Methods and apparatuses for addressing chromatic aberrations 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, wherein the calibrating comprises;
detecting a point of a test image based on one or more characteristics of the point;
determining that the point is part of a measurement point;
measuring aberration of one or more colors at the measurement point; and
interpolating scattered data;
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; and
interpolating a displacement value; 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.
4 Assignments
0 Petitions
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.
-
Citations
18 Claims
-
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, wherein the calibrating comprises; detecting a point of a test image based on one or more characteristics of the point; determining that the point is part of a measurement point; measuring aberration of one or more colors at the measurement point; and interpolating scattered data; 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; and interpolating a displacement value; 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. 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:
-
calibrating a camera-lens pair, wherein the calibrating comprises; detecting a point of a test image based on one or more characteristics of the point; determining that the point is part of a measurement point; measuring aberration of one or more colors at the measurement point; and interpolating scattered data; 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; and interpolating a displacement value; 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 (8, 9, 10, 11, 12)
-
-
13. 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:
-
calibrating a camera-lens pair, wherein the calibrating comprises; detecting a point of a test image based on one or more characteristics of the point; determining that the point is part of a measurement point; measuring aberration of one or more colors at the measurement point; and interpolating scattered data; 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; and interpolating a displacement value; 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 (14, 15, 16, 17, 18)
-
Specification