EP0173972A1
Expired / Lapsed
EP
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Pre-processing system for pre-processing an image signal succession prior to identification
Assignee: NEC Corp
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Filing: 1985-08-29
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Granted: —
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Expires: 2005-08-29
Abstract
Abstract @ In a pre-processing system (45) for pre-processing a succession of image signals which are extracted from an object on an input surface (33) and which are representative of a ridge pattern (39) of the object, a center position of the ridge pattern (39) is determined with reference to the image signal succession and is compared with a center zone of the input surface (33) so as to decide whether or not the center position is placed at the center zone. The center position can be decided by monitoring occurrence of runs along each scanning line and by detecting a maximum one of the numbers of runs. Alternatively, the center position may be decided by monitoring ridges extended in a preselected direction with respect to the scanning lines and by detecting a maximum one of the numbers of the ridges extended in the preselected direction. The pre-processing system (45) may detect whether the object is true or false by monitoring the image signal succession.
Inventors
- 👤 Koichiro Morita
- 👤 Ko Asai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 20:38
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/12; G06V40/1347; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/37
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
A pre-processing system for use in pre-processing a succession of image signals representative of a ridge pattern prior to identification of said ridge pattern, said ridge pattern being derived from an object placed on an input surface, said ridge pattern having a center pattern while said input surface has a center zone, wherein the improvement comprises: position deciding means responsive to said image signal succession for deciding a position of said center pattern with reference to said image signal succession to produce a position signal indicative of said position; and pattern detecting means responsive to said position signal for detecting whether or not said center pattern is placed at said center zone of the input surface to produce a detection signal representative of whether or not said identification is to be carried out.
Claim 2
Dependent Claim
133 words
A pre-processing system for use in pre-processing a succession of image signals representative of a ridge pattern prior to identification of said ridge pattern, said ridge pattern being derived from an object placed on an input surface, said ridge pattern having a center pattern while said input surface has a center zone, wherein the improvement comprises: position deciding means responsive to said image signal succession for deciding a position of said center pattern with reference to said image signal succession to produce a position signal indicative of said position; and pattern detecting means responsive to said position signal for detecting whether or not said center pattern is placed at said center zone of the input surface to produce a detection signal representative of whether or not said identification is to be carried out.
Claim 3
Dependent Claim
102 words
A pre-processing system as claimed in Claim 1, each of said image signals having a grey level classifiable into either one of a first level and a second level different from said first level, wherein said position deciding means comprises: run detecting means responsive to said image signal succession for detecting a succession of runs, each being specified by a preselected one of said first and said second levels; and (Claim 2 continued) monitoring means coupled to said run detecting means for monitoring a distribution of said runs to detect the position of said center pattern and to produce said position signal.
Claim 4
Dependent Claim
84 words
A pre-processing system as claimed in Claim 2, said image signal succession being divisible into a plurality of partial sequences appearing within a plurality of predetermined durations, respectively, wherein said monitoring means comprises: counting means for successively counting the numbers of the runs for the respective predetermined durations; comparing means for comparing the numbers of runs with one another to detect a maximum one of said numbers; and means for determining the position of said center pattern from said maximum one of said numbers.
Claim 5
Dependent Claim
44 words
A pre-processing system as claimed in Claim 3, wherein said pattern detecting means comprises: means for indicating a reference position indicative of said center zone; and means for comparing the position of said center position with said reference position to produce said detection signal.
Claim 6
Dependent Claim
94 words
A pre-processing system as claimed in any of claims 1 to 4, said ridge pattern having a plurality of ridges, wherein said position deciding means comprises: (Claim 5 continued) direction monitoring means responsive to said image signal succession for successively monitoring a part of said ridge pattern to partially detect directions of the ridges; and processing means coupled to said direction monitoring means for processing said directions of the ridges to detect a distribution of said directions of the ridges and to produce said position signal with reference to said distribution of the directions.
Claim 7
Dependent Claim
21 words
A pre-processing system as claimed in Claim 5, wherein said directions are determined by angles between scanning lines and the ridges.
Claim 8
Dependent Claim
30 words
A pre-processing system as claimed in Claim 6, wherein said position of the center pattern is dependent on the numbers of the ridges which are perpendicular to said scanning lines.
Claim 9
Dependent Claim
32 words
A pre-processing system as claimed in Claim 7, wherein said position of the center pattern is determined by a maximum one of the numbers of the ridges perpendicular to said scanning lines.
Claim 10
Dependent Claim
106 words
A pre-processing system for use in pre-processing a succession of image signals prior to identification of said image signal succession, said image signal succession being derived from either a true or a false object placed on an input surface, wherein the improvement comprises: (Claim 9 continued) discriminating means responsive to said image signal succession for discriminating between said true and said false objects to selectively produce a true and a false signal representative of said true and said false objects, respectively; and means responsive to said true and said false signals for indicating said identification only when said true signal is produced by said discriminating means.
Claim 11
Dependent Claim
82 words
A pre-processing system as claimed in Claim 9, further comprising: image input means for repeatedly illuminating said input surface to extract said image signal succession from said input surface; said discriminating means comprising: level detector means for detecting a grey level of said image signal succession while said input surface is not illuminated, to produce a grey level signal representative of said grey level detected; and means responsive to said grey level signal for selectively producing said true and said false signals.
Claim 12
Dependent Claim
88 words
A pre-processing system as claimed in Claim 9 or 10, further comprising: a prism of a rectangle in section defining said input surface, an incident surface, and an exit surface; an internal light source for emitting incident light towards said incident light; (Claim 11 continued) a first band-pass filter placed between said internal light source and said incident surface and having a first passband; and a second band-pass filter adjacent to said exit surface, said second band-pass filter having a second passband partially superposed on said first passband.
Claim 13
Dependent Claim
92 words
claims 9 to 12. A pre-processing system as claimed in any of / 11, said image signal succession being extracted from said input surface as a preceding image signal succession and as a succeeding image signal succession after said preceding image signal succession, wherein: said discriminating means comprises: variation detecting means for detecting whether or not variations are present between said preceding and said succeeding image signal successions; and means for producing said true and said false signals when said variations are detected and not detected by said variation detecting means, respectively.
References Cited (Backward Citations)
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