# US 11,442,266 B1 · Method and device for correcting chromatic aberration in multiple bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,266 B1 - Document ID: US11442266B1 - Status: Granted - Kind: B1 - Application number: 16/906,473 - Filed: 2020-06-19 - Granted: 2022-09-13 - Earliest claimed: 2019-09-09 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Zahra Sadeghipoor Kermani; Sheng Lin; Emmanuel Piuze Phaneuf; Ryan Joseph Dunn; Joachim Michael Deguara; Farhan A. Baqai - Web page: https://patentgrep.com/patent/US11442266B1 ## CPC - G02B 27/005: {for correction of secondary colour or higher-order chromatic aberrations} - G06T 5/80: Geometric correction - G06T 2207/10024: Color image - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract In one implementation, a method includes obtaining an image. The method includes splitting the image to produce a high-frequency component image and a low-frequency component image. The method includes downsampling the low-frequency component image to generate a downsampled low-frequency component image. The method includes correcting color aberration of the downsampled low-frequency component image to generate a color-corrected downsampled low-frequency component image. The method includes upsampling the color-corrected downsampled low-frequency component image to generate a color-corrected low-frequency component image. The method includes combining the color-corrected low-frequency component image and the high-frequency component image to generate a color-corrected version of the image. ## Claims ### Claim 1 A method of correcting chromatic aberration in an image, the method comprising: obtaining the image; splitting the image to produce a high-frequency component image and a low-frequency component image; downsampling the low-frequency component image to generate a downsampled low-frequency component image; correcting chromatic aberration of the downsampled low-frequency component image to generate a color-corrected downsampled low-frequency component image; upsampling the color-corrected downsampled low-frequency component image to generate a color-corrected low-frequency component image; and combining the color-corrected low-frequency component image and the high-frequency component image to generate a color-corrected version of the image. ### Claim 2 (depends on 1) The method of claim 1, further comprising correcting chromatic aberration of the color-corrected version of the image. ### Claim 3 (depends on 1) The method of claim 1, wherein obtaining the image includes: splitting a primary image to produce a high-frequency component primary image and a low-frequency component primary image; and downsampling the low-frequency component image to generate the image. ### Claim 4 (depends on 3) The method of claim 3, further comprising: upsampling the color-corrected version of the image to generate an upsampled color-corrected version of the image; and combining the upsampled color-corrected version of the image and the high-frequency component primary image to generate a color-corrected version of the primary image. ### Claim 5 (depends on 4) The method of claim 4, further comprising correcting chromatic aberration of the color-corrected version of the primary image. ### Claim 6 (depends on 1) The method of claim 1, wherein the image is a YCrCb image. ### Claim 7 (depends on 1) The method of claim 1, wherein correcting chromatic aberration of the downsampled low-frequency component image includes, for a particular pixel of the downsampled low-frequency component image: determining a likelihood that the particular pixel exhibits chromatic aberration. ### Claim 8 (depends on 7) The method of claim 7, wherein determining the likelihood that the particular pixel exhibits chromatic aberration is based on one or more chromatic characteristic values for the particular pixel. ### Claim 9 (depends on 7) The method of claim 7, wherein correcting chromatic aberration of the downsampled low-frequency component image includes, for a particular pixel of the downsampled low-frequency component image: generating a filtered version of the particular pixel by filtering the particular pixel using a neighborhood of pixels surrounding the particular pixel; and generating a color-corrected version of the particular pixel based on the likelihood that the particular pixel exhibits chromatic aberration and the filtered version of the pixel. ### Claim 10 (depends on 9) The method of claim 9, wherein correcting chromatic aberration of the downsampled low-frequency component image includes, for a particular pixel of the downsampled low-frequency component image: determining a purpleness of the particular pixel; and generating a desaturated version of the particular pixel by at least partially desaturating the particular pixel based on the purpleness of the particular pixel, wherein generating the color-corrected version of the particular pixel is further based on the desaturated version of the particular pixel. ### Claim 11 An electronic device comprising: a non-transitory memory; and one or more processors configured to: obtain an image; split the image to produce a high-frequency component image and a low-frequency component image; downsample the low-frequency component image to generate a downsampled low-frequency component image; correct chromatic aberration of the downsampled low-frequency component image to generate a color-corrected downsampled low-frequency component image; upsample the color-corrected downsampled low-frequency component image to generate a color-corrected low-frequency component image; and combine the color-corrected low-frequency component image and the high-frequency component image to generate a color-corrected version of the image. ### Claim 12 (depends on 11) The electronic device of claim 11, wherein the one or more processors are further configured to correct chromatic aberration of the color-corrected version of the image. ### Claim 13 (depends on 11) The electronic device of claim 11, wherein the one or more processors are configured to obtain the image by: splitting a primary image to produce a high-frequency component primary image and low-frequency component primary image; and downsample the low-frequency component image to generate the image. ### Claim 14 (depends on 13) The electronic device of claim 13, wherein the one or more processors are further configured to: upsample the color-corrected version of the image to generate an upsampled color-corrected version of the image; and combine the upsampled color-corrected version of the image and the high-frequency component primary image to generate a color-corrected version of the primary image. ### Claim 15 (depends on 14) The electronic device of claim 14, wherein the one or more processors are further configured to correct chromatic aberration of the color-corrected version of the primary image. ### Claim 16 (depends on 11) The electronic device of claim 11, wherein the one or more processors are configured to correct chromatic aberration of the downsampled low-frequency component image by, for a particular pixel of the downsampled low-frequency component image: determining a likelihood that the particular pixel exhibits chromatic aberration. ### Claim 17 (depends on 16) The electronic device of claim 16, wherein the one or more processors are configured to determine the likelihood that the particular pixel exhibits chromatic aberration based on one or more chromatic characteristic values for the particular pixel. ### Claim 18 (depends on 16) The electronic device of claim 16, wherein the one or more processors are configured to correct chromatic aberration of the downsampled low-frequency component image by, for a particular pixel of the downsampled low-frequency component image: generating a filtered version of the particular pixel by filtering the particular pixel using a neighborhood of pixels surrounding the particular pixel; and generating a color-corrected version of the particular pixel based on the likelihood that the particular pixel exhibits chromatic aberration and the filtered version of the pixel. ### Claim 19 (depends on 18) The electronic device of claim 18, wherein the one or more processors are configured to correct chromatic aberration of the downsampled low-frequency component image by, for a particular pixel of the downsampled low-frequency component image: determining a purpleness of the particular pixel; and generating a desaturated version of the particular pixel by at least partially desaturating the particular pixel based on the purpleness of the particular pixel, wherein generating the color-corrected version of the particular pixel is further based on the desaturated version of the particular pixel. ### Claim 20 A non-transitory computer-readable medium having instructions encoded thereon that, when executed by one or more processors of an electronic device, causes the electronic device to perform a method comprising: obtaining an image; splitting the image to produce a high-frequency component image and a low-frequency component image; downsampling the low-frequency component image to generate a downsampled low-frequency component image; correcting chromatic aberration of the downsampled low-frequency component image to generate a color-corrected downsampled low-frequency component image; upsampling the color-corrected downsampled low-frequency component image to generate a color-corrected low-frequency component image; and combining the color-corrected low-frequency component image and the high-frequency component image to generate a color-corrected version of the image.