CN105788499A - LED display screen point-to-point brightness and chroma correction method based on constant-temperature CCD camera - Google Patents
LED display screen point-to-point brightness and chroma correction method based on constant-temperature CCD camera Download PDFInfo
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- CN105788499A CN105788499A CN201610272140.3A CN201610272140A CN105788499A CN 105788499 A CN105788499 A CN 105788499A CN 201610272140 A CN201610272140 A CN 201610272140A CN 105788499 A CN105788499 A CN 105788499A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention provides an LED display screen point-to-point brightness and chroma correction method based on a constant-temperature CCD camera. The method comprises the steps of correcting a system, setting LED screen connecting parameters, performing area-to-area point-to-point data acquisition, performing data calculation and exporting a correction coefficient file, generating a correction coefficient picture and performing feedback to an LED control system, and performing different driving on pixels. The LED display screen point-to-point brightness and chroma correction method is advantageous in that only one minute is required for uploading a correction coefficient to the LED control system, greatly accelerating large-screen correction in engineering, and effectively improving color uniformity and color fidelity of the LED display screen.
Description
Technical field
The invention belongs to LED display alignment technique field, particularly relate to a kind of LED display brightness point by point chromaticity correction method based on constant temperature CCD camera.
Technical background
LED display relatively traditional LC D, DLP, it is possible to arbitrarily splice, area is bigger, and visual angle is wider, and also more eye-catching, visual impact is also higher；Except large-size screen monitors advantage, outdoor full color LED display screen, image quality high definition, rich color is gorgeous, and fine and smooth degree is also more and more higher.LED display itself has power savings advantages, and brightness Automatic adjusument technology reduces energy consumption further, reduces night-tune light pollution simultaneously, meets national energy-saving and reduces discharging environmental protection concept, has further speeded up the extensive use of LED technology.
Ideally, LED display is uniform, and the brightness of the light that each pixel sends on unspecified angle, colourity are always consistent.And in actual production process, the uniformity of display screen can be subject to LED self and there is the diversity in brightness, colourity；LED display manufacture process flatness；Module heat radiation uneven distribution；LED brightness Natural Attenuation, and the impact of the factors such as all lamp attenuation degrees are inconsistent, so not having the uniformity of the LED display of correction to be unable to reach desirable level, there is obvious gap in image quality compared with other flat panel displays.
Prior art uses common CCD image device, there is certain time drift temperature drift problem, and LED large-size screen monitors data acquisition needs 0.1-1 hour, and temperature drift problem affects CCD image quality significantly, reduces each LED certainty of measurement and the degree of stability of subregion measurement.
Existing correction of typist's errors coefficient uploads control system, is all that casing individual element point is uploaded one by one, and uploading speed is slow, and along with the change of LED large-size screen monitors area is big, uploading the correction coefficient time generally requires several hours, increases engineering site correction difficulty.
Summary of the invention
The present invention is directed to above technical problem, it is provided that a kind of LED display brightness point by point colourity method for quickly correcting based on constant temperature CCD camera, greatly improve the speed of large-size screen monitors correction.
The technical solution used in the present invention is as follows, a kind of LED display brightness point by point chromaticity correction method based on constant temperature CCD camera, it is characterised in that comprise the following steps:
Correction system hardware connects, and carries out system compensation: connecting light-emitting diode display, LED control system, install constant temperature CCD camera, camera is placed on large-size screen monitors dead ahead 10-30m place, is connected to LED and controls computer；
LED display cabling mode is set, band load parameter, make large-size screen monitors normally show；
Arranging screen body partitioned parameters, adjust camera, make lamp plate pixel blur-free imaging, pointwise gathers data district by district successively；
Data process corrected Calculation, derive full frame correction coefficient file；
According to screen body trace-diagram, generate correction coefficient picture, play correction coefficient picture, be uploaded to LED control system by video interface；
LED control system intercepts correction picture coefficient of correspondence, according to correction coefficient, each pixel is carried out diversity driving；
Preferably, described LED control system is made up of sending card and multiple receiving card cascades, and LED controls computer and is connected to sending card, and sending card connects receiving card by netting twine, is connected by netting twine between each receiving card.
Preferably, described correction coefficient picture format is 24bitbmp, and photo resolution is consistent with LED display resolution.
Preferably, correction coefficient picture is uploaded LED control system step and is: a, transmission order, starts correction coefficient and uploads LED control system；B, loop play correction coefficient picture.
The present invention uses constant temperature high resolution CCD imaging technique, the YC data of each lamp of the metastable measurement of high-efficiency precision by making correction picture by correction coefficient, and adopt DVI video channel multiplexing port to transmit correction picture, thoroughly break correction coefficient and upload to the speed bottle-neck controlling card, make the LED screen of arbitrary resolution, including various closely spaced light-emitting diode displays, complicated special-shaped LED display, correction coefficient uploads to the LED control system time only needs 1 minute, greatly accelerate large-size screen monitors correction in engineering, effectively promote the LED display light tone uniformity and color fidelity.
Accompanying drawing explanation
Fig. 1 is the block diagram of the present invention.
Fig. 2 is the correction system hardware connection figure of the present invention.
Fig. 3 is correction coefficient uploading step.
Fig. 4 is LED control system schematic diagram.
Detailed description of the invention
Illustrate below in conjunction with accompanying drawing, the present invention is introduced in detail, it will be appreciated that following is introduce the specific embodiment of the present invention, and does not lie in restriction protection scope of the present invention.
For LED full-color screen display screen, a LED pixel point generally includes red R, green G and blue tri-kinds of colors of B and constitutes, and double; two or monochromatic LED display screen is then only comprised to two kinds or a kind of color of correspondence.
Constant temperature CCD camera, adopt high-performance large area CCD device, special low noise drive circuit, the Refrigeration Technique of miniaturization low-power consumption and special refrigerating chamber structure, there is good temperature noise characteristic, use constant temperature CCD camera, it is ensured that subregion corrects the high accuracy of collecting measurement data in batches with good degree of stability.Single acquisition lamp can be increased count, be effectively improved the whole screen acquisition speed of LED display.
Shown in accompanying drawing 1, a kind of LED display brightness point by point chromaticity correction method based on constant temperature CCD camera, concrete comprises the following steps:
, carry out system compensation, the system of correction includes: LED display, LED control system, LED screen controls computer, constant temperature CCD camera, before system compensation, carry out system connection, install constant temperature CCD camera, then large-size screen monitors dead ahead is placed the cameras at, it is preferably placed at 10 meters of of large-size screen monitors dead ahead, certainly, can can adjust flexibly with situations such as positions according to the size of screen, it is typically in 10-30m position, connect LED display, LED control system, camera connects LED screen with USB and controls computer, as shown in Figure 2, sent by computer and control camera order, camera is by being acquired the brightness of each pixel region on LED display and/or chroma data.
, LED display casing cabling mode is set, each casing band loading point number is set, makes large-size screen monitors normally show.
, screen body partitioned parameters is set, camera technique parameter is set, controls computer preview photograph according to LED, adjust camera, make imaging size be near the mark size；Imaging size adjustment is to after suitable size, then regulates focusing, makes lamp plate pixel blur-free imaging, camera successively district by district pointwise gather data.
, LED control computer data are processed corrected Calculation, derive full frame correction coefficient file, for various Small Distance light-emitting diode displays, complicated special-shaped LED display, LED controls computer energy Intelligent Recognition LED lamp bead, it is achieved to pickup area lamp bead coordinate modification, YC data correction.
The colour measurement of LED display uses CIEXYZ1931 standard colorimetric system with calculating, by color gamut space intrinsic for LED display being transformed into target color gamut that user sets spatially, it is achieved the correction of the chroma luminance of LED display.
LED controls computer and collection photo data is carried out coordinate modification, and data process, it is determined that LED display original color gamut space tristimulus values matrix；
LED controls computer and determines target color gamut space tristimulus values matrix；
LED controls computer according to formula: conversion coefficient matrix * original color gamut space tristimulus values matrix=target color gamut space tristimulus values matrix.
Conversion coefficient matrix=Tristimulus values matrix * original color gamut space ,=target color gamut space tristimulus values matrix-1.
, according to screen body trace-diagram, load correction file coefficient, generate the correction coefficient picture of 24bitbmp, the resolution of correction coefficient picture is consistent with LED display resolution, plays correction coefficient picture, is uploaded to LED control system by video interface, specifically as shown in Figure 3, including, a, LED control computer and send a command to LED control system, start correction coefficient and upload LED control system；B, LED control computer circulation and play correction coefficient picture frame by frame, correction coefficient picture is uploaded to LED control system by video interface, such as by DVI, HDMI and VGA etc., transmission speed only has only to one minute, and the correction coefficient that breaks traditions uploads to the speed bottle-neck controlling card.
LED control system is accepted card cascade by sending card with multiple and forms, as shown in Figure 4, LED is controlled computer and video data is sent to by video interface the sending card of LED control system, sending card connects receiving card by netting twine, connected by netting twine between each receiving card, sending card gathers HD video data, is packaged into network packet, is sent to each and accepts card.
6), LED control system intercepts correction picture coefficient of correspondence, namely receiving card obtains the correction coefficient with loading point region, i.e. conversion coefficient matrix, LED control system by by video source signal pixel-by-pixel with conversion coefficient matrix real-time operation, each pixel difference is driven, it is achieved LED display chroma luminance corrects.
Further, the present invention uses constant temperature high resolution CCD imaging technique, reduce drift problem during temperature drift, large-size screen monitors data acquisition time is few, the YC data of each lamp of the metastable measurement of high-efficiency precision by making correction picture by correction coefficient, make the LED screen of arbitrary resolution, including various closely spaced light-emitting diode displays, complicated special-shaped LED display, correction coefficient uploads to the LED control system time only needs 1 minute, greatly accelerate large-size screen monitors correction in engineering, reduce the difficulty of straightened up in place, effectively promote the LED display light tone uniformity and color fidelity..
Embodiments of the invention simply introduce its detailed description of the invention, do not lie in and limit its protection domain.The technical staff of the industry may be made that some is revised under the inspiration of the present embodiment, therefore all equivalences done according to the scope of the claims of the present invention change or modify, and belong within the scope of Patent right requirement of the present invention.
Claims (4)
1. the LED display brightness point by point chromaticity correction method based on constant temperature CCD camera, it is characterised in that comprise the following steps:
1) correction system hardware connects, and carries out system compensation: connecting light-emitting diode display, LED control system, install constant temperature CCD camera, camera is placed on large-size screen monitors dead ahead 10-30m place, is connected to LED and controls computer；
2) LED display cabling mode is set, band load parameter, make large-size screen monitors normally show；
3) arranging screen body partitioned parameters, adjust camera, make lamp plate pixel blur-free imaging, pointwise gathers data district by district successively；
4) data process corrected Calculation, derive full frame correction coefficient file；
5) according to screen body trace-diagram, generate correction coefficient picture, play correction coefficient picture, by being uploaded to LED control system by video interface；
6) LED control system intercepts correction picture coefficient of correspondence, according to correction coefficient, each pixel is carried out diversity driving.
2. a kind of LED display brightness point by point chromaticity correction method based on constant temperature CCD camera according to claim 1, it is characterized in that, described LED control system is made up of sending card and multiple receiving card cascades, LED controls computer and is connected to sending card, sending card connects receiving card by netting twine, is connected by netting twine between each receiving card.
3. a kind of LED display brightness point by point chromaticity correction method based on constant temperature CCD camera according to claim 1, it is characterised in that described correction coefficient picture format is 24bitbmp, and photo resolution is consistent with LED display resolution.
4. a kind of LED display brightness point by point chromaticity correction method based on constant temperature CCD camera according to claim 1, it is characterised in that correction coefficient picture is uploaded LED control system step and is: a, transmission order, start correction coefficient and upload LED control system；B, loop play correction coefficient picture.
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| CN201610272140.3A CN105788499A (en) | 2016-04-28 | 2016-04-28 | LED display screen point-to-point brightness and chroma correction method based on constant-temperature CCD camera |
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| CN201610272140.3A CN105788499A (en) | 2016-04-28 | 2016-04-28 | LED display screen point-to-point brightness and chroma correction method based on constant-temperature CCD camera |
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Cited By (5)
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| CN108538246A (en) * | 2018-04-20 | 2018-09-14 | 京东方科技集团股份有限公司 | Display screen matrix data capture method and device, pixel compensation method and system |
| CN112233570A (en) * | 2020-12-16 | 2021-01-15 | 卡莱特（深圳）云科技有限公司 | Arc screen correction method and device, computer equipment and storage medium |
| CN112614472A (en) * | 2020-08-31 | 2021-04-06 | 西安诺瓦星云科技股份有限公司 | Display unit brightness adjusting method, device and system |
| CN112614460A (en) * | 2020-11-26 | 2021-04-06 | 西安诺瓦星云科技股份有限公司 | Method and device for sending correction coefficient, storage medium and processor |
| CN113257181A (en) * | 2021-06-29 | 2021-08-13 | 卡莱特云科技股份有限公司 | LED screen correction image acquisition method, correction method, acquisition device and correction system |
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| CN108538246A (en) * | 2018-04-20 | 2018-09-14 | 京东方科技集团股份有限公司 | Display screen matrix data capture method and device, pixel compensation method and system |
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| CN112233570B (en) * | 2020-12-16 | 2021-04-02 | 卡莱特（深圳）云科技有限公司 | Arc screen correction method and device, computer equipment and storage medium |
| CN113257181A (en) * | 2021-06-29 | 2021-08-13 | 卡莱特云科技股份有限公司 | LED screen correction image acquisition method, correction method, acquisition device and correction system |
| CN113257181B (en) * | 2021-06-29 | 2021-10-22 | 卡莱特云科技股份有限公司 | LED screen correction image acquisition method, correction method, acquisition device and correction system |
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