Efficient Image Demosaicing and Local Contrast Enhancement

摘要

An efficient demosaicing method includes reconstructing missing green pixels after estimating green-red color difference signals and green-blue color difference signals that are used in the reconstruction, and then constructing missing red and blue pixels using the color difference signals. This method creates a full resolution frame of red, green and blue pixels. The full resolution frame of pixels is sent to a display unit for display. In an efficient demosaicing process that includes local contrast enhancement, image contrast is enhanced to build and boost a brightness component from the green pixels, and to build chromatic components from all of the red, green, and blue pixels. Color difference signals are used in place of the red and blue pixels in building the chromatic components.

主权项

1. A method comprising:
receiving, by a demosaic module, a frame of pixels, where the frame was captured in a unit with a red-green-blue Bayer color filter array; generating, by the demosaic module, a plurality of color difference signals from pixels in the frame; generating adaptively, by the demosaic module, missing green pixels in the received frame of pixel to create a full resolution frame of green pixels, wherein the generating adaptively includes selecting a color difference signal in the plurality of color difference signals using a local edge estimator; transforming, by the demosaic module, a green pixel in the full resolution frame of green pixels into a brightness pixel by scaling the green pixel with a scale factor, wherein the brightness pixel is in a color space different from the red-green-blue color space; and transforming, by the demosaic module, the plurality of color difference signals into chrominance pixels in the color space different from a red-green-blue color space.