CN108305294A - A kind of camera image curved surface method for precisely marking with grid target - Google Patents
A kind of camera image curved surface method for precisely marking with grid target Download PDFInfo
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- CN108305294A CN108305294A CN201810051122.1A CN201810051122A CN108305294A CN 108305294 A CN108305294 A CN 108305294A CN 201810051122 A CN201810051122 A CN 201810051122A CN 108305294 A CN108305294 A CN 108305294A
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- brightness
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- sampling area
- curved surface
- viewing field
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/80—Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
Abstract
The present invention relates to a kind of camera image curved surface method for precisely marking with grid target, this method are as follows：Display unit is divided into the grid of X × Y, light the sampling area centered on grid joint and is corrected so that sampling area all pixels brightness is identical；The three primary colours of each sampling area all pixels are lighted successively and hot spot carries out gamma correction as a whole by entire sampling area so that all hot spot brightness are identical on display unit；It uses camera to acquire the brightness of all hot spots and carries out interpolation arithmetic using each hot spot brightness data as sampled point brightness data, obtain camera effective viewing field full luminance data；Being compensated to camera effective viewing field brightness data keeps all brightness datas identical, completes the calibration of camera image curved surface.The present invention can be distorted the synthesis curved surface of camera effective viewing field different location and be modified, and obtain true effective viewing field's plane.
Description
Technical field：
The invention belongs to dot matrix display technical fields, are related to a kind of optical camera acquisition image calibration method.
Background technology：
It is to pass through industrial camera currently to lead LED display alignment technique to be applied（CCD or CMOS）, or single anti-civilian phase
Machine and mobile phone shooting acquire display screen point by point, and the red-green-blue obtained on display screen per LED lamp bead is relatively bright
Angle value, by achieving the purpose that screen uniformity calibration to being modified per the red-green-blue of LED lamp bead on display screen.
But camera acquisition correction is all inevitably generated a variety of distortions such as the distance distortion, visual angle distortion, Boundary Distortion of flatness,
It is in some form of curved surface rather than a plane to make correction result, display effect after extreme influence correction.
Invention content：
The technical problem to be solved in the present invention is to provide a kind of camera image curved surface method for precisely marking with grid target, the party
Method can be distorted the synthesis curved surface of camera effective viewing field different location and be modified, and obtain true effective viewing field's plane.
In order to solve the above-mentioned technical problem, the camera image curved surface method for precisely marking of the invention with grid target includes
Following step：
Step 1: display unit to be divided into the grid of X × Y, chosen using centered on grid joint N × N pixel regions as
Sampling area；
Step 2: lighting all pixels of each sampling area and being corrected to each pixel intensity so that all pictures of sampling area
Plain brightness is identical；
Step 3: some primary colours luminescence chip of each sampling area all pixels is lighted, and using entire sampling area as one
A entirety acquires 5 brightness of hot spot of entire sampling area with luminance meter and carries out hot spot overall brightness correction so that display unit
Upper all hot spot brightness are identical；
Step 4: lighting each sampling area all pixels and acquiring the brightness of all hot spots with camera, with each hot spot brightness data
Interpolation arithmetic is carried out as sampled point brightness data, obtains camera effective viewing field full luminance data, at this time camera effective viewing field
A curved surface is presented in brightness data；
Step 5: being compensated to camera effective viewing field brightness data keeps all brightness datas identical, camera effective viewing field at this time
A plane is presented in image；
Step 6: lighting the another two primary colours luminescence chip of each sampling area all pixels successively, and repeat step 3 ~ step
Five, complete the calibration of camera image curved surface.
The display unit is the region of entire display screen, display babinet or several display babinet compositions.
The present invention acquires the brightness data of grid joint position on screen with camera, reflects phase by these data
The synthesis curved surface of machine effective viewing field different location is distorted to be modified, and obtains true effective viewing field's plane.The present invention can
With to camera because subtense angle between the range difference and camera and hot spot of effective viewing field's geometric distortion, camera and hot spot etc. mostly because
The distortion of comprehensive curved surface flatness caused by element is corrected, so as to achieve the purpose that screen uniformity calibration.
Description of the drawings：
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is display unit mesh generation schematic diagram.
Fig. 2 is display unit partial schematic diagram.
Fig. 3 is camera acquisition hot spot brightness schematic diagram.
Specific implementation mode
The camera image curved surface method for precisely marking with grid target of the present invention is specific as follows：
Step 1: display unit to be divided into the grid 1 of X × Y, wherein X is grid line number, and Y is grid columns；It is crossed with grid
N × N pixel regions 3 are chosen centered on point 2 is used as sampling area；By taking Fig. 1 as an example, grid line number X=18, grid columns Y=8, net
Lattice joint 2 is 17 × 7, needs manually to demarcate 119 points；As shown in Fig. 2, including each 10 × 10 pixels using region
4；
Step 2: carrying out a precorrection to entire display unit：The all pixels 4 for lighting each sampling area, it is bright with high-precision
Degree meter measures the brightness of each pixel 4；Then the brightness of each pixel is adjusted by display screen control system makes all sampling areas
Pixel intensity is identical；
Step 3: the red primary luminescence chip of each sampling area all pixels 4 is lighted, it is whole using each sampling area as one
Body acquires 5 brightness of hot spot of entire sampling area with high-precision luminance meter and carries out hot spot overall brightness correction so that display is single
The brightness of all hot spots 5 is identical in member；Then it uses high-precision luminance meter to check the brightness of primary all hot spots 2 again, confirms all
2 brightness of hot spot is identical；
Step 4: lighting each sampling area all pixels 4 and acquiring the brightness of all hot spots 5 with camera, due to comprehensive distortion
In the presence of 2 brightness of each hot spot collected at this time is all different, and this luminance difference is exactly luminance deviation caused by comprehensive distortion factors.
Effective viewing field's data other than hot spot are transported into row interpolation using the brightness data of each hot spot 5 as sampled point brightness data at this time
It calculates, obtains camera effective viewing field full luminance data, a curved surface is presented in 6 effective viewing field's brightness data of camera at this time；
Step 5: being compensated to 6 effective viewing field's brightness data of camera keeps all brightness datas identical, obtain entire revised
Smooth visual field plane；A plane is presented in camera effective viewing field brightness data at this time；
Step 6: lighting the green primary luminescence chip of each sampling area all pixels, step 3 ~ step 5 is repeated；Then it lights
The blue primary luminescence chip of each sampling area all pixels repeats step 3 ~ step 5；Finally complete the brightness of camera effective viewing field
Calibration.
The display unit can be the region of entire display screen, display babinet or several display babinet compositions.
The present invention light first it is all with grid cross dot center N × N pixels and it is normalized calibration, in this way
With regard to forming the identical latticed hot spot of matrix form of brightness.The brightness of these hot spots is acquired with camera again.It acquires in this way
Each hot spot brightness difference precisely due to viewing field of camera geometric distortion, the range difference of camera and hot spot and camera and light
The multifactor common caused luminance deviation such as the subtense angle between spot.Using these hot spots brightness data again to these hot spots other than
Entire effective viewing field's brightness data into row interpolation, obtain complete curved surface in effective viewing field, then unified compensation is carried out to curved surface,
It can be obtained by ideal, smooth plane.
Claims (2)
1. a kind of camera image curved surface method for precisely marking with grid target, it is characterised in that include the following steps：
Step 1: display unit to be divided into the grid of X × Y, chosen using centered on grid joint N × N pixel regions as
Sampling area；
Step 2: lighting all pixels of each sampling area and being corrected to each pixel intensity so that all pictures of sampling area
Plain brightness is identical；
Step 3: some primary colours luminescence chip of each sampling area all pixels is lighted, and using entire sampling area as one
A entirety acquires the hot spot brightness of entire sampling area with luminance meter and carries out hot spot overall brightness correction so that display unit
Upper all hot spot brightness are identical；
Step 4: lighting each sampling area all pixels and acquiring the brightness of all hot spots with camera, with each hot spot brightness data
Interpolation arithmetic is carried out as sampled point brightness data, obtains camera effective viewing field full luminance data, at this time camera effective viewing field
A curved surface is presented in brightness data；
Step 5: being compensated to camera effective viewing field brightness data keeps all brightness datas identical, camera effective viewing field at this time
A plane is presented in image；
Step 6: lighting the another two primary colours luminescence chip of each sampling area all pixels successively, and repeat step 3 ~ step
Five, complete the calibration of camera image curved surface.
2. the camera image curved surface method for precisely marking according to claim 1 with grid target, it is characterised in that described
Display unit be entire display screen, display babinet or it is several display babinet composition region.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810051122.1A CN108305294B (en) | 2018-01-19 | 2018-01-19 | Accurate calibration method for camera image curved surface with grid target |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810051122.1A CN108305294B (en) | 2018-01-19 | 2018-01-19 | Accurate calibration method for camera image curved surface with grid target |
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| CN108305294A true CN108305294A (en) | 2018-07-20 |
| CN108305294B CN108305294B (en) | 2021-06-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109816734A (en) * | 2019-01-23 | 2019-05-28 | 武汉精立电子技术有限公司 | Camera calibration method based on target optical spectrum |
| CN111504610A (en) * | 2020-04-22 | 2020-08-07 | 苏州佳智彩光电科技有限公司 | Method and system for extracting brightness of curved-surface screen |
| CN112185301A (en) * | 2020-10-14 | 2021-01-05 | 西安诺瓦星云科技股份有限公司 | Display device correction method and device and processor |
| CN112419966A (en) * | 2020-11-17 | 2021-02-26 | 长春希达电子技术有限公司 | Method for correcting pixel brightness of nonstandard spacing between display units |
| CN115298728A (en) * | 2020-04-23 | 2022-11-04 | 长春希达电子技术有限公司 | Method for collecting and correcting display unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US8614427B1 (en) * | 2002-07-15 | 2013-12-24 | Kla-Tencor Corporation | Suspended membrane calibration sample |
| CN103827917A (en) * | 2011-07-25 | 2014-05-28 | 科英布拉大学 | Method and apparatus for automatic camera calibration using one or more images of a checkerboard pattern |
| CN105334021A (en) * | 2014-07-03 | 2016-02-17 | 苏州三星显示有限公司 | System and method for checking display screen |
-
2018
- 2018-01-19 CN CN201810051122.1A patent/CN108305294B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8614427B1 (en) * | 2002-07-15 | 2013-12-24 | Kla-Tencor Corporation | Suspended membrane calibration sample |
| 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 |
| CN103827917A (en) * | 2011-07-25 | 2014-05-28 | 科英布拉大学 | Method and apparatus for automatic camera calibration using one or more images of a checkerboard pattern |
| CN105334021A (en) * | 2014-07-03 | 2016-02-17 | 苏州三星显示有限公司 | System and method for checking display screen |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109816734A (en) * | 2019-01-23 | 2019-05-28 | 武汉精立电子技术有限公司 | Camera calibration method based on target optical spectrum |
| CN111504610A (en) * | 2020-04-22 | 2020-08-07 | 苏州佳智彩光电科技有限公司 | Method and system for extracting brightness of curved-surface screen |
| CN115298728A (en) * | 2020-04-23 | 2022-11-04 | 长春希达电子技术有限公司 | Method for collecting and correcting display unit |
| CN112185301A (en) * | 2020-10-14 | 2021-01-05 | 西安诺瓦星云科技股份有限公司 | Display device correction method and device and processor |
| CN112185301B (en) * | 2020-10-14 | 2022-03-22 | 西安诺瓦星云科技股份有限公司 | Display device correction method and device and processor |
| CN112419966A (en) * | 2020-11-17 | 2021-02-26 | 长春希达电子技术有限公司 | Method for correcting pixel brightness of nonstandard spacing between display units |
| CN112419966B (en) * | 2020-11-17 | 2022-08-23 | 长春希达电子技术有限公司 | Method for correcting pixel brightness of nonstandard interval between display units |
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