Edge detection technique having improved feature visibility
First Claim
1. A method for determining edge features of an image comprising:
- (a) filtering at least a portion of said image to attenuate high frequency signals of said image to an extent greater than low frequency signals of said image;
(b) performing a one-dimensional search in a first horizontal direction relative to a particular pixel of said image to determine a first horizontal direction local maximum;
(c) performing a one-dimensional search in a second horizontal direction relative to said particular pixel of said image to determine a second horizontal direction local maximum;
(d) calculating a horizontal gradient based upon said first horizontal direction local maximum and said second horizontal direction local maximum;
(e) performing a one-dimensional search in a first vertical direction relative to a particular pixel of said image to determine a first vertical direction local maximum;
(f) performing a one-dimensional search in a second vertical direction relative to said particular pixel of said image to determine a second vertical direction local maximum;
(g) calculating a vertical gradient based upon said first vertical direction local maximum and said second vertical direction local maximum;
(h) calculating a gradient for said particular pixel based upon said horizontal gradient and said vertical gradient.
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Accused Products
Abstract
A method for determining edge features of an image comprising filtering at least a portion of the image to attenuate high frequency signals of the image to an extent greater than low frequency signals of the image. Performing a one-dimensional search in a two different horizontal directions relative to a particular pixel of the image to determine horizontal direction local maximums. Calculating a horizontal gradient based upon the horizontal direction local maximums. Performing a one-dimensional search in a two vertical horizontal directions relative to a particular pixel of the image to determine vertical direction local maximums. Calculating a vertical gradient based upon the vertical direction local maximums. Calculating a gradient for the particular pixel based upon the horizontal gradient and the vertical gradient.
53 Citations
10 Claims
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1. A method for determining edge features of an image comprising:
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(a) filtering at least a portion of said image to attenuate high frequency signals of said image to an extent greater than low frequency signals of said image; (b) performing a one-dimensional search in a first horizontal direction relative to a particular pixel of said image to determine a first horizontal direction local maximum; (c) performing a one-dimensional search in a second horizontal direction relative to said particular pixel of said image to determine a second horizontal direction local maximum; (d) calculating a horizontal gradient based upon said first horizontal direction local maximum and said second horizontal direction local maximum; (e) performing a one-dimensional search in a first vertical direction relative to a particular pixel of said image to determine a first vertical direction local maximum; (f) performing a one-dimensional search in a second vertical direction relative to said particular pixel of said image to determine a second vertical direction local maximum; (g) calculating a vertical gradient based upon said first vertical direction local maximum and said second vertical direction local maximum; (h) calculating a gradient for said particular pixel based upon said horizontal gradient and said vertical gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification