring instrument.
Described display screen correction parameter treatment facility uses the computing machine that correlation-corrected software and relevant interface are housed.
Concrete aligning step is as follows:
1) in suitable distant place, LED display dead ahead, over against LED display to be measured, adjustment camera angle, focal length make display screen to be measured be in the maximum magnitude of finding a view, and then camera are completely fixed with camera.
2) by display screen signal input control and parameter transmission equipment control LED display, light 1/4 even red LED array spaced apart earlier, that is: R1/1, R3/1, R5/1 ... R511/383 as shown in Figure 5, has the circle representative of dark mark to light LED among the figure.Take above-mentioned image after adjusting parameters such as camera aperture, shutter.Then, light successively as Fig. 6, Fig. 7, LED shown in Figure 8, and take pictures.Next by same procedure green, blue LED is taken pictures.More than operation is that software controlled in the corresponding calculated machine is finished by described display screen correction parameter treatment facility.
3) being provided with under the constant condition in brightness, is the light tone measuring instrument with collecting device two, the brightness and the color value of reality when measuring LED display demonstration red, green, blue, white monochrome; And measured value is input to the correction parameter treatment facility is in the corresponding calculated machine.
4) software in the described computing machine of operation, go out to put in order the correction coefficient of all single-points of screen according to above data computation, by display screen signal input control and parameter transmission equipment correction coefficient is transferred to the correction calculation and the screen body opertaing device of LED display side, and carry out it.
5) observe the LED display calibration result,, then send order, be stored in correction coefficient in the correction calculation of LED display side and the screen body opertaing device and in the EEPROMIC of final display unit as correctly.
Above-mentioned example considers that LED display is the 512*384 size, takes pictures and every kind of color LED is divided into four LED array of display.When other display resolution to be measured increases, under prerequisite evenly spaced apart, also can take pictures and time count to 16 times, 25 inferior by increase monochrome with quadrat method, be implemented in taking pictures to the whole screen of LED display in the maximum acquisition range of camera.
By above embodiment the present invention has been carried out further announcement, but scope of the present invention is not limited thereto.More than each element and equipment can replace with the similar or equivalent element that affiliated technical field personnel understand.
Need to prove, conceive under the prerequisite not breaking away from the present invention, any conspicuous variation that the method for the invention and system are done and be equal to replacement and all belong to protection scope of the present invention.
Claims (8)
1.LED the whole screen of display screen on-site point-by-point YC calibration system, comprise the LED display optical parameter acquisition equipment, it is characterized in that: also comprise the display screen correction parameter treatment facility, display screen signal input control and the parameter transmission equipment that are connected in turn with the LED display optical parameter acquisition equipment; Display screen signal input control and parameter transmission equipment also are connected with display screen correction calculation and screen body opertaing device and the two controls the demonstration of LED display screen body simultaneously.
2. the whole on-site point-by-point YC calibration system of shielding of LED display according to claim 1 is characterized in that: described LED display optical parameter acquisition equipment comprises that being used to obtain LED display shows the collecting device one of original LED YC relative different image information when red, green, blue is monochromatic and be used to obtain LED display the brightness of reality when showing red, green, blue, white monochrome and the collecting device two of color value.
3. the whole screen of LED display according to claim 2 on-site point-by-point YC calibration system, it is characterized in that: described collecting device one adopts single anti-digital camera, and collecting device two adopts the light tone measuring instrument.
4. the whole screen of LED display according to claim 1 on-site point-by-point YC calibration system is characterized in that: described display screen correction parameter treatment facility adopts the computing machine that correction parameter sampling and treatment conversion software, display screen Control Software are housed.
5. the whole screen of LED display according to claim 1 on-site point-by-point YC calibration system is characterized in that: described display screen signal input control and parameter transmission equipment comprise be used for to image carry out the Gamma conversion and to the FPGA (Field Programmable Gate Array) control circuit of view data dividing processing and the connected DVI decoding circuit that is used to receive display image signals and decoding, be used for the kilomega network output circuit and the SRAM memory circuit of signal output; Also comprise single chip circuit, export to the FPGA (Field Programmable Gate Array) control circuit after correction parameter data that single chip circuit reception display screen correction parameter treatment facility sends and the rough handling.
6. the whole screen of LED display according to claim 1 on-site point-by-point YC calibration system is characterized in that: described display screen correction calculation and screen body opertaing device comprise kilomega network input, circuit and the connected FPGA (Field Programmable Gate Array) control circuit that is used for image secondary splitting, pointwise correction computing and gray scale generation and shows control, output buffering; Also comprise single chip circuit and connected Flash RAM and SRAM memory circuit, single chip circuit receives signal that the kilomega network input circuit imports and in conjunction with sending the FPGA (Field Programmable Gate Array) control circuit to after the rough handling of correction parameter data.
7.LED the whole screen of display screen on-site point-by-point YC calibration steps, step is as follows:
(1) control LED display, light the array even spaced apart of a kind of color LED among the red, green, blue look LED on the described LED display, control collecting device one, obtain from the positive suitably distance of LED display and to comprise the described LED display view data that to light the original red, green, blue value of part single-point be rgb value information, described single-point is meant in pixel of LED display the set with color LED;
(2) repeating step (1) up to lighting on the described LED display all with a kind of LED of color, and obtains corresponding view data one by one by described control collecting device one;
(3) control LED display, light the array even spaced apart of other two kinds of color LED of LED display successively, repeat above step (1), step (2) repeatedly, up to all LED that light on the described LED display, and control collecting device one obtains corresponding view data one by one;
(4) control LED display, light the red, green, blue LED on the LED display successively respectively, control collecting device two obtains described LED display from the positive suitably distance of LED display and shows that red, green, blue color and red, green, blue light the synthetic brightness and color value Yxy (measurement) value of reality when white monochromatic simultaneously;
(5) adopt display screen correction parameter treatment facility, import the original data set of above step (1), step (2), step (3), step (4) generation, and realize data set is read in queuing and processing successively automatically, with the spacing of setting serves as with reference to automatically every width of cloth data being looked for a sampling, in each sampling scope, all valid data are added up, to synthesize one group be the tables of data that comprises full frame all pixels of unit with the red, green, blue single-point to all data the most at last, the corresponding one group of rgb value of each single-point;
(6) with each single point R GB value, by the color space transformation mode, transfer brightness, chromaticity coordinates data to, it is Yxy (single-point) value, and calculate each monochromatic mean value, be Yxy (on average) value, Yxy (measurement) value that Yxy (on average) value and step (4) obtain is subtracted each other, obtain system deviation Δ Yxy (system) value;
(7) monochrome according to the field of video displaying standard reaches a white coordinate, and with reference to display screen LED attenuation degree to be measured, sets monochrome and white field desired value, i.e. Yxy (target) value of putting in order after screen is proofreaied and correct;
(8) Yxy (target) value of each Yxy (single-point) value that step (6) is obtained and step (7) is done the computing of color difference, also need eliminate system deviation Δ Yxy (system) value therebetween, finally obtains the correction coefficient Δ RGB of each single-point;
(9) by the described display screen correction parameter treatment facility of operation and display screen signal input control and parameter transmission equipment, the correction coefficient Δ RGB that step (8) is obtained sends and is stored to described display screen correction calculation and screen body opertaing device;
(10) described display screen correction calculation and screen body opertaing device will be finished the real-time digital image signal of Gamma conversion automatically with above-mentioned correction coefficient Δ RGB does matrix multiplication operation, generate the picture signal after the correction, export display screen to;
(11) described LED display shows according to the picture signal after the described correction.
8. calibration steps according to claim 7 is characterized in that: situation or night that described step (1) needs not have strong illumination around LED display body to be corrected carry out under the environment.
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-
2009
- 2009-09-01 CN CN2009101920058A patent/CN101692326B/en not_active Expired - Fee Related
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