Use of frequency transforms in the analysis of image sensors
AssigneeEastman Kodak Company
InventorsGreg Archer, Eric Meisenzahl, David Nichols, Shen Wang
Life of this patent
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Abstract
A method for detecting and removing noise from an image, the method includes the steps of applying a frequency transform to the image for obtaining a magnitude image; applying a threshold value to values of the magnitude image for obtaining threshold values; setting one or more threshold values to a predetermined value; and reconstructing the image from the magnitude image having the predetermined values for removing noise from the image.
Claims30
A method for detecting and removing noise from an image, the method comprising the steps of:
- (a) applying a frequency transform to the image for obtaining a magnitude image;
- (b) comparing a threshold value to values of the magnitude image for obtaining thresholded values;
- (c) setting one or more thresholded values to a predetermined value;
- and
- (d) reconstructing the image from the magnitude image having the predetermined values for removing noise from the image.
A computer program product comprising computer storage medium having a program stored thereon for performing the steps of:
- (a) applying a frequency transform to the image for obtaining a magnitude image;
- (b) comparing a threshold value to values of the magnitude image for obtaining thresholded values;
- (c) setting one or more thresholded values to a predetermined value;
- and
- (d) reconstructing the image from the magnitude image having the predetermined values for removing noise from the image.
A camera for detecting and removing noise from an image, the camera comprising:
- (a) a frequency transform applied to the image for obtaining a magnitude image;
- (b) a threshold value compared to values of the magnitude image for obtaining thresholded values;
- and
- (c) a predetermined value to which the thresholded value is set;
- and wherein the image is reconstructed from the magnitude image having the predetermined values for removing noise from the image.
A method for determining the quality of an image sensor, the method comprising the steps of:
- (a) applying a frequency transform to the image for obtaining a magnitude image;
- (b) comparing a threshold value to values of the magnitude image for obtaining thresholded values;
- and
- (c) determining if image quality is acceptable based on the thresholded values.
Dependencies are inferred from the claim text.