CN107063458B - Ceramic tile coloration piecemeal detection method based on machine vision - Google Patents

Ceramic tile coloration piecemeal detection method based on machine vision Download PDF

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CN107063458B
CN107063458B CN201611060933.5A CN201611060933A CN107063458B CN 107063458 B CN107063458 B CN 107063458B CN 201611060933 A CN201611060933 A CN 201611060933A CN 107063458 B CN107063458 B CN 107063458B
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ceramic tile
image
piecemeal
mask
color
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CN107063458A (en
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李俊
杨林杰
吴拱星
高银
庄加福
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Quanzhou Institute of Equipment Manufacturing
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Quanzhou Institute of Equipment Manufacturing
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46Measurement of colour; Colour measuring devices, e.g. colorimeters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J2003/467Colour computing

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  • General Physics & Mathematics (AREA)
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Abstract

The present invention discloses the ceramic tile coloration piecemeal detection method based on machine vision, including:Step 1, Image Acquisition and positioning;Step 2, the correction of image pose:Using based on ROI image, tiltedly external square diagonal line carries out geometric transformation, to correct ceramic tile pose;Step 3, image block:ROI image after being corrected step 2 using vertical and horizontal partition strategy is evenly divided into test module, and test module is minimum ROI image;Step 4, composite mask:Processing is masked to the test module after segmentation using compound logic operation method;Test module after mask process is transformed into hsv color space by step 5, acetes chinensis, is generated color characteristic and is compared with standard value, determines ceramic tile and whether there is color defect.Present invention combination affine transformation, piecemeal processing, compound mask, color space, Feature Extraction Technology complete the visual color detection of ceramic tile, and the detected representation is good, and solving the problems, such as can not the intrinsic color acetes chinensis of exact representation ceramic tile.

Description

Ceramic tile coloration piecemeal detection method based on machine vision
Technical field
The ceramic tile coloration piecemeal detection method based on machine vision that the present invention relates to a kind of.
Background technology
At present in industrial processes, ceramic tile acetes chinensis, which mainly has, manually visually observes completion, and this method labour is strong Degree is big, is influenced by subjective factor, manually at being gradually increased, has been unable to meet the needs of modern automation production;Also there is utilization Chromaticity detector carries out the correlation technique of ceramic tile acetes chinensis, as speed detector relies primarily on the movement of horizontal guide rail structure to mesh Mark is scanned, and sweep speed is relatively slow and colorimetric detection excessively relies on production firm's color standard, it is difficult to according to actual product Color is changed and adapts to;The method of the ceramic tile acetes chinensis of view-based access control model is now also relatively more, but proposed method There are larger limitations, are mainly manifested in following points:
(1) it before ceramic tile detection, needs accurately to position detection ceramic tile, the color characteristic to count ceramic tile is believed Breath, but still can not distinguish the interference characteristic of edge neighborhood Pixel-level, to when carrying out color characteristic, unavoidably bring into The influence of environmental factor;
(2) statistics is mainly based upon global information and carries out color characteristic statistics, perception of this feature to local colour switching Ability very little, i.e. global information statistics can dilute the expressive ability of local aberration transformation, therefore the precision of acetes chinensis and standard Exactness can all be affected;
(3) selection of color space will produce prodigious influence to acetes chinensis, and there is presently no general color spaces It is used by all product acetes chinensis, is only selected according to the actual demand of product.Based on current ceramic tile acetes chinensis The present situation and engineering background of industry, this patent propose a kind of based on piecemeal compound mask chromaticity distortion detection algorithm.
Invention content
The present invention ties to solve the above problems, provide a kind of ceramic tile coloration piecemeal detection method based on machine vision Affine transformation, piecemeal processing, compound mask, color space, Feature Extraction Technology are closed, the visual color detection of ceramic tile is completed, it should Detected representation is good, solves traditional detection method because limitation and defect can not the intrinsic color aberration inspections of exact representation ceramic tile Survey problem.
To achieve the above object, the technical solution adopted by the present invention is:
Ceramic tile coloration piecemeal detection method based on machine vision, includes the following steps:
Step 1, Image Acquisition and positioning
Tile image is acquired by color camera, then is schemed the ROI only containing ceramic tile by ceramic tile location algorithm As splitting, subsequent processing is carried out as independent processing unit, the ROI image includes whole tile frontier district The image in domain;
Step 2, the correction of image pose
Using based on geometric transformation is carried out on the basis of ROI image tiltedly external square diagonal line, to correct ceramic tile pose;
Step 3, image block
ROI image after being corrected step 2 using vertical and horizontal partition strategy is evenly divided into test module, and test module is most Small ROI image;
Step 4, composite mask
Processing is masked to the test module after segmentation using compound logic operation method;
Step 5, acetes chinensis
Test module after mask process is transformed into hsv color space, generate color characteristic and is compared with standard value, is sentenced Do not go out ceramic tile and whether there is color defect.
The step 1 specifically includes following steps:
Step 11, image is acquired by high speed linear array CCD camera;
Step 12, first gray level image, then it is filtered denoising, filtering figure is divided using edge detection algorithm, Small tiles profile is extracted again, obtains ceramic tile profile diagram;
Step 13, the geometrical property of ceramic tile profile generates corresponding primitive feature, primitive in the profile diagram based on step 12 Feature includes width, height and integrity degree;Corresponding hsv color space characteristics, HSV are generated using the color characteristics of ceramic tile itself Color space characteristic includes tone and saturation degree, primitive feature and color characteristic is then configured to bit combination feature, jointly Complete the positioning of ceramic tile;
Step 14, it for the tile image after positioning, is generated and is corresponded on the basis of the angle point of the boundary rectangle of ceramic tile profile ROI image.
ROI image is subjected to step 2 geometric transformation, formula is:
In formula, θcIt is the rotation angle of geometric transformation, Δ x, Δ y are correction translation , [x,y 1]For coordinate , &#91 before transformation;x1 y11]For the coordinate after transformation.
The step 3 specifically includes following steps:
Step 31:Image after correction is re-started into contours extract, obtains the minimum ROI image for being close to ceramic tile target, Using the image origin as the starting point of piecemeal, piecemeal step-length is initialized, the definition of piecemeal step-length is:
StepxWith StepyIt is the integer taken after calculating, Scale is the scale of step size computation Coefficient;
Minimum ROI image origin is as piecemeal starting point using after correction for step 32, then respectively laterally and longitudinally right with its The step-length answered is divided into row block, completes the partiting step of entire ceramic tile.
Step 32 dividing mode is:
Minimum ROI image is divided into 0th intermediate area, 2nd area and 1st area and 2 in 1st area and upper and lower both sides at left and right sides of 0th area 3rd area that area intersects, boundary condition are divided into 4 kinds of regions, and the discriminant function using following g (i, j) as boundary condition is solved Analysis:
The discriminant function is expressed as:
If g (i, j)=1, represents and occur laterally to cross the border in piecemeal ergodic process, be in the piecemeal size of critical zone The Fan Weiwei &#91 of width;I, Width];
If g (i, j)=2, represents the generation longitudinal direction in piecemeal ergodic process and cross the border, be in the piecemeal size of critical zone The Fan Weiwei &#91 of height;J, Height];
If g (i, j)=3, represents in piecemeal ergodic process while transverse and longitudinal occurs and cross the border, point in critical zone The range Fen Biewei &#91 of block size width and height;I, Width]With [J, Height];
If g (i, j)=0, represent without crossing the border in piecemeal ergodic process, the range of width and height is respectively [I, i+Stepx];With [J, j+Stepy];
And it defines:When g (i, j)={ 1,2,3 }, the region of division is external piecemeal, and region when g (i, j)=0 is interior Partial block, internal piecemeal be need not carry out pixel differentiate processing part, external piecemeal just needs differentiate handle be need into Row pixel differentiates the part of processing.
The step 4 specifically includes following steps:
Step 41:It initializes two width and divides the image that ROI sizes are identical and pixel value is 0, it is compound respectively as ceramic tile The parent of mask is denoted as M1, M2;
Step 42:Correction profile in ceramic tile blocking step is drawn in M1 respectively with pixel precision, in M2 mask images, filling Mask parent contoured interior and perimeter;Filler pixels are RGB (255,255,255) i.e. inside M1 image outlines, external For RGB (0,0,0);The inside and outside portion's filler pixels of M2 are RGB (255,255,255) and RGB (255,0,0);
Step 43:Image after pose is corrected makees logic and operation with compound mask image M1, M2 respectively, is handled Keep the image of ceramic tile contoured interior complete after mask region of interest area image I1 and I2 afterwards, interior mask and correcting image processing Portion retains, and external background colour is respectively black and red.
Step 44:When g (i, j)={ 1,2,3 } in ceramic tile blocking step, piecemeal is in critical edge dividing value, due to nothing Method ensures the side of ceramic tile and being completely superposed for segmentation ROI image, need to carry out the differentiation processing of ceramic tile inside and outside pixel, decision rule For:If the value in boundary point pixel in the block in I1 and I2 meet simultaneously I1 (i, j)=RGB (0,0,0) and I1 (i, j)= RGB (255,0,0), then the pixel value is to mix background pixel boundary is point in the block, is otherwise the pixel on ceramic tile.
Step 5 acetes chinensis is specially:
ROI image after piecemeal and mask is transformed into hsv color space, the hsv color spatial component life based on weight At color characteristic, expression formula is as follows:
Fti=(λ1×H+λ2×S)/N
FtiIndicate that the color characteristic that i-th of piecemeal generates, H indicate that chrominance component, corresponding weights are λ1, S expression saturations The corresponding weights component λ of degree2, N indicates the number of pixels that traverses in corresponding blocks, takes λ1=0.7 or λ2=0.3;
Step 52:Calculate the ceramic tile color characteristic collection F { F generatedti|Fti, i=1,2 ... N, k ∈ N+ and N >=1 }, standard Ceramic tile color characteristic is Fm, the expression formula of acetes chinensis is:
ΔEti=|Fti-Fm|
The differentiation of positioning target is carried out using the method for threshold value, discrimination formula is as follows.
T is the bound of threshold value, g (Δ Eti)=1 indicates that misalignment, monoblock is not present in the block position of the ceramic tile When corresponding the g () function of all pieces of ceramic tile is 1, just judge that misalignment is not present in the ceramic tile, if any block therein corresponds to G ()=0, then differentiate that there are chromaticity distortions for the ceramic tile.
After adopting the above technical scheme, the present invention has the following advantages:
1, ceramic tile Target Segmentation is become by uniform detection module using vertical and horizontal partition strategy, overcomes traditional global information Feature can not perceive the defect of small chromatic aberration, can protrude the change information of local aberration;
2, using based on ceramic tile profile, tiltedly external square diagonal line carries out the ceramic tile pose of geometric transformation and corrects mode, ensure horizontal The effect of perpendicular partition strategy;
3, the problem of tile boundary influences color characteristic statistics can be overflowed for blocking unit, is transported using compound mask logic The statistics that the non-ceramic tile pixel inside the piecemeal that makes to cross the border is not involved in color characteristic is calculated, to ensure the accurate of color expressing feature Property;
4, it generates color characteristic to dividing the carry out acetes chinensis of block using hsv color space and is carried out pair with standard value Than determining ceramic tile chromatic aberration defect, and the position of defect can be accurately positioned.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and constitutes the part of the present invention, this hair Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings:
Fig. 1 is the ceramic tile coloration separate detection method flow schematic diagram the present invention is based on machine vision;
Fig. 2 is the geometric representation of tile image correction of the present invention;
Fig. 3 is that piecemeal of the present invention shows intention;
Fig. 4 is ceramic tile acetes chinensis figure of the present invention.
Specific implementation mode
In order to keep technical problems, technical solutions and advantages to be solved clearer, clear, tie below Closing accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used To explain the present invention, it is not intended to limit the present invention.
The ceramic tile coloration piecemeal detection method based on machine vision that the present invention as shown in Figure 1 discloses, includes the following steps:
Step 1, Image Acquisition and positioning, step 1 specifically include following steps:
Step 11, image is acquired by high speed linear array CCD camera;
Step 12, first gray level image, then it is filtered denoising, filtering figure is divided using edge detection algorithm, Small tiles profile is extracted again, obtains ceramic tile profile diagram;
Step 13, the geometrical property of ceramic tile profile generates corresponding primitive feature, primitive in the profile diagram based on step 12 Feature includes width, height and integrity degree;Corresponding hsv color space characteristics, HSV are generated using the color characteristics of ceramic tile itself Color space characteristic includes tone and saturation degree, primitive feature and color characteristic is then configured to bit combination feature, jointly Complete the positioning of ceramic tile;
Step 14, it for the tile image after positioning, is generated and is corresponded on the basis of the angle point of the boundary rectangle of ceramic tile profile ROI image.
ROI image is subjected to step 2 geometric transformation, formula is:
In formula, θcIt is the rotation angle of geometric transformation, Δ x, Δ y are correction translation , [x,y 1]For coordinate , &#91 before transformation;x1 y11]For the coordinate after transformation.
Step 2, the correction of image pose
Using based on geometric transformation is carried out on the basis of ROI image tiltedly external square diagonal line, to correct ceramic tile pose;Correction Geometric representation is as shown in Figure 2.
If the oblique boundary rectangle of normal place ceramic tile is ABCD, diagonal line intersection point is p (xp,yp), diagonal line BD and pixel The angular separations W of coordinate are that the coordinate of θ, B and D point is set to (xB,yB), (xD,yD), similarly set either objective position ceramic tile Oblique boundary rectangle be A1B1C1D1, diagonal line intersection point p1(xp1,yp1), cornerwise B1D1, the angular separations W with pixel coordinate For θ1, B1With D1The coordinate of point is set to (xB1, yB1),(xD1, yD1), W and H respectively represent the horizontal axis and the longitudinal axis of pixel coordinate, Correction calculates and is subject to pixel dimension, and correction translation is set as Δ x, Δ y, and rotation angle is set as θc, geometric transformation formula is:
In formula, θcIt is the rotation angle of geometric transformation, Δ x, Δ y are correction translation , [x,y 1]For coordinate , &#91 before transformation;x1 y11]For the coordinate after transformation.
Step 3, image block, step 3 specifically include following steps:
Step 31:Image after correction is re-started into contours extract, obtains the minimum ROI image for being close to ceramic tile target (being considered tile image when the image procossing) initializes piecemeal step-length, piecemeal step-length using the image origin as the starting point of piecemeal Definition be:
StepxWith StepyIt is the integer taken after calculating, Scale is the scale of step size computation Coefficient;It is worth that the smaller precision for representing piecemeal is higher, and the time complexity of algorithm can also improve, and general value is 0.1;
Step 32, minimum ROI image origin is as piecemeal starting point using after correction, then respectively laterally and longitudinally right with its The step-length answered is divided into row block, completes the partiting step of entire ceramic tile.
But in actual division engineering, it is difficult to ensure that image length and width are the integral multiples of piecemeal step-length, to prevent piecemeal Generation processing of crossing the border is abnormal, in addition following criterion:
As shown in figure 3, minimum ROI image is divided into 0th intermediate area, 2nd area in 1st area and upper and lower both sides at left and right sides of 0th area And 1 3rd area for intersecting with 2nd area of area, boundary condition are divided into 4 kinds of regions, the differentiation using following g (i, j) as boundary condition Function is parsed:
The discriminant function is expressed as:
If g (i, j)=1, represents and occur laterally to cross the border in piecemeal ergodic process, be in the piecemeal size of critical zone The Fan Weiwei &#91 of width;I, Width];
If g (i, j)=2, represents the generation longitudinal direction in piecemeal ergodic process and cross the border, be in the piecemeal size of critical zone The Fan Weiwei &#91 of height;J, Height];
If g (i, j)=3, represents in piecemeal ergodic process while transverse and longitudinal occurs and cross the border, point in critical zone The range Fen Biewei &#91 of block size width and height;I, Width]With [J, Height];
If g (i, j)=0, represent without crossing the border in piecemeal ergodic process, the range of width and height is respectively [I, i+Stepx];With [J, j+Stepy];
And it defines:When g (i, j)={ 1,2,3 }, the region of division is external piecemeal, and region when g (i, j)=0 is interior Partial block, internal piecemeal be need not carry out pixel differentiate processing part, external piecemeal just needs differentiate handle be need into Row pixel differentiates the part of processing.
By above algorithm flow, the uniform piecemeal to ceramic tile is completed, the scale of piecemeal is successfully solved and crosses the border Abnormal problem provides a kind of new strategy to highlight local chromatic aberration;
Step 4, composite mask, specifically include following steps:
Step 41:It initializes two width and divides the image that ROI sizes are identical and pixel value is 0, it is compound respectively as ceramic tile The parent of mask is denoted as M1, M2;
Step 42:Correction profile in ceramic tile blocking step is drawn in M1 respectively with pixel precision, in M2 mask images, filling Mask parent contoured interior and perimeter;Filler pixels are RGB (255,255,255) i.e. inside M1 image outlines, external For RGB (0,0,0);The inside and outside portion's filler pixels of M2 are RGB (255,255,255) and RGB (255,0,0);
Step 43:Image after outer pose is corrected makees logic and operation with compound mask image M1, M2 respectively, obtains everywhere Enable the image of ceramic tile contoured interior after mask region of interest area image I1 and I2 after reason, interior mask and correcting image processing All retain, external background colour is respectively black and red.
Step 44:When g (i, j)={ 1,2,3 } in ceramic tile blocking step, piecemeal is in critical edge dividing value, due to nothing Method ensures the side of ceramic tile and being completely superposed for segmentation ROI image, need to carry out the differentiation processing of ceramic tile inside and outside pixel, decision rule For:If the value in boundary point pixel in the block in I1 and I2 meet simultaneously I1 (i, j)=RGB (0,0,0) and I1 (i, j)= RGB (255,0,0), then the pixel value is to mix background pixel boundary is point in the block, is otherwise the pixel on ceramic tile.It is above-mentioned Rule of judgment only carry out pixel differentiation processing to being in boundary piecemeal, therefore the complexity of entire algorithm will not be increased, passed through The logical calculation method of above-mentioned compound mask can fully achieve the generation that non-targeted pixel is strictly not involved in color characteristic Target.
Geometry rectification only is carried out to ceramic tile and is not sufficient to ensure that the non-targeted pixel for the piecemeal that crosses the border strictly is not involved in color characteristic Generation because the loss of significance in image processing process is inevitable, the boundary of ceramic tile can not possibly be with segmentation ROI figures As being completely superposed, mask is a kind of very practical technology in image topology processing, and maximum is characterized in that arbitrary shape can be controlled Area-of-interest, will all be shielded with unrelated feature interested, so that us is only concerned the image object of processing, in the present invention In, not only use the shielding characteristic of mask, it is often more important that differentiate side using " compound mask " logical calculation method proposed The non-targeted pixel of boundary's piecemeal, makes it strictly be not involved in the generation of color characteristic, to influence the accuracy of ceramic tile acetes chinensis;
Step 5, acetes chinensis
Test module after mask process is transformed into hsv color space, generate color characteristic and is compared with standard value, is sentenced Do not go out ceramic tile and whether there is color defect.
Step 5 acetes chinensis is specially:
ROI image after piecemeal and mask is transformed into hsv color space, the hsv color spatial component life based on weight At color characteristic, expression formula is as follows:
Fti=(λ1×H+λ2×S)/N
FtiIndicate that the color characteristic that i-th of piecemeal generates, H indicate that chrominance component, corresponding weights are λ1, S expression saturations The corresponding weights component λ of degree2, N indicates the number of pixels that traverses in corresponding blocks, takes λ1=0.7 or λ2=0.3;
Step 52:Calculate the ceramic tile color characteristic collection F { F generatedti|Fti, i=1,2 ... N, k ∈ N+ and N >=1 }, standard Ceramic tile color characteristic is Fm, the expression formula of acetes chinensis is:
ΔEti=|Fti-Fm|
The differentiation of positioning target is carried out using the method for threshold value, discrimination formula is as follows.
T is the bound of threshold value, g (Δ Eti)=1 indicates that misalignment, monoblock is not present in the block position of the ceramic tile When corresponding the g () function of all pieces of ceramic tile is 1, just judge that misalignment is not present in the ceramic tile, if any block therein corresponds to G ()=0, then differentiate that there are chromaticity distortions for the ceramic tile.
Experiment detection is carried out to ceramic tile using detection method and finds that the method for detection of the invention can be effective Detect the position of ceramic tile color change, as shown in figure 4, the abscissa of statistical chart is the number of piecemeal, ordinate is characterized face Color value FtiValue after normalization.
The preferred embodiment of the present invention has shown and described in above description, it should be understood that the present invention is not limited to this paper institutes The form of disclosure is not to be taken as excluding other embodiments, and can be used for other combinations, modifications, and environments, and energy Enough in this paper invented the scope of the idea, modifications can be made through the above teachings or related fields of technology or knowledge.And people from this field The modifications and changes that member is carried out do not depart from the spirit and scope of the present invention, then all should be in the protection of appended claims of the present invention In range.

Claims (7)

1. the ceramic tile coloration piecemeal detection method based on machine vision, it is characterised in that:Include the following steps:
Step 1, Image Acquisition and positioning
Tile image is acquired by color camera, then is divided the ROI image only containing ceramic tile by ceramic tile location algorithm It cuts out, carries out subsequent processing as independent processing unit, the ROI image is comprising whole tile borderline region Image;
Step 2, the correction of image pose
Using based on geometric transformation is carried out on the basis of ROI image tiltedly external square diagonal line, to correct ceramic tile pose;
Step 3, image block
ROI image after being corrected step 2 using vertical and horizontal partition strategy is evenly divided into test module, and test module is minimum ROI image;
Step 4, composite mask
Processing is masked to the test module after segmentation using compound logic operation method;
Step 5, acetes chinensis
Test module after mask process is transformed into hsv color space, generate color characteristic and is compared with standard value, is determined Ceramic tile whether there is color defect.
2. the ceramic tile coloration piecemeal detection method based on machine vision as described in claim 1, it is characterised in that:The step 1 specifically includes following steps:
Step 11, image is acquired by high speed linear array CCD camera;
Step 12, first gray level image, then it is filtered denoising, filtering figure is divided using edge detection algorithm, then carries Small tiles profile is taken, ceramic tile profile diagram is obtained;
Step 13, the geometrical property of ceramic tile profile generates corresponding primitive feature, primitive feature in the profile diagram based on step 12 Including width, height and integrity degree;Corresponding hsv color space characteristics, hsv color are generated using the color characteristics of ceramic tile itself Space characteristics include tone and saturation degree, and primitive feature and color characteristic are then configured to bit combination feature, common to complete The positioning of ceramic tile;
Step 14, for the tile image after positioning, corresponding ROI is generated on the basis of the angle point of the boundary rectangle of ceramic tile profile Image.
3. the ceramic tile coloration piecemeal detection method based on machine vision as described in claim 1, it is characterised in that:ROI is schemed As carrying out step 2 geometric transformation, formula is:
In formula, θcIt is the rotation angle of geometric transformation, Δ x, Δ y are correction translation , [x,y 1]For coordinate , &#91 before transformation;x1y1 1] For the coordinate after transformation.
4. the ceramic tile coloration piecemeal detection method based on machine vision as described in claim 1, it is characterised in that:The step 3 specifically include following steps:
Step 31:Image after correction is re-started into contours extract, the minimum ROI image for being close to ceramic tile target is obtained, with this Image origin is the starting point of piecemeal, initializes piecemeal step-length, and the definition of piecemeal step-length is:
StepxWith StepyIt is the integer taken after calculating, Scale is the scale coefficient of step size computation;
Minimum ROI image origin is as piecemeal starting point using after correction for step 32, then respectively laterally and longitudinally corresponding with its Step-length is divided into row block, completes the partiting step of entire ceramic tile.
5. the ceramic tile coloration piecemeal detection method based on machine vision as claimed in claim 4, it is characterised in that:The step 32 dividing modes are:
Minimum ROI image is divided into 0th intermediate area, 2nd area and 1st area and 2nd area in 1st area and upper and lower both sides at left and right sides of 0th area are handed over 3rd area of fork, boundary condition are divided into 4 kinds of regions, and the discriminant function using following g (i, j) as boundary condition is parsed:
The discriminant function is expressed as:
If g (i, j)=1, represents and occur laterally to cross the border in piecemeal ergodic process, be in the piecemeal size width of critical zone Fan Weiwei [I, Width];
If g (i, j)=2, represents the generation longitudinal direction in piecemeal ergodic process and cross the border, be in the big low height of piecemeal of critical zone Fan Weiwei [J, Height];
If g (i, j)=3, represents in piecemeal ergodic process while transverse and longitudinal occurs and cross the border, the piecemeal in critical zone is big The range Fen Biewei &#91 of small width and height;I, Width]With [J, Height];
If g (i, j)=0, represent without crossing the border in piecemeal ergodic process, the range Fen Biewei &#91 of width and height;I, i +Stepx];With [J, j+Stepy];
And it defines:When g (i, j)={ 1,2,3 }, the region of division is external piecemeal, and region when g (i, j)=0 is inside points Block, internal piecemeal are the part that need not be carried out pixel and differentiate processing, and external piecemeal just needs to differentiate processing to need to carry out picture Element differentiates the part of processing.
6. the ceramic tile coloration piecemeal detection method based on machine vision as claimed in claim 5, it is characterised in that:The step 4 specifically include following steps:
Step 41:It initializes two width and divides the image that ROI sizes are identical and pixel value is 0, respectively as ceramic tile compound mask Parent, be denoted as M1, M2;
Step 42:Correction profile in ceramic tile blocking step is drawn in M1 with pixel precision respectively, in M2 mask images, fills mask Parent contoured interior and perimeter;Filler pixels are RGB (255,255,255) i.e. inside M1 image outlines, and outside is RGB (0,0,0);The inside and outside portion's filler pixels of M2 are RGB (255,255,255) and RGB (255,0,0);
Step 43:Image after pose is corrected makees logic and operation with compound mask image M1, M2 respectively, obtains that treated Enable the whole guarantors of the image of ceramic tile contoured interior after mask region of interest area image I1 and I2, interior mask and correcting image processing It stays, external background colour is respectively black and red;
Step 44:When g (i, j)={ 1,2,3 } in ceramic tile blocking step, piecemeal is in critical edge dividing value, due to that can not protect The side of ceramic tile and being completely superposed for segmentation ROI image are demonstrate,proved, the differentiation processing of ceramic tile inside and outside pixel need to be carried out, decision rule is: If the value in boundary point pixel in the block in I1 and I2 meets I1 (i, j)=RGB (0,0,0) and I1 (i, j)=RGB simultaneously (255,0,0), then the pixel value is to mix background pixel boundary is point in the block, is otherwise the pixel on ceramic tile.
7. the ceramic tile coloration piecemeal detection method based on machine vision as described in claim 1, it is characterised in that:The step 5 acetes chinensis are specially:
ROI image after piecemeal and mask is transformed into hsv color space, the hsv color spatial component based on weight generates face Color characteristic, expression formula are as follows:
Fti=(λ1×H+λ2×S)/N
FtiIndicate that the color characteristic that i-th of piecemeal generates, H indicate that chrominance component, corresponding weights are λ1, S expression saturation degrees pair Answer weights component λ2, N indicates the number of pixels that traverses in corresponding blocks, takes λ1=0.7 or λ2=0.3;
Step 52:Calculate the ceramic tile color characteristic collection F { F generatedti|Fti, i=1,2 ... N, k ∈ N+ and N >=1 }, standard ceramic tile face Color characteristic is Fm, the expression formula of acetes chinensis is:
ΔEti=|Fti-Fm|
The differentiation of positioning target is carried out using the method for threshold value, discrimination formula is as follows:
T is the bound of threshold value, g (Δ Eti)=1 indicates that misalignment, whole tile is not present in the block position of the ceramic tile When all pieces of corresponding g () functions are 1, just judge that misalignment is not present in the ceramic tile, if the corresponding g of any block therein ()=0 then differentiates that there are chromaticity distortions for the ceramic tile.
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