CN107102007B - Pattern consistency recognition methods in cloth detection - Google Patents
Pattern consistency recognition methods in cloth detection Download PDFInfo
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- CN107102007B CN107102007B CN201710463911.1A CN201710463911A CN107102007B CN 107102007 B CN107102007 B CN 107102007B CN 201710463911 A CN201710463911 A CN 201710463911A CN 107102007 B CN107102007 B CN 107102007B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
- G01N21/8983—Irregularities in textured or patterned surfaces, e.g. textiles, wood for testing textile webs, i.e. woven material
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
In order to avoid cloth buyer can not quickly and accurately screen the defect of the cloth quality of the complex pattern of dyeing preparation of piece goods or spray printing or the pattern of fringe spacing very little in purchase, the present invention provides the pattern consistency recognition methods in a kind of detection of cloth, it include: that cloth to be detected is set on the conveyer belt of one-way movement by (1), the direction of motion of the conveyer belt and the length direction of cloth are consistent;(2) multiple labels extended perpendicular to cloth surface are set on cloth to be detected;(3) obtaining has the cloth reference picture of the shade of the label determines whether cloth pattern is consistent according to the cloth reference picture.This method overcomes the drawbacks of needing to expend great amount of images processing time and image processing machine resource in the prior art existing for the image analysis algorithm for often relying on generally use in the prior art, can quickly and accurately realize the detection of cloth pattern consistency.
Description
Technical field
The present invention relates to technical field of textile production, know more particularly, to the pattern consistency in a kind of detection of cloth
Other method.
Background technique
With the raising that people require the aesthetics and complexity of cloth decorative pattern, print and dye on cloth or the pattern of spray printing such as
There is some slight misalignment or deformation in fruit, will lead to the significant wastage in raw material and working hour.Especially for small compared with standard cloth size
And need the cloth or size of printing and dyeing or spray printing complex pattern larger and the cloth of printing and dyeing or the lesser pattern of spray printing fringe spacing
, when printing and dyeing or jet printing process needs to complete the printing and dyeing of multiple tracks difference or jet printing technique on cloth, difference is printed and dyed or spray printing work
Skill needs cloth carrying out accurate position restriction to each other.For example, for it is expected printing and dyeing or spray printing in some side of cloth
When a variety of pairs of techniques require different stripeds, need to make cloth by multiple and different printing and dyeing or spatterwork line, each printing and dyeing
Or spatterwork line completes printing and dyeing or the spray printing of the different candy strips under different technology conditions.Per pass printing and dyeing or jet printing technique
At the end of, it is desirable that cloth is carried out transverse shifting preset distance in the direction of advance relative to printing and dyeing or spray printing line, once distance
Difference, then pattern of the cloth completed by multiple tracks printing and dyeing or jet printing technique in side will be unable to reach expected, become substandard products
Even unqualified cloth.Then, desirably cloth, can be real-time during being moved along production line in the prior art
Ground knows whether it is laterally moved expected distance or do not occurred as desired transverse to cloth direction of advance
Displacement.
The above situation it is particularly disadvantageous in cloth buyer (for example, cloth manufactured after be purchased when purchase manufacturer)
Examine the demand of the quality of the cloth of the complex pattern for the above two situation having.Once being made into the products such as ready-made clothes, then originally
The style of body excellent in design then may cause the reduction of finished product aesthetics due to above-mentioned displacement or dislocation.
Through retrieving, Defect Detection and tension adjustment side are related generally to the detection of cloth in process of production in the prior art
Face, for example, application No. is the Chinese invention patent applications of CN201310522031 to disclose a kind of cross embroidery Numerical Control Printer cloth
Location information real-time correction method, bearing calibration are as follows: a. is whole to read camera acquired image information in real time;B. to figure
As be filtered, binaryzation, contours extract, square hole identifying processing, obtain the ranks coordinate information of each square hole;C. it obtains each
The actual physics coordinate of square hole central point;D. the actual physics coordinate of square hole central point vision guide locating module is supplied to make
For benchmark reference point, accurately cloth texture information is obtained;E., the texture information is supplied to the drive module of inkjet print head.
For another example, one kind is disclosed application No. is the Chinese invention patent application of CN201410467061 to convert based on adaptive orthogonal wavelet
Fabric Defects Inspection detection method and device, replace artificial range estimation and original first by manually carrying out the selection of wavelet basis, then into
Automatic defect inspection method of the row based on wavelet transformation, overcome traditional artificial range estimation detection speed slowly, low efficiency, erroneous detection, leakage
The defects of inspection rate is high and drawn in the original defect detection method based on wavelet transformation by not optimized to wavelet basis
The not high problem of the detection accuracy risen.
However, above-mentioned technical proposal can not solve drawbacks described above in the prior art.
Summary of the invention
In order to avoid cloth buyer can not quickly and accurately screen the complex pattern of dyeing preparation of piece goods or spray printing in purchase
Or the defect of the cloth quality of the pattern of fringe spacing very little, the present invention provides the pattern consistency knowledges in a kind of detection of cloth
Other method, comprising:
(1) cloth to be detected is set on the conveyer belt of one-way movement, the direction of motion of the conveyer belt and the length of cloth
It is consistent to spend direction;
(2) multiple labels extended perpendicular to cloth surface are set on cloth to be detected;
(3) obtaining, there is the cloth reference picture of the shade of the label to determine cloth according to the cloth reference picture
Whether pattern is consistent.
Further, the label in the step (2) is arranged in Fabric Defects Inspection.
Further, the step (3) includes:
(31) multiple sets of light sources is set around conveyer belt, and the light source can issue the Line of light of one-way;
(32) cloth to be detected first position on a moving belt and the second place are irradiated using the light source,
The first cloth reference picture and the second cloth reference picture are acquired respectively at two positions to cloth to be detected simultaneously;
(33) information of cloth label is determined according to the first cloth reference picture and the second cloth reference picture.
Further, the step (31) includes:
(311) one group of light source, the one group of light source is arranged in the first side at the first position on a moving belt
For irradiating the cloth to be detected on conveyer belt from the first side;
(312) second group of light source is arranged in second side of the second place on a moving belt, wherein the first side and the
Two sides are not ipsilateral for opposite two, and second group of light source is used for from the cloth to be detected on second side irradiation conveyer belt.
Further, the step (32) includes:
(321) the first image collecting device and the second figure is respectively set above the first position and the second position
As acquisition device, described image acquisition device is used to the cloth reference picture that acquisition is disposed below;
(322) at the first moment, the one group of light source is since the opposite direction of conveyer belt direction of advance, towards conveyer belt
Direction of advance rotates 180 ° in the plane for the direction of advance for being parallel to conveyer belt, the one group of light source during this 180 °
The cloth to be detected of irradiation always;
(323) during one group of light source rotation, the first image collecting device is with the figure of first frequency acquisition cloth
As being used as the first cloth reference picture;
(324) at the second moment, second group of light source is since conveyer belt direction of advance, towards the anti-of transmission tape travel
Direction rotates 180 ° in the plane for the direction of advance for being parallel to conveyer belt, the beginning of second group of light source during this 180 °
Cloth to be detected is irradiated eventually, and at the second moment, the one group of light source has completed 180 ° of rotations;
(325) during second group of light source rotation, the second image collecting device is with the figure of second frequency acquisition cloth
As being used as the second cloth reference picture.
Further, the first frequency is identical with the second frequency.
Further, the step (31) further include:
(313) plane locating for the cloth of direction provides ambient lighting light on a moving belt.
Further, the step (33) includes:
(3301) determine the first image acquisition device collected the during the one group of light source rotates 180 °
One cloth reference picture and the last one cloth reference picture;
(3302) time for being acquired according to conveyer belt transmission speed and the last one described cloth reference picture and described the
One cloth reference picture acquisition time between time difference, obtain cloth the first image acquisition device acquisition during
The length moved on conveyer belt;
(3303) according to first cloth reference picture and the last one cloth reference picture and pre-stored packet
It includes the length that the cloth image of cloth pattern is matched, and moved on a moving belt in conjunction with the cloth, determines described the
The corresponding practical cloth pattern image of the first image acquisition device acquired image during one group of light source rotates 180 °;
(3304) based on first cloth reference picture and the last one cloth reference picture and pre-stored packet
Include cloth pattern cloth image carry out it is matched as a result, obtain it is collected from the first image acquisition device, remove the
One cloth reference picture reality corresponding with other each cloth reference pictures except the last one cloth reference picture
Border cloth pattern image;
(3305) collected from the first image acquisition device, remove first cloth reference picture and the last one
In other cloth reference pictures except cloth reference picture, the corresponding practical cloth figure of these cloth reference pictures is removed
Case image obtains multiple label shadow images;
(3306) based on label each in first label shadow image in chronological order in one group of light source
The lower shade generated of irradiation, determines the neighborhood of the predefined size around each shade region;
(3307) each label determined in shadow image is marked to generate under one group of light source irradiation based at one
The neighborhood of predefined size around shade region calculates remaining each label shadow image in multiple label shadow images
The sum of shaded area in the neighborhood, by this and as the first reference value of label;
(3308) determine second image collecting device collected the during second group of light source rotates 180 °
Two cloth reference pictures and the last one cloth reference picture;
(3309) time for being acquired according to conveyer belt transmission speed and the last one described cloth reference picture and described the
Two cloth reference pictures acquisition time between time difference, obtain cloth during second image acquisition device
The length moved on conveyer belt;
(3310) according to second cloth reference picture and the last one cloth reference picture and pre-stored packet
It includes the length that the cloth image of cloth pattern is matched, and moved on a moving belt in conjunction with the cloth, determines described the
The corresponding practical cloth pattern image of image that second image acquisition device arrives during two groups of light sources rotate 180 °;
(3311) based on second cloth reference picture and the last one cloth reference picture and pre-stored packet
Include cloth pattern cloth image carry out it is matched as a result, obtain from second image acquisition device to, remove the
Two cloth reference pictures reality corresponding with other each cloth reference pictures except the last one cloth reference picture
Border cloth pattern image;
(3312) from second image acquisition device to, remove second cloth reference picture and the last one
In other cloth reference pictures except cloth reference picture, the corresponding practical cloth figure of these cloth reference pictures is removed
Case image obtains multiple label shadow images;
(3313) based on label each in second label shadow image in chronological order in second group of light source
The lower shade generated of irradiation, determines the neighborhood of the predefined size around each shade region;
(3314) each label determined in shadow image is marked to generate in the case where second group of light source irradiates based at one
The neighborhood of predefined size around shade region calculates remaining each label shadow image in multiple label shadow images
The sum of shaded area in the neighborhood, by this and as the second reference value of label;
(3315) when the absolute value of the difference of first reference value of label and the second reference value of label is more than preset threshold,
Indicate that cloth pattern is inconsistent.
Further, the one group of light source and second group of light source height apart from plane where cloth on a moving belt
It spends not identical.
Further, the one group of light source and second group of light source are in the direction perpendicular to the transmission tape travel
Height than fault to be detected is high.
The beneficial effects of the present invention are:
(1) it overcomes and is needed existing for the image analysis algorithm for often relying on generally use in the prior art in the prior art
The drawbacks of expending great amount of images processing time and image processing machine resource;
(2) the graphic image data processing operand in cloth pattern consistency identification process is reduced;
(3) algorithm complexity that cloth pattern consistency determines is reduced;
(4) detection of cloth pattern consistency can be quickly and accurately realized.
Detailed description of the invention
Fig. 1 shows the flow chart of the pattern consistency recognition methods in cloth detection according to the present invention.
Specific embodiment
As shown in Figure 1, the present invention provides the pattern consistency recognition methods in a kind of detection of cloth, comprising:
(1) cloth to be detected is set on the conveyer belt of one-way movement, the direction of motion of the conveyer belt and the length of cloth
It is consistent to spend direction;
(2) multiple labels extended perpendicular to cloth surface are set on cloth to be detected;
(3) obtaining, there is the cloth reference picture of the shade of the label to determine cloth according to the cloth reference picture
Whether pattern is consistent.
Preferably, the label in the step (2) is arranged in Fabric Defects Inspection.
Preferably, the step (3) includes:
(31) multiple sets of light sources is set around conveyer belt, and the light source can issue the Line of light of one-way;
(32) cloth to be detected first position on a moving belt and the second place are irradiated using the light source,
The first cloth reference picture and the second cloth reference picture are acquired respectively at two positions to cloth to be detected simultaneously;
(33) information of cloth label is determined according to the first cloth reference picture and the second cloth reference picture.
Preferably, the step (31) includes:
(311) one group of light source, the one group of light source is arranged in the first side at the first position on a moving belt
For irradiating the cloth to be detected on conveyer belt from the first side;
(312) second group of light source is arranged in second side of the second place on a moving belt, wherein the first side and the
Two sides are not ipsilateral for opposite two, and second group of light source is used for from the cloth to be detected on second side irradiation conveyer belt.
Preferably, the step (32) includes:
(321) the first image collecting device and the second figure is respectively set above the first position and the second position
As acquisition device, described image acquisition device is used to the cloth reference picture that acquisition is disposed below;
(322) at the first moment, the one group of light source is since the opposite direction of conveyer belt direction of advance, towards conveyer belt
Direction of advance rotates 180 ° in the plane for the direction of advance for being parallel to conveyer belt, the one group of light source during this 180 °
The cloth to be detected of irradiation always;
(323) during one group of light source rotation, the first image collecting device is with the figure of first frequency acquisition cloth
As being used as the first cloth reference picture;
(324) at the second moment, second group of light source is since conveyer belt direction of advance, towards the anti-of transmission tape travel
Direction rotates 180 ° in the plane for the direction of advance for being parallel to conveyer belt, the beginning of second group of light source during this 180 °
Cloth to be detected is irradiated eventually, and at the second moment, the one group of light source has completed 180 ° of rotations;
(325) during second group of light source rotation, the second image collecting device is with the figure of second frequency acquisition cloth
As being used as the second cloth reference picture.
Preferably, the first frequency is identical with the second frequency.
Preferably, the step (31) further include:
(313) plane locating for the cloth of direction provides ambient lighting light on a moving belt.
Preferably, the step (33) includes:
(3301) determine the first image acquisition device collected the during the one group of light source rotates 180 °
One cloth reference picture and the last one cloth reference picture;
(3302) time for being acquired according to conveyer belt transmission speed and the last one described cloth reference picture and described the
One cloth reference picture acquisition time between time difference, obtain cloth the first image acquisition device acquisition during
The length moved on conveyer belt;
(3303) according to first cloth reference picture and the last one cloth reference picture and pre-stored packet
It includes the length that the cloth image of cloth pattern is matched, and moved on a moving belt in conjunction with the cloth, determines described the
The corresponding practical cloth pattern image of the first image acquisition device acquired image during one group of light source rotates 180 °;
(3304) based on first cloth reference picture and the last one cloth reference picture and pre-stored packet
Include cloth pattern cloth image carry out it is matched as a result, obtain it is collected from the first image acquisition device, remove the
One cloth reference picture reality corresponding with other each cloth reference pictures except the last one cloth reference picture
Border cloth pattern image;
(3305) collected from the first image acquisition device, remove first cloth reference picture and the last one
In other cloth reference pictures except cloth reference picture, the corresponding practical cloth figure of these cloth reference pictures is removed
Case image obtains multiple label shadow images;
(3306) based on label each in first label shadow image in chronological order in one group of light source
The lower shade generated of irradiation, determines the neighborhood of the predefined size around each shade region;
(3307) each label determined in shadow image is marked to generate under one group of light source irradiation based at one
The neighborhood of predefined size around shade region calculates remaining each label shadow image in multiple label shadow images
The sum of shaded area in the neighborhood, by this and as the first reference value of label;
(3308) determine second image collecting device collected the during second group of light source rotates 180 °
Two cloth reference pictures and the last one cloth reference picture;
(3309) time for being acquired according to conveyer belt transmission speed and the last one described cloth reference picture and described the
Two cloth reference pictures acquisition time between time difference, obtain cloth during second image acquisition device
The length moved on conveyer belt;
(3310) according to second cloth reference picture and the last one cloth reference picture and pre-stored packet
It includes the length that the cloth image of cloth pattern is matched, and moved on a moving belt in conjunction with the cloth, determines described the
The corresponding practical cloth pattern image of image that second image acquisition device arrives during two groups of light sources rotate 180 °;
(3311) based on second cloth reference picture and the last one cloth reference picture and pre-stored packet
Include cloth pattern cloth image carry out it is matched as a result, obtain from second image acquisition device to, remove the
Two cloth reference pictures reality corresponding with other each cloth reference pictures except the last one cloth reference picture
Border cloth pattern image;
(3312) from second image acquisition device to, remove second cloth reference picture and the last one
In other cloth reference pictures except cloth reference picture, the corresponding practical cloth figure of these cloth reference pictures is removed
Case image obtains multiple label shadow images;
(3313) based on label each in second label shadow image in chronological order in second group of light source
The lower shade generated of irradiation, determines the neighborhood of the predefined size around each shade region;
(3314) each label determined in shadow image is marked to generate in the case where second group of light source irradiates based at one
The neighborhood of predefined size around shade region calculates remaining each label shadow image in multiple label shadow images
The sum of shaded area in the neighborhood, by this and as the second reference value of label;
(3315) when the absolute value of the difference of first reference value of label and the second reference value of label is more than preset threshold,
Indicate that cloth pattern is inconsistent.
Preferably, the one group of light source and second group of light source height apart from plane where cloth on a moving belt
It is not identical.
Preferably, the one group of light source and second group of light source compare in the direction perpendicular to the transmission tape travel
The height of fault to be detected wants high.
Above for the purpose that narration made by presently preferred embodiments of the present invention is to illustrate, and it is not intended to limit essence of the invention
Really it is disclosed form, learns and make an amendment or change to be possible based on above introduction or from the embodiment of the present invention
, embodiment is to explain the principle of the present invention and those skilled in the art being allowed to exist with various embodiments using the present invention
It is selected in practical application and narration, technical idea attempt of the invention is determined by claim and its equalization.
Claims (6)
1. the pattern consistency recognition methods in a kind of cloth detection, includes the following steps:
(1) cloth to be detected is set on the conveyer belt of one-way movement, the direction of motion of the conveyer belt and the length side of cloth
To consistent;
(2) multiple labels extended perpendicular to cloth surface are set on cloth to be detected;
(3) obtaining, there is the cloth reference picture of the shade of the label to determine cloth pattern according to the cloth reference picture
It is whether consistent;
Label in the step (2) is arranged in Fabric Defects Inspection;
The step (3) includes the following steps:
(31) multiple sets of light sources is set around conveyer belt, and the light source can issue the Line of light of one-way;
(32) cloth to be detected first position on a moving belt and the second place are irradiated using the light source, simultaneously
The first cloth reference picture and the second cloth reference picture are acquired respectively at two positions to cloth to be detected;
(33) information of cloth label is determined according to the first cloth reference picture and the second cloth reference picture;
The step (31) includes the following steps:
(311) one group of light source is arranged in the first side at the first position on a moving belt, and the one group of light source is used for
Cloth to be detected from the first side irradiation conveyer belt;
(312) second group of light source is arranged in second side of the second place on a moving belt, wherein the first side and second side
Not ipsilateral for opposite two, second group of light source is used for from the cloth to be detected on second side irradiation conveyer belt;
It is characterized in that, the step (32) includes the following steps:
(321) the first image collecting device is respectively set above the first position and the second position and the second image is adopted
Acquisition means, described image acquisition device are used to the cloth reference picture that acquisition is disposed below;
(322) at the first moment, the one group of light source is since the opposite direction of conveyer belt direction of advance, towards transmission tape travel
Direction rotates 180 ° in the plane for the direction of advance for being parallel to conveyer belt, the beginning of the one group of light source during this 180 °
Cloth to be detected is irradiated eventually;
(323) during one group of light source rotation, the first image collecting device is made with the image of first frequency acquisition cloth
For the first cloth reference picture;
(324) at the second moment, second group of light source is since conveyer belt direction of advance, towards the negative side of transmission tape travel
To rotating 180 ° in the plane for the direction of advance for being parallel to conveyer belt, second group of light source are always during this 180 °
Cloth to be detected is irradiated, and at the second moment, the one group of light source has completed 180 ° of rotations;
(325) during second group of light source rotation, the second image collecting device is made with the image of second frequency acquisition cloth
For the second cloth reference picture.
2. the method according to claim 1, wherein the first frequency is identical with the second frequency.
3. according to the method described in claim 2, it is characterized in that, the step (31) further includes following steps:
(313) plane locating for the cloth of direction provides ambient lighting light on a moving belt.
4. according to the method described in claim 3, it is characterized in that, the step (33) includes the following steps:
(3301) determine the first image acquisition device collected first during the one group of light source rotates 180 °
Cloth reference picture and the last one cloth reference picture;
(3302) according to the time and first cloth of conveyer belt transmission speed and the acquisition of the last one described cloth reference picture
Time difference between the time of reference picture acquisition obtains cloth and is transmitting during the acquisition of the first image acquisition device
Take mobile length;
(3303) according to first cloth reference picture and the last one cloth reference picture and it is pre-stored include cloth
The length that the cloth image of pattern is matched, and moved on a moving belt in conjunction with the cloth is determined at described first group
The corresponding practical cloth pattern image of the first image acquisition device acquired image during light source rotates 180 °;
(3304) first cloth reference picture and the last one cloth reference picture are based on pre-stored including cloth
The cloth image of pattern carry out it is matched as a result, obtain it is collected from the first image acquisition device, remove first
Cloth reference picture practical cloth corresponding with other each cloth reference pictures except the last one cloth reference picture
Pattern image;
(3305) collected from the first image acquisition device, first cloth reference picture of removing and the last one cloth
In other cloth reference pictures except reference picture, the corresponding practical cloth pattern figure of these cloth reference pictures is removed
Picture obtains multiple label shadow images;
(3306) it is irradiated based on label each in first label shadow image in chronological order in one group of light source
The shade of lower generation determines the neighborhood of the predefined size around each shade region;
(3307) based on the shade for marking each label determined in shadow image to generate under one group of light source irradiation at one
The neighborhood of predefined size around region calculates in multiple label shadow images remaining each label shadow image at this
The sum of shaded area in neighborhood, by this and as the first reference value of label;
(3308) determine second image collecting device collected first during second group of light source rotates 180 °
Cloth reference picture and the last one cloth reference picture;
(3309) according to the time and second cloth of conveyer belt transmission speed and the acquisition of the last one described cloth reference picture
Time difference between the time of reference picture acquisition obtains cloth and is transmitting during second image acquisition device
Take mobile length;
(3310) according to first cloth reference picture and the last one cloth reference picture and it is pre-stored include cloth
The length that the cloth image of pattern is matched, and moved on a moving belt in conjunction with the cloth is determined at described second group
The light source corresponding practical cloth pattern image of image that second image acquisition device arrives during rotating 180 °;
(3311) first cloth reference picture and the last one cloth reference picture are based on pre-stored including cloth
The cloth image of pattern carry out it is matched as a result, obtain from second image acquisition device to, remove first
Cloth reference picture practical cloth corresponding with other each cloth reference pictures except the last one cloth reference picture
Pattern image;
(3312) from second image acquisition device to, remove first cloth reference picture and the last one cloth
In other cloth reference pictures except reference picture, the corresponding practical cloth pattern figure of these cloth reference pictures is removed
Picture obtains multiple label shadow images;
(3313) it is irradiated based on label each in second label shadow image in chronological order in second group of light source
The shade of lower generation determines the neighborhood of the predefined size around each shade region;
(3314) based on the shade for marking each label determined in shadow image to generate in the case where second group of light source irradiates at one
The neighborhood of predefined size around region calculates in multiple label shadow images remaining each label shadow image at this
The sum of shaded area in neighborhood, by this and as the second reference value of label;
(3315) it when the absolute value of the difference of first reference value of label and the second reference value of label is more than preset threshold, indicates
Cloth pattern is inconsistent.
5. according to the method described in claim 4, it is characterized in that, the one group of light source and second group of light source are transmitting
The height taken apart from plane where cloth is not identical.
6. according to the method described in claim 5, it is characterized in that, the one group of light source and second group of light source are vertical
In higher than the height of fault to be detected on the direction of the transmission tape travel.
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