Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-06-26
1989-05-30
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358101, 382 18, H04N 718
Patent
active
048356050
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method for determining a geometrical parameter for a mixture of crimped, curly or crinkled, irregularly structured fibres of different length and width, such as textile fibres and tobacco fibres with the features of the preamble of claim 1.
PRIOR ART
The average fibre length is a geometrical quantity for straight fibres having a uniform thickness, but a different length. This can be determined in such a way that a quantity of fibres is separated or singled out on a defined surface of a substrate, an image of the separated fibres is produced by means of a camera, the length of the individual fibres is measured from the image, the lengths of the individual fibres are summated and the sum is divided by the number of fibres. The thus obtained geometrical parameter is the average fibre length (cf. e.g. "Messen+Prufen, Automatik", October 1983, pp 546 to 556). All these methods are carried out with one image per measurement.
In the case of crimped fibres with a uniform fibre diameter, such as textile fibres and crimped fibres with different fibre width and branches of the individual fibres, such as e.g. tobacco fibres, the average fibre length is not a suitable geometrical parameter for characterizing a fibre mixture, because an average fibre length cannot be determined and because branches, different fibre widths along a single fibre and fibre crimping are not taken into consideration.
DESCRIPTION OF THE INVENTION
The problem of the present invention is therefore to provide a method according to the preamble of claim 1 making it possible to determine a geometrical parameter for crimped, irregularly structured fibres in a fibre mixture with a large number of fibres, which is able to characterize fibres with an irregular fibre structure in crimping, length, width and diameter.
According to the invention this problem is solved by the method stages given in the characterizing part of claim 1. Further developments of the invention are described in subclaim 2.
The advantages of the invention are in particular that by producing two images and subsequent raster or grid formation and the displacement of said grids or rasters with respect to one another, it is possible to form a parameter for characterizing a fibre mixture making it possible to evaluate and classify said fibre mixture according to its characteristics, which are of decisive importance e.g. for the quality control of the fibre mixture.
SHORT DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail hereinafter relative to the drawings, wherein show:
FIG. 1, A picture of a separated quantity of fibres.
FIG. 2, A picture of a separated quantity of fibres with a superimposed transparent identical image, which is displace by one grid step (approximately 1 mm) (+x) direction.
FIG. 2a, A larger scale, diagrammatic representation of the displacement in the (x) or (+y) or (x/.+-.y) direction by in each case grid step x.sub.o, y.sub.o --description of the coordinate system, details of the grid steps .DELTA.x.sub.o, .DELTA.y.sub.o.
FIG. 2b, A master or reference image in the starting position--hatched surface: surface F to be determined.
FIG. 2c, A master or reference image and displaced image; displacement by .DELTA.x.sub.o in the +x direction--hatched surface: surface to be determined on displacement by one unit (.DELTA.x.sub.o) in the +x direction.
FIG. 2d, The master image and displaced image; displacement by .DELTA.y.sub.o in the +y direction--hatched surface: surface to be determined on displacing by one unit (.DELTA.y.sub.o) in the +y direction.
FIG. 2e, Master image and displaced image; displacement by .DELTA.y.sub.o in the +y direction and by .DELTA.x.sub.o in the +x direction--hatched surface: surface to be determined.
FIG. 2f, Master image and displaced image; displacement by .DELTA.y.sub.o in the -y direction and by .DELTA.x.sub.o in the +x direction--hatched surface: surface to be determined.
FIGS. 3a and 3b are respectively, a perspective view of the equipment for practicing the invent
REFERENCES:
patent: 3968475 (1976-07-01), McMahon
patent: 4460921 (1984-07-01), Henry et al.
patent: 4547800 (1985-10-01), Masaki
patent: 4636849 (1987-01-01), Wada et al.
Federle Hartmut
Melchior Klaus
Rueff Manfred
B.A.T. Cigarettenfabriken GmbH
FHG
Groody James J.
Kostak Victor R.
Siegemund Ralf H.
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