Spatial filter for enhancing Hartmann-Shack images and associated methods
AssigneeAlcon Inc.
InventorJohn Alfred Campin
Life of this patent
Estimating the term…
Abstract
A system and method improve a quality of sensor image data from a wavefront emanating from an eye. The sensor image data include a pixel array of intensities. A filter array is populated with a coefficient at each position of the array and the filter array is applied to each position in the pixel array. The system includes a process and a software package adapted to perform the above method steps.
Claims34
A method for improving a quality of sensor image data, the method comprising the steps of:
- receiving sensor image data, the sensor image data comprising a pixel array of intensities being derived from a wavefront emanating from an eye;
- populating a filter array with a coefficient at each position of the array;
- the coefficient at each position of the array being selected to highlight a wavefront portion profile within the image data;
- and
- applying the filter to each position in the pixel array in order to detect the wavefront portion profiles within the image data.
A wavefront analyzer for improving a quality of sensor image data, the wavefront analyzer comprising:
- means for receiving the sensor image data, the sensor image data comprising a pixel array of intensities being derived from a wavefront emanating from an eye;
- means for populating a filter array with a coefficient at each position of the array;
- the populating means selecting the coefficient at each position of the array to highlight wavefront portion profiles within the image data;
- and
- means for applying the filter array to each position in the pixel array in order to detect the wavefront portion profiles within the image data.
A method for determining aberrations of an eye, comprising the steps of:
- directing an optical beam onto a retina of an eye;
- reflecting the optical beam from the retina;
- sensing a wavefront in a reflected optical beam;
- recording the sensed wavefront as a pixel array;
- applying a spatial filter to the pixel array to create filtered image data having improved quality in order to detect wavefront portion profiles within the image data;
- and
- determining aberrations of the eye based upon the filtered image data.
A system for determining aberrations of an eye comprising:
- means for directing an optical beam onto a retina of an eye;
- means for sensing a wavefront from an optical beam reflected from the retina;
- means for recording the sensed wavefront as a pixel array;
- means for applying a spatial filter to the pixel array to create a filtered image having improved quality in order to detect wavefront portion profiles within the image data;
- and
- means for determining aberrations of the eye based upon the filtered image data.
Dependencies are inferred from the claim text.