| CPC H04N 23/843 (2023.01) [H04N 25/704 (2023.01)] | 26 Claims |
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1. An imaging system comprising:
a phase-detection (PD) image sensor comprising a plurality of PD pixel units, each PD pixel unit comprising a first left PD pixel and a first right PD pixel, the first left PD pixel and the first right PD pixel covered by a microlens;
wherein the plurality of PD pixel units comprise green PD pixel units forming a green image, blue PD pixel units forming a blue image, and red PD pixel units forming a red image; and
wherein the green image, the blue image, and red image form a color image arranged in an original Bayer pattern comprising the green PD pixel units, the blue PD pixel units, and the red PD pixel units;
a processor configured to:
interpolate the green image to obtain a full resolution interpolated green image including defocused portions having artifacts and in-focus portions having sharp image;
low-pass filter the full resolution interpolated green image to obtain a blurred image of the full resolution interpolated green image;
combine the full resolution interpolated green image and the blurred image of the full resolution interpolated green image to obtain a corrected full resolution interpolated green image;
wherein the artifacts of the defocused portions of the full resolution interpolated green image are removed, and the sharp image of the in-focus portions of the full resolution interpolated green image is unaffected;
spatial-variant convolute the full resolution interpolated green image with a bilateral kernel, wherein the bilateral kernel is a multiplication product of a spatial kernel and a range kernel.
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