Desaturation control

Patent metadata

Field	Value
Publication number	US-10757384-B2
Application number	US-201816043487-A
Country	US
Kind code	B2
Filing date	Jul 24, 2018
Priority date	Sep 28, 2017
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

Image signal processing may include desaturation control, which may include adaptive desaturation control. Image signal processing with desaturation control may include obtaining, by an image signal processor, from an image sensor, an input image signal representing an input image, obtaining, by the image signal processor, color correction information for the input image, obtaining a color corrected image based on the input image using color correction with desaturation control such that inaccurate colorization of the color corrected image is minimized, and outputting the color corrected image.

First claim

What is claimed is:

1. A non-transitory computer-readable storage medium, comprising executable instructions that, when executed by a processor, facilitate performance of operations, comprising:
obtaining, by an image signal processor, from an image sensor, an input image signal representing an input image;
obtaining, by the image signal processor, color correction information for the input image;
obtaining a color corrected image based on the input image using color correction with desaturation control such that inaccurate colorization of the color corrected image is minimized, wherein obtaining the color corrected image includes:
obtaining a color corrected pixel based on an input pixel from the input image using color correction with desaturation control such that inaccurate colorization of the color corrected pixel is minimized;
in response to a determination that, for the input pixel, the color correction information includes a blue component correction coefficient and a red component correction coefficient that is less than one and is less than the blue component correction coefficient, desaturation control includes desaturation control proportional to the red color channel;
in response to a determination that, for the input pixel, the color correction information includes a red component correction coefficient and a blue component correction coefficient that is less than one and is less than the red component correction coefficient, desaturation control includes desaturation control proportional to the blue color channel; and
including the color corrected pixel in the color corrected image; and

outputting the color corrected image.

2. The non-transitory computer-readable storage medium of claim 1 , wherein:
obtaining the color corrected pixel based on the input pixel from the input image using color correction with desaturation control include:
obtaining a desaturation control color corrected pixel using desaturation control based on the input pixel; and
obtaining an adaptive desaturation control color corrected pixel using adaptive desaturation control based on the desaturation control color corrected pixel, such that inaccurate color brightness increase is minimized; and

including the color corrected pixel in the color corrected image includes including the adaptive desaturation control color corrected pixel in the color corrected image.

3. The non-transitory computer-readable storage medium of claim 2 , wherein obtaining the adaptive desaturation control color corrected pixel using adaptive desaturation control includes adaptive desaturation control based on a ratio between a green color channel value of the input pixel and a green color channel value of the desaturation control color corrected pixel.

4. The non-transitory computer-readable storage medium of claim 2 , wherein obtaining the adaptive desaturation control color corrected pixel using adaptive desaturation control includes obtaining the adaptive desaturation control color corrected pixel in response to a determination that, for the input pixel, the color correction information includes a blue component correction coefficient and a red component correction coefficient, wherein at least one of the blue component correction coefficient or the red component correction coefficient is less than one.

5. The non-transitory computer-readable storage medium of claim 2 , wherein obtaining the adaptive desaturation control color corrected pixel using adaptive desaturation control includes omitting obtaining the adaptive desaturation control color corrected pixel in response to a determination that, for the input pixel, the color correction information includes a blue component correction coefficient and a red component correction coefficient, wherein the blue component correction coefficient is at least one and the red component correction coefficient is at least one.

6. A method comprising:
obtaining, by an image signal processor, from an image sensor, an input image signal representing an input image;
obtaining, by the image signal processor, color correction information for the input image;

obtaining a color corrected image based on the input image using color correction with desaturation control such that inaccurate colorization of the color corrected image is minimized wherein obtaining the color corrected image includes:
obtaining a color corrected pixel based on an input pixel from the input image using color correction with desaturation control such that inaccurate colorization of the color corrected pixel is minimized;
in response to a determination that, for the input pixel, the color correction information includes a blue component correction coefficient and a red component correction coefficient that is less than one and is less than the blue component correction coefficient, desaturation control includes desaturation control proportional to the red color channel;
in response to a determination that, for the input pixel, the color correction information includes a red component correction coefficient and a blue component correction coefficient that is less than one and is less than the red component correction coefficient, desaturation control includes desaturation control proportional to the blue color channel; and
including the color corrected pixel in the color corrected image; and
outputting the color corrected image.

7. The method of claim 6 , wherein:
obtaining the color corrected pixel based on the input pixel from the input image using color correction with desaturation control include:
obtaining a desaturation control color corrected pixel using desaturation control based on the input pixel; and
obtaining an adaptive desaturation control color corrected pixel using adaptive desaturation control based on the desaturation control color corrected pixel, such that inaccurate color brightness increase is minimized; and

including the color corrected pixel in the color corrected image includes including the adaptive desaturation control color corrected pixel in the color corrected image.

8. The method of claim 7 , wherein obtaining the adaptive desaturation control color corrected pixel using adaptive desaturation control includes adaptive desaturation control based on a ratio between a green color channel value of the input pixel and a green color channel value of the desaturation control color corrected pixel.

9. The method of claim 7 , wherein obtaining the adaptive desaturation control color corrected pixel using adaptive desaturation control includes obtaining the adaptive desaturation control color corrected pixel in response to a determination that, for the input pixel, the color correction information includes a blue component correction coefficient and a red component correction coefficient, wherein at least one of the blue component correction coefficient or the red component correction coefficient is less than one.

10. The method of claim 7 , wherein obtaining the adaptive desaturation control color corrected pixel using adaptive desaturation control includes omitting obtaining the adaptive desaturation control color corrected pixel in response to a determination that, for the input pixel, the color correction information includes a blue component correction coefficient and a red component correction coefficient, wherein the blue component correction coefficient is at least one and the red component correction coefficient is at least one.

11. An apparatus comprising:
an image sensor;
an image signal processor configured to:
obtain, from the image sensor, an input image signal representing an input image;
obtain color correction information for the input image;

obtain

Assignees

• Gopro Inc

Inventors

• Douady-Pleven Bruno César
• Veit Thomas Nicolas Emmanuel
• Lebrun Marc

Classifications

• H04N25/611

  Correction of chromatic aberration · CPC title

• G06T5/50

  using two or more images, e.g. averaging or subtraction · CPC title

• G06T2207/20182

  Noise reduction or smoothing in the temporal domain; Spatio-temporal filtering · CPC title

• G06T7/90

  Determination of colour characteristics · CPC title

• G06T2207/10024

  Color image · CPC title