Aberrometer having reduced noise
OwnerLloyd G. Allred, Barry T. Eaganinventors
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for facilitating determination of centroids of image spots in an image containing an array of image spots generated by an aberrometer, the image comprising a first plurality of pixels each pixel having a corresponding intensity value, the method comprising calculating an average intensity value for a second plurality of pixels in a perimeter around a pixel, the average calculated using a subset of the second plurality exclusive of at least a portion of the pixels in the perimeter.
Claims21
A method for facilitating determination of centroids of image spots in an image containing an array of image spots generated by an aberrometer, the image comprising a first plurality of pixels each pixel having a corresponding intensity value, the method comprising:
- calculating an average intensity value for a second plurality of pixels in a perimeter around a first pixel, the average calculated using a subset of the second plurality exclusive of at least a plurality of the pixels in the perimeter.
An aberrometer comprising:
- a light source configured and arranged to project light onto a subject's eye;
- a lenslet array configured and arranged to receive the light after it reflected form a retina of the eye;
- a sensor adapted to receive an image containing an array of image spots from lenslet array, the sensor comprising a first plurality of pixels each pixel having a corresponding intensity value;
- a processor coupled to the sensor adapted to calculate an average intensity value for a second plurality of pixels in a perimeter around a first pixel of said first plurality of pixels, the average calculated using a subset of the second plurality exclusive of at least a plurality of the pixels in the perimeter.
Dependencies are inferred from the claim text.