EP0055965A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process and device for the binarization of a pattern
Assignee: Image Processing Technologies Inc
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Filing: 1981-12-28
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Granted: —
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Expires: 2001-12-28
Abstract
Abstract A device for the binarized evaluation of a pattern from a signal indicative of intensity values of spatially distributed discrete points of said pattern, characterized in that it comprises : means (1,2,3) for registering the intensity values of points distributed in at least two concentric rings within said area, at least in one sector centered on said elementary area, determining contrast values each equal to the difference of the registered intensity values between a point of an inner ring and a point of an outer ring, and assigning a positive and negative difference sign to respectively the positive and negative contrast values thus determined having an absolute value higher than a predetermined contrast threshold, means (4,5,6) for counting distinctively said positive and negative difference signs in the vicinity of said elementary area, and means (7) for assigning a light or dark quality to said area respectively when said counted difference signs contain a predominant number of positive or negative difference signs by more than a predetermined minimum.
Inventors
- 👤 Morton Nadler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 13:50
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/20; G06V10/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
1°) A process for binarization of a signal indicative of intensity values of spatially distributed discrete points of a pattern wherein each of successively scanned elementary areas is evaluated as being of dark or bright quality depending on the intensity values of a number of points around said elementary area, wherein said process comprises, for each said elementary area : registering the intensity values of points distributed in at least two concentric rings within at least one sector centered on said elementary area, determining a number of contrast values each equal to the difference of registered intensity values between a point of an inner ring and a point of an outer ring, assigning a positive and negative difference sign to respectively the positive and negative contrast values showing an absolute value higher than a predetermined contrast threshold, counting separately said positive and negative difference signs, and assigning a light or dark quality to said area respectively when said counted signs contain a predominant number of positive or negative signs by more than a predetermined minimum.
Claim 2
Dependent Claim
175 words
1°) A process for binarization of a signal indicative of intensity values of spatially distributed discrete points of a pattern wherein each of successively scanned elementary areas is evaluated as being of dark or bright quality depending on the intensity values of a number of points around said elementary area, wherein said process comprises, for each said elementary area : registering the intensity values of points distributed in at least two concentric rings within at least one sector centered on said elementary area, determining a number of contrast values each equal to the difference of registered intensity values between a point of an inner ring and a point of an outer ring, assigning a positive and negative difference sign to respectively the positive and negative contrast values showing an absolute value higher than a predetermined contrast threshold, counting separately said positive and negative difference signs, and assigning a light or dark quality to said area respectively when said counted signs contain a predominant number of positive or negative signs by more than a predetermined minimum.
Claim 3
Dependent Claim
44 words
2°) A process according to claim 1, wherein each point is involved in the calculation of contrast values by difference with points of an inner ring or outer ring a number of times selected in accordance with the.contrast laplacean operator for said elementary area.
Claim 4
Dependent Claim
49 words
3°) A process according to claim 1, wherein it comprises registering the positive and negative difference signs counted for said sector and using the registered signs as an indication of the positive and negative difference signs in a similar or symmetrical sector centered on another later scanned elementary area.
Claim 5
Dependent Claim
87 words
4°) A process according to claim 3 characterized in that it comprises determining the difference in number between said counted registered positive difference signs and said counted registered negative difference signs for all sectors around said elementary area, comparing said difference in number to said minimum and assigning the light or dark quality only if said difference in number is higher than said minimum, the quality being light or dark when the number of positive signs is respectively higher or lower than the number of negative signs.
Claim 6
Dependent Claim
31 words
5°) A device for the binarized evaluation of a pattern from a signal indicative of intensity values of spatially distributed discrete points of said pattern, characterized in that it comprises :
Claim 7
Dependent Claim
31 words
5°) A device for the binarized evaluation of a pattern from a signal indicative of intensity values of spatially distributed discrete points of said pattern, characterized in that it comprises :
Claim 8
Dependent Claim
84 words
means (1,2,3) for registering the intensity values of points distributed in at least two concentric rings within said area, at least in one sector centered on said elementary area, determining contrast values each equal to the difference of the registered intensity values between a point of an inner ring and a point of an outer ring, and assigning a positive and negative difference sign to respectively the positive and negative contrast values thus determined having an absolute value higher than a predetermined contrast threshold,
Claim 9
Dependent Claim
84 words
means (1,2,3) for registering the intensity values of points distributed in at least two concentric rings within said area, at least in one sector centered on said elementary area, determining contrast values each equal to the difference of the registered intensity values between a point of an inner ring and a point of an outer ring, and assigning a positive and negative difference sign to respectively the positive and negative contrast values thus determined having an absolute value higher than a predetermined contrast threshold,
Claim 10
Dependent Claim
53 words
means (4,5,6) for counting distinctively said positive and negative difference signs in the vicinity of said elementary area and means (7) for assigning a light or dark quality to said area respective.ly when said counted difference signs contain a predominant number of positive or negative difference signs by more than a predetermined minimum.
Claim 11
Dependent Claim
53 words
means (4,5,6) for counting distinctively said positive and negative difference signs in the vicinity of said elementary area and means (7) for assigning a light or dark quality to said area respective.ly when said counted difference signs contain a predominant number of positive or negative difference signs by more than a predetermined minimum.
References Cited (Backward Citations)
No citation records indexed.
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