Patent FR2624176A1 successfully refreshed from Google Patents.
US4887155A
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US
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Method and arrangement for measuring and/or monitoring properties of yarns or ropes
Assignee: Individual
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Filing: 1987-12-04
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Granted: 1989-12-12
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Expires: 2007-12-04
Abstract
Abstract For measuring and/or monitoring properties of yarns or ropes with the aid of an image sensor a two-dimensional image of a portion of the yarn or rope is acquired and converted to electrical image signals. The image signals are digitized in image point manner and stored in an image signal memory at memory locations assigned to the image points. By a calculating unit the values of the properties to be detected are determined from the stored digital image signals. The properties which can be measured and/or monitored in this manner are in particular the diameter of the yarn or rope, the statistical values of projecting fibres, filaments or wires and the twist of the yarn or rope.
Inventors
- 👤 Robert Massen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:03
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8914; G01N21/8915; D; D01; D01G; D01G31/00; D01G31/006; D01H; D01H13/00; D01H13/32; D06; D06H; D06H3/00; D06H3/08; D07; D07B; D07B7/00; D07B7/02; D07B7/022; G01B; G01B11/00; G01B11/08; G01B11/10; G01B11/105; G01N21/95; G01N21/952; G01N33/00; G01N33/36; G01N33/365; G06; G06T; G06T7/00; G06T7/0002; G06T7/0004; G06T7/60; G06T7/62; G06T2207/00; G06T2207/30; G06T2207/30108; G06T2207/30124
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
160 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory for which each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining the number of twists per unit length or the length of a twist of the yarn or rope from the stored digital image signals using a calculating unit by determining the period of the structure of the yarn or rope in an evaluation direction which is parallel to the longitudinal direction of the yarn or rope.
Claim 2
Independent Claim
160 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory for which each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining the number of twists per unit length or the length of a twist of the yarn or rope from the stored digital image signals using a calculating unit by determining the period of the structure of the yarn or rope in an evaluation direction which is parallel to the longitudinal direction of the yarn or rope.
Claim 3
Dependent Claim
59 words
A method according to claim 1 wherein said determining step further comprises calculating using the calculating unit a unidimensional similarity function of stored digital image signals corresponding to image points of at least one image point row extending in the evaluation direction and determining the period o the structure of the yarn or rope from the unidimensional similarity function.
Claim 4
Dependent Claim
45 words
A method according to claim 2 wherein said determining step further comprises calculating the auto-correlation function as the unidimensional function, and determining the period of the structure of the yarn or rope from the distance between two or more consecutive maxima of the auto-correlation function.
Claim 5
Dependent Claim
75 words
A method according to claim 2 wherein said determining step further comprises calculating the difference function as the unidimensional function, the difference function representing the sums of the quantity differences of stored digital image signals corresponding to image points of at least one image point row extending in the evaluation direction, and determining the period of the structure of the yarn or rope from the distance between two or more minima of the difference function.
Claim 6
Dependent Claim
44 words
A method according to claim 2 wherein said determining step further comprises calculating a spectral transform of the two-dimensional image from the stored image signals and determining the period of the structure of the yarn or rope from the dominant maximum of the spectrum.
Claim 7
Independent Claim
127 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining the mean fibre angle of the individual fibres of the yarn or rope from the stored digital image signals using a calculating unit.
Claim 8
Independent Claim
127 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining the mean fibre angle of the individual fibres of the yarn or rope from the stored digital image signals using a calculating unit.
Claim 9
Dependent Claim
47 words
A method according to claim 6 wherein said determining step comprises calculating the cross-ecorrelation function of stored digital image signals which originate from two spaced-apart image point rows extending parallel to an evaluation direction and determining the mean fibre angle from the maximum of the cross-correlation function.
Claim 10
Dependent Claim
21 words
A method according to claim 6 wherein said determining step further comprises determining the mean fibre angle by a Hough transformation.
Claim 11
Dependent Claim
145 words
A method according to claim 8 further comprising the steps of: (e) binarizing the stored digital image signals so that the image points of the image of the yarn or rope, depending on their brightness values, become either white or black; (f) determining a plurality of straight lines each of which is common to a large number of white image points of a selected image fragment by a Hough transformation performed by the calculating unit with the binarized digital image signals; (g) determining the angle of inclination of each of the straight lines with respect to the longitudinal axis of the yarn or rope, wherein the angle of inclination corresponds to a probable fibre angle; and (h) forming a histogram of the frequency distribution of the angles of inclination of the straight lines and determining the mean fibre angle from the maximum of the histogram.
Claim 12
Dependent Claim
30 words
A method according to claim 9, wherein the digitally stored image is differentiated in several directions for emphasizing the edges before determining the mean fibre angle by a Hough transformation.
Claim 13
Dependent Claim
19 words
A methd according to claim 6 wherein said determining step comprises determining the mean fibre angle by vector rotation.
Claim 14
Dependent Claim
127 words
A method according to claim 11 further comprising the steps of: (e) binarizing the stored digital image signals so that the image points of the image of the yarn or rope, depending on their brightness values, become either white or black; (f) rotating a vector in predetermined angular steps through the image of the yarn or rope and for each angular position of the vector counting the white image points lying on the vector; (g) forming a histogram of the number of white image points obtained for each angular position of the vector; and (h) determining the mean fibre angle from the maximum of a sum histogram of the results obtained from a plurality of measurements carried out over the entire image of the yarn or rope.
Claim 15
Dependent Claim
29 words
A method according to claim 12 wherein the digitally stored image is differentiated in several directions for emphasizing the edges before determining the mean fibre angle by vector rotation.
Claim 16
Independent Claim
153 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining the diameter of the yarn or rope from the stored digital image signals using a calculating unit by counting the number of image points belonging to the image of the yarn or rope along one or more lines extending transversely of the longitudinal axis of the yarn or rope.
Claim 17
Independent Claim
153 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining the diameter of the yarn or rope from the stored digital image signals using a calculating unit by counting the number of image points belonging to the image of the yarn or rope along one or more lines extending transversely of the longitudinal axis of the yarn or rope.
Claim 18
Independent Claim
154 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking a two-dimension image of a portion of the yarn or rope by using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining the diameter of the yarn or rope from the stored digital image signals using a calculating unit by determining the ratio of the total number of image points belonging to the image of the yarn or rope to the total number of the image points of the two-dimensional image.
Claim 19
Independent Claim
154 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking a two-dimension image of a portion of the yarn or rope by using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining the diameter of the yarn or rope from the stored digital image signals using a calculating unit by determining the ratio of the total number of image points belonging to the image of the yarn or rope to the total number of the image points of the two-dimensional image.
Claim 20
Independent Claim
147 words
A method of measuring and/or monitoring properties of a yarn comprising the steps of: (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining statistical values of projecting filaments or wires from the stored digital image signals using a calculating unit by counting the image points belonging to the projecting filaments or wires in one or more test strips extending parallel to the image of the yarn or rope.
Claim 21
Independent Claim
147 words
A method of measuring and/or monitoring properties of a yarn comprising the steps of: (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored; and (d) determining statistical values of projecting filaments or wires from the stored digital image signals using a calculating unit by counting the image points belonging to the projecting filaments or wires in one or more test strips extending parallel to the image of the yarn or rope.
Claim 22
Dependent Claim
16 words
A method according to claim 16 wherein each test strip corresponds to an image point row.
Claim 23
Dependent Claim
17 words
A method according to claim 16 wherein each test strip corresponds to several adjacent image point rows.
Claim 24
Independent Claim
152 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking two or more two-dimensional images of a portion of the yarn or rope from different angles using image sensors which convert the images to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the images; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional images has a memory location at which the complete digital image signal of the respective image point can be stored; (d) determining the diameter of the yarn or rope from the stored digital image signals of each two-dimensional image using a calculating unit; and (e) determining the unroundness of the yarn or rope using the calculating unit by comparing the diameters obtained for the different two-dimensional images.
Claim 25
Independent Claim
152 words
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of: (a) taking two or more two-dimensional images of a portion of the yarn or rope from different angles using image sensors which convert the images to electrical image signals; (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the images; (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional images has a memory location at which the complete digital image signal of the respective image point can be stored; (d) determining the diameter of the yarn or rope from the stored digital image signals of each two-dimensional image using a calculating unit; and (e) determining the unroundness of the yarn or rope using the calculating unit by comparing the diameters obtained for the different two-dimensional images.
Claim 26
Dependent Claim
54 words
A method according to claim 19 wherein said determining the diameter step further comprises determining each diameter of the yarn or rope by counting the number of image points belonging to the image of the yarn or rope along one or more lines extending transversely of the longitudinal axis of the yarn or rope.
Claim 27
Dependent Claim
54 words
A method according to claim 19 wherein said determining the diameter step further comprises determining each diameter of the yarn or rope by determining the ratio of the total number of image points belonging to the image of the yarn or rope to the total number of the image points of the two-dimensional image.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |