Method and apparatus for determining optical quality
AssigneeVisteon Global Technologies, Inc.
InventorTheodore B. Ladewski
Life of this patent
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Abstract
A method of determining optical quality of a transparent product includes passing a first gray-scale pattern through the material; obtaining a first image of the first pattern with an image pickup device after the first pattern has passed through the material; and determining optical quality of the material based on data obtained from the first image. An apparatus for determining optical quality of such a material is also disclosed.
Claims25
A method of determining optical quality of a transparent product, the method comprising:
- passing a first gray-scale pattern through the product;
- obtaining a first image of the first pattern with an image pickup device after the first pattern has passed through the product;
- and
- determining apparent magnification for each of a plurality of points on the product based on data obtained from the first image.
A method of determining optical quality of a transparent product, the method comprising:
- projecting a sequence of phase-shifted sinusoidal gratings onto a reference plane;
- obtaining an image with an image pickup device of each of the gratings within the sequence as seen through the product;
- determining a phase for each of a plurality of pixels on the images, wherein each pixel corresponds to a particular point on the product;
- and
- determining optical quality at each of a plurality of points on the product based on the phase at the corresponding pixel.
A method of determining optical quality of a transparent product, the method comprising:
- positioning the product relative to an image generating device and an image pickup device such that light passing between the image generating device and the image pickup device passes through the product;
- generating a sawtooth grating with the image generating device;
- obtaining a first image of the sawtooth grating with the image pickup device, wherein the first image is influenced by the product;
- generating a uniformly white target with the image generating device;
- obtaining a second image of the uniformly white target with the image pickup device, wherein the second image is influenced by the product;
- generating a uniformly dark target with the image generating device;
- obtaining a third image of the uniformly dark target with the image pickup device, wherein the third image is influenced by the product;
- determining a phase for each of a plurality of pixels on the images, wherein each pixel corresponds to a particular point on the product;
- and
- determining an optical characteristic for each of a plurality of points on the product based on the phase at the corresponding pixel.
An apparatus for determining optical quality of a transparent product, the apparatus comprising:
- an image generating device for generating a gray-scale pattern;
- an image pickup device for obtaining an image of the gray-scale pattern after the pattern has passed through the product;
- and
- an image analyzing device in communication with the image pickup device, the image analyzing device including instructions for determining apparent magnification for each of a plurality of points on the product based on the image.
A method of determining optical quality of a transparent product, the method comprising:
- passing a sequence of phase-shifted periodic gray-scale patterns through the product;
- obtaining an image with an image pickup device of each pattern within the sequence after each pattern has passed through the product;
- determining a phase for each of a plurality of pixels on the images, wherein each pixel corresponds to a particular point on the product;
- and
- determining optical quality at each of a plurality of points on the product based on the phase at the corresponding pixel.
Dependencies are inferred from the claim text.