Positional measurement of a feature within an image
First Claim
Patent Images
1. A method for determining coordinates of a feature comprising:
- providing a first image including the feature, the first image comprising a plurality of pixels;
determining a first estimate of coordinates of the feature to within a fraction of a pixel;
translating the feature relative to the pixels by a pixel translation value, wherein the sum of the pixel fraction and pixel translation value is an integer value;
determining a second estimate of coordinates of the translated feature to within a fraction of a pixel; and
summing the pixel fractions of the first estimate with the second estimate to derive a refined estimate of coordinates.
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Abstract
The position of a feature within an image is determined by determining an initial estimate of the feature position to within a fraction of a pixel, translating the feature by an amount equal to that fraction of a pixel, determining a further estimate of the translated feature position to within a fraction of a pixel and summing the pixel fraction of the previous estimate with the further estimate of the position to arrive at a refined estimate of the feature position.
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Citations
20 Claims
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1. A method for determining coordinates of a feature comprising:
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providing a first image including the feature, the first image comprising a plurality of pixels; determining a first estimate of coordinates of the feature to within a fraction of a pixel; translating the feature relative to the pixels by a pixel translation value, wherein the sum of the pixel fraction and pixel translation value is an integer value; determining a second estimate of coordinates of the translated feature to within a fraction of a pixel; and summing the pixel fractions of the first estimate with the second estimate to derive a refined estimate of coordinates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 17, 18, 19)
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11. A method for determining coordinates of an object, the method comprising the steps of:
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capturing at least one first image and at least one second image of the object, each image being captured having different coordinates with respect to the other; determining the position of the object within each image, wherein determining includes; providing the first image including a feature, the first image comprising a plurality of pixels; determining a first estimate of coordinates of the feature to within a fraction of a pixel; translating the feature relative to the pixels by a pixel translation value, wherein the sum of the pixel fraction and pixel translation value is an integer value; determining a second estimate of coordinates of the translated feature to within a fraction of a pixel; summing the pixel fractions of the first estimate with the second estimate to derive a refined estimate of coordinates; and comparing the determined positions of the object to determine dimensional changes. - View Dependent Claims (13, 14, 20)
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Specification