Dot region discriminating method
First Claim
1. A dot region discriminating method for discriminating a dot region of an image which is described by a digital multilevel input image signal, said dot region discriminating method comprising:
- (a) an extreme point detecting step for detecting one or a plurality of extreme points from a first local region within the image, each of said extreme points corresponding to a peak or a valley of a density change of a picture element within said first local region, said first local region corresponding to a matrix which comprises M×
M picture elements;
(b) a dot region detecting step for detecting whether or not(1) one of a center picture element within one of said second local regions of the image or(2) one of said second local regions, belongs to a dot region;
wherein the dot region detecting step is based on a distribution of the extreme points detected within said first local region by said extreme point detecting step, and wherein each of said second local regions corresponds to a block which comprises N×
N picture elements; and
(c) a discriminating step for discriminating the dot region of the image based on the detection made by said dot region detecting step.
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Abstract
A dot region discriminating method discriminates a dot region of an image which is described by a digital input image signal. The method includes detecting one or more extreme points from a first local region within the image. Each of the extreme points corresponds to a peak or valley of a density change of a picture element within the first local region. The method further comprises detecting whether or not one of (1) a center picture element within one of said local regions of the image or (2) one of the second local regions, belongs to a dot region, this second detecting step being based on a distribution of the extreme points detected in the first local region by the first detecting step. Finally, the method involves discriminating the dot region of the image based on the second detection step.
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Citations
70 Claims
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1. A dot region discriminating method for discriminating a dot region of an image which is described by a digital multilevel input image signal, said dot region discriminating method comprising:
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(a) an extreme point detecting step for detecting one or a plurality of extreme points from a first local region within the image, each of said extreme points corresponding to a peak or a valley of a density change of a picture element within said first local region, said first local region corresponding to a matrix which comprises M×
M picture elements;(b) a dot region detecting step for detecting whether or not (1) one of a center picture element within one of said second local regions of the image or (2) one of said second local regions, belongs to a dot region; wherein the dot region detecting step is based on a distribution of the extreme points detected within said first local region by said extreme point detecting step, and wherein each of said second local regions corresponds to a block which comprises N×
N picture elements; and(c) a discriminating step for discriminating the dot region of the image based on the detection made by said dot region detecting step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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Specification