CN110148098B - Singularity processing method for OLED screen DeMURA - Google Patents
Singularity processing method for OLED screen DeMURA Download PDFInfo
- Publication number
- CN110148098B CN110148098B CN201910449204.6A CN201910449204A CN110148098B CN 110148098 B CN110148098 B CN 110148098B CN 201910449204 A CN201910449204 A CN 201910449204A CN 110148098 B CN110148098 B CN 110148098B
- Authority
- CN
- China
- Prior art keywords
- point
- demura
- singular
- oled screen
- brightness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003672 processing method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000004364 calculation method Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/90—Dynamic range modification of images or parts thereof
- G06T5/94—Dynamic range modification of images or parts thereof based on local image properties, e.g. for local contrast enhancement
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30148—Semiconductor; IC; Wafer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30168—Image quality inspection
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The invention discloses a singular point processing method for an OLED screen DeMURA, which comprises the following steps: 1. a singular point judgment method in the DeMURA process; 2. and a singular point processing method in the DeMURA process. The invention judges the singular point based on the adjustment factor in the DeMURA process, can eliminate the MURA phenomenon caused by the singular point to a certain extent, and improves the precision of the DeMURA; and the estimated gray level based on the periphery of the singular point is subjected to singular point processing, so that a new MURA phenomenon is avoided, and the result of the DeMURA is more uniform.
Description
Technical Field
The invention relates to the technical field of screen image processing, in particular to the technical field of image processing of a camera or a mobile phone screen.
Background
The OLED screen causes non-uniformity in display due to non-linearity of the luminance of each light emitting cell with the input gray, which is a display defect mainly manifested by low contrast, blurred edges, and various shapes of the defect region and the surrounding background.
Singularities are introduced due to dead spots in the OLED screen itself, contamination of the screen, or noise in the scanning device itself. In the Demura method that has been disclosed so far, there is no detailed discussion about singular points. On one hand, noise introduced by an OLED screen in a scanning process during a singular point is generally considered to be removed by using a filtering method, but the mura phenomenon caused by the singular point is essentially ignored by the processing method; on the other hand, the Demura algorithm calculates the adjustment factor of each point according to the measured brightness value and the input gray value, and the singular point influences the accuracy of the calculation result.
Disclosure of Invention
The invention aims to provide a singular point processing method in a Demura process of an OLED screen, which is used for judging whether the singular point is a singular point or not in the Demura process and giving corresponding processing to finally improve the precision of the Demura and the uniformity of the OLED screen.
The technical scheme adopted by the invention for realizing the purpose is as follows: a singular point processing method for an OLED screen DeMURA comprises the following steps:
step 1, judging singular points,
when Demura is carried out on an OLED screen, an adjusting factor omega (x, y) of a point (x, y) is calculated, when the adjusting amplitude | omega (x, y) -1| is larger than a given certain threshold value Delta, the point is considered as a singular point,
step 2, singular point processing is carried out,
step 2-1, when the brightness L (x, y) =0 acquired by the point (x, y), the point is a dead point of the OLED screen, and the brightness L of the point is b (x, y) is:
l (i, j) is the adjusted brightness value of the point (x, y), N is the number of the selected points, and the brightness L (i, j) of the peripheral points is updated to
The point (i, j) uses the updated luminance to calculate the adjustment factor.
Step 2-2, when the brightness L (x, y) ≠ 0 acquired from the point (x, y), the estimated gray level of the point is as follows;
the selection of the point (i, j) refers to the threshold calculation in step 1, g (i, j) is the estimated gray level of the point after adjustment, and the adjustment factor ω (x, y) of the point is:
in step 1, the method for calculating the adjustment factor ω (x, y) of the point (x, y) includes: acquiring brightness information of the OLED screen to obtain an actual gray value g (x, y) of the mobile phone screen, and calculating an adjustment factor of a point (x, y) according to the gray value g' (x, y) driven by the OLED screen
In the step 1, the value of the threshold value Δ is obtained by the following method:
1-1, adjusting the amplitude to be less than 30% by using an empirical threshold;
in the mode 1-2, the adjustment factors of n neighborhood non-singular points of the point (x, y) are averaged, and n is 4 or 8;
mode 1-3, the adjustment factors for the distance pixel non-singular points for point (x, y) are averaged, and the distance is the city distance or Euclidean distance.
The singular point processing method for the OLED screen DeMURA has the advantages that: 1. singular point judgment is carried out based on a threshold value mode, statistical characteristic analysis or attribute analysis of a global image is not needed, and judgment efficiency is high; 2. the average brightness value of the adjacent pixels of the point is used as the brightness value of the point, so that the adjustment factor is calculated, and the method is simple and convenient to calculate and high in instantaneity and realizability; 3. because the brightness of the adjacent pixels is used for adjustment, new mura is not brought, and the precision and the uniformity of the Demura are improved.
Drawings
FIG. 1 is a flow chart of a singular point processing method for an OLED panel DeMURA according to the present invention.
Detailed Description
The singular point processing method for the OLED screen DeMURA uses the adjustment factors and the brightness of the adjacent pixels to judge and process the singular point. The specific method comprises the following steps:
step 1, singular point judgment:
when the Demura is carried out on the OLED screen, the adjustment factor omega (x, y) of the point (x, y) is calculated, and the calculation method of the adjustment factor omega (x, y) of the point (x, y) is to acquire the brightness of the OLED screenObtaining the actual gray value g (x, y) of the mobile phone screen, and calculating the adjustment factor of the point (x, y) according to the gray value g' (x, y) driven by the OLED screen
When the adjustment amplitude | ω (x, y) -1| is greater than a given certain threshold value Δ, the point is considered as a singular point;
the value of the threshold Δ can be obtained by the following methods:
mode 1-1, empirical threshold, generally, the adjustment amplitude is less than 30%;
in the mode 1-2, the adjustment factors of the N neighborhood non-singular points of the point are averaged, wherein N is generally 4 or 8;
mode 1-3, the adjustment factor of the distance pixel non-singular point of the point is averaged, and may be city distance, euclidean distance or other.
Step 2, the singular point processing is divided into two conditions:
step 2-1, when the brightness L (x, y) =0 acquired by the point (x, y), the point is considered as a dead point of the OLED screen, and the brightness L of the point is determined b (x, y) is calculated by the following formula:
l (i, j) is the brightness value of the adjusted point (x, y), and the point is selected according to the step 1, wherein N is the number of the selected points (N is more than or equal to 8). The brightness L (i, j) of the peripheral point is updated to
The point (i, j) uses the updated luminance to calculate the adjustment factor.
Step 2-2, when the brightness L (x, y) collected by the point (x, y) is not equal to 0, calculating the estimated gray scale of the point by the following formula;
the selection of the point (i, j) can refer to the threshold calculation in step 1, g (i, j) is the estimated gray level of the point after adjustment, and the adjustment factor ω (x, y) of the point is obtained by the following formula
In summary, the method locally judges and processes the singularity of the OLED screen, is simple and convenient to operate and convenient to realize, can eliminate the point mura, and improves the precision and uniformity of the Demura.
While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (3)
1. A singular point processing method for an OLED screen DeMURA is characterized by comprising the following steps: the method comprises the following steps:
step 1, judging singular points,
when Demura is carried out on an OLED screen, an adjusting factor omega (x, y) of a point (x, y) is calculated, when the adjusting amplitude | omega (x, y) -1| is larger than a given certain threshold value delta, the point is considered as a singular point,
step 2, singular point processing is carried out,
step 2-1, when the brightness L (x, y) =0 acquired by the point (x, y), the point is a dead point of the OLED screen, and the brightness L of the point is b (x, y) is:
l (i, j) is the adjusted brightness value of the point (x, y), N is the number of the selected points, and the brightness L (i, j) of the peripheral points is updated to
Calculating an adjustment factor by using the updated brightness at the point (i, j);
step 2-2, when the brightness L (x, y) collected by the point (x, y) is not equal to 0, the estimated gray level of the point is as follows;
the selection of the point (i, j) refers to the threshold calculation in step 1, g (i, j) is the estimated gray level of the point after adjustment, and the adjustment factor ω (x, y) of the point is:
2. the singular point processing method for the OLED screen DeMURA according to claim 1, wherein: in step 1, the method for calculating the adjustment factor ω (x, y) of the point (x, y) includes: acquiring brightness information of the OLED screen to obtain an actual gray value g (x, y) of the mobile phone screen, and calculating adjustment factors of the point (x, y) according to the gray value g' (x, y) driven by the OLED screen
3. The singular point processing method for the OLED screen DeMURA according to claim 1, wherein: in the step 1, the value of the threshold value Δ is obtained by the following method:
1-1, adjusting the amplitude to be less than 30% by using an empirical threshold;
in the mode 1-2, the adjustment factors of n neighborhood non-singular points of the point (x, y) are averaged, and n is 4 or 8;
mode 1-3, the adjustment factors for the distance pixel non-singular points for point (x, y) are averaged, and the distance is the city distance or Euclidean distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910449204.6A CN110148098B (en) | 2019-05-28 | 2019-05-28 | Singularity processing method for OLED screen DeMURA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910449204.6A CN110148098B (en) | 2019-05-28 | 2019-05-28 | Singularity processing method for OLED screen DeMURA |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110148098A CN110148098A (en) | 2019-08-20 |
| CN110148098B true CN110148098B (en) | 2023-01-17 |
Family
ID=67592105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910449204.6A Active CN110148098B (en) | 2019-05-28 | 2019-05-28 | Singularity processing method for OLED screen DeMURA |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110148098B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992879B (en) * | 2019-12-11 | 2022-07-15 | 易诚高科（大连）科技有限公司 | DeMURA data acquisition optimization method based on OLED electrical characteristic evaluation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200047A (en) * | 2016-08-29 | 2016-12-07 | 武汉精测电子技术股份有限公司 | A kind of method of TFT LCD Mura defects detection based on GPU |
| CN106530292A (en) * | 2016-10-28 | 2017-03-22 | 鞍钢未来钢铁研究院 | Strip steel surface defect image rapid identification method based on line scanning camera |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104766569B (en) * | 2015-04-29 | 2018-04-13 | 深圳市华星光电技术有限公司 | The dynamic backlight adjusting method of screen |
-
2019
- 2019-05-28 CN CN201910449204.6A patent/CN110148098B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200047A (en) * | 2016-08-29 | 2016-12-07 | 武汉精测电子技术股份有限公司 | A kind of method of TFT LCD Mura defects detection based on GPU |
| CN106530292A (en) * | 2016-10-28 | 2017-03-22 | 鞍钢未来钢铁研究院 | Strip steel surface defect image rapid identification method based on line scanning camera |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110148098A (en) | 2019-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110085166B (en) | Bright spot compensation method and device for curved screen | |
| JP6719579B2 (en) | Compensation method for unevenness | |
| CN106448608B (en) | Screen brightness adjusting method and device aiming at mura problem and television | |
| CN103297789B (en) | White balance correcting method and white balance correcting device | |
| KR20170128573A (en) | Display myra calibration method, apparatus, and system | |
| CN106782307A (en) | The gray level compensation method and gray scale compensation system of a kind of OLED display panel | |
| KR101941801B1 (en) | Image processing method and device for led display screen | |
| US8804013B2 (en) | Method of calculating lens shading compensation factor and method and apparatus for compensating for lens shading by using the method | |
| CN109377935B (en) | Brightness compensation method and device and electroluminescent display device | |
| CN108009997B (en) | Method and device for adjusting image contrast | |
| CN106131526B (en) | A kind of white balancing treatment method and device based on rgb space | |
| CN103377474B (en) | Camera lens shadow correction coefficient determines method, camera lens shadow correction method and device | |
| CN107749284B (en) | Compensation data acquisition method of curved panel and liquid crystal display | |
| WO2016106852A1 (en) | Grey scale compensation method and grey scale compensation system for defect of display panel | |
| CN108364615B (en) | Mura compensation method and Mura compensation system | |
| CN110148098B (en) | Singularity processing method for OLED screen DeMURA | |
| CN1303812C (en) | Apparatus for image enhancement and method of using the same | |
| CN101308572A (en) | Luminous effect processing method and apparatus | |
| CN1305317C (en) | Image brightness correcting method of video monitoring system | |
| CN105654424B (en) | Adjustment ratio display methods, display system, display device and the terminal of image | |
| CN104240227A (en) | Image analysis system and method | |
| CN106971375B (en) | Image amplification processing method and device | |
| CN109819242A (en) | A kind of flare test method, system and readable storage medium storing program for executing | |
| JPWO2012081398A1 (en) | Glass plate, glass plate inspection method, and glass plate manufacturing method | |
| CN110956639B (en) | Analysis method for OLED screen pixel acquisition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A Singular Point Processing Method for OLED Screen DeMURA Effective date of registration: 20230726 Granted publication date: 20230117 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: YICHENG GAOKE (DALIAN) TECHNOLOGY Co.,Ltd. Registration number: Y2023980049989 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |