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;
store interpolated value in the temporary buffer; and
repeat 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.
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Accused Products
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.
73 Citations
39 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; store interpolated value in the temporary buffer; and repeat 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 (2, 3, 4, 5, 6, 10)
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7. A processor-implemented method of correcting lateral chromatic aberrations in digital images within a digital image acquisition device, comprising:
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acquiring a digital image; calculating corrected values for red (R) and blue (B) color channels as follows; R′
=R+(G−
R)×
corR;
B′
=B+(G−
B)×
corB;
where corR and corB are selected correction ratios for the red and blue color channels, respectively; andoutputting, 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 (8, 9)
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11. A processor-implemented method of correcting lateral chromatic aberrations in digital images within a digital image acquisition device, comprising:
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acquiring a digital image; calculating vertical and horizontal gradients for each color component; calculating correction ratios based on a dot product between color component gradient and vector formed by a pixel position and image center; calculating new red R′ and
blue B′
color values using linear interpolation between current red R and blue B values and green G value using respective correction ratios; andoutputting, 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 (12, 13)
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14. One or more 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; and store interpolated value in the temporary buffer; and repeat for next one or more pixels and end after last pixel. - View Dependent Claims (15, 16, 17, 18, 19, 23)
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20. One or more 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 calculating corrected values for red (R) and blue (B) color channels as follows:
R′
=R+(G−
R)×
corR;
B′
=B+(G−
B)×
corB;
where corR and corB are selected correction ratios for the red and blue color channels, respectively.- View Dependent Claims (21, 22)
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24. One or more 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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calculating vertical and horizontal gradients for each color component of at least a portion of a digital image; calculating correction ratios based on a dot product between color component gradient and vector formed by a pixel position and image center; calculating new red R′ and
blue B′
color values using linear interpolation between current red R and blue B values and green G value using respective correction ratios. - View Dependent Claims (25, 26)
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27. 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; store interpolated value in the temporary buffer; and repeat 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 (28, 29, 30, 31, 32, 36)
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33. 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 calculating corrected values for red (R) and blue (B) color channels as follows:
R′
=R+(G−
R)×
corR;
B′
=B+(G−
B)×
corB;
where corR and corB are selected correction ratios for the red and blue color channels, respectively.- View Dependent Claims (34, 35)
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37. 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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acquiring a digital image; calculating vertical and horizontal gradients for each color component; calculating correction ratios based on a dot product between color component gradient and vector formed by a pixel position and image center; calculating new red R′ and
blue B′
color values using linear interpolation between current red R and blue B values and green G value using respective correction ratios. - View Dependent Claims (38, 39)
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Specification