Correction of position dependent blur in a digital image
First Claim
Patent Images
1. A method for creating a boost map to correct for position dependent blur in an image, comprising the steps of:
- (a) providing an electronic camera having an imaging system to capture images;
(b) using the electronic camera to capture an image of a test pattern having multiple edges in a repeated pattern;
(c) measuring the MTF of the imaging system at the position of each edge of the test pattern image;
(d) determining a desired MTF of the imaging system;
(e) calculating a boost value for each edge position based on the corresponding measured MTF value of that position and the desired MTF value; and
(f) creating a boost map as a function of two or more of the calculated boost values, the boost map including a plurality of position dependent gain values to be applied to subsequent images captured by the electronic camera in order to correct for position dependent blur in the captured images, such that for each pixel of the captured image, the boost map includes a corresponding position dependent gain value.
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Abstract
Images are sharpened and corrected for position dependent blur by providing a sharpening function which is adapted to operate upon signals corresponding to a selected number of pixels, providing a plurality of values which are a function of the position dependent blur; and applying the plurality of values to the sharpening function to modify the sharpening function so that after the modified sharpening function is applied to the image, a sharpened image will be provided which has been corrected for the position dependent blur.
84 Citations
26 Claims
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1. A method for creating a boost map to correct for position dependent blur in an image, comprising the steps of:
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(a) providing an electronic camera having an imaging system to capture images;
(b) using the electronic camera to capture an image of a test pattern having multiple edges in a repeated pattern;
(c) measuring the MTF of the imaging system at the position of each edge of the test pattern image;
(d) determining a desired MTF of the imaging system;
(e) calculating a boost value for each edge position based on the corresponding measured MTF value of that position and the desired MTF value; and
(f) creating a boost map as a function of two or more of the calculated boost values, the boost map including a plurality of position dependent gain values to be applied to subsequent images captured by the electronic camera in order to correct for position dependent blur in the captured images, such that for each pixel of the captured image, the boost map includes a corresponding position dependent gain value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for providing an improved sharpened image from an image having position dependent blur, comprising the steps of:
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(a) providing an electronic camera having an imaging system to capture images;
(b) using the electronic camera to capture an image of a test pattern having multiple edges in a repeated pattern;
(c) measuring the MTF of the imaging system at the position of each edge of the test pattern image;
(d) determining a desired MTF of the imaging system;
(e) calculating a boost value for each edge position based on the corresponding measured MTF value of that position and the desired MTF value;
(f) creating a boost map as a function of two or more of the calculated boost values, the boost map including a plurality of position dependent gain values to be applied to subsequent images captured by the electronic camera in order to correct for position dependent blur in the captured images, such that for each pixel of the captured image, the boost map includes a corresponding position dependent gain value;
(g) providing a sharpening function which is adapted to operate upon the captured image; and
(h) applying the plurality of position dependent gain values in the boost map to the sharpening function to modify the sharpening function corresponding to different positions of the captured image, so that a sharpened image is provided which has been corrected for the position dependent blur. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. Imaging apparatus for capturing images on a light-sensitive medium and for processing the captured images to correct for position dependent blur, the imaging system comprising:
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(a) an imaging section for capturing an image on the light-sensitive medium and producing image data, the capturing means possessing one or more attributes that cause position dependent blur of the captured image;
(b) means for capturing at image of a test pattern having multiple edges in a repeating pattern, and including means for measuring the MTF of the imaging system at the position of each edge of the test pattern;
(c) means for determining a desired MTF of the imaging system;
(d) means for calculating a boost value for each edge position based on the corresponding measured MTF value of that position and the desired MTF value;
(e) means for creating a boost map as a function of two or more of the calculated boost values, the boost map including a plurality of position dependent gain values to be applied to subsequent images captured by the electronic camera in order to correct for position dependent blur in the captured images, such that for each pixel of the captured image, the boost map includes a corresponding position dependent gain value; and
(f) processing means including a sharpening function which is adapted to operate upon the captured image and means for applying the plurality of position dependent gain values in the boost map to the sharpening function to modify the sharpening function corresponding to different positions of the captured image, so that a sharpened image is provided which has been corrected for the position dependent blur. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification