IMAGING SYSTEMS WITH CLEAR FILTER PIXELS

摘要

An image sensor may have an array of image sensor pixels arranged in color filter unit cells each having one red image pixel that generates red image signals, one blue image pixel that generate blue image signals, and two clear image sensor pixels that generate white image signals. The image sensor may be coupled to processing circuitry that performs filtering operations on the red, blue, and white image signals to increase noise correlations in the image signals that reduce noise amplification when applying a color correction matrix to the image signals. The processing circuitry may extract a green image signal from the white image signal. The processing circuitry may compute a scaling value that includes a linear combination of the red, blue, white and green image signals. The scaling value may be applied to the red, blue, and green image signals to produce corrected image signals having improved image quality.

主权项

1. An imaging system, comprising:
an array of image sensor pixels, wherein the array of image sensor pixels includes first image sensor pixels configured to generate first image signals of a first color, second image sensor pixels configured to generate second image signals of a second color, and third image sensor pixels configured to generate third image signals of a third color; and processing circuitry, wherein the processing circuitry is configured to perform filtering operations on the first, second, and third image signals by generating a first difference value based on the first and third image signals, generating a second difference value based on the second and third image signals, applying a chroma filter to the first and second difference values to generate filtered difference values, and adding the third image signals to the filtered difference values.