Correction of image sensor fixed-pattern noise (FPN) due to color filter pattern
First Claim
Patent Images
1. An apparatus comprising:
- a pixel array;
a color filter array optically coupled to the pixel array, the color filter array including a plurality of tiled minimal repeating units;
processing circuitry coupled to the pixel array to correct fixed pattern noise (FPN) in an image captured by the pixel array, wherein the processing circuitry corrects values of pixels that are part of a correction group, and wherein the corrections comprise a combination of;
a color ratio correction that is based on the ratios of selected colors within each minimal repeating unit of the plurality of minimal repeating units, andone or more crosstalk corrections that are based on a chief ray angle (CRA) correction and the color ratio correction.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments of an apparatus including a pixel array and a color filter array optically coupled to the pixel array, the color filter array including a plurality of tiled minimal repeating units. Processing circuitry is coupled to the pixel array to correct fixed pattern noise (FPN) in an image captured by the pixel array. The processing circuitry corrects the values of pixels that are part of a correction group, and wherein the corrections comprise a combination of a color ratio correction that is based on the ratios of selected colors within the minimal repeating unit, and one or more crosstalk corrections that are based on a chief ray angle (CRA) correction and the color ratio correction.
-
Citations
24 Claims
-
1. An apparatus comprising:
-
a pixel array; a color filter array optically coupled to the pixel array, the color filter array including a plurality of tiled minimal repeating units; processing circuitry coupled to the pixel array to correct fixed pattern noise (FPN) in an image captured by the pixel array, wherein the processing circuitry corrects values of pixels that are part of a correction group, and wherein the corrections comprise a combination of; a color ratio correction that is based on the ratios of selected colors within each minimal repeating unit of the plurality of minimal repeating units, and one or more crosstalk corrections that are based on a chief ray angle (CRA) correction and the color ratio correction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A process comprising:
-
receiving a signal from each pixel in a pixel array optically coupled to a color filter array, the color filter array including a plurality of tiled minimal repeating units; correcting the signals of pixels that are part one or more correction groups in the pixel array to reduce or eliminate fixed pattern noise (FPN) in an image captured by the pixel array, wherein correcting the signal comprises, for each individual pixel in the array; determining a color ratio correction for the individual pixel that is based on the ratios of selected colors within each minimal repeating unit of the plurality of minimal repeating units, determining one or more crosstalk corrections for the individual pixel that are based on a chief ray angle (CRA) correction and the color ratio correction, and if the individual pixel is part of a correction group, correcting the signal from the individual pixel using a combination of the color ratio correction and the one or more crosstalk corrections. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
Specification