Methods and apparatuses for addressing chromatic abberations and purple fringing
First Claim
1. A processor-implemented method of correcting lateral chromatic aberrations in digital images within a digital image acquisition device, comprising:
- calibrating a camera-lens pair;
acquiring a digital image;
correcting lateral chromatic aberrations within the digital image, including;
finding a displacement for a current pixel in a temporary buffer;
designating the displacement as a relative position in a source buffer;
interpolating a displacement value, comprising;
estimating a mean distance between data points,organizing the data points into a rectangular array, andestimating said displacement value by inverse distance weighting;
storing interpolated displacement value in the temporary buffer; and
repeating for next one or more pixels and end after last pixel; and
outputting, storing, displaying, projecting, or transmitting a corrected digital image which has been corrected for lateral chromatic aberrations in two dimensions, or a further processed version of the digital image, or combinations thereof.
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Abstract
Methods and systems for detecting and correcting chromatic aberration and purple fringing are disclosed. Chromatic aberration can be addressed by separating an image into color planes and then adjusting these to reduce chromatic aberration by using a specific calibration image (calibration chart) as an empirical method to calibrate the image acquisition device. Purple fringing can be corrected by initially addressing color aberration resulting from the lateral chromatic aberration (LCA). The LCA is first removed and then the correction is extended to purple fringing. A discovery is relied upon that the purple fringing is created in the direction of the chromatic aberration and is more pronounced in the direction of the chromatic aberration.
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Citations
30 Claims
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1. A processor-implemented method of correcting lateral chromatic aberrations in digital images within a digital image acquisition device, comprising:
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calibrating a camera-lens pair; acquiring a digital image; correcting lateral chromatic aberrations within the digital image, including; finding a displacement for a current pixel in a temporary buffer; designating the displacement as a relative position in a source buffer; interpolating a displacement value, comprising; estimating a mean distance between data points, organizing the data points into a rectangular array, and estimating said displacement value by inverse distance weighting; storing interpolated displacement value in the temporary buffer; and repeating for next one or more pixels and end after last pixel; and outputting, storing, displaying, projecting, or transmitting a corrected digital image which has been corrected for lateral chromatic aberrations in two dimensions, or a further processed version of the digital image, or combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. One or more non-transitory processor readable media having code embedded therein for programming a processor to perform a method of correcting lateral chromatic aberrations in digital images, wherein the method comprises:
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calibrating a camera-lens pair; acquiring a digital image; correcting lateral chromatic aberrations within the digital image, including; finding a displacement for a current pixel in a temporary buffer; designating the displacement as a relative position in a source buffer; interpolating a displacement value, comprising; estimating a mean distance between data points, organizing the data points into a rectangular array, and estimating said displacement value by inverse distance weighting; store interpolated displacement value in the temporary buffer; and repeat for next one or more pixels and end after last pixel. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A portable digital image acquisition device comprising a lens, an image sensor, a processor, and one or more processor readable media having code embedded therein for programming the processor to perform a method of correcting lateral chromatic aberrations in digital images, wherein the method comprises:
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calibrating a camera-lens pair; acquiring a digital image; correcting lateral chromatic aberrations within the digital image, including; finding a displacement for a current pixel in a temporary buffer; designating the displacement as a relative position in a source buffer; interpolating a displacement value, comprising; estimating a mean distance between data points, organizing the data points into a rectangular array, and estimating said displacement value by inverse distance weighting; storing interpolated displacement value in the temporary buffer; and repeating for next one or more pixels and end after last pixel; and outputting, storing, displaying, projecting, or transmitting a corrected digital image which has been corrected for lateral chromatic aberrations, or a further processed version of the digital image, or combinations thereof. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification