CN101923825B - Regional correction method for planar lighting device - Google Patents
Regional correction method for planar lighting device Download PDFInfo
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- CN101923825B CN101923825B CN201010236942A CN201010236942A CN101923825B CN 101923825 B CN101923825 B CN 101923825B CN 201010236942 A CN201010236942 A CN 201010236942A CN 201010236942 A CN201010236942 A CN 201010236942A CN 101923825 B CN101923825 B CN 101923825B
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Abstract
The invention discloses a regional correction method for a planar lighting device, which comprises the following steps: A1: illuminating the planar lighting device according to primary colors, and respectively acquiring the regional image of each primary color by using an imaging device; A2: analyzing and processing the image information to obtain the regional average luminance information and/or regional average chromatic information; A3: obtaining the regional correction coefficient according to the preset target parameter and the regional average luminance information and/or regional average chromatic information; and A4: downloading and storing the regional correction coefficient into a storage device.
Description
Technical field
The present invention relates to planar lighting device alignment technique field, in particular a kind of regional correction method for planar lighting device.
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. like 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 let 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 and step back in the plurality of applications occasion.
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 ground, 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 need carry out the pixel pointwise correction to LED display, comprises colourity adjustment and brightness adjustment.
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, and this system adopts the imaging device 2 of specialty; Light gun 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; And download to and send card 4, when each start-up system, through upper computer software; Be sent to 5 pairs of LED displays of scan control card and proofread and correct, realize the brightness of each pixel and the correction of colourity.
Its bearing calibration is:
(1) use professional optical device to obtain the brightness and the colorimetric parameter of module/casing/screen body;
(2) use professional software to carry out analytical calculation, obtain corrected value, form correction file;
(3) download in transmission card or the receiving card through order wire, and be saved to the I2C chip;
When (4) scanning card powers on, read the correction file in the I2C chip; The scanning card control chip carries out brightness and chromaticity correction by corresponding correcting algorithm to each pixel.
As can beappreciated from fig. 1; Its imaging device 2 is placed on optimal position, promptly is right against the center of display screen, obviously; Be difficult to satisfy such image-forming condition in the middle of the application; Because most screen positions are higher, all be in the high-altitude of tens meters even tens meters, be difficult to imaging device is placed the geometric center position in its dead ahead.
And comparatively general situation is the image-forming condition shown in Fig. 2; Imaging device, for example camera is positioned at the height place of tens meters of lower right or the lower lefts of display screen, and display screen is taken pictures; The photo that obtains like this is inevitable as shown in Figure 3; Be the warp image of non-regular borders, and for how using the image parameter that obtains in this case to proofread and correct, prior art does not relate to then.
Therefore, there is defective in prior art, needs to improve.
Summary of the invention
Technical matters to be solved by this invention is the deficiency to prior art, and a kind of regional correction method for planar lighting device is provided.
Technical scheme of the present invention is following:
A kind of regional correction method of planar lighting device comprises:
A1: divide primary colours to light said planar lighting device, the image information of using imaging device to gather each primary colours respectively;
A2: the said image information of analyzing and processing, choose at least one zone, obtain the zone leveling information in said zone; Wherein, said zone leveling information is zone leveling monochrome information and/or zone leveling chrominance information;
A3:, obtain the regional correction coefficient according to pre-seting target component and said zone leveling information;
A4: memory storage is downloaded and/or be stored in to said regional correction coefficient.
Be applied to example, described regional correction method, further comprising the steps of after the said steps A 4: as to use the video data of the said planar lighting device of said regional correction coefficient correction, use the video data after proofreading and correct to drive said planar lighting device.
Be applied to above-mentioned each example, described regional correction method, said minute primary colours are lighted the method for operating of said planar lighting device and are: make said planar lighting device exhibit red, green, blueness respectively.
Be applied to above-mentioned each example, described regional correction method, said steps A 2 may further comprise the steps:
A21: several regions cut-point and the several boundary point of confirming said planar lighting device;
A22: the pixel of lighting in the said planar lighting device corresponding each said cut-point and said frontier point; Gather dot matrix image; Adopt a certain pixel of being lighted in the said dot matrix image for reference to initial point, obtain the relative coordinate of each pixel of being lighted in the said dot matrix image;
A23:, obtain to cut apart zone leveling monochrome information and/or the zone leveling chrominance information that obtains by said Region Segmentation point and said frontier point according to the relative coordinate of each said pixel.
Be applied to example, described regional correction method, said frontier point comprises the summit of said planar lighting device.Preferably, it is said with reference to initial point adopting arbitrary said summit.
Be applied to above-mentioned each relevant example, described regional correction method, said frontier point comprise the border mid point of said planar lighting device.
Be applied to above-mentioned each relevant example, described regional correction method, said planar lighting device adopts the LED display with regular borders.
Be applied to example, described regional correction method, said cut-point and frontier point are divided into some rectangles with said LED display; Perhaps, described regional correction method, said cut-point and frontier point are divided into some triangles with said LED display.
Adopt such scheme, the present invention obtains this regional average optical parameter through the subregion, carries out regional correction to this zone, thereby has improved the regional correction effect of LED display and the whole calibration result of LED display.
Description of drawings
Fig. 1 is the prior art system structural representation;
Fig. 2 is that the position of camera and display screen concerns synoptic diagram in the existing alignment technique;
Fig. 3 takes the photo shape synoptic diagram that obtains in the existing alignment technique;
Fig. 4 is the synoptic diagram of Flame Image Process in the inventive method.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is elaborated.
Present embodiment provides a kind of regional correction method for planar lighting device, is example with the LED display, and this method mainly may further comprise the steps:
A1: share out bonus, green, blue primary lights LED display, uses for example camera of imaging device, video camera etc. are gathered the area image of each primary colours respectively; Can certainly select to use imaging device to gather the image under the display screen white balance state.
A2: the image information that the step obtains on the analyzing and processing obtains zone leveling monochrome information and/or zone leveling chrominance information; For example obtain each regional RGB half-tone information, calculate average luminance information and zone leveling chrominance information according to half-tone information.
A3: obtain the regional correction coefficient according to pre-seting target component and said zone leveling monochrome information and/or zone leveling chrominance information; After system building finishes; Target component is set in system, and the result parameter after promptly proofreading and correct can be provided with a plurality of target components; Calculate the correction coefficient that obtains the zone according to above-mentioned zone average luminance information and/or zone leveling chrominance information then; For example can adopt methods such as the method for making up the difference, counting backward technique, index method, integral method, three primary colours tristimulus values method to calculate; For instance; It is 7500cd that target white brightness parameter is set; And the average white brightness of current region of actual measurement is 8000cd, can current brightness be obtained 7500cd through making difference, also can current brightness be obtained the target white brightness through multiply by a fixed numbers; This fixed numbers is said correction coefficient.
A4: said regional correction coefficient storage in memory storage, perhaps, is downloaded said regional correction coefficient and be stored in memory storage, for example can download to main frame, also can download in the storage chip of scanning card etc.
An example is, after steps A 4, uses the video data of the said planar lighting device of said regional correction coefficient correction, uses the video data after proofreading and correct to drive said planar lighting device, thereby realized the regional correction function.On this basis, just can realize the integral body of LED display is proofreaied and correct, and obtain better calibration result.
Display screen in the present embodiment also can be other forms of display screen, is not limited only to LED display.
Present embodiment provides the concrete operation method of steps A 2 described in a kind of embodiment 1, may further comprise the steps:
A21: Region Segmentation point and the frontier point of confirming said LED display; As shown in Figure 4; Be a rectangle LED display, confirm that four frontier points of this display screen are rectangle summit A, B, C, D, confirm the Region Segmentation point; Comprise all the other cut-points on A1, B1, C1, D1 and AB, AD, BC, the CD limit etc., whole 30 points shown in circle among Fig. 4; Need to prove except the whole points shown in the circle, between each circle, to also have perhaps and have many pixels, these pixels are not shown in Fig. 4.
A22: the control LED display is lighted the pixel of each said cut-point and said frontier point in the said planar lighting device, and display screen presents the image of a formation, the image of as shown in Figure 45 * 6 some formation; Use camera to gather this dot matrix image, adopt a certain pixel of being lighted in the said dot matrix image, obtain the relative coordinate of each pixel of being lighted in the said dot matrix image for reference to initial point; It for example is example with Fig. 4; Can adopt the A point to be true origin, promptly with reference to initial point, at this moment; With reference to the A point, analyze successively and obtain the coordinate data that all the other each points are ordered with respect to A; Perhaps, be true origin with the A1 point, analyze successively and all put the coordinate data of ordering with respect to A1.Preferably, said frontier point comprises the summit of said planar lighting device, and at this moment, it is said with reference to initial point can adopting arbitrary said summit, is example with Fig. 4, and can adopt A point, B point, C point or D point is with reference to initial point.And for example, said frontier point comprises the border mid point of said planar lighting device, and for example, planar lighting device has 5 limits, and then said frontier point comprises the mid point on each bar limit.
A23: according to the relative coordinate of each the said pixel that obtained in the last step; Zone leveling monochrome information and/or the zone leveling chrominance information that obtains cut apart in acquisition by said Region Segmentation point and said frontier point; After for example obtaining the pixel relative coordinate information of position of summit and cut-point; Can obtain for zone leveling monochrome information and/or zone leveling chrominance information to the rectangle of angle point with 2 of A, A1, the zone leveling monochrome information and/or the zone leveling chrominance information of all the other each rectangular areas also can obtain.So just realize on the distortion photo, confirming the average luminance information and/or the zone leveling chrominance information in zone in the display screen, solved unavoidable distortion photo handling problem in the trimming process.
Preferably, above-mentioned LED display is the LED display of regular borders, and another example, above-mentioned frontier point can also comprise the border mid point on each bar limit of LED display.
Preferably, use above-mentioned cut-point and frontier point that said LED display is divided into some rectangles.Perhaps, use above-mentioned cut-point and frontier point that said LED display is divided into some triangles.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection domain of accompanying claims of the present invention according to above-mentioned explanation.
Claims (9)
1. the regional correction method of a planar lighting device is characterized in that, comprising:
A1: divide primary colours to light said planar lighting device, the image information of using imaging device to gather each primary colours respectively;
A2: the said image information of analyzing and processing, choose at least one zone, obtain the zone leveling information in said zone; Wherein, said zone leveling information is zone leveling monochrome information and/or zone leveling chrominance information;
Said A2 may further comprise the steps:
A21: several regions cut-point and the several boundary point of confirming said planar lighting device;
A22: the pixel of lighting in the said planar lighting device corresponding each said cut-point and said frontier point; Gather dot matrix image; Adopt a certain pixel of being lighted in the said dot matrix image for reference to initial point, obtain the relative coordinate of each pixel of being lighted in the said dot matrix image;
A23:, obtain to cut apart zone leveling monochrome information and/or the zone leveling chrominance information that obtains by said Region Segmentation point and said frontier point according to the relative coordinate of each said pixel;
A3: according to pre-seting target component and said zone leveling information, the regional correction coefficient that obtains being used to carry out regional correction;
A4: with said regional correction coefficient storage in memory storage.
2. regional correction method according to claim 1; It is characterized in that; Also carry out following steps after the said A4: use the video data of the said planar lighting device of said regional correction coefficient correction, use the video data after proofreading and correct to drive said planar lighting device.
3. regional correction method according to claim 1 and 2 is characterized in that, said minute primary colours are lighted the method for operating of said planar lighting device and are: make said planar lighting device exhibit red, green, blueness respectively.
4. regional correction method according to claim 1 is characterized in that said frontier point comprises the summit of said planar lighting device.
5. regional correction method according to claim 4 is characterized in that, it is said with reference to initial point adopting arbitrary said summit.
6. regional correction method according to claim 1 is characterized in that, said frontier point comprises the border mid point of said planar lighting device.
7. regional correction method according to claim 1 is characterized in that, said planar lighting device adopts the LED display with regular borders.
8. regional correction method according to claim 7 is characterized in that said cut-point and frontier point are divided into some rectangles with said LED display.
9. regional correction method according to claim 7 is characterized in that said cut-point and frontier point are divided into some triangles with said LED display.
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| CN103106856A (en) * | 2011-11-14 | 2013-05-15 | 沈阳火炬北泰数码科技有限责任公司 | Debugging system of liquid crystal displayer and debugging method of the liquid crystal displayer |
| CN103824544B (en) * | 2014-02-28 | 2015-12-09 | 西安诺瓦电子科技有限公司 | The bearing calibration of LED display, Apparatus and system |
| CN104279958B (en) * | 2014-10-24 | 2017-07-21 | 西安诺瓦电子科技有限公司 | LED display locus detection method and system for instructing correction |
| CN105185302B (en) * | 2015-08-28 | 2018-01-09 | 西安诺瓦电子科技有限公司 | Lamp position deviation modification method and its application between monochrome image |
| CN105185315B (en) * | 2015-10-13 | 2018-01-12 | 西安诺瓦电子科技有限公司 | LED display uniformity correcting method |
| CN107507558B (en) * | 2017-06-27 | 2019-12-27 | 深圳市灵星雨科技开发有限公司 | Correction method of LED display screen |
| CN108735144A (en) * | 2018-05-24 | 2018-11-02 | 长春希达电子技术有限公司 | A kind of non-point-by-point acquisition correction method of LED display |
| CN110831276B (en) * | 2019-11-14 | 2021-08-24 | 上海闻泰信息技术有限公司 | LED-based lamplight brightness control method and related device |
| CN113327544B (en) * | 2021-08-04 | 2021-10-19 | 卡莱特云科技股份有限公司 | LED display screen contrast improving method based on diagonal display and LED display screen |
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| JP3888425B2 (en) * | 2001-08-07 | 2007-03-07 | セイコーエプソン株式会社 | Image processing system, image display device, program, information storage medium, and image processing method |
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| CN101202015A (en) * | 2007-08-22 | 2008-06-18 | 深圳市同洲电子股份有限公司 | Lightness data obtaining method and device for gamma correction of LED |
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