Patent US3914742A successfully refreshed from Google Patents.
US3914742A
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Apparatus for use in optical reading machines for transforming a two-dimensional line pattern into opto-electronically detectable images
Assignee: Instituttet for Produktudvikling PS
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Filing: 1974-06-19
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Granted: 1975-10-21
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Expires: 1994-06-19
Abstract
Abstract An apparatus for use in an optical reading machine for twodimensional line patterns for the optical transformation of such a line pattern in a number of spaced channels into optoelectronically detectable images each of which is correlated with the original line pattern and extracts a certain line orientation therefrom by means of an optical filter in each channel having uni-directional power of resolution and one-dimensional redundance, said optical filters being arranged with different directions of resolution in the individual channels, the image plane of each channel being raster sub-divided into elementary areas each of which is subjected to an opto-electronical detection of the presence of line segments or tangential inclinations having a direction corresponding to the resolution of the same channel.
Inventors
- 👤 Ebbe Munster
- 👤 Per Ponsaing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:37
CPC Classifications
B; B07; B07C; B07C3/00; B07C3/10; B07C3/14; G; G06; G06V; G06V10/00; G06V10/88
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
242 words
An apparatus for use in an optical pattern recognition system for the optical input transformation of a two-dimensional line pattern in a number of separated channels into optoelectronically detectable images, the images in each of said channels being correlated with said pattern and extracting a particular line orientation therein, said channel images forming together the optical input information for a subsequent classification of said pattern into one of a given number of pattern classes, said apparatus comprising a common object plane for all said channels; means at said object plane for positioning said line pattern; optical transformation means in each of said channels constituted by optical filters having unidirectional power of resolution and one-dimensional redundance, said optical filters being arranged in different ones of said channels with mutually differing directions of resolution; an image plane in each of said channels; means for subdividing the image of said pattern formed in each of said image planes in two mutually orthogonal directions into a raster of elementary areas each comprising a portion only of the entire pattern image; and photosensitive means arranged at each of said image planes for selectively detecting the optical input information from each elementary area simultaneously in all said channels, said input information being constituted by the luminous intensity received by said photo sensitive means, said photo sensitive means being adjusted to supply an electric output signal in response to the magnitude of said luminous intensity relative to a threshold.
Claim 2
Independent Claim
242 words
An apparatus for use in an optical pattern recognition system for the optical input transformation of a two-dimensional line pattern in a number of separated channels into optoelectronically detectable images, the images in each of said channels being correlated with said pattern and extracting a particular line orientation therein, said channel images forming together the optical input information for a subsequent classification of said pattern into one of a given number of pattern classes, said apparatus comprising a common object plane for all said channels; means at said object plane for positioning said line pattern; optical transformation means in each of said channels constituted by optical filters having unidirectional power of resolution and one-dimensional redundance, said optical filters being arranged in different ones of said channels with mutually differing directions of resolution; an image plane in each of said channels; means for subdividing the image of said pattern formed in each of said image planes in two mutually orthogonal directions into a raster of elementary areas each comprising a portion only of the entire pattern image; and photosensitive means arranged at each of said image planes for selectively detecting the optical input information from each elementary area simultaneously in all said channels, said input information being constituted by the luminous intensity received by said photo sensitive means, said photo sensitive means being adjusted to supply an electric output signal in response to the magnitude of said luminous intensity relative to a threshold.
Claim 3
Dependent Claim
25 words
An apparatus as claimed in claim 1, wherein each of said optical filters comprises the combination of a convex spherical lens and a cylindrical lens.
Claim 4
Dependent Claim
43 words
An apparatus as claimed in claim 2, wherein the convex spherical lenses of the optical filter incorporated in at least two of said channels are formed by a sector lens having a number of spatial separated lenses corresponding to the number of channels.
Claim 5
Dependent Claim
46 words
An apparatus as claimed in claim 2, wherein the cylindrical lenses of the optical filters for all of said channels have equal powers of magnification, the cylindrical lens in each channel having a generatrix orientation different from that of the cylindrical lens in any other channel.
Claim 6
Dependent Claim
57 words
An apparatus as claimed in claim 2, wherein said channels are arranged in channel pairs each comprising two channels, the cylindrical lenses in said two channels of the same channel pair having mutually different powers of magnification and the same generatrix orientation, said generatrix orientation differing from that of the cylindrical lenses in any other channel pair.
References Cited (Backward Citations)
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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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |