Geometric parameter measurement of an imaging device
First Claim
1. A method of determining three-dimensional (3D) geometric parameters of an imaging device, the method comprising the steps of:
- (a) providing a two-dimensional (2D) target image comprising a plurality of alignment patterns;
(b) imaging said target image with an imaging device to form a captured image;
(c) comparing at least one said pattern of said captured image with a corresponding pattern of said target image; and
(d) determining from said comparison said geometric parameters of the imaging device,wherein the geometric parameters comprise at least one geometric parameter describing a geometric lens distortion transformation between said target image and said captured image and at least one geometric parameter describing a perspective transformation between said target image and said captured image,wherein the geometric parameter describing the perspective transformation is determined based on said geometric parameter describing the geometric lens distortion transformation.
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Abstract
Disclosed is a method of determining at least one three-dimensional (3D) geometric parameter of an imaging device. A two-dimensional (2D) target image is provided having a plurality of alignment patterns. The target image is imaged with an imaging device to form a captured image. At least one pattern of the captured image is compared with a corresponding pattern of the target image. From the comparison, the geometric parameter of the imaging device is then determined. The alignment patterns include at least one of (i) one or more patterns comprising a 2D scale and rotation invariant basis function, (ii) one or more patterns comprising a 1D scale invariant basis function, and (iii) one or more patterns having a plurality of grey levels and comprising a plurality of superimposed sinusoidal patterns, the plurality of sinusoidal patterns having a plurality of predetermined discrete orientations. Also disclosed is a two-dimensional test chart for use in testing an imaging device, the test chart comprising a plurality of alignment patterns, at least one of said alignment patterns including one of those patterns mentioned above.
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Citations
24 Claims
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1. A method of determining three-dimensional (3D) geometric parameters of an imaging device, the method comprising the steps of:
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(a) providing a two-dimensional (2D) target image comprising a plurality of alignment patterns; (b) imaging said target image with an imaging device to form a captured image; (c) comparing at least one said pattern of said captured image with a corresponding pattern of said target image; and (d) determining from said comparison said geometric parameters of the imaging device, wherein the geometric parameters comprise at least one geometric parameter describing a geometric lens distortion transformation between said target image and said captured image and at least one geometric parameter describing a perspective transformation between said target image and said captured image, wherein the geometric parameter describing the perspective transformation is determined based on said geometric parameter describing the geometric lens distortion transformation. - 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)
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Specification