CN105070247B - The determination method of brightness irregularities pixel in display screen - Google Patents
The determination method of brightness irregularities pixel in display screen Download PDFInfo
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Abstract
A kind of determination method of brightness irregularities pixel in display screen, it comprises the following steps：The brightness value of each pixel in display screen output image is obtained respectively, forms original intensity matrix, and the display screen is divided into several pixel groups regions；Frequency domain filtering processing is carried out to the original intensity matrix, obtains background luminance matrix；And the original intensity matrix and the background luminance matrix are done into difference operation, count respectively in each pixel groups region, the difference of the original intensity matrix and the background luminance matrix is more than zero and number is less than the minus pixel of difference or difference is less than zero and number is less than the pixel that difference is more than zero, obtains brightness irregularities pixel in the display screen.The determination method of brightness irregularities pixel in above-mentioned display screen, subtracts background luminance matrix to eliminate background influence by original intensity matrix, relatively accurately can directly obtain brightness irregularities pixel in display screen.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of determination side of brightness irregularities pixel in display screen
Method.
Background technology
OLED (Organic Light Emitting Diode) is Organic Light Emitting Diode, and principle of luminosity is：It is saturating with ITO
Prescribed electrode and metal electrode are respectively as the anode and negative electrode of device, and under certain voltage driving, electronics and hole are respectively from the moon
Pole and anode are injected into electronics and hole transmission layer, and electronics and hole move to luminous by electronics and hole transmission layer respectively
Layer, and met in luminescent layer, form exciton and excite light emitting molecule.
In the epoch that modern display technology quickly updates, AMOLED (Active Matrix Organic Light
Emitting Diode, active matrix organic light-emitting diode) Display Technique is due to possessing self-luminous (without backlight), quick ringing
Should, wide viewing angle, Flexible Displays the advantages that it is more and more of interest by people, with traditional PMOLED (Passive Matrix
Organic Light Emitting Diode, passive matrix Organic Light Emitting Diode) Display Technique compares, and AMOLED is in power
Being applied in consumption, life-span length, high-resolution and large scale has incomparable advantage.However, at present, due to AMOLED techniques
Horizontal limitation, causes each pixel driver TFT threshold voltage inconsistent, carrier mobility mutation, power line IR-
Drop, OLED threshold drift etc., and then cause to input identical data-signal, TFT current value difference is produced, so as to cause to show
The brightness irregularities shown.Therefore, luminance compensation turns into key technology in AMOLED display fields, and brightness during luminance compensation
The determination of uneven pixel also just turns into one of study hotspot.
The content of the invention
In consideration of it, the present invention provides a kind of determination method of brightness irregularities pixel in display screen, mended for subsequent luminance
It is convenient to repay offer.
A kind of determination method of brightness irregularities pixel in display screen, it comprises the following steps：
The brightness value of each pixel in display screen output image is obtained respectively, forms original intensity matrix, and will be described aobvious
Display screen is divided into several pixel groups regions；
Frequency domain filtering processing is carried out to the original intensity matrix, obtains background luminance matrix；And
The original intensity matrix and the background luminance matrix are done into difference operation, count each pixel groups respectively
In region, the difference of the original intensity matrix and the background luminance matrix is more than zero and number is less than the minus picture of difference
Vegetarian refreshments or difference are less than zero and number is less than the pixel that difference is more than zero, obtain brightness irregularities pixel in the display screen
Point and coordinate value.
In one of the embodiments, according to brightness irregularities pixel in the resolution ratio of the display screen or the display screen
The display screen is divided into several pixel groups regions by the ratio of point.
In one of the embodiments, frequency domain filtering processing is carried out to the original intensity matrix, specifically includes following step
Suddenly：
Logarithm process and Fourier transformation are carried out to the original intensity matrix, obtain the first luminance matrix；
Frequency domain filtering processing is carried out to first luminance matrix, obtains the second luminance matrix；
Inverse Fourier transform and index processing are carried out to second luminance matrix, obtains background luminance matrix.
In one of the embodiments, the frequency domain filtering processing uses 2-d gaussian filterses device.
In one of the embodiments, each pixel includes red, green, blue sub-pixel, using two-dimensional function gr(ir,
jr)、gg(ig, jg)、gb(ib, jb) brightness value of the red, green, blue sub-pixel is represented respectively, original intensity matrix is formed, wherein
ir、ig、ibThe respectively row coordinate of red, green, blue sub-pixel, jr、jg、jbTo be respectively the row coordinate of red, green, blue sub-pixel.
In one of the embodiments, brightness value of the brightness value of the pixel under 255 GTGs.
In one of the embodiments, in addition to statistics brightness irregularities pixel is carried out in the display screen obtained
Morphological dilations processing.
The determination method of brightness irregularities pixel in above-mentioned display screen, background luminance square is subtracted by original intensity matrix
Battle array eliminates background influence, relatively accurately can directly obtain brightness irregularities pixel in display screen, while can also use
The determination of bright spot, dim spot, defect line point and zonule brightness irregularities phenomenon in display screen.
Brief description of the drawings
Fig. 1 is the flow chart of the determination method of brightness irregularities pixel in display screen in one embodiment of the invention；
Fig. 2 is the structural representation for the structural elements chosen in one embodiment of the invention in dilation operation.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.Many details are elaborated in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case of running counter to intension of the present invention, therefore the present invention is not limited by following public specific embodiment.
Referring to Fig. 1, it is the flow chart of the determination method of brightness irregularities pixel in display screen in an embodiment.
The determination method of brightness irregularities pixel (mura points), comprises the following steps in a kind of display screen：
S110：The brightness value of each pixel in display screen output image is obtained respectively, forms original intensity matrix, and by institute
State display screen and be divided into several pixel groups regions.
In the present embodiment, display screen output image all pixels point under 255 GTGs is gathered using image capturing system
Brightness value, each pixel includes red, green, blue sub-pixel, using two-dimensional function gr(ir,jr)、gg(ig,jg)、gb(ib,jb)
The brightness value of red, green, blue sub-pixel is represented respectively, forms original intensity matrix, wherein ir、ig、ibRespectively red, green, blue picture
The row coordinate of element, jr、jg、jbTo be respectively the row coordinate of red, green, blue sub-pixel.
Specifically, according to the ratio of brightness irregularities pixel in the resolution ratio of display screen or the display screen by display screen
Several pixel groups regions are divided into, for example, finding brightness irregularities point slabbing in display screen after range estimation, display screen is divided
Into less pixel groups region.And for example, find that brightness irregularities point is in point-like or wire in display screen, and display screen is drawn after range estimation
It is divided into the pixel groups region of area equation.And for example, the display screen that resolution ratio is 512 × 512 can be divided into 8 pixel groups regions,
Each pixel groups area size is 64 × 64；And for example, when the large percentage of brightness irregularities pixel in display screen, Ke Yishi
Degree reduces the area in each pixel groups region.And for example, when brightness irregularities pixel is bright or dark in display screen, can also fit
Degree reduces the area in each pixel groups region.In order that obtained structure is more accurate, can also be by the pixel groups region after division
The division of regional area is carried out again.
S120：Frequency domain filtering processing is carried out to the original intensity matrix, obtains background luminance matrix.
Specifically, it comprises the following steps：
S121：Logarithm process and Fourier transformation are carried out to the original intensity matrix, obtain the first luminance matrix；
In the present embodiment, respectively to luminance matrix gr(ir,jr)、gg(ig,jg)、gb(ib,jb) carry out logarithm process obtain
In gr(ir,jr)、In gg(ig,jg)、In gb(ib,jb), then by In gr(ir,jr)、In gg(ig,jg)、In gb(ib,jb) enter
Row Fourier transformation obtains R (ir,jr)、G(ig,jg)、B(ib,jb), i.e. the first luminance matrix.
S122：Frequency domain filtering processing is carried out to first luminance matrix, obtains the second luminance matrix；
In the present embodiment, Gaussian filter is chosen, it reaches simultaneously in terms of space orientation accuracy and Frequency-domain Stability
To optimal.Specifically, choose 2-d gaussian filterses deviceWherein σ is the sky of Gaussian Profile
Between scale factor, then respectively with R (ir,jr)、G(ig,jg)、B(ib,jb) convolution algorithm is done, obtain the second luminance matrix：
★R(ir,jr)；
★G(ig,jg)；
★B(ib,jb)；
Wherein, fR(ir,jr)、fG(ig,jg)、fB(ib,jb) it is the second luminance matrix；
★ is convolution symbol；
σ is the space scale factor of Gaussian Profile.
Preferably, σ value is unsuitable excessive, and σ is bigger, and the frequency band of Gaussian filter is wider, and its action scope is wider, smooth journey
Degree is bigger so that image becomes fuzzyyer.
It is the comprehensive measurement of the intensity of image because low frequency area image reflects the profile information of image, high frequency area image is anti-
The feature of the details such as picture noise and edge is reflected, by 2-d gaussian filterses device, the image of lower frequency region can be obtained, remove high frequency
The image in domain.
S123：Inverse Fourier transform and index processing are carried out to second luminance matrix, obtains background luminance matrix.
By the second luminance matrix fR(ir,jr)、fG(ig,jg)、fB(ib,jb) respectively carry out IDFT (inverse Fourier transform) with
And background luminance matrix g is obtained after exponential transformr’(ir,jr)、gg’(ig,jg)、gb’(ib,jb)。
S130：The original intensity matrix and the background luminance matrix are done into difference operation, count each described respectively
In pixel groups region, the difference of the original intensity matrix and the background luminance matrix is more than zero number and is less than difference less than zero
Or difference is less than zero and number is less than the pixel that difference is more than zero, obtains brightness irregularities pixel in the display screen.
Specifically, by original intensity matrix gr(ir,jr)、gg(ig,jg)、gb(ib,jb) and background luminance matrix gr’(ir,
jr)、gg’(ig,jg)、gb’(ib,jb) do difference operation, i.e.,：
gr(ir,jr)-gr’(ir,jr)；
gg(ig,jg)-gg’(ig,jg)；
gb(ib,jb)-gb’(ib,jb)；
Make Lr k(ir,jr)、Lg k(ig,jg)、Lb k(ib,jb) it is pixel of the difference more than zero, S in each pixel groups regionr k
(ir,jr)、Sg k(ig,jg)、Sb k(ib,jb) it is pixel of the difference less than or equal to zero, LZ in each pixel groups regionr k(ir,jr)、
LZg k(ir,jr)、LZb k(ib,jb) be each pixel groups region in difference more than zero pixel number, SZr k(ir,jr)、SZg k
(ig,jg)、SZb k(ib,jb) be each pixel groups region in difference less than or equal to zero pixel number, k is whole display screen
The number in the pixel groups region of division, mark Ren(in,jn) be uneven pixel, then have：
Wherein, n takes r, g, b respectively.
It is appreciated that brightness irregularities pixel proportion in display screen output image is smaller, and some pixels
The brightness of point is excessively bright compared with background luminance, and the brightness of some pixels is excessively dark compared with background luminance, by by each pixel
Original intensity matrix does difference operation with background luminance matrix in group region, is more than by counting difference in each pixel groups region
Zero and number be less than that the minus pixel of difference or difference are less than zero and number is less than the pixel that difference is more than zero, can obtain
Brightness irregularities pixel in display screen, and pass through row coordinate ir、ig、ib, row coordinate jr、jg、jb, it may be determined that brightness disproportionation
The particular location of even pixel.
S140：Brightness irregularities pixel carries out morphological dilations processing in the display screen obtained to statistics.
It is bright in the display screen obtained to statistics in order to ensure brightness irregularities pixel all in display screen is all found
Spend uneven pixel and carry out morphological dilations processing, for example, choosing structural elements as shown in Figure 2, D is structural elements origin.When
Right structural elements can also be chosen according to specific display screen screen characteristics.Because morphological dilations computing is art technology
Personnel know that its calculating process repeats no more.
The determination method of brightness irregularities pixel in above-mentioned display screen, the initial bright of display screen output image is obtained first
Degree, the property of the profile information in lower frequency region message reflection image in display screen output image, to the low frequency of output image
Domain is handled, and obtains the background image in image, bright according to the brightness of brightness irregularities pixel in image and background image
The inconsistency of degree, handled by the difference of original intensity and background luminance to determine to belong to brightness irregularities pixel in display screen
Point, it is that the correction of brightness irregularities pixel in subsequent display screen is prepared.Due to brightness irregularities pixel in above-mentioned display screen
The determination method of point, subtracts background luminance matrix to eliminate background influence by original intensity matrix, while can also be more accurate
Brightness irregularities pixel in display screen is directly obtained, bright spot in display screen, dim spot, defect line point and small can be applied to
The determination of regional luminance non-uniform phenomenon.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment
To complete, by program the hardware of correlation can also be instructed to complete, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of determination method of brightness irregularities pixel in display screen, it is characterised in that comprise the following steps：
The brightness value of each pixel in display screen output image is obtained respectively, forms original intensity matrix, and by the display screen
It is divided into several pixel groups regions；
Frequency domain filtering processing is carried out to the original intensity matrix, obtains background luminance matrix；And
The original intensity matrix and the background luminance matrix are done into difference operation, count each pixel groups region respectively
Interior, the difference of the original intensity matrix and the background luminance matrix is more than zero and number is less than the minus pixel of difference
Or difference is less than zero and number is less than the pixel that difference is more than zero, obtain in the display screen brightness irregularities pixel with
And coordinate value.
2. the determination method of brightness irregularities pixel in display screen according to claim 1, it is characterised in that according to institute
State the resolution ratio of display screen or the display screen is divided into several by the ratio of brightness irregularities pixel in the display screen
Pixel groups region.
3. the determination method of brightness irregularities pixel in display screen according to claim 1, it is characterised in that to described
Original intensity matrix carries out frequency domain filtering processing, specifically comprises the following steps：
Logarithm process and Fourier transformation are carried out to the original intensity matrix, obtain the first luminance matrix；
Frequency domain filtering processing is carried out to first luminance matrix, obtains the second luminance matrix；
Inverse Fourier transform and index processing are carried out to second luminance matrix, obtains background luminance matrix.
4. the determination method of brightness irregularities pixel in display screen according to claim 3, it is characterised in that the frequency
Domain filtering process uses 2-d gaussian filterses device.
5. the determination method of brightness irregularities pixel in display screen according to claim 1, it is characterised in that Mei Yisuo
Stating pixel includes red, green, blue sub-pixel, using two-dimensional function gr(ir, jr)、gg(ig, jg)、gb(ib, jb) respectively represent described in
The brightness value of red, green, blue sub-pixel, form original intensity matrix, wherein ir、ig、ibThe respectively row seat of red, green, blue sub-pixel
Mark, jr、jg、jbTo be respectively the row coordinate of red, green, blue sub-pixel.
6. the determination method of brightness irregularities pixel in display screen according to claim 1, it is characterised in that the picture
Brightness value of the brightness value of vegetarian refreshments under 255 GTGs.
7. the determination method of brightness irregularities pixel in display screen according to claim 1, it is characterised in that also include
Brightness irregularities pixel carries out morphological dilations processing in the display screen obtained to statistics.
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| CN105654891B (en) * | 2016-04-05 | 2018-06-26 | 京东方科技集团股份有限公司 | A kind of method, apparatus and display panel for obtaining mura offsets |
| CN106441820B (en) * | 2016-11-23 | 2019-07-26 | 深圳Tcl新技术有限公司 | Display screen homogeneity testing method and system |
| CN106448524B (en) * | 2016-12-14 | 2020-10-02 | 深圳Tcl数字技术有限公司 | Method and device for testing brightness uniformity of display screen |
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| CN108881739B (en) * | 2018-07-18 | 2020-01-10 | 腾讯科技（深圳）有限公司 | Image generation method, device, terminal and storage medium |
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| CN109886952B (en) * | 2019-02-25 | 2021-04-23 | 京东方科技集团股份有限公司 | Screen defect point detection method and device and computer readable medium |
| CN110503923A (en) * | 2019-07-29 | 2019-11-26 | 惠州市德赛西威汽车电子股份有限公司 | A kind of method and device compensating display screen mura defect |
| CN111028773B (en) * | 2019-12-06 | 2021-07-23 | 武汉华星光电半导体显示技术有限公司 | Method and device for acquiring compensation coefficient of brightness unevenness compensation technology |
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