CN108830795A - The method for removing moire fringes in image-detection process - Google Patents
The method for removing moire fringes in image-detection process Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- 239000011159 matrix material Substances 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 8
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/40—Scaling of whole images or parts thereof, e.g. expanding or contracting
- G06T3/4038—Image mosaicing, e.g. composing plane images from plane sub-images
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- G—PHYSICS
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Abstract
The invention discloses a kind of methods of moire fringes in removal image-detection process, including focus, and obtain row subgraph, the amendment of row subgraph and image mosaic step.Row subgraph is corrected：According to the Y-coordinate value for having lighted four angles of lattice on first row subgraph, the Y-coordinate value at four angles of center lattice theoretical on first row subgraph is calculated；The theoretical Y-coordinate value at four angles of every a line lattice is calculated according to the Y-coordinate value at theoretical four angles of center lattice；According to the theoretical Y-coordinate value at four angles of every a line lattice, all lattices for being in the row are applied into displacement along the y axis, corrects the Y-coordinate value at all four angles of lattice of the row to theoretical Y-coordinate value, be located at all lattices for being in same a line in same horizontal line；It repeats the above steps, until all row subgraphs amendment of shooting finishes.The beneficial effects of the present invention are：Solve the problems, such as that the method that moire fringes are removed in image-detection process is complicated for operation and needs special gallery.
Description
Technical field
The present invention relates to the technical field of image procossing, in particular to the side of moire fringes in a kind of removal image-detection process
Method.
Background technique
In liquid crystal display panel or organic EL panel this kind display panel, by with R (red), G (green), B (indigo plant) sub- picture
The different on-off modes of the pixel (pixel) of element show image and/or image, wherein generally use R (red), G (green), B
(indigo plant) forms the three primary colors of light, portioned product or addition W (white) or Y (Huang) and is showed with obtaining wider array of colour gamut or brightness.Generally
For, in such display panel, inevitably there is the deviation of machining accuracy in manufacturing process, causes display uneven.
Display uneven phenomenon is broadly divided into luminance nonuniformity and irregular colour.Luminance nonuniformity to have between the pixel closed on
There is brightness step；In the relative luminance relationship of R, G, B (W, Y) of each pixel, there are gradients for irregular colour generation.
Particularly, it is difficult to keep the thickness of the organic compound layer of each pixel uniform in organic EL panel processing technology, because
This is easy to happen the characteristic that zonal display is uneven because caused by the thickness of organic compound layer is inconsistent.
As the countermeasure to this situation, patent document (CN105575326A) proposes a kind of intensity measuring method, obtains
Luminance matrix of the display panel under at least three grayscale；Brightness uniformity region and brightness irregularities area are determined according to luminance matrix
Domain；The actual measurement gamma curve for measuring brightness uniformity region calculates each pixel in brightness irregularities region according to luminance matrix
In the corresponding fitting Gamma value of at least three grayscale；It is fitted obtains brightness respectively according to actual measurement gamma curve, fitting Gamma value
The fitting gamma curve of each pixel in non-uniform areas；According to the fitting gamma curve of each pixel to brightness disproportionation
Even region carries out brightness calibration.Through the above way, the present invention can be improved the precision of calibration brightness disproportionation and improve calibration
Efficiency.
Patent document (WO2013159377A1) proposes another detection mode, obtains the back being arranged on detection board
The space brightness value generated when optical mode group is in standard luminance in multiple positions of detection board, and using the space brightness value as
Normed space brightness value (S201)；Obtain the instant space brightness value (S202) that backlight module is generated in multiple position；It will be i.e.
When space brightness value be compared with normed space brightness value, therefore, it is determined that whether backlight module abnormal (S203).The detection side
Method substitutes luminance measuring instrument using illumination photometry instrument, has saved cost.
But above method is required to come using in solid-state imaging element (the CCD or CMOS) camera of periodic arrangement
Shooting pixel is equally in the image of the display panel of periodic arrangement, in the case, the period that can arrange by camera pixel with
It can not match between the period of display panel arrangement and generate offset, cause the image being taken to interfere, this interference item
Line is known as moire fringes (Moire) in the industry.
If can be occurred based on the luminance for the shooting determining image pixel that moire fringes have occurred due on a display panel
Be positioned corresponding to the pixel of the position of moire fringes luminance it is measured it is partially secretly equal and the case where can not correctly measure luminance, therefore
It needs to inhibit the influence as caused by moire fringes.
As the countermeasure to this situation, patent document (CN106664359A) discloses following method:It is focusing and is shooting
When the moire fringes (M) that generate generate in the state of shoot image, removed with high-pass filter (12) from the image taken suitable
Using camera (2) defocus and image is shot, to what is taken in the spatial frequency composition of moire fringes (M) to generate the 1st image
Image is applicable in low-pass filter (13) to generate the 2nd image, and the 1st image and the 2nd image are synthesized, and generates moire fringes (M) and disappears
Mistake or repressed 3rd image.But the method for 2 removal moire fringes is complicated for operation in above patent document and needs special
Gallery.
Summary of the invention
In view of the problems of the existing technology, the main object of the present invention is to provide in a kind of removal image-detection process and rubs
The method of your line, it is intended to which the method for solving to remove moire fringes in image-detection process is complicated for operation and need special gallery
The problem of.
To achieve the above object, the method proposed by the present invention for removing moire fringes in image-detection process, including following step
Suddenly：
S1 is focused：Display panel is placed on rack, camera is fixed on to the surface of display panel, and by camera
Camera lens central axes it is vertical with display panel, adjust the focal length of camera.
S2 obtains row subgraph：Image that display panel is shown is lighted by interlacing or in a manner of several rows the crystalline substance of every row
Lattice, the spaced row subgraph that shooting display panel is shown.
S3, the amendment of row subgraph：
A1 takes the Y-coordinate value that four angles of lattice have been lighted on first row subgraph of display panel according to camera,
Calculate the Y-coordinate value at four angles of center lattice theoretical on first row subgraph.
A2 calculates the theoretical Y coordinate at four angles of every a line lattice according to the Y-coordinate value at theoretical four angles of center lattice
Value.
A3 applies all lattices for being in the row according to the theoretical Y-coordinate value at four angles of every a line lattice along the y axis
Add a displacement, correct the Y-coordinate value at all four angles of lattice of the row to theoretical Y-coordinate value, makes to be in all of same a line
Lattice is located in same horizontal line.
A4 repeats step A2-A3, until all row subgraphs shot in step S2 amendment is finished.
S4, image mosaic：All revised subgraphs are stitched together, the amendment image of removal moire fringes is obtained.
Preferably, in step s 2, the process of acquisition row subgraph is：
Light the 1st row of display panel, 1+a row, 1+2a row ..., until light all 1+m1The lattice of a row, shooting
The first row subgraph.Light the 2nd row of display panel, 2+a row, 2+2a row ..., until light all 2+m2The lattice of a row,
Shoot the second row subgraph.And so on, light display panel a row, 2a row, 3a row ..., until light all m3a
Capable lattice shoots a row subgraph.
Wherein, a >=2, m3A row lattice is the last line lattice that display panel shows image, 2+m2A row lattice is display
The inverse a-1 row lattice of Display panel image, 1+m1The lattice of a row is inverse a row lattice.
It preferably, in step s 2, further include obtaining column subgraph：By the image on display panel every column or every ordered series of numbers
Mode light the lattice of each column, the spaced column subgraph that shooting display panel is shown.
It further, in step s3, further include that the column of subgraph are corrected：
B1 takes the X-coordinate value that four angles of lattice have been lighted on first column subgraph of display panel according to camera,
Calculate the X-coordinate value at four angles of center lattice theoretical on first column subgraph.
B2 calculates the theoretical X-coordinate at four angles of each column lattice according to the X-coordinate value at theoretical four angles of center lattice
Value.
B3 applies all lattices for being in the column according to the theoretical X-coordinate value at four angles of each column lattice along the x axis
Add a displacement, correct the X-coordinate value at all four angles of lattice of the column to theoretical X-coordinate value, makes to be in all of same row
Lattice is located on same vertical line.
B4 repeats step B2-B3, until all column subgraphs shot in step S2 amendment is finished.
Preferably, in step s 2, the process of acquisition column subgraph is：
Light the column of display panel the 1st, 1+b column, 1+2b column ..., until light all 1+n1The lattice of b column, shooting
First row subgraph.Light the column of display panel the 2nd, 2+b column, 2+2b column ..., until light all 2+n2The lattice of b column,
Shoot secondary series subgraph.And so on, light display panel b column, 2b column, 3b column ..., until light all n3b
The lattice of column shoots b column subgraph.
Wherein, b >=2, n3B column lattice is last column lattice that display panel shows image, 2+n2B column lattice is display
The inverse b-1 column lattice of Display panel image, 1+n1The lattice of b column is inverse b column lattice.
Further, in step s 4, image mosaic process includes：
All revised row subgraphs are stitched together by S41, obtain row amendment subgraph.
All revised column subgraphs are stitched together by S42, obtain column amendment subgraph.
Row amendment subgraph and column amendment subgraph are stitched together, obtain the amendment image of removal moire fringes by S43.
Further, in step S43, when row amendment subgraph and column amendment subgraph are stitched together, row is repaired
The luminance matrix of positive sub-image is weighted and averaged with column amendment subgraph luminance matrix, and it is bright to obtain the image that display panel is shown
Degree distribution, the brightness of each lattice of stitching image is adjusted according to the Luminance Distribution of acquisition, obtains the correction map of removal moire fringes
Picture.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the flow chart of the method for the present invention preferred embodiment operation；
Fig. 2 is that row subgraph corrects flow chart in the method for the present invention preferred embodiment；
Fig. 3 is that column subgraph corrects flow chart in the method for the present invention preferred embodiment；
Fig. 4 is image mosaic flow chart in the method for the present invention preferred embodiment；
The object of the invention is realized, the embodiments will be further described with reference to the accompanying drawings for functional characteristics and advantage.
Specific embodiment
The present invention proposes a kind of method for removing moire fringes in image-detection process.
Referring to Fig.1-4, Fig. 1 is the flow chart of the method for the present invention preferred embodiment operation, and Fig. 2 is that the method for the present invention is preferably real
It applies row subgraph in example and corrects flow chart, Fig. 3 is that column subgraph corrects flow chart in the method for the present invention preferred embodiment, and Fig. 4 is
Image mosaic flow chart in the method for the present invention preferred embodiment.
As shown in Figs 1-4, in an embodiment of the present invention, in the removal image-detection process moire fringes method, including
Following steps：
S1 is focused：Display panel is placed on rack, camera is fixed on to the surface of display panel, and by camera
Camera lens central axes it is vertical with display panel, adjust the focal length of camera.
S2 obtains row subgraph：Image that display panel is shown is lighted by interlacing or in a manner of several rows the crystalline substance of every row
Lattice, the spaced row subgraph that shooting display panel is shown.
S3, the amendment of row subgraph：
A1 takes the Y-coordinate value that four angles of lattice have been lighted on first row subgraph of display panel according to camera,
Calculate the Y-coordinate value at four angles of center lattice theoretical on first row subgraph.
A2 calculates the theoretical Y coordinate at four angles of every a line lattice according to the Y-coordinate value at theoretical four angles of center lattice
Value.
A3 applies all lattices for being in the row according to the theoretical Y-coordinate value at four angles of every a line lattice along the y axis
Add a displacement, correct the Y-coordinate value at all four angles of lattice of the row to theoretical Y-coordinate value, makes to be in all of same a line
Lattice is located in same horizontal line.
A4 repeats step A2-A3, until all row subgraphs shot in step S2 amendment is finished.
S4, image mosaic：All revised row subgraphs are stitched together, the correction map of removal moire fringes is obtained
Picture.
Specifically, in step s 2, the process of acquisition row subgraph is：
Light the 1st row of display panel, 1+a row, 1+2a row ..., until light all 1+m1The lattice of a row, shooting
The first row subgraph.Light the 2nd row of display panel, 2+a row, 2+2a row ..., until light all 2+m2The lattice of a row,
Shoot the second row subgraph.And so on, light display panel a row, 2a row, 3a row ..., until light all m3a
Capable lattice shoots a row subgraph.
Wherein, a >=2, m3A row lattice is the last line lattice that display panel shows image, 2+m2A row lattice is display
The inverse a-1 row lattice of Display panel image, 1+m1The lattice of a row is inverse a row lattice.
Specifically, in the present embodiment, in order to which the precision for improving removal moire fringes further includes in step s 2 obtaining column
Subgraph：Image on display panel is lighted to the lattice of each column in a manner of every column or every ordered series of numbers, shooting display panel is shown
Spaced column subgraph.
Specifically, in the present embodiment, in order to which the precision for improving removal moire fringes further includes in step s3 to column
The amendment of image：
B1 takes the X-coordinate value that four angles of lattice have been lighted on first column subgraph of display panel according to camera,
Calculate the X-coordinate value at four angles of center lattice theoretical on first column subgraph.
B2 calculates the theoretical X-coordinate at four angles of each column lattice according to the X-coordinate value at theoretical four angles of center lattice
Value.
B3 applies all lattices for being in the column according to the theoretical X-coordinate value at four angles of each column lattice along the x axis
Add a displacement, correct the X-coordinate value at all four angles of lattice of the column to theoretical X-coordinate value, makes to be in all of same row
Lattice is located on same vertical line.
B4 repeats step B2-B3, until all column subgraphs shot in step S2 amendment is finished.
Specifically, in step s 2, the process of acquisition column subgraph is：
Light the column of display panel the 1st, 1+b column, 1+2b column ..., until light all 1+n1The lattice of b column, shooting
First row subgraph.Light the column of display panel the 2nd, 2+b column, 2+2b column ..., until light all 2+n2The lattice of b column,
Shoot secondary series subgraph.And so on, light display panel b column, 2b column, 3b column ..., until light all n3b
The lattice of column shoots b column subgraph.
Wherein, b >=2, n3B column lattice is last column lattice that display panel shows image, 2+n2B column lattice is display
The inverse b-1 column lattice of Display panel image, 1+n1The lattice of b column is inverse b column lattice.
Specifically, in the present embodiment, in order to improve removal moire fringes precision, in step s 4, image mosaic process
Including：
All revised row subgraphs are stitched together by S41, obtain row amendment subgraph.
All revised column subgraphs are stitched together by S42, obtain column amendment subgraph.
Row amendment subgraph and column amendment subgraph are stitched together, obtain the amendment image of removal moire fringes by S43.
Specifically, in step S43, when row amendment subgraph and column amendment subgraph are stitched together, row is corrected
The luminance matrix of subgraph is weighted and averaged with column amendment subgraph luminance matrix, obtains the brightness of image that display panel is shown
Distribution adjusts the brightness of each lattice of stitching image according to the Luminance Distribution of acquisition, obtains the amendment image of removal moire fringes.
The present invention lights display panel by interlacing or in a manner of several rows, and obtains multiple row subgraphs；According to
The Y-coordinate value that four angles of lattice have been lighted on first row subgraph calculates center lattice four theoretical on display panel
The Y-coordinate value at a angle；It is brilliant that every a line on first row subgraph is calculated according to the Y-coordinate value at theoretical four angles of center lattice
The theoretical Y-coordinate value at four angles of lattice；Lattices of having lighted all on first row subgraph are applied into a displacement along the y axis,
Correct all Y-coordinate value for having lighted four angles of lattice to the theoretical Y-coordinate value at four angles of locating row lattice, to make to be in
All lattices with a line are located in same horizontal line.Aforesaid operations are repeated, all row subgraphs are modified, and will own
Revised row subgraph is stitched together, and obtains row amendment subgraph.Using same method, row operation is become into column behaviour
Make, obtains column amendment subgraph.Luminance matrix and column amendment subgraph luminance matrix to capable amendment subgraph are weighted flat
, the image brightness distribution that display panel is shown is obtained, each lattice of stitching image is adjusted according to the Luminance Distribution of acquisition
Brightness, to obtain the amendment image of removal moire fringes.
Detection of the method for the present invention especially suitable for spontaneous light pixel display panel, is equally also suitable backlight display panel,
According to backlight display panel, the case where additionally considering backlight light leakage when carrying out subgraph splicing, to black and white portion
Divide and do additional processing, the black portions of each figure layer are reduced to 1/n displayed separately and are only truth.High-precision camera
Focus steps obtain subgraph step and subgraph amendment step as the method for the present invention, and details are not described herein.
The present invention takes the center lattice offset minimum on display panel using camera, and shows in interlacing or every several rows
In the row subgraph shown, every column or every in the column subgraph that ordered series of numbers is shown, the display pixel of adjacent rows is not interfered, each lattice
Offset be easier to be found, thus to each lattice on row subgraph with respect to center lattice along the y axis applies be displaced give
With amendment, displacement is applied with respect to center lattice to each lattice on column subgraph along the x axis and is corrected, it is true to get
Image.
Compared with prior art, the beneficial effects of the present invention are：It solves and removes moire fringes in image-detection process
The problem of gallery that method is complicated for operation and needs are special.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (6)
1. a kind of method of moire fringes in removal image-detection process, which is characterized in that the described method comprises the following steps：
S1 is focused：Display panel is placed on rack, camera is fixed on to the surface of display panel, and by the mirror of camera
Head central axes are vertical with display panel, adjust the focal length of camera；
S2 obtains row subgraph：Image that display panel is shown is lighted by interlacing or in a manner of several rows the lattice of every row, is clapped
Take the photograph the spaced row subgraph that display panel is shown；
S3, the amendment of row subgraph：
A1 takes the Y-coordinate value that four angles of lattice have been lighted on first row subgraph of display panel according to camera, calculates
The Y-coordinate value at lattice four angles in center theoretical on first row subgraph out；
A2 calculates the theoretical Y coordinate at four angles of every a line lattice according to the Y-coordinate value at four angles of center lattice of the theory
Value；
All lattices for being in the row are applied one according to the theoretical Y-coordinate value at four angles of every a line lattice by A3 along the y axis
A displacement corrects the Y-coordinate value at all four angles of lattice of the row to the theoretical Y-coordinate value, makes to be in all of same a line
Lattice is located in same horizontal line；
A4 repeats step A2-A3, until all row subgraphs shot in step S2 amendment is finished.
S4, image mosaic：All revised row subgraphs are stitched together, the amendment image of removal moire fringes is obtained.
2. removing the method for moire fringes in image-detection process as described in claim 1, which is characterized in that in step s 2,
Obtain row subgraph process be：
Light the 1st row of display panel, 1+a row, 1+2a row ..., until light all 1+m1The lattice of a row shoots the first row
Subgraph；Light the 2nd row of display panel, 2+a row, 2+2a row ..., until light all 2+m2The lattice of a row, shooting the
Two row subgraphs；And so on, light display panel a row, 2a row, 3a row ..., until light all m3The crystalline substance of a row
Lattice shoot a row subgraph；
Wherein, a >=2, m3A row lattice is the last line lattice that display panel shows image, 2+m2A row lattice is display panel
Show the inverse a-1 row lattice of image, 1+m1The lattice of a row is inverse a row lattice.
3. removing the method for moire fringes in image-detection process as described in claim 1, which is characterized in that
It in step s 2, further include obtaining column subgraph：Image on display panel is lighted in a manner of every column or every ordered series of numbers
The lattice of each column, the spaced column subgraph that shooting display panel is shown；
It in step s3, further include that the column of subgraph are corrected：
B1 takes the X-coordinate value that four angles of lattice have been lighted on first column subgraph of display panel according to camera, calculates
The X-coordinate value at lattice four angles in center theoretical on first column subgraph out；
B2 calculates the theoretical X-coordinate at four angles of each column lattice according to the X-coordinate value at four angles of center lattice of the theory
Value；
All lattices for being in the column are applied one according to the theoretical X-coordinate value at four angles of each column lattice by B3 along the x axis
A displacement corrects the X-coordinate value at all four angles of lattice of the column to the theoretical X-coordinate value, makes to be in all of same row
Lattice is located on same vertical line；
B4 repeats step B2-B3, until all column subgraphs shot in step S2 amendment is finished.
4. removing the method for moire fringes in image-detection process as claimed in claim 3, which is characterized in that
In step s 2, the process of acquisition column subgraph is：
Light the column of display panel the 1st, 1+b column, 1+2b column ..., until light all 1+n1The lattice of b column, shoots first row
Subgraph；Light the column of display panel the 2nd, 2+b column, 2+2b column ..., until light all 2+n2The lattice of b column, shooting the
Two column subgraphs；And so on, light display panel b column, 2b column, 3b column ..., until light all n3The crystalline substance of b column
Lattice shoot b column subgraph；
Wherein, b >=2, n3B column lattice is last column lattice that display panel shows image, 2+n2B column lattice is display panel
Show the inverse b-1 column lattice of image, 1+n1The lattice of b column is inverse b column lattice.
5. the method for moire fringes in removal image-detection process according to any one of claims 1-4, which is characterized in that in step
In rapid S4, image mosaic process includes：
All revised row subgraphs are stitched together by S41, obtain row amendment subgraph；
All revised column subgraphs are stitched together by S42, obtain column amendment subgraph；
Row amendment subgraph and column amendment subgraph are stitched together, obtain the amendment image of removal moire fringes by S43.
6. removing the method for moire fringes in image-detection process as claimed in claim 5, which is characterized in that in step S43,
Luminance matrix and column amendment subgraph when row amendment subgraph and column amendment subgraph are stitched together, to row amendment subgraph
Image brightness matrix is weighted and averaged, and is obtained the image brightness distribution that display panel is shown, is adjusted according to the Luminance Distribution of acquisition
The brightness of each lattice of stitching image obtains the amendment image of removal moire fringes.
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